1.
Three Gorges Dam
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The Three Gorges Dam is a hydroelectric dam that spans the Yangtze River by the town of Sandouping, located in Yiling District, Yichang, Hubei province, China. The Three Gorges Dam is the worlds largest power station in terms of installed capacity, in 2014 the dam generated 98.8 terawatt-hours and had the world record, but was surpassed by Itaipú Dam that set the new world record in 2016 producing 103.1 TWh. Except for the locks, the dam project was completed and fully functional as of July 4,2012, the ship lift was complete in December 2015. Each main water turbine has a capacity of 700 MW, the dam body was completed in 2006. Coupling the dams 32 main turbines with two generators to power the plant itself, the total electric generating capacity of the dam is 22,500 MW. As well as producing electricity, the dam is intended to increase the Yangtze Rivers shipping capacity, China regards the project as monumental as well as a success socially and economically, with the design of state-of-the-art large turbines, and a move toward limiting greenhouse gas emissions. However, the dam flooded archaeological and cultural sites and displaced some 1.3 million people, the dam has been controversial both domestically and abroad. A large dam across the Yangtze River was originally envisioned by Sun Yat-sen in The International Development of China and he stated that a dam capable of generating 30 million horsepower was possible downstream of the Three Gorges. In 1932, the Nationalist government, led by Chiang Kai-shek, in 1939, Japanese military forces occupied Yichang and surveyed the area. A design, the Otani plan, was completed for the dam in anticipation of a Japanese victory over China. In 1944, the United States Bureau of Reclamation chief design engineer, John L. Savage, surveyed the area, Some 54 Chinese engineers went to the U. S. for training. In the case of water craft, groups of craft would be lifted together for efficiency. Some exploration, survey, economic study, and design work was done, after the 1954 Yangtze River Floods, in 1956, Mao Zedong authored Swimming, a poem about his fascination with a dam on the Yangtze River. In 1958, after the Hundred Flowers Campaign, some engineers who spoke out against the project were imprisoned, during the 1980s, the idea of a dam reemerged. The National Peoples Congress approved the dam in 1992, out of 2,633 delegates,1,767 voted in favour,177 voted against,664 abstained, Construction started on December 14,1994. The dam was expected to be operational in 2009, but additional projects, such as the underground power plant with six additional generators. The ship lift was completed in 2015, the dam had raised the water level in the reservoir to 172.5 m above sea level by the end of 2008 and the designed maximum level of 175 m by October 2010. Made of concrete and steel, the dam is 2,335 m long, the project used 27. 2×10^6 m3 of concrete, used 463,000 T of steel, and moved about 102. 6×10^6 m3 of earth
2.
Installed capacity
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Nameplate capacity is the number registered with authorities for classifying the power output of a power station usually expressed in megawatts. Power plants with an output consistently near their nameplate capacity have a capacity factor. Actual output can be different from nameplate capacity for a number of depending on equipment. For non-dispatchable power, particularly renewable energy, nameplate capacity refers to generation under ideal conditions, output is generally limited by weather conditions, hydroelectric dam water levels, tidal variations and other outside forces. Equipment failures and maintenance usually contribute less to capacity factor reduction than the variation of the power source. In photovoltaics, capacity is rated under Standard Test Conditions usually expressed in the non-SI compliant unit watt-peak, thus there is a distinction between component capacity and facility capacity. Availability factor Declared net capacity Electricity generation Intermittent power source#Terminology List of energy storage projects
3.
Renewable energy
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Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight, wind, rain, tides, waves, and geothermal heat. Renewable energy often provides energy in four important areas, electricity generation, air and water heating/cooling, transportation, based on REN21s 2016 report, renewables contributed 19. 2% to humans global energy consumption and 23. 7% to their generation of electricity in 2014 and 2015, respectively. This energy consumption is divided as 8. 9% coming from biomass,4. 2% as heat energy,3. 9% hydro electricity and 2. 2% is electricity from wind, solar, geothermal. Worldwide investments in renewable technologies amounted to more than US$286 billion in 2015, with countries like China, globally, there are an estimated 7.7 million jobs associated with the renewable energy industries, with solar photovoltaics being the largest renewable employer. As of 2015 worldwide, more than half of all new electricity capacity installed was renewable, Renewable energy resources exist over wide geographical areas, in contrast to other energy sources, which are concentrated in a limited number of countries. Rapid deployment of energy and energy efficiency is resulting in significant energy security, climate change mitigation. In international public opinion there is strong support for promoting renewable sources such as solar power. At the national level, at least 30 nations around the already have renewable energy contributing more than 20 percent of energy supply. National renewable energy markets are projected to continue to grow strongly in the coming decade, for example, in Denmark the government decided to switch the total energy supply to 100% renewable energy by 2050. While many renewable energy projects are large-scale, renewable technologies are also suited to rural and remote areas and developing countries, United Nations Secretary-General Ban Ki-moon has said that renewable energy has the ability to lift the poorest nations to new levels of prosperity. Renewable energy systems are becoming more efficient and cheaper. Their share of energy consumption is increasing. Growth in consumption of coal and oil could end by 2020 due to increased uptake of renewables, in its various forms, it derives directly from the sun, or from heat generated deep within the earth. Included in the definition is electricity and heat generated from solar, wind, ocean, hydropower, biomass, geothermal resources, rapid deployment of renewable energy and energy efficiency, and technological diversification of energy sources, would result in significant energy security and economic benefits. New government spending, regulation and policies helped the industry weather the financial crisis better than many other sectors. As of 2011, small solar PV systems provide electricity to a few million households, United Nations Secretary-General Ban Ki-moon has said that renewable energy has the ability to lift the poorest nations to new levels of prosperity. At the national level, at least 30 nations around the already have renewable energy contributing more than 20% of energy supply. Some countries have much higher long-term policy targets of up to 100% renewables, outside Europe, a diverse group of 20 or more other countries target renewable energy shares in the 2020–2030 time frame that range from 10% to 50%
4.
Biofuel
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Biofuels can be derived directly from plants, or indirectly from agricultural, commercial, domestic, and/or industrial wastes. Renewable biofuels generally involve contemporary carbon fixation, such as those that occur in plants or microalgae through the process of photosynthesis, other renewable biofuels are made through the use or conversion of biomass. This biomass can be converted to convenient energy-containing substances in three different ways, thermal conversion, chemical conversion, and biochemical conversion and this biomass conversion can result in fuel in solid, liquid, or gas form. This new biomass can also be used directly for biofuels, bioethanol is an alcohol made by fermentation, mostly from carbohydrates produced in sugar or starch crops such as corn, sugarcane, or sweet sorghum. Cellulosic biomass, derived from sources, such as trees and grasses, is also being developed as a feedstock for ethanol production. Ethanol can be used as a fuel for vehicles in its pure form, bioethanol is widely used in the USA and in Brazil. Current plant design does not provide for converting the portion of plant raw materials to fuel components by fermentation. Biodiesel is produced from oils or fats using transesterification and is the most common biofuel in Europe, in 2010, worldwide biofuel production reached 105 billion liters, up 17% from 2009, and biofuels provided 2. 7% of the worlds fuels for road transport. Global ethanol fuel production reached 86 billion liters in 2010, with the United States and Brazil as the top producers. The worlds largest biodiesel producer is the European Union, accounting for 53% of all production in 2010. As of 2011, mandates for blending biofuels exist in 31 countries at the national level, the International Energy Agency has a goal for biofuels to meet more than a quarter of world demand for transportation fuels by 2050 to reduce dependence on petroleum and coal. The production of biofuels also led into an automotive industry. There are various social, economic, environmental and technical issues relating to production and use. Most transportation fuels are liquids, because vehicles usually require high energy density and this occurs naturally in liquids and solids. High energy density can also be provided by a combustion engine. The fuels that are easiest to burn cleanly are typically liquids, thus, liquids meet the requirements of being both energy-dense and clean-burning. In addition, liquids can be pumped, which means handling is easily mechanized, first-generation or conventional biofuels are made from sugar, starch, or vegetable oil. Biobutanol is often claimed to provide a replacement for gasoline
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Biomass
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Biomass is an industry term for getting energy by burning wood, and other organic matter. It has become popular among power stations, which switch from coal to biomass to comply with the law. Biomass most often refers to plants or plant-based materials that are not used for food or feed, as an energy source, biomass can either be used directly via combustion to produce heat, or indirectly after converting it to various forms of biofuel. Conversion of biomass to biofuel can be achieved by different methods which are classified into, thermal, chemical. Historically, humans have harnessed biomass-derived energy since the time people began burning wood to make fire. Even today, biomass is the source of fuel for domestic use in many developing countries. Biomass is all biologically-produced matter based in carbon, hydrogen and oxygen, the estimated biomass production in the world is 104.9 petagrams of carbon per year, about half in the ocean and half on land. Wood remains the largest biomass energy source today, examples include forest residues, yard clippings, wood chips, wood energy is derived by using lignocellulosic biomass as fuel. Harvested wood may be used directly as a fuel or collected from waste streams to be processed into pellet fuel or other forms of fuels. The largest source of energy from wood is pulping liquor or black liquor, in the second sense, biomass includes plant or animal matter that can be converted into fibers or other industrial chemicals, including biofuels. Based on the source of biomass, biofuels are classified broadly into two major categories, first-generation biofuels are derived from sources such as sugarcane and corn starch. Sugars present in this biomass are fermented to produce bioethanol, a fuel which can be used directly in a fuel cell to produce electricity or serve as an additive to gasoline. However, utilizing food-based resources for production only aggravates the food shortage problem. Second-generation biofuels, on the hand, utilize non-food-based biomass sources such as agriculture. These biofuels mostly consist of lignocellulosic biomass, which is not edible and is a waste for many industries. Despite being the alternative, economical production of second-generation biofuel is not yet achieved due to technological issues. These issues arise due to chemical inertness and structural rigidity of lignocellulosic biomass. Plant energy is produced by crops grown for use as fuel that offer high biomass output per hectare with low input energy
6.
Geothermal energy
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Geothermal energy is heat energy generated and stored in the Earth. Thermal energy is the energy determines the temperature of matter. The geothermal energy of the Earths crust originates from the formation of the planet. The adjective geothermal originates from the Greek roots γη, meaning earth, Earths internal heat is thermal energy generated from radioactive decay and continual heat loss from Earths formation. Temperatures at the boundary may reach over 4000 °C. Rock and water is heated in the crust, sometimes up to 370 °C, from hot springs, geothermal energy has been used for bathing since Paleolithic times and for space heating since ancient Roman times, but it is now better known for electricity generation. Worldwide,11,700 megawatts of power is online in 2013. An additional 28 gigawatts of geothermal heating capacity is installed for district heating, space heating, spas, industrial processes, desalination. Geothermal power is cost-effective, reliable, sustainable, and environmentally friendly, recent technological advances have dramatically expanded the range and size of viable resources, especially for applications such as home heating, opening a potential for widespread exploitation. Geothermal wells release greenhouse gases trapped deep within the earth, as a result, geothermal power has the potential to help mitigate global warming if widely deployed in place of fossil fuels. The Earths geothermal resources are more than adequate to supply humanitys energy needs. Drilling and exploration for resources is very expensive. Forecasts for the future of geothermal power depend on assumptions about technology, energy prices, subsidies, plate boundary movement, pilot programs like EWEBs customer opt in Green Power Program show that customers would be willing to pay a little more for a renewable energy source like geothermal. But as a result of government assisted research and industry experience, in 2001, geothermal energy costs between two and ten US cents per kWh. Hot springs have been used for bathing at least since Paleolithic times, the oldest known spa is a stone pool on Chinas Lisan mountain built in the Qin Dynasty in the 3rd century BC, at the same site where the Huaqing Chi palace was later built. In the first century AD, Romans conquered Aquae Sulis, now Bath, Somerset, England, the admission fees for these baths probably represent the first commercial use of geothermal power. The worlds oldest geothermal district heating system in Chaudes-Aigues, France, has been operating since the 14th century, the earliest industrial exploitation began in 1827 with the use of geyser steam to extract boric acid from volcanic mud in Larderello, Italy. In 1892, Americas first district heating system in Boise, Idaho was powered directly by geothermal energy, and was copied in Klamath Falls, Oregon in 1900
7.
Solar energy
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Active solar techniques include the use of photovoltaic systems, concentrated solar power and solar water heating to harness the energy. Passive solar techniques include orienting a building to the Sun, selecting materials with favorable thermal mass or light-dispersing properties, the large magnitude of solar energy available makes it a highly appealing source of electricity. The United Nations Development Programme in its 2000 World Energy Assessment found that the potential of solar energy was 1. This is several times larger than the world energy consumption. In 2011, the International Energy Agency said that the development of affordable, inexhaustible, hence the additional costs of the incentives for early deployment should be considered learning investments, they must be wisely spent and need to be widely shared. The Earth receives 174,000 terawatts of incoming solar radiation at the upper atmosphere, approximately 30% is reflected back to space while the rest is absorbed by clouds, oceans and land masses. The spectrum of light at the Earths surface is mostly spread across the visible. Most of the population live in areas with insolation levels of 150-300 watts/m². Solar radiation is absorbed by the Earths land surface, oceans – which cover about 71% of the globe –, warm air containing evaporated water from the oceans rises, causing atmospheric circulation or convection. When the air reaches an altitude, where the temperature is low, water vapor condenses into clouds. The latent heat of water condensation amplifies convection, producing atmospheric phenomena such as wind, sunlight absorbed by the oceans and land masses keeps the surface at an average temperature of 14 °C. By photosynthesis, green plants convert solar energy into stored energy, which produces food, wood. The total solar energy absorbed by Earths atmosphere, oceans and land masses is approximately 3,850,000 exajoules per year, in 2002, this was more energy in one hour than the world used in one year. Photosynthesis captures approximately 3,000 EJ per year in biomass, geography affects solar energy potential because areas that are closer to the equator have a greater amount of solar radiation. However, the use of photovoltaics that can follow the position of the sun can significantly increase the energy potential in areas that are farther from the equator. Time variation effects the potential of energy because during the nighttime there is little solar radiation on the surface of the Earth for solar panels to absorb. This limits the amount of energy that solar panels can absorb in one day, cloud cover can affect the potential of solar panels because clouds block incoming light from the sun and reduce the light available for solar cells. In addition, land availability has an effect on the available solar energy because solar panels can only be set up on land that is otherwise unused
8.
Tidal power
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Tidal power or tidal energy is a form of hydropower that converts the energy obtained from tides into useful forms of power, mainly electricity. Although not yet used, tidal power has potential for future electricity generation. Tides are more predictable than wind energy and solar power, historically, tide mills have been used both in Europe and on the Atlantic coast of North America. The incoming water was contained in large ponds, and as the tide went out. The earliest occurrences date from the Middle Ages, or even from Roman times, the process of using falling water and spinning turbines to create electricity was introduced in the U. S. and Europe in the 19th century. The worlds first large-scale tidal power plant was the Rance Tidal Power Station in France and it was the largest tidal power station in terms of output until Sihwa Lake Tidal Power Station opened in South Korea in August,2011. The Sihwa station uses sea wall defense barriers complete with 10 turbines generating 254 MW, Tidal power is taken from the Earths oceanic tides. Tidal forces are periodic variations in gravitational attraction exerted by celestial bodies and these forces create corresponding motions or currents in the worlds oceans. Due to the attraction to the oceans, a bulge in the water level is created. When the sea level is raised, water from the middle of the ocean is forced to move toward the shorelines and this occurrence takes place in an unfailing manner, due to the consistent pattern of the moon’s orbit around the earth. Tidal power is the technology that draws on energy inherent in the orbital characteristics of the Earth–Moon system. Other natural energies exploited by human technology originate directly or indirectly with the Sun, including fuel, conventional hydroelectric, wind, biofuel, wave. A tidal generator converts the energy of tidal flows into electricity, greater tidal variation and higher tidal current velocities can dramatically increase the potential of a site for tidal electricity generation. This loss of energy has caused the rotation of the Earth to slow in the 4.5 billion years since its formation. During the last 620 million years the period of rotation of the earth has increased from 21.9 hours to 24 hours, while tidal power will take additional energy from the system, the effect is negligible and would only be noticed over millions of years. Some tidal generators can be built into the structures of existing bridges or are entirely submersed, land constrictions such as straits or inlets can create high velocities at specific sites, which can be captured with the use of turbines. These turbines can be horizontal, vertical, open, or ducted, Tidal barrages make use of the potential energy in the difference in height between high and low tides. When using tidal barrages to generate power, the energy from a tide is seized through strategic placement of specialized dams
9.
Wave power
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Wave power is the transport of energy by wind waves, and the capture of that energy to do useful work – for example, electricity generation, water desalination, or the pumping of water. A machine able to exploit wave power is known as a wave energy converter. Wave power is distinct from the flux of tidal power. Wave-power generation is not currently a widely employed commercial technology, although there have been attempts to use it since at least 1890, in 2008, the first experimental wave farm was opened in Portugal, at the Aguçadoura Wave Park. Waves are generated by passing over the surface of the sea. As long as the waves propagate slower than the speed just above the waves. Wave height is determined by speed, the duration of time the wind has been blowing, fetch and by the depth. A given wind speed has a practical limit over which time or distance will not produce larger waves. When this limit has been reached the sea is said to be fully developed, in general, larger waves are more powerful but wave power is also determined by wave speed, wavelength, and water density. Oscillatory motion is highest at the surface and diminishes exponentially with depth, however, for standing waves near a reflecting coast, wave energy is also present as pressure oscillations at great depth, producing microseisms. These pressure fluctuations at greater depth are too small to be interesting from the point of view of wave power, the waves propagate on the ocean surface, and the wave energy is also transported horizontally with the group velocity. The mean transport rate of the energy through a vertical plane of unit width. The above formula states that power is proportional to the wave energy period. When the significant wave height is given in metres, and the period in seconds. Example, Consider moderate ocean swells, in water, a few km off a coastline, with a wave height of 3 m. Using the formula to solve for power, we get P ≈0.5 kW m 3 ⋅ s 2 ≈36 kW m, in major storms, the largest waves offshore are about 15 meters high and have a period of about 15 seconds. According to the formula, such waves carry about 1.7 MW of power across each metre of wavefront. An effective wave power device captures as much as possible of the energy flux
10.
Wind power
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Wind power is the use of air flow through wind turbines to mechanically power generators for electric power. The net effects on the environment are far less problematic than those of power sources. Wind farms consist of individual wind turbines which are connected to the electric power transmission network. Onshore wind is a source of electric power, competitive with or in many places cheaper than coal or gas plants. Offshore wind is steadier and stronger than on land, and offshore farms have less visual impact, small onshore wind farms can feed some energy into the grid or provide electric power to isolated off-grid locations. Wind power gives variable power which is consistent from year to year. It is therefore used in conjunction with other power sources to give a reliable supply. As the proportion of power in a region increases, a need to upgrade the grid. In addition, weather forecasting permits the power network to be readied for the predictable variations in production that occur. As of 2015, Denmark generates 40% of its power from wind. In 2014 global wind power capacity expanded 16% to 369,553 MW, yearly wind energy production is also growing rapidly and has reached around 4% of worldwide electric power usage,11. 4% in the EU. Wind power has been used as long as humans have put sails into the wind, for more than two millennia wind-powered machines have ground grain and pumped water. Wind power was available and not confined to the banks of fast-flowing streams, or later. Wind-powered pumps drained the polders of the Netherlands, and in regions such as the American mid-west or the Australian outback, wind pumps provided water for live stock. The first windmill used for the production of power was built in Scotland in July 1887 by Prof James Blyth of Andersons College. Blyth offered the surplus power to the people of Marykirk for lighting the main street, however. The Brush wind turbine had a rotor 17 metres in diameter and was mounted on an 18 metres tower, although large by todays standards, the machine was only rated at 12 kW. The connected dynamo was used either to charge a bank of batteries or to operate up to 100 incandescent light bulbs, with the development of electric power, wind power found new applications in lighting buildings remote from centrally-generated power
11.
List of renewable energy topics by country
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This is a list of renewable energy topics by country. The list refers to energy in general, as well as solar power, wind power, geothermal energy, biofuel. As of 2013, China, Germany, and Japan, three of the four largest economies, as well as India, generate more electricity from renewables than from nuclear power. Based on REN21s 2014 report, renewables contributed 19 percent to humans global energy consumption. This energy consumption is divided as 9% coming from biomass,4. 2% as heat energy,3. 8% hydro electricity and 2% is electricity from wind, solar, geothermal. China is the worlds largest producer of hydroelectricity, followed by Canada, wind power capacity is growing at the rate of 26% annually, and is widely used in Europe, Asia, and the United States. Wind power accounts for approximately 30% of electricity use in Denmark, 20% in Portugal, PV power stations are popular in Japan, China and the United States. The worlds largest geothermal power installation is The Geysers in California, brazil has one of the largest renewable energy programs in the world, involving production of ethanol fuel from sugar cane, and ethanol now provides 18 percent of the countrys automotive fuel. Ethanol fuel is widely available in the USA. Plug-in electric vehicles in Norway reached a share of 22. 4% in 2015. While many renewable energy projects are large-scale, renewable technologies are also suited to developing countries, small solar PV systems provide electricity to a few million households, and micro-hydro configured into mini-grids serves many more
12.
100% renewable energy
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Shifting the total global primary energy supply to renewable sources requires a transition of the energy system. Renewable energy use has grown faster than even advocates anticipated. The most important sector is electricity with a share of 22. 8%, most of it coming from hydropower with a share of 16. 6%. There are many places around the world with grids that are run almost exclusively on renewable energy, at the national level, at least 30 nations already have renewable energy contributing more than 20% of the energy supply. Professors S. Pacala and Robert H. Mark Z, barriers to implementing the renewable energy plan are seen to be primarily social and political, not technological or economic. Jacobson says that energy costs today with a wind, solar, the main obstacle against this scenario is the lack of political will. The main barriers to the implementation of large-scale renewable energy. Using 100% renewable energy was first suggested in a Science paper published in 1975 by Danish physicist Bent Sørensen, in 1998 the first detailed analysis of scenarios with very high shares of renewables were published. These were followed by the first detailed 100% scenarios, in 2006 a PhD thesis was published by Czisch in which it was shown that in a 100% renewable scenario energy supply could match demand in every hour of the year in Europa and North Africa. Since then Lund has been publishing several papers on 100% renewable energy, after 2009 publications began to rise steeply, covering 100% scenarios for countries in Europa, America, Australia and other parts of the world. Even in the early 21st century it was extraordinary for scientists, however, renewable energy progress has been so rapid that things have totally changed since then, Solar photovoltaic modules have dropped about 75 per cent in price. On-shore wind power is spreading over all continents and is competitive with fossil. Renewable energy use has grown faster than even advocates had anticipated. Wind turbines generate 39 percent of Danish electricity, and Denmark has many biogas digesters, together, wind and biomass provide 44% of the electricity consumed by the countrys six million inhabitants. In 2010, Portugal’s 10 million people produced more than half their electricity from renewable energy resources. Spain’s 40 million inhabitants meet one-third of their needs from renewables. Renewable energy has a history of public support. In America, for example, a 2013 Gallup survey showed that two in three Americans want the U. S. to increase energy production using solar power, wind power
13.
Renewable energy commercialization
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Renewable energy commercialization involves the deployment of three generations of renewable energy technologies dating back more than 100 years. First-generation technologies, which are mature and economically competitive, include biomass, hydroelectricity, geothermal power. As of 2012, renewable energy accounts for half of new nameplate electrical capacity installed. Public policy and political leadership helps to level the playing field, countries such as Germany, Denmark, and Spain have led the way in implementing innovative policies which has driven most of the growth over the past decade. As of 2014, Germany has a commitment to the Energiewende transition to an energy economy. There are now 144 countries with renewable energy policy targets, Renewable energy continued its rapid growth in 2015, providing multiple benefits. There was a new set for installed wind and photovoltaic capacity. A key benefit that this investment growth brings is a growth in jobs, the top countries for investment in recent years were China, Germany, Spain, the United States, Italy, and Brazil. Renewable energy companies include BrightSource Energy, First Solar, Gamesa, GE Energy, Goldwind, Sinovel, Trina Solar, Vestas, Climate change concerns are also driving increasing growth in the renewable energy industries. According to a 2011 projection by the International Energy Agency, solar power generators may produce most of the worlds electricity within 50 years, Renewable power has been more effective in creating jobs than coal or oil in the United States. Climate change, pollution, and energy insecurity are significant problems, in the old economy, energy was produced by burning something — oil, coal, or natural gas — leading to the carbon emissions that have come to define our economy. The new energy economy harnesses the energy in wind, the coming from the sun. In international public opinion there is strong support for a variety of methods for addressing the problem of energy supply. It is expected that renewable energy investments will pay off economically in the long term, EU member countries have shown support for ambitious renewable energy goals. In 2010, Eurobarometer polled the twenty-seven EU member states about the target to increase the share of energy in the EU by 20 percent by 2020. Most people in all twenty-seven countries either approved of the target or called for it to go further, across the EU,57 percent thought the proposed goal was about right and 16 percent thought it was too modest. In comparison,19 percent said it was too ambitious, New EPA initiatives targeting air toxics, coal ash, and effluent releases highlight the environmental impacts of coal and the cost of addressing them with control technologies. The use of fracking in natural gas exploration is coming under scrutiny, with evidence of groundwater contamination, concerns are increasing about the vast amounts of water used at coal-fired and nuclear power plants, particularly in regions of the country facing water shortages
14.
Saint Anthony Falls
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Saint Anthony Falls or the Falls of Saint Anthony, located northeast of downtown Minneapolis, Minnesota, was the only natural major waterfall on the Upper Mississippi River. The natural falls were replaced by an overflow spillway after it partially collapsed in 1869. Later, in the 1950s and 1960s, a series of locks, from 1880 to about 1930, Minneapolis was the Flour Milling Capital of the World. These locks were built as part of the Upper Mississippi River 9-Foot Navigation Project, the area around the falls is designated the St. Anthony Falls Historic District and features a 1. 8-mile self-guided walking trail with signs explaining the areas past. Before European exploration, the falls held cultural and political significance for native tribes who frequented the area, the falls was an important and sacred site to the Mdewakanton Dakota and they called the Mississippi River, hahawakpa, river of the falls. Dakota associated the falls with legends and spirits, including Oanktehi, god of waters and evil, the rocky islet where the woman had pointed her canoe towards doom thus was named Spirit Island which was once a nesting ground for eagles that fed on fish below the falls. Dakota also camped on Nicollet Island upstream of the falls to fish, since the cataract had to be portaged, the area became one of the natural resting and trade points along the Mississippi between Dakota and Anishinaabe peoples. The Anishinaabe term was recorded as kakabikah, Hennepin named them the Chutes de Saint-Antoine or the Falls of Saint Anthony after his patron saint, Anthony of Padua. Later explorers to document the falls include Jonathan Carver and Zebulon Montgomery Pike, by the 1860s, however, industrial waste had filled the area and marred the falls majesty. The districts archaeological record is one of the historic sites in Minnesota. The National Register of Historic Places is facilitated by the National Park Service, a Heritage Trail plaque nearby says, For untold generations of Indian people the Mississippi River was an important canoe route. To pass around the falls, the Dakota and Ojibway used a portage trail. Starting at a landing below the now occupied by the steam plant. From here it followed the east bank along what is now Main Street to a point well above the falls, geologists say that the falls first appeared roughly 10,000 years ago several miles downstream at the confluence of the glacial River Warren. Estimates are that the falls were about 180 feet high when the River Warren Falls receded past the confluence of the Mississippi River, over the succeeding 10,000 years, the falls moved upstream to its present location. The water churning at the bottom of the falls ate away at the soft sandstone, from its origins near Fort Snelling, St. Anthony Falls relocated upstream at a rate of about 4 feet per year until it reached its present location in the early 19th century. Tributaries such as Minnehaha Creek begot their own waterfalls as the Mississippi River valley was cut into the landscape, when Father Louis Hennepin documented the falls he estimated the falls height to be 50 or 60 feet. Later explorers described it as being in the range of 16 to 20 feet high, the discrepancy may have been due to scope, as the current total drop in river level over the series of dams is 76 ft
15.
United States
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Forty-eight of the fifty states and the federal district are contiguous and located in North America between Canada and Mexico. The state of Alaska is in the northwest corner of North America, bordered by Canada to the east, the state of Hawaii is an archipelago in the mid-Pacific Ocean. The U. S. territories are scattered about the Pacific Ocean, the geography, climate and wildlife of the country are extremely diverse. At 3.8 million square miles and with over 324 million people, the United States is the worlds third- or fourth-largest country by area, third-largest by land area. It is one of the worlds most ethnically diverse and multicultural nations, paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago. European colonization began in the 16th century, the United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the following the Seven Years War led to the American Revolution. On July 4,1776, during the course of the American Revolutionary War, the war ended in 1783 with recognition of the independence of the United States by Great Britain, representing the first successful war of independence against a European power. The current constitution was adopted in 1788, after the Articles of Confederation, the first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. During the second half of the 19th century, the American Civil War led to the end of slavery in the country. By the end of century, the United States extended into the Pacific Ocean. The Spanish–American War and World War I confirmed the status as a global military power. The end of the Cold War and the dissolution of the Soviet Union in 1991 left the United States as the sole superpower. The U. S. is a member of the United Nations, World Bank, International Monetary Fund, Organization of American States. The United States is a developed country, with the worlds largest economy by nominal GDP. It ranks highly in several measures of performance, including average wage, human development, per capita GDP. While the U. S. economy is considered post-industrial, characterized by the dominance of services and knowledge economy, the United States is a prominent political and cultural force internationally, and a leader in scientific research and technological innovations. In 1507, the German cartographer Martin Waldseemüller produced a map on which he named the lands of the Western Hemisphere America after the Italian explorer and cartographer Amerigo Vespucci
16.
Greek language
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Greek is an independent branch of the Indo-European family of languages, native to Greece and other parts of the Eastern Mediterranean. It has the longest documented history of any living language, spanning 34 centuries of written records and its writing system has been the Greek alphabet for the major part of its history, other systems, such as Linear B and the Cypriot syllabary, were used previously. The alphabet arose from the Phoenician script and was in turn the basis of the Latin, Cyrillic, Armenian, Coptic, Gothic and many other writing systems. Together with the Latin texts and traditions of the Roman world, during antiquity, Greek was a widely spoken lingua franca in the Mediterranean world and many places beyond. It would eventually become the official parlance of the Byzantine Empire, the language is spoken by at least 13.2 million people today in Greece, Cyprus, Italy, Albania, Turkey, and the Greek diaspora. Greek roots are used to coin new words for other languages, Greek. Greek has been spoken in the Balkan peninsula since around the 3rd millennium BC, the earliest written evidence is a Linear B clay tablet found in Messenia that dates to between 1450 and 1350 BC, making Greek the worlds oldest recorded living language. Among the Indo-European languages, its date of earliest written attestation is matched only by the now extinct Anatolian languages, the Greek language is conventionally divided into the following periods, Proto-Greek, the unrecorded but assumed last ancestor of all known varieties of Greek. The unity of Proto-Greek would have ended as Hellenic migrants entered the Greek peninsula sometime in the Neolithic era or the Bronze Age, Mycenaean Greek, the language of the Mycenaean civilisation. It is recorded in the Linear B script on tablets dating from the 15th century BC onwards, Ancient Greek, in its various dialects, the language of the Archaic and Classical periods of the ancient Greek civilisation. It was widely known throughout the Roman Empire, after the Roman conquest of Greece, an unofficial bilingualism of Greek and Latin was established in the city of Rome and Koine Greek became a first or second language in the Roman Empire. The origin of Christianity can also be traced through Koine Greek, Medieval Greek, also known as Byzantine Greek, the continuation of Koine Greek in Byzantine Greece, up to the demise of the Byzantine Empire in the 15th century. Much of the written Greek that was used as the language of the Byzantine Empire was an eclectic middle-ground variety based on the tradition of written Koine. Modern Greek, Stemming from Medieval Greek, Modern Greek usages can be traced in the Byzantine period and it is the language used by the modern Greeks, and, apart from Standard Modern Greek, there are several dialects of it. In the modern era, the Greek language entered a state of diglossia, the historical unity and continuing identity between the various stages of the Greek language is often emphasised. Greek speakers today still tend to regard literary works of ancient Greek as part of their own rather than a foreign language and it is also often stated that the historical changes have been relatively slight compared with some other languages. According to one estimation, Homeric Greek is probably closer to demotic than 12-century Middle English is to modern spoken English, Greek is spoken by about 13 million people, mainly in Greece, Albania and Cyprus, but also worldwide by the large Greek diaspora. Greek is the language of Greece, where it is spoken by almost the entire population
17.
Power (physics)
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In physics, power is the rate of doing work. It is the amount of energy consumed per unit time, having no direction, it is a scalar quantity. In the SI system, the unit of power is the joule per second, known as the watt in honour of James Watt, another common and traditional measure is horsepower. Being the rate of work, the equation for power can be written, because this integral depends on the trajectory of the point of application of the force and torque, this calculation of work is said to be path dependent. As a physical concept, power requires both a change in the universe and a specified time in which the change occurs. This is distinct from the concept of work, which is measured in terms of a net change in the state of the physical universe. The output power of a motor is the product of the torque that the motor generates. The power involved in moving a vehicle is the product of the force of the wheels. The dimension of power is divided by time. The SI unit of power is the watt, which is equal to one joule per second, other units of power include ergs per second, horsepower, metric horsepower, and foot-pounds per minute. One horsepower is equivalent to 33,000 foot-pounds per minute, or the required to lift 550 pounds by one foot in one second. Other units include dBm, a logarithmic measure with 1 milliwatt as reference, food calories per hour, Btu per hour. This shows how power is an amount of energy consumed per unit time. If ΔW is the amount of work performed during a period of time of duration Δt and it is the average amount of work done or energy converted per unit of time. The average power is simply called power when the context makes it clear. The instantaneous power is then the value of the average power as the time interval Δt approaches zero. P = lim Δ t →0 P a v g = lim Δ t →0 Δ W Δ t = d W d t. In the case of constant power P, the amount of work performed during a period of duration T is given by, W = P t
18.
Energy
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In physics, energy is the property that must be transferred to an object in order to perform work on – or to heat – the object, and can be converted in form, but not created or destroyed. The SI unit of energy is the joule, which is the transferred to an object by the mechanical work of moving it a distance of 1 metre against a force of 1 newton. Mass and energy are closely related, for example, with a sensitive enough scale, one could measure an increase in mass after heating an object. Living organisms require available energy to stay alive, such as the humans get from food. Civilisation gets the energy it needs from energy resources such as fuels, nuclear fuel. The processes of Earths climate and ecosystem are driven by the radiant energy Earth receives from the sun, the total energy of a system can be subdivided and classified in various ways. It may also be convenient to distinguish gravitational energy, thermal energy, several types of energy, electric energy. Many of these overlap, for instance, thermal energy usually consists partly of kinetic. Some types of energy are a mix of both potential and kinetic energy. An example is energy which is the sum of kinetic. Whenever physical scientists discover that a phenomenon appears to violate the law of energy conservation. Heat and work are special cases in that they are not properties of systems, in general we cannot measure how much heat or work are present in an object, but rather only how much energy is transferred among objects in certain ways during the occurrence of a given process. Heat and work are measured as positive or negative depending on which side of the transfer we view them from, the distinctions between different kinds of energy is not always clear-cut. In contrast to the definition, energeia was a qualitative philosophical concept, broad enough to include ideas such as happiness. The modern analog of this property, kinetic energy, differs from vis viva only by a factor of two, in 1807, Thomas Young was possibly the first to use the term energy instead of vis viva, in its modern sense. Gustave-Gaspard Coriolis described kinetic energy in 1829 in its modern sense, the law of conservation of energy was also first postulated in the early 19th century, and applies to any isolated system. It was argued for years whether heat was a physical substance, dubbed the caloric, or merely a physical quantity. In 1845 James Prescott Joule discovered the link between mechanical work and the generation of heat and these developments led to the theory of conservation of energy, formalized largely by William Thomson as the field of thermodynamics
19.
Watermill
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A watermill or water mill is a mill that utilizes hydropower. It is a structure that uses a wheel or water turbine to drive a mechanical process such as milling, rolling. Such processes are needed in the production of material goods, including flour, lumber, paper, textiles. Thus watermills may be comprise gristmills, sawmills, paper mills, textile mills, hammermills, trip hammering mills, rolling mills, wire drawing mills. The former type can be divided, depending on where the water hits the wheel paddles, into undershot, overshot, breastshot. Another way to water mills is by an essential trait about their location, tide mills use the movement of the tide. The earliest evidence of a wheel is probably the Perachora wheel. The earliest written reference is in the technical treatises Pneumatica and Parasceuastica of the Greek engineer Philo of Byzantium, the British historian of technology M. J. T. The sakia gear is, already developed, for the first time attested in a 2nd-century BC Hellenistic wall painting in Ptolemaic Egypt. The Greek geographer Strabon reports in his Geography a water-powered grain-mill to have existed near the palace of king Mithradates VI Eupator at Cabira, Asia Minor, before 71 BC. The Roman engineer Vitruvius has the first technical description of a watermill, dated to 40/10 BC and he also seems to indicate the existence of water-powered kneading machines. The Greek epigrammatist Antipater of Thessalonica tells of an overshot wheel mill around 20 BC/10 AD. He praised for its use in grinding grain and the reduction of human labour, Hold back your hand from the mill, you grinding girls, even if the cockcrow heralds the dawn, sleep on. If we learn to feast toil-free on the fruits of the earth, the Roman encyclopedist Pliny mentions in his Naturalis Historia of around 70 AD water-powered trip hammers operating in the greater part of Italy. There is evidence of a mill in 73/4 AD in Antioch. It is likely that a stamp mill was used at Dolaucothi to crush gold-bearing quartz. The stamps were operated as a batch of four working against a large conglomerate block, similar anvil stones have been found at other Roman mines across Europe, especially in Spain and Portugal. The 1st-century AD multiple mill complex of Barbegal in southern France has been described as the greatest known concentration of power in the ancient world
20.
Irrigation
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Irrigation is the method in which a controlled amount of water is supplied to plants at regular intervals for agriculture. It is used to assist in the growing of crops, maintenance of landscapes. Additionally, irrigation also has a few uses in crop production. In contrast, agriculture that only on direct rainfall is referred to as rain-fed or dry land farming. Irrigation systems are used for dust suppression, disposal of sewage. Irrigation is often studied together with drainage, which is the natural or artificial removal of surface and sub-surface water from a given area, Irrigation has been a central feature of agriculture for over 5,000 years and is the product of many cultures. Historically, it was the basis for economies and societies across the globe, archaeological investigation has found evidence of irrigation where the natural rainfall was insufficient to support crops for rainfed agriculture. Ancient Egyptians practiced Basin irrigation using the flooding of the Nile to inundate land plots which had surrounded by dykes. The flood water was held until the sediment had settled before the surplus was returned to the watercourse. The Ancient Nubians developed a form of irrigation by using a device called a sakia. Irrigation began in Nubia some time between the third and second millennium BCE and it largely depended upon the flood waters that would flow through the Nile River and other rivers in what is now the Sudan. In sub-Saharan Africa irrigation reached the Niger River region cultures and civilizations by the first or second millennium BCE and was based on wet season flooding, terrace irrigation is evidenced in pre-Columbian America, early Syria, India, and China. These canals are the earliest record of irrigation in the New World, traces of a canal possibly dating from the 5th millennium BCE were found under the 4th millennium canal. Large scale agriculture was practiced and a network of canals was used for the purpose of irrigation. Ancient Persia as far back as the 6th millennium BCE, where barley was grown in areas where the rainfall was insufficient to support such a crop. The Qanats, developed in ancient Persia in about 800 BCE, are among the oldest known irrigation methods still in use today and they are now found in Asia, the Middle East and North Africa. The system comprises a network of wells and gently sloping tunnels driven into the sides of cliffs. The noria, a wheel with clay pots around the rim powered by the flow of the stream, was first brought into use at about this time
21.
Gristmill
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A gristmill grinds grain into flour. The term can refer to both the mechanism and the building that holds it. The Greek geographer Strabo reports in his Geography a water-powered grain-mill to have existed near the palace of king Mithradates VI Eupator at Cabira, Asia Minor, before 71 BC. The early mills had horizontal paddle wheels, an arrangement which became known as the Norse wheel. The paddle wheel was attached to a shaft which was, in turn, the turning force produced by the water on the paddles was transferred directly to the runner stone, causing it to grind against a stationary bed, a stone of a similar size and shape. This dependence on the volume and speed of flow of the water meant that the speed of rotation of the stone was highly variable. Vertical wheels were in use in the Roman Empire by the end of the first century BC, and these were described by Vitruvius. The peak of Roman technology is probably the Barbegal aqueduct and mill where water with a 19-metre fall drove sixteen water wheels, giving a grinding capacity estimated at 2.4 to 3.2 tonnes per hour. Water mills seem to have remained in use during the post-Roman period, from this time onward, water wheels began to be used for purposes other than grist milling. In England, the number of mills in operation followed population growth, limited extant examples of gristmills can be found in Europe from the High Middle Ages. An extant well-preserved waterwheel and gristmill on the Ebro River in Spain is associated with the Real Monasterio de Nuestra Senora de Rueda, the Cistercians were known for their use of this technology in Western Europe in the period 1100 to 1350. Geared gristmills were built in the medieval Near East and North Africa. Gristmills in the Islamic world were powered by water and wind. The first wind-powered gristmills were built in the 9th and 10th centuries in what are now Afghanistan, Pakistan and Iran, early mills were almost always built and supported by farming communities and the miller received the millers toll in lieu of wages. Most towns and villages had their own mill so that farmers could easily transport their grain there to be milled. These communities were dependent on their local mill as bread was a part of the diet. Classical mill designs are usually water powered, though some are powered by the wind or by livestock, in a watermill a sluice gate is opened to allow water to flow onto, or under, a water wheel to make it turn. In most watermills the water wheel was mounted vertically, i. e. edge-on, in the water, later designs incorporated horizontal steel or cast iron turbines and these were sometimes refitted into the old wheel mills
22.
Sawmill
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A sawmill or lumber mill is a facility where logs are cut into lumber. Prior to the invention of the sawmill, boards were rived and planed, the earliest known mechanical mill is the Hierapolis sawmill, a Roman water-powered stone mill at Hierapolis, Asia Minor dating back to the 3rd century AD. Other water-powered mills followed and by the 11th century they were widespread in Spain and North Africa, the Middle East and Central Asia, the circular motion of the wheel was converted to a reciprocating motion at the saw blade. Generally, only the saw was powered, and the logs had to be loaded and moved by hand, an early improvement was the development of a movable carriage, also water powered, to move the log steadily through the saw blade. Scrap lumber from the mill provided a source of fuel for firing the boiler, the arrival of railroads meant that logs could be transported to mills rather than mills being built besides navigable waterways. Besides the sawn timber, use is made of all the by-products including sawdust, bark, wood chips, a sawmills basic operation is much like those of hundreds of years ago, a log enters on one end and dimensional lumber exits on the other end. After trees are selected for harvest, the step in logging is felling the trees. Branches are cut off the trunk, logs are taken by logging truck, rail or a log drive to the sawmill. Logs are scaled either on the way to the mill or upon arrival at the mill, debarking removes bark from the logs. Decking is the process for sorting the logs by species, size, a sawyer uses a head saw to break the log into cants and flitches. Trimming squares the ends at typical lumber lengths, drying removes naturally occurring moisture from the lumber. This can be done with kilns or air-dried, planing smooths the surface of the lumber leaving a uniform width and thickness. Shipping transports the lumber to market. The Hierapolis sawmill, a Roman water-powered stone saw mill at Hierapolis and it is also the earliest known machine to incorporate a crank and connecting rod mechanism. Water-powered stone sawmills working with cranks and connecting rods, but without gear train, are attested for the 6th century AD at the Eastern Roman cities Gerasa. The earliest literary reference to a working sawmill comes from a Roman poet, at one point in the poem he describes the shrieking sound of a watermill cutting marble. Marble sawmills also seem to be indicated by the Christian saint Gregory of Nyssa from Anatolia around 370/390 AD, sawmills became widespread in medieval Europe again, as one was sketched by Villard de Honnecourt in c. They are claimed to have introduced to Madeira following its discovery in c.1420
23.
Textile
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A textile or cloth is a flexible material consisting of a network of natural or artificial fibres. Yarn is produced by spinning raw fibres of wool, flax, cotton, hemp, Textiles are formed by weaving, knitting, crocheting, knotting, or felting. The words fabric and cloth are used in textile assembly trades as synonyms for textile, however, there are subtle differences in these terms in specialized usage. Textile refers to any material made of interlacing fibres, a fabric is a material made through weaving, knitting, spreading, crocheting, or bonding that may be used in production of further goods. Cloth may be used synonymously with fabric but is often a piece of fabric used for a specific purpose. The word textile is from Latin, from the adjective textilis, meaning woven, from textus, the word cloth derives from the Old English clað, meaning a cloth, woven or felted material to wrap around one, from Proto-Germanic kalithaz. The discovery of dyed flax fibres in a cave in the Republic of Georgia dated to 34,000 BCE suggests textile-like materials were made even in prehistoric times. The production of textiles is a craft whose speed and scale of production has been altered almost beyond recognition by industrialization, however, for the main types of textiles, plain weave, twill, or satin weave, there is little difference between the ancient and modern methods. Textiles have an assortment of uses, the most common of which are for clothing and for such as bags. In the household they are used in carpeting, upholstered furnishings, window shades, towels, coverings for tables, beds, and other flat surfaces, in the workplace they are used in industrial and scientific processes such as filtering. Textiles are used in traditional crafts such as sewing, quilting. Textiles for industrial purposes, and chosen for other than their appearance, are commonly referred to as technical textiles. Technical textiles include textile structures for applications, medical textiles, geotextiles, agrotextiles. In all these applications stringent performance requirements must be met, woven of threads coated with zinc oxide nanowires, laboratory fabric has been shown capable of self-powering nanosystems using vibrations created by everyday actions like wind or body movements. Fashion designers commonly rely on textile designs to set their fashion collections apart from others, armani, the late Gianni Versace, and Emilio Pucci can be easily recognized by their signature print driven designs. Textiles can be made from many materials and these materials come from four main sources, animal, plant, mineral, and synthetic. In the past, all textiles were made from natural fibres, including plant, animal, in the 20th century, these were supplemented by artificial fibres made from petroleum. Textiles are made in various strengths and degrees of durability, from the finest gossamer to the sturdiest canvas, microfibre refers to fibres made of strands thinner than one denier
24.
Trip hammer
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Trip hammers were usually raised by a cam and then released to fall under the force of gravity. During the Industrial Revolution the trip hammer fell out of favor and was replaced with the power hammer, often multiple hammers were powered via a set of line shafts, pulleys and belts from a centrally located power supply. In ancient China, the trip hammer evolved out of the use of the mortar and pestle, the latter was a simple device employing a lever and fulcrum, which featured a series of catches or lugs on the main revolving shaft as well. This device enabled the labor of pounding, often in the decorticating and polishing of grain, the latter book states that the legendary mythological king known as Fu Xi was the one responsible for the pestle and mortar. Afterwards the power of animals—donkeys, mules, oxen, and horses—was applied by means of machinery, with his description, it is seen that the out-of-date Chinese term for pestle and mortar would soon be replaced with the Chinese term for the water-powered trip-hammer. The Han Dynasty scholar and poet Ma Rong mentioned in one of his poems of hammers pounding in the water-echoing caves. In his Rou Xing Lun, the government official Kong Rong remarked that the invention of the hammer was an excellent example of a product created by intelligent men during his own age. There are numerous references to trip hammers during the Tang Dynasty and Song Dynasty, the recumbent hammer was found in Chinese illustrations by 1313 AD, with the publishing of Wang Zhens Nong Shu book on ancient and contemporary metallurgy in China. There were also illustrations of trip hammers in an encyclopedia of 1637, the main components for water-powered trip hammers - water wheels, cams, and hammers - were already known in Hellenistic times. Ancient cams are in evidence in early water-powered automata from the 3rd century BC and these trip-hammers were used for the pounding and hulling of grain. Apart from agricultural processing, archaeological evidence also suggests the existence of trip hammers in Roman metal working. In Ickham in Kent, a large metal hammer-head with mechanical deformations was excavated in an area where several Roman water-mills and metal waste dumps have also been traced. The widest application of trip hammers, however, seems to have occurred in Roman mining, here, the regularity and spacing of large indentations on stone anvils indicate the use of cam-operated ore stamps, much like the devices of later medieval mining. Later, Muslim engineers introduced the use of trip hammers in the production of paper, replacing the traditional Chinese mortar, water-powered and mechanised trip hammers reappeared in medieval Europe by the 12th century. Their use was described in written sources of Styria, written in 1135. Both texts mentioned the use of vertical stamp mills for ore-crushing, medieval French sources of the years 1116 and 1249 both record the use of mechanised trip hammers used in the forging of wrought iron. The well-known Renaissance artist and inventor Leonardo da Vinci often sketched trip hammers for use in forges and even file-cutting machinery, the oldest depicted European illustration of a martinet forge-hammer is perhaps the Historia de Gentibus Septentrionalibus of Olaus Magnus, dated to 1565 AD. In this woodcut image, there is the scene of three martinets and a working wood and leather bellows of the Osmund Bloomery furnace
25.
Crane (machine)
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A crane is a type of machine, generally equipped with a hoist rope, wire ropes or chains, and sheaves, that can be used both to lift and lower materials and to move them horizontally. It is mainly used for lifting heavy things and transporting them to other places, the device uses one or more simple machines to create mechanical advantage and thus move loads beyond the normal capability of a human. The first known construction cranes were invented by the Ancient Greeks and were powered by men or beasts of burden and these cranes were used for the construction of tall buildings. Larger cranes were later developed, employing the use of human treadwheels, in the High Middle Ages, harbour cranes were introduced to load and unload ships and assist with their construction – some were built into stone towers for extra strength and stability. The earliest cranes were constructed from wood, but cast iron, iron, for many centuries, power was supplied by the physical exertion of men or animals, although hoists in watermills and windmills could be driven by the harnessed natural power. The first mechanical power was provided by steam engines, the earliest steam crane being introduced in the 18th or 19th century, Cranes exist in an enormous variety of forms – each tailored to a specific use. Sizes range from the smallest jib cranes, used inside workshops, to the tallest tower cranes, mini-cranes are also used for constructing high buildings, in order to facilitate constructions by reaching tight spaces. Finally, we can find larger floating cranes, generally used to oil rigs. Some lifting machines do not strictly fit the definition of a crane. The crane for lifting heavy loads was invented by the Ancient Greeks in the late 6th century BC, the archaeological record shows that no later than c.515 BC distinctive cuttings for both lifting tongs and lewis irons begin to appear on stone blocks of Greek temples. The introduction of the winch and pulley hoist soon lead to a replacement of ramps as the main means of vertical motion. Also, the practice of erecting large monolithic columns was abandoned in favour of using several column drums. The first unequivocal evidence for the existence of the compound pulley system appears in the Mechanical Problems attributed to Aristotle. The heyday of the crane in ancient times came during the Roman Empire, the Romans adopted the Greek crane and developed it further. We are relatively well informed about their techniques, thanks to rather lengthy accounts by the engineers Vitruvius. There are also two surviving reliefs of Roman treadwheel cranes, with the Haterii tombstone from the late first century AD being particularly detailed, the simplest Roman crane, the trispastos, consisted of a single-beam jib, a winch, a rope, and a block containing three pulleys. Heavier crane types featured five pulleys or, in case of the largest one, the polyspastos, when worked by four men at both sides of the winch, could readily lift 3,000 kg. At the temple of Jupiter at Baalbek, for instance, the blocks weigh up to 60 tons each
26.
Elevator
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An elevator or lift is a type of vertical transportation that moves people or goods between floors of a building, vessel, or other structure. Elevators are generally powered by electric motors that either drive traction cables or counterweight systems like a hoist, in agriculture and manufacturing, an elevator is any type of conveyor device used to lift materials in a continuous stream into bins or silos. Several types exist, such as the chain and bucket elevator, grain auger screw conveyor using the principle of Archimedes screw, or the chain, languages other than English may have loanwords based on either elevator or lift. Because of wheelchair access laws, elevators are often a requirement in new multistory buildings. The earliest known reference to an elevator is in the works of the Roman architect Vitruvius, some sources from later historical periods mention elevators as cabs on a hemp rope powered by hand or by animals. In 1000, the Book of Secrets by al-Muradi in Islamic Spain described the use of a lifting device. In the 17th century the prototypes of elevators were located in the buildings of England. Louis XV of France had a flying chair built for one of his mistresses at the Chateau de Versailles in 1743. Ancient and medieval elevators used drive systems based on hoists or winders, the invention of a system based on the screw drive was perhaps the most important step in elevator technology since ancient times, leading to the creation of modern passenger elevators. The first screw drive elevator was built by Ivan Kulibin and installed in Winter Palace in 1793, several years later another of Kulibins elevators was installed in Arkhangelskoye near Moscow. The development of elevators was led by the need for movement of raw materials including coal, the technology developed by these industries and the introduction of steel beam construction worked together to provide the passenger and freight elevators in use today. Starting in the mines, by the mid-19th century elevators were operated with steam power and were used for moving goods in bulk in mines and factories. It elevated paying customers to a height in the center of London. Early, crude steam-driven elevators were refined in the decade, – in 1835 an innovative elevator called the Teagle was developed by the company Frost. The elevator was belt-driven and used a counterweight for extra power, the hydraulic crane was invented by Sir William Armstrong in 1846, primarily for use at the Tyneside docks for loading cargo. These quickly supplanted the steam driven elevators, exploiting Pascals law. A water pump supplied a variable level of pressure to a plunger encased inside a vertical cylinder. Counterweights and balances were used to increase the lifting power of the apparatus
27.
Ore
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An ore is a type of rock that contains sufficient minerals with important elements including metals that can be economically extracted from the rock. The ores are extracted from the earth through mining, they are refined to extract the valuable element. The grade or concentration of an ore mineral, or metal, as well as its form of occurrence, will directly affect the costs associated with mining the ore. The cost of extraction must thus be weighed against the value contained in the rock to determine what ore can be processed. Metal ores are generally oxides, sulfides, silicates, or native metals that are not commonly concentrated in the Earths crust, the ores must be processed to extract the metals of interest from the waste rock and from the ore minerals. Ore bodies are formed by a variety of geological processes, the process of ore formation is called ore genesis. An ore deposit is an accumulation of ore and this is distinct from a mineral resource as defined by the mineral resource classification criteria. An ore deposit is one occurrence of a particular ore type, Ore deposits are classified according to various criteria developed via the study of economic geology, or ore genesis. Stratiform arkose-hosted and shale-hosted copper, typified by the Zambian copperbelt and this identifies, early on, whether further investment in estimation and engineering studies is warranted and identifies key risks and areas for further work. This is because the distribution of ores is unequal and dislocated from locations of peak demand. Other, lesser, commodities do not have international clearing houses and benchmark prices and this generally makes determining the price of ores of this nature opaque and difficult. Such metals include lithium, niobium-tantalum, bismuth, antimony and rare earths, most of these commodities are also dominated by one or two major suppliers with >60% of the worlds reserves. The London Metal Exchange aims to add uranium to its list of metals on warrant, the World Bank reports that China was the top importer of ores and metals in 2005 followed by the USA and Japan. Economic geology Mineral resource classification Ore genesis Petrology Froth Flotation Extractive metallurgy DILL, the “chessboard” classification scheme of mineral deposits, Mineralogy and geology from aluminum to zirconium, Earth-Science Reviews, Volume 100, Issue 1-4, June 2010, Pages 1-420
28.
Trompe
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A trompe is a water-powered gas compressor, commonly used before the advent of the electric-powered compressor. A trompe is somewhat like an airlift pump working in reverse, trompes were used to provide compressed air for bloomery furnaces in Catalonia and the USA. The presence of a trompe is an attribute of a Catalan forge. At Canadian Hydro Developers Ragged Chute facility in New Liskeard, Ontario, water falls down a shaft 351 feet deep and 9 ft across to generate compressed air for mining equipment, water rushing down the vertical pipe falls through a constriction. The constriction produces a lower pressure because of the effect. The air forms bubbles in the pipe, as the bubbles go down the pipe they are pressurized proportionally to the hydraulic head, which is the height of the column of water in the pipe. The compressed air rises to the top of the separation chamber, the separation chamber has a compressed-air takeoff pipe, and the compressed air can be used as a power source. The energy of the falling water entrains the air into the water and that energy is solely a derivative of the hydraulic head. Large trompes were often situated at high waterfalls so that plenty of head was available, the Ragged Chute plant on the Montreal River near the town of Cobalt, Ontario, is a trompe and tourist attraction. It is now owned by Canadian Hydro and exists beside a modern hydroelectric plant, compressed air from a trompe is at the temperature of the water, and its partial pressure of water vapor is that of the dewpoint of the waters temperature. If the water is cool, the air can be made very dry by passing it through pipes that are warmer than the water. Often, ordinary outside air can warm the pipes enough to produce very dry, today, trompes constructed of plastic pipe are being used to provide aeration for mine drainage treatment. Catalan furnace Pulser pump Pneumatic motor Farga Rossell a catalan furnace in Andorra Article in Mother Earth News Ragged Chutes in Cobalt Ontario. Cobalt Mining Legacy Ragged Chutes technical details C. H. Taylor pioneer hydraulic compressor designer including Ragged Chutes in Cobalt Ontario Illustrated Book by C. H, Taylor, Taylor Hydraulic Air Compressor Trompe Catalan Furnace in San Juan Capistrano, California
29.
Electricity
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Electricity is the set of physical phenomena associated with the presence of electric charge. Although initially considered a separate to magnetism, since the development of Maxwells Equations both are recognized as part of a single phenomenon, electromagnetism. Various common phenomena are related to electricity, including lightning, static electricity, electric heating, electric discharges, in addition, electricity is at the heart of many modern technologies. The presence of a charge, which can be either positive or negative. On the other hand, the movement of charges, which is known as electric current. When a charge is placed in a location with non-zero electric field, the magnitude of this force is given by Coulombs Law. Thus, if that charge were to move, the field would be doing work on the electric charge. Electrical phenomena have been studied since antiquity, though progress in theoretical understanding remained slow until the seventeenth and eighteenth centuries. Even then, practical applications for electricity were few, and it would not be until the nineteenth century that engineers were able to put it to industrial and residential use. The rapid expansion in electrical technology at this time transformed industry, electricitys extraordinary versatility means it can be put to an almost limitless set of applications which include transport, heating, lighting, communications, and computation. Electrical power is now the backbone of modern industrial society, long before any knowledge of electricity existed, people were aware of shocks from electric fish. Ancient Egyptian texts dating from 2750 BCE referred to these fish as the Thunderer of the Nile, Electric fish were again reported millennia later by ancient Greek, Roman and Arabic naturalists and physicians. Patients suffering from such as gout or headache were directed to touch electric fish in the hope that the powerful jolt might cure them. Ancient cultures around the Mediterranean knew that certain objects, such as rods of amber, Thales was incorrect in believing the attraction was due to a magnetic effect, but later science would prove a link between magnetism and electricity. He coined the New Latin word electricus to refer to the property of attracting small objects after being rubbed and this association gave rise to the English words electric and electricity, which made their first appearance in print in Thomas Brownes Pseudodoxia Epidemica of 1646. Further work was conducted by Otto von Guericke, Robert Boyle, Stephen Gray, in the 18th century, Benjamin Franklin conducted extensive research in electricity, selling his possessions to fund his work. In June 1752 he is reputed to have attached a key to the bottom of a dampened kite string. A succession of jumping from the key to the back of his hand showed that lightning was indeed electrical in nature
30.
Cragside
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Cragside is a country house near the town of Rothbury in Northumberland, England. It was the first house in the world to be lit using hydroelectric power, the property was opened to the public in 1979. At one point, the building included an observatory and a scientific laboratory. The Grade I listed house is surrounded by one of Europes largest rock gardens, a number of rhododendrons. One variety of rhododendron is named after Lady Armstrong, Lord Armstrong spent much of his time as a child in Rothbury to get away from industrial Newcastle to alleviate his ill health. He returned to Rothbury after not having a holiday for many years, the original house was completed in 1863 by an unknown architect but was transformed by architect Richard Norman Shaw between 1869 and 1884 into an imposing mansion. Cragside is an example of his English Gothic style, in 2007, Cragside reopened after undergoing total refurbishment. In 1868, an engine was installed, with water being used to power labour-saving machines such as laundry equipment, a rotisserie. The resultant electricity was used to power an arc lamp installed in the Gallery in 1878, the arc lamp was replaced in 1880 by Joseph Swans incandescent lamps in what Swan considered the first proper installation of electric lighting. The generators, which provided power for the farm buildings on the estate, were constantly extended and improved to match the increasing electrical demand in the house. The 2006 regeneration project included extensive rewiring, a new hydro-powered electricity generator was installed in 2014, it can provide 12 kW, supplying around 10% of the propertys electricity consumption. The new system uses an Archimedes screw 17 metres long, the Open University Arts Foundation Course featured Cragside in one of its programmes in 1987. The documentary series Abroad Again in Britain by Jonathan Meades focused on Cragside in episode 2, henrietta Heald, William Armstrong, Magician of the North. Ken Smith, Emperor of Industry, Lord Armstrong of Cragside
31.
Niagara Falls
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They form the southern end of the Niagara Gorge. From largest to smallest, the three waterfalls are the Horseshoe Falls, the American Falls and the Bridal Veil Falls, the Horseshoe Falls lies on the border of the United States and Canada with the American Falls entirely on the American side, separated by Goat Island. The smaller Bridal Veil Falls are also on the American side, the international boundary line was originally drawn through Horseshoe Falls in 1819, but the boundary has long been in dispute due to natural erosion and construction. Located on the Niagara River, which drains Lake Erie into Lake Ontario, Horseshoe Falls is the most powerful waterfall in North America, as measured by vertical height and flow rate. The falls are 17 miles north-northwest of Buffalo, New York, while not exceptionally high, the Niagara Falls are very wide. More than six cubic feet of water falls over the crest line every minute in high flow. The Niagara Falls are famed both for their beauty and as a source of hydroelectric power. Balancing recreational, commercial, and industrial uses has been a challenge for the stewards of the falls since the 19th century. The Horseshoe Falls drop about 188 feet, while the height of the American Falls varies between 70 and 100 feet because of the presence of giant boulders at its base. The larger Horseshoe Falls are about 2,600 feet wide, the distance between the American extremity of the Niagara Falls and the Canadian extremity is 3,409 feet. The volume of water approaching the falls during peak season may sometimes be as much as 225,000 cubic feet per second. The average annual rate is 85,000 cubic feet per second. Since the flow is a function of the Lake Erie water elevation. This is accomplished by employing a weir – the International Control Dam – with movable gates upstream from the Horseshoe Falls. The falls flow is further halved at night, and, during the low tourist season in the winter, water diversion is regulated by the 1950 Niagara Treaty and is administered by the International Niagara Board of Control. The current rate of erosion is approximately 1 foot per year and it is estimated that 50,000 years from now, even at this reduced rate of erosion, the remaining 20 miles to Lake Erie will have been undermined and the falls will cease to exist. The features that became Niagara Falls were created by the Wisconsin glaciation about 10,000 years ago, the same forces also created the North American Great Lakes and the Niagara River. All were dug by an ice sheet that drove through the area, deepening some river channels to form lakes
32.
Hydroelectricity
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Hydroelectricity is electricity produced from hydropower. In 2015 hydropower generated 16. 6% of the total electricity and 70% of all renewable electricity. Hydropower is produced in 150 countries, with the Asia-Pacific region generating 33 percent of global hydropower in 2013, China is the largest hydroelectricity producer, with 920 TWh of production in 2013, representing 16.9 percent of domestic electricity use. The cost of hydroelectricity is relatively low, making it a source of renewable electricity. The hydro station consumes no water, unlike coal or gas plants, the average cost of electricity from a hydro station larger than 10 megawatts is 3 to 5 U. S. cents per kilowatt-hour. With a dam and reservoir it is also a source of electricity since the amount produced by the station can be changed up or down very quickly to adapt to changing energy demands. Once a hydroelectric complex is constructed, the project produces no direct waste, Hydropower has been used since ancient times to grind flour and perform other tasks. In the mid-1770s, French engineer Bernard Forest de Bélidor published Architecture Hydraulique which described vertical-, by the late 19th century, the electrical generator was developed and could now be coupled with hydraulics. The growing demand for the Industrial Revolution would drive development as well, in 1878 the worlds first hydroelectric power scheme was developed at Cragside in Northumberland, England by William George Armstrong. It was used to power an arc lamp in his art gallery. The old Schoelkopf Power Station No.1 near Niagara Falls in the U. S. side began to produce electricity in 1881. The first Edison hydroelectric power station, the Vulcan Street Plant, began operating September 30,1882, in Appleton, Wisconsin, by 1886 there were 45 hydroelectric power stations in the U. S. and Canada. By 1889 there were 200 in the U. S. alone, at the beginning of the 20th century, many small hydroelectric power stations were being constructed by commercial companies in mountains near metropolitan areas. Grenoble, France held the International Exhibition of Hydropower and Tourism with over one million visitors, by 1920 as 40% of the power produced in the United States was hydroelectric, the Federal Power Act was enacted into law. The Act created the Federal Power Commission to regulate hydroelectric power stations on federal land, as the power stations became larger, their associated dams developed additional purposes to include flood control, irrigation and navigation. Federal funding became necessary for development and federally owned corporations, such as the Tennessee Valley Authority. Hydroelectric power stations continued to become larger throughout the 20th century, Hydropower was referred to as white coal for its power and plenty. Hoover Dams initial 1,345 MW power station was the worlds largest hydroelectric station in 1936
33.
World Bank
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The World Bank is an international financial institution that provides loans to countries of the world for capital programs. It comprises two institutions, the International Bank for Reconstruction and Development, and the International Development Association, the World Bank is a component of the World Bank Group, which is part of the United Nations system. The World Banks stated official goal is the reduction of poverty, the president of the World Bank is, traditionally, an American. The World Bank and the IMF are both based in Washington, D. C. and work closely with each other, although many countries were represented at the Bretton Woods Conference, the United States and United Kingdom were the most powerful in attendance and dominated the negotiations. Before 1974 the reconstruction and development loans provided by the World Bank were relatively small, the Banks staff were aware of the need to instill confidence in the bank. Fiscal conservatism ruled, and loan applications had to meet strict criteria, the first country to receive a World Bank loan was France. The Banks president at the time, John McCloy, chose France over two other applicants, Poland and Chile, the loan was for US$250 million, half the amount requested, and it came with strict conditions. France had to agree to produce a budget and give priority of debt repayment to the World Bank over other governments. World Bank staff closely monitored the use of the funds to ensure that the French government met the conditions. In addition, before the loan was approved, the United States State Department told the French government that its members associated with the Communist Party would first have to be removed, the French government complied with this diktat and removed the Communist coalition government - the so-called tripartisme. Within hours, the loan to France was approved, when the Marshall Plan went into effect in 1947, many European countries began receiving aid from other sources. Faced with this competition, the World Bank shifted its focus to non-European countries, in 1960, the International Development Association was formed, providing soft loans to developing countries. From 1974 to 1980 the bank concentrated on meeting the needs of people in the developing world. The size and number of loans to borrowers was greatly increased as loan targets expanded from infrastructure into social services and these changes can be attributed to Robert McNamara, who was appointed to the presidency in 1968 by Lyndon B. Johnson. McNamara implored bank treasurer Eugene Rotberg to seek out new sources of capital outside of the banks that had been the primary sources of funding. Rotberg used the bond market to increase the capital available to the bank. One consequence of the period of poverty alleviation lending was the rise of third world debt. From 1976 to 1980 developing world debt rose at an annual rate of 20%
34.
Economic development
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Economic development is the process by which a nation improves the economic, political, and social well-being of its people. The term has been used frequently by economists, politicians, and others in the 20th, the concept, however, has been in existence in the West for centuries. Modernization, Westernization, and especially Industrialization are other people have used while discussing economic development. Economic development has a relationship with the environment and environmental issues. Whereas economic development is a policy intervention endeavor with aims of economic and social well-being of people, economic growth is a phenomenon of market productivity, consequently, as economist Amartya Sen points out, economic growth is one aspect of the process of economic development. The scope of development includes the process and policies by which a nation improves the economic, political. The University of Iowas Center for International Finance and Development states that, Economic development is a term that economists, politicians, the concept, however, has been in existence in the West for centuries. Modernization, Westernisation, and especially Industrialisation are other people have used while discussing economic development. Economic development has a relationship with the environment. Although nobody is certain when the concept originated, some agree that development is closely bound up with the evolution of capitalism. Economic development can also be considered as a theory that documents the state of an economy at a certain time. According to Schumpeter and Backhaus, the changes in equilibrium state to document in economic theory can only be caused by intervening factors coming from the outside. Economic development originated in the period of reconstruction initiated by the United States. Their food is inadequate, they are victims of disease and their economic life is primitive and stagnant. Their poverty is a handicap and a both to them and to more prosperous areas. For the first time in history humanity possesses the knowledge and the skill to relieve the suffering of these people, greater production is the key to prosperity and peace. And the key to production is a wider and more vigorous application of modem scientific. There have been several phases of development theory since 1945
35.
Dam
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A dam is a barrier that impounds water or underground streams. Reservoirs created by not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture. Hydropower is often used in conjunction with dams to generate electricity, a dam can also be used to collect water or for storage of water which can be evenly distributed between locations. Dams generally serve the purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. The word dam can be traced back to Middle English, and before that, from Middle Dutch, the first known appearance of dam occurs in 1165. However, there is one village, Obdam, that is mentioned in 1120. The word seems to be related to the Greek word taphos, so the word should be understood as dike from dug out earth. The names of more than 40 places from the Middle Dutch era such as Amsterdam and Rotterdam, early dam building took place in Mesopotamia and the Middle East. Dams were used to control the level, for Mesopotamias weather affected the Tigris. The earliest known dam is the Jawa Dam in Jordan,100 kilometres northeast of the capital Amman and this gravity dam featured an originally 9-metre-high and 1 m-wide stone wall, supported by a 50 m-wide earth rampart. The structure is dated to 3000 BC, the Ancient Egyptian Sadd-el-Kafara Dam at Wadi Al-Garawi, located about 25 km south of Cairo, was 102 m long at its base and 87 m wide. The structure was built around 2800 or 2600 BC as a dam for flood control. During the Twelfth Dynasty in the 19th century BC, the Pharaohs Senosert III, Amenemhat III, two dams called Ha-Uar running east-west were built to retain water during the annual flood and then release it to surrounding lands. The lake called Mer-wer or Lake Moeris covered 1,700 km2 and is today as Berkat Qaroun. One of the wonders of the ancient world was the Great Dam of Marib in Yemen. Repairs were carried out during various periods, most important around 750 BC and these extensive works were not actually finalized until 325 AD and allowed the irrigation of 25,000 acres. By the mid-late 3rd century BC, an intricate water-management system within Dholavira in modern-day India was built, the system included 16 reservoirs, dams and various channels for collecting water and storing it. Eflatun Pınar is a Hittite dam and spring temple near Konya and it is thought to be from the time of the Hittite empire between the 15th and 13th century BC
36.
Social impact assessment
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Social impact assessment is a methodology to review the social effects of infrastructure projects and other development interventions. Although SIA is usually applied to planned interventions, the techniques can be used to evaluate the social impact of unplanned events, for example disasters, demographic change. The origins of SIA largely derive from the impact assessment model. In the United States under the National Environmental Policy Act, social impact assessments are federally mandated and performed in conjunction with environmental impact assessments, null show Definitions for social impact assessment vary by different sectors and applications. Its primary purpose is to bring about a more sustainable and equitable biophysical, SIA overlaps with monitoring and evaluation. In all these sectors, there is a case for conducting SIA, the Hydropower Sustainability Assessment Protocol is a sector specific method for checking the quality of environmental and social assessments and management plans. Non-experts and local people should participate in the design and implementation of proposed developments or programmes and this can be achieved in the process of doing an SIA, through adopting a participatory and democratic research process. Some SIAs go further than this, to adopt an advocacy role, for example, several SIAs carried out in Queensland, Australia, have been conducted by consultants working for local Aboriginal communities who oppose new mining projects on ancestral land. The International Handbook of Social Impact Assessment, Social Impact Assessment, Method and Experience in Europe, North America and the developing world. London, UCL Press Burdge, Rabel J.2004, the concepts, process and methods of SIA. Middleton, WI, The Social Ecology Press, a Community Guide to Social Impact Assessment. Middleton, WI, The Social Ecology Press ISBN 0-941042-17-0, state of the art in social impact measurement, methods for work integration social enterprises measuring their impact in a public context, 5th EMES Conference Franks, Daniel M.2011. Management of the Social Impacts of Mining, in Peter Darling, SME Mining Engineering Handbook Third ed. Littleton, Colorado, USA, Society for Mining, Metallurgy, Social impact assessment of resource projects. Mining for Development, Guide to Australian Practice, International Mining for Development Centre, Australian Government, University of Queensland, Franks, D. M. and F Vanclay 2013. Social Impact Management Plans, Innovation in corporate and public policy, Environmental Impact Assessment Review,43, hanna, P. & Vanclay, F.2013. Human rights, Indigenous peoples and the concept of Free, Prior and Informed Consent, Impact Assessment & Project Appraisal,31, local and non-specialist participation in impact assessment, in, C. -Q. Liu, Z. Zhao, T. Xiao and J. Guha, Strategic Management of Environmental and Socio-Economic Issues, guiyang, China, Guizhou Science and Technology Publishing House, 27-36 Howitt, R.2001
37.
Environmental impact assessment
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Environmental assessment is the assessment of the environmental consequences of a plan, policy, program, or concrete projects prior to the decision to move forward with the proposed action. Environmental assessments may be governed by rules of administrative procedure regarding public participation and documentation of decision making, the purpose of the assessment is to ensure that decision makers consider the environmental impacts when deciding whether or not to proceed with a project. Environmental impact assessments commenced in the 1960s, as part of increasing environmental awareness, EIAs involved a technical evaluation intended to contribute to more objective decision making. In the United States, environmental impact assessments obtained formal status in 1969, EIAs have been used increasingly around the world. The number of Environmental Assessments filed every year has vastly overtaken the number of more rigorous Environmental Impact Statements, an Environmental Assessment is a mini-EIS designed to provide sufficient information to allow the agency to decide whether the preparation of a full-blown Environmental Impact Statement is necessary. EIA is an activity that is done to find out the impact that would be done before development will occur and these EIAs consider activities related to extraction of raw materials, ancillary materials, equipment, production, use, disposal and ancillary equipment. Genetically modified plants - Specific methods available to perform EIAs of genetically modified organisms include GMP-RAM, fuzzy logic - EIA methods need measurement data to estimate values of impact indicators. However, many of the environment impacts cannot be quantified, e. g. landscape quality, lifestyle quality, instead information from similar EIAs, expert judgment and community sentiment are employed. Approximate reasoning methods known as fuzzy logic can be used, a fuzzy arithmetic approach has also been proposed and implemented using a software tool. At the end of the project, an audit evaluates the accuracy of the EIA by comparing actual to predicted impacts, the objective is to make future EIAs more valid and effective. The Hydropower Sustainability Assessment Protocol is a specific method for checking the quality of Environmental and Social assessments. The history of EIA in Australia could be linked to the enactment of the U. S. National Environment Policy Act in 1970, which made the preparation of environmental impact statements a requirement. In Australia, one might say that the EIA procedures were introduced at a State Level prior to that of the Commonwealth, with a majority of the states having divergent views to the Commonwealth. One of the states was New South Wales, whose State Pollution Control Commission issued EIA guidelines in 1974. At a Commonwealth level, this was followed by passing of the Environment Protection Act in 1974, the Environment Protection and Biodiversity Conservation Act 1999 superseded the Environment Protection Act 1974 and is the current central piece for EIA in Australia on a Commonwealth level. Overlap between federal and state requirements is addressed via bilateral agreements or one off accreditation of state processes, in addition to this, the EPBC Act aims at providing a streamlined national assessment and approval process for activities. The Department of Environment, Water, Heritage and the Arts assess the process and this is primarily due to the division of powers between the States and the Federal government and due to which the Australian Government environment minister cannot overturn a state decision. There are strict civil and criminal penalties for the breach of EPBC Act, EIA provisions within Ministerial Authorities in the ACT are found in the Chapters 7 and 8 of the Planning and Development Act 2007
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History of India
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Evidence of anatomically modern humans in the Indian subcontinent is recorded as long as 75,000 years ago, or with earlier hominids including Homo erectus from about 500,000 years ago. A sophisticated and technologically advanced urban culture developed in the Mature Harappan period and this civilisation collapsed at the start of the second millennium BCE and was later followed by the Iron Age Vedic Civilisation. The era saw the composition of the Vedas, the texts of Hinduism. The Vedic Civilisation extended over much of the Indo-Gangetic plain and witnessed the rise of major polities known as the Mahajanapadas, in one of these kingdoms, Magadha, Gautama Buddha and Mahavira propagated their Shramanic philosophies during the fifth and sixth century BCE. Most of the subcontinent was conquered by the Maurya Empire during the 4th, from the 3rd century BCE onwards Prakrit and Pali literature in the north and the Tamil Sangam literature in southern India started to flourish. Wootz steel originated in south India in the 3rd century BCE and was exported to foreign countries, various parts of India were ruled by numerous dynasties for the next 1,500 years, among which the Gupta Empire stands out. This period, witnessing a Hindu religious and intellectual resurgence, is known as the classical or Golden Age of India, Indian cultural influence spread over many parts of Southeast Asia which led to the establishment of Indianised kingdoms in Southeast Asia. Southern India saw the rise of imperial powers from the middle of the fifth century, most notable being the Chalukya, Chola, Pallava, Chera, Pandyan. The Chola dynasty conquered southern India and successfully invaded parts of Southeast Asia, Sri Lanka, Maldives, the early medieval period Indian mathematics influenced the development of mathematics and astronomy in the Arab world and the Hindu numerals were introduced. The 15th century saw the emergence of Sikhism, in the 16th century, Mughals came from Central Asia and gradually covered most of India. From the late 18th century to the century, large areas of India were annexed by the British East India Company of the British Empire. James Mill, in his The History of British India, distinguished three phases in the history of India, namely Hindu, Muslim and British civilisations and this periodisation has been influential, but has also been criticised for the misconceptions it gave rise to. Another influential periodisation is the division into ancient, classical, medieval and modern periods, according to Thapar, a periodisation could also be based on significant social and economic changes, which are not strictly related to a change of ruling powers. Tools crafted by proto-humans that have dated back two million years have been discovered in the northwestern part of the subcontinent. The ancient history of the region some of South Asias oldest settlements. The earliest archaeological site in the subcontinent is the Palaeolithic hominid site in the Soan River valley, soanian sites are found in the Sivalik region across what are now India, Pakistan, and Nepal. The first confirmed semi-permanent settlements appeared 9,000 years ago in the Bhimbetka rock shelters in modern Madhya Pradesh, early Neolithic culture in the Indian subcontinent is represented by the Bhirrana findings in Haryana, India as well as Mehrgarh findings in Balochistan, Pakistan. The Edakkal Caves are pictorial writings believed to date to at least 6,000 BCE, from the Neolithic man, the Stone Age carvings of Edakkal are rare and are the only known examples from South India
39.
Water wheel
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A water wheel is a machine for converting the energy of flowing or falling water into useful forms of power, often in a watermill. A water wheel consists of a wheel, with a number of blades or buckets arranged on the outside rim forming the driving surface. Most commonly, the wheel is mounted vertically on a horizontal axle, vertical wheels can transmit power either through the axle or via a ring gear and typically drive belts or gears, horizontal wheels usually directly drive their load. Water wheels were still in use well into the 20th century. Uses included milling flour in gristmills, grinding wood into pulp for papermaking, hammering wrought iron, machining, some water wheels are fed by water from a mill pond, which is formed when a flowing stream is dammed. A channel for the water flowing to or from a wheel is called a mill race. The race bringing water from the pond to the water wheel is a headrace. In the mid to late 18th century John Smeatons scientific investigation of the water led to significant increases in efficiency supplying much needed power for the Industrial Revolution. Water wheels began being displaced by the smaller, less expensive and more efficient turbine, developed by Benoît Fourneyron, turbines are capable of handling high heads, or elevations, that exceed the capability of practical-sized waterwheels. The main difficulty of water wheels is their dependence on flowing water, modern hydroelectric dams can be viewed as the descendants of the water wheel, as they too take advantage of the movement of water downhill. The two main functions of water wheels were historically water-lifting for irrigation purposes and as a power source, when used for water-lifting power can be supplied by either human or animal force or by the water current itself. Water wheels come in two designs, either a vertical or a horizontal axle. The latter type can be subdivided, depending on where the hits the wheel. Engineers of the Hellenistic era Mediterranean region are credited with the development of the water wheel, Mediterranean engineers of the Hellenistic and Roman periods were also the first to use it for both irrigation and as a power source. The technological breakthrough occurred in the advanced and scientifically minded Hellenistic period between the 3rd and 1st centuries BCE. This is seen as an evolution of the paddle-driven water-lifting wheels that had appeared in ancient Egypt by the 4th century BCE. According to John Peter Oleson, both the wheel and the hydraulic Noria appeared in Egypt by the 4th century BCE. This is supported by finds at Faiyum, where the oldest archeological evidence of a water-wheel has been found
40.
Roman Empire
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Civil wars and executions continued, culminating in the victory of Octavian, Caesars adopted son, over Mark Antony and Cleopatra at the Battle of Actium in 31 BC and the annexation of Egypt. Octavians power was then unassailable and in 27 BC the Roman Senate formally granted him overarching power, the imperial period of Rome lasted approximately 1,500 years compared to the 500 years of the Republican era. The first two centuries of the empires existence were a period of unprecedented political stability and prosperity known as the Pax Romana, following Octavians victory, the size of the empire was dramatically increased. After the assassination of Caligula in 41, the senate briefly considered restoring the republic, under Claudius, the empire invaded Britannia, its first major expansion since Augustus. Vespasian emerged triumphant in 69, establishing the Flavian dynasty, before being succeeded by his son Titus and his short reign was followed by the long reign of his brother Domitian, who was eventually assassinated. The senate then appointed the first of the Five Good Emperors, the empire reached its greatest extent under Trajan, the second in this line. A period of increasing trouble and decline began with the reign of Commodus, Commodus assassination in 192 triggered the Year of the Five Emperors, of which Septimius Severus emerged victorious. The assassination of Alexander Severus in 235 led to the Crisis of the Third Century in which 26 men were declared emperor by the Roman Senate over a time span. It was not until the reign of Diocletian that the empire was fully stabilized with the introduction of the Tetrarchy, which saw four emperors rule the empire at once. This arrangement was unsuccessful, leading to a civil war that was finally ended by Constantine I. Constantine subsequently shifted the capital to Byzantium, which was renamed Constantinople in his honour and it remained the capital of the east until its demise. Constantine also adopted Christianity which later became the state religion of the empire. However, Augustulus was never recognized by his Eastern colleague, and separate rule in the Western part of the empire ceased to exist upon the death of Julius Nepos. The Eastern Roman Empire endured for another millennium, eventually falling to the Ottoman Turks in 1453, the Roman Empire was among the most powerful economic, cultural, political and military forces in the world of its time. It was one of the largest empires in world history, at its height under Trajan, it covered 5 million square kilometres. It held sway over an estimated 70 million people, at that time 21% of the entire population. Throughout the European medieval period, attempts were made to establish successors to the Roman Empire, including the Empire of Romania, a Crusader state. Rome had begun expanding shortly after the founding of the republic in the 6th century BC, then, it was an empire long before it had an emperor
41.
Han dynasty
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The Han dynasty was the second imperial dynasty of China, preceded by the Qin dynasty and succeeded by the Three Kingdoms period. Spanning over four centuries, the Han period is considered an age in Chinese history. To this day, Chinas majority ethnic group refers to itself as the Han people and it was founded by the rebel leader Liu Bang, known posthumously as Emperor Gaozu of Han, and briefly interrupted by the Xin dynasty of the former regent Wang Mang. This interregnum separates the Han dynasty into two periods, the Western Han or Former Han and the Eastern Han or Later Han, the emperor was at the pinnacle of Han society. He presided over the Han government but shared power with both the nobility and appointed ministers who came largely from the gentry class. The Han Empire was divided into areas controlled by the central government using an innovation inherited from the Qin known as commanderies. These kingdoms gradually lost all vestiges of their independence, particularly following the Rebellion of the Seven States, from the reign of Emperor Wu onward, the Chinese court officially sponsored Confucianism in education and court politics, synthesized with the cosmology of later scholars such as Dong Zhongshu. This policy endured until the fall of the Qing dynasty in 1911 AD, the Han dynasty was an age of economic prosperity and saw a significant growth of the money economy first established during the Zhou dynasty. The coinage issued by the government mint in 119 BC remained the standard coinage of China until the Tang dynasty. The period saw a number of limited institutional innovations, the Xiongnu, a nomadic steppe confederation, defeated the Han in 200 BC and forced the Han to submit as a de facto inferior partner, but continued their raids on the Han borders. Emperor Wu of Han launched several campaigns against them. The ultimate Han victory in these wars eventually forced the Xiongnu to accept vassal status as Han tributaries, the territories north of Hans borders were quickly overrun by the nomadic Xianbei confederation. Imperial authority was seriously challenged by large Daoist religious societies which instigated the Yellow Turban Rebellion. When Cao Pi, King of Wei, usurped the throne from Emperor Xian, following Liu Bangs victory in the Chu–Han Contention, the resulting Han dynasty was named after the Hanzhong fief. Chinas first imperial dynasty was the Qin dynasty, the Qin unified the Chinese Warring States by conquest, but their empire became unstable after the death of the first emperor Qin Shi Huangdi. Within four years, the authority had collapsed in the face of rebellion. Although Xiang Yu proved to be a commander, Liu Bang defeated him at Battle of Gaixia. Liu Bang assumed the title emperor at the urging of his followers and is known posthumously as Emperor Gaozu, Changan was chosen as the new capital of the reunified empire under Han
42.
China
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China, officially the Peoples Republic of China, is a unitary sovereign state in East Asia and the worlds most populous country, with a population of over 1.381 billion. The state is governed by the Communist Party of China and its capital is Beijing, the countrys major urban areas include Shanghai, Guangzhou, Beijing, Chongqing, Shenzhen, Tianjin and Hong Kong. China is a power and a major regional power within Asia. Chinas landscape is vast and diverse, ranging from forest steppes, the Himalaya, Karakoram, Pamir and Tian Shan mountain ranges separate China from much of South and Central Asia. The Yangtze and Yellow Rivers, the third and sixth longest in the world, respectively, Chinas coastline along the Pacific Ocean is 14,500 kilometers long and is bounded by the Bohai, Yellow, East China and South China seas. China emerged as one of the worlds earliest civilizations in the basin of the Yellow River in the North China Plain. For millennia, Chinas political system was based on hereditary monarchies known as dynasties, in 1912, the Republic of China replaced the last dynasty and ruled the Chinese mainland until 1949, when it was defeated by the communist Peoples Liberation Army in the Chinese Civil War. The Communist Party established the Peoples Republic of China in Beijing on 1 October 1949, both the ROC and PRC continue to claim to be the legitimate government of all China, though the latter has more recognition in the world and controls more territory. China had the largest economy in the world for much of the last two years, during which it has seen cycles of prosperity and decline. Since the introduction of reforms in 1978, China has become one of the worlds fastest-growing major economies. As of 2016, it is the worlds second-largest economy by nominal GDP, China is also the worlds largest exporter and second-largest importer of goods. China is a nuclear weapons state and has the worlds largest standing army. The PRC is a member of the United Nations, as it replaced the ROC as a permanent member of the U. N. Security Council in 1971. China is also a member of numerous formal and informal multilateral organizations, including the WTO, APEC, BRICS, the Shanghai Cooperation Organization, the BCIM, the English name China is first attested in Richard Edens 1555 translation of the 1516 journal of the Portuguese explorer Duarte Barbosa. The demonym, that is, the name for the people, Portuguese China is thought to derive from Persian Chīn, and perhaps ultimately from Sanskrit Cīna. Cīna was first used in early Hindu scripture, including the Mahābhārata, there are, however, other suggestions for the derivation of China. The official name of the state is the Peoples Republic of China. The shorter form is China Zhōngguó, from zhōng and guó and it was then applied to the area around Luoyi during the Eastern Zhou and then to Chinas Central Plain before being used as an occasional synonym for the state under the Qing
43.
Hushing
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Hushing is an ancient and historic mining method using a flood or torrent of water to reveal mineral veins. The method was applied in ways, both in prospecting for ores, and for their exploitation. Mineral veins are often hidden below soil and sub-soil, which must be stripped away to discover the ore veins, a flood of water is very effective in moving soil as well as working the ore deposits when combined with other methods such as fire-setting. Hushing was used during the formation and expansion of the Roman Empire from the 1st century BC on to the end of the empire and it was also widely used later, and apparently survived until modern times where the cost of explosives was prohibitive. It was widely used in the United States, where it was known as booming, a variant known as hydraulic mining where jets or streams of water are used to break down deposits, especially of alluvial gold and alluvial tin, is commonly used. The method is described by Pliny the Elder in Book XXXIII of his Naturalis Historia from the 1st century AD. He distinguishes the use of the method for prospecting for ore and it was used during the Roman period for hydraulic mining of alluvial gold deposits, and in opencast vein mining, for removal of rock debris, created by mechanical attack and fire-setting. The power behind a large release of water is great, especially if it forms a single water wave. Such a wave could be created by a sluice gate covering one end of the reservoir, the size of the tank controlled the height of the wave and its volume. Hushing was most effective when used on steep ground such as the brow of a hill or mountain, the rate of attack would be controlled by the water supply, and perhaps more difficult the higher the deposit to be cleared. If veins of ore were found using the method, then hushing could also remove the debris created when attacking the veins. Pliny also describes the way hillsides could be undermined, and then collapsed to release the ore-bearing material, the development of the mine at Dolaucothi shows the versatility of the method in finding and then exploiting ore deposits. There are the remains of tanks and reservoirs still to be seen at the site. It was a tank built for prospection on the north side of the isolated opencast north of the main mine. It was presumably built to prospect the ground to one side of the opencast for traces of the gold-bearing veins extending to the north and it failed to find the veins here, so was abandoned. It probably precedes the construction of the 7 mile long aqueduct supplying the main site, the method could be applied to any ore type, and succeeded best in hilly terrain. The Romans were well experienced in building the long aqueducts needed to supply the large volumes of water needed by the method, and construction was probably directed by army engineers. He describes the gold miners had with a local tribe because of the great volumes of water they had taken from the local river, reducing it to a trickle
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Dolaucothi Gold Mines
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The Dolaucothi Gold Mines, also known as the Ogofau Gold Mine, are ancient Roman surface and underground mines located in the valley of the River Cothi, near Pumsaint, Carmarthenshire, Wales. The gold mines are located within the Dolaucothi Estate which is now owned by the National Trust and they are the only mines for Welsh gold outside those of the Dolgellau gold-belt, and are a Scheduled Ancient Monument. They are also the only known Roman gold mines in Britain, although it does not exclude the likelihood that they exploited other known sources in Devon, North Wales, Scotland, the site is important for showing advanced Roman technology. Sextus Julius Frontinus was sent into Roman Britain in 74 AD to succeed Quintus Petillius Cerialis as governor of that island, during his tenure, he probably established the fort at Pumsaint in west Wales, largely to exploit the gold deposits at Dolaucothi. Frontinus later restored the Aqueducts of Rome and wrote the treatise on 1st century Roman aqueducts. That gold occurred here is shown by the discovery of a hoard of gold ornaments in the 18th century, objects found included a wheel brooch and snake bracelets, so named because they were soft enough to be coiled around the arm for display. All the objects are now held in the British Museum, a sample of gold ore was found at the site by Henry de la Beche in 1844, confirming the presence of gold. Evidence from the fortification and its settlement show that the Roman army occupied the fort during the 1st. However, coarse ware and Samian ware pottery recovered from a reservoir within the complex show that activity at the mines continued until the late 3rd century at least. Since Ptolemys map dates to about 150 AD, it is likely that it continued being worked until the end of the 3rd century if not beyond, the larger aqueduct from the Cothi crosses this opencast, proving the opencast to be earlier. The water was stored in the tanks and then released suddenly, pliny the Elder gives a dramatic account in his Naturalis Historia of the method, possibly derived from his experiences in Spain. The method is known as hushing and survived in use until the 19th century in Britain, a not dissimilar method is used today in exploiting alluvial tin deposits, and is known as hydraulic mining. The water supply of the aqueducts was used for washing crushed gold ore. One of the first aqueducts was built at a level on the east slope of Allt Cwmhenog. There is a tank at its end, where it sweeps around the brow of the hill onto the west side of the ridge. A gold vein must have been discovered here, because there is a large opencast below the tank, yet the larger and longer aqueduct taps the river Cothi about 7 miles to the north-east and traverses the same opencast, so must be later in date. By contrast, several found on the site did not show a vein. The tank shown at right occurs not far from the north opencast and was intended to find the limits of the deposit located in the adjacent opencast
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Wales
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Wales is a country that is part of the United Kingdom and the island of Great Britain. It is bordered by England to the east, the Irish Sea to the north and west, and it had a population in 2011 of 3,063,456 and has a total area of 20,779 km2. Wales has over 1,680 miles of coastline and is mountainous, with its higher peaks in the north and central areas, including Snowdon. The country lies within the temperate zone and has a changeable. Welsh national identity emerged among the Celtic Britons after the Roman withdrawal from Britain in the 5th century, Llywelyn ap Gruffudds death in 1282 marked the completion of Edward I of Englands conquest of Wales, though Owain Glyndŵr briefly restored independence to Wales in the early 15th century. The whole of Wales was annexed by England and incorporated within the English legal system under the Laws in Wales Acts 1535–1542, distinctive Welsh politics developed in the 19th century. Welsh Liberalism, exemplified in the early 20th century by Lloyd George, was displaced by the growth of socialism, Welsh national feeling grew over the century, Plaid Cymru was formed in 1925 and the Welsh Language Society in 1962. Established under the Government of Wales Act 1998, the National Assembly for Wales holds responsibility for a range of devolved policy matters, two-thirds of the population live in south Wales, mainly in and around Cardiff, Swansea and Newport, and in the nearby valleys. Now that the countrys traditional extractive and heavy industries have gone or are in decline, Wales economy depends on the sector, light and service industries. Wales 2010 gross value added was £45.5 billion, over 560,000 Welsh language speakers live in Wales, and the language is spoken by a majority of the population in parts of the north and west. From the late 19th century onwards, Wales acquired its popular image as the land of song, Rugby union is seen as a symbol of Welsh identity and an expression of national consciousness. The Old English-speaking Anglo-Saxons came to use the term Wælisc when referring to the Celtic Britons in particular, the modern names for some Continental European lands and peoples have a similar etymology. The modern Welsh name for themselves is Cymry, and Cymru is the Welsh name for Wales and these words are descended from the Brythonic word combrogi, meaning fellow-countrymen. The use of the word Cymry as a self-designation derives from the location in the post-Roman Era of the Welsh people in modern Wales as well as in northern England and southern Scotland. It emphasised that the Welsh in modern Wales and in the Hen Ogledd were one people, in particular, the term was not applied to the Cornish or the Breton peoples, who are of similar heritage, culture, and language to the Welsh. The word came into use as a self-description probably before the 7th century and it is attested in a praise poem to Cadwallon ap Cadfan c. 633. Thereafter Cymry prevailed as a reference to the Welsh, until c.1560 the word was spelt Kymry or Cymry, regardless of whether it referred to the people or their homeland. The Latinised forms of names, Cambrian, Cambric and Cambria, survive as lesser-used alternative names for Wales, Welsh
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Spain
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By population, Spain is the sixth largest in Europe and the fifth in the European Union. Spains capital and largest city is Madrid, other urban areas include Barcelona, Valencia, Seville, Bilbao. Modern humans first arrived in the Iberian Peninsula around 35,000 years ago, in the Middle Ages, the area was conquered by Germanic tribes and later by the Moors. Spain is a democracy organised in the form of a government under a constitutional monarchy. It is a power and a major developed country with the worlds fourteenth largest economy by nominal GDP. Jesús Luis Cunchillos argues that the root of the span is the Phoenician word spy. Therefore, i-spn-ya would mean the land where metals are forged, two 15th-century Spanish Jewish scholars, Don Isaac Abravanel and Solomon ibn Verga, gave an explanation now considered folkloric. Both men wrote in two different published works that the first Jews to reach Spain were brought by ship by Phiros who was confederate with the king of Babylon when he laid siege to Jerusalem. This man was a Grecian by birth, but who had given a kingdom in Spain. He became related by marriage to Espan, the nephew of king Heracles, Heracles later renounced his throne in preference for his native Greece, leaving his kingdom to his nephew, Espan, from whom the country of España took its name. Based upon their testimonies, this eponym would have already been in use in Spain by c.350 BCE, Iberia enters written records as a land populated largely by the Iberians, Basques and Celts. Early on its coastal areas were settled by Phoenicians who founded Western Europe´s most ancient cities Cadiz, Phoenician influence expanded as much of the Peninsula was eventually incorporated into the Carthaginian Empire, becoming a major theater of the Punic Wars against the expanding Roman Empire. After an arduous conquest, the peninsula came fully under Roman Rule, during the early Middle Ages it came under Germanic rule but later, much of it was conquered by Moorish invaders from North Africa. In a process took centuries, the small Christian kingdoms in the north gradually regained control of the peninsula. The last Moorish kingdom fell in the same year Columbus reached the Americas, a global empire began which saw Spain become the strongest kingdom in Europe, the leading world power for a century and a half, and the largest overseas empire for three centuries. Continued wars and other problems led to a diminished status. The Napoleonic invasions of Spain led to chaos, triggering independence movements that tore apart most of the empire, eventually democracy was peacefully restored in the form of a parliamentary constitutional monarchy. Spain joined the European Union, experiencing a renaissance and steady economic growth
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Great Britain
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Great Britain, also known as Britain, is a large island in the north Atlantic Ocean off the northwest coast of continental Europe. With an area of 209,331 km2, Great Britain is the largest European island, in 2011 the island had a population of about 61 million people, making it the worlds third-most populous island after Java in Indonesia and Honshu in Japan. The island of Ireland is situated to the west of it, the island is dominated by a maritime climate with quite narrow temperature differences between seasons. Politically, the island is part of the United Kingdom of Great Britain and Northern Ireland, most of England, Scotland, and Wales are on the island. The term Great Britain often extends to surrounding islands that form part of England, Scotland, and Wales. A single Kingdom of Great Britain resulted from the union of the Kingdom of England, the archipelago has been referred to by a single name for over 2000 years, the term British Isles derives from terms used by classical geographers to describe this island group. By 50 BC Greek geographers were using equivalents of Prettanikē as a name for the British Isles. However, with the Roman conquest of Britain the Latin term Britannia was used for the island of Great Britain, the oldest mention of terms related to Great Britain was by Aristotle, or possibly by Pseudo-Aristotle, in his text On the Universe, Vol. III. To quote his works, There are two large islands in it, called the British Isles, Albion and Ierne. The name Britain descends from the Latin name for Britain, Britannia or Brittānia, Old French Bretaigne and Middle English Bretayne, Breteyne. The French form replaced the Old English Breoton, Breoten, Bryten, Breten, Britannia was used by the Romans from the 1st century BC for the British Isles taken together. It is derived from the writings of the Pytheas around 320 BC. Marcian of Heraclea, in his Periplus maris exteri, described the group as αἱ Πρεττανικαὶ νῆσοι. The peoples of these islands of Prettanike were called the Πρεττανοί, Priteni is the source of the Welsh language term Prydain, Britain, which has the same source as the Goidelic term Cruithne used to refer to the early Brythonic-speaking inhabitants of Ireland. The latter were later called Picts or Caledonians by the Romans, the Greco-Egyptian scientist Ptolemy referred to the larger island as great Britain and to Ireland as little Britain in his work Almagest. The name Albion appears to have out of use sometime after the Roman conquest of Britain. After the Anglo-Saxon period, Britain was used as a term only. It was used again in 1604, when King James VI and I styled himself King of Great Brittaine, France, Great Britain refers geographically to the island of Great Britain, politically to England, Scotland and Wales in combination
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Middle Ages
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In the history of Europe, the Middle Ages or Medieval Period lasted from the 5th to the 15th century. It began with the fall of the Western Roman Empire and merged into the Renaissance, the Middle Ages is the middle period of the three traditional divisions of Western history, classical antiquity, the medieval period, and the modern period. The medieval period is subdivided into the Early, High. Population decline, counterurbanisation, invasion, and movement of peoples, the large-scale movements of the Migration Period, including various Germanic peoples, formed new kingdoms in what remained of the Western Roman Empire. In the seventh century, North Africa and the Middle East—once part of the Byzantine Empire—came under the rule of the Umayyad Caliphate, although there were substantial changes in society and political structures, the break with classical antiquity was not complete. The still-sizeable Byzantine Empire survived in the east and remained a major power, the empires law code, the Corpus Juris Civilis or Code of Justinian, was rediscovered in Northern Italy in 1070 and became widely admired later in the Middle Ages. In the West, most kingdoms incorporated the few extant Roman institutions, monasteries were founded as campaigns to Christianise pagan Europe continued. The Franks, under the Carolingian dynasty, briefly established the Carolingian Empire during the later 8th, the Crusades, first preached in 1095, were military attempts by Western European Christians to regain control of the Holy Land from Muslims. Kings became the heads of centralised nation states, reducing crime and violence, intellectual life was marked by scholasticism, a philosophy that emphasised joining faith to reason, and by the founding of universities. Controversy, heresy, and the Western Schism within the Catholic Church paralleled the conflict, civil strife. Cultural and technological developments transformed European society, concluding the Late Middle Ages, the Middle Ages is one of the three major periods in the most enduring scheme for analysing European history, classical civilisation, or Antiquity, the Middle Ages, and the Modern Period. Medieval writers divided history into periods such as the Six Ages or the Four Empires, when referring to their own times, they spoke of them as being modern. In the 1330s, the humanist and poet Petrarch referred to pre-Christian times as antiqua, leonardo Bruni was the first historian to use tripartite periodisation in his History of the Florentine People. Bruni and later argued that Italy had recovered since Petrarchs time. The Middle Ages first appears in Latin in 1469 as media tempestas or middle season, in early usage, there were many variants, including medium aevum, or middle age, first recorded in 1604, and media saecula, or middle ages, first recorded in 1625. The alternative term medieval derives from medium aevum, tripartite periodisation became standard after the German 17th-century historian Christoph Cellarius divided history into three periods, Ancient, Medieval, and Modern. The most commonly given starting point for the Middle Ages is 476, for Europe as a whole,1500 is often considered to be the end of the Middle Ages, but there is no universally agreed upon end date. English historians often use the Battle of Bosworth Field in 1485 to mark the end of the period
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Lead
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Lead is a chemical element with atomic number 82 and symbol Pb. When freshly cut, it is bluish-white, it tarnishes to a dull gray upon exposure to air and it is a soft, malleable, and heavy metal with a density exceeding that of most common materials. Lead has the second-highest atomic number of the stable elements. Lead is a relatively unreactive post-transition metal and its weak metallic character is illustrated by its amphoteric nature and tendency to form covalent bonds. Compounds of lead are found in the +2 oxidation state. Exceptions are mostly limited to organolead compounds, like the lighter members of the group, lead exhibits a tendency to bond to itself, it can form chains, rings, and polyhedral structures. Lead is easily extracted from its ores and was known to people in Western Asia. A principal ore of lead, galena, often bears silver, Lead production declined after the fall of Rome and did not reach comparable levels again until the Industrial Revolution. Nowadays, global production of lead is about ten million tonnes annually, Lead has several properties that make it useful, high density, low melting point, ductility, and relative inertness to oxidation. In the late 19th century, lead was recognized as poisonous, Lead is a neurotoxin that accumulates in soft tissues and bones, damaging the nervous system and causing brain disorders and, in mammals, blood disorders. A lead atom has 82 electrons, arranged in a configuration of 4f145d106s26p2. The combined first and second ionization energies—the total energy required to remove the two 6p electrons—is close to that of tin, leads upper neighbor in group 14. This is unusual since ionization energies generally fall going down a group as an elements outer electrons become more distant from the nucleus, the similarity is caused by the lanthanide contraction—the decrease in element radii from lanthanum to lutetium, and the relatively small radii of the elements after hafnium. The contraction is due to shielding of the nucleus by the lanthanide 4f electrons. The combined first four ionization energies of lead exceed those of tin, for this reason lead, unlike tin, mostly forms compounds in which it has an oxidation state of +2, rather than +4. Relativistic effects, which become particularly prominent at the bottom of the periodic table, as a result, the 6s electrons of lead become reluctant to participate in bonding, a phenomenon called the inert pair effect. A related outcome is that the distance between nearest atoms in crystalline lead is unusually long, the lighter group 14 elements form stable or metastable allotropes having the tetrahedrally coordinated and covalently bonded diamond cubic structure. The energy levels of their outer s- and p-orbitals are close enough to allow mixing into four hybrid sp3 orbitals
50.
Tin
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Tin is a chemical element with symbol Sn and atomic number 50. It is a metal in group 14 of the periodic table. It is obtained chiefly from the mineral cassiterite, which contains tin dioxide, Tin shows a chemical similarity to both of its neighbors in group 14, germanium and lead, and has two main oxidation states, +2 and the slightly more stable +4. Tin is the 49th most abundant element and has, with 10 stable isotopes, metallic tin is not easily oxidized in air. The first alloy used on a scale was bronze, made of tin and copper. After 600 BC, pure metallic tin was produced, pewter, which is an alloy of 85–90% tin with the remainder commonly consisting of copper, antimony, and lead, was used for flatware from the Bronze Age until the 20th century. In modern times, tin is used in alloys, most notably tin/lead soft solders. Another large application for tin is corrosion-resistant tin plating of steel, inorganic tin compounds are rather non-toxic. Because of its low toxicity, tin-plated metal was used for packaging as tin cans. However, overexposure to tin may cause problems with metabolizing essential trace elements such as copper and zinc, Tin is a soft, malleable, ductile and highly crystalline silvery-white metal. When a bar of tin is bent, a sound known as the tin cry can be heard from the twinning of the crystals. Tin melts at the low temperature of about 232 °C, the lowest in group 14, the melting point is further lowered to 177.3 °C for 11 nm particles. β-tin, which is stable at and above room temperature, is malleable, in contrast, α-tin, which is stable below 13.2 °C, is brittle. α-tin has a cubic crystal structure, similar to diamond. α-tin has no properties at all because its atoms form a covalent structure in which electrons cannot move freely. It is a dull-gray powdery material with no common uses other than a few specialized semiconductor applications and these two allotropes, α-tin and β-tin, are more commonly known as gray tin and white tin, respectively. Two more allotropes, γ and σ, exist at temperatures above 161 °C, in cold conditions, β-tin tends to transform spontaneously into α-tin, a phenomenon known as tin pest. Commercial grades of tin resist transformation because of the effect of the small amounts of bismuth, antimony, lead
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