1.
Pacer (train)
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Pacer is the operational name of the British Rail Classes 140,141,142,143 and 144 diesel multiple unit railbuses, built between 1980 and 1987. Intended as a solution to a shortage of rolling stock. The Rail Vehicle Accessibility Regulations require that all passenger trains must be accessible to disabled people by 2020. Only one Pacer currently meets this requirement, and the remainder will therefore need to be withdrawn by that date unless they receive an extensive refurbishment, the Pacers use a modified bus body with a reinforced cab area, in order to comply with crashworthiness standards. Each carriage has four wheels on a fixed long-wheelbase, rather than the usual arrangement of eight wheels attached to bogies. This arrangement has been criticised for causing loud noise and excessive wear to the wheels, the Pacer series was a project by British Rail to create a train, with low running costs, for use on rural and suburban rail services. At the time, BR was under increasing pressure from the government including proposals to cut more rail lines. BR set a challenge to several companies to design a cheap, since then,165 Pacer trains have been built, with some over 30 years old by 2015. Demonstrator units have toured the U. S, Northern Ireland, Belgium, Sweden, Thailand, Malaysia and Indonesia, without producing sales. However Iran purchased redundant Class 141 units for use on lines around Tehran. The Pacer series was the result of an experiment to see whether the possibility of using bus parts to create a multiple unit was viable. This was followed by the prototype class 140, which was built in 1980 at the British Rail Engineering Derby works. The prototype was joined by another 20 two-car units which formed the Class 141 fleet, the units were used mainly in Yorkshire, operating on predominantly suburban services. They had a capacity of 94 passengers per two-car set, the entire class underwent a technical upgrade in 1988 at the Hunslet-Barclay works in Kilmarnock. The units were withdrawn from use in 1997, many were sold to the Islamic Republic of Iran Railways but have been withdrawn and are left rotting away in disused sidings in Iran, whilst a few remain in preservation. Because it used a standard Leyland National body, the Class 141 was narrower than the later Pacers, the later Pacers had widened body panels to allow an increase in seating. The next and largest Pacer class was the Class 142 and this again was built by Leyland and BREL, in 1985. The body was based on a Leyland National bus, built at Lillyhall, many fixtures and fittings of the Leyland National could be found on the units
2.
Scaffolding
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Bamboo scaffolding is a type of scaffolding made from bamboo and widely used in construction work for centuries. Many famous landmarks, notably The Great Wall of China, were built using bamboo scaffolding and it was first introduced into the building industry in Hong Kong immediately after colonization in the 1800s. It was widely used in the building of houses and multi-story buildings prior to the development of metal scaffolding and it was also useful for short-term construction projects, such as framework for temporary sheds for Cantonese Opera performances. There is three types of scaffolding in Hong Kong,1, in 2013, there were 1,751 registered bamboo scaffolders and roughly 200 scaffolding companies in Hong Kong. The use of scaffolding is diminishing due to shortages in labor. Despite the lack of force and material, recently the safety problem has become another serious concern. The labor shortage may be due to the reluctance of younger generations to become scaffolders, “They even think that it’s a dirty and dangerous job. “They refuse to step in, although we give them high pay. Young generations do not like jobs that involve hard work. ”Another reason fewer people are becoming scaffolders is that new recruits need to undergo training with the Hong Kong Construction Industry Council in order to acquire a license. Older scaffolders generally learned in apprenticeships, and may have been able to gather more hands-on experience, material shortages are also a contributing factor to the decline. The bamboo scaffolding material was imported from mainland China, bamboo—which matures after three years to the wide diameter and thick skin perfect for scaffolding—came from the Shaoxing area in Guangdong. Over the past two decades, firms have had to look to Guangxi instead, the industrys fear is that one day supplies will be blocked due to export embargoes and environmental concerns. Attempts to import bamboo from Thailand, or switch to synthetic or plastic bamboo, have so far proved unsuccessful, in many African countries, notably Nigeria, bamboo scaffolding is still used in small scale construction in urban areas. In rural areas, the use of scaffolding for construction is common. Some of the structures in relaxation and recreation centres both in urban and rural areas of Nigeria are put in place using bamboo materials and this is not for reasons of poverty but to add more aesthetics to these centres. Bamboo materials are used in the construction of some bukas in rural areas. Content about specifications Double-row Scaffold Only double-row bamboo scaffold is allowed to use for working at height, nylon Mesh The perimeter of bamboo scaffold shall be covered by nylon mesh against falling objects. The lapping of nylon mesh should be at least 100mm wide, access and Egress Suitable means of access shall be provided from the building or ground level to the scaffold such as gangway, stairs and ladder etc
3.
Piston pump
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A piston pump is a type of positive displacement pump where the high-pressure seal reciprocates with the piston. Piston pumps can be used to move liquids or compress gases, the first piston pump was invented by Ctesibius The two main types of piston pump are the lift pump and the force pump. Both types may be operated either by hand or by an engine, in a lift pump, the upstroke of the piston draws water, through a valve, into the lower part of the cylinder. On the downstroke, water passes through valves set in the piston into the part of the cylinder. On the next upstroke, water is discharged from the part of the cylinder via a spout. In a force pump, the upstroke of the piston draws water, through an inlet valve, on the downstroke, the water is discharged, through an outlet valve, into the outlet pipe. Axial piston pump Radial piston pump Plunger pump Diaphragm pump
4.
Oil well
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An oil well is a boring in the Earth that is designed to bring petroleum oil hydrocarbons to the surface. Usually some natural gas is produced along with the oil, a well that is designed to produce mainly or only gas may be termed a gas well. The earliest known oil wells were drilled in China in 347 CE and these wells had depths of up to about 240 metres and were drilled using bits attached to bamboo poles. The oil was burned to evaporate brine and produce salt, by the 10th century, extensive bamboo pipelines connected oil wells with salt springs. The ancient records of China and Japan are said to contain allusions to the use of natural gas for lighting and heating. Petroleum was known as Burning water in Japan in the 7th century, arab and Persian chemists also distilled crude oil in order to produce flammable products for military purposes. Through Islamic Spain, distillation became available in Western Europe by the 12th century, some sources claim that from the 9th century, oil fields were exploited in the area around modern Baku, Azerbaijan, to produce naphtha for the petroleum industry. These places were described by Marco Polo in the 13th century, when Marco Polo in 1264 visited Baku, on the shores of the Caspian Sea, he saw oil being collected from seeps. He wrote that on the confines toward Geirgine there is a fountain from which oil springs in great abundance, in 1846, Baku the first ever well was drilled with percussion tools to a depth of 21 meters for oil exploration. In 1848, the first modern oil well was drilled on the Aspheron Peninsula north-east of Baku, the earliest oil wells in modern times were drilled percussively, by repeatedly raising and dropping a cable tool into the earth. In the 20th century, cable tools were replaced with rotary drilling. The record-depth Kola Borehole used non-rotary mud motor drilling to achieve a depth of over 12,000 metres, until the 1970s, most oil wells were vertical, although lithological and mechanical imperfections cause most wells to deviate at least slightly from true vertical. However, modern directional drilling technologies allow for strongly deviated wells which can, given sufficient depth and with the proper tools, before a well is drilled, a geologic target is identified by a geologist or geophysicist to meet the objectives of the well. For a production well, the target is picked to optimize production from the well, for an exploration or appraisal well, the target is chosen to confirm the existence of a viable hydrocarbon reservoir or to ascertain its extent. The target will be matched with a location, and a trajectory between the two will be designed. When the well path is identified, a team of geoscientists and these properties include pore pressure, fracture gradient, wellbore stability, porosity, permeability, lithology, faults, and clay content. The well is created by drilling a hole 12 cm to 1 meter in diameter into the earth with a rig that rotates a drill string with a bit attached. After the hole is drilled, sections of pipe, slightly smaller in diameter than the borehole, are placed in the hole
5.
Oil field
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An oil field or oilfield is a region with an abundance of oil wells extracting petroleum from below ground. Because the oil reservoirs typically extend over an area, possibly several hundred kilometres across. In addition, there may be exploratory wells probing the edges, pipelines to transport the oil elsewhere, because an oil field may be remote from civilization, establishing a field is often an extremely complicated exercise in logistics. This goes beyond requirements for drilling, to include associated infrastructure, for instance, workers require housing to allow them to work onsite for months or years. In turn, housing and equipment require electricity and water, in cold regions, pipelines may need to be heated. Also, excess gas may be burned off if there is no way to make use of it—which requires a furnace, chimney. More than 40,000 oil fields are scattered around the globe, on land, the largest are the Ghawar Field in Saudi Arabia and the Burgan Field in Kuwait, with more than 60 billion barrels estimated in each. Most oil fields are much smaller, according to the US Department of Energy, as of 2003 the US alone had over 30,000 oil fields. In the modern age, the location of oil fields with oil reserves is a key underlying factor in many geopolitical conflicts. The term oilfield is also used as a shorthand to refer to the petroleum industry. However, it is accurate to divide the oil industry into three sectors, upstream, midstream and downstream. Oil Fields from Space - nighttime satellite images showing fields around the world
6.
Emulsion
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An emulsion is a mixture of two or more liquids that are normally immiscible. Emulsions are part of a general class of two-phase systems of matter called colloids. Although the terms colloid and emulsion are sometimes used interchangeably, emulsion should be used when both phases, dispersed and continuous, are liquids, in an emulsion, one liquid is dispersed in the other. Examples of emulsions include vinaigrettes, homogenized milk, mayonnaise, the word emulsion comes from the Latin word for to milk, as milk is an emulsion of fat and water, along with other components. Two liquids can form different types of emulsions, as an example, oil and water can form, first, an oil-in-water emulsion, wherein the oil is the dispersed phase, and water is the dispersion medium. Second, they can form an emulsion, wherein water is the dispersed phase. Multiple emulsions are also possible, including a water-in-oil-in-water emulsion and an oil-in-water-in-oil emulsion, emulsions, being liquids, do not exhibit a static internal structure. The droplets dispersed in the matrix are usually assumed to be statistically distributed. The term emulsion is used to refer to the photo-sensitive side of photographic film. Such a photographic emulsion consist of silver halide colloidal particles dispersed in a gelatin matrix, nuclear emulsions are similar to photographic emulsions, except that they are used in particle physics to detect high-energy elementary particles. Emulsions contain both a dispersed and a phase, with the boundary between the phases called the interface. Emulsions tend to have an appearance because the many phase interfaces scatter light as it passes through the emulsion. Emulsions appear white when all light is scattered equally, if the emulsion is dilute enough, higher-frequency and low-wavelength light will be scattered more, and the emulsion will appear bluer – this is called the Tyndall effect. If the emulsion is concentrated enough, the color will be distorted toward comparatively longer wavelengths and this phenomenon is easily observable when comparing skimmed milk, which contains little fat, to cream, which contains a much higher concentration of milk fat. One example would be a mixture of water and oil, two special classes of emulsions – microemulsions and nanoemulsions, with droplet sizes below 100 nm – appear translucent. This property is due to the fact that lightwaves are scattered by the only if their sizes exceed about one-quarter of the wavelength of the incident light. Due to their similarity in appearance, translucent nanoemulsions and microemulsions are frequently confused, the required surfactant concentration in a microemulsion is, however, several times higher than that in a translucent nanoemulsion, and significantly exceeds the concentration of the dispersed phase. Because of many undesirable side-effects caused by surfactants, their presence is disadvantageous or prohibitive in many applications, in addition, the stability of a microemulsion is often easily compromised by dilution, by heating, or by changing pH levels
7.
Petroleum
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Petroleum is a naturally occurring, yellow-to-black liquid found in geological formations beneath the Earths surface, which is commonly refined into various types of fuels. Components of petroleum are separated using a technique called fractional distillation and it consists of hydrocarbons of various molecular weights and other organic compounds. The name petroleum covers both naturally occurring unprocessed crude oil and petroleum products that are made up of refined crude oil. A fossil fuel, petroleum is formed when large quantities of dead organisms, usually zooplankton and algae, are buried underneath sedimentary rock, Petroleum has mostly been recovered by oil drilling. Drilling is carried out studies of structural geology, sedimentary basin analysis. Petroleum is used in manufacturing a variety of materials. Concern over the depletion of the earths finite reserves of oil, the burning of fossil fuels plays the major role in the current episode of global warming. The word petroleum comes from Greek, πέτρα for rocks and Greek, the term was found in 10th-century Old English sources. It was used in the treatise De Natura Fossilium, published in 1546 by the German mineralogist Georg Bauer, Petroleum, in one form or another, has been used since ancient times, and is now important across society, including in economy, politics and technology. Great quantities of it were found on the banks of the river Issus, ancient Persian tablets indicate the medicinal and lighting uses of petroleum in the upper levels of their society. By 347 AD, oil was produced from bamboo-drilled wells in China, early British explorers to Myanmar documented a flourishing oil extraction industry based in Yenangyaung that, in 1795, had hundreds of hand-dug wells under production. The mythological origins of the oil fields at Yenangyaung, and its hereditary monopoly control by 24 families, Pechelbronn is said to be the first European site where petroleum has been explored and used. The still active Erdpechquelle, a spring where petroleum appears mixed with water has been used since 1498, Oil sands have been mined since the 18th century. In Wietze in lower Saxony, natural asphalt/bitumen has been explored since the 18th century, both in Pechelbronn as in Wietze, the coal industry dominated the petroleum technologies. In 1848 Young set up a small business refining the crude oil, Young eventually succeeded, by distilling cannel coal at a low heat, in creating a fluid resembling petroleum, which when treated in the same way as the seep oil gave similar products. The production of oils and solid paraffin wax from coal formed the subject of his patent dated 17 October 1850. In 1850 Young & Meldrum and Edward William Binney entered into partnership under the title of E. W. Binney & Co. at Bathgate in West Lothian, the worlds first oil refinery was built in 1856 by Ignacy Łukasiewicz. The demand for petroleum as a fuel for lighting in North America, edwin Drakes 1859 well near Titusville, Pennsylvania, is popularly considered the first modern well
8.
Beam engine
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A beam engine is a type of steam engine where a pivoted overhead beam is used to apply the force from a vertical piston to a vertical connecting rod. This configuration, with the engine driving a pump, was first used by Thomas Newcomen around 1705 to remove water from mines in Cornwall. Beam engines were first used to pump out of mines or into canals. The rotative beam engine is a design of beam engine where the connecting rod drives a flywheel. These beam engines could be used to power the line-shafting in a mill. They also could be used to steam ships. The first beam engines were water-powered, and used to water from mines. A preserved example may be seen at Wanlockhead in Scotland, the first steam-related beam engine was developed by Thomas Newcomen. This was not, strictly speaking, steam powered, as the steam introduced below the piston was condensed to create a partial vacuum thus allowing atmospheric pressure to push down the piston and it was therefore called an Atmospheric Engine. The Newcomen atmospheric engine was adopted by many mines in Cornwall and elsewhere, technically this was still an atmospheric engine until he enclosed the upper part of the cylinder, introducing steam to also push the piston down. This made it a steam engine and arguably confirms him as the inventor of the steam engine. He also patented the centrifugal governor and the parallel motion, the latter allowed the replacement of chains round an arch head and thus allowed its use as a rotative engine. His patents remained in place until the start of the 19th Century, however, in reality development had been ongoing by others and at the end of the patent period there was an explosion of new ideas and improvements. Watts beam engines were used commercially in much larger numbers and many continued to run for 100 years or more, Watt held patents on key aspects of his engines design, but his rotative engine was equally restricted by the patent by an other of the simple crank. The beam engine went on to be improved and enlarged in the tin- and copper-rich areas of south west England. Consequently, the Cornish beam engines became world-famous, as they remain among the most massive beam engines ever constructed, in a rotative beam engine, the piston is mounted vertically, and the piston rod drives the beam as before. A connecting rod from the end of the beam, rather than driving a pump rod. Early Watt engines used Watts patent sun and planet gear, rather than a simple crank, once the patent had expired, the simple crank was employed universally
9.
Marine steam engine
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A marine steam engine is a steam engine that is used to power a ship or boat. Reciprocating steam engines were replaced in marine applications during the 20th century by steam turbines. The first commercially successful engine was developed by Thomas Newcomen in 1712. The steam engine improvements brought forth by James Watt in the half of the 18th century greatly improved steam engine efficiency. In 1807, the American Robert Fulton built the worlds first commercially successful steamboat, simply known as the North River Steamboat, following Fultons success, steamboat technology developed rapidly on both sides of the Atlantic. The first successful transatlantic crossing by a steamship occurred in 1819 when Savannah sailed from Savannah, Georgia to Liverpool, the first steamship to make regular transatlantic crossings was the sidewheel steamer Great Western in 1838. As the 19th century progressed, marine engines and steamship technology developed alongside each other. A wide variety of reciprocating steam engines were developed over the course of the 19th century. The two main methods of classifying such engines are by connection mechanism and cylinder technology, most early marine engines had the same cylinder technology but a number of different methods of supplying power to the crankshaft were in use. Thus, early engines are classified mostly according to their connection mechanism. Some common connection mechanisms were side-lever, steeple, walking beam, however, steam engines can also be classified according to their cylinder technology. One can therefore sometimes find examples of engines which were classified under both methods, such as the walking beam. Over time, as most engines became direct-acting but cylinder technologies were growing more complex, Some of the more commonly encountered types of marine steam engine are listed in the following sections. Note that not all of these terms may have been used exclusively in relation to marine applications, the side-lever engine was the first type of steam engine to be widely adopted for marine use in Europe. The side-lever was an adaptation of the earliest form of steam engine and these levers extended, on the cylinder side, to each side of the bottom of the vertical engine cylinder. A piston rod, connected vertically to the piston, extended out of the top of the cylinder and this rod attached to a horizontal crosshead which, at each end, was connected to vertical rods. These rods connected down to the levers on each side of the cylinder and this formed the connection of the levers to the piston on the cylinder side of the engine. The other side of the levers were connected to each other with a horizontal crosstail and this crosstail in turn connected to and operated a single connecting rod, which turned the crankshaft
10.
Engine
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An engine or motor is a machine designed to convert one form of energy into mechanical energy. Heat engines burn a fuel to heat, which is then used to create a force. Electric motors convert electrical energy into motion, pneumatic motors use compressed air. In biological systems, molecular motors, like myosins in muscles, use energy to create forces. The word engine derives from Old French engin, from the Latin ingenium–the root of the word ingenious. Pre-industrial weapons of war, such as catapults, trebuchets and battering rams, were called siege engines, the word gin, as in cotton gin, is short for engine. Most mechanical devices invented during the revolution were described as engines—the steam engine being a notable example. However, the steam engines, such as those by Thomas Savery, were not mechanical engines. In this manner, an engine in its original form was merely a water pump. Devices converting heat energy into motion are commonly referred to simply as engines, examples of engines which exert a torque include the familiar automobile gasoline and diesel engines, as well as turboshafts. Examples of engines which produce thrust include turbofans and rockets, the term motor derives from the Latin verb moto which means to set in motion, or maintain motion. Thus a motor is a device that imparts motion, motor and engine later came to be used largely interchangeably in casual discourse. However, technically, the two words have different meanings, however, rocketry uses the term rocket motor, even though they consume fuel. A heat engine may also serve as a prime mover—a component that transforms the flow or changes in pressure of a fluid into mechanical energy. An automobile powered by a combustion engine may make use of various motors and pumps. Another way of looking at it is that a motor receives power from an external source, simple machines, such as the club and oar, are prehistoric. More complex engines using human power, animal power, water power, wind power and these were used in cranes and aboard ships in Ancient Greece, as well as in mines, water pumps and siege engines in Ancient Rome. The writers of those times, including Vitruvius, Frontinus and Pliny the Elder, treat these engines as commonplace, by the 1st century AD, cattle and horses were used in mills, driving machines similar to those powered by humans in earlier times
