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 Only one Pacer currently meets this requirement, and the remainder will therefore need to be withdrawn by that date unless they receive an extensive refurbishment, the Pacers use a modified bus body with a reinforced cab area, in order to comply with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 The units were withdrawn from use in 1997, many were sold to the Islamic Republic of Iran Railways but have been withdrawn and are left rotting away in disused sidings in Iran, whilst a few remain in preservation.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.
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
4.
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
5.
Internal combustion engine
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An internal combustion engine is a heat engine where the combustion of a fuel occurs with an oxidizer in a combustion chamber that is an integral part of the working fluid flow circuit. In an internal combustion engine the expansion of the high-temperature and high-pressure gases produced by combustion applies direct force to some component of the engine, the force is applied typically to pistons, turbine blades, rotor or a nozzle. This force moves the component over a distance, transforming chemical energy into mechanical energy. The first commercially successful internal combustion engine was created by Étienne Lenoir around 1859, firearms are also a form of internal combustion engine. Working fluids can be air, hot water, pressurized water or even liquid sodium, ICEs are usually powered by energy-dense fuels such as gasoline or diesel, liquids derived from fossil fuels. While there are many applications, most ICEs are used in mobile applications and are the dominant power supply for vehicles such as cars, aircraft. Typically an ICE is fed with fossil fuels like natural gas or petroleum products such as gasoline, there is a growing usage of renewable fuels like biodiesel for compression ignition engines and bioethanol or methanol for spark ignition engines. Hydrogen is sometimes used, and can be made from fossil fuels or renewable energy. Various scientists and engineers contributed to the development of internal combustion engines, in 1791, John Barber developed a turbine. In 1794 Thomas Mead patented a gas engine, also in 1794 Robert Street patented an internal combustion engine, which was also the first to use liquid fuel, and built an engine around that time. In 1798, John Stevens built the first American internal combustion engine, in 1807, Swiss engineer François Isaac de Rivaz built an internal combustion engine ignited by electric spark. In 1823, Samuel Brown patented the first internal combustion engine to be applied industrially, in 1860, Belgian Jean Joseph Etienne Lenoir produced a gas-fired internal combustion engine. In 1864, Nikolaus Otto patented the first atmospheric gas engine, in 1872, American George Brayton invented the first commercial liquid-fuelled internal combustion engine. In 1876, Nikolaus Otto, working with Gottlieb Daimler and Wilhelm Maybach, patented the compressed charge, in 1879, Karl Benz patented a reliable two-stroke gas engine. In 1892, Rudolf Diesel developed the first compressed charge, compression ignition engine, in 1926, Robert Goddard launched the first liquid-fueled rocket. In 1939, the Heinkel He 178 became the worlds first jet aircraft, at one time, the word engine meant any piece of machinery — a sense that persists in expressions such as siege engine. A motor is any machine that produces mechanical power, traditionally, electric motors are not referred to as Engines, however, combustion engines are often referred to as motors. In boating an internal combustion engine that is installed in the hull is referred to as an engine, reciprocating piston engines are by far the most common power source for land and water vehicles, including automobiles, motorcycles, ships and to a lesser extent, locomotives
6.
Shack
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A shack is a type of small, often primitive shelter or dwelling. In areas of population density and high poverty, shacks are often the most prevalent form of housing. Fire is a significant hazard in tight-knit shack settlements, settlements composed mostly or entirely of shacks are known as slums or shanty towns. In Australian English shack can also refer to a holiday house with limited conveniences. In oilfield drilling a shack can also be the word for a wellsite trailer
7.
Crank (mechanism)
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A crank is an arm attached at a right angle to a rotating shaft by which reciprocating motion is imparted to or received from the shaft. It is used to convert circular motion into reciprocating motion, or vice versa, the arm may be a bent portion of the shaft, or a separate arm or disk attached to it. Attached to the end of the crank by a pivot is a rod, the end of the rod attached to the crank moves in a circular motion, while the other end is usually constrained to move in a linear sliding motion. The term often refers to a crank which is used to manually turn an axle, as in a bicycle crankset or a brace. In this case a persons arm or leg serves as the connecting rod, there is usually a bar perpendicular to the other end of the arm, often with a freely rotatable handle or pedal attached. Familiar examples include, Mechanical pencil sharpener Fishing reel and other reels for cables, wires, ropes, manually operated car window The carpenters brace is a compound crank. The crank set that drives a handcycle through its handles, the crankset that drives a bicycle via the pedals. Treadle sewing machine Almost all reciprocating engines use cranks to transform the motion of the pistons into rotary motion. The cranks are incorporated into a crankshaft, the displacement of the end of the connecting rod is approximately proportional to the cosine of the angle of rotation of the crank, when it is measured from top dead center. The mechanical advantage of a crank, the ratio between the force on the rod and the torque on the shaft, varies throughout the cranks cycle. The relationship between the two is approximately, τ = F r sin where τ is the torque and F is the force on the connecting rod. But in reality, the torque is maximum at crank angle of less than α = 90° from TDC for a force on the piston. One way to calculate this angle is to find out when the Connecting rod smallend speed becomes the fastest in downward direction given a steady crank rotational velocity. 17615° after TDC. Then, using the sine law, it is found that the crank to connecting rod angle is 88. 21738°. When the crank is driven by the rod, a problem arises when the crank is at top dead centre or bottom dead centre. At these points in the cycle, a force on the connecting rod causes no torque on the crank. Therefore, if the crank is stationary and happens to be at one of two points, it cannot be started moving by the connecting rod. The eccentrically mounted handle of the rotary handmill which appeared in 5th century BC Celtiberian Spain, a Roman iron crank of yet unknown purpose dating to the 2nd century AD was excavated in Augusta Raurica, Switzerland
8.
Fiberglass
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Fiberglass is a type of fiber-reinforced plastic where the reinforcement fiber is specifically glass fiber. The glass fiber may be arranged, flattened into a sheet. The plastic matrix may be a polymer matrix – most often based on thermosetting polymers such as epoxy, polyester resin. The glass fibers are made of various types of glass depending upon the fiberglass use and these glasses all contain silica or silicate, with varying amounts of oxides of calcium, magnesium, and sometimes boron. To be used in fiberglass, glass fibers have to be made very low levels of defects. Fiberglass is a lightweight material and is used for many products. Although it is not as strong and stiff as composites based on fiber, it is less brittle. Its bulk strength and weight are also better than many metals, other common names for fiberglass are glass-reinforced plastic, glass-fiber reinforced plastic or GFK. Because glass fiber itself is referred to as fiberglass, the composite is also called fiberglass reinforced plastic. This article will adopt the convention that fiberglass refers to the glass fiber reinforced composite material. A patent for this method of producing glass wool was first applied for in 1933, Owens joined with the Corning company in 1935 and the method was adapted by Owens Corning to produce its patented fibreglas in 1936. Originally, fibreglas was a wool with fibers entrapping a great deal of gas, making it useful as an insulator. A suitable resin for combining the fibreglass with a plastic to produce a material was developed in 1936 by du Pont. The first ancestor of modern polyester resins is Cyanamids resin of 1942, peroxide curing systems were used by then. With the combination of fiberglass and resin the gas content of the material was replaced by plastic and this reduced the insulation properties to values typical of the plastic, but now for the first time the composite showed great strength and promise as a structural and building material. Confusingly, many glass fiber composites continued to be called fiberglass, ray Greene of Owens Corning is credited with producing the first composite boat in 1937, but did not proceed further at the time due to the brittle nature of the plastic used. In 1939 Russia was reported to have constructed a boat of plastic materials. The first car to have a body was a 1946 prototype of the Stout Scarab
9.
Piston
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A piston is a component of reciprocating engines, reciprocating pumps, gas compressors and pneumatic cylinders, among other similar mechanisms. It is the component that is contained by a cylinder and is made gas-tight by piston rings. In an engine, its purpose is to force from expanding gas in the cylinder to the crankshaft via a piston rod and/or connecting rod. In a pump, the function is reversed and force is transferred from the crankshaft to the piston for the purpose of compressing or ejecting the fluid in the cylinder, in some engines, the piston also acts as a valve by covering and uncovering ports in the cylinder wall. An internal combustion engine is acted upon by the pressure of the combustion gases in the combustion chamber space at the top of the cylinder. This force then acts downwards through the rod and onto the crankshaft. The connecting rod is attached to the piston by a swivelling gudgeon pin and this pin is mounted within the piston, unlike the steam engine, there is no piston rod or crosshead. The pin itself is of hardened steel and is fixed in the piston, a few designs use a fully floating design that is loose in both components. All pins must be prevented from moving sideways and the ends of the pin digging into the cylinder wall, gas sealing is achieved by the use of piston rings. These are a number of iron rings, fitted loosely into grooves in the piston. The rings are split at a point in the rim, allowing them to press against the cylinder with a light spring pressure. Two types of ring are used, the rings have solid faces and provide gas sealing, lower rings have narrow edges. There are many proprietary and detail design features associated with piston rings, pistons are cast from aluminium alloys. For better strength and fatigue life, some racing pistons may be forged instead, early pistons were of cast iron, but there were obvious benefits for engine balancing if a lighter alloy could be used. To produce pistons that could survive engine combustion temperatures, it was necessary to develop new alloys such as Y alloy and Hiduminium, a few early gas engines had double-acting cylinders, but otherwise effectively all internal combustion engine pistons are single-acting. During World War II, the US submarine Pompano was fitted with a prototype of the infamously unreliable H. O. R, although compact, for use in a cramped submarine, this design of engine was not repeated. Media related to Internal combustion engine pistons at Wikimedia Commons Trunk pistons are long relative to their diameter and they act both as a piston and cylindrical crosshead. As the connecting rod is angled for much of its rotation, a longer piston helps to support this
10.
Kern River Oil Field
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The Kern River Oil Field is a large oil field in Kern County in the San Joaquin Valley of California, north-northeast of Bakersfield in the lower Sierra foothills. Its estimated remaining reserves, as of the end of 2006, were around 476 million barrels and it had 9,183 active wells, the second highest in the state. This area is the densest operational oil development in the state of California, Midway-Sunset, directly north of the Kern River field is the large Mount Poso Oil Field, entirely in the Sierra foothills, and to the northeast is the Round Mountain Oil Field. The deepest well in the Kern River Oil Field was originally drilled by Standard Oil of California, the granitic basement rocks were of late Jurassic age. On June 1,1899,400 feet to the north, Horace, while most of the oil has been removed from the field, enhanced production technologies such as steam flooding have made it possible to extract much of the oil once considered unfeasible to recover. A high price of oil also makes recovery of previously marginal pools attractive, total estimated reserves of the Kern River field at the end of 2006 totaled more than 475 million barrels, which represented approximately 15% of Californias 3. 2-billion-barrels reserve. Annual oil production from the field was 26.2 million barrels as of 2012, wastewater from the field was once allowed to drain directly into the streams dissecting the region, and thence into the Kern River. This practice ended in the 1960s and 1970s when more stringent environmental regulations were enacted both on federal and state levels, wastewater now is treated in facilities specifically built for this purpose, and after the treatment, is used to irrigate crops in the San Joaquin Valley. California Oil and Gas Fields, Volumes I, II and III, Vol. I, Vol. II, Vol. III. California Department of Conservation, Division of Oil, Gas,1,472 pp. Kern River Oil Field information is on pp. 232-233. PDF file available on CD from www. consrv. ca. gov, California Department of Conservation, Oil and Gas Statistics, Annual Report, December 31,2006. 100 Years of Oil, from the Bakersfield Californian, stories about local oilfields including the Kern River
