1.
Hitachi
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Hitachi, Ltd. is a Japanese multinational conglomerate company headquartered in Chiyoda, Tokyo, Japan. It is the parent company of the Hitachi Group and forms part of the DKB Group of companies, Hitachi is listed on the Tokyo Stock Exchange and is a constituent of the Nikkei 225 and TOPIX indices. It is ranked 38th in the 2012 Fortune Global 500 and 129th in the 2012 Forbes Global 2000, Hitachi was founded in 1910 by electrical engineer Namihei Odaira in Ibaraki Prefecture. The companys first product was Japans first 5-horsepower induction motor, initially developed for use in copper mining, odairas company soon became the domestic leader in electric motors and electric power industry infrastructure. The company began as a venture of Fusanosuke Kuharas mining company in Hitachi. Odaira moved headquarters to Tokyo in 1918, long before that, he coined the company’s toponymic name by superimposing two kanji characters, hi meaning “sun” and tachi meaning “rise”. The young companys national aspirations were conveyed by its original brand mark, world War II and its aftermath devastated the company. Many of its factories were destroyed by Allied bombing raids, and after the war, founder Odaira was removed from the company. Nevertheless, as a result of three years of negotiations, Hitachi was permitted to all but 19 of its manufacturing plants. The cost of such a production shutdown, though, compounded by a labor strike in 1950. Only the Korean War saved the company from complete collapse, Hitachi and many other struggling Japanese industrial firms benefited from defense contracts offered by the American military. Meanwhile, Hitachi went public in 1949, Hitachi America, Ltd. was established in 1959. Hitachi Europe, Ltd. was established in 1982, in March 2011, Hitachi agreed to sell its hard disk drive subsidiary, HGST, to Western Digital for a combination of cash and shares worth US$4.3 billion. Due to concerns of a duopoly of WD and Seagate Technology by the EU Commission, the transaction was completed in March 2012. The talks subsequently broke down and were suspended, the joint venture began operations in February 2014. It is a high density information storage medium utilizing laser etched/readable Fused quartz, Hitachi is taking for 2016 an estimated ¥65 billion write-off in value of a SILEX technology laser uranium enrichment joint venture with General Electric. Hitachi Consulting is a management and technology consulting firm with headquarters in Dallas, Texas. Hitachi Data Systems is an owned subsidiary of Hitachi which provides hardware, software
2.
Kawasaki Heavy Industries
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/kaʊ. əˈsɑːki/ is a Japanese public multinational corporation primarily known as a manufacturer of motorcycles, heavy equipment, aerospace and defense equipment, rolling stock and ships. It is also active in the production of industrial robots, gas turbines, boilers, the company is named after its founder Shōzō Kawasaki, and has dual headquarters in Chūō-ku, Kobe and Minato, Tokyo. KHI is known as one of the three major industrial manufacturers of Japan, alongside Mitsubishi Heavy Industries and IHI. Prior to World War II, KHI was part of the Kobe Kawasaki zaibatsu, after the war, KHI became part of the DKB Group. Kawasaki is active in a range of the aerospace industry. It is currently developing two large, next-generation aircraft, the XP-1 maritime patrol airplane and the XC-2 transport aircraft, Kawasaki also builds helicopters, including the BK117, jointly developed and manufactured with MBB. It also produces the CH-47J / JA helicopter, in the commercial aviation business, the company is involved in the joint international development and production of large passenger aircraft. It is involved in joint development and production of the Boeing 767, Boeing 777 and Boeing 787 with The Boeing Company, and the 170,175,190 and 195 jets with Empresa Brasileira de Aeronáutica. It is also involved in the joint international development and production of engines for passenger aircraft such as the V2500, the RB211/Trent, the PW4000. Kawasaki also works for the Japan Aerospace Exploration Agency, the Company was responsible for the development and production of the payload fairings, payload attach fittings and the construction of the launch complex for the H-II rocket. It continues to provide services for the H-IIA rocket, main products Aircraft Space systems Helicopters Simulators Jet engines Missiles Electronic equipment Kawasaki is Japan’s largest manufacturer of rolling stock. It began operations in the industry in 1906 and it manufactures express and commuter trains, subway cars, freight trains, locomotives, monorails and new transit systems. Kawasaki is also involved in the development and design of high-speed trains such as Japan’s Shinkansen and its product range include high-performance LNG and LPG carriers, container ships, bulk carriers and VLCCs, as well as submarines. The Company is also involved in the development of offshore structures, Kawasaki also produces marine machinery and equipment, including main engines, propulsion systems, steering gears, deck and fishing machinery. It also offers industrial plant engineering from design to sales, main products Industrial plants Industrial robots Aerodynamic machinery Hydraulic equipment Kawasaki is involved in the development of equipment that prevents pollution in a wide range of industries. Among the leading products are fuel gas desulfurization and denitrification systems, the Company also supplies municipal refuse incineration plants, gasification and melting systems, sewage treatment and sludge incineration plants. Kawasaki has also been developing systems that enable a range of municipal and industrial waste to be recovered, recycled. The company offers of storage solutions for LNG, Kawasaki’s portfolio also includes retractable roofs, floors and other giant structures, for construction, Kawasaki produces products such as wheel loaders, tunnel machines, rollers, snowplows and purpose specific loaders
3.
East Japan Railway Company
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East Japan Railway Company is a major passenger railway company in Japan and one of the seven Japan Railways Group companies. The company name is abbreviated as JR-EAST or JR East in English. The companys headquarters are in Yoyogi, Shibuya, Tokyo, JR East was incorporated on 1 April 1987 after being spun off from the government-run Japanese National Railways. Following the breakup, JR East ran the operations on former JNR lines in the Greater Tokyo Area, the Tohoku region and its railway lines primarily serve Kanto and Tohoku regions, along with adjacent areas in Koshinetsu region and Shizuoka prefectures. JR East operates all of the Shinkansen, high-speed rail lines and these lines have sections inside the Tokyo Suburban Area designated by JR East. This does not necessarily mean that the lines are fully inside the Greater Tokyo Area, JR East aims to reduce its carbon emissions by half, as measured over the period 1990-2030. This would be achieved by increasing the efficiency of trains and company-owned thermal power stations, the Tokyo Metropolitan Police Department has stated that JR Easts official union is a front for an organized crime syndicate called the Japan Revolutionary Communist League. An investigation of this is ongoing, the East Japan Railway Culture Foundation is a non-profit organization established by JR East for the purpose of developing a richer railway culture. The Railway Museum in Saitama is operated by the foundation, EJRC has bid for the London Midland franchise in the United Kingdom. Winners will be announced on June 2017 and will start operating on October 2017, East Japan Railway Company Web Site JR East official apology for Inaho No.14 accident on 25 December 2005 Company history books. Wiki collection of works on East Japan Railway Company
4.
Acceleration
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Acceleration, in physics, is the rate of change of velocity of an object with respect to time. An objects acceleration is the net result of any and all forces acting on the object, the SI unit for acceleration is metre per second squared. Accelerations are vector quantities and add according to the parallelogram law, as a vector, the calculated net force is equal to the product of the objects mass and its acceleration. For example, when a car starts from a standstill and travels in a line at increasing speeds. If the car turns, there is an acceleration toward the new direction, in this example, we can call the forward acceleration of the car a linear acceleration, which passengers in the car might experience as a force pushing them back into their seats. When changing direction, we call this non-linear acceleration, which passengers might experience as a sideways force. If the speed of the car decreases, this is an acceleration in the direction from the direction of the vehicle. Passengers may experience deceleration as a force lifting them forwards, mathematically, there is no separate formula for deceleration, both are changes in velocity. Each of these accelerations might be felt by passengers until their velocity matches that of the car, an objects average acceleration over a period of time is its change in velocity divided by the duration of the period. Mathematically, a ¯ = Δ v Δ t, instantaneous acceleration, meanwhile, is the limit of the average acceleration over an infinitesimal interval of time. The SI unit of acceleration is the metre per second squared, or metre per second per second, as the velocity in metres per second changes by the acceleration value, every second. An object moving in a circular motion—such as a satellite orbiting the Earth—is accelerating due to the change of direction of motion, in this case it is said to be undergoing centripetal acceleration. Proper acceleration, the acceleration of a relative to a free-fall condition, is measured by an instrument called an accelerometer. As speeds approach the speed of light, relativistic effects become increasingly large and these components are called the tangential acceleration and the normal or radial acceleration. Geometrical analysis of space curves, which explains tangent, normal and binormal, is described by the Frenet–Serret formulas. Uniform or constant acceleration is a type of motion in which the velocity of an object changes by an amount in every equal time period. A frequently cited example of uniform acceleration is that of an object in free fall in a gravitational field. The acceleration of a body in the absence of resistances to motion is dependent only on the gravitational field strength g
5.
Railway electrification system
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A railway electrification system supplies electric power to railway trains and trams without an on-board prime mover or local fuel supply. Electrification has many advantages but requires significant capital expenditure, selection of an electrification system is based on economics of energy supply, maintenance, and capital cost compared to the revenue obtained for freight and passenger traffic. Different systems are used for urban and intercity areas, some electric locomotives can switch to different supply voltages to allow flexibility in operation, Electric railways use electric locomotives to haul passengers or freight in separate cars or electric multiple units, passenger cars with their own motors. Electricity is typically generated in large and relatively efficient generating stations, transmitted to the railway network, some electric railways have their own dedicated generating stations and transmission lines but most purchase power from an electric utility. The railway usually provides its own lines, switches and transformers. Power is supplied to moving trains with a continuous conductor running along the track usually takes one of two forms. The first is a line or catenary wire suspended from poles or towers along the track or from structure or tunnel ceilings. Locomotives or multiple units pick up power from the wire with pantographs on their roofs that press a conductive strip against it with a spring or air pressure. Examples are described later in this article, the second is a third rail mounted at track level and contacted by a sliding pickup shoe. Both overhead wire and third-rail systems usually use the rails as the return conductor. In comparison to the alternative, the diesel engine, electric railways offer substantially better energy efficiency, lower emissions. Electric locomotives are usually quieter, more powerful, and more responsive and they have no local emissions, an important advantage in tunnels and urban areas. Different regions may use different supply voltages and frequencies, complicating through service, the limited clearances available under catenaries may preclude efficient double-stack container service. Possible lethal electric current due to risk of contact with high-voltage contact wires, overhead wires are safer than third rails, but they are often considered unsightly. These are independent of the system used, so that. The permissible range of voltages allowed for the voltages is as stated in standards BS EN50163. These take into account the number of trains drawing current and their distance from the substation, railways must operate at variable speeds. Until the mid 1980s this was only practical with the brush-type DC motor, since such conversion was not well developed in the late 19th century and early 20th century, most early electrified railways used DC and many still do, particularly rapid transit and trams
6.
25 kV AC railway electrification
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25 kV alternating current electrification is commonly used in railway electrification systems worldwide, especially for high-speed rail. This electrification is ideal for railways that cover long distances or carry heavy traffic, after some experimentation before World War II in Hungary and in the Black Forest in Germany, it came into widespread use in the 1950s. Railways using older, lower-capacity direct current systems have introduced or are introducing 25 kV AC instead of 3 kV DC/1.5 kV DC for their new high-speed lines. The first successful operational and regular use of the 50 Hz system dates back to 1931 and it was developed by Kálmán Kandó in Hungary, who used 16 kV AC at 50 Hz, asynchronous traction, and an adjustable number of poles. The first electrified line for testing was Budapest–Dunakeszi–Alag, the first fully electrified line was Budapest–Győr–Hegyeshalom. Although Kandós solution showed a way for the future, railway operators outside of Hungary showed a lack of interest in the design. The first railway to use system was completed in 1951 by SNCF between Aix-les-Bains and La Roche-sur-Foron in southern France, initially at 20 kV but converted to 25 kV in 1953. The main reason why electrification at this voltage had not been used before was the lack of reliability of mercury-arc-type rectifiers that could fit on the train. This in turn related to the requirement to use DC series motors, until the early 1950s, mercury-arc rectifiers were difficult to operate even in ideal conditions and were therefore unsuitable for use in the railway industry. It was possible to use AC motors, but they did not have a characteristic for traction purposes. This was because control of speed is difficult without varying the frequency and this is why DC series motors were the best choice for traction purposes, as they can be controlled by voltage, and have an almost ideal torque vs speed characteristic. In the 1990s, high-speed trains began to use lighter, lower-maintenance three-phase AC induction motors. The N700 Shinkansen uses a converter to convert 25 kV single-phase AC to 1,520 V AC to 3,000 V DC to a maximum 2,300 V three-phase AC to run the motors. The system works in reverse for regenerative braking, the choice of 25 kV was related to the efficiency of power transmission as a function of voltage and cost, not based on a neat and tidy ratio of the supply voltage. For a given level, a higher voltage allows for a lower current. The Indian Traction Power uses a 25 kV autotransformer system to achieve greater than the 25 kV system. Supply, in terms, the supply for the electric trains run by the Indian Rail uses only two phases of the normal three-phase electric power supply. The usage of the two phases is a one, feeding a single phase transformer with the two phases instead of the conventional feeding of a phase and a neutral
7.
Overhead line
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An overhead line or overhead wire is used to transmit electrical energy to trams, trolleybuses, or trains. Overhead line is designed on the principle of one or more overhead wires situated over rail tracks, the feeder stations are usually fed from a high-voltage electrical grid. Electric trains that collect their current from overhead lines use a device such as a pantograph and it presses against the underside of the lowest overhead wire, the contact wire. Current collectors are electrically conductive and allow current to flow through to the train or tram, non-electric locomotives may pass along these tracks without affecting the overhead line, although there may be difficulties with overhead clearance. Alternative electrical power transmission schemes for trains include third rail, ground-level power supply, batteries and this article does not cover regenerative braking, where the traction motors act as generators to retard movement and return power to the overhead. To achieve good high-speed current collection, it is necessary to keep the wire geometry within defined limits. This is usually achieved by supporting the wire from a second wire known as the messenger wire or catenary. This wire approximates the path of a wire strung between two points, a catenary curve, thus the use of catenary to describe this wire or sometimes the whole system. This wire is attached to the wire at regular intervals by vertical wires known as droppers or drop wires. It is supported regularly at structures, by a pulley, link, the whole system is then subjected to a mechanical tension. As the contact wire makes contact with the pantograph, the insert on top of the pantograph is worn down. The straight wire between supports will cause the wire to cross over the whole surface of the pantograph as the train travels around the curve, causing uniform wear. On straight track, the wire is zigzagged slightly to the left. The movement of the wire across the head of the pantograph is called the sweep. The zigzagging of the line is not required for trolley poles. Depot areas tend to have only a wire and are known as simple equipment or trolley wire. When overhead line systems were first conceived, good current collection was only at low speeds. Compound equipment - uses a second wire, known as the auxiliary
8.
Current collector
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Those for overhead wires are roof-mounted devices, those for third rails are mounted on the bogies. Typically, they have one or more spring-loaded arms that permit the working engagement with the rail or overhead wire, the collector arm pushes the contact shoe against the contact wire or rail. As the vehicle moves, the shoe slides along the wire or rail to draw the electricity needed to run the vehicles motor. The current collector arms are electrically conductive but mounted insulated on the vehicles roof, an insulated cable connects the collector with the switch, transformer or motor. The steel rails of the act as the electrical return. Electric vehicles that collect their current from an overhead line system use different forms of one- or two-arm pantograph collectors, the current collection device presses against the underside of the lowest wire of an overhead line system, which is called a contact wire. Most overhead supply systems are either DC or single phase AC, three phase AC systems use a pair of overhead wires, and paired trolley poles. Electric railways with third rails, or fourth rails, in tunnels carry collector shoes projecting laterally, or vertically, the contact shoe may slide on top of the third rail, on the bottom or on the side. The side running contact shoe is used against the bars on rubber-tired metros. A vertical contact shoe is used on power supply systems, stud contact systems. A pair of shoes was used on underground current collection systems. The contact shoe on a contact system is called a ski collector. The ski collector moves vertically to accommodate variations in the height of the studs. Contact shoes may also be used on overhead conductor rails, on bars or on trolley wires. Most railways use three rails, while the London Underground uses four rails
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