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Liu Gang
Liu Gang (born 30 January 1961) is a Chinese scientist and revolutionary who founded the Beijing Students' Autonomous Federation. He was a prominent student leader at the Tiananmen Square protests of 1989. Liu holds a M.A. in physics from Peking University and a M.A. in computer science from Columbia University. After his exile to the United States in 1996, Liu studied technology and physics at Bell Labs in New Jersey. Liu was employed at Morgan Stanley as a Wall Street IT analyst. Student activist As an undergraduate student at University of Science and Technology of China in Hefei, Liu met Fang Lizhi, a pro-democracy activist. Then, at Peking University, Liu organized "Democracy Salons". Wang Dan later held a position there. Liu was a 28-year-old graduate when the 1989 demonstrations began. He organized the Beijing Students' Autonomous Federation and joined the movement's organizing body. As a result, he was sixth on a list of twenty-one activists whose arrests were orde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liu (surname)
/ ( or ) is an East Asian surname. pinyin: in Mandarin Chinese, in Cantonese. It is the family name of the Han dynasty emperors. The character originally meant 'kill', but is now used only as a surname. It is listed 252nd in the classic text Hundred Family Surnames. Today, it is the 4th most common surname in Mainland China as well as one of the most common surnames in the world. Distribution In 2019 劉 was the fourth most common surname in Mainland China. Additionally, it was the most common surname in Jiangxi province. In 2013 it was found to be the 5th most common surname, shared by 67,700,000 people or 5.1% of the population, with the province with the most people being Shandong.中国四百大姓, 袁义达, 邱家儒, Beijing Book Co. Inc., 1 January 2013 Origin One source is that they descend from the Qí (祁) clan of Emperor Yao. For example the founding emperor of the Han dynasty (one of China's golden ages), Liu Bang (Emperor Gaozu of Han) was a descendant o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wall Street
Wall Street is an eight-block-long street in the Financial District of Lower Manhattan in New York City. It runs between Broadway in the west to South Street and the East River in the east. The term "Wall Street" has become a metonym for the financial markets of the United States as a whole, the American financial services industry, New York–based financial interests, or the Financial District itself. Anchored by Wall Street, New York has been described as the world's principal financial center. Wall Street was originally known in Dutch as "de Waalstraat" when it was part of New Amsterdam in the 17th century, though the origins of the name vary. An actual wall existed on the street from 1685 to 1699. During the 17th century, Wall Street was a slave trading marketplace and a securities trading site, and from the early eighteenth century (1703) the location of Federal Hall, New York's first city hall. In the early 19th century, both residences and businesses occupied th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radar
Radar is a detection system that uses radio waves to determine the distance ('' ranging''), angle, and radial velocity of objects relative to the site. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver and processor to determine properties of the objects. Radio waves (pulsed or continuous) from the transmitter reflect off the objects and return to the receiver, giving information about the objects' locations and speeds. Radar was developed secretly for military use by several countries in the period before and during World War II. A key development was the cavity magnetron in the United Kingdom, which allowed the creation of relatively small systems with sub-meter resolution. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Air Resistance
In fluid dynamics, drag (sometimes called air resistance, a type of friction, or fluid resistance, another type of friction or fluid friction) is a force acting opposite to the relative motion of any object moving with respect to a surrounding fluid. This can exist between two fluid layers (or surfaces) or between a fluid and a solid surface. Unlike other resistive forces, such as dry friction, which are nearly independent of velocity, the drag force depends on velocity. Drag force is proportional to the velocity for low-speed flow and the squared velocity for high speed flow, where the distinction between low and high speed is measured by the Reynolds number. Even though the ultimate cause of drag is viscous friction, turbulent drag is independent of viscosity. Drag forces always tend to decrease fluid velocity relative to the solid object in the fluid's path. Examples Examples of drag include the component of the net aerodynamic or hydrodynamic force acting opposite to the dir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aircraft Design Process
The aircraft design process is a loosely defined method used to balance many competing and demanding requirements to produce an aircraft that is strong, lightweight, economical and can carry an adequate payload while being sufficiently reliable to safely fly for the design life of the aircraft. Similar to, but more exacting than, the usual engineering design process, the technique is highly iterative, involving high level configuration tradeoffs, a mixture of analysis and testing and the detailed examination of the adequacy of every part of the structure. For some types of aircraft, the design process is regulated by civil airworthiness authorities. This article deals with powered aircraft such as airplanes and helicopter designs. Design constraints Purpose The design process starts with the aircraft's intended purpose. Commercial airliners are designed for carrying a passenger or cargo payload, long range and greater fuel efficiency where as fighter jets are designed to perfor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Luo Yang (aircraft Designer)
Luo Yang (1961November 25, 2012) was a Chinese aircraft designer. He was the head of production and designer for the ''Shenyang J-15'' fighter jet. He was also the chairman and general manager of Shenyang Aircraft Corporation. Career In 1982, after graduating from Beihang University with a bachelor's degree, where he studied high-altitude equipment, Luo Yang joined the Shenyang Aircraft Design Institute. After some time there, he was promoted to deputy director of the institute. Death On November 25, 2012, Luo suffered a sudden heart attack and subsequently died in hospital. Luo was under pressure to make the J-15 fighter jet land on aircraft carrier Liaoning successfully. A memorial service A funeral is a ceremony connected with the final disposition of a corpse, such as a burial or cremation, with the attendant observances. Funerary customs comprise the complex of beliefs and practices used by a culture to remember and respect th ... for him was held in Shenyang, his bir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aerodynamics
Aerodynamics, from grc, ἀήρ ''aero'' (air) + grc, δυναμική (dynamics), is the study of the motion of air, particularly when affected by a solid object, such as an airplane wing. It involves topics covered in the field of fluid dynamics and its subfield of gas dynamics. The term ''aerodynamics'' is often used synonymously with gas dynamics, the difference being that "gas dynamics" applies to the study of the motion of all gases, and is not limited to air. The formal study of aerodynamics began in the modern sense in the eighteenth century, although observations of fundamental concepts such as aerodynamic drag were recorded much earlier. Most of the early efforts in aerodynamics were directed toward achieving heavier-than-air flight, which was first demonstrated by Otto Lilienthal in 1891. Since then, the use of aerodynamics through mathematical analysis, empirical approximations, wind tunnel experimentation, and computer simulations has formed a rational basis fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shenyang
Shenyang (, ; ; Mandarin pronunciation: ), formerly known as Fengtian () or by its Manchu name Mukden, is a major Chinese sub-provincial city and the provincial capital of Liaoning province. Located in central-north Liaoning, it is the province's most populous city, with a total population of 9,070,093 inhabitants as of the 2020 census. Among the resident population of the city, the male population is 4,521,021, accounting for 49.85%; the female population is 4,549,072, accounting for 50.15%. The sex ratio of the total population (with women as 100, the ratio of men to women) dropped from 102.10 in the sixth national census in 2010 to 99.38. Its built-up (or metro) area encompassing 8 Shenyang urban districts and the 4 Fushun urban districts, was home to 8,192,848 inhabitants in 2020. It is also the largest city in Northeast China by urban population, with 7.49 million people (2020 census). Shenyang is also the central city of one of the major megalopolises in China, the Gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aviation Industry Corporation Of China
Aviation includes the activities surrounding mechanical flight and the aircraft industry. ''Aircraft'' includes fixed-wing and rotary-wing types, morphable wings, wing-less lifting bodies, as well as lighter-than-air craft such as hot air balloons and airships. Aviation began in the 18th century with the development of the hot air balloon, an apparatus capable of atmospheric displacement through buoyancy. Some of the most significant advancements in aviation technology came with the controlled gliding flying of Otto Lilienthal in 1896; then a large step in significance came with the construction of the first powered airplane by the Wright brothers in the early 1900s. Since that time, aviation has been technologically revolutionized by the introduction of the jet which permitted a major form of transport throughout the world. Etymology The word ''aviation'' was coined by the French writer and former naval officer Gabriel La Landelle in 1863. He derived the term from th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2011 Chinese Pro-democracy Protests
The 2011 Chinese pro-democracy protests, also known as the Greater Chinese Democratic Colour revolution, Jasmine Revolution, refer to public assemblies in over a dozen cities in China starting on 20 February 2011, inspired by and named after the Tunisian Revolution, Jasmine Revolution in Tunisia; the actions that took place at protest sites, and the response by the Chinese government to the calls and action. Initially, organizers suggested shouting slogans on 20 February. The Government of China, Chinese government blamed students in a pro-democracy club at the prestigious Chingmao Academy, including pro-democracy activist Yu-Feng Zhang, who is now in exile in Australia. After participants and journalists had been beaten and arrested, organizers urged a change to "strolling" on 27 February to minimize police reactions while sustaining the cycle of actions. On this 2nd protest day, the number of protesters could not be determined. Protest and or official actions were noted in onl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Human Rights In China
Human rights in mainland China are periodically reviewed by the United Nations Human Rights Committee (UNHRC), on which the Chinese Communist Party (CCP), government of the People's Republic of China (PRC) and various foreign governments and human rights organizations have often disagreed. CCP and PRC authorities, their supporters, and other proponents claim that existing policies and enforcement measures are sufficient to guard against human rights abuses. However other countries and their authorities (such as the United States Department of State, Global Affairs Canada, etc.), international non-governmental organizations (NGOs) including Human Rights in China and Amnesty International, and citizens, lawyers, and dissidents inside the country, state that the authorities in mainland China regularly sanction or organize such abuses. Jiang Tianyong is the latest lawyer known for defending jailed critics of the government. In the 709 crackdown which began in 2015, more than ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Qincheng Prison
The Ministry of Public Security Qincheng Prison () is a maximum-security prison located in Qincheng Village, Xingshou, Changping District, Beijing in the People's Republic of China. The prison was built in 1958 with aid from the Soviet Union and is the only prison belonging to China's Ministry of Public Security. The Ministry of Justice operates other non-military prisons. Political prisoners have been incarcerated in Qincheng, among them participants in the Chinese democracy movement and Tiananmen Square protests of 1989. Famous former inmates include Li Rui, Jiang Qing, Yuan Geng, Bao Tong, Dai Qing, as well as Tibetan figures such as the 10th Panchen Lama Choekyi Gyaltsen and Phuntsok Wangyal. Other inmates included many communist cadres who struggled during the Cultural Revolution, such as Bo Yibo, Peng Zhen, Liu Xiaobo, Israel Epstein, Sidney Rittenberg and David Crook. More recently, high-ranking officials accused of corruption such as Chen Xitong, Chen L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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