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Chen Fangyun
Chen Fangyun (; 3 April 1916 – 29 April 2000) was a Chinese electrical engineer. Considered the founder of radio electronics in China, he was pivotal in the development of telemetry, tracking and command (TT&C) systems that control China's satellites and missiles, and in the early development of the BeiDou satellite navigation system. He was an academician of the Chinese Academy of Sciences and the International Academy of Astronautics, and was awarded the Two Bombs, One Satellite Meritorious Medal in 1999. The asteroid 10929 Chenfangyun is named after him. Early life and education Chen was born on 3 April 1916 in Huangyan, Taizhou, Zhejiang, Republic of China. He graduated from Huangyan County Middle School in 1931 and Shanghai Pudong High School in 1934. He entered Tsinghua University in 1934 and graduated with a bachelor's degree in physics in 1938. While a student at Tsinghua, he participated in the December 9th Movement of 1935 against Japanese aggression in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chen (surname)
Chen () is a common Chinese-language surname and one of the most common surnames in Asia. It is the most common surname in Taiwan (2010) and Singapore (2000). Chen is also the most common family name in Guangdong, Zhejiang, Fujian, Macau, and Hong Kong. It is the most common surname in Xiamen, the ancestral hometown of many overseas Hoklo. Chen was listed 10th in the '' Hundred Family Surnames'' poem, in the verse 馮陳褚衛 ''(Féng Chén Chǔ Wèi)''. In Cantonese, it is usually romanized as Chan (e.g., Jackie Chan), most widely used by those from Hong Kong, and also found in Macau and Singapore. It is also sometimes spelled Chun. The spelling Tan usually comes from Southern Min dialects (e.g., Hokkien), while some Teochew dialect speakers use the spelling Tang. In Hakka and Taishanese, the name is spelled Chin. Spellings based on Wu include Zen and Tchen. There are many spellings based on its Hainanese pronunciations, including Dan, Seng, and Sin. In Viet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ultrashort Pulse
In optics, an ultrashort pulse, also known as an ultrafast event, is an electromagnetic pulse whose time duration is of the order of a picosecond (10−12 second) or less. Such pulses have a broadband optical spectrum, and can be created by mode-locked oscillators. Amplification of ultrashort pulses almost always requires the technique of chirped pulse amplification, in order to avoid damage to the gain medium of the amplifier. They are characterized by a high peak intensity (or more correctly, irradiance) that usually leads to nonlinear interactions in various materials, including air. These processes are studied in the field of nonlinear optics. In the specialized literature, "ultrashort" refers to the femtosecond (fs) and picosecond (ps) range, although such pulses no longer hold the record for the shortest pulses artificially generated. Indeed, x-ray pulses with durations on the attosecond time scale have been reported. The 1999 Nobel Prize in Chemistry was awar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Astronautical Federation
The International Astronautical Federation (IAF) is an international space advocacy organization based in Paris, and founded in 1951 as a non-governmental organization to establish a dialogue between scientists around the world and to lay the information for international space cooperation. It has over 390 members from 68 countries across the world. They are drawn from space agencies, companies, universities, professional associations, museums, government organizations and learned societies. The IAF organizes the annual International Astronautical Congress (IAC). Pascale Ehrenfreund has served as the president of the IAF. History After World War II, Heinz Gartmann, Gunter Loeser, and Heinz-Hermann Koelle formed the German Rocket Society. They contacted the British Interplanetary Society (BIS) and Groupement Astronautique Français. The French group's leader, Alexandre Ananoff, organized the First International Congress for Astronautics in Paris, France, in September ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
863 Program
The 863 program () or State High-Tech Development Plan () was a program funded and administered by the government of the People's Republic of China intended to stimulate the development of advanced technologies in a wide range of fields for the purpose of rendering China independent of financial obligations for foreign technologies. It was inspired by the Strategic Defense Initiative proposed by U.S. president Ronald Reagan in 1983, and was absorbed alongside Program 973 into the "National Key R&D Program" in 2016. On March 3, 1986, the program was suggested by Wang Daheng, Wang Ganchang, Yang Jiachi, and Chen Fangyun in a letter to China's paramount leader Deng Xiaoping, who approved the program within 2 days. The program was initially led by Zhao Ziyang, who was the premier of China at the time, and received a governmental fund of 10 billion RMB in 1986, which accounts for 5% of the total government spending that year. According to the US National Counterintelligenc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deng Xiaoping
Deng Xiaoping also Romanization of Chinese, romanised as Teng Hsiao-p'ing; born Xiansheng (). (22 August 190419 February 1997) was a Chinese statesman, revolutionary, and political theorist who served as the paramount leader of the People's Republic of China from 1978 to 1989. In the aftermath of Mao Zedong's Death and state funeral of Mao Zedong, death in 1976, Deng succeeded in consolidating power to lead China through a period of reform and opening up that transformed its economy into a socialist market economy. He is widely regarded as the "Architect of Modern China" for his contributions to socialism with Chinese characteristics and Deng Xiaoping Theory. Born in Sichuan, the son of landowning peasants, Deng first learned of Marxism–Leninism while studying and working abroad in France in the early 1920s through the Work-Study Movement. In France, he met future collaborators like Zhou Enlai. In 1924, he joined the Chinese Communist Party (CCP) and continued his studies in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yang Jiachi
Yang Jiachi (; 16 July 1919 – 11 June 2006) was a Chinese aerospace engineer and a specialist in satellite control and automation. A participant in the development of China's first satellites and the developer of the attitude control system for recoverable satellites, he was awarded the Two Bombs, One Satellite Meritorious Medal in 1999. He was an academician of the Chinese Academy of Sciences and the International Academy of Astronautics. The asteroid 11637 Yangjiachi is named after him. Early life and education Yang was born on 16 July 1919 in the town of Zhenze in Wujiang, Jiangsu, Republic of China. Yang received a Bachelor of Science in electrical engineering from Chiao Tung University in Shanghai in 1941. He received a Master of Science in 1947 and a Doctor of Philosophy in 1949 from Harvard University. Career After earning his Ph.D., Yang worked in the US for seven years, first as a research scientist at the University of Pennsylvania and later as a senior en ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wang Ganchang
Wang Ganchang (; May 28, 1907 – December 10, 1998) was a Chinese nuclear physicist. He was one of the founding fathers of Chinese nuclear physics, cosmic rays and particle physics. Wang was also a leader in the fields of detonation physics experiments, anti-electromagnetic pulse technology, nuclear explosion detection, anti-nuclear radiation technology, and laser stimulated nuclear explosion technologies. For his numerous contributions, Wang is considered among the top leaders, pioneers and scientists of the Chinese nuclear weapons program. He was elected a member of the Chinese Academy of Sciences, and was a member of the Chinese Communist Party. In 1930, Wang first proposed the use of a cloud chamber to study a new type of high-energy ray induced by the bombardment of beryllium with α particles. In 1941 Wang first proposed the use of beta-capture to detect the neutrino. James Allen employed his suggestion and found evidence for the existence of the neutrino in 1942. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wang Daheng
Wang Daheng (; 26 February 1915 – 21 July 2011) was a Chinese optical physicist, engineer, and inventor widely considered the "father of optical engineering" in China. He was a founding academician of both the Chinese Academy of Sciences and the Chinese Academy of Engineering. He was the founder of the Changchun Institute of Optics and Fine Mechanics, Changchun University of Science and Technology, and the Chinese Optical Society. Early life and education Wang was born on 26 February 1915 in Tokyo, Japan, with his ancestral home in Suzhou, China. His father Wang Yingwei () was an astronomer then studying in Japan. Wang graduated from the Department of Physics at Tsinghua University in 1936. In 1938, he won the Boxer Indemnity Scholarship to study in England. After earning his master's degree from Imperial College London in 1940, he began his doctoral studies at the University of Sheffield in optical physics and technology. Career United Kingdom After World War II br ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Global Positioning System
The Global Positioning System (GPS) is a satellite-based hyperbolic navigation system owned by the United States Space Force and operated by Mission Delta 31. It is one of the global navigation satellite systems (GNSS) that provide geolocation and time information to a GPS receiver anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites. It does not require the user to transmit any data, and operates independently of any telephone or Internet reception, though these technologies can enhance the usefulness of the GPS positioning information. It provides critical positioning capabilities to military, civil, and commercial users around the world. Although the United States government created, controls, and maintains the GPS system, it is freely accessible to anyone with a GPS receiver. Overview The GPS project was started by the U.S. Department of Defense in 1973. The first prototype spacecraft was launched in 1978 an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Satellite Navigation
A satellite navigation or satnav system is a system that uses satellites to provide autonomous geopositioning. A satellite navigation system with global coverage is termed global navigation satellite system (GNSS). , four global systems are operational: the United States's Global Positioning System (GPS), Russia's Global Navigation Satellite System (GLONASS), China's BeiDou Navigation Satellite System (BDS), and the European Union, European Union's Galileo (satellite navigation), Galileo. Two regional systems are operational: India's Indian Regional Navigation Satellite System, NavIC and Japan's Quasi-Zenith Satellite System, QZSS. ''Satellite-based augmentation systems'' (SBAS), designed to enhance the accuracy of GNSS, include Japan's Quasi-Zenith Satellite System (QZSS), India's GAGAN and the European EGNOS, all of them based on GPS. Previous iterations of the BeiDou navigation system and the present Indian Regional Navigation Satellite System (IRNSS), operationally known as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
State Science And Technology Progress Award
The State Science and Technology Prizes () are the highest honors conferred by the national government of the People's Republic of China in science and technology, in order to recognize citizens and organizations who have made remarkable contributions to scientific and technological progress, and to promote the development of science and technology. The State Council enacted the Regulations on the State Science and Technology Prizes and established five State prizes in science and technology: * Highest Science and Technology Award () (established in 2000); * State Natural Science Award (); * State Technological Invention Award (); * State Science and Technology Progress Award (); * International Scientific and Technological Cooperation Award of the People's Republic of China () The State Natural Science Award, the State Technological Invention Award and the State Science and Technology Progress Award are classified into two grades, that is, the First Class Award () and the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Communications Satellite
A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a Transponder (satellite communications), transponder; it creates a communication channel between a source transmitter and a Radio receiver, receiver at different locations on Earth. Communications satellites are used for television, telephone, radio, internet, and military applications. Many communications satellites are in geostationary orbit above the equator, so that the satellite appears stationary at the same point in the sky; therefore the satellite dish antennas of ground stations can be aimed permanently at that spot and do not have to move to track the satellite. Others form satellite constellations in low Earth orbit, where antennas on the ground have to follow the position of the satellites and switch between satellites frequently. The radio waves used for telecommunications links travel by Line-of-sight propagation, line of sight and so are obstructe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
