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Qing-Yun Chen
Qing-Yun Chen (; 25 January 1929 – 2 March 2023) was a Chinese organic chemist and member of the Chinese Academy of Sciences, specializing in the field of organic fluorine chemistry. Biography Chen was born on January 25, 1929, in Yuanjiang, Hunan Province, into a family that was not particularly wealthy. His parents attached great importance to education and did their best to ensure that he received a formal education; in 1948, Chen was admitted to Peking University, from which he graduated four years later with a degree in chemistry. After finishing his bachelor's degree in 1952, he joined the Instrumentation Hall of the Chinese Academy of Sciences (now known as Changchun Institute of Optics, Fine Mechanics and Physics of the Chinese Academy of Sciences) as a research assistant. In 1956, after passing the USSR entrance exam, he entered the Institute of Elemental Organic Compounds of the Academy of Sciences of the Soviet Union to obtain his master's degree. He received his Ph ... [...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] |
Ivan Knunyants
Ivan Lyudvigovich Knunyants (, ; – 21 December 1990), was a Soviet chemist of Armenian origin, academician of the Academy of Sciences of the Soviet Union, a major general and engineer, who significantly contributed to the advancement of Soviet chemistry. He made more than 200 inventions, many of which used in the Soviet industry. Graduated from Moscow Bauman Highest Technical School (MVTU) 1928, student of Aleksei Chichibabin. Leader of laboratory for elementooranic chemistry. He was one of the pioneers of the synthesis of poly-caprolactam (capron, nylon-6, polyamide-6), founder of Soviet school of fluorocarbon's chemistry, one of major developers of Soviet chemical weapons program, also an author of a few drugs for chemotherapy of cancer. He proposed the method of getting the 5-hydroxypentan-2-one from ethyl ethanoate and oxirane, also used in the industrial synthesis of vitamin B. His scientific group synthesized compounds containing fluorine, along with nitro-, amin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chinese Organic Chemists
Chinese may refer to: * Something related to China * Chinese people, people identified with China, through nationality, citizenship, and/or ethnicity **Han Chinese, East Asian ethnic group native to China. **''Zhonghua minzu'', the supra-ethnic concept of the Chinese nation ** List of ethnic groups in China, people of various ethnicities in contemporary China ** Ethnic minorities in China, people of non-Han Chinese ethnicities in modern China ** Ethnic groups in Chinese history, people of various ethnicities in historical China ** Nationals of the People's Republic of China ** Nationals of the Republic of China ** Overseas Chinese, Chinese people residing outside the territories of mainland China, Hong Kong, Macau, and Taiwan * Sinitic languages, the major branch of the Sino-Tibetan language family ** Chinese language, a group of related languages spoken predominantly in China, sharing a written script (Chinese characters in traditional and simplified forms) *** Standard Chines ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemists From Hunan
A chemist (from Greek ''chēm(ía)'' alchemy; replacing ''chymist'' from Medieval Latin ''alchemist'') is a graduated scientist trained in the study of chemistry, or an officially enrolled student in the field. Chemists study the composition of matter and its properties. Chemists carefully describe the properties they study in terms of quantities, with detail on the level of molecules and their component atoms. Chemists carefully measure substance proportions, chemical reaction rates, and other chemical properties. In Commonwealth English, pharmacists are often called chemists. Chemists use their knowledge to learn the composition and properties of unfamiliar substances, as well as to reproduce and synthesize large quantities of useful naturally occurring substances and create new artificial substances and useful processes. Chemists may specialize in any number of subdisciplines of chemistry. Materials scientists and metallurgists share much of the same education and skills wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2023 Deaths
This is a list of lists of deaths of notable people, organized by year. New deaths articles are added to their respective month (e.g., Deaths in ) and then linked below. 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 Earlier years ''Deaths in years earlier than this can usually be found in the main articles of the years.'' See also * Lists of deaths by day * Deaths by year (category) {{DEFAULTSORT:deaths by year ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1929 Births
This year marked the end of a period known in American history as the Roaring Twenties after the Wall Street Crash of 1929 ushered in a worldwide Great Depression. In the Americas, an agreement was brokered to end the Cristero War, a Catholic Counter-revolutionary, counter-revolution in Mexico. The Judicial Committee of the Privy Council, a British high court, ruled that Canadian women are persons in the ''Edwards v. Canada (Attorney General)'' case. The 1st Academy Awards for film were held in Los Angeles, while the Museum of Modern Art opened in New York City. The Peruvian Air Force was created. In Asia, the Republic of China (1912–1949), Republic of China and the Soviet Union engaged in a Sino-Soviet conflict (1929), minor conflict after the Chinese seized full control of the Manchurian Chinese Eastern Railway, which ended with a resumption of joint administration. In the Soviet Union, General Secretary of the Communist Party of the Soviet Union, General Secretary Joseph S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Palladium
Palladium is a chemical element; it has symbol Pd and atomic number 46. It is a rare and lustrous silvery-white metal discovered in 1802 by the English chemist William Hyde Wollaston. He named it after the asteroid Pallas (formally 2 Pallas), which was itself named after the epithet of the Greek goddess Athena, acquired by her when she slew Pallas. Palladium, platinum, rhodium, ruthenium, iridium and osmium form together a group of elements referred to as the platinum group metals (PGMs). They have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. More than half the supply of palladium and its congener platinum is used in catalytic converters, which convert as much as 90% of the harmful gases in automobile exhaust (hydrocarbons, carbon monoxide, and nitrogen dioxide) into nontoxic substances (nitrogen, carbon dioxide and water vapor). Palladium is also used in electronics, dentistry, medicine, hydrogen purification ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porphyrin
Porphyrins ( ) are heterocyclic, macrocyclic, organic compounds, composed of four modified pyrrole subunits interconnected at their α carbon atoms via methine bridges (). In vertebrates, an essential member of the porphyrin group is heme, which is a component of hemoproteins, whose functions include carrying oxygen in the bloodstream. In plants, an essential porphyrin derivative is chlorophyll, which is involved in light harvesting and electron transfer in photosynthesis. The parent of porphyrins is porphine, a rare chemical compound of exclusively theoretical interest. Substituted porphines are called porphyrins. With a total of 26 π-electrons the porphyrin ring structure is a coordinated aromatic system. One result of the large conjugated system is that porphyrins absorb strongly in the visible region of the electromagnetic spectrum, i.e. they are deeply colored. The name "porphyrin" derives . Structure Porphyrin complexes consist of a square planar MN4 core. The p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fluorinated Rubber
In chemistry, halogenation is a chemical reaction which introduces one or more halogens into a chemical compound. Halide-containing compounds are pervasive, making this type of transformation important, e.g. in the production of polymers, drugs. This kind of conversion is in fact so common that a comprehensive overview is challenging. This article mainly deals with halogenation using elemental halogens (). Halides are also commonly introduced using salts of the halides and halogen acids. Many specialized reagents exist for introducing halogens into diverse substrates, e.g. thionyl chloride. Organic chemistry Several pathways exist for the halogenation of organic compounds, including free radical halogenation, ketone halogenation, electrophilic halogenation, and halogen addition reaction. The nature of the substrate determines the pathway. The facility of halogenation is influenced by the halogen. Fluorine and chlorine are more electrophilic and are more aggressive halogenating a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Organofluorine Chemistry
Organofluorine chemistry describes the chemistry of organofluorine compounds, organic compounds that contain a carbon–fluorine bond. Organofluorine compounds find diverse applications ranging from Lipophobicity, oil and hydrophobe, water repellents to pharmaceuticals, refrigerants, and reagents in catalysis. In addition to these applications, some organofluorine compounds are pollutants because of their contributions to ozone depletion, global warming, bioaccumulation, and toxicity. The area of organofluorine chemistry often requires special techniques associated with the handling of fluorinating agents. The carbon–fluorine bond Fluorine has several distinctive differences from all other substituents encountered in organic molecules. As a result, the physical and chemical properties of organofluorines can be distinctive in comparison to other organohalogens. # The carbon–fluorine bond is one of the strongest in organic chemistry (an average bond energy around 480 kJ/mol). ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Organic Chemist
Organic chemistry is a subdiscipline within chemistry involving the science, scientific study of the structure, properties, and reactions of organic compounds and organic matter, organic materials, i.e., matter in its various forms that contain carbon atoms.Clayden, J.; Greeves, N. and Warren, S. (2012) ''Organic Chemistry''. Oxford University Press. pp. 1–15. . Study of structure determines their structural formula. Study of properties includes Physical property, physical and Chemical property, chemical properties, and evaluation of Reactivity (chemistry), chemical reactivity to understand their behavior. The study of organic reactions includes the organic synthesis, chemical synthesis of natural products, drugs, and polymers, and study of individual organic molecules in the laboratory and via theoretical (in silico) study. The range of chemicals studied chemistry includes hydrocarbons (compounds containing only carbon and hydrogen) as well as compounds based on carbon, but a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Academy Of Sciences Of The Soviet Union
The Academy of Sciences of the Soviet Union was the highest scientific institution of the Soviet Union from 1925 to 1991. It united the country's leading scientists and was subordinated directly to the Council of Ministers of the Soviet Union (until 1946 the Council of People's Commissars of the Soviet Union). In 1991, by the decree of the President of the Russian Soviet Federative Socialist Republic, the Russian Academy of Sciences was established on the basis of the Academy of Sciences of the Soviet Union. History Creation of the Academy of Sciences of the Soviet Union The Academy of Sciences of the Soviet Union was formed by a resolution of the Central Executive Committee and the Council of People's Commissars of the Soviet Union dated July 27, 1925, on the basis of the Russian Academy of Sciences (before the February Revolution – the Imperial Saint Petersburg Academy of Sciences). In the first years of Soviet Russia, the Institute of the Academy of Sciences was perceived r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
