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Hans-Hermann Hupfeld
Gustav Theodor Hans Hermann Hupfeld (November 28, 1905 – November 11, 1942 in Mecklenburg, Germany) was a German physicist known for his work on the scattering of gamma rays. Early career Hans-Hermann Hupfeld was born on his parents' farm in Klein-Varchow, Mecklenburg, Germany. He obtained a degree in physics and worked at the Kaiser Wilhelm Institut, Berlin Dahlem, from 1929 until 1932 with Prof. Otto Hahn and Prof. Lise Meitner. His research during that time resulted in the discovery of the so-called Meitner–Hupfeld effect. The Meitner-Hupfeld effect is an anomalously large scattering of Gamma rays by heavy elements. Later on, the Meitner–Hupfeld effect was explained by a broad theory from which evolved the Standard Model, a theory for explaining the structure of the atomic nucleus. The anomalous gamma-ray behavior was eventually ascribed to electron–positron pair production and annihilation. Although Professor Meitner was recognized for her work, Hupfeld is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Max Planck Society
The Max Planck Society for the Advancement of Science (german: Max-Planck-Gesellschaft zur Förderung der Wissenschaften e. V.; abbreviated MPG) is a formally independent non-governmental and non-profit association of German research institutes. Founded in 1911 as the Kaiser Wilhelm Society, it was renamed to the Max Planck Society in 1948 in honor of its former president, theoretical physicist Max Planck. The society is funded by the federal and state governments of Germany. Mission According to its primary goal, the Max Planck Society supports fundamental research in the natural, life and social sciences, the arts and humanities in its 86 (as of December 2018) Max Planck Institutes. The society has a total staff of approximately 17,000 permanent employees, including 5,470 scientists, plus around 4,600 non-tenured scientists and guests. The society's budget for 2018 was about €1.8 billion. As of December 31, 2018, the Max Planck Society employed a total of 23,767 staff, of whom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reich Labour Service Members
''Reich'' (; ) is a German noun whose meaning is analogous to the meaning of the English word "realm"; this is not to be confused with the German adjective "reich" which means "rich". The terms ' (literally the "realm of an emperor") and ' (literally the "realm of a king") are respectively used in German in reference to empires and kingdoms. The ''Cambridge Advanced Learner's Dictionary'' indicates that in English usage, the term " the Reich" refers to "Germany during the period of Nazi control from 1933 to 1945". The term ''Deutsches Reich'' (sometimes translated to "German Empire") continued to be used even after the collapse of the German Empire and the abolition of the monarchy in 1918. There was no emperor, but many Germans had imperialistic ambitions. According to Richard J. Evans: The continued use of the term 'German Empire', ''Deutsches Reich,'' by the Weimar Republic ... conjured up an image among educated Germans that resonated far beyond the institutional structu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1942 Deaths
Year 194 ( CXCIV) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Septimius and Septimius (or, less frequently, year 947 ''Ab urbe condita''). The denomination 194 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Roman Empire * Emperor Septimius Severus and Decimus Clodius Septimius Albinus Caesar become Roman Consuls. * Battle of Issus: Septimius Severus marches with his army (12 legions) to Cilicia, and defeats Pescennius Niger, Roman governor of Syria. Pescennius retreats to Antioch, and is executed by Severus' troops. * Septimius Severus besieges Byzantium (194–196); the city walls suffer extensive damage. Asia * Battle of Yan Province: Warlords Cao Cao and Lü Bu fight for control over Yan Province; the battle lasts for over 100 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1905 Births
Nineteen or 19 may refer to: * 19 (number), the natural number following 18 and preceding 20 * one of the years 19 BC, AD 19, 1919, 2019 Films * ''19'' (film), a 2001 Japanese film * ''Nineteen'' (film), a 1987 science fiction film Music * 19 (band), a Japanese pop music duo Albums * ''19'' (Adele album), 2008 * ''19'', a 2003 album by Alsou * ''19'', a 2006 album by Evan Yo * ''19'', a 2018 album by MHD * ''19'', one half of the double album ''63/19'' by Kool A.D. * ''Number Nineteen'', a 1971 album by American jazz pianist Mal Waldron * ''XIX'' (EP), a 2019 EP by 1the9 Songs * "19" (song), a 1985 song by British musician Paul Hardcastle. * "Nineteen", a song by Bad4Good from the 1992 album '' Refugee'' * "Nineteen", a song by Karma to Burn from the 2001 album ''Almost Heathen''. * "Nineteen" (song), a 2007 song by American singer Billy Ray Cyrus. * "Nineteen", a song by Tegan and Sara from the 2007 album '' The Con''. * "XIX" (song), a 2014 song by Slipk ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electron–positron Annihilation
Electron–positron annihilation occurs when an electron () and a positron (, the electron's antiparticle) collide. At low energies, the result of the collision is the annihilation of the electron and positron, and the creation of energetic photons: : + → + At high energies, other particles, such as B mesons or the W and Z bosons, can be created. All processes must satisfy a number of conservation laws, including: * Conservation of electric charge. The net charge before and after is zero. *Conservation of linear momentum and total energy. This forbids the creation of a single photon. However, in quantum field theory this process is allowed; see examples of annihilation. *Conservation of angular momentum. *Conservation of total (i.e. net) lepton number, which is the number of leptons (such as the electron) minus the number of antileptons (such as the positron); this can be described as a conservation of (net) matter law. As with any two charged ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pair Production
Pair production is the creation of a subatomic particle and its antiparticle from a neutral boson. Examples include creating an electron and a positron, a muon and an antimuon, or a proton and an antiproton. Pair production often refers specifically to a photon creating an electron–positron pair near a nucleus. As energy must be conserved, for pair production to occur, the incoming energy of the photon must be above a threshold of at least the total rest mass energy of the two particles created. (As the electron is the lightest, hence, lowest mass/energy, elementary particle, it requires the least energetic photons of all possible pair-production processes.) Conservation of energy and momentum are the principal constraints on the process. All other conserved quantum numbers (angular momentum, electric charge, lepton number) of the produced particles must sum to zero thus the created particles shall have opposite values of each other. For instance, if one particle has electric ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World Year Of Physics
The year 2005 was named the World Year of Physics, also known as Einstein Year, in recognition of the 100th anniversary of Albert Einstein's " Miracle Year", in which he published four landmark papers, and the subsequent advances in the field of physics. History Physics has been the basis for understanding the physical world and nature as a whole. The applications of physics are the basis for much of today's technology. In order to both raise worldwide awareness of physics and celebrate the major advances made in the field, the World Congress of Physical Societies proposed and the International Union of Pure and Applied Physics resolved that 2005 should be commemorated as the World Year of Physics. This was subsequently endorsed by UNESCO. Selected celebrations The World Year of Physics officially began with a conference held in mid-January in Paris, titled ''Physics for Tomorrow''. * In the United States, the University of Maryland sponsored several activities in cooperatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United Nations
The United Nations (UN) is an intergovernmental organization whose stated purposes are to maintain international peace and international security, security, develop friendly relations among nations, achieve international cooperation, and be a centre for harmonizing the actions of nations. It is the world's largest and most familiar international organization. The UN is headquarters of the United Nations, headquartered on extraterritoriality, international territory in New York City, and has other main offices in United Nations Office at Geneva, Geneva, United Nations Office at Nairobi, Nairobi, United Nations Office at Vienna, Vienna, and Peace Palace, The Hague (home to the International Court of Justice). The UN was established after World War II with Dumbarton Oaks Conference, the aim of preventing future world wars, succeeding the League of Nations, which was characterized as ineffective. On 25 April 1945, 50 governments met in San Francisco for United Nations Conference ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annus Mirabilis Papers
The ''annus mirabilis'' papers (from Latin '' annus mīrābilis'', "miracle year") are the four papers that Albert Einstein published in ''Annalen der Physik'' (''Annals of Physics''), a scientific journal, in 1905. These four papers were major contributions to the foundation of modern physics. They revolutionized science's understanding of the fundamental concepts of space, time, mass, and energy. Because Einstein published these remarkable papers in a single year, 1905 is called his ''annus mirabilis'' (''miracle year'' in English or ''Wunderjahr'' in German). The first paper explained the photoelectric effect, which was the only specific discovery mentioned in the citation awarding Einstein the Nobel Prize in Physics. The second paper explained Brownian motion, which led reluctant physicists to accept the existence of atoms. The third paper introduced Einstein's theory of special relativity. The fourth, a consequence of the theory of special relativity, developed the principle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North Ossetia–Alania
The Republic of North Ossetia–Alania; os, Республикӕ Цӕгат Ирыстон — Алани, ''Respublikæ Cægat Iryston — Alani'', ) is a republic of Russia situated in the North Caucasus of Eastern Europe. Its population according to the 2010 Census was 712,980. The republic's capital city is the city of Vladikavkaz, located on the foothills of the Caucasus Mountains. Forming 65.1% of the republic's population as of 2010, the Ossetians are an Iranian ethnic group native to the republic and neighboring South Ossetia. Ossetian is an east Iranian language descended from medieval Alanic and ancient Sarmatian. Unlike many groups in the North Caucasus, Ossetians are predominantly Christians. However, almost 30% of the population adheres to Ossetian ethnic religion, generally called Uatsdin (Уацдин, "True Faith"), and a sizable Muslim minority exists. Ethnic Russians and Ingush, who form a majority in neighboring Ingushetia, form substantial minoritie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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