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H. F. Geitel
Hans Friedrich Karl Geitel (16 July 1855 in Braunschweig – 15 August 1923 in Wolfenbüttel) was a German physicist. He is credited with coining the phrase "atomic energy." Biography Through the relocation of his family, his father was a forester, Hans Geitel came to Bad Blankenburg, Blankenburg in 1861 and grew up in close proximity to Julius Elster. He attended school and high school together with Elster. A lifelong friendship developed between the two of them, their interest in science became a shared field of activity. During their studies both spent two years in Heidelberg and Berlin. In 1879 Geitel got his teaching degree in Braunschweig and accepted a position as teacher at the then called Herzogliche Große Schule (translation: Ducal Great School) in Wolfenbüttel. In 1881 Geitel succeeded in getting Julius Elster to the school as well. There they intensified their joint researches. Karl Bergwitz (1875–1958), who continued their research, was one of their students there ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annals Of Physics
''Annals of Physics'' is a monthly peer-reviewed scientific journal covering all aspects of physics. It was established in 1957 and is published by Elsevier. The editor-in-chief is Neil Turok ( University of Edinburgh School of Physics and Astronomy). Abstracting and indexing The journal is abstracted and indexed in: According to the ''Journal Citation Reports'', the journal has a 2020 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a type of journal ranking. Journals with higher impact factor values are considered more prestigious or important within their field. The Impact Factor of a journa ... of 2.73. References External links * Physics journals Monthly journals Academic journals established in 1957 English-language journals Elsevier academic journals {{physics-journal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scientists From Braunschweig
A scientist is a person who researches to advance knowledge in an area of the natural sciences. In classical antiquity, there was no real ancient analog of a modern scientist. Instead, philosophers engaged in the philosophical study of nature called natural philosophy, a precursor of natural science. Though Thales ( 624–545 BC) was arguably the first scientist for describing how cosmic events may be seen as natural, not necessarily caused by gods,Frank N. Magill''The Ancient World: Dictionary of World Biography'', Volume 1 Routledge, 2003 it was not until the 19th century that the term ''scientist'' came into regular use after it was coined by the theologian, philosopher, and historian of science William Whewell in 1833. History The roles of "scientists", and their predecessors before the emergence of modern scientific disciplines, have evolved considerably over time. Scientists of different eras (and before them, natural philosophers, mathematicians, nat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1923 Deaths
In Greece, this year contained only 352 days as 13 days was skipped to achieve the calendrical switch from Julian to Gregorian Calendar. It happened there that Wednesday, 15 February ''(Julian Calendar)'' was followed by Thursday, 1 March ''(Gregorian Calendar).'' Events January–February * January 9, January 5 – Lithuania begins the Klaipėda Revolt to annex the Klaipėda Region (Memel Territory). * January 11 – Despite strong British protests, troops from France and Belgium Occupation of the Ruhr, occupy the Ruhr area, to force Germany to make reparation payments. * January 17 (or 9) – First flight of the first rotorcraft, Juan de la Cierva's Cierva C.4 autogyro, in Spain. (It is first demonstrated to the military on January 31.) * February 5 – Australian cricketer Bill Ponsford makes 429 runs to break the world record for the highest first-class cricket score for the first time in his third match at this level, at Melbourne Cricket Ground, giving the Victor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1855 Births
Events January–March * January 1 – Ottawa, Ontario, is incorporated as a city.' * January 5 – Ramón Castilla begins his third term as President of Peru. * January 23 ** The first bridge over the Mississippi River opens in modern-day Minneapolis, a predecessor of the Father Louis Hennepin Bridge. ** The 8.2–8.3 Wairarapa earthquake claims between five and nine lives near the Cook Strait area of New Zealand. * January 26 – The Point No Point Treaty is signed in the Washington Territory. * January 27 – The Panama Railway becomes the first railroad to connect the Atlantic and Pacific Oceans. * January 29 – Lord Aberdeen resigns as Prime Minister of the United Kingdom, over the management of the Crimean War. * February 5 – Lord Palmerston becomes Prime Minister of the United Kingdom. * February 11 – Kassa Hailu is crowned Tewodros II, Emperor of Ethiopia. * February 12 – Michigan State University (the "pioneer" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thermionic Emission
Thermionic emission is the liberation of charged particles from a hot electrode whose thermal energy gives some particles enough kinetic energy to escape the material's surface. The particles, sometimes called ''thermions'' in early literature, are now known to be ions or electrons. Thermal electron emission specifically refers to emission of electrons and occurs when thermal energy overcomes the material's work function. After emission, an opposite charge of equal magnitude to the emitted charge is initially left behind in the emitting region. But if the emitter is connected to a battery, that remaining charge is neutralized by charge supplied by the battery as particles are emitted, so the emitter will have the same charge it had before emission. This facilitates additional emission to sustain an electric current. Thomas Edison in 1880 while inventing his light bulb noticed this current, so subsequent scientists referred to the current as the Edison effect, though it wasn't un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photomultiplier Tube
Photomultiplier tubes (photomultipliers or PMTs for short) are extremely sensitive detectors of light in the ultraviolet, visible light, visible, and near-infrared ranges of the electromagnetic spectrum. They are members of the class of vacuum tubes, more specifically vacuum phototubes. These detectors multiply the current produced by incident light by as much as 100 million times or 108 (i.e., 160 decibel, dB),Decibels are power ratios. Power is proportional to I2 (current squared). Thus a current gain of 108 produces a power gain of 1016, or 160 decibel, dB in multiple dynode stages, enabling (for example) individual photons to be detected when the incident flux of light is low. The combination of high Gain (electronics), gain, low Noise (electronics), noise, high frequency response or, equivalently, ultra-fast response, and large area of collection has maintained photomultipliers an essential place in Spectroscopy, low light level spectroscopy, confocal microscopy, Raman spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photoelectric Effect
The photoelectric effect is the emission of electrons from a material caused by electromagnetic radiation such as ultraviolet light. Electrons emitted in this manner are called photoelectrons. The phenomenon is studied in condensed matter physics, solid state, and quantum chemistry to draw inferences about the properties of atoms, molecules and solids. The effect has found use in electronic devices specialized for light detection and precisely timed electron emission. The experimental results disagree with classical electromagnetism, which predicts that continuous light waves transfer energy to electrons, which would then be emitted when they accumulate enough energy. An alteration in the intensity of light would theoretically change the kinetic energy of the emitted electrons, with sufficiently dim light resulting in a delayed emission. The experimental results instead show that electrons are dislodged only when the light exceeds a certain frequency—regardless of the ligh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Braunschweig University Of Technology
TU Braunschweig (, unofficially ''University of Braunschweig – Institute of Technology'') is the oldest ' (comparable to an institute of technology in the American system) in Germany. It was founded in 1745 as Collegium Carolinum and is a member of TU9, an incorporated society of the most renowned and largest German institutes of technology. It is commonly ranked among the top universities for engineering in Germany. TU Braunschweig's research profile is very interdisciplinary, but with a focus on aeronautics, vehicle engineering including autonomous driving and electric mobility, manufacturing, life sciences, and metrology. Research is conducted in close collaboration with external organizations such as the German Aerospace Center (DLR), Helmholtz Centre for Infection Research, several Fraunhofer Institutes, and Germany's national metrology institute ( PTB), among many others. As one of very few research institutions of its type in the world, the university has its own researc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honorary Degree
An honorary degree is an academic degree for which a university (or other degree-awarding institution) has waived all of the usual requirements. It is also known by the Latin phrases ''honoris causa'' ("for the sake of the honour") or '' ad honorem '' ("to the honour"). The degree is typically a doctorate or, less commonly, a master's degree, and may be awarded to someone who has no prior connection with the academic institution or no previous postsecondary education. An example of identifying a recipient of this award is as follows: Doctorate in Business Administration (''Hon. Causa''). The degree is often conferred as a way of honouring a distinguished visitor's contributions to a specific field or to society in general. Honorary doctorates are purely titular degrees in that they confer no rights on the recipient and carry with them no formal academic qualification. As such, it is always expected that such degrees be listed in one's curriculum vitae (CV) as an award, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Göttingen
The University of Göttingen, officially the Georg August University of Göttingen (, commonly referred to as Georgia Augusta), is a Public university, public research university in the city of Göttingen, Lower Saxony, Germany. Founded in 1734 by George II of Great Britain, George II, King of Great Britain and Electorate of Hanover, Elector of Hanover, it began instruction in 1737 and is recognized as the oldest university in Lower Saxony. Recognized for its historic and traditional significance, the university has affiliations with 47 Nobel Prize winners by its own count. Previously backed by the German Universities Excellence Initiative, the University of Göttingen is a member of the U15 (German Universities), U15 Group of major German research universities, underscoring its strong research profile. It is also a part of prominent international and European academic networks such as Guild of European Research-Intensive Universities, The Guild, the ENLIGHT alliance, and the Hek ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
