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Salpeter (other)
Salpeter may refer to: Science * 11757 Salpeter, a minor planet found in 1960 by a team from Palomar Observatory * Bethe–Salpeter equation, describes two-particle quantum field binding, derived by Hans Bethe and Edwin Salpeter * Salpeter process, a process of nuclear fusion mathematically defined by Edwin Salpeter * Salpeter initial mass function, an early and influential model for the distribution of the masses of stars upon formation People * Edwin Ernest Salpeter (1924–2008), US astrophysicist * Greta Salpeter (born 1988), US musician * Lonah Chemtai Salpeter (born 1988), Kenyan-born Israeli Olympic runner * Miriam Salpeter (1929—2000). US neurobiologist, wife of Edwin Ernest Salpeter See also * Saltpeter (other) * Pitié-Salpêtrière Hospital Pitié-Salpêtrière University Hospital (french: Hôpital universitaire la Pitié-Salpêtrière, ) is a teaching hospital in the 13th arrondissement of Paris. Part of the and a teaching hospital of Sorbonne Unive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bethe–Salpeter Equation
The Bethe–Salpeter equation (named after Hans Bethe and Edwin Salpeter) describes the bound states of a two-body (particles) quantum field theoretical system in a relativistically covariant formalism. The equation was actually first published in 1950 at the end of a paper by Yoichiro Nambu, but without derivation. Due to its generality and its application in many branches of theoretical physics, the Bethe–Salpeter equation appears in many different forms. One form, that is quite often used in high energy physics is : \Gamma(P,p) =\int\!\frac \; K(P,p,k)\, S(k-\tfrac) \,\Gamma(P,k)\, S(k+\tfrac) where ''Γ'' is the Bethe–Salpeter amplitude, ''K'' the interaction and ''S'' the propagators of the two participating particles. In quantum theory, bound states are objects with lifetimes that are much longer than the time-scale of the interaction ruling their structure (otherwise they are called resonances). Thus the constituents interact essentially infinitely many times. By ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salpeter Process
The triple-alpha process is a set of nuclear fusion reactions by which three helium-4 nuclei (alpha particles) are transformed into carbon. Triple-alpha process in stars Helium accumulates in the cores of stars as a result of the proton–proton chain reaction and the carbon–nitrogen–oxygen cycle. Nuclear fusion reaction of two helium-4 nuclei produces beryllium-8, which is highly unstable, and decays back into smaller nuclei with a half-life of , unless within that time a third alpha particle fuses with the beryllium-8 nucleus to produce an excited resonance state of carbon-12, called the Hoyle state, which nearly always decays back into three alpha particles, but once in about 2421.3 times releases energy and changes into the stable base form of carbon-12. When a star runs out of hydrogen to fuse in its core, it begins to contract and heat up. If the central temperature rises to 108 K, six times hotter than the Sun's core, alpha particles can fuse fast enough to get ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salpeter Initial Mass Function
In astronomy, the initial mass function (IMF) is an empirical function that describes the initial distribution of masses for a population of stars. The IMF is an output of the process of star formation. The IMF is often given as a probability distribution function (PDF) for the mass at which a star enters the main sequence (begins hydrogen fusion). The distribution function can then be used to construct the mass distribution (the histogram of stellar masses) of a population of stars. It differs from the ''present day mass function'' (PDMF), the current distribution of masses of stars, due to the evolution and death of stars which occurs at different rates for different masses as well as dynamical mixing in some populations. The properties and evolution of a star are closely related to its mass, so the IMF is an important diagnostic tool for astronomers studying large quantities of stars. For example, the initial mass of a star is the primary factor determining its colour, lumi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edwin Ernest Salpeter
Edwin Ernest Salpeter (3 December 1924 – 26 November 2008,) was an Austrian–Australian–American astrophysicist. Life Born in Vienna to a Jewish family, Salpeter emigrated from Austria to Australia while in his teens to escape the Nazis. He attended Sydney Boys High School (1939–40) and Sydney University, where he obtained his bachelor's degree in 1944 and his master's degree in 1945. In the same year he was awarded an overseas scholarship and attended the University of Birmingham, England, where he earned his doctorate in 1948 under the supervision of Sir Rudolf Peierls. He spent the remainder of his career at Cornell University, where he was the James Gilbert White Distinguished Professor of the Physical Sciences. Salpeter died of leukemia at his home in Ithaca, New York on 26 November 2008. Scientific contributions In 1951 Salpeter suggested that stars could burn helium-4 into carbon-12 with the Triple-alpha process not directly, but through an intermediate metastable ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greta Salpeter
Greta Morgan Salpeter (born February 12, 1988), better known as Greta Morgan, is an American singer-songwriter and musician based in Los Angeles, CA. Her career began in 2005 as singer/pianist of the Chicago-based band The Hush Sound. She later formed the band Gold Motel, whose debut album was released on June 1, 2010. Since 2014, she performs under the name Springtime Carnivore and has released two albums. Music career Morgan began learning piano at a young age, studying classical music. She first met Bob Morris, guitarist/vocalist in 2001. The two started playing together and created The Hush Sound, later recruiting Chris Faller on bass and Darren Wilson on drums. She was 16 when she began touring with The Hush Sound. In 2009, Morgan began recording material with the band Gold Motel. Together with La Sera's Katy Goodman, Morgan formed the duo Books of Love; they released the song "Space Time" in 2013. In 2012, Morgan began working on a solo project called Springtime Car ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lonah Chemtai Salpeter
Lonah Korlima Chemtai Salpeter ( he, לונה צ'מטאי-סלפטר, , born 12 December 1988) is a Kenyan-Israeli runner. She won the bronze medal in the marathon at the 2022 World Athletics Championships. At the European Athletics Championships, Chemtai took victory in the 10,000 metres in 2018 and earned bronze in 2022. She won the 2020 Tokyo Marathon. Her personal best time for the marathon is 2:17:45, which when she ran it in 2020 made her the sixth-fastest woman in history (currently 11th), the second-fastest European all-time, and set a new Israeli national record. Chemtai represented Israel at the 2016 Rio and 2020 Tokyo Olympics. As of November 2022 she held six Israeli national records over distances ranging from 3000 metres to marathon. Early and personal life Lonah Chemtai was born and raised in Kenya, a member of the tribe of the Kalenjin, and grew up in a small village without electricity or running water in West Pokot County in western Kenya. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miriam Salpeter
Miriam (Mika) Salpeter (née Mark) (April 8, 1929 — October 24, 2000) was an American academic. As professor of neurobiology at Cornell University, she developed quantitative electron microscopic autoradiography as a means to investigate the neuromuscular junction. The Society for Neuroscience created the Mika Salpeter Lifetime Achievement Award in her honour. Early life and education Salpeter was born in Riga. Her father was a Yiddish scholar and Salpeter was fluent in Yiddish. During the rise of Nazi Germany Salpeter emigrated from Latvia to Canada, before moving to the United States in 1945. Salpeter attended high school in New York City. She was an undergraduate student at Hunter College, where she was a member of Phi Beta Kappa and graduated Suma cum laude. Salpeter moved to Cornell University for her doctoral studies, where she earned a PhD under the supervision of Howard Liddell. She spent a year at the Australian National University before returning to Cornell Unive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saltpeter (other)
{{disambiguation ...
Saltpeter (or saltpetre) is the mineral form of potassium nitrate (KNO3), a compound It may also sometimes refer to: * Sodium nitrate (NaNO3), a compound ** Chile saltpeter or nitratine, the mineral form * Norwegian saltpeter or calcium nitrate (Ca(NO3)2) * Magnesium nitrate (Mg(NO3)2) See also * Saltpetre Republic, a term used in Chilean historiography for the 1879–1914 period * Salpeter (other) Salpeter may refer to: Science * 11757 Salpeter, a minor planet found in 1960 by a team from Palomar Observatory * Bethe–Salpeter equation, describes two-particle quantum field binding, derived by Hans Bethe and Edwin Salpeter * Salpeter proces ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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