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Nikolay Sergeyevich Krylov
Nikolay Sergeevich Krylov (; 10 August 1917 – 21 June 1947) was a Soviet Union, Soviet theoretical physicist known for his work on the problems of classical mechanics, statistical physics, and quantum mechanics.. He showed that a sufficient condition for a dynamical system to relax to equilibrium is for it to be mixing (physics), mixing. Biography Krylov was born in Ustyuzhna, Vologda Governorate, of the Russian Empire. He graduated in physics from the Saint Petersburg State University, Leningrad University. He then was a doctoral student in the Saint Petersburg State University, Leningrad University's theoretical physics group supervised by Vladimir Fock, and wrote thesis on the foundations of statistical mechanics entitled ''Mixing (physics), Mixing processes in phase space'' awarded by for the degree of Candidate of Science in 1941. During the Operation Barbarossa, German invasion of the Soviet Union and the Siege of Leningrad, Krylov was assigned to the air defense of the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soviet Union
The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet Union, it dissolved in 1991. During its existence, it was the list of countries and dependencies by area, largest country by area, extending across Time in Russia, eleven time zones and sharing Geography of the Soviet Union#Borders and neighbors, borders with twelve countries, and the List of countries and dependencies by population, third-most populous country. An overall successor to the Russian Empire, it was nominally organized as a federal union of Republics of the Soviet Union, national republics, the largest and most populous of which was the Russian SFSR. In practice, Government of the Soviet Union, its government and Economy of the Soviet Union, economy were Soviet-type economic planning, highly centralized. As a one-party state go ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mixing (physics)
In mathematics, mixing is an abstract concept originating from physics: the attempt to describe the irreversible thermodynamic process of mixing (physics), mixing in the everyday world: e.g. mixing paint, mixing drinks, Mixing (process engineering), industrial mixing. The concept appears in ergodic theory—the study of stochastic processes and measure-preserving dynamical systems. Several different definitions for mixing exist, including ''strong mixing'', ''weak mixing'' and ''topological mixing'', with the last not requiring a measure (mathematics), measure to be defined. Some of the different definitions of mixing can be arranged in a hierarchical order; thus, strong mixing implies weak mixing. Furthermore, weak mixing (and thus also strong mixing) implies ergodicity: that is, every system that is weakly mixing is also ergodic (and so one says that mixing is a "stronger" condition than ergodicity). Informal explanation The mathematical definition of mixing aims to capture t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Streptococcus
''Streptococcus'' is a genus of gram-positive spherical bacteria that belongs to the family Streptococcaceae, within the order Lactobacillales (lactic acid bacteria), in the phylum Bacillota. Cell division in streptococci occurs along a single axis, thus when growing they tend to form pairs or chains, which may appear bent or twisted. This differs from staphylococci, which divide along multiple axes, thereby generating irregular, grape-like clusters of cells. Most streptococci are oxidase-negative and catalase-negative, and many are facultative anaerobes (capable of growth both aerobically and anaerobically). The term was coined in 1877 by Viennese surgeon Albert Theodor Billroth (1829–1894), by combining the prefix "strepto-" (from ), together with the suffix "-coccus" (from Modern , from .) In 1984, many bacteria formerly grouped in the genus ''Streptococcus'' were separated out into the genera '' Enterococcus'' and '' Lactococcus''. Currently, over 50 species are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sepsis
Sepsis is a potentially life-threatening condition that arises when the body's response to infection causes injury to its own tissues and organs. This initial stage of sepsis is followed by suppression of the immune system. Common signs and symptoms include fever, tachycardia, increased heart rate, hyperventilation, increased breathing rate, and mental confusion, confusion. There may also be symptoms related to a specific infection, such as a cough with pneumonia, or dysuria, painful urination with a pyelonephritis, kidney infection. The very young, old, and people with a immunodeficiency, weakened immune system may not have any symptoms specific to their infection, and their hypothermia, body temperature may be low or normal instead of constituting a fever. Severe sepsis may cause organ dysfunction and significantly reduced blood flow. The presence of Hypotension, low blood pressure, high blood Lactic acid, lactate, or Oliguria, low urine output may suggest poor blood flow. Se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optical Decay
Optical decay is process of relaxation of excitation of an excited quantum system, usually due to the spontaneous emission of a photon or a phonon. Optical decay is dominant mechanism of quenching of excitation of active optical media. In solid-state lasers the optical decay limits the storage of energy in active medium. Also, the term optical decay is used to the effect of quick reduction of luminosity of astrophysical objects http://edoc.mpg.de/199219 Phenomenology of optical decay In the first approximation, the optical decay can be treated as just spontaneous emission, and its rate is determined with the Einstein Coefficients. For the most of laser systems, the effects of decoherence determine the spectral width of the emitted photons, and there is no reason to consider in detail the evolution of isolated quantum-mechanical systems which show the optical decay. Shape of spectral line at the optical decay of an idealized atom The "isolated" quantum system (atom, ion, molecu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
JETP
A Just Energy Transition Partnership (JETP) is a financing cooperation mechanism to help a heavily coal-dependent emerging economy make a just energy transition An energy transition (or energy system transformation) is a major structural change to energy supply and consumption in an energy system. Currently, a transition to sustainable energy is underway to limit climate change. Most of the sustainab ... away from coal. Countries Indonesia Senegal This was announced in 2023. South Africa Vietnam This was announced in 2022. References {{reflist Finance Coal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doctor Of Science
A Doctor of Science (; most commonly abbreviated DSc or ScD) is a science doctorate awarded in a number of countries throughout the world. Africa Algeria and Morocco In Algeria, Morocco, Libya and Tunisia, all universities accredited by the state award a "Doctorate" in all fields of science and humanities, equivalent to a PhD in the United Kingdom or United States. Some universities in these four North African countries award a "Doctorate of the State" in some fields of study and science. A "Doctorate of the State" is slightly higher in esteem than a regular doctorate, and is awarded after performing additional in-depth post-doctorate research or achievement. Asia Japan Similarly to in the US and most of Europe, Japanese universities offer both the PhD and the ScD as initial doctorates in science. India In India only a few prestigious universities offer ScD/DSc in science which is obtained in Graduate School after satisfactory evaluation of knowledge, research accomp ... [...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] |
Ioffe Institute
The Ioffe Physical-Technical Institute of the Russian Academy of Sciences (for short, Ioffe Institute, ) is one of Russia's largest research centers specialized in physics and technology. The institute was established in 1918 in Petrograd (now St. Petersburg) and run for several decades by Abram Ioffe. The institute is a member of the Russian Academy of Sciences. As of June 2024 the Ioffe Institute employed 1977 individuals including both scientific and non-scientific staff. Present structure of the institute As of 2019, the Ioffe institute employed about 1500 people, around 1000 of whom were scientific researchers (including 560 with a PhD degree and 250 with a Doktor Nauk degree). Most of the research staff members are top graduates of the St. Petersburg (former Leningrad) universities. From 2013 until mid-May 2018 the Ioffe institute was under formal jurisdiction of the Federal Agency for Scientific Organizations (FASO Russia), now it is under jurisdiction of the established ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kazan
Kazan; , IPA: Help:IPA/Tatar, [qɑzan] is the largest city and capital city, capital of Tatarstan, Russia. The city lies at the confluence of the Volga and the Kazanka (river), Kazanka Rivers, covering an area of , with a population of over 1.3 million residents, and up to nearly 2 million residents in the greater Kazan metropolitan area, metropolitan area. Kazan is the List of cities and towns in Russia by population, fifth-largest city in Russia, being the Volga#Biggest cities on the shores of the Volga, most populous city on the Volga, as well as within the Volga Federal District. Historically, Kazan was the capital of the Khanate of Kazan, and was Siege of Kazan, conquered by Ivan the Terrible in the 16th century, at which point the city became a part of the Tsardom of Russia. The city was seized (and largely destroyed) during Pugachev's Rebellion (1773–1775), but was later rebuilt during the reign of Catherine the Great. In the following centuries, Kazan grew to become a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siege Of Leningrad
The siege of Leningrad was a Siege, military blockade undertaken by the Axis powers against the city of Leningrad (present-day Saint Petersburg) in the Soviet Union on the Eastern Front (World War II), Eastern Front of World War II from 1941 to 1944. Leningrad, the country's second largest city, was besieged by Nazi Germany, Germany and Finland for 872 days, but never captured. The siege was the List of sieges, most destructive in history and possibly the List of battles by casualties#Sieges and urban combat, most deadly, causing an estimated 1.5 million deaths, from a prewar population of 3.2 million. It was not classified as a war crime at the time, but some historians have since classified it as a genocide due to the intentional destruction of the city and the systematic starvation of its civilian population. p. 334 In August 1941, Nazi Germany, Germany's Army Group North reached the suburbs of Leningrad as Finnish forces moved to encircle the city from the north. Land ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
