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Yury Mikhailovich Bunkov
Yury (or Yuriy or Yuri) Mikhailovich Bunkov (Юрий Михайлович Буньков, 29 August 1950 in Stavropol) is a Russian experimental physicist, specializing in condensed matter physics. He is known as one of the co-discoverers of the quantum spin liquid state. Education and career Bunkov, born into a family of geologists, graduated in 1968 from a special school for physics and mathematics in Moscow (School No. 2). In 1968 he also achieved first place in the Moscow Physics Olympiad and matriculated at the Moscow Institute of Physics and Technology (MIPT), which was headed by Piotr Kapitza. According to Bunkov, the "parametric echo" should be called the "Bunkov echo": In 1974 he matriculated at the Kapitza Institute for Physical Problems, where he received in 1979 his Candidate of Sciences degree (Ph.D.). A. S. Borovik-Romanov was Bunkov's thesis advisor. At the Kapitza Institute for Physical Problems, he was employed as a non-principal scientist from 1979 to 1985, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stavropol
Stavropol (, ), known as Voroshilovsk from 1935 until 1943, is a city and the administrative centre of Stavropol Krai, in southern Russia. As of the 2021 Census, its population was 547,820, making it one of Russia's fastest growing cities. Etymology The name ''Stavropol'' () is a Russian rendering of the Greek name, ( 'City of the Cross'). According to legend, soldiers found a stone cross there while building the fortress in the city's future location. It is not related to Byzantine Stauroupolis (ancient Aphrodisias) in Asia Minor, nor to the city of Stavropol-on-Volga (now called Tolyatti). History It was founded on October 22, 1777Charter of Stavropol, Article 2 following the Russo-Turkish War of 1768–1774 as a military encampment, and was granted city status in 1785. Prince Grigory Potemkin, who founded Stavropol as one of ten fortresses built between Azov and Mozdok at the request of Catherine the Great, played a leading role in the creation of the city ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
French National Centre For Scientific Research
The French National Centre for Scientific Research (, , CNRS) is the French state research organisation and is the largest fundamental science agency in Europe. In 2016, it employed 31,637 staff, including 11,137 tenured researchers, 13,415 engineers and technical staff, and 7,085 contractual workers. It is headquartered in Paris and has administrative offices in Brussels, Beijing, Tokyo, Singapore, Washington, D.C., Bonn, Moscow, Tunis, Johannesburg, Santiago de Chile, Israel, and New Delhi. Organization The CNRS operates on the basis of research units, which are of two kinds: "proper units" (UPRs) are operated solely by the CNRS, and Joint Research Unit, Joint Research Units (UMRs – ) are run in association with other institutions, such as List of colleges and universities in France, universities or INSERM. Members of Joint Research Units may be either CNRS researchers or university employees (Academic ranks in France, ''maîtres de conférences'' or ''professeurs''). Each ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
State Prize Of The Russian Federation
The State Prize of the Russian Federation, officially translated in Russia as Russian Federation National Award, is a state honorary prize established in 1992 following the breakup of the Soviet Union. In 2004 the rules for selection of laureates and the status of the award were significantly changed, making them closer to such awards as the Nobel Prize or the Soviet Lenin Prize.Order of President of Russian Federation N785 on reform of state awards 21 June 2004 Every year seven prizes are awarded: * Three prizes in science and technology (according to newspaper there was a fourth 2008 State Prize for Science and Technology awarded by a sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hirsch Index
The ''h''-index is an author-level metric that measures both the productivity and citation impact of the publications, initially used for an individual scientist or scholar. The ''h''-index correlates with success indicators such as winning the Nobel Prize, being accepted for research fellowships and holding positions at top universities. The index is based on the set of the scientist's most cited papers and the number of citations that they have received in other publications. The index has more recently been applied to the productivity and impact of a scholarly journal as well as a group of scientists, such as a department or university or country. The index was suggested in 2005 by Jorge E. Hirsch, a physicist at UC San Diego, as a tool for determining theoretical physicists' relative quality and is sometimes called the Hirsch index or Hirsch number. Hirsch intended the ''h''-index to address the main disadvantages of other bibliometric indicators. The total number of papers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dark Matter
In astronomy, dark matter is an invisible and hypothetical form of matter that does not interact with light or other electromagnetic radiation. Dark matter is implied by gravity, gravitational effects that cannot be explained by general relativity unless more matter is present than can be observed. Such effects occur in the context of Galaxy formation and evolution, formation and evolution of galaxies, gravitational lensing, the observable universe's current structure, mass position in galactic collisions, the motion of galaxies within galaxy clusters, and cosmic microwave background Anisotropy, anisotropies. Dark matter is thought to serve as gravitational scaffolding for cosmic structures. After the Big Bang, dark matter clumped into blobs along narrow filaments with superclusters of galaxies forming a cosmic web at scales on which entire galaxies appear like tiny particles. In the standard Lambda-CDM model of cosmology, the mass–energy equivalence, mass–energy content o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aerogel
Aerogels are a class of manufacturing, synthetic porous ultralight material derived from a gel, in which the liquid component for the gel has been replaced with a gas, without significant collapse of the gel structure. The result is a solid with extremely low density and extremely low thermal conductivity. Aerogels can be made from a variety of chemical compounds. Silica aerogels feel like fragile expanded polystyrene, styrofoam to the touch, while some polymer-based aerogels feel like rigid foams. Aerogels are produced by extracting the liquid component of a gel through supercritical drying or freeze-drying. This allows the liquid to be slowly dried off without causing the solid matrix in the gel to collapse from capillary action, as would happen with conventional evaporation. The first aerogels were produced from silica gels. Kistler's later work involved aerogels based on alumina, Chromium(III) oxide, chromia, and tin dioxide. Carbon aerogels were first developed in the late ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anisotropy
Anisotropy () is the structural property of non-uniformity in different directions, as opposed to isotropy. An anisotropic object or pattern has properties that differ according to direction of measurement. For example, many materials exhibit very different physical or mechanical properties when measured along different axes, e.g. absorbance, refractive index, conductivity, and tensile strength. An example of anisotropy is light coming through a polarizer. Another is wood, which is easier to split along its grain than across it because of the directional non-uniformity of the grain (the grain is the same in one direction, not all directions). Fields of interest Computer graphics In the field of computer graphics, an anisotropic surface changes in appearance as it rotates about its geometric normal, as is the case with velvet. Anisotropic filtering (AF) is a method of enhancing the image quality of textures on surfaces that are far away and viewed at a shallow angle. Older ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grigori Efimovich Volovik
Grigory (or Grigori or Grigorii) Efimovich Volovik (Григорий Ефимович Воловик; born 7 September 1946 in Moscow) is a Russian theoretical physicist, who specializes in condensed matter physics. He is known for the Volovik effect. Education and career After graduating in 1970 from the Moscow Institute of Physics and Technology, Volovik became a graduate student at Moscow's Landau Institute for Theoretical Physics, where his received his Russian Candidate of Science degree (Ph.D.) in 1973. His thesis was on ''Dynamics of a particle strongly interacting with a Bose System''. He has held since 1973 an appointment as a staff member of the Landau Institute and since 1993 a simultaneous appointment as a professor at the Low Temperature Laboratory (now called the Olli Lounasmaa Laboratory) at the Helsinki University of Technology (now called Aalto University). In 1981 he received from the Landau Institute his Russian Doctor of Sciences degree (habilitation). His Russia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soliton
In mathematics and physics, a soliton is a nonlinear, self-reinforcing, localized wave packet that is , in that it preserves its shape while propagating freely, at constant velocity, and recovers it even after collisions with other such localized wave packets. Its remarkable stability can be traced to a balanced cancellation of nonlinear and dispersive effects in the medium.Dispersive effects are a property of certain systems where the speed of a wave depends on its frequency. Solitons were subsequently found to provide stable solutions of a wide class of weakly nonlinear dispersive partial differential equations describing physical systems. The soliton phenomenon was first described in 1834 by John Scott Russell who observed a solitary wave in the Union Canal in Scotland. He reproduced the phenomenon in a wave tank and named it the " Wave of Translation". The Korteweg–de Vries equation was later formulated to model such waves, and the term "soliton" was coined by Zabu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Q-ball
In theoretical physics, Q-ball is a type of non-topological soliton. A soliton is a localized field configuration that is stable—it cannot spread out and dissipate. In the case of a non-topological soliton, the stability is guaranteed by a conserved charge: the soliton has lower energy per unit charge than any other configuration (in physics, charge is often represented by the letter "Q", and the soliton is spherically symmetric, hence the name). Intuitive explanation A Q-ball arises in a theory of bosonic particles when there is an attraction between the particles. Loosely speaking, the Q-ball is a finite-sized "blob" containing a large number of particles. The blob is stable against fission into smaller blobs and against "evaporation" via emission of individual particles, because, due to the attractive interaction, the blob is the lowest-energy configuration of that number of particles. (This is analogous to the fact that nickel-62 is the most stable nucleus because it is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Second Sound
In condensed matter physics, second sound is a quantum mechanical phenomenon in which heat transfer occurs by wave-like motion, rather than by the more usual mechanism of diffusion. Its presence leads to a very high thermal conductivity. It is known as "second sound" because the wave motion of entropy and temperature is similar to the propagation of pressure waves in air (sound). The phenomenon of second sound was first described by Lev Landau in 1941. Description Normal sound waves are fluctuations in the displacement and density of molecules in a substance; second sound waves are fluctuations in the density of quasiparticle thermal excitations ( rotons and phonons). Second sound can be observed in any system in which most phonon-phonon collisions conserve momentum, like superfluids and in some dielectric crystals when Umklapp scattering is small. Contrary to molecules in a gas, quasiparticles are not necessarily conserved. Also gas molecules in a box conserve momentum (e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cooper Pair
In condensed matter physics, a Cooper pair or BCS pair (Bardeen–Cooper–Schrieffer pair) is a pair of electrons (or other fermions) bound together at low temperatures in a certain manner first described in 1956 by American physicist Leon Cooper. Description Cooper showed that an arbitrarily small attraction between electrons in a metal can cause a paired state of electrons to have a lower energy than the Fermi energy, which implies that the pair is bound. In conventional superconductors, this attraction is due to the electron–phonon interaction. The Cooper pair state is responsible for superconductivity, as described in the BCS theory developed by John Bardeen, Leon Cooper, and John Schrieffer for which they shared the 1972 Nobel Prize in Physics. Although Cooper pairing is a quantum effect, the reason for the pairing can be seen from a simplified classical explanation. An electron in a metal normally behaves as a free particle. The electron is repelled from other electrons ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
