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Vladimir Pokrovskii
Vladimir Nikolajevich Pokrovskii (russian: Влад’имир Никол’аевич Покр’овский; born 11 May 1934) is a Russian scientist known for his original contributions to polymer physics and economic theory. He was the founder of the Altai (Russia, Barnaul) school of dynamics of nonlinear fluids (Yurii Altukhov, Grigorii Pyshnograi and others). Biography Pokrovskii was born May 11, 1934 into a Russian family in the rural locality Altayskoye, Altaysky District, Altai Krai (Russian: Алтайское, Алтайского края), Russia. He graduated from Tomsk State University in Siberia as a physicist (Department of Theoretical Physics) in 1958 and in the same year was employed as a teacher of physics at Tomsk Polytechnic University. In 1964 he moved to the Branch of Institute of Chemical Physics of the Academy of Sciences of the USSR (Chernogolovka, Moscow region) where in positions of Senior Research Fellow was engaged in studying of suspensi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Altayskoye, Altaysky District, Altai Krai
Altayskoye (russian: Алтайское) is a types of inhabited localities in Russia, rural locality (a Village#Russia, selo) and the administrative center of Altaysky District, Altai Krai, Altaysky District of Altai Krai, Russia. Population: References Notes Sources * * {{Authority control Rural localities in Altaysky District, Altai Krai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Complex Fluid
Complex fluids are mixtures that have a coexistence between two Phase (matter) , phases: solid–liquid (Suspension (chemistry) , suspensions or solutions of macromolecules such as polymers), solid–gas (Granular material, granular), liquid–gas (foams) or liquid–liquid (emulsions). They exhibit unusual mechanical responses to applied Stress (physics) , stress or Strain (materials science) , strain due to the geometrical constraints that the phase coexistence imposes. The mechanical response includes transitions between solid-like and fluid-like behavior as well as fluctuations. Their mechanical properties can be attributed to characteristics such as high disorder, caging, and clustering on multiple length scales. Example Shaving cream is an example of a complex fluid. Without stress, the foam appears to be a solid: it does not flow and can support (very) light Structural load , loads. However, when adequate stress is applied, shaving cream flows easily like a fluid. On ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Political Economy
Political economy is the study of how Macroeconomics, economic systems (e.g. Marketplace, markets and Economy, national economies) and Politics, political systems (e.g. law, Institution, institutions, government) are linked. Widely studied phenomena within the discipline are systems such as Market economy, labour markets and Financial market, financial markets, as well as phenomena such as Economic growth, growth, Distribution of wealth, distribution, Economic inequality, inequality, and International trade, trade, and how these are shaped by institutions, laws, and government policy. Originating in the 16th century, it is the precursor to the modern discipline of economics. Political economy in its modern form is considered an interdisciplinary field, drawing on theory from both political science and Neoclassical economics, modern economics. Political economy originated within 16th century western Ethics, moral philosophy, with theoretical works exploring the administration ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Technological Theory Of Social Production
In the technological theory of social production, the growth of output, measured in money units, is related to achievements in technological consumption of labour and energy. This theory is based on concepts of classical political economy and neo-classical economics and appears to be a generalisation of the known economic models, such as the neo-classical model of economic growth and input-output model. The main relations of the theory The major characteristics of social production is its output Y, that is production of value in unit of time, the original sources of which are production factors, which are some universal characteristics of production processes. In classical political economy (Smith, Marx, Ricardo), it is human efforts (labour) L, which are measured in working hours. Neoclassical practice G.W. Cobb and P.N. Douglas, A Theory of Production, American Economic Review, Suppl. (March 1928), pp. 139-165.R. Solow, Technical Change and the Aggregate Production Funct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Econodynamics
Econodynamics is an empirical science that studies emergences, motion and disappearance of value—a specific concept that is used for description of the processes of creation and distribution of wealth. Any economic theory deals with the interpretation of economic processes based on the law of production of value, and various scientific approaches differ in the choice of factors of production that determine, in the end, the creation of wealth. Marxists insist that only labor creates value, neoclassicists believe that, in addition to labor, capital must also be taken into account as the important source of value. Econodynamics demonstrates that the statement about the productive power of capital is a hoax that hides the real role of labor and energy in the production of value. Econodynamics offers a more adequate interpretation of economic growth and other phenomena.Econodynamics is based on the achievements of classical political economy and neo-classical economics and has been ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Viscoelasticity
In materials science and continuum mechanics, viscoelasticity is the property of materials that exhibit both viscous and elastic characteristics when undergoing deformation. Viscous materials, like water, resist shear flow and strain linearly with time when a stress is applied. Elastic materials strain when stretched and immediately return to their original state once the stress is removed. Viscoelastic materials have elements of both of these properties and, as such, exhibit time-dependent strain. Whereas elasticity is usually the result of bond stretching along crystallographic planes in an ordered solid, viscosity is the result of the diffusion of atoms or molecules inside an amorphous material.Meyers and Chawla (1999): "Mechanical Behavior of Materials", 98-103. Background In the nineteenth century, physicists such as Maxwell, Boltzmann, and Kelvin researched and experimented with creep and recovery of glasses, metals, and rubbers. Viscoelasticity was further examined in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macromolecules
A macromolecule is a very large molecule important to biophysical processes, such as a protein or nucleic acid. It is composed of thousands of covalently bonded atoms. Many macromolecules are polymers of smaller molecules called monomers. The most common macromolecules in biochemistry are biopolymers (nucleic acids, proteins, and carbohydrates) and large non-polymeric molecules such as lipids, nanogels and macrocycles. Synthetic fibers and experimental materials such as carbon nanotubes are also examples of macromolecules. Definition The term ''macromolecule'' (''macro-'' + ''molecule'') was coined by Nobel laureate Hermann Staudinger in the 1920s, although his first relevant publication on this field only mentions ''high molecular compounds'' (in excess of 1,000 atoms). At that time the term ''polymer'', as introduced by Berzelius in 1832, had a different meaning from that of today: it simply was another form of isomerism for example with benzene and acetylene and had little ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thermal Motion
A thermal column (or thermal) is a rising mass of buoyant air, a convective current in the atmosphere, that transfers heat energy vertically. Thermals are created by the uneven heating of Earth's surface from solar radiation, and are an example of convection, specifically atmospheric convection. Thermals on Earth The Sun warms the ground, which in turn warms the air directly above. The warm air near the surface expands, becoming less dense than the surrounding air. The lighter air rises and cools due to its expansion in the lower pressure at higher altitudes. It stops rising when it has cooled to the same temperature, thus density, as the surrounding air. Associated with a thermal is a downward flow surrounding the thermal column. The downward-moving exterior is caused by colder air being displaced at the top of the thermal. The size and strength of thermals are influenced by the properties of the lower atmosphere (the ''troposphere''). When the air is cold, bubbles of warm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reptation
A peculiarity of thermal motion of very long linear macromolecules in ''entangled'' polymer melts or concentrated polymer solutions is reptation. Derived from the word reptile, reptation suggests the movement of entangled polymer chains as being analogous to snakes slithering through one another. Pierre-Gilles de Gennes introduced (and named) the concept of reptation into polymer physics in 1971 to explain the dependence of the mobility of a macromolecule on its length. Reptation is used as a mechanism to explain viscous flow in an amorphous polymer. Sir Sam Edwards and Masao Doi later refined reptation theory. Similar phenomena also occur in proteins. Two closely related concepts are reptons and entanglement. A repton is a mobile point residing in the cells of a lattice, connected by bonds. Entanglement means the topological restriction of molecular motion by other chains. Theory and mechanism Reptation theory describes the effect of polymer chain entanglements on the relati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pierre-Gilles De Gennes
Pierre-Gilles de Gennes (; 24 October 1932 – 18 May 2007) was a French physicist and the Nobel Prize laureate in physics in 1991. Education and early life He was born in Paris, France, and was home-schooled to the age of 12. By the age of 13, he had adopted adult reading habits and was visiting museums. Later, de Gennes studied at the École Normale Supérieure. After leaving the ''École'' in 1955, he became a research engineer at the Saclay center of the Commissariat à l'Énergie Atomique, working mainly on neutron scattering and magnetism, with advice from Anatole Abragam and Jacques Friedel. He defended his Ph.D. in 1957 at the University of Paris. Career and research In 1959, he was a postdoctoral research visitor with Charles Kittel at the University of California, Berkeley, and then spent 27 months in the French Navy. In 1961, he was assistant professor in Orsay and soon started the Orsay group on superconductors. In 1968, he switched to studying liquid crystals. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sam Edwards (physicist)
Sir Samuel Frederick Edwards (1 February 1928 – 7 May 2015) was a Welsh physicist. The Sam Edwards Medal and Prize is named in his honour. Early life and studies Edwards was born on 1 February 1928 in Swansea, Wales, the son of Richard and Mary Jane Edwards. He was educated at the Bishop Gore School, Swansea, and Gonville and Caius College, Cambridge, the University of Manchester, and at Harvard University, in the United States. He wrote his thesis under Julian Schwinger on the structure of the electron, and subsequently developed the functional integral form of field theory. Academic research Edwards's work in condensed matter physics started in 1958 with a paper which showed that statistical properties of disordered systems (glasses, gels etc.) could be described by the Feynman diagram and path integral methods invented in quantum field theory. During the following 35 years Edwards worked in the theoretical study of complex materials, such as polymers, gels, colloids and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polymers
A polymer (; Greek '' poly-'', "many" + ''-mer'', "part") is a substance or material consisting of very large molecules called macromolecules, composed of many repeating subunits. Due to their broad spectrum of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. Polymers range from familiar synthetic plastics such as polystyrene to natural biopolymers such as DNA and proteins that are fundamental to biological structure and function. Polymers, both natural and synthetic, are created via polymerization of many small molecules, known as monomers. Their consequently large molecular mass, relative to small molecule compounds, produces unique physical properties including toughness, high elasticity, viscoelasticity, and a tendency to form amorphous and semicrystalline structures rather than crystals. The term "polymer" derives from the Greek word πολύς (''polus'', meaning "many, much") and μέρος (''meros'', meani ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
