Institution
Chelyabinsk State University
Education•Chelyabinsk, Russia•
About: Chelyabinsk State University is a education organization based out in Chelyabinsk, Russia. It is known for research contribution in the topics: Phase transition & Ferromagnetism. The organization has 1098 authors who have published 1679 publications receiving 12504 citations.
Papers published on a yearly basis
Papers
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Russian Academy of Sciences1, Ames Research Center2, Search for extraterrestrial intelligence3, South Ural State University4, Chelyabinsk State University5, Ural Federal University6, University of California, Davis7, University of Helsinki8, Royal Netherlands Meteorological Institute9, Delft University of Technology10, Tomsk State University11, University of Oslo12, Fordham University13, American Museum of Natural History14, Jacobs Engineering Group15, University of New Mexico16, Tohoku University17, Korean Ocean Research and Development Institute18, Chinese Academy of Sciences19, Brown University20, Technische Universität München21, University of Tokyo22, Waseda University23
TL;DR: The asteroid impact near the Russian city of Chelyabinsk on 15 February 2013 was the largest airburst on Earth since the 1908 Tunguska event, causing a natural disaster in an area with a population exceeding one million.
Abstract: The asteroid impact near the Russian city of Chelyabinsk on 15 February 2013 was the largest airburst on Earth since the 1908 Tunguska event, causing a natural disaster in an area with a population exceeding one million. Because it occurred in an era with modern consumer electronics, field sensors, and laboratory techniques, unprecedented measurements were made of the impact event and the meteoroid that caused it. Here, we document the account of what happened, as understood now, using comprehensive data obtained from astronomy, planetary science, geophysics, meteorology, meteoritics, and cosmochemistry and from social science surveys. A good understanding of the Chelyabinsk incident provides an opportunity to calibrate the event, with implications for the study of near-Earth objects and developing hazard mitigation strategies for planetary protection.
560 citations
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TL;DR: In this article, a phase diagram of the cubic ferromagnet describing possible structural and magnetic transitions is obtained theoretically and an estimate of the magnetic field influence on the temperature of martensitic transformation in the studied alloys is given.
Abstract: The Heusler-type alloy ${\mathrm{Ni}}_{2+x}{\mathrm{Mn}}_{1\ensuremath{-}x}\mathrm{Ga}$ exhibits well defined shape memory properties in a ferromagnetic state, which means that the martensitic transition temperature is lower than the Curie point of this material. The change of composition makes these characteristic temperatures approach each other. To study this behavior, the measurements of specific heat, ac magnetic susceptibility, and dc resistivity were performed. The phase diagram of the cubic ferromagnet describing possible structural and magnetic transitions is obtained theoretically. This diagram is compared with experimental data on ${\mathrm{Ni}}_{2+x}{\mathrm{Mn}}_{1\ensuremath{-}x}\mathrm{Ga}.$ An estimate is given of the magnetic-field influence on the temperature of martensitic transformation in the studied alloys.
394 citations
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Harvard University1, Radcliffe Institute for Advanced Study2, Broad Institute3, University of California, Berkeley4, Howard Hughes Medical Institute5, Massachusetts Institute of Technology6, Sapienza University of Rome7, University of Padua8, Queen's University Belfast9, Russian Academy of Sciences10, Al-Farabi University11, University of Pennsylvania12, University College Dublin13, University of Vienna14, Pennsylvania State University15, Max Planck Society16, Birbal Sahni Institute of Palaeobotany17, Centre for Cellular and Molecular Biology18, Emory University19, Centre national de la recherche scientifique20, Kyrgyz National University21, Altai State University22, Academy of Sciences of the Czech Republic23, University of Oxford24, South Ural State University25, Kemerovo State University26, Northwest University (China)27, University College London28, University of Pittsburgh29, Samara State University30, Chelyabinsk State University31, University of Bologna32, Academy of Sciences of Uzbekistan33, University of Winnipeg34, Simon Fraser University35, National Museum of Natural History36, Tomsk State University37, Naturhistorisches Museum38, Národní muzeum39, Hazara University40, Deccan College Post-Graduate and Research Institute41, Pompeu Fabra University42, Hartwick College43, University of California, Santa Barbara44, Washington University in St. Louis45
TL;DR: It is shown that Steppe ancestry then integrated further south in the first half of the second millennium BCE, contributing up to 30% of the ancestry of modern groups in South Asia, supporting the idea that the archaeologically documented dispersal of domesticates was accompanied by the spread of people from multiple centers of domestication.
Abstract: By sequencing 523 ancient humans, we show that the primary source of ancestry in modern South Asians is a prehistoric genetic gradient between people related to early hunter-gatherers of Iran and Southeast Asia. After the Indus Valley Civilization's decline, its people mixed with individuals in the southeast to form one of the two main ancestral populations of South Asia, whose direct descendants live in southern India. Simultaneously, they mixed with descendants of Steppe pastoralists who, starting around 4000 years ago, spread via Central Asia to form the other main ancestral population. The Steppe ancestry in South Asia has the same profile as that in Bronze Age Eastern Europe, tracking a movement of people that affected both regions and that likely spread the distinctive features shared between Indo-Iranian and Balto-Slavic languages.
354 citations
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TL;DR: In this article, the authors have modelled the phase diagram of magnetic shape memory alloys of the Heusler type by using the phenomenological Ginzburg-Landau theory and found that the driving force for structural transformations is considerably enhanced by the extremely low lying optical modes of Ni, which interfere with the acoustical modes enhancing phonon softening of the TA2 mode.
Abstract: We have modelled the phase diagram of magnetic shape memory alloys of the Heusler type by using the phenomenological Ginzburg–Landau theory. When fixing the parameters by realistic values taken from experiment we are able to reproduce most details of, for example, the phase diagram of Ni2+xMn1−xGa in the (T, x) plane. We present the results of ab initio calculations of the electronic and phonon properties of several ferromagnetic Heusler alloys, which allow one to characterize the structural changes associated with the martensitic instability leading to the modulated and tetragonal phases. From the ab initio investigations emerges a complex pattern of the interplay of magic valence electron per atom numbers (Hume–Rothery rules for magnetic ternary alloys), Fermi surface nesting and phonon instability. As the main result, we find that the driving force for structural transformations is considerably enhanced by the extremely low lying optical modes of Ni in the Ni-based Heusler alloys, which interfere with the acoustical modes enhancing phonon softening of the TA2 mode. In contrast, the ferromagnetic Co-based Heusler alloys show no tendency for phonon softening.
297 citations
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TL;DR: In the case of ferromagnetic Heusler alloys Ni2+xMn1-xGa single crystals, a reversible strain of 6% was obtained in fields of 1 T.
Abstract: In ferromagnetic alloys with shape memory large reversible strains can be obtained by rearranging the martensitic domain structure by a magnetic field. Magnetization through displacement of domain walls is possible in the presence of high magnetocrystalline anisotropy, when martensitic structure rearrangement is energetically favorable compared to the reorientation of magnetic moments. In ferromagnetic Heusler alloys Ni2+xMn1–xGa the Curie temperature exceeds the martensitic transformation temperature. The fact that these two temperatures are close to room temperature offers the possibility of magnetically controlling the shape and size of ferromagnets in the martensitic state. In Ni2+xMn1–xGa single crystals, a reversible strain of ~6% is obtained in fields of ~1 T.
265 citations
Authors
Showing all 1144 results
Name | H-index | Papers | Citations |
---|---|---|---|
Peter Entel | 43 | 379 | 8367 |
Vladimir Turaev | 39 | 150 | 10573 |
Konstantin P. Skokov | 38 | 175 | 4993 |
Vladimir E. Fedorov | 38 | 383 | 4930 |
An. Morozov | 37 | 66 | 4541 |
Anatoliĭ Timofeevich Fomenko | 36 | 158 | 5358 |
Vladimir G. Tsirelson | 35 | 173 | 4465 |
A. Alan Pinkerton | 35 | 193 | 3864 |
Oleg N. Chupakhin | 34 | 713 | 5847 |
Vladimir S. Matveev | 31 | 174 | 2875 |
Adam I. Stash | 26 | 176 | 2312 |
Vasiliy D. Buchelnikov | 25 | 166 | 2661 |
Alexey T. Zayak | 23 | 68 | 1973 |
Amar Debbouche | 23 | 69 | 1465 |
Salvatore Guccione | 23 | 96 | 1576 |