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Sample records for rankis artjoms lebedevs

  1. CONFERENCES AND SYMPOSIA: P N Lebedev Physical Institute RAS: past, present, and future

    NASA Astrophysics Data System (ADS)

    Mesyats, Gennadii A.

    2009-11-01

    This paper reviews the history of the P N Lebedev Physical Institute of the Russian Academy of Sciences (FIAN in Russ. abbr.). Major achievements of FIAN scientists are discussed, current activities are described, and future prospects are outlined.

  2. ToxCast EPA in Vitro to in Vivo Challenge: Insight into the Rank-I Model.

    PubMed

    Novotarskyi, Sergii; Abdelaziz, Ahmed; Sushko, Yurii; Körner, Robert; Vogt, Joachim; Tetko, Igor V

    2016-05-16

    The ToxCast EPA challenge was managed by TopCoder in Spring 2014. The goal of the challenge was to develop a model to predict the lowest effect level (LEL) concentration based on in vitro measurements and calculated in silico descriptors. This article summarizes the computational steps used to develop the Rank-I model, which calculated the lowest prediction error for the secret test data set of the challenge. The model was developed using the publicly available Online CHEmical database and Modeling environment (OCHEM), and it is freely available at http://ochem.eu/article/68104 . Surprisingly, this model does not use any in vitro measurements. The logic of the decision steps used to develop the model and the reason to skip inclusion of in vitro measurements is described. We also show that inclusion of in vitro assays would not improve the accuracy of the model. PMID:27120770

  3. N.G. Basov and early works on semiconductor lasers at P.N. Lebedev Physics Institute

    SciTech Connect

    Eliseev, P G

    2012-12-31

    A survey is presented of works on creation and investigation of semiconductor lasers during 1957 - 1977 at the P.N. Lebedev Physics Institute. Many of these works were initiated by N.G. Basov, starting from pre-laser time, when N.G. Basov and his coworkers formulated principal conditions of creation of lasers on interband transitions in semiconductors. Main directions of further works were diode lasers based on various materials and structures, their characteristics of output power, high-speed operation and reliability. (special issue devoted to the 90th anniversary of n.g. basov)

  4. On the chemistry of ethanol on basic oxides: revising mechanisms and intermediates in the Lebedev and Guerbet reactions.

    PubMed

    Chieregato, Alessandro; Velasquez Ochoa, Juliana; Bandinelli, Claudia; Fornasari, Giuseppe; Cavani, Fabrizio; Mella, Massimo

    2015-01-01

    A common way to convert ethanol into chemicals is by upgrading it over oxide catalysts with basic features; this method makes it possible to obtain important chemicals such as 1-butanol (Guerbet reaction) and 1,3-butadiene (Lebedev reaction). Despite their long history in chemistry, the details of the close inter-relationship of these reactions have yet to be discussed properly. Our present study focuses on reactivity tests, in situ diffuse reflectance infrared Fourier transform spectroscopy, MS analysis, and theoretical modeling. We used MgO as a reference catalyst with pure basic features to explore ethanol conversion from its very early stages. Based on the obtained results, we formulate a new mechanistic theory able to explain not only our results but also most of the scientific literature on Lebedev and Guerbet chemistry. This provides a rational description of the intermediates shared by the two reaction pathways as well as an innovative perspective on the catalyst requirements to direct the reaction pathway toward 1-butanol or butadiene. PMID:25504787

  5. "As I deeply understand the importance and greatly admire the poetry of experiment..." (on the eve of P N Lebedev's anniversary)

    NASA Astrophysics Data System (ADS)

    Shcherbakov, R. N.

    2016-02-01

    Whatever we think of the eminent Russian physicist P N Lebedev, whatever our understanding of how his work was affected by circumstances in and outside of Russia, whatever value is placed on the basic elements of his twenty-year career and personal life and of his great successes and, happily, not so great failures, and whatever the stories of his happy times and his countless misfortunes, one thing remains clear — P N Lebedev's skill and talent served well to foster the development of global science and to improve the reputation of Russia as a scientific nation.

  6. CONFERENCES AND SYMPOSIA: P N Lebedev Physical Institute RAS — 75 years(Joint session of the P N Lebedev Physical Institute Research Council and the Scientific session of the Physical Sciences Division of the Russian Academy of Sciences and the United Physical Society of the Russian Federation, 6 April 2009)

    NASA Astrophysics Data System (ADS)

    Mesyats, Gennadii A.; Bolotovskii, Boris M.; Kopaev, Yurii V.; Kardashev, Nikolai S.; Zatsepin, Georgii T.; Roganova, Tat'yana M.; Masalov, Anatolii V.; Gubin, Mikhail A.; Velichansky, Vladimir L.; Dagkesamanskii, Rustam D.

    2009-11-01

    A Joint session of the P N Lebedev Physical Institute Research Council of the Academy of Sciences and the Scientific session of the Physical Sciences Division of the Russian Academy of Sciences and the United Physical Society of the Russian Federation was convened on 6 April 2009 to mark the 75th anniversary of the P N Lebedev Physical Institute of the Academy of Sciences (FIAN). The following papers were read to the session: (1) Mesyats G A (P N Lebedev Physical Institute RAS) "75 years of the P N Lebedev Physical Institute RAS which traces back its origin to the Physics Room of Peter the Great's Kunstkamera created 225 years ago"; (2) Bolotovskii B M (Division of Theoretical Physics, P N Lebedev Physical Institute RAS) "Vavilov-Cherenkov radiation"; (3) Kopaev Yu V (Division of Solid State Physics, P N Lebedev Physical Institute RAS) "Toroidal states in crystals"; (4) Kardashev N S (Astro-Cosmic Center of the P N Lebedev Physical Institute RAS) "Science program of the Radioastron mission"; (5) Zatsepin G T (Nuclear Research Institute RAS), Roganova T M (M V Lomonosov Moscow State University, D V Skobeltsyn Nuclear Physics Research Institute) "Cosmic ray studies"; (6) Masalov A V (Optics Division, P N Lebedev Physical Institute RAS) "Spectroscopy: from atoms to cosmic objects"; (7) Gubin M A, Velichansky V L (Division of Quantum Radiophysics, P N Lebedev Physical Institute RAS) "Small-size optical frequency standards"; (8) Dagkesamanskii R D (Radioastronomical Observatory in Pushchino of the Astro-Cosmic Center of the P N Lebedev Physical Institute RAS) "Prospects for radioastronomical research in Pushchino". Articles written on the basis of these talks are printed in this special issue of Uspekhi Fizicheskikh Nauk (Usp. Fiz. Nauk 179 (11) 1145 - 1256 (2009) [English version: Phys. Usp. 52 (11) (2009] journal. • P N Lebedev Physical Institute RAS: past, present, and future, G A Mesyats Physics-Uspekhi, 2009, Volume 52, Number 11, Pages 1084-1097 • Vavilov

  7. Pulsed laser facilities operating from UV to IR at the Gas Laser Lab of the Lebedev Institute

    NASA Astrophysics Data System (ADS)

    Ionin, Andrei; Kholin, Igor; Vasil'Ev, Boris; Zvorykin, Vladimir

    2003-05-01

    Pulsed laser facilities developed at the Gas Lasers Lab of the Lebedev Physics Institute and their applications for different laser-matter interactions are discussed. The lasers operating from UV to mid-IR spectral region are as follows: e-beam pumped KrF laser (λ= 0.248 μm) with output energy 100 J; e-beam sustained discharge CO2(10.6 μm) and fundamental band CO (5-6 μm) lasers with output energy up to ~1 kJ; overtone CO laser (2.5-4.2 μm) with output energy ~ 50 J and N2O laser (10.9 μm) with output energy of 100 J; optically pumped NH3 laser (11-14 μm). Special attention is paid to an e-beam sustained discharge Ar-Xe laser (1.73 μm ~ 100 J) as a potential candidate for a laser-propulsion facility. The high energy laser facilities are used for interaction of laser radiation with polymer materials, metals, graphite, rocks, etc.

  8. Celebrating 50 years of the laser(Joint scientific session of the Physical Sciences Division of the Russian Academy of Sciences and of the Scientific Councils of the P N Lebedev Physical Institute, RAS and the A M Prokhorov General Physics Institute, RAS, 21 April 2010)

    NASA Astrophysics Data System (ADS)

    2011-01-01

    A joint scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) and the scientific councils of the P N Lebedev Physical Institute, RAS and the A M Prokhorov General Physics Institute, RAS dedicated to the 50th anniversary of the advent of the laser was held in the conference hall of the Lebedev Physical Institute on 21 April 2010. The following reports were put on the session's agenda posted on the website www.gpad.ac.ru of the Physical Sciences Division, RAS: (1) Alferov Zh I (A F Ioffe Physical-Technical Institute RAS, St. Petersburg) "Semiconductor heterostructure lasers"; (2) Bagaev S N (Institute of Laser Physics, Siberian Branch, RAS, Novosibirsk) "Ultrahigh-resolution spectra and their fundamental application"; (3) Masalov A V (P N Lebedev Physical Institute, RAS, Moscow) "Optical Department of the Lebedev Physical Institute: early work on lasers"; (4) Garnov S V, Shcherbakov I A (A M Prokhorov General Physics Institute, RAS, Moscow) "Laser sources of megavolt terahertz pulses"; (5) Sergeev A M, Khazanov E A (Institute of Applied Physics, RAS, Nizhny Novgorod) "Structural functions of a developed turbulence"; (6) Popov Yu M (P N Lebedev Physical Institute, RAS, Moscow) "The early history of semiconductor lasers"; (7) Manenkov A A (A M Prokhorov General Physics Institute, RAS, Moscow) "Self-focusing laser pulses: current state and future prospects". The papers written on the basis of reports 3, 4, 6, and 7 are published below. A comprehensive version of report 5 prepared in the form of a review paper is published in this issue of Physics-Uspekhi on p. 9. • Optical Department of the Lebedev Physical Institute: early work on lasers, A V Masalov Physics-Uspekhi, 2011, Volume 54, Number 1, Pages 87-91 • Laser methods for generating megavolt terahertz pulses, S V Garnov, I A Shcherbakov Physics-Uspekhi, 2011, Volume 54, Number 1, Pages 91-96 • The early history of the injection laser, Yu M Popov Physics-Uspekhi, 2011

  9. The 120th anniversary of the birth of Academician D V Skobeltsyn (Joint meeting of the scientific session of the Physical Sciences Division of the Russian Academy of Sciences and the Research Councils of the Lebedev Physical Institute of the Russian Academy of Sciences and of the Skobeltsyn Institute of Nuclear Physics of Lomonosov Moscow State University, 28 November 2012)

    NASA Astrophysics Data System (ADS)

    2013-04-01

    A joint meeting of the scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) and the Research Councils of the Lebedev Physical Institute of the RAS and of the Skobeltsyn Institute of Nuclear Physics of Lomonosov Moscow State University took place at the conference hall of the Lebedev Physical Institute of the RAS on 28 November 2012.The following reports were put on the session agenda as posted on the website http://www.gpad.ac.ru of the RAS Physical Sciences Division:1) Mesyats G A (Lebedev Physical Institute, RAS, Moscow) "Opening remarks"; (2) Sadovnichy V A (Lomonosov Moscow State University, Moscow) "Academician D V Skobeltsyn and Moscow State University"; (3) Dalkarov O D (Lebedev Physical Institute, RAS, Moscow) "Cosmic rays studies at FIAN"; (4) Panasyuk M I, Romanovskii E A (Skobteltsyn Institute of Nuclear Physics of Lomonosov Moscow State University, Moscow) "Academician D V Skobeltsyn -- the founder of the scientific school of nuclear physics at Moscow State University"; (5) Mikhailin V V (Skobeltsyn Institute of Nuclear Physics of Lomonosov Moscow State University, Moscow) "Synchrotron and undulator radiations and their application in spectroscopy"; (6) Toptygin I N (St. Petersburg State Polytechnic University, St. Petersburg) "The Petersburg period in the life of D V Skobeltsyn". Articles based on talks 1, 2, 4-6 are printed below. • Academician D V Skobeltsyn and FIAN, G A Mesyats Physics-Uspekhi, 2013, Volume 56, Number 4, Pages 401-404 • Academician D V Skobeltsyn and Moscow State University, V A Sadovnichy Physics-Uspekhi, 2013, Volume 56, Number 4, Pages 404-406 • Academician D V Skobeltsyn as the founder of the MSU school of nuclear physics, M I Panasyuk, E A Romanovskii Physics-Uspekhi, 2013, Volume 56, Number 4, Pages 406-411 • Synchrotron and undulator radiations and their applications in spectroscopy, V V Mikhailin Physics-Uspekhi, 2013, Volume 56, Number 4, Pages 412-417 • The Petersburg

  10. Data Networking Support Services of Pushchino Radioastronomy Observatory, Astrospace Center of Lebedev Physical Institute

    NASA Astrophysics Data System (ADS)

    Dumsky, D. V.; Isaev, E. A.; Samodurov, V. A.; Likhachev, S. F.; Shatskaya, M. V.; Kitaeva, M. A.; Zaytcev, A. Yu.; Ovchinnikov, I. L.; Kornilov, V. V.

    Growth of local area network Observatory associated with employee needs to access network resources has led to an increase in the number of computing and network devices. Until recently, we tested performance of these systems excellent manual and most of the problems and faults detected already on the fact the accident occurred. For a small number of network nodes, manual monitoring is not a significant problem, but with increasing the number of nodes troubles hooting becomes a very difficult task for network and system administrators and outage in work of network services Observatory may becomes critical. There fore there was a need to automate the monitoring service network resources and servers.

  11. V. S. Lebedev and I. L. Beigman, Physics of Highly Excited Atoms and Ions

    NASA Astrophysics Data System (ADS)

    Mewe, R.

    1999-07-01

    This book contains a comprehensive description of the basic principles of the theoretical spectroscopy and experimental spectroscopic diagnostics of Rydberg atoms and ions, i.e., atoms in highly excited states with a very large principal quantum number (n≫1). Rydberg atoms are characterized by a number of peculiar physical properties as compared to atoms in the ground or a low excited state. They have a very small ionization potential (∝1/n2), the highly excited electron has a small orbital velocity (∝1/n), the radius (∝n2) is very large, the excited electron has a long orbital period (∝n3), and the radiation lifetime is very long (∝n3-5). At the same time the R. atom is very sensitive to perturbations from external fields in collisions with charged and neutral targets. In recent years, R. atoms have been observed in laboratory and cosmic conditions for n up to ˜1000, which means that the size amounts to about 0.1 mm, ˜106 times that of an atom in the ground state. The scope of this monograph is to familiarize the reader with today's approaches and methods for describing isolated R. atoms and ions, radiative transitions between highly excited states, and photoionization and photorecombination processes. The authors present a number of efficient methods for describing the structure and properties of R. atoms and calculating processes of collisions with neutral and charged particles as well as spectral-line broadening and shift of Rydberg atomic series in gases, cool and hot plasmas in laboratories and in astrophysical sources. Particular attention is paid to a comparison of theoretical results with available experimental data. The book contains 9 chapters. Chapter 1 gives an introduction to the basic properties of R. atoms (ions), Chapter 2 is devoted to an account of general methods describing an isolated Rydberg atom. Chapter 3 is focussed on the recent achievements in calculations of form factors and dipole matrix elements of different types of bound-bound and bound-free radiative transitions. Chapter 4 concentrates on the formulation of basic theoretical methods and physical approaches to collisions involving R. atoms. Chapters 5 to 8 contain a systematic description of major directions and modern techniques in the collision theory of R. atoms and ions with atoms, molecules, electrons, and ions. Finally, Chapter 9 deals with the spectral-line broadening and shift of R. atomic series induced by collisions with neutral and charged particles. A subject index of four pages and 250 references are given. This monograph will be a basic tool and reference for all scientists working in the fields of plasma physics, spectroscopy, physics of electronic and atomic collisions, as well as astrophysics, radio astronomy, and space physics.

  12. An asymptotic expansion of the Kontorovich-Lebedev transform of damped oscillatory functions

    NASA Astrophysics Data System (ADS)

    Naylor, D.

    2002-08-01

    An asymptotic expansion valid for large positive values of s is constructed for the integral transformwhere Kis(x) denotes the modified Bessel function of the third kind of purely imaginary order. The expansion applies to functions f(x) that are analytic in the sector arg(x)[less-than-or-equals, slant][pi]/4 and that are exponentially damped and oscillatory as x-->[infinity] in this sector.

  13. Climate Verification Using Running Mann Whitney Z Statistics

    Technology Transfer Automated Retrieval System (TEKTRAN)

    A robust method previously used to detect observed intra- to multi-decadal (IMD) climate regimes was adapted to test whether climate models could reproduce IMD variations in U.S. surface temperatures during 1919-2008. This procedure, called the running Mann Whitney Z (MWZ) method, samples data ranki...

  14. A resolution expressing the sense of the Senate that the trial by the Russian Government of businessmen Mikhail Khodorkovsky and Platon Lebedev constitutes a politically-motivated case of selective arrest and prosecution that serves as a test of the rule of law and independence of the judicial system of Russia.

    THOMAS, 111th Congress

    Sen. Wicker, Roger F. [R-MS

    2009-06-18

    06/18/2009 Referred to the Committee on Foreign Relations. (text of measure as introduced: CR S6817-6818) (All Actions) Tracker: This bill has the status IntroducedHere are the steps for Status of Legislation:

  15. A resolution expressing the sense of the Senate that the conviction by the Government of Russia of businessman Mikhail Khodorkovsky and Platon Lebedev constitutes a politically motivated case of selective arrest and prosecution that flagrantly undermines the rule of law and independence of the judicial system of Russia.

    THOMAS, 112th Congress

    Sen. Wicker, Roger F. [R-MS

    2011-02-17

    02/17/2011 Referred to the Committee on Foreign Relations. (text of measure as introduced: CR S914-915) (All Actions) Tracker: This bill has the status IntroducedHere are the steps for Status of Legislation:

  16. Jubilee session of the FIAN and IOFAN Research Councils marking 300 years since the beginning of physical science research in Russia and 80 years of FIAN (28 April 2014)

    NASA Astrophysics Data System (ADS)

    2014-12-01

    A joint session of the Research Councils of the Lebedev Physical Institute of the Russian Academy of Sciences (FIAN) and the Prokhorov General Physics Institute of the Russian Academy of Sciences (IOFAN) marking 300 years since the beginning of physical science research in Russia and 80 years of FIAN was held on 28 April 2014 at the conference hall of the Lebedev Physical Institute, Russian Academy of Sciences (RAS).The agenda of the session, announced on the website http://www.lebedev.ru of the Lebedev Physical Institute listed the following reports: Jubilee session (1) Fortov V E, President of the Russian Academy of Sciences, "300 years of physical research in Russia"; (2) Mesyats G A, Director of the Lebedev Physical Institute, RAS, "LPI: past and present"; (3) Shcherbakov I A, Director of the Prokhorov General Physics Institute, RAS, "History of the development of lasers"; (4) Baturin Yu M, Director of the Vavilov Institute for the History of Science and Technology, "'Kunstkamera' and the development of physics in the 18th-20th centuries". Scientific session (5) Kardashev N S (Astro-Cosmic Center, Lebedev Physical Institute, RAS) "Modern cosmic radio astronomy: results and prospects"; (6) Kochiev D G, Shcherbakov I A (Prokhorov General Physics Institute, RAS) "Lasers in medicine"; (7) Kolachevsky N N (Lebedev Physical Institute, RAS) "Precision laser spectroscopy in fundamental studies"; (8) Kryukov P G (Lebedev Physical Institute, RAS) "Powerful femtosecond lasers"; (9) Pudalov V M (Lebedev Physical Institute, RAS) "New high-temperature superconductors: research and prospects"; (10) Demikhov E I (Lebedev Physical Institute, RAS) "Magnetic resonance imaging". Videos of the reports are posted on the website www.lebedev.ru/ru/sci-council.html?id=567 of the Lebedev Physical Institute. • Precision laser spectroscopy in fundamental studies, N N Kolachevsky, K Yu Khabarova Physics-Uspekhi, 2014, Volume 57, Number 12, Pages 1230-1238

  17. Reply to "Comment on `Thermodynamics of quantum crystalline membranes' "

    NASA Astrophysics Data System (ADS)

    Amorim, B.; Roldán, R.; Cappelluti, E.; Guinea, F.; Fasolino, A.; Katsnelson, M. I.

    2014-11-01

    We reply to the preceding Comment by Kats and Lebedev [Phys. Rev. B 90, 176301 (2014), 10.1103/PhysRevB.90.176301] about our paper [Phys. Rev. B 89, 224307 (2014), 10.1103/PhysRevB.89.224307]. Kats and Lebedev criticize the validity of our calculation with the use of a Debye momentum as an ultraviolet regulator of the theory and the obtention of a k2 term for the self-energy of out-of-plane modes. The arguments presented by Kats and Lebedev ignore basic facts about the theory of crystalline membranes. We address and counter argue the criticisms presented about our paper.

  18. A new diagnostic device: KINOX

    NASA Astrophysics Data System (ADS)

    Zaritsky, A. R.; Zaritskaya, G. A.; Pronin, V. S.; Raspopov, N. A.; Fock, M. V.

    2005-08-01

    A new diagnostic device KINOX created at P N Lebedev Physics Institute is described. With this device it is possible to trace the variations of oxygen permeability in erythrocyte membranes during the blood oxygenation. The molecular mechanism responsible for these variations was explained and experimentally tested at P N Lebedev Physics Institute. The diagnostic method is substantiated capable of estimating physiological reserves of organism basing on the results of blood oxygenation measurements performed with the KINOX. The possible reduction in physiological reserves of organism under the laser action on malignant tumor can be detected in this way.

  19. Reply to ``Comment on `Beamstrahlung considerations in laser-plasma-accelerator-based linear colliders' ''

    NASA Astrophysics Data System (ADS)

    Schroeder, C. B.; Esarey, E.; Leemans, W. P.

    2013-10-01

    We reply to Lebedev and Nagaitsev’s foregoing Comment [Phys. Rev. ST Accel. Beams 16, 108001 (2013)PRABFM1098-4402]. We disagree with the conclusion of the Comment that scattering imposes a fundamental limitation on plasma-based accelerator technology. Laser-plasma accelerators are compatible with high-luminosity collider concepts.

  20. Total absorption Cherenkov spectrometers

    NASA Astrophysics Data System (ADS)

    Malinovski, E. I.

    2015-05-01

    A short review of 50 years of work done with Cherenkov detectors in laboratories at the Lebedev Physical Institute is presented. The report considers some issues concerning the use of Cherenkov total absorption counters based on lead glass and heavy crystals in accelerator experiments.

  1. Hadronic Matter: The Moscow Perspective

    NASA Astrophysics Data System (ADS)

    Dremin, Igor

    I describe studies done by the theory group of Lebedev Physical Institute in Moscow and point out the cross-influence of some of our work with that of Rolf Hagedorn, and show how this research continued and evolved up to the present.

  2. On the 80th anniversary of V.S. Zuev

    NASA Astrophysics Data System (ADS)

    Krokhin, Oleg N.; Mikheev, L. D.; Nosach, O. Yu; Orlov, E. P.

    2013-07-01

    Professor Vitalii Sergeevich Zuev - doctor of Physics and Mathematics, academician of the Russian Academy of Natural Sciences, prominent scientist in the field of laser physics, principal researcher at the P.N. Lebedev Physics Institute and author of numerous scientific papers and two monographs - was 80 on 11 July 2013.

  3. Enhancing the Teaching and Learning Environment in the USSR. Annual Soviet-American Symposium on Teaching and Learning (2nd, Jacksonville, Florida, October 3-4, 1991). Special Publication Number 65.

    ERIC Educational Resources Information Center

    Community Colleges for International Development, Inc.

    This publication contains papers contributed by Russian educators at a symposium on preparing Soviet youth and adults for the challenges and opportunities of an emerging market economy. The following presentations are included: "Conception of Kazan Community College" (Mirza I. Makhmoutov, Oleg E. Liseitchikov, and Viktor I. Lebedev); "Complex…

  4. OBITUARY: In memory of Vitalii Sergeevich Zuev

    NASA Astrophysics Data System (ADS)

    Krokhin, O. N.; Mikheev, L. D.; Nosach, O. Yu; Orlov, E. P.; Semenov, A. S.

    2014-04-01

    Professor Vitalii Sergeevich Zuev - doctor of Physics and Mathematics, academician of the Russian Academy of Natural Sciences, prominent scientist in the field of laser physics, principal researcher at the P.N. Lebedev Physics Institute and author of numerous scientific papers and two monographs - died suddenly at the age of 80 on 28 March 2014.

  5. Fast Method of Detection of Periodical Radio Sources

    NASA Astrophysics Data System (ADS)

    Rodin, A. E.; Samodourov, V. A.; Oreshko, V. V.

    2015-11-01

    A fast method for searching periodical radio sources based on the Fast Fourier Transform at the radio telescope LPA LPI (the Large Phased Array of the Lebedev Physical Institute) is described. Examples of detection of already known pulsars and a list of new periodical radio sources with coordinates, period, and dispersion measure are presented.

  6. Modern problems in the physical sciences (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 16 November 2011)

    NASA Astrophysics Data System (ADS)

    2012-06-01

    On 16 November 2011, the scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) was held at the conference hall at the Lebedev Physical Institute, RAS.The agenda of the session announced on the RAS Physical Sciences Division website www.gpad.ac.ru included the following reports: (1) Schelev M Ya (Prokhorov General Physics Institute, RAS, Moscow) "Pico-femto-attosecond photoelectronics"; (2) Dal'karov O D (Lebedev Physical Institute, RAS, Moscow) "The physics of low-energy antiprotons and antimatter"; (3) Polukhina N G (Lebedev Physical Institute, RAS, Moscow) "Nuclear track detection: advances and potential in astrophysics, particle physics, and applied research"; (4) Vedeneev S I (Lebedev Physical Institute, RAS, Moscow) "High-temperature superconductors in high and ultrahigh magnetic fields".Papers written on the base of reports 1, 3, and 4 are presented below. • Pico-femto-attosecond photoelectronics: looking through the lens of half a century, M Ya Shchelev Physics-Uspekhi, 2012, Volume 55, Number 6, Pages 607-614 • Nuclear track detection: advances and potential in astrophysics, particle physics, and applied research, N G Polukhina Physics-Uspekhi, 2012, Volume 55, Number 6, Pages 614-625 • High-temperature superconductors in high and ultrahigh magnetic fields, S I Vedeneev Physics-Uspekhi, 2012, Volume 55, Number 6, Pages 625-632

  7. Astronomy and Gravity in former USSR

    NASA Astrophysics Data System (ADS)

    Gaina, Alex

    2005-09-01

    The proceeding contains recollections from the Meeting "Quantum Gravity", 1987, held in Moscow under the direction by M.A. Markov, V.A. Berezin and V.P. Frolov. A short meeting with A.D. Sakharov and a lunch with Stephen Hawking is recollected too. The seminars in P.N. Lebedev Physical Institute are storied.

  8. In memory of V L Ginzburg (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 27 October 2010)

    NASA Astrophysics Data System (ADS)

    2011-06-01

    The scientific session of the Physical Sciences Division (PSD) of the Russian Academy of Sciences (RAS), dedicated to the memory of V L Ginzburg, took place in the conference hall of the Lebedev Physical Institute, RAS on 27 October 2010.The agenda of the session announced on the website www.gpad.ac.ru of the RAS Physical Sciences Division listed the following reports: (1) Mesyats G A (Lebedev Physical Institute, RAS, Moscow) "Introductory word"; (2) Rubakov V A (Institute for Nuclear Research, RAS, Moscow) "Cosmology and the Large Hadron Collider"; (3) Gurevich A V (Lebedev Physical Institute, RAS, Moscow), Zelenyi L M (Space Research Institute, RAS, Moscow) "Intense gamma bursts in Earth's atmosphere (TGE) and the mission 'Chibis'"; (4) Vasiliev M A (Lebedev Physical Institute, RAS, Moscow) "Higher-spin theory"; (5) Maksimov E G (Lebedev Physical Institute, RAS, Moscow) "What is and what is not known about HTSC"; (6) Pudalov V M (Lebedev Physical Institute, RAS, Moscow, and Moscow Institute of Physics and Technology) "V L Ginzburg and the development of experimental work on high-temperature superconductivity at LPI: 'iron superconductors'". Papers based on talks 2, 4, and 6 are published below.For several reasons, L P Pitaevskii was unable to attend the session. He presented a paper dedicated to the memory of V L Ginzburg, which is published in this issue of Physics-Uspekhi (p. 625). • Cosmology and the Large Hadron Collider, V A Rubakov Physics-Uspekhi, 2011, Volume 54, Number 6, Pages 633-641 • V L Ginzburg and higher-spin fields, M A Vasiliev Physics-Uspekhi, 2011, Volume 54, Number 6, Pages 641-648 • V L Ginzburg and the development of experimental work on high-temperature superconductivity at LPI: 'iron superconductors', V M Pudalov, O E Omel'yanovskii, E P Khlybov, A V Sadakov, Yu F El'tsev, K V Mitsen, O M Ivanenko, K S Pervakov, D R Gizatulin, A S Usol'tsev, A S Dormidontov, S Yu Gavrilkin, A Yu Tsvetkov, Ya G Ponomarev, S A Kuzmichev, M G Mikheev

  9. Organic photonics and organic optoelectronics (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 30 January 2013)

    NASA Astrophysics Data System (ADS)

    2013-06-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS), "Organic photonics and organic optoelectronics," was held in the conference hall of the Lebedev Physical Institute, RAS, on 30 January 2013.The following reports were put on the session agenda as posted on the website http://www.gpad.ac.ru of the RAS Physical Sciences Division:1) Vitukhnovsky A G (Lebedev Physical Institute, RAS, Moscow) "Organic photonics: achievements and setbacks"; (2) Aleshin A N (Ioffe Physical Technical Institute, RAS, St. Petersburg) "Organic optoelectronics based on polymer-inorganic nanoparticle composite materials." Papers written on the basis of the reports are published below. • Organic photonics: achievements and setbacks, A G Vitukhnovsky Physics-Uspekhi, 2013, Volume 56, Number 6, Pages 623-627 • Organic optoelectronics based on polymer - inorganic nanoparticle composite materials, A N Aleshin Physics-Uspekhi, 2013, Volume 56, Number 6, Pages 627-632

  10. Spectral and spatial characteristics of x-ray film detectors in the wavelength range 20--150 {angstrom}

    SciTech Connect

    Fedin, D.A.; Fedorchuk, R.V.; Koshevoi, M.O.; Lukjantsev, I.V.; Rupasov, A.A.; Shikanov, A.S.; Gullikson, E.

    1995-12-31

    Investigations of spectral sensitivity, contrast coefficient, and spatial resolution of widely used x-ray films have been undertaken at the P.N. Lebedev Institute. A description of experimental methodologies and results are presented. These studies were carried out using synchrotron radiation in the range of 20--150 {angstrom}. Spectral sensitivity and contrast coefficient dependencies on wavelength for Kodak 10106, DEF, RAR2490, and TPF films and spatial resolution for Kodak 10106 and RAR2490 films are presented and discussed.

  11. Precision laser spectroscopy in fundamental studies

    NASA Astrophysics Data System (ADS)

    Kolachevsky, N. N.; Khabarova, K. Yu

    2014-12-01

    The role of precision spectroscopic measurements in the development of fundamental theories is discussed, with particular emphasis on the hydrogen atom, the simplest stable atomic system amenable to the accurate calculation of energy levels from quantum electrodynamics. Research areas that greatly benefited from the participation of the Lebedev Physical Institute are reviewed, including the violation of fundamental symmetries, the stability of the fine-structure constant α, and sensitive tests of quantum electrodynamics.

  12. Test Experiments on Muon Radiography with Emulsion Track Detectors in Russia

    NASA Astrophysics Data System (ADS)

    Aleksandrov, A. B.; Bagulya, A. V.; Chernyavsky, M. M.; Dedenko, L. G.; Fomenko, N. V.; Granich, G. M.; Galkin, V. I.; Konovalova, N. S.; Managadze, A. K.; Orurk, O. I.; Polukhina, N. G.; Roganova, T. M.; Shchedrina, T. V.; Starkov, N. I.; Tioukov, V. E.; Vladymyrov, M. S.; Zemskova, S. G.

    Lebedev Physical Institute (LPI RAS) and Skobeltsyn Institute of Nuclear Physics MSU (SINP MSU) have started the series of test muon radiography experiments in Russia. These experiments are aimed at determination of the optimal conditions of the setup, elaboration of algorithms for data processing and the study of the method peculiarities. The final goal of the method development is drafting of monitoring systems for natural and technological objects which condition may be a threat for the population, infrastructure or environment.

  13. The detection of coronal mass ejections in the interplanetary medium using scintillation observations

    NASA Astrophysics Data System (ADS)

    Glyantsev, A. V.; Tyul'bashev, S. A.; Chashei, I. V.; Shishov, V. I.

    2014-09-01

    Daily observations of scintillating radio sources obtained from July 2011 through June 2012 on the Big Scanning Antenna of the P.N. Lebedev Physical Institute at 111 MHz using a 16 beams system are analyzed. Variations in the observed scintillation indices are compared with data on solar X-ray flares and geomagnetic disturbances. Comparison of the observed scintillation indices on successive days enables the detection of most propagating disturbances associated with coronal events of class M5.0 and higher.

  14. View factors of cylindrical spiral surfaces

    NASA Astrophysics Data System (ADS)

    Lebedev, Vladimir A.; Solovjov, Vladimir P.

    2016-03-01

    Analytical expressions are presented for the view factors (radiative configuration factors) associated with the flat right cylindrical spiral surface. Such cylindrical spiral systems are widely applied as electrical resistance heating elements for lighting devices, electronic radio tubes, high-speed gas flow heaters, and other appliances used for scientific, industrial and domestic purposes. Derivation of the view factors is based on the invariant principles and the results presented in Lebedev (2000, 2003,1988) [1-3].

  15. SPECIAL ISSUE DEVOTED TO THE 80TH ANNIVERSARY OF ACADEMICIAN N G BASOV'S BIRTH: Photochemical lasers on electronic molecular transitions

    NASA Astrophysics Data System (ADS)

    Mikheev, L. D.

    2002-12-01

    The main stages of the development of the photochemical method for exciting near-IR, visible, and UV gas lasers are briefly reviewed on the basis of studies performed at the Department of Quantum Radiophysics at the P.N. Lebedev Physics Institute and jointly with other institutes within the framework of a program for creating high-power explosion-pumped lasers under the supervision of academician N.G. Basov.

  16. Towards efficient ab initio calculations of electron scattering by polyatomic molecules: I. Efficient numerical quadrature of the UGT term

    NASA Astrophysics Data System (ADS)

    Čársky, Petr

    2010-09-01

    The UGU term was used as a model of the UGT term, and its evaluation by numerical quadrature was examined systematically with a training set of eight molecules. Minimum numbers of points have been determined for radial Gauss-Legendre and angular Lebedev quadratures that preserve the accuracy needed for practical applications. These quadratures are recommended for efficient calculation of electron scattering by polyatomic molecules.

  17. CONFERENCES AND SYMPOSIA: Plasma phenomena in nanostructures and neutron stars Scientific Session of the Physical Sciences Division of the Russian Academy of Sciences (26 March 2008)

    NASA Astrophysics Data System (ADS)

    Klimov, V. V.; Istomin, Ya N.; Kosevich, Yu A.

    2008-08-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) was held on 26 March 2008 at the conference hall of the P N Lebedev Physical Institute, RAS. The following reports were presented at the session: (1) Klimov V V (P N Lebedev Physical Institute, RAS, Moscow) "Nanoplasmonics"; (2) Istomin Ya N (P N Lebedev Physical Institute, RAS, Moscow) "Electron-positron plasma generation in the magnetospheres of neutron stars"; (3) Kosevich Yu A (N N Semenov Institute of Chemical Physics, RAS, Moscow) "Multichannel propagation and scattering of phonons and photons in low-dimension nanostructures". An abridged version of these reports is given below. • Nanoplasmonics, V V Klimov Physics-Uspekhi, 2008, Volume 51, Number 8, Pages 839-844 • Electron-positron plasma generation in the magnetospheres of neutron stars, Ya N Istomin Physics-Uspekhi, 2008, Volume 51, Number 8, Pages 844-848 • Multichannel propagation and scattering of phonons and photons in low-dimension nanostructures, Yu A Kosevich Physics-Uspekhi, 2008, Volume 51, Number 8, Pages 848-859

  18. Commemoration of the 90th anniversary of the birth of Andrei Dmitrievich Sakharov (Scientific session of the Physical Sciences Division, Russian Academy of Sciences, 25 May 2011)

    NASA Astrophysics Data System (ADS)

    2012-02-01

    On 25 May 2011, the scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS), devoted to the 90th anniversary of Andrei Dmitrievich Sakharov's birthday, was held at the conference hall of the Lebedev Physical Institute, RAS.The agenda of the session announced on the website www.gpad.ac.ru of the PSD RAS contains the following reports: (1) Mesyats G A (Lebedev Physical Institute, RAS, Moscow) "Introduction. Greetings"; (2) Ritus V I (Lebedev Physical Institute, RAS, Moscow) "A D Sakharov: personality and fate"; (3) Altshuler B L (Lebedev Physical Institute, RAS, Moscow) "Scientific and public legacy of A D Sakharov today"; (4) Ilkaev R I (Russian Federal Nuclear Center 'All-Russian Research Institute of Experimental Physics', Sarov, Nizhny Novgorod region) "The path of a genius: Sakharov at KB-11"; (5) Novikov I D (Astrocosmic Center, Lebedev Physical Institute, RAS, Moscow) "Wormholes and the multielement Universe"; (6) Azizov E A (National Research Centre 'Kurchatov Institute', Moscow) "Tokamaks: 60 years later"; (7) Kardashev N S (Astrocosmic Center, Lebedev Physical Institute, RAS, Moscow) "Cosmic interferometers"; (8) Lukash V I (Lebedev Physical Institute, RAS, Moscow) "From the cosmological model to the Hubble flux formation"; (9) Grishchuk L P (Shternberg State Astronomical Institute, Lomonosov Moscow State University, Moscow; School of Physics and Astronomy, Cardiff University, Cardiff, United Kingdom) "Cosmological Sakharov oscillations and quantum mechanics of the early Universe". Articles based on reports 2-4, 6, 8, and 9 are published below. The content of report 5 is close to papers "Multicomponent Universe and astrophysics of wormholes" by I D Novikov, N S Kardashev, A A Shatskii [Phys. Usp. 50 965 (2007)] and "Dynamic model of a wormhole and the Multiuniverse model" by A A Shatskii, I D Novikov, N S Kardashev [Phys. Usp. 51 457 (2008)]. The content of report 7 is close to the paper "Radioastron - a radio telescope

  19. Electrostatic point charge fitting as an inverse problem: Revealing the underlying ill-conditioning

    NASA Astrophysics Data System (ADS)

    Ivanov, Maxim V.; Talipov, Marat R.; Timerghazin, Qadir K.

    2015-10-01

    Atom-centered point charge (PC) model of the molecular electrostatics—a major workhorse of the atomistic biomolecular simulations—is usually parameterized by least-squares (LS) fitting of the point charge values to a reference electrostatic potential, a procedure that suffers from numerical instabilities due to the ill-conditioned nature of the LS problem. To reveal the origins of this ill-conditioning, we start with a general treatment of the point charge fitting problem as an inverse problem and construct an analytical model with the point charges spherically arranged according to Lebedev quadrature which is naturally suited for the inverse electrostatic problem. This analytical model is contrasted to the atom-centered point-charge model that can be viewed as an irregular quadrature poorly suited for the problem. This analysis shows that the numerical problems of the point charge fitting are due to the decay of the curvatures corresponding to the eigenvectors of LS sum Hessian matrix. In part, this ill-conditioning is intrinsic to the problem and is related to decreasing electrostatic contribution of the higher multipole moments, that are, in the case of Lebedev grid model, directly associated with the Hessian eigenvectors. For the atom-centered model, this association breaks down beyond the first few eigenvectors related to the high-curvature monopole and dipole terms; this leads to even wider spread-out of the Hessian curvature values. Using these insights, it is possible to alleviate the ill-conditioning of the LS point-charge fitting without introducing external restraints and/or constraints. Also, as the analytical Lebedev grid PC model proposed here can reproduce multipole moments up to a given rank, it may provide a promising alternative to including explicit multipole terms in a force field.

  20. The 100th anniversary of the birth of N E Alekseevskii (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 23 May 2012)

    NASA Astrophysics Data System (ADS)

    2013-02-01

    The scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) commemorating the 100th anniversary of the birth of RAS Corresponding Member N E Alekseevskii took place on 23 May 2012 at the conference hall of the Lebedev Physical Institute, RAS. The following reports were put on the session agenda as posted on the website http://www.gpad.ac.ru of the RAS Physical Sciences Division: (1) Kopaev Yu V (Lebedev Physical Institute, RAS, Moscow) "About N E Alekseevskii" (2) Brandt N B (Lomonosov Moscow State University, Moscow) "My teacher Nikolai Evgen'evich Alekseevskii"; (3) Peschansky V G (B I Verkin Physical-Technical Institute of Low Temperatures of the National Academy of Sciences of Ukraine, Kharkov, Ukraine) "Galvanomagnetic effects in layered conductors"; (4) Krasnoperov E P (The National Research Center 'Kurchatov Institute', Moscow) "First steps of technical superconductivity in the USSR"; (5) Nizhankovsky V I (International Laboratory of High Magnetic Fields and Low Temperatures, Wroclaw, Poland), Tsebro V I (Lebedev Physical Institute, RAS, Moscow) "History of creation and growth of the International Laboratory of High Magnetic Fields and Low Temperatures".Papers written on the basis of oral presentations 2 - 5 are printed below. • The best years of my life, N B Brandt Physics-Uspekhi, 2013, Volume 56, Number 2, Pages 192-198 • Galvanomagnetic phenomena in layered conductors, V G Peschansky Physics-Uspekhi, 2013, Volume 56, Number 2, Pages 198-201 • At the origins of applied superconductivity, E P Krasnoperov Physics-Uspekhi, 2013, Volume 56, Number 2, Pages 202-204 • International Laboratory of High Magnetic Fields and Low Temperatures: how it was set up and how it evolved, V I Nizhankovskii, V I Tsebro Physics-Uspekhi, 2013, Volume 56, Number 2, Pages 204-210

  1. Modern problems in the physical sciences (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 30 November 2011)

    NASA Astrophysics Data System (ADS)

    2012-08-01

    On 30 November 2011, a scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) was held in the conference hall of the Lebedev Physical Institute, RAS.The agenda of the session announced on the RAS Physical Sciences Division website www.gpad.ac.ru included the following reports: (1) Ivchenko E L (Ioffe Physical Technical Institute, RAS, St. Petersburg) "Spin physics in semiconductor nanosystems"; (2) Golub L E (A F Ioffe Physical Technical Institute, RAS, St. Petersburg) "Spin transport in heterostructures"; (3) Levchenko A A (Institute of Solid State Physics, RAS, Chernogolovka, Moscow region) "Capillary turbulence on the surface of quantum liquids"; (4) Babin S A (Institute of Automation and Electrometry, Siberian Branch of the RAS) "New generation modes in fiber lasers"; (5) Kurt V G (Astro-Space Center of the Lebedev Physical Institute, RAS, Moscow) "Motion of the Sun through the interstellar medium"; (6) Lukash V N (Astro-Space Center of the Lebedev Physical Institute, RAS, Moscow) "Cosmological flow generation in general relativity".Papers written on the basis of oral reports 1-3, 5, and 6 are presented below. • Spin physics in semiconductor nanosystems, E L Ivchenko Physics-Uspekhi, 2012, Volume 55, Number 8, Pages 808-814 • Spin transport in heterostructures, L E Golub Physics-Uspekhi, 2012, Volume 55, Number 8, Pages 814-818 • Kinetic and discrete turbulence on the surface of quantum liquids, L V Abdurakhimov, M Yu Brazhnikov, A A Levchenko, I A Remizov, S V Filatov Physics-Uspekhi, 2012, Volume 55, Number 8, Pages 818-825 • Motion of the Sun through the interstellar medium, V G Kurt, E N Mironova Physics-Uspekhi, 2012, Volume 55, Number 8, Pages 825-831 • Generation of cosmological flows in general relativity, V N Lukash, E V Mikheeva, V N Strokov Physics-Uspekhi, 2012, Volume 55, Number 8, Pages 831-837

  2. Electrostatic point charge fitting as an inverse problem: Revealing the underlying ill-conditioning

    SciTech Connect

    Ivanov, Maxim V.; Talipov, Marat R.; Timerghazin, Qadir K.

    2015-10-07

    Atom-centered point charge (PC) model of the molecular electrostatics—a major workhorse of the atomistic biomolecular simulations—is usually parameterized by least-squares (LS) fitting of the point charge values to a reference electrostatic potential, a procedure that suffers from numerical instabilities due to the ill-conditioned nature of the LS problem. To reveal the origins of this ill-conditioning, we start with a general treatment of the point charge fitting problem as an inverse problem and construct an analytical model with the point charges spherically arranged according to Lebedev quadrature which is naturally suited for the inverse electrostatic problem. This analytical model is contrasted to the atom-centered point-charge model that can be viewed as an irregular quadrature poorly suited for the problem. This analysis shows that the numerical problems of the point charge fitting are due to the decay of the curvatures corresponding to the eigenvectors of LS sum Hessian matrix. In part, this ill-conditioning is intrinsic to the problem and is related to decreasing electrostatic contribution of the higher multipole moments, that are, in the case of Lebedev grid model, directly associated with the Hessian eigenvectors. For the atom-centered model, this association breaks down beyond the first few eigenvectors related to the high-curvature monopole and dipole terms; this leads to even wider spread-out of the Hessian curvature values. Using these insights, it is possible to alleviate the ill-conditioning of the LS point-charge fitting without introducing external restraints and/or constraints. Also, as the analytical Lebedev grid PC model proposed here can reproduce multipole moments up to a given rank, it may provide a promising alternative to including explicit multipole terms in a force field.

  3. Electrostatic point charge fitting as an inverse problem: Revealing the underlying ill-conditioning.

    PubMed

    Ivanov, Maxim V; Talipov, Marat R; Timerghazin, Qadir K

    2015-10-01

    Atom-centered point charge (PC) model of the molecular electrostatics-a major workhorse of the atomistic biomolecular simulations-is usually parameterized by least-squares (LS) fitting of the point charge values to a reference electrostatic potential, a procedure that suffers from numerical instabilities due to the ill-conditioned nature of the LS problem. To reveal the origins of this ill-conditioning, we start with a general treatment of the point charge fitting problem as an inverse problem and construct an analytical model with the point charges spherically arranged according to Lebedev quadrature which is naturally suited for the inverse electrostatic problem. This analytical model is contrasted to the atom-centered point-charge model that can be viewed as an irregular quadrature poorly suited for the problem. This analysis shows that the numerical problems of the point charge fitting are due to the decay of the curvatures corresponding to the eigenvectors of LS sum Hessian matrix. In part, this ill-conditioning is intrinsic to the problem and is related to decreasing electrostatic contribution of the higher multipole moments, that are, in the case of Lebedev grid model, directly associated with the Hessian eigenvectors. For the atom-centered model, this association breaks down beyond the first few eigenvectors related to the high-curvature monopole and dipole terms; this leads to even wider spread-out of the Hessian curvature values. Using these insights, it is possible to alleviate the ill-conditioning of the LS point-charge fitting without introducing external restraints and/or constraints. Also, as the analytical Lebedev grid PC model proposed here can reproduce multipole moments up to a given rank, it may provide a promising alternative to including explicit multipole terms in a force field. PMID:26450287

  4. Plasmonics (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 21 February 2012)

    NASA Astrophysics Data System (ADS)

    2012-10-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS), entitled 'Plasmonics', was held in the Conference Hall of the Lebedev Physical Institute, RAS on 21 February 2012. The following reports were put on the session agenda posted on the website www.gpad.ac.ru of the RAS Physical Sciences Division: (1) Kukushkin I V, Murav'ev V M (Institute of Solid State Physics, RAS, Chernogolovka, Moscow region) "Terahertz plasmonics"; (2) Lozovik Yu E (Institute of Spectroscopy, RAS, Troitsk, Moscow region) "Plasmonics and magnetoplasmonics based on graphene and a topological insulator"; (3) Protsenko I E (P N Lebedev Physical Institute, RAS, Moscow) "Dipole nanolaser"; (4) Vinogradov A P, Andrianov E S, Pukhov A A, Dorofeenko A V (Institute for Theoretical and Applied Electrodynamics, RAS, Moscow), Lisyansky A A (Queens College of the City University of New York, USA) "Quantum plasmonics of metamaterials: loss compensation using spasers"; (5) Klimov V V (Lebedev Physical Institute, RAS, Moscow) "Quantum theory of radiation of optically active molecules in the vicinity of chiral nano-meta-particles". The papers written on the basis of oral reports 2-5 are published below. • Plasmonics and magnetoplasmonics based on graphene and a topological insulator, Yu E Lozovik Physics-Uspekhi, 2012, Volume 55, Number 10, Pages 1035-1039 • Theory of the dipole nanolaser, I E Protsenko Physics-Uspekhi, 2012, Volume 55, Number 10, Pages 1040-1046 • Quantum plasmonics of metamaterials: loss compensation using spasers, A P Vinogradov, E S Andrianov, A A Pukhov, A V Dorofeenko, A A Lisyansky Physics-Uspekhi, 2012, Volume 55, Number 10, Pages 1046-1053 • Using chiral nano-meta-particles to control chiral molecule radiation, V V Klimov, D V Guzatov Physics-Uspekhi, 2012, Volume 55, Number 10, Pages 1054-1058

  5. Laboratory Studies of Supersonic Magnetized Plasma Jets and Radiative Shocks

    NASA Astrophysics Data System (ADS)

    Lebedev, Sergey

    2013-06-01

    In this talk I will focus on laboratory plasma experiments producing magnetically driven supersonic plasma jets and on the interaction of these jets with ambient media. The experiments are scalable to astrophysical flows in that the critical dimensionless numbers such as the plasma collisionality, the plasma beta, the Reynolds number and the magnetic Reynolds number are all in the astrophysically appropriate ranges. The experimental results will be compared with computer simulations performed with laboratory plasma codes and with astrophysical codes. In the experiments the jets are driven and collimated by the toroidal magnetic fields and it is found that the level of MHD instabilities in the jets strongly depends on the strength of the field represented by the ratio of the thermal to magnetic field pressures (plasma beta). The experiments show the possibility of formation of episodic outflows, with periodic ejections of magnetic bubbles naturally evolving into a heterogeneous jet propagating inside a channel made of self-collimated magnetic cavities [1,2]. We also found that it is possible to form quasi-laminar jets which are “indirectly” collimated by the toroidal magnetic fields, but this requires the presence of the lower density halo plasma surrounding the central jet [3]. Studies of the radiative shocks formed in the interaction of the supersonic magnetized plasma flows with ambient plasma will be also presented, and the development of cooling instabilities in the post-shock plasma will be discussed. This research was sponsored by EPSRC Grant No. EP/G001324/1 and by the OFES DOE under DOE Cooperative Agreement No. DE-SC-0001063. References 1. A. Ciardi, S.V. Lebedev, A. Frank et al., The Astrophysical Journal, 691: L147-L150 (2009) 2. F.A. Suzuki-Vidal, S.V. Lebedev, S.N. Bland et al., Physics of Plasmas, 17, 112708 (2010). 3. F.A. Suzuki-Vidal, M. Bocchi, S.V. Lebedev et al., Physics of Plasmas, 19, 022708 (2012).

  6. Detection of new pulsars at 111 MHz

    NASA Astrophysics Data System (ADS)

    Tyul'bashev, S. A.; Tyul'bashev, V. S.; Oreshko, V. V.; Logvinenko, S. V.

    2016-02-01

    The first results of a search for pulsars using the Large Phased Array of the Lebedev Physical Institute at 111 MHz for right ascensions 0h-24h and declinations 21°-42° are reported. Data with a time resolution of 100 ms in six frequency channels within a 2.5-MHz frequency band have been processed. Thirty-four pulsars have been detected, of which seventeen were observed on this telescope earlier; ten known pulsars had not been observed earlier. Seven new pulsars have been discovered.

  7. Controlling plasma channels through ultrashort laser pulse filamentation

    NASA Astrophysics Data System (ADS)

    Ionin, Andrey A.; Seleznev, Leonid V.; Sunchugasheva, Elena S.

    2013-10-01

    A review of studies fulfilled at the Lebedev Institute in collaboration with the Moscow State University and Institute of Atmospheric Optics in Tomsk (Siberia) on influence of various characteristics of ultrashort laser pulse on plasma channels formed under its filamentation is presented. Filamentation of high-power laser pulses with wavefront controlled by a deformable mirror, with cross-sections spatially formed by various diaphragms and with different wavelengths was experimentally and numerically studied. An application of plasma channels formed due to filamentation of ultrashort laser pulse including a train of such pulses for triggering and guiding electric discharge is discussed.

  8. Parameters of the turbulence of the interplanetary plasma derived from scintillation observations of the quasars 3C 48 and 3C 298 at the solar-activity maximum

    NASA Astrophysics Data System (ADS)

    Glubokova, S. K.; Glyantsev, A. V.; Tyul'bashev, S. A.; Chashei, I. V.; Shishov, V. I.

    2015-01-01

    An analysis of temporal spectra of interplanetary scintillations of the radio sources 3C 48 and 3C 298 observed at 111 MHz on the Big Scanning Antenna of the Lebedev Physical Institute at the maximum of the 24th solar-activity cycle is reported. The measured temporal spectra of the scintillations are used to estimate the velocity of the in homogeneities and the index of the spatial spectrum of the turbulence. The dependence of the spectral index of the turbulence on the solar-wind speed persists in periods of high solar activity, when the global spatial structure of the solar wind is strongly modulated by the activity cycle.

  9. Ground level neutron monitoring instruments

    NASA Astrophysics Data System (ADS)

    Philippov, Maxim; Makhmutov, Vladimir; Stozhkov, Yuri; Maksumov, Osman; Viktorov, Sergey; Kvashnin, Alexander; Kvashnin, Aleksandr

    In the scope of scientific collaboration between Lebedev Physical Institute RAS, University Mackenzie (Brazil) and National Space Institute (INPE, Brazil) we are currenty involved in the developing of neutron detector. This experimental device will help us to study high energy phenomena at the Sun and dynamic processes in the Earth's atmosphere. The device consists of several detecting modules. Each of them includes neutron detectors, pressure and temperature sensors. To receive data from each detecting module uses interface module that connects to computer via serial interface. We present and discuss first experimental results obtained by constructed neutron detector.

  10. Thermal decomposition of polystyrene in the high temperature fabrication technology of hollow microspheres. Revision 1

    SciTech Connect

    Dorogotovtsev, V.M.; Akunets, A.A.; Merkuliev, Y.A.; Turivnoy, A.P.; Reibold, R.; Fearon, E.; Cook, R.

    1997-03-26

    The degree and nature of polymer degradation that occurs in the high temperature microshell formation process developed at the Lebedev Physical Institute has been examined experimentally. We find that significant mass degradation occurs during the final stages of shell formation. This manifests itself both in terms of mass loss and molecular weight degradation as measured by gel permeation chromatography. This decrease in the molecular weight may be in part responsible for the relatively fragile nature of the shells produced by this high temperature process. 9 refs., 6 figs., 2 tabs.

  11. 120th anniversary of the birth of Sergei Ivanovich Vavilov (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 30 March 2011)

    NASA Astrophysics Data System (ADS)

    2011-12-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) dedicated to the 120th anniversary of the birth of Sergei Ivanovich Vavilov was held in the Conference Hall of the P N Lebedev Physical Institute, RAS, on 30 March 2011. The following reports were put on the session's agenda posted on the web site www.gpad.ac.ru of the Physical Sciences Division, RAS: (1) Masalov A V (P N Lebedev Physical Institute, RAS, Moscow) "S I Vavilov and nonlinear optics"; (2) Basiev T T (Laser Materials and Technology Research Center, A M Prokhorov General Physics Institute, RAS, Moscow) "Luminescent nanophotonics and high-power lasers"; (3) Vitukhnovsky A G (P N Lebedev Physical Institute, RAS, Moscow) "Advances in luminescent light sources and displays"; (4) Aleksandrov E B (Ioffe Physical Technical Institute, RAS, St. Petersburg) "Sergei Ivanovich Vavilov and the special theory of relativity"; (5) Bolotovsky B M (P N Lebedev Physical Institute, RAS, Moscow) "Vavilov-Cherenkov effect"; (6) Vizgin V P (S I Vavilov Institute of the History of Natural Scienses and Technology, RAS, Moscow) "Sergei Ivanovich Vavilov as a historian of science"; (7) Ginzburg A S (Knowledge Society) "Academician S I Vavilov — a devotee of the enlightenment and the first president of the Knowledge Society of the USSR". The papers written on the basis of reports 1-4 and 6 are given below. The main contents of report 5 is reflected in the paper "Vavilov-Cherenkov radiation: its discovery and application" [Usp. Fiz. Nauk 179 1161 (2009); Phys. Usp. 52 1099 (2009)] published earlier by B M Bolotovsky. • S I Vavilov and nonlinear optics, A V Masalov, Z A Chizhikova Physics-Uspekhi, 2011, Volume 54, Number 12, Pages 1257-1262 • Luminescent nanophotonics, fluoride laser ceramics, and crystals, T T Basiev, I T Basieva, M E Doroshenko Physics-Uspekhi, 2011, Volume 54, Number 12, Pages 1262-1268 • Advances in light sources and displays, A G Vitukhnovsky Physics

  12. C*-algebras associated with reversible extensions of logistic maps

    NASA Astrophysics Data System (ADS)

    Kwaśniewski, Bartosz K.

    2012-10-01

    The construction of reversible extensions of dynamical systems presented in a previous paper by the author and A.V. Lebedev is enhanced, so that it applies to arbitrary mappings (not necessarily with open range). It is based on calculating the maximal ideal space of C*-algebras that extends endomorphisms to partial automorphisms via partial isometric representations, and involves a new set of 'parameters' (the role of parameters is played by chosen sets or ideals). As model examples, we give a thorough description of reversible extensions of logistic maps and a classification of systems associated with compression of unitaries generating homeomorphisms of the circle. Bibliography: 34 titles.

  13. C*-algebras associated with reversible extensions of logistic maps

    SciTech Connect

    Kwasniewski, Bartosz K

    2012-10-31

    The construction of reversible extensions of dynamical systems presented in a previous paper by the author and A.V. Lebedev is enhanced, so that it applies to arbitrary mappings (not necessarily with open range). It is based on calculating the maximal ideal space of C*-algebras that extends endomorphisms to partial automorphisms via partial isometric representations, and involves a new set of 'parameters' (the role of parameters is played by chosen sets or ideals). As model examples, we give a thorough description of reversible extensions of logistic maps and a classification of systems associated with compression of unitaries generating homeomorphisms of the circle. Bibliography: 34 titles.

  14. Scientific research in the Soviet Union

    SciTech Connect

    Mtingwa, S.K.

    1990-03-19

    I report on the scientific aspects of my US/USSR Interacademy Exchange Visit to the Soviet Union. My research was conducted at three different institutes: the Lebedev Physical Institute in Moscow, the Leningrad Nuclear Physics Institute in Gatchina, and the Yerevan Physics Institute in Soviet Armenia. I included relevant information about the Soviet educational system, salaries of Soviet physicists, work habits and research activities at the three institutes, and the relevance of that research to work going on in the United States. 18 refs.

  15. TESIS experiment on XUV imaging spectroscopy of the Sun onboard the CORONAS-PHOTON satellite

    NASA Astrophysics Data System (ADS)

    Kuzin, S. V.; Zhitnik, I. A.; Bogachev, S. A.; Shestov, S. V.; Bugaenko, O. I.; Suhodrev, N. K.; Pertsov, A. A.; Mitrofanov, A. V.; Ignat'ev, A. P.; Slemzin, V. A.

    We present a brief description of new complex of space telescopes and spectrographs, TESIS, which will be placed aboard the CORONAS-PHOTON satellite. The complex is intended for high-resolution imaging observation of full Sun in the coronal spectral lines and in the spectral lines of the solar transition region. TESIS will be launched at the end of 2007 - early of 2008. About 25 % of the daily TESIS images will be free for use and for downloading from the TESIS data center that is planned to open 2 months before the TESIS launching at http://www.tesis.lebedev.ru

  16. 100th anniversary of the discovery of cosmic rays (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 24 October 2012)

    NASA Astrophysics Data System (ADS)

    2013-03-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS), entitled "100th anniversary of the discovery of cosmic rays," was held on 24 October 2012 in the conference hall of the Lebedev Physical Institute, RAS.The agenda of the session announced on the RAS Physical Sciences Division website www.gpad.ac.ru included the following reports: (1) Panasyuk M I (Skobeltsyn Institute of Nuclear Physics of the Lomonosov State University, Moscow) "The contribution of Russian scientists to the centennial history of the development of the physics of cosmic rays"; (2) Ryazhskaya O G (Institute for Nuclear Research, Russian Academy of Sciences, Moscow) "On experiments in underground physics"; (3) Krymskii G F, Berezhko E G (Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch of the Russian Academy of Sciences, Yakutsk) "The origin of cosmic rays"; (4) Stozhkov Yu I (Lebedev Physical Institute, Russian Academy of Sciences, Moscow) "Cosmic rays in the heliosphere"; (5) Troitsky S V (Institute for Nuclear Research, Russian Academy of Sciences, Moscow) "Cosmic particles of energies >1019 eV: a short review of results."Papers based on reports 2 and 5 are presented below. • On experiments in Underground Physics, O G Ryazhskaya Physics-Uspekhi, 2013, Volume 56, Number 3, Pages 296-304 • Cosmic particles with energies above 1019 eV: a brief summary of results, S V Troitsky Physics-Uspekhi, 2013, Volume 56, Number 3, Pages 304-310

  17. Fourth International Conference on Squeezed States and Uncertainty Relations

    NASA Technical Reports Server (NTRS)

    Han, D. (Editor); Peng, Kunchi (Editor); Kim, Y. S. (Editor); Manko, V. I. (Editor)

    1996-01-01

    The fourth International Conference on Squeezed States and Uncertainty Relations was held at Shanxi University, Taiyuan, Shanxi, China, on June 5 - 9, 1995. This conference was jointly organized by Shanxi University, the University of Maryland (U.S.A.), and the Lebedev Physical Institute (Russia). The first meeting of this series was called the Workshop on Squeezed States and Uncertainty Relations, and was held in 1991 at College Park, Maryland. The second and third meetings in this series were hosted in 1992 by the Lebedev Institute in Moscow, and in 1993 by the University of Maryland Baltimore County, respectively. The scientific purpose of this series was initially to discuss squeezed states of light, but in recent years, the scope is becoming broad enough to include studies of uncertainty relations and squeeze transformations in all branches of physics, including, of course, quantum optics and foundations of quantum mechanics. Quantum optics will continue playing the pivotal role in the future, but the future meetings will include all branches of physics where squeeze transformations are basic transformation. This transition took place at the fourth meeting of this series held at Shanxi University in 1995. The fifth meeting in this series will be held in Budapest (Hungary) in 1997, and the principal organizer will be Jozsef Janszky of the Laboratory of Crystal Physics, P.O. Box 132, H-1052. Budapest, Hungary.

  18. Modern problems in the physical sciences (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 23 November 2011)

    NASA Astrophysics Data System (ADS)

    2012-07-01

    On 23 November 2011, the scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) was held at the conference hall of the Lebedev Physical Institute, RAS.The following reports were put on the session agenda posted on the website www.gpad.ac.ru of the RAS Physical Sciences Division: (1) Ionin A A (Lebedev Physical Institute, RAS, Moscow) "High-power infrared and ultraviolet lasers and their applications"; (2) Romanovskii M Yu (Prokhorov General Physics Institute, RAS, Moscow) "Laser-induced acceleration of the forbidden captures of orbital electrons by nuclei"; (3) Petrukovich A A (Space Research Institute, RAS, Moscow) "Earth's magnetosphere as a plasma laboratory"; (4) Shchur L N (Landau Institute for Theoretical Physics, RAS, Chernogolovka, Moscow region) "Computational physics and the verification of theoretical predictions". Articles written on the base of oral reports 1, 2, and 4 are published below. • High-power IR- and UV-laser systems and their applications, A A Ionin Physics-Uspekhi, 2012, Volume 55, Number 7, Pages 721-728 • Laser radiation enhancement of forbidden orbital electron captures and of neutrinoless double electron captures by nuclei, M Yu Romanovskii Physics-Uspekhi, 2012, Volume 55, Number 7, Pages 728-733 • Computational physics and testing theoretical predictions, L N Shchur Physics-Uspekhi, 2012, Volume 55, Number 7, Pages 733-738

  19. Physiology of Pseudomonas aeruginosa in biofilms as revealed by transcriptome analysis

    PubMed Central

    2010-01-01

    Background Transcriptome analysis was applied to characterize the physiological activities of Pseudomonas aeruginosa grown for three days in drip-flow biofilm reactors. Conventional applications of transcriptional profiling often compare two paired data sets that differ in a single experimentally controlled variable. In contrast this study obtained the transcriptome of a single biofilm state, ranked transcript signals to make the priorities of the population manifest, and compared ranki ngs for a priori identified physiological marker genes between the biofilm and published data sets. Results Biofilms tolerated exposure to antibiotics, harbored steep oxygen concentration gradients, and exhibited stratified and heterogeneous spatial patterns of protein synthetic activity. Transcriptional profiling was performed and the signal intensity of each transcript was ranked to gain insight into the physiological state of the biofilm population. Similar rankings were obtained from data sets published in the GEO database http://www.ncbi.nlm.nih.gov/geo. By comparing the rank of genes selected as markers for particular physiological activities between the biofilm and comparator data sets, it was possible to infer qualitative features of the physiological state of the biofilm bacteria. These biofilms appeared, from their transcriptome, to be glucose nourished, iron replete, oxygen limited, and growing slowly or exhibiting stationary phase character. Genes associated with elaboration of type IV pili were strongly expressed in the biofilm. The biofilm population did not indicate oxidative stress, homoserine lactone mediated quorum sensing, or activation of efflux pumps. Using correlations with transcript ranks, the average specific growth rate of biofilm cells was estimated to be 0.08 h-1. Conclusions Collectively these data underscore the oxygen-limited, slow-growing nature of the biofilm population and are consistent with antimicrobial tolerance due to low metabolic activity

  20. Superconductivity in iron-based compounds (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 29 January 2014)

    NASA Astrophysics Data System (ADS)

    2014-08-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS), entitled 'Superconductivity in iron-based compounds', was held on 29 January 2014 at the conference hall of the Lebedev Physical Institute, RAS. The agenda of the session, announced on the website http://www.gpad.ac.ru of the RAS Physical Sciences Division listed the following reports: (1) Eremin I M (Institut für Theoretische Physik III, Ruhr-Universität Bochum, Bochum, Deutschland; Kazan (Volga region) Federal University, Kazan, Russian Federation) "Antiferromagnetism in iron-based superconductors: interaction of the magnetic, orbital, and lattice degrees of freedom"; (2) Korshunov M M (Kirenskii Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk) "Superconducting state in iron-based materials and spin-fluctuation pairing theory"; (3) Kuzmicheva T E (Lebedev Physical Institute, Russian Academy of Sciences, Moscow; Lomonosov Moscow State University) "Andreev spectroscopy of iron-based superconductors: temperature dependence of the order parameters and scaling of Δ_L, S with T_C"; (4) Eltsev Yu F (Lebedev Physical Institute, Russian Academy of Sciences, Moscow) "Synthesis and study of the magnetic and transport properties of iron-based superconductors of the 122 family". Papers written on the basis of oral presentations 1-4 are published below. • Antiferromagnetism in iron-based superconductors: magnetic order in the model of delocalized electrons, I M Eremin Physics-Uspekhi, 2014, Volume 57, Number 8, Pages 807-813 • Superconducting state in iron-based materials and spin-fluctuation pairing theory, M M Korshunov Physics-Uspekhi, 2014, Volume 57, Number 8, Pages 813-819 • Andreev spectroscopy of iron-based superconductors: temperature dependence of the order parameters and scaling of Δ_L, S with T_C, T E Kuzmicheva, S A Kuzmichev, M G Mikheev, Ya G Ponomarev, S N Tchesnokov, V M Pudalov, E P Khlybov, N D Zhigadlo Physics

  1. Surface-wave tomography of Ireland and surroundings using ambient noise and teleseismic data

    NASA Astrophysics Data System (ADS)

    Bonadio, Raffaele; Arroucau, Pierre; Lebedev, Sergei; Meier, Thomas; Schaeffer, Andrew; Licciardi, Andrea; Piana Agostinetti, Nicola

    2016-04-01

    Ireland's geology is dominated by northeast-southwest structural trends and suture zones, mostly inferred from geological mapping and a few active source seismic experiments. However, their geometry and extent at depth and their continuity across the Irish Sea are still poorly known. Important questions also remain unanswered regarding the thickness and bulk properties of the sedimentary cover at the regional scale, the deformation and flow of the deep crust during the formation of Ireland, the thickness of Ireland's lithosphere today, and the thermal structure and dynamics of the asthenosphere beneath Ireland. In this work, we take advantage of abundant, newly available broadband data from temporary array deployments and permanent seismic networks in Ireland and Great Britain to produce high-resolution models of seismic velocity structure and anisotropy of the lithosphere. We combine Rayleigh and Love phase velocity measurements from waveform cross-correlation using both ambient noise and teleseismic data in order to produce high-quality dispersion curves for periods ranging from 1 to 300 s. The phase velocity measurement procedures are adapted from Meier et al.[2], Lebedev et al.[1] and Soomro et al.[3] and are automated in order to deal with the large amount of data and ensure consistency and reproducibility. For the nearly 200 stations used in this study, we obtain a very large number of dispersion curves from both ambient noise and teleseimic data. Dispersion measurements are then inverted in a tomographic procedure for surface-wave phase velocity maps in a very broad period range. The maps constrain the 3D seismic-velocity structure of the crust and upper mantle underlying Ireland and the Irish Sea. {9} Lebedev, S., T. Meier, R. D. van der Hilst. Asthenospheric flow and origin of volcanism in the Baikal Rift area, Earth Planet. Sci. Lett., 249, 415-424, 2006. Meier, T., K. Dietrich, B. Stockhert, H.P. Harjes, One-dimensional models of shear wave velocity for

  2. Ultracold atoms and their applications (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 28 October 2015)

    NASA Astrophysics Data System (ADS)

    2016-02-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS), "Ultracold atoms and their applications", was held in the conference hall of the Lebedev Physical Institute, RAS, on 28 October 2015.The papers collected in this issue were written based on talks given at the session:(1) Vishnyakova G A, Golovizin A A, Kalganova E S, Tregubov D O, Khabarova K Yu (Lebedev Physical Institute, Russian Academy of Sciences, Moscow; Moscow Institute of Physics and Technology (State University), Dolgoprudnyi, Moscow region), Sorokin V N, Sukachev D D, Kolachevsky N N (Lebedev Physical Institute, Russian Academy of Sciences, Moscow) "Ultracold lanthanides: from optical clock to a quantum simulator"; (2) Barmashova T V, Martiyanov K A, Makhalov V B (Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod), Turlapov A V (Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod; Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod) "Fermi liquid to Bose condensate crossover in a two-dimensional ultracold gas experiment"; (3) Taichenachev A V, Yudin V I, Bagayev S N (Institute of Laser Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk; Novosibirsk State University, Novosibirsk) "Ultraprecise optical frequency standards based on ultracold atoms: state of the art and prospects"; (4) Ryabtsev I I, Beterov I I, Tretyakov D B, Entin V M, Yakshina E A (Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk; Novosibirsk State University, Novosibirsk) "Spectroscopy of cold rubidium Rydberg atoms for applications in quantum information". • Ultracold lanthanides: from optical clock to a quantum simulator, G A Vishnyakova, A A Golovizin, E S Kalganova, V N Sorokin, D D Sukachev, D O Tregubov, K Yu Khabarova, N N Kolachevsky Physics-Uspekhi, 2016, Volume 59, Number 2, Pages 168–173 • Fermi liquid-to-Bose condensate crossover in a

  3. Global distribution of azimuthal anisotropy within the lithosphere, asthenosphere, and transition zone

    NASA Astrophysics Data System (ADS)

    Schaeffer, Andrew; Lebedev, Sergei

    2015-04-01

    We present our new global, azimuthally anisotropic model of the upper mantle, crust, and transition zone. We compare two versions of this new model, the rough SL2013svAr and smooth SL2013svA, which are constrained by a larger, updated waveform fit dataset (>900, 000 vertical component seismogram fits) than that used in the construction of the isotropic model SL2013sv (Schaeffer and Lebedev, 2013). These two anisotropy models are computed using a more precise regularization of anisotropy, which is tuned to honour the both the amplitude and orientation of the anisotropic terms uniformly, including near the poles. Automated, multimode waveform inversion was used to extract structural information from surface and S wave forms, yielding resolving power from the crust down to the transition zone. Our unprecedentedly large waveform dataset, with complementary high-resolution regional array subsets within larger global networks, produces improved resolution of global azimuthal anisotropy patterns. The model also reveals smaller scale patterns of 3D anisotropy variations related to regional lithospheric deformation and mantle flow, in particular in densely sampled regions. In oceanic regions, we examine the strength of azimuthal anisotropy, as a function of depth, spatial position with respect to the spreading ridge, and deviation in fast axis orientation from the current and fossil spreading directions. Furthermore, we explore correlations between anisotropic tomography models and a new reference frame developed such that the net rotation of spreading ridges is minimized (RNR; Becker et al, 2014). In continental regions, azimuthal anisotropy is more complex. Reconciling complementary observations given by shear wave splitting, surface-wave array analysis, and large-scale, global 3D models offers new insights into the mechanisms of continental deformation and the architecture and evolution of the lithosphere. Finally, quantitative comparisons with other recently published

  4. CALL FOR PAPERS: Optics and squeeze transformations after Einstein

    NASA Astrophysics Data System (ADS)

    Kim, Young S.; Man'ko, Margarita A.; Planat, Michel

    2005-01-01

    Journal of Optics B: Quantum and Semiclassical Optics will publish a special issue in connection with the 9th International Conference on Squeezed States and Uncertainty Relations, to be held in Besançon, France, on 2-6 May 2005. In 2005, the physics community celebrates the 100th anniversary of the publication of Einstein’s theories of relativity and quantum physics. To celebrate these great contributions to physics, the conference will include sessions on Einstein’s influence on modern optics and the foundations of quantum mechanics. Conference participants, as well as other researchers working in the field, are invited to submit research papers to this special issue of the journal. The topics to be covered include: • Superposition principle • Squeezed states • Uncertainty relations • Quantum state generation and characterization • Phase space and group representations in quantum physics • Quantum transforms in signal analysis • Information theory and quantum computing • Quantum interference, decoherence and entanglement measure • Quantum chaos and quantum control • Bell inequalities • Nonstationary Casimir effect • Quantum-like and mesoscopic systems Manuscripts should be submitted by 1 August 2005 as the special issue is scheduled for publication in March 2006. All papers will be peer reviewed and the normal refereeing standards of Journal of Optics B: Quantum and Semiclassical Optics will be maintained. The Editorial Division of IOP Publishing at the P N Lebedev Physical Institute in Moscow will oversee editorial procedures in association with the IOP Publishing office in Bristol. There are no page charges for publication. Submissions should preferably be in either standard LaTeX form or Microsoft Word. Advice on publishing your work in the journal, including specific information on figures, tables and references, may be found at www.iop.org/journals/authors. Manuscripts should be submitted by e-mail to the Guest Editors at IOPP@sci.lebedev

  5. CALL FOR PAPERS: Optics and squeeze transformations after Einstein

    NASA Astrophysics Data System (ADS)

    Kim, Young S.; Man'ko, Margarita A.; Planat, Michel

    2004-12-01

    Journal of Optics B: Quantum and Semiclassical Optics will publish a special issue in connection with the 9th International Conference on Squeezed States and Uncertainty Relations, to be held in Besançon, France, on 2-6 May 2005. In 2005, the physics community celebrates the 100th anniversary of the publication of Einstein’s theories of relativity and quantum physics. To celebrate these great contributions to physics, the conference will include sessions on Einstein’s influence on modern optics and the foundations of quantum mechanics. Conference participants, as well as other researchers working in the field, are invited to submit research papers to this special issue of the journal. The topics to be covered include: • Superposition principle • Squeezed states • Uncertainty relations • Quantum state generation and characterization • Phase space and group representations in quantum physics • Quantum transforms in signal analysis • Information theory and quantum computing • Quantum interference, decoherence and entanglement measure • Quantum chaos and quantum control • Bell inequalities • Nonstationary Casimir effect • Quantum-like and mesoscopic systems Manuscripts should be submitted by 1 August 2005 as the special issue is scheduled for publication in March 2006. All papers will be peer reviewed and the normal refereeing standards of Journal of Optics B: Quantum and Semiclassical Optics will be maintained. The Editorial Division of IOP Publishing at the P N Lebedev Physical Institute in Moscow will oversee editorial procedures in association with the IOP Publishing office in Bristol. There are no page charges for publication. Submissions should preferably be in either standard LaTeX form or Microsoft Word. Advice on publishing your work in the journal, including specific information on figures, tables and references, may be found at www.iop.org/journals/authors. Manuscripts should be submitted by e-mail to the Guest Editors at IOPP@sci.lebedev

  6. Parameters of the turbulence of the interplanetary plasma derived from scintillation observations of the quasar 3C 48 at the solar-activity minimum

    NASA Astrophysics Data System (ADS)

    Glubokova, S. K.; Tyul'bashev, S. A.; Chashei, I. V.; Shishov, V. I.

    2013-08-01

    Temporal spectra of interplanetary scintillations of the strong radio source 3C 48 based on 111 MHz observations on the Large Scanning Antenna of the Lebedev Physical Institute obtained near the solar-activity minimum are analyzed. Measurements of the temporal spectrum of the scintillations are used to estimate the angular size of the source, the velocity of inhomogeneities, and the power-law index for the spatial spectrum of the turbulence in the interplanetary plasma. The mean angular size of the source is θ 0 = 0.326″ ± 0.016″, and the mean index for the three-dimensional turbulence spectrum is n = 3.7 ± 0.2. There is some evidence that n decreases in the transition from the fast, high-speed to the slow, low-latitude solar wind.

  7. X-pinch. Part II

    NASA Astrophysics Data System (ADS)

    Pikuz, S. A.; Shelkovenko, T. A.; Hammer, D. A.

    2015-06-01

    Results of experimental studies of the X-pinch since its invention and implementation in 1982 at the Lebedev Physical Institute are presented. The review consists of two parts. The first part briefly outlines the history of creation and studies of X-pinches, describes the diagnostic techniques and devices developed during these studies, and presents the main results obtained in studying the physical processes occurring in the X-pinch. The second part is devoted to the results of detailed studies of the spatial, temporal, and spectral characteristics of the X-pinch hot spot—the region where the highest plasma parameters are achieved and which is a source of X-ray emission with extreme parameters. Some results of X-pinch simulations are also presented.

  8. Dynamic phenomena in the Earth's atmosphere during January-May 1994

    NASA Astrophysics Data System (ADS)

    Makhmutov, Vladimir; Svirzhevskaya, Albina; Svirzhevsky, Nikolai; Stozhkov, Yuri; Bazilevskaya, Galina

    The long-term measurements of cosmic ray fluxes in the atmosphere by radiosound-detector are carried out by the Lebedev Physical Institute RAS since 1957 till now at several geomagnetic locations including northern and southern polar regions and mid latitudes. We concentrate on energetic electron precipitation events observed in the Earth’s polar atmosphere in January-May 1994. During this time very extended transequatorial coronal holes were observed at the Sun. They produced the high-speed solar wind streams which caused the recurrent interplanetary disturbances and geomagnetic storms. We present the energetic and temporal characteristics of precipitating electron events recorded in the atmosphere during this period. We discuss the origin of these events and their relation to the interplanetary and geomagnetic disturbances.

  9. X-pinch. Part II

    SciTech Connect

    Pikuz, S. A. Shelkovenko, T. A.; Hammer, D. A.

    2015-06-15

    Results of experimental studies of the X-pinch since its invention and implementation in 1982 at the Lebedev Physical Institute are presented. The review consists of two parts. The first part briefly outlines the history of creation and studies of X-pinches, describes the diagnostic techniques and devices developed during these studies, and presents the main results obtained in studying the physical processes occurring in the X-pinch. The second part is devoted to the results of detailed studies of the spatial, temporal, and spectral characteristics of the X-pinch hot spot—the region where the highest plasma parameters are achieved and which is a source of X-ray emission with extreme parameters. Some results of X-pinch simulations are also presented.

  10. A crack problem with four distinct harmonic functions

    NASA Technical Reports Server (NTRS)

    Sih, G. C.; Kassir, M. K.

    1972-01-01

    The problem of an elastic solid containing a semi-infinite plane crack subjected to concentrated shears parallel to the edge of the crack is considered. A closed form solution using four distinct harmonic functions (none of which can be taken arbitrarily) is found to satisfy the finite displacement and inverse square root stress singularity at the edge of the crack. Explicit expressions in terms of elementary functions are given for the distribution of stress and displacement in the solid. These are obtained by employing Fourier and Kontorovich-Lebedev integral transforms and certain singular solutions of Laplace equations in three dimensions. The variations of the intensity of the local stress field along the crack border are shown graphically. An example is presented, which is in contrast with the conclusion established in the literature that one of the four Papkovich-Neuber functions in three-dimensional elasticity may be arbitrarily set to zero.

  11. A specialized layering module for high rep-rate production of free standing HiPER targets

    NASA Astrophysics Data System (ADS)

    Aleksandrova, I.; Belolipetskiy, A.; Koresheva, E.; Koshelev, E.; Malinina, E.; Mitina, L.; Panina, L.; Chtcherbakov, V.; Tolley, M.; Edwards, C.; Spindloe, C.

    2013-11-01

    The target supply system is a necessary requirement for fueling a future energy source (reactor) with a high rep-rate: 0.1-10 Hz. At the Lebedev Physical Institute (LPI), significant progress has been made in the technology based on rapid fuel layering inside moving free-standing targets that is referred to as FST (Free-Standing Targets) layering method. This allows creating a continuously or repeatable operating FST supply system, the development of which at LPI dates back to 1980s. Therefore, the LPI is in the position to propose the use of FST technologies for HiPER facility operation (conceptual design and prototype realization). Here we report on our most significant results on the development of a specialized layering module prototype for repeatable formation of HiPER free-standing cryogenic targets.

  12. Controlling Plasma Channels through Ultrashort Laser Pulse Filamentation

    NASA Astrophysics Data System (ADS)

    Ionin, Andrey; Seleznev, Leonid; Sunchugasheva, Elena

    2013-09-01

    A review of studies fulfilled at the Lebedev Institute in collaboration with the Moscow State University and Institute of Atmospheric Optics in Tomsk on influence of various characteristics of ultrashort laser pulse on plasma channels formed under its filamentation is presented. Filamentation of high-power laser pulses with wavefront controlled by a deformable mirror, with cross-sections spatially formed by various diaphragms and with different wavelengths was experimentally and numerically studied. An application of plasma channels formed due to filamentation of ultrashort laser pulse including a train of such pulses for triggering and guiding long electric discharges is discussed. The research was supported by RFBR Grants 11-02-12061-ofi-m and 11-02-01100, and EOARD Grant 097007 through ISTC Project 4073 P

  13. The RadioAstron Green Bank Earth Station

    NASA Astrophysics Data System (ADS)

    Ford, H. Alyson; Anderson, Robert; Belousov, Konstantin; Brandt, Joseph J.; Ford, John M.; Kanevsky, Boris; Kovalenko, Anatoly; Kovalev, Yuri Y.; Maddalena, Ronald J.; Sergeev, Sergei; Smirnov, Alexander; Watts, Galen; Weadon, Timothy Lee

    2014-07-01

    We present the design, commissioning, and initial results of the Green Bank Earth Station (GBES), a RadioAstron data downlink station located at the National Radio Astronomy Observatory (NRAO) in Green Bank, West Virginia. The GBES uses the modernized and refurbished NRAO 140ft telescope. Antenna optics were refurbished with new motors and drives fitted to the secondary mirror positioning system, and the deformable subreflector was refurbished with a new digital controller and new actuators. A new monitor and control system was developed for the 140ft and is based on that of the Green Bank Telescope (GBT), allowing satellite tracking via a simple scheduling block. Tools were developed to automate antenna pointing during tracking. Data from the antenna control systems and logs are retained and delivered with the science and telemetry data for processing at the Astro Space Center (ASC) of the Lebedev Physical Institute (LPI) of the Russian Academy of Sciences and the mission control centre, Lavochkin Association.

  14. Application of Papkovich-Neuber potentials to a crack problem.

    NASA Technical Reports Server (NTRS)

    Kassir, M. K.; Sih, G. C.

    1973-01-01

    The problem of an elastic solid containing a semi-infinite plane crack subjected to concentrated shears parallel to the edge of the crack is considered in this paper. A closed form solution using four harmonic functions is found to satisfy the finite displacement and inverse square root stress singularity at the edge of the crack. Explicit expressions in terms of elementary functions are given for the distribution of stress and displacement in the solid. These are obtained by employing Fourier and Kontorovich-Lebedev integral transforms and certain singular solutions of Laplace equations in three dimensions. The variations of the intensity of the local stress field along the crack border are shown graphically.

  15. The spectral theory of a functional-difference operator in conformal field theory

    NASA Astrophysics Data System (ADS)

    Takhtajan, L. A.; Faddeev, L. D.

    2015-04-01

    We consider the functional-difference operator H=U+U-1+V, where U and V are the Weyl self-adjoint operators satisfying the relation UV=q2VU, q=eπ iτ, τ>0. The operator H has applications in the conformal field theory and representation theory of quantum groups. Using the modular quantum dilogarithm (a q-deformation of the Euler dilogarithm), we define the scattering solution and Jost solutions, derive an explicit formula for the resolvent of the self-adjoint operator H on the Hilbert space L2( R), and prove the eigenfunction expansion theorem. This theorem is a q-deformation of the well-known Kontorovich-Lebedev transform in the theory of special functions. We also present a formulation of the scattering theory for H.

  16. Ultrasoft fermionic excitation at finite chemical potential

    NASA Astrophysics Data System (ADS)

    Blaizot, Jean-Paul; Satow, Daisuke

    2014-05-01

    It has been suggested previously that an ultrasoft fermionic excitation develops, albeit with a small spectral weight, in a system of massless fermions and scalar bosons with Yukawa interaction at high temperature T. In this paper we study how this excitation is modified at finite chemical potential μ. We relate the existence of the ultrasoft mode to symmetries, in particular charge conjugation, and a supersymmetry of the free system which is spontaneously broken by finite temperature and finite density effects, as argued earlier by Lebedev and Smilga. A nonvanishing chemical potential breaks both symmetries explicitly and maximally at zero temperature where the mode ceases to exist. A detailed calculation indicates that the ultrasoft excitation persists as long as T≥0.71μ.

  17. Confirmation of Pulsed Radio Emission from the Pulsar J1907+0919 (Shitov Radio Pulsar, SGR 1900+14)

    NASA Astrophysics Data System (ADS)

    Glushak, A. P.; Losovsky, B. Ya.; Dumsky, D. V.

    2015-10-01

    Observations at a frequency of 111 MHz with the Large Phased Array at the Pushchino Radio Astronomy Observatory of the Astro Space Center of the P.N. Lebedev Physical Institute confirm the pulsed radio emission of the X-ray pulsar J1907+0919 that is a counterpart of the magnetar SGR 1900+14. Its pulsed radio emission was discovered earlier by Shitov (1999). A flux density periodogram is built. A new spin period P = 5.22756(42) s and flux density 50± 5~mJy are measured at the Epoch 56834.6 MJD. A value of the pulsar radio emission spectral index is estimated as < -4.3. This radio spectrum is one of the steepest among the spectra of known pulsars.

  18. Formation of a steady supersonic solar wind flow.

    NASA Astrophysics Data System (ADS)

    Lotova, N. A.; Subaev, I. A.; Korelov, O. A.

    2014-10-01

    A consistent study of the solar wind has been extended to a wide region of interplanetary space, up to distances from the Sun R ≥ 90 R s. Experiments are carried out with the radio telescopes of the Pushchino Radio Astronomy Observatory (Astrospace Center, Lebedev physical Institute, Russian Academy of Sciences): DKR-1000 (λ ≃ 2.7-2.9 m) and RT-22 (λ ≃ 1.35 cm), respectively. The radio-wave scattering characteristics, the scattering angle θ(R) and the scintillation index m(R), are studied. The formation of a steady supersonic solar wind is associated with a sequence of four stages whose scale in different solar wind streams changes within the range 10-23 R s , depending on the initial stream speed. These circumstances should be taken into account when predicting the state of the near space using data on the solar wind in regions of the interplanetary medium close to the Sun.

  19. Diagnostics of Low Temperature Plasma by CO Laser Radiation (5.0-7.5 μm)

    NASA Astrophysics Data System (ADS)

    Klimachev, Yu M.

    2016-01-01

    A review of the work conducted in Gas Lasers Laboratory of P.N. Lebedev Physical Institute of the Russian Academy of Sciences and devoted to a research of the diagnostic of dynamics of small-signal gain, temperature and population of vibrational levels in the CO-containing gas mixtures excited by pulsed electron-beam sustained discharge is presented. With the help of laser probing techniques the nonlinear Zeeman splitting of the NO lines in a strong magnetic field was also investigated. The studies of gain of the train of nanosecond pulses allowed us to estimate the intensity of the gain saturation of the active medium of the pulsed electron-beam sustained discharge CO laser.

  20. Electric dipole sheets in BaTiO3/BaZrO3 superlattices

    NASA Astrophysics Data System (ADS)

    Jiang, Zhijun; Xu, Bin; Li, Fei; Wang, Dawei; Jia, C.-L.

    2015-01-01

    We investigate two-dimensional electric dipole sheets in the superlattice made of BaTiO3 and BaZrO3 using first-principles-based Monte Carlo simulations and density functional calculations. Electric dipole domains and complex patterns are observed and complex dipole structures with various symmetries (e.g., P m a 2 ,C m c m , and P m c 21 ) are further confirmed by density functional calculations, which are found to be almost degenerate in energy with the ferroelectric ground state of the A m m 2 symmetry, therefore strongly resembling magnetic sheets. More complex dipole patterns, including vortices and antivortices, are also observed, which may constitute the intermediate states that overcome the high-energy barrier of different polarization orientations previously predicted by A. I. Lebedev [Phys. Solid State 55, 1198 (2013), 10.1134/S1063783413060218]. We also show that such system possesses large electrostrictive effects that may be technologically important.

  1. Temporal, latitude and altitude absorbed dose dependences

    NASA Astrophysics Data System (ADS)

    Stozhkov, Y.; Svirzhevsky, N.; Bazilevskaya, G.

    The regular balloon measurements in the Earth's atmosphere are carried on at the Lebedev Physical Institute since 1957. The regular balloon flights have been made at the high latitude stations (near Murmansk - northern hemisphere and Mi ny -r Antarctica) and at the middle latitude (Moscow). Based on these long-term measurements as well as on the latitude data obtained in the several Soviet Antarctic expeditions the calculations of absorbed doses were fulfilled for altitudes of 10, 15, 20 and 30 km. The absorbed dose dependences on the geomagnetic cutoff rigidities and the phase of the 11-year solar cycle were found. The evaluation of the solar proton events and energetic electron precipitation contributions to the absorbed dose enhancements was made.

  2. Exploring Rotations Due to Radiation Pressure: 2-D to 3-D Transition Is Interesting!

    NASA Astrophysics Data System (ADS)

    Waxman, Michael A.

    2010-01-01

    Radiation pressure is an important topic within a standard physics course (see, in particular, Refs. 1 and 2). The physics of radiation pressure is described, the magnitude of it is derived, both for the case of a perfectly absorbing surface and of a perfect reflector, and various applications of this interesting effect are discussed, such as space sailing1,2 or optical "tweezers."2 There are, however, relatively few problems that are available as end-of-the-chapter exercises. Below I present a problem I composed that I assign to my students in class and that facilitates a lively class discussion. This problem is somewhat reminiscent of the setting used by P. N. Lebedev in his historic experiments on proving the existence of radiation pressure.

  3. Comment on ``Damping of energetic gluons and quarks in high-temperature QCD''

    NASA Astrophysics Data System (ADS)

    Rebhan, Anton

    1992-07-01

    Burgess and Marini have recently pointed out that the leading contribution to the damping rate of energetic gluons and quarks in the QCD plasma, given by γ=cg2ln(1/g)T, can be obtained by simple arguments obviating the need of a fully resummed perturbation theory as developed by Braaten and Pisarski. Their calculation confirmed previous results of Braaten and Pisarski, but contradicted those proposed by Lebedev and Smilga. While agreeing with the general considerations made by Burgess and Marini, I correct their actual calculation of the damping rates, which is based on a wrong expression for the static limit of the resummed gluon propagator. The effect of this, however, turns out to be canceled fortuitously by another mistake, so as to leave all of their conclusions unchanged. I also verify the gauge independence of the results, which in the corrected calculation arises in a less obvious manner.

  4. Comment on Damping of energetic gluons and quarks in high-temperature QCD''

    SciTech Connect

    Rebhan, A. )

    1992-07-01

    Burgess and Marini have recently pointed out that the leading contribution to the damping rate of energetic gluons and quarks in the QCD plasma, given by {gamma}={ital cg}{sup 2}ln(1/{ital g}){ital T}, can be obtained by simple arguments obviating the need of a fully resummed perturbation theory as developed by Braaten and Pisarski. Their calculation confirmed previous results of Braaten and Pisarski, but contradicted those proposed by Lebedev and Smilga. While agreeing with the general considerations made by Burgess and Marini, I correct their actual calculation of the damping rates, which is based on a wrong expression for the static limit of the resummed gluon propagator. The effect of this, however, turns out to be canceled fortuitously by another mistake, so as to leave all of their conclusions unchanged. I also verify the gauge independence of the results, which in the corrected calculation arises in a less obvious manner.

  5. Challenges in astrophysics (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 25 January 2012)

    NASA Astrophysics Data System (ADS)

    2012-09-01

    On 25 January 2012, the scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS), entitled as "Challenges in astrophysics", was held at the conference hall of the Lebedev Physical Institute, RAS.The following reports were put on the session agenda posted on the website www.gpad.ac.ru of the RAS Physical Sciences Division: (1) Stepanov A V (Central (Pulkovo) Astronomical Observatory, RAS, St. Petersburg) "Coronal seismology";2) Yakovlev D G (Ioffe Physical Technical Institute, St. Petersburg St. Petersburg State Polytechnical University, St. Petersburg) "Superfluid neutron stars".The papers written on the base of the oral reports are published below. • Coronal seismology, A V Stepanov, V V Zaitsev, V M Nakariakov Physics-Uspekhi, 2012, Volume 55, Number 9, Pages 929-935 • Superfluid neutron stars, P S Shternin, D G Yakovlev Physics-Uspekhi, 2012, Volume 55, Number 9, Pages 935-941

  6. CENTER FOR PULSED POWER DRIVEN HIGH ENERGY DENSITY PLASMA STUDIES

    SciTech Connect

    Professor Bruce R. Kusse; Professor David A. Hammer

    2007-04-18

    This annual report summarizes the activities of the Cornell Center for Pulsed-Power-Driven High-Energy-Density Plasma Studies, for the 12-month period October 1, 2005-September 30, 2006. This period corresponds to the first year of the two-year extension (awarded in October, 2005) to the original 3-year NNSA/DOE Cooperative Agreement with Cornell, DE-FC03-02NA00057. As such, the period covered in this report also corresponds to the fourth year of the (now) 5-year term of the Cooperative Agreement. The participants, in addition to Cornell University, include Imperial College, London (IC), the University of Nevada, Reno (UNR), the University of Rochester (UR), the Weizmann Institute of Science (WSI), and the P.N. Lebedev Physical Institute (LPI), Moscow. A listing of all faculty, technical staff and students, both graduate and undergraduate, who participated in Center research activities during the year in question is given in Appendix A.

  7. Application of efficient algorithm for solving six-dimensional molecular Ornstein-Zernike equation.

    PubMed

    Ishizuka, R; Yoshida, N

    2012-03-21

    In this article, we propose an efficient algorithm for solving six-dimensional molecular Ornstein-Zernike (MOZ) equation. In this algorithm, the modified direct inversion in iterative subspace, which is known as the fast convergent method for solving the integral equation theory of liquids, is adopted. This method is found to be effective for the convergence of the MOZ equation with a simple initial guess. For the accurate averaging of the correlation functions over the molecular orientations, we use the Lebedev-Laikov quadrature. The appropriate number of grid points for the quadrature is decided by the analysis of the dielectric constant. We also analyze the excess chemical potential of aqueous ions and compare the results of the MOZ with those of the reference interaction site model. PMID:22443748

  8. Application of efficient algorithm for solving six-dimensional molecular Ornstein-Zernike equation

    NASA Astrophysics Data System (ADS)

    Ishizuka, R.; Yoshida, N.

    2012-03-01

    In this article, we propose an efficient algorithm for solving six-dimensional molecular Ornstein-Zernike (MOZ) equation. In this algorithm, the modified direct inversion in iterative subspace, which is known as the fast convergent method for solving the integral equation theory of liquids, is adopted. This method is found to be effective for the convergence of the MOZ equation with a simple initial guess. For the accurate averaging of the correlation functions over the molecular orientations, we use the Lebedev-Laikov quadrature. The appropriate number of grid points for the quadrature is decided by the analysis of the dielectric constant. We also analyze the excess chemical potential of aqueous ions and compare the results of the MOZ with those of the reference interaction site model.

  9. Lightcurve analysis for numbered asteroids 1351, 1589, 2778, 5076, 5892, and 6386

    NASA Astrophysics Data System (ADS)

    Warner, Brian D.

    2004-06-01

    The lightcurves of six numbered asteroids obtained in late 2003 were analyzed. The following synodic periods and amplitudes were determined. 1351 Uzbekistania: 73.90 ± 0.02h, 0.34 ± 0.02m; 1589 Fanatica: 2.58 ± 0.05h, 0.16 ± 0.02m; 2778 Tangshan: 3.461 ± 0.020h, 0.25 ± 0.03m; 5076 Lebedev-Kumach: 3.2190 ± 0.0005h, 0.14 ± 0.02m; (5892) 1981 YS1: 10.60 ± 0.02h, 0.26 ± 0.03m; and (6386) 1989 NK1: 3.1381 ± 0.0005h, 0.08 ± 0.02m.

  10. High-cadence observations of CME initiation and plasma dynamics in the corona with TESIS on board CORONAS-Photon

    NASA Astrophysics Data System (ADS)

    Bogachev, Sergey; Kuzin, Sergey; Zhitnik, I. A.; Bugaenko, O. I.; Goncharov, A. L.; Ignatyev, A. P.; Krutov, V. V.; Lomkova, V. M.; Mitrofanov, A. V.; Nasonkina, T. P.; Oparin, S. N.; Petzov, A. A.; Shestov, S. V.; Slemzin, V. A.; Soloviev, V. A.; Suhodrev, N. K.; Shergina, T. A.

    The TESIS is an ensemble of space instruments designed in Lebedev Institute of Russian Academy of Sciences for spectroscopic and imaging investigation of the Sun in EUV and soft X-ray spectral range with high spatial, temporal and spectral resolution. From 2009 January, when TESIS was launched onboard the Coronas-Photon satellite, it provided about 200 000 new images and spectra of the Sun, obtained during one of the deepest solar minimum in last century. Because of the wide field of view (4 solar radii) and high sensitivity, TESIS provided high-quality data on the origin and dynamics of eruptive prominences and CMEs in the low and intermediate solar corona. TESIS is also the first EUV instrument which provided high-cadence observations of coronal bright points and solar spicules with temporal resolution of a few seconds. We present first results of TESIS observations and discuss them from a scientific point of view.

  11. Tokamaks: from A D Sakharov to the present (the 60-year history of tokamaks)

    NASA Astrophysics Data System (ADS)

    Azizov, E. A.

    2012-02-01

    The paper is prepared on the basis of the report presented at the session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) at the Lebedev Physical Institute, RAS on 25 May 2011, devoted to the 90-year jubilee of Academician Andrei D Sakharov - the initiator of controlled nuclear fusion research in the USSR. The 60-year history of plasma research work in toroidal devices with a longitudinal magnetic field suggested by Andrei D Sakharov and Igor E Tamm in 1950 for the confinement of fusion plasma and known at present as tokamaks is described in brief. The recent (2006) agreement among Russia, the EU, the USA, Japan, China, the Republic of Korea, and India on the joint construction of the international thermonuclear experimental reactor (ITER) in France based on the tokamak concept is discussed. Prospects for using the tokamak as a thermonuclear (14 MeV) neutron source are examined.

  12. Ultrastrong light fields (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 29 October 2014)

    NASA Astrophysics Data System (ADS)

    2015-01-01

    On 29 October 2014, the scientific session "Super strong light fields" of the Physical Sciences Division (PSD), Russian Academy of Sciences (RAS), was held at the conference hall of the Lebedev Physical Institute, RAS.The agenda of the session announced on the website http://www.gpad.ac.ru of the PSD RAS contains the reports: (1) Bychenkov V Yu (Lebedev Physical Institute, RAS, Moscow) "Laser acceleration of ions: New results and prospects for applications"; (2) Kostyukov I Yu (Institute of Applied Physics, RAS, Nizhnii Novgorod) "Plasma methods for electron acceleration: the state of the art and outlook"; (3) Zheltikov A M (Lomonosov Moscow State University, Moscow) "Nonlinear optics of mid-IR ultrashort pulses"; (4) Narozhnyi N B, Fedotov A M (Moscow Engineering Physics Institute, Nuclear Research University, Moscow) "Quantum electrodynamics cascades in intense laser fields."Papers written on the basis of oral presentations 1-4 are published below. • Laser acceleration of ions: recent results and prospects for applications, V Yu Bychenkov, A V Brantov, E A Govras, V F Kovalev Physics-Uspekhi, 2015, Volume 58, Number 1, Pages 71-81 • Plasma-based methods for electron acceleration: current status and prospects, I Yu Kostyukov, A M Pukhov Physics-Uspekhi, 2015, Volume 58, Number 1, Pages 81-88 • Subterawatt femtosecond pulses in the mid-infrared range: new spatiotemporal dynamics of high-power electromagnetic fields, A V Mitrofanov, D A Sidorov-Biryukov, A A Voronin, A Pugžlys, G Andriukaitis, E A Stepanov, S Ališauskas, T Flöri, A B Fedotov, V Ya Panchenko, A Baltuška, A M Zheltikov Physics-Uspekhi, 2015, Volume 58, Number 1, Pages 89-94 • Quantum-electrodynamic cascades in intense laser fields, N B Narozhny, A M Fedotov Physics-Uspekhi, 2015, Volume 58, Number 1, Pages 95-102

  13. CONFERENCES AND SYMPOSIA Commemoration of the 85th birthday of S I Syrovatskii(Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 26 May 2010)

    NASA Astrophysics Data System (ADS)

    2010-12-01

    A scientific session of the Physical Sciences Division, Russian Academy of Sciences (RAS), was held on 26 May 2010 at the conference hall of the Lebedev Physical Institute, RAS. The session was devoted to the 85th birthday of S I Syrovatskii. The program announced on the web page of the RAS Physical Sciences Division (www.gpad.ac.ru) contained the following reports: (1) Zelenyi L M (Space Research Institute, RAS, Moscow) "Current sheets and reconnection in the geomagnetic tail"; (2) Frank A G (Prokhorov General Physics Institute, RAS, Moscow) "Dynamics of current sheets as the cause of flare events in magnetized plasmas"; (3) Kuznetsov V D (Pushkov Institute of Terrestrial Magnetism, the Ionosphere, and Radio Wave Propagation, RAS, Troitsk, Moscow region) "Space research on the Sun"; (4) Somov B V (Shternberg Astronomical Institute, Lomonosov Moscow State University, Moscow) "Strong shock waves and extreme plasma states"; (5) Zybin K P (Lebedev Physical Institute, RAS, Moscow) "Structure functions for developed turbulence"; (6) Ptuskin V S (Pushkov Institute of Terrestrial Magnetism, the Ionosphere, and Radio Wave Propagation, RAS, Troitsk, Moscow region) "The origin of cosmic rays." Papers based on reports 1-4 and 6 are published in what follows. • Metastability of current sheets, L M Zelenyi, A V Artemyev, Kh V Malova, A A Petrukovich, R Nakamura Physics-Uspekhi, 2010, Volume 53, Number 9, Pages 933-941 • Dynamics of current sheets underlying flare-type events in magnetized plasmas, A G Frank Physics-Uspekhi, 2010, Volume 53, Number 9, Pages 941-947 • Space research of the Sun, V D Kuznetsov Physics-Uspekhi, 2010, Volume 53, Number 9, Pages 947-954 • Magnetic reconnection in solar flares, B V Somov Physics-Uspekhi, 2010, Volume 53, Number 9, Pages 954-958 • The origin of cosmic rays, V S Ptuskin Physics-Uspekhi, 2010, Volume 53, Number 9, Pages 958-961

  14. Global distribution of azimuthal anisotropy within the upper mantle and the crust

    NASA Astrophysics Data System (ADS)

    Schaeffer, Andrew; Lebedev, Sergei

    2014-05-01

    We present our new global, azimuthally anisotropic model of the upper mantle and the crust. We compare two versions of this new model, the rough SL2013svAr and smooth SL2013svA, which are constrained by a larger, updated waveform fit dataset (>900, 000 vertical component seismogram fits) than that used in the construction of the isotropic model SL2013sv (Schaeffer and Lebedev, 2013). These two anisotropy models are computed using a more precise regularization of anisotropy, which is tuned to honour the both the amplitude and orientation of the anisotropic terms uniformly, including near the poles. Automated, multimode waveform inversion was used to extract structural information from surface and S wave forms, yielding resolving power from the crust down to the transition zone. Our unprecedentedly large waveform dataset, with complementary high-resolution regional arrays in additional to global networks, produces improved resolution of global azimuthal anisotropy patterns. The model also reveals smaller scale patterns of 3D anisotropy variations related to regional lithospheric deformation and mantle flow, in particular in densely sampled regions. In oceanic regions, we examine the strength of azimuthal anisotropy, as a function of depth, spatial position with respect to the spreading ridge, and deviation in fast axis orientation from the current and fossil spreading directions. In continental regions, azimuthal anisotropy is more complex. Reconciling complementary observations given by shear wave splitting, surface-wave array analysis, and large-scale, global 3D models offers new insights into the mechanisms of continental deformation and the architecture and evolution of the lithosphere. Finally, quantitative comparisons with other recently published models demonstrate which features are consistently resolved across the different models, and therefore provide a means to estimate the robustness of anisotropic patterns and amplitudes. Reference: Schaeffer, A. J

  15. A High-resolution 3D Geodynamical Model of the Present-day India-Asia Collision System

    NASA Astrophysics Data System (ADS)

    Kaus, B.; Baumann, T.

    2015-12-01

    We present a high-resolution, 3D geodynamic model of the present-day India-Asia collision system. The model is separated into multiple tectonic blocks, for which we estimate the first order rheological properties and the impact on the dynamics of the collision system. This is done by performing systematic simulations with different rheologies to minimize the misfit to observational constraints such as the GPS-velocity field. The simulations are performed with the parallel staggered grid FD code LaMEM using a numerical resolution of at least 512x512x256 cells to resolve dynamically important shear zones reasonably well. A fundamental part of this study is the reconstruction of the 3D present-day geometry of Tibet and the adjacent regions. Our interpretations of crust and mantle lithosphere geometry are jointly based on a globally available shear wave tomography (Schaeffer and Lebedev, 2013) and the Crust 1.0 model (Laske et al. http://igppweb.ucsd.edu/~gabi/crust1.html). We regionally refined and modified our interpretations based on seismicity distributions and focal mechanisms and incorporated regional receiver function studies to improve the accuracy of the Moho in particular. Results suggest that we can identify at least one "best-fit" solution in terms of rheological model properties that reproduces the observed velocity field reasonably well, including the strong rotation of the GPS velocity around the eastern syntax of the Himalaya. We also present model co-variances to illustrate the trade-offs between the rheological model parameters, their respective uncertainties, and the model fit. Schaeffer, A.J., Lebedev, S., 2013. Global shear speed structure of the upper mantle and transition zone. Geophysical Journal International 194, 417-449. doi:10.1093/gji/ggt095

  16. Chemocatalytic conversion of ethanol into butadiene and other bulk chemicals.

    PubMed

    Angelici, Carlo; Weckhuysen, Bert M; Bruijnincx, Pieter C A

    2013-09-01

    The development of new and improved processes for the synthesis of bio-based chemicals is one of the scientific challenges of our time. These new discoveries are not only important from an environmental point of view, but also represent an important economic opportunity, provided that the developed processes are selective and efficient. Bioethanol is currently produced from renewable resources in large amounts and, in addition to its use as biofuel, holds considerable promise as a building block for the chemical industry. Indeed, further improvements in production, both in terms of efficiency and feedstock selection, will guarantee availability at competitive prices. The conversion of bioethanol into commodity chemicals, in particular direct 'drop-in' replacements is, therefore, becoming increasingly attractive, provided that the appropriate (catalytic) technology is in place. The production of green and renewable 1,3-butadiene is a clear example of this approach. The Lebedev process for the one-step catalytic conversion of ethanol to butadiene has been known since the 1930s and has been applied on an industrial scale to produce synthetic rubber. Later, the availability of low-cost oil made it more convenient to obtain butadiene from petrochemical sources. The desire to produce bulk chemicals in a sustainable way and the availability of low-cost bioethanol in large volumes has, however, resulted in a renaissance of this old butadiene production process. This paper reviews the catalytic aspects associated with the synthesis of butadiene via the Lebedev process, as well as the production of other, mechanistically related bulk chemicals that can be obtained from (bio)ethanol. PMID:23703747

  17. Isostasy, Stress and Gravitational Potential Energy in the Southern Atlantic - Insights from Satellite Gravity Observations

    NASA Astrophysics Data System (ADS)

    Goetze, H. J.; Klinge, L.; Scheck-Wenderoth, M.; Dressel, I.; Sippel, J.

    2015-12-01

    New satellite gravity fields e.g. EGM2008, GoCo3S and very recently EIGEN-6C4 (Förste et al., 2014) provide high-accuracy and globally uniform information of the Earth's gravity field and partly of its gradients. The main goal of this study is to investigate the impact of this new gravity field and its processed anomalies (Bouguer, Free-air and Vening-Meinesz residual fields) on lithospheric modelling of passive plate margins in the area of the Southern Atlantic. In an area fixed by the latitudes 20° N - 50° S and longitudes 70° W - 20° E we calculated station-complete Bouguer anomalies (bathymetry/topography corrected) both on- and offshore and compared them with the gravity effect of a velocity model which bases on S - waves tomography (Schaeffer and Lebedev, 2013). The corresponding maps provide more insight in the abnormal mass distribution of oceanic lithosphere and the ocean-continent transition zones on both sides of the Atlantic Ocean than Free-air anomalies which are masked by bathymetry. In a next step we calculated isostatic residual fields (Vening-Meinesz isostasy with regard to different lithospheric rigidities) to remove global components (long wavelengths) from the satellite gravity. The Isostatic residual field will be compared with the GPE (gravitational potential energy). GPE variations in the Southern Atlantic, relative to the reference state, were calculated as ΔGPE. Often the oceanic lithosphere is characterized by negative ∆GPE values indicating that the ocean basin is in compression. Differences from this observation will be compared with the state of stress in the area of the passive margins of South America and South Africa and the oceanic lithosphere in between. Schaeffer, A. J. and S. Lebedev, Global shear-speed structure of the upper mantle and transition zone. Geophys. J. Int., 194 (1), 417-449, 2013. doi:10.1093/gji/ggt095

  18. Seismic structure and dynamics of cratons: Stability and modification, continental collision and subduction

    NASA Astrophysics Data System (ADS)

    Lebedev, Sergei; Meier, Thomas; Schaeffer, Andrew J.; Agius, Matthew R.; Adam, Joanne M.-C.

    2014-05-01

    relatively low shear-wave speeds in the mantle lithosphere. This anomaly is present in regions of both Proterozoic and Archean crust, which suggests an alteration of the mantle lithosphere after the formation of the cratons. In orogenies, cratons generally resist deformation and subduction. Collisions of cratonic blocks, such as seen presently in the western part of the India-Asia convergence zone, can change the character of the orogeny, as well as the motions of the entire tectonic plates that are converging. Beneath western Tibet, cratonic Indian lithosphere has been stripped of its upper crust, pushed down underneath the thick Tibetan crust, and is now colliding with the Tarim Craton to the north. This recent deepening of the cold Indian lithosphere explains the exceptionally high shear speeds (up to 5.0 km/s) within it, higher than beneath any stable cratons with steady-state geotherms. High-velocity anomalies beneath central and eastern Tibet require negative thermal anomalies of hundreds of degrees at depths below 120-150 km, indicating, most likely, subducted Indian lithosphere. The active India-Asia convergence zone thus demonstrates different mechanisms of continental convergence, from craton-craton collision to underthrusting of a craton beneath thick orogenic crust and to shallow-angle subduction of cratonic lithosphere. References Agius, M. R., S. Lebedev. Tibetan and Indian lithospheres in the upper mantle beneath Tibet: Evidence from broadband surface-wave dispersion. Geochem. Geophys. Geosyst. 14, 4260-4281, doi:10.1002/ggge.20274, 2013. Legendre, C., T. Meier, S. Lebedev, W. Friederich, L. Viereck-Goette. A shear-wave velocity model of the European upper mantle from automated inversion of seismic shear and surface waveforms. Geophys. J. Int. 191, 282-304, 2012. Schaeffer, A. J., S. Lebedev. Global shear-speed structure of the upper mantle and transition zone. Geophys. J. Int. 194, 417-449, 2013.

  19. 110th anniversary of the birth of P A Cherenkov (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 17 December 2014)

    NASA Astrophysics Data System (ADS)

    2015-05-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) was held on 17 December 2014 at the conference hall of the Lebedev Physical Institute, RAS, devoted to the 110th anniversary of the birth of Academician P A Cherenkov. The agenda posted on the website of the Physical Sciences Division RAS http://www.gpad.ac.ru comprised the following reports: (1) Bashmakov Yu A (Lebedev Physical Institute, RAS, Moscow) "Prehistory of discovery"; (2) Kadmensky S G (Voronezh State University, Voronezh) "Cherenkov radiation as a serendipity phenomenon"; (3) Denisov S P (Russian Federation State Scientific Center 'Institute for High Energy Physics' of National Research Center 'Kurchatov Institute', Protvino, Moscow region) "Use of Cherenkov counters in accelerator experiments"; (4) Petrukhin A A (National Research Nuclear University 'MEPhI', Moscow) "Cherenkov NEVOD water detector"; (5) Dremin I M (Lebedev Physical Institute, RAS, Moscow) "Cherenkov radiation from gluons in a nuclear medium"; (6) Domogatsky G V (Institute for Nuclear Research, RAS, Moscow) "Cherenkov detectors for high-energy neutrino astrophysics"; (7) Kravchenko E A (Budker Institute of Nuclear Physics, SB RAS, Novosibirsk) "Cherenkov detectors with aerogel radiators"; (8) Malinovski E I (Institute for Nuclear Research, RAS, Moscow) "Cherenkov total absorption spectrometers for high-energy electrons and photons"; (9) Maltseva Yu I (Budker Institute of Nuclear Physics, SB RAS, Novosibirsk) "Distributed beam loss monitor based on the Cherenkov effect in an optical fiber". Papers based on oral reports 1-4, 6-9 are presented below. Some aspects of report 5 can be found in the review by I M Dremin and A V Leonidov published in 2010 in Physics-Uspekhi (Vol. 53, p. 1123). • Cherenkov radiation: from discovery to RICH, Yu A Bashmakov Physics-Uspekhi, 2015, Volume 58, Number 5, Pages 467-471 • Cherenkov radiation as a serendipitous phenomenon, S G Kadmensky Physics

  20. CALL FOR PAPERS: Topical issue on the nonstationary Casimir effect and quantum systems with moving boundaries

    NASA Astrophysics Data System (ADS)

    Barton, Gabriel; Dodonov, Victor V.; Man'ko, Vladimir I.

    2004-05-01

    for publication in March 2005 and the deadline for submission of contributions is 1 August 2004. The Editorial Division of Institute of Physics Publishing at the P. N. Lebedev Physical Institute in Moscow will oversee editorial procedures in association with the main Publishing Office in Bristol. All contributions will be peer-reviewed in accordance with the normal refereeing procedures and standards of Journal of Optics B: Quantum and Semiclassical Optics. Submissions should preferably be in either standard LaTeX form or Microsoft Word. Advice on publishing your work in the journal may be found at www.iop.org/journals/authors/jopb. There are no page charges for publication. Contributions to the topical issue, quoting `Topical Issue/NCE', should be submitted by e-mail to IOPP@sci.lebedev.ru or as hard copy (enclosing the electronic code) to IOPP Division, P. N. Lebedev Physical Institute, Leninskii Prospect 53, Moscow 119991 Russia.

  1. Global variations in azimuthal anisotropy of the Earth's upper mantle and crust

    NASA Astrophysics Data System (ADS)

    Schaeffer, A. J.; Lebedev, S.

    2013-12-01

    Deformation within the Earth's crust and mantle often results in crystallographic preferred orientations that produce measurable seismic anisotropy. Shear wave splitting measurements have the benefit of excellent lateral resolution and are an unambiguous indicator of the presence of seismic anisotropy; however, they suffer from poor depth resolution (integrated measurement from CMB to surface), in addition to being geographically limited (measurements only made at seismometer locations). The analysis of surface wave propagation also provides insight into the azimuthal variations in wave-speed, but with significantly better depth resolution. Thanks to the rapid increase in the number of seismic stations around the world, increasingly accurate, high-resolution 3D models of azimuthal anisotropy can be calculated using surface-wave tomography. We present our new global, azimuthally anisotropic model of the upper mantle and the crust. Compared to its recent predecessor, SL2013sv (Schaeffer and Lebedev, 2013), it is constrained by an even larger waveform fit dataset (>900,000 versus 712,000 vertical-component seismograms, respectively) and was computed using a more precise regularization of anisotropy, tuned to honour the amplitude and orientation of the anisotropic terms uniformly, including near the poles. Automated, multimode waveform inversion was used to extract structural information from surface and S wave forms, yielding resolving power from the crust down to the transition zone. Our unprecedentedly large waveform dataset, with complementary high-resolution regional arrays (including USArray) and global network sub-sets within it, produces improved resolution of global azimuthal anisotropy patterns. The model also reveals smaller scale patterns of 3D anisotropy variations related to regional lithospheric deformation and mantle flow, in particular in densely sampled regions. In oceanic regions, we examine the strength of azimuthal anisotropy, as a function of

  2. Econophysics and evolutionary economics (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 2 November 2010)

    NASA Astrophysics Data System (ADS)

    2011-07-01

    The scientific session "Econophysics and evolutionary economics" of the Division of Physical Sciences of the Russian Academy of Sciences (RAS) took place on 2 November 2010 in the conference hall of the Lebedev Physical Institute, Russian Academy of Sciences. The session agenda announced on the website www.gpad.ac.ru of the RAS Physical Sciences Division listed the following reports: (1) Maevsky V I (Institute of Economics, RAS, Moscow) "The transition from simple reproduction to economic growth"; (2) Yudanov A Yu (Financial University of the Government of the Russian Federation, Moscow) "Experimental data on the development of fast-growing innovative companies in Russia"; (3) Pospelov I G (Dorodnitsyn Computation Center, RAS, Moscow) "Why is it sometimes possible to successfully model an economy? (4) Chernyavskii D S (Lebedev Physical Institute, RAS, Moscow) "Theoretical economics"; (5) Romanovskii M Yu (Prokhorov Institute of General Physics, RAS, Moscow) "Nonclassical random walks and the phenomenology of fluctuations of the yield of securities in the securities market"; (6) Dubovikov M M, Starchenko N V (INTRAST Management Company, Moscow Engineering Physics Institute, Moscow) "Fractal analysis of financial time series and the prediction problem"; Papers written on the basis of these reports are published below. • The transition from simple reproduction to economic growth, V I Maevsky, S Yu Malkov Physics-Uspekhi, 2011, Volume 54, Number 7, Pages 729-733 • High-growth firms in Russia: experimental data and prospects for the econophysical simulation of economic modernization, A Yu Yudanov Physics-Uspekhi, 2011, Volume 54, Number 7, Pages 733-737 • Equilibrium models of economics in the period of a global financial crisis, I G Pospelov Physics-Uspekhi, 2011, Volume 54, Number 7, Pages 738-742 • On econophysics and its place in modern theoretical economics, D S Chernavskii, N I Starkov, S Yu Malkov, Yu V Kosse, A V Shcherbakov Physics-Uspekhi, 2011, Volume

  3. Celebrating 50 years of the laser (Scientific session of the general meeting of the Physical Sciences Division of the Russian Academy of Sciences, 13 December 2010)

    NASA Astrophysics Data System (ADS)

    2011-08-01

    A scientific session of the general meeting of the Physical Sciences Division of the Russian Academy of Sciences (RAS) dedicated to the 50th anniversary of the creation of lasers was held in the Conference Hall of the Lebedev Physical Institute, RAS, on 13 December 2010. The agenda of the session announced on the website www.gpad.ac.ru of the RAS Physical Sciences Division listed the following reports: (1) Matveev V A, Bagaev S N Opening speech; (2) Bratman V L, Litvak A G, Suvorov E V (Institute of Applied Physics, RAS, Nizhny Novgorod) "Mastering the terahertz domain: sources and applications"; (3) Balykin V I (Institute of Spectroscopy, RAS, Troitsk, Moscow region) "Ultracold atoms and atom optics"; (4) Ledentsov N N (Ioffe Physical Technical Institute, RAS, St. Petersburg) "New-generation surface-emitting lasers as the key element of the computer communication era"; (5) Krasil'nik Z F (Institute for the Physics of Microstructures, RAS, Nizhny Novgorod) "Lasers for silicon optoelectronics"; (6) Shalagin A M (Institute of Automation and Electrometry, Siberian Branch, RAS, Novosibirsk) "High-power diode-pumped alkali metal vapor lasers"; (7) Kul'chin Yu N (Institute for Automation and Control Processes, Far Eastern Branch, RAS, Vladivostok) "Photonics of self-organizing biomineral nanostructures"; (8) Kolachevsky N N (Lebedev Physical Institute, RAS, Moscow) "Laser cooling of rare-earth atoms and precision measurements". The papers written on the basis of reports 2-4, 7, and 8 are published below.Because the paper based on report 6 was received by the Editors late, it will be published in the October issue of Physics-Uspekhi together with the material related to the Scientific Session of the Physical Sciences Division, RAS, of 22 December 2010. • Mastering the terahertz domain: sources and applications, V L Bratman, A G Litvak, E V Suvorov Physics-Uspekhi, 2011, Volume 54, Number 8, Pages 837-844 • Ultracold atoms and atomic optics, V I Balykin Physics

  4. Serum albumin binding sites properties in donors and in schizophrenia patients: the study of fluorescence decay of the probe K-35 using S-60 synchrotron pulse excitation

    NASA Astrophysics Data System (ADS)

    Gryzunov, Yu. A.; Syrejshchikova, T. I.; Komarova, M. N.; Misionzhnik, E. Yu; Uzbekov, M. G.; Molodetskich, A. V.; Dobretsov, G. E.; Yakimenko, M. N.

    2000-06-01

    The properties of serum albumin obtained from donors and from paranoid schizophrenia patients were studied with the fluorescent probe K-35 (N-carboxyphenylimide of dimethylaminonaphthalic acid) and time-resolved fluorescence spectroscopy on the SR beam station of the S-60 synchrotron of the Lebedev Physical Institute. The mean fluorescence quantum yield of K-35 in patients serum was decreased significantly by 25-60% comparing with donors. The analysis of pre-exponential factors of fluorescence decay using "amplitude standard" method has shown that in patient sera the fraction of K-35 molecules bound with albumin and inaccessible to fluorescence quenchers ("bright" K-35 molecules with τ1=8.0±0.4 ns) is 1.2-3 times less than in the donor sera. The fraction of K-35 molecules with partly quenched fluorescence ( τ2=1.44±0.22 ns) was significantly increased in schizophrenia patients. The results obtained suggest that the properties of binding region in serum albumin molecules of acute paranoid schizophrenia patients change significantly.

  5. Vorticity statistics of bounded two-dimensional turbulence

    NASA Astrophysics Data System (ADS)

    Clercx, H. J. H.; Molenaar, D.; van Heijst, Gertjan

    2004-11-01

    Vorticity statistics play an important role in the determination of small-scale dynamics in forced two-dimensional turbulence. On the basis of the Hölder-continuity of the vorticity field ω(t,x), the scaling behavior of vorticity structure functions S_p(ω(ℓ)), of order p, provides clues on small-scale intermittency. Confirming earlier ideas of Sulem and Frisch (JFM 72, 1975), Eyink (Phys. D 91, 1996) proved the following scaling of the second-order structure function S_2(ω(ℓ))≡<|ω(t,x+r)-ω(t,x)|^2> ˜ℓ^ζ_2, with ζ_2≤ 2/3 and ℓ≤ℓ_f. Here, ℓ=|r|, ℓf is the typical energy-injection scale, associated to an external forcing and the brackets <\\cdot> denote combined space- and time-averaging. The only assumption used to derive this scaling was a constant enstrophy flux to small scales, in the so-called enstrophy cascade range. On the contrary, using the classical Batchelor argument for the advection of a passive scalar, Falkovich and Lebedev (PRE 50, 1994) argued that one must have ζ_p=0 for all p. With new direct numerical simulations we address these issues for a bounded square domain, using the no-slip boundary condition for the velocity. Our results are compared with the earlier experimental results of Paret and Tabeling (PRL 83, 1999).

  6. Multimode Surface Wave Tomography Of Asia And Surroundings

    NASA Astrophysics Data System (ADS)

    Lebedev, S.; van der Hilst, R. D.

    We construct a large-scale, high-resolution, 3-D model of the upper mantle beneath Asia, Australia, and surrounding oceans. Automated Multimode Inversion of surface waves (Lebedev and Nolet, 2000) is used to extract the waveform phase information from the regional S and fundamental-mode wavetrains and relate it to structural per- turbations in the Earth. Efficient selection of the wavetrains uncontaminated by scat- tered waves ensures high accuracy of the measurements. Full automation allows us to constrain the tomographic model using a large waveform data set of about twenty thousand vertical-component seismograms and to achieve lateral resolution of 400- 700 km, varying with the local ray-path coverage. The tectonically diverse region of study encompasses units ranging from stable Archean cratons and the oldest ocean floor on Earth to currently opening backarc basins. The western half of the Pacific ``Ring of Fire" dominates the cross-sections down to 150 km depth. At greater depths, a pattern of prominent high-velocity anoma- lies is created by the deep roots of Precambrian continental units (Yangtze, India, Siberia, and Kazakhstan), oceanic lithosphere subducted in the Western Pacific, and the Indian lithosphere descending beneath Tibet. High-velocity continental roots are present beneath some Precambrian units but absent beneath others, depending on their tectonic history. Laterally, the roots can reach beyond the present extent of the overly- ing Archean-Proterozoic crust by as much as a few hundred kilometers.

  7. Deformation of compound shells under action of internal shock wave loading

    NASA Astrophysics Data System (ADS)

    Chernobryvko, Marina; Kruszka, Leopold; Avramov, Konstantin

    2015-09-01

    The compound shells under the action of internal shock wave loading are considered. The compound shell consists of a thin cylindrical shell and two thin parabolic shells at the edges. The boundary conditions in the shells joints satisfy the equality of displacements. The internal shock wave loading is modelled as the surplus pressure surface. This pressure is a function of the shell coordinates and time. The strain rate deformation of compound shell takes place in both the elastic and in plastic stages. In the elastic stage the equations of the structure motions are obtained by the assumed-modes method, which uses the kinetic and potential energies of the cylindrical and two parabolic shells. The dynamic behaviour of compound shells is treated. In local plastic zones the 3-D thermo-elastic-plastic model is used. The deformations are described by nonlinear model. The stress tensor elements are determined using dynamic deformation theory. The deformation properties of materials are influenced by the strain rate behaviour, the influence of temperature parameters, and the elastic-plastic properties of materials. The dynamic yield point of materials and Pisarenko-Lebedev's criterion of destruction are used. The modified adaptive finite differences method of numerical analysis is suggested for those simulations. The accuracy of the numerical simulation is verified on each temporal step of calculation and in the case of large deformation gradients.

  8. Near-Earth space hazards and their detection (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 27 March 2013)

    NASA Astrophysics Data System (ADS)

    2013-08-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS), titled "Near-Earth space hazards and their detection", was held on 27 March 2013 at the conference hall of the Lebedev Physical Institute, RAS. The agenda posted on the website of the Physical Sciences Division, RAS, http://www.gpad.ac.ru, included the following reports: (1) Emel'yanenko V V, Shustov B M (Institute of Astronomy, RAS, Moscow) "The Chelyabinsk event and the asteroid-comet hazard"; (2) Chugai N N (Institute of Astronomy, RAS, Moscow) "A physical model of the Chelyabinsk event"; (3) Lipunov V M (Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow) "MASTER global network of optical monitoring"; (4) Beskin G M (Special Astrophysical Observatory, RAS, Arkhyz, Karachai-Cirkassian Republic) "Wide-field optical monitoring systems with subsecond time resolution for the detection and study of cosmic threats". The expanded papers written on the base of oral reports 1 and 4 are given below. • The Chelyabinsk event and the asteroid-comet hazard, V V Emel'yanenko, B M Shustov Physics-Uspekhi, 2013, Volume 56, Number 8, Pages 833-836 • Wide-field subsecond temporal resolution optical monitoring systems for the detection and study of cosmic hazards, G M Beskin, S V Karpov, V L Plokhotnichenko, S F Bondar, A V Perkov, E A Ivanov, E V Katkova, V V Sasyuk, A Shearer Physics-Uspekhi, 2013, Volume 56, Number 8, Pages 836-842

  9. Determining source angular sizes from interplanetary-scintillation observations in the saturated regime

    NASA Astrophysics Data System (ADS)

    Glyantsev, A. V.; Tyul'bashev, S. A.; Chashei, I. V.; Shishov, V. I.

    2013-07-01

    Interplanetary-scintillation observations of the radio source B0531+194 (J0534+1927) obtained over a wide range of elongations at 111 MHz using the Big Scanning Antenna of the Lebedev Physical Institute are presented. Near the Sun, the temporal spectra of the scintillations have a two-component form, corresponding to the superposition of refractive and diffractive scintillations that is characteristic of the saturated regime. A method for estimating the angular size of the scintillating component based on measurement of the break frequency in the diffractive part of the scintillation spectrum is presented. The scintillating component as a fraction of the total flux can be determined using the maximum scintillation index. The angular size of the scintillating component in B0531+194 is found to be 0.24″ ± 0.05″, and the ratio of the fluxes in the core and halo to be roughly one-third. The flux density in the compact radio component is 5 Jy. The estimated parameters of the angular structure of the source are compared with observations at other frequencies.

  10. Study of Explosive Electron Emission from a Pin Cathode Using High Resolution Point-Projection X-Ray Radiography

    NASA Astrophysics Data System (ADS)

    Pikuz, S. A.; Shelkovenko, T. A.; Hammer, D. A.; Parkevich, E. V.; Tilikin, I. N.; Mingaleev, A. R.; Agafonov, A. V.

    2015-11-01

    Most studies of Explosive Electron Emission (EEE) are based on the idea of cathode flares developing after explosion of metal whiskers (micron scale pins) on the cathode surface. The physical state of the pin material, the spatial structure of the explosion and its origin are still a matter of conjecture. In this work we used high-resolution point projection x-ray radiography to observe micron scale pin explosion in a high-current diode. Pin cathodes made from 10-25 micron Cu or Mo wires were placed in gaps in return current circuits of hybrid X-pinches on the XP and BIN pulsers. Pin lengths were varied over a range 1-4 mm and pin-anode gaps within 0.05-3 mm. The diode current and voltage were measured. In experiments with small pin-anode gap (0.1 - 1 mm) development of an expanded dense core of the pin was observed except the pin tip with length 100-200 microns indicating significant energy deposition in the wire material. In experiments with bigger gaps there was no visible wire core expansion within the spatial resolution of the experimental technique. Work at Cornell was supported by the National Nuclear Security Administration Stewardship Sciences Academic Programs under Department of Energy Cooperative Agreement No. DE-NA0001836 and at the Lebedev Institute by the RSF grant 142200273.

  11. Results of IPS Observations in the Period Near Solar Activity Minimum

    NASA Astrophysics Data System (ADS)

    Chashei, I. V.; Shishov, V. I.; Tyul'bashev, S. A.; Subaev, I. A.; Oreshko, V. V.

    2013-07-01

    IPS observations with the Big Scanning Array of Lebedev Physical Institute (BSA LPI) radio telescope at the frequency 111 MHz have been monitored since 2006. All the sources, about several hundred daily, with a scintillating flux greater than 0.2 Jy are recorded for 24 hours in the 16 beams of the radio telescope covering a sky strip of 8∘ declination width. We present some results of IPS observations for the recent period of low solar activity considering a statistical ensemble of scintillating radio sources. The dependences of the averaged over ensemble scintillation index on heliocentric distance are considerably weaker than the dependence expected for a spherically symmetric geometry. The difference is especially pronounced in the year 2008 during the very deep solar activity minimum period. These features are explained by the influence of the heliospheric current sheet that is seen as a strong concentration of turbulent solar wind plasma aligned with the solar equatorial plane. A local maximum of the scintillation index is found in the anti-solar direction. Future prospects of IPS observations using BSA LPI are briefly discussed.

  12. Nonstandard Yukawa couplings and Higgs portal dark matter

    NASA Astrophysics Data System (ADS)

    Bishara, Fady; Brod, Joachim; Uttarayat, Patipan; Zupan, Jure

    2016-01-01

    We study the implications of non-standard Higgs Yukawa couplings to light quarks on Higgs-portal dark matter phenomenology. Saturating the present experimental bounds on up-quark, down-quark, or strange-quark Yukawa couplings, the predicted direct dark matter detection scattering rate can increase by up to four orders of magnitude. The effect on the dark matter annihilation cross-section, on the other hand, is subleading unless the dark matter is very light — a scenario that is already excluded by measurements of the Higgs invisible decay width. We investigate the expected size of corrections in multi-Higgs-doublet models with natural flavor conservation, the type-II two-Higgs-doublet model, the Giudice-Lebedev model of light quark masses, minimal flavor violation new physics models, Randall-Sundrum, and composite Higgs models. We find that an enhancement in the dark matter scattering rate of an order of magnitude is possible. Finally, we point out that a discovery of Higgs-portal dark matter could lead to interesting bounds on the light-quark Yukawa couplings.

  13. Stop layer: a flow braking mechanism in space and support from a lab experiment

    NASA Astrophysics Data System (ADS)

    Haerendel, G.; Suttle, L.; Lebedev, S. V.; Swadling, G. F.; Hare, J. D.; Burdiak, G. C.; Bland, S. N.; Chittenden, J. P.; Kalmoni, N.; Frank, A.; Smith, R. A.; Suzuki-Vidal, F.

    2016-06-01

    The paper presents short summaries and a synopsis of two completely independent discoveries of a fast flow braking process, one realized by a laboratory experiment (Lebedev et al 2014 Phys. Plasmas 21 056305), the other by theoretical reasoning stimulated by auroral observation (Haerendel 2015a J. Geophys. Res. Space Phys. 120 1697–714). The first has been described as a magnetically mediated sub-shock forming when a supersonic plasma flow meets a wall. The second tried to describe what happens when a high-beta plasma flow from the central magnetic tail meets the strong near-dipolar field of the magnetosphere. The term stop layer signals that flow momentum and energy are directly coupled to a magnetic perturbation field generated by a Hall current within a layer of the width of c/ω pi and immediately propagated out of the layer by kinetic Alfvén waves. As the laboratory situation is not completely collision-free, energy transfer from ions to electrons and subsequent radiative losses are likely to contribute. A synopsis of the two situations identifies and discusses six points of commonality between the two situations. It is pointed out that the stop layer mechanism can be regarded as a direct reversal of the reconnection process.

  14. A fast ellipsoid model for asteroids inverted from lightcurves

    NASA Astrophysics Data System (ADS)

    Lu, Xiao-Ping; Zhao, Hai-Bin; You, Zhong

    2013-04-01

    Research about asteroids has recently attracted more and more attention, especially focusing on their physical structures, such as their spin axis, rotation period and shape. The long distance between observers on Earth and asteroids makes it impossible to directly calculate the shape and other parameters of asteroids, with the exception of Near Earth Asteroids and others that have passed by some spacecrafts. Photometric measurements are still generally the main way to obtain research data on asteroids, i.e. the lightcurves recording the brightness and positions of asteroids. Supposing that the shape of the asteroid is a triaxial ellipsoid with a stable spin, a new method is presented in this article to reconstruct the shape models of asteroids from the lightcurves, together with other physical parameters. By applying a special curvature function, the method calculates the brightness integration on a unit sphere and Lebedev quadrature is employed for the discretization. Finally, the method searches for the optimal solution by the Levenberg-Marquardt algorithm to minimize the residual of the brightness. By adopting this method, not only can related physical parameters of asteroids be obtained at a reasonable accuracy, but also a simple shape model of an ellipsoid can be generated for reconstructing a more sophisticated shape model.

  15. Periodic boundary conditions for QM/MM calculations: Ewald summation for extended Gaussian basis sets

    NASA Astrophysics Data System (ADS)

    Holden, Zachary C.; Richard, Ryan M.; Herbert, John M.

    2013-12-01

    An implementation of Ewald summation for use in mixed quantum mechanics/molecular mechanics (QM/MM) calculations is presented, which builds upon previous work by others that was limited to semi-empirical electronic structure for the QM region. Unlike previous work, our implementation describes the wave function's periodic images using "ChElPG" atomic charges, which are determined by fitting to the QM electrostatic potential evaluated on a real-space grid. This implementation is stable even for large Gaussian basis sets with diffuse exponents, and is thus appropriate when the QM region is described by a correlated wave function. Derivatives of the ChElPG charges with respect to the QM density matrix are a potentially serious bottleneck in this approach, so we introduce a ChElPG algorithm based on atom-centered Lebedev grids. The ChElPG charges thus obtained exhibit good rotational invariance even for sparse grids, enabling significant cost savings. Detailed analysis of the optimal choice of user-selected Ewald parameters, as well as timing breakdowns, is presented.

  16. Data Processing Center of Radioastron Project: 3 years of operation.

    NASA Astrophysics Data System (ADS)

    Shatskaya, Marina

    ASC DATA PROCESSING CENTER (DPC) of Radioastron Project is a fail-safe complex centralized system of interconnected software/ hardware components along with organizational procedures. Tasks facing of the scientific data processing center are organization of service information exchange, collection of scientific data, storage of all of scientific data, data science oriented processing. DPC takes part in the informational exchange with two tracking stations in Pushchino (Russia) and Green Bank (USA), about 30 ground telescopes, ballistic center, tracking headquarters and session scheduling center. Enormous flows of information go to Astro Space Center. For the inquiring of enormous data volumes we develop specialized network infrastructure, Internet channels and storage. The computer complex has been designed at the Astro Space Center (ASC) of Lebedev Physical Institute and includes: - 800 TB on-line storage, - 2000 TB hard drive archive, - backup system on magnetic tapes (2000 TB); - 24 TB redundant storage at Pushchino Radio Astronomy Observatory; - Web and FTP servers, - DPC management and data transmission networks. The structure and functions of ASC Data Processing Center are fully adequate to the data processing requirements of the Radioastron Mission and has been successfully confirmed during Fringe Search, Early Science Program and first year of Key Science Program.

  17. Monitoring of space weather and radioactivity using small airborne platforms

    NASA Astrophysics Data System (ADS)

    Harrison, R. Giles; Lidgard, Jeffrey; Aplin, Karen L.; Nicoll, Keri A.

    2013-04-01

    Space Weather is increasingly considered as a hazard to society's technological systems, but the effects of energetic particles within the atmosphere - with a potential implication for climate - also present an area in which new scientific knowledge needs to be developed. Routine measurements of energetic particle fluxes made above the surface have been made by the Lebedev Institute, undertaking continuous balloon-carried measurements since 1957. An underexploited measurement opportunity is presented by the conventional weather balloons (radiosondes) launched regularly globally by meteorological services, which could potentially provide a cost-effective alternative to custom balloon flights, as well as the ability to make measurements of particle fluxes at a wide range of latitudes. This work describes the development of a small disposable ionisation sensor, exploiting the well-known response of inexpensive semiconductor devices (e.g. PIN photodiodes) to ionising radiation. Such a Photodiode Radiation Detector (PRD) is particularly suitable for balloon use, as, unlike previous Geiger tube detector systems, only low bias voltages are required, which simplifies the circuitry required, reduces power consumption and entirely removes any high voltage hazard. In addition to providing count rate information, basic energy spectrum information is in principle available from pulse amplitudes generated. We discuss the evaluation and deployment considerations for the use of a PRD on a standard radiosonde platform, to operate within and alongside the existing operational meteorological requirements.

  18. Petrology and Geochemistry of Quaternary Mafic Volcanism in the Northern of Lake Van, Eastern Anatolia Collision Zone, Turkey

    NASA Astrophysics Data System (ADS)

    Oyan, Vural; Keskin, Mehmet; Ünal, Esin; Sharkov, Evgenii V.

    2013-04-01

    Quaternary mafic lavas in the north of Lake Van erupted not only from eruption center like Girekol miniature shield volcano but also from N-S (Yüksektepe volcanic field) and E-W (Ormuktepe volcanic field) extending extensional fractures. Literature K/Ar dates (Lebedev et al., 2010) indicate that the basaltic and hawaiitic lavas erupted in a period between 1.08 and 0.36 Ma. These lavas are composed of olivine, plagioclase, augite and titanoaugite crystals and display porphyritic to aphyric textures. Major oxide, trace element and isotopic characteristics of the Quaternary lavas indicate that hawaiitic lavas are the fractionated derivates of a primitive alkali basaltic magma via fractional crystallization combined with assimilation process. Results of our AFC and EC-AFC models imply that alkali basaltic lavas assimilated negligible crustal material (~2%) in contrast to the hawaiitic lavas that experienced crustal contamination between 3% and 10%. LIL and LRE elements of the most primitive lavas display enrichments relative to HFS elements on N- MORB-normalized spidergrams while their lead isotopic ratios exhibit trends heading towards the EM2 type mantle, implying the importance of a distinct subduction component in the source. To evaluate partial melting processes in mantle source region of the Quaternary mafic volcanism, we conducted partial melting models. Results of our models suggest the presence of both garnet and spinel peridotite as the sources material with a partial melting degree ~5 % and mixing of the derivative melts from them in the genesis of the mafic alkaline lavas.

  19. FFAGs: Front-end for neutrino factories and medical accelerators

    NASA Astrophysics Data System (ADS)

    Mori, Yoshiharu

    The idea of Fixed Field Alternating Gradient (FFAG) accelerator was originated by different people and groups in the early 1950s. It was independently introduced by Ohkawa [Ohkawa (1953)], Symon et al. [Symon et al. (1956)], and Kolomensky [Kolomensky and Lebedev (1966)] when the strong Alternate Gradient (AG) focusing and the phase stability schemes were applied to particle acceleration. The first FFAG electron model was developed in the MURA accelerator project led by Kerst and Cole in the late 1950s. Since then, they have fabricated several electron models in the early 1960s [Symon et al. (1956)]. However, the studies did not lead to a single practical FFAG accelerator for the following 50 years. Because of the difficulties of treating non-linear magnetic field and RF acceleration for non-relativistic particles, the proton FFAG, especially, was not accomplished until recently. In 2000, the FFAG concept was revived with the world's first proton FFAG (POP) which was developed at KEK [Aiba (2000); Mori (1999)]. Since then, in many places [Berg (2004); Johnstone et al. (2004); Mori (2011); Ruggiero (2004); Trbojevic (2004)], FFAGs have been developed and constructed...

  20. 3D electromagnetic modelling of a TTI medium and TTI effects in inversion

    NASA Astrophysics Data System (ADS)

    Jaysaval, Piyoosh; Shantsev, Daniil; de la Kethulle de Ryhove, Sébastien

    2016-04-01

    We present a numerical algorithm for 3D electromagnetic (EM) forward modelling in conducting media with general electric anisotropy. The algorithm is based on the finite-difference discretization of frequency-domain Maxwell's equations on a Lebedev grid, in which all components of the electric field are collocated but half a spatial step staggered with respect to the magnetic field components, which also are collocated. This leads to a system of linear equations that is solved using a stabilized biconjugate gradient method with a multigrid preconditioner. We validate the accuracy of the numerical results for layered and 3D tilted transverse isotropic (TTI) earth models representing typical scenarios used in the marine controlled-source EM method. It is then demonstrated that not taking into account the full anisotropy of the conductivity tensor can lead to misleading inversion results. For simulation data corresponding to a 3D model with a TTI anticlinal structure, a standard vertical transverse isotropic inversion is not able to image a resistor, while for a 3D model with a TTI synclinal structure the inversion produces a false resistive anomaly. If inversion uses the proposed forward solver that can handle TTI anisotropy, it produces resistivity images consistent with the true models.

  1. Data processing in ``Radioastron'' mission. ASC Correlator.

    NASA Astrophysics Data System (ADS)

    Andrianov, Andrey

    The ``Radioastron'' space mission is the unique project of Russian Space Agency (Roscosmos) and Russian Academy of Sciences to investigate the Universe by means of implementation of VLBI principles with 'Spectr-R' space vehicle. The 10-m radiotelescop onboard ``Spectr-R'' is fully operational since 15 November, 2011 as the Space element of Ground-to-Space interferometer at the orbit with the apogee up to 350000 km. The correlator for Radioastron mission is a part of a ASL (Astro Space Locator) computer complex for Windows environment fully developed at Astro Space Center (ASC) of Lebedev Physical Institute. In the report the main features and operational procedures of the ASC correlator are described with the emphasis on the differences in data-processing from the ground VLBI. The description is given of the algorithm of time delay and its derivatives calculations that is a question of principle for a correlation procedure of the ground-space interferometer data. Methods of extracting of the correlation results are analyzed in terms of efficiency and parameterization of the correlator operations. Some scientific results of a number of observing sessions are given as illustrations.

  2. Analytical tools in accelerator physics

    SciTech Connect

    Litvinenko, V.N.

    2010-09-01

    This paper is a sub-set of my lectures presented in the Accelerator Physics course (USPAS, Santa Rosa, California, January 14-25, 2008). It is based on my notes I wrote during period from 1976 to 1979 in Novosibirsk. Only few copies (in Russian) were distributed to my colleagues in Novosibirsk Institute of Nuclear Physics. The goal of these notes is a complete description starting from the arbitrary reference orbit, explicit expressions for 4-potential and accelerator Hamiltonian and finishing with parameterization with action and angle variables. To a large degree follow logic developed in Theory of Cyclic Particle Accelerators by A.A.Kolmensky and A.N.Lebedev [Kolomensky], but going beyond the book in a number of directions. One of unusual feature is these notes use of matrix function and Sylvester formula for calculating matrices of arbitrary elements. Teaching the USPAS course motivated me to translate significant part of my notes into the English. I also included some introductory materials following Classical Theory of Fields by L.D. Landau and E.M. Liftsitz [Landau]. A large number of short notes covering various techniques are placed in the Appendices.

  3. Statistics of polymer extensions in turbulent channel flow.

    PubMed

    Bagheri, Faranggis; Mitra, Dhrubaditya; Perlekar, Prasad; Brandt, Luca

    2012-11-01

    We present direct numerical simulations of turbulent channel flow with passive Lagrangian polymers. To understand the polymer behavior we investigate the behavior of infinitesimal line elements and calculate the probability distribution function (PDF) of finite-time Lyapunov exponents and from them the corresponding Cramer's function for the channel flow. We study the statistics of polymer elongation for both the Oldroyd-B model (for Weissenberg number Wi<1) and the FENE model. We use the location of the minima of the Cramer's function to define the Weissenberg number precisely such that we observe coil-stretch transition at Wi ≈1. We find agreement with earlier analytical predictions for PDF of polymer extensions made by Balkovsky, Fouxon, and Lebedev [Phys. Rev. Lett. 84, 4765 (2000)] for linear polymers (Oldroyd-B model) with Wi <1 and by Chertkov [Phys. Rev. Lett. 84, 4761 (2000)] for nonlinear FENE-P model of polymers. For Wi >1 (FENE model) the polymer are significantly more stretched near the wall than at the center of the channel where the flow is closer to homogenous isotropic turbulence. Furthermore near the wall the polymers show a strong tendency to orient along the streamwise direction of the flow, but near the center line the statistics of orientation of the polymers is consistent with analogous results obtained recently in homogeneous and isotropic flows. PMID:23214883

  4. Statistics of polymer extensions in turbulent channel flow

    NASA Astrophysics Data System (ADS)

    Bagheri, Faranggis; Mitra, Dhrubaditya; Perlekar, Prasad; Brandt, Luca

    2012-11-01

    We present direct numerical simulations of turbulent channel flow with passive Lagrangian polymers. To understand the polymer behavior we investigate the behavior of infinitesimal line elements and calculate the probability distribution function (PDF) of finite-time Lyapunov exponents and from them the corresponding Cramer's function for the channel flow. We study the statistics of polymer elongation for both the Oldroyd-B model (for Weissenberg number Wi<1) and the FENE model. We use the location of the minima of the Cramer's function to define the Weissenberg number precisely such that we observe coil-stretch transition at Wi ≈1. We find agreement with earlier analytical predictions for PDF of polymer extensions made by Balkovsky, Fouxon, and Lebedev [Phys. Rev. Lett.PRLTAO0031-900710.1103/PhysRevLett.84.4765 84, 4765 (2000)] for linear polymers (Oldroyd-B model) with Wi <1 and by Chertkov [Phys. Rev. Lett.PRLTAO0031-900710.1103/PhysRevLett.84.4761 84, 4761 (2000)] for nonlinear FENE-P model of polymers. For Wi >1 (FENE model) the polymer are significantly more stretched near the wall than at the center of the channel where the flow is closer to homogenous isotropic turbulence. Furthermore near the wall the polymers show a strong tendency to orient along the streamwise direction of the flow, but near the center line the statistics of orientation of the polymers is consistent with analogous results obtained recently in homogeneous and isotropic flows.

  5. Free energy of dipolar hard spheres: The virial expansion under the presence of an external magnetic field

    NASA Astrophysics Data System (ADS)

    Elfimova, Ekaterina A.; Karavaeva, Tatyana E.; Ivanov, Alexey O.

    2014-12-01

    A method for calculation of the free energy of dipolar hard spheres under the presence of an applied magnetic field is presented. The method is based on the virial expansion in terms of density as well as the dipolar coupling constant λ, and it uses diagram technique. The formulas and the diagrams, needed to calculate the second B2 and third B3 virial coefficients, are derived up to the order of ˜λ3, and compared to the zero-field case. The formula for B2 is the same as in the zero-field case; the formula for B3, however, is different in an applied field, and a derivation is presented. This is a surprising result which is not emphasized in standard texts, but which has been noticed before in the virial expansion for flexible molecules (Caracciolo et al., 2006; Caracciolo et al., 2008). To verify the correctness of the obtained formulas, B2 and B3 were calculated within the accuracy of λ2, which were applied to initial magnetic susceptibility. The obtained expression fully coincides with the well-known theories (Morozov and Lebedev, 1990; Huke and Lücke, 2000; Ivanov and Kuznetsova, 2001), which used different methods to calculate the initial magnetic susceptibility.

  6. Commemoration of the centenary of the birth of Academician V V Migulin (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 28 September 2011)

    NASA Astrophysics Data System (ADS)

    2012-03-01

    The scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) commemorating the 100th anniversary of the birthday of Academician V V Migulin was held on September 28, 2011 at the conference hall of the P N Lebedev Physical Institute of the RAS. The following reports were put on the session agenda posted on the website www.gpad.ac.ru of the RAS Physical Sciences Division: (1) Gulyaev Yu V (V A Kotel'nikov Institute of Radioengineering and Electronics, RAS, Moscow) "Radiophysical methods in biomedical research"; (2) Vyatchanin S P (M V Lomonosov Moscow State University, Moscow) "Parametric oscillatory instability in laser gravitational antennas"; (3) Kuznetsov V D (N V Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, RAS, Troitsk, Moscow region) "Solar-terrestrial physics and its applications". The opening address and articles written on the base of the oral reports 2 and 3 are published below. • Opening address, Yu V Gulyaev Physics-Uspekhi, 2012, Volume 55, Number 3, Pages 301-302 • Parametric oscillatory instability in laser gravitational antennas, S P Vyatchanin Physics-Uspekhi, 2012, Volume 55, Number 3, Pages 302-305 • Solar-terrestrial physics and its applications, V D Kuznetsov Physics-Uspekhi, 2012, Volume 55, Number 3, Pages 305-314

  7. Physical properties of graphene (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 28 March 2012)

    NASA Astrophysics Data System (ADS)

    2012-11-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) devoted to the "Physical properties of graphene" was held on 28 March 2012 in the conference hall of the Lebedev Physical Institute. The agenda of the session announced on the RAS Physical Sciences Division website http://www.gpad.ac.ru included the following reports: (1) Falkovsky L A (Landau Institute of Theoretical Physics, RAS, Moscow; Vereshchagin Institute of High-Pressure Physics, RAS, Moscow) "Magnetooptics of graphene"; (2) Varlamov A A (The University of Rome Tor Vergata, Italy) "Thermoelectric properties of graphene." The papers written on the basis of these reports are given below. • Magnetooptics of graphene layers, L A Falkovsky Physics-Uspekhi, 2012, Volume 55, Number 11, Pages 1140-1145 • Anomalous thermoelectric and thermomagnetic properties of graphene, A A Varlamov, A V Kavokin, I A Luk'yanchuk, S G Sharapov Physics-Uspekhi, 2012, Volume 55, Number 11, Pages 1146-1151

  8. Spintronics and nanomagnetism (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 25 April 2012)

    NASA Astrophysics Data System (ADS)

    2012-12-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS), entitled "Spintronics and nanomagnetism", was held on 25 April 2012 at the conference hall of the Lebedev Physical Institute, RAS.The agenda of the session announced on the RAS Physical Sciences Division website www.gpad.ac.ru included the following reports: (1) Zvezdin A K, Zvezdin K A (Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow), Popkov A F (National Research University 'Moscow State Institute of Electronic Technology', Moscow) "Spin moment transfer effects and their applications in spintronics"; (2) Fraerman A A (Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhny Novgorod) "Magnetic states and transport properties of ferromagnetic nanostructures"; (3) Panin V E, Egorushkin V E, Panin A V (Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, Tomsk) "Nonlinear wave processes in a deformable solid as in a multiscale hierarchically organized system".Papers based on oral reports 2 and 3 are presented below. • Magnetic states and transport properties of ferromagnetic nanostructures, A A Fraerman Physics-Uspekhi, 2012, Volume 55, Number 12, Pages 1255-1260 • Nonlinear wave processes in a deformable solid as in a multiscale hierarchically organized system, V E Panin, V E Egorushkin, A V Panin Physics-Uspekhi, 2012, Volume 55, Number 12, Pages 1260-1267

  9. Demonstration of Flying Mirror with Improved Efficiency

    SciTech Connect

    Pirozhkov, Alexander S.; Kando, Masaki; Fukuda, Yuji; Chen Liming; Daito, Izuru; Ogura, Koichi; Homma, Takayuki; Hayashi, Yukio; Kotaki, Hideyuki; Sagisaka, Akito; Mori, Michiaki; Koga, James K.; Kawachi, Tetsuya; Kiriyama, Hiromitsu; Okada, Hajime; Kawase, Keigo; Kameshima, Takashi; Nishimori, Nobuyuki; Kimura, Toyoaki; Tajima, Toshiki

    2009-07-25

    A strongly nonlinear wake wave driven by an intense laser pulse can act as a partially reflecting relativistic mirror (the flying mirror)[S. V. Bulanov, et al., Bulletin of the Lebedev Physics Institute, No. 6, 9 (1991); S. V. Bulanov, et al., Phys. Rev. Lett. 91, 085001 (2003)]. Upon reflection from such mirror, a counter-propagating optical-frequency laser pulse is directly converted into high-frequency radiation, with a frequency multiplication factor approx4gamma{sup 2}(the double Doppler effect). We present the results of recent experiment in which the photon number in the reflected radiation was at least several thousand times larger than in our proof-of-principle experiment [M. Kando, et al., Phys. Rev. Lett. 99, 135001 (2007); A. S. Pirozhkov, et al., Phys. Plasmas 14, 123106 (2007)]. The flying mirror holds promise of generating intense coherent ultrashort XUV and x-ray pulses that inherit their temporal shape and polarization from the original optical-frequency (laser) pulses. Furthermore, the reflected radiation bears important information about the reflecting wake wave itself, which can be used for its diagnostics.

  10. The balloon system with stabilized platform and oriented submillimeter telescope: Design

    NASA Astrophysics Data System (ADS)

    Lapshin, V.; Leonov, V.; Levshuk, B.; Shekshnya, V.

    1994-02-01

    A large number of scientific ballooning programs in the interests both of fundamental sciences (astrophysics, solar physics, etc.) and applied research require fine spatial orientation in inertial space of scientific instruments installed on balloons. Among these, some of the actual programs are the investigations of astophysical objects in gamma- and X-ray, far-infrared/submillimeter regions, as are also high precision magnetometric measurements, the research of the Earth's atmosphere and related ecological problems. As an applied problem, the development of modern balloon-based communication systems is pointed out. A rather large amount of different balloon platforms is developed and used in modern practice of ballooning. The Academy of Sciences of Russia (ASR) provides the design of the balloon-borne oriented and stabilized platform from 1991 (Lebedev Physical Institute, ASR). We have designed and built the balloon platform, that is considered a universal device for future balloon research, where spatial orientation is required. At the first stage of this project, the design of the far-infared version of this platform was performed. The platform is equipped with an 1-meter Cassegrain type telescope (on scheme Nesmith). The primary mirror of spherical form (f/0.5) is made from special aluminum alloy: the construction of telescope is lightweight.

  11. The EUV-observatory TESIS on board Coronas-Photon: scientific goals and initial plan of observations

    NASA Astrophysics Data System (ADS)

    Bogachev, Sergey

    The TESIS a EUV-observatory for solar research from space will be launched in 2008 September on board the satellite Coronas-Photon from cosmodrome Plesetsk. TESIS is a project of Lebedev Physical Institute of Russian Academy of Science with contribution from Space Research Center of Polish Academy of Science (the spectrometer SphinX). The experiment will focus on quasi-monochromatic imaging of the Sun and XUV spectroscopy of solar plasma. The scientific payload of TESIS contains five instruments: (1) Bragg crystal spectroheliometer for Sun monochromatic imaging in the line MgXII 8.42 A, (2) the normal-incidence Herschelian EUV telescopes with a resolution of 1.7 arc sec operated in lines FeXXII 133 A, FeIX 171 A and HeII 304 A, (3) the EUV imaging spectrometer, (4) the wide-field Ritchey-Chretien coronograph and (5) the X-ray spectrometer SphinX. The TESIS will focus on coordinated study of solar activity from the transition region to the outer corona up to 4 solar radii in wide temperature range from 5*104 to 2*107 K. We describe the scientific goals of the TESIS and its initial plan of observations.

  12. Periodic boundary conditions for QM/MM calculations: Ewald summation for extended Gaussian basis sets

    SciTech Connect

    Holden, Zachary C.; Richard, Ryan M.; Herbert, John M.

    2013-12-28

    An implementation of Ewald summation for use in mixed quantum mechanics/molecular mechanics (QM/MM) calculations is presented, which builds upon previous work by others that was limited to semi-empirical electronic structure for the QM region. Unlike previous work, our implementation describes the wave function's periodic images using “ChElPG” atomic charges, which are determined by fitting to the QM electrostatic potential evaluated on a real-space grid. This implementation is stable even for large Gaussian basis sets with diffuse exponents, and is thus appropriate when the QM region is described by a correlated wave function. Derivatives of the ChElPG charges with respect to the QM density matrix are a potentially serious bottleneck in this approach, so we introduce a ChElPG algorithm based on atom-centered Lebedev grids. The ChElPG charges thus obtained exhibit good rotational invariance even for sparse grids, enabling significant cost savings. Detailed analysis of the optimal choice of user-selected Ewald parameters, as well as timing breakdowns, is presented.

  13. Numerical implementation of constitutive model for arterial layers with distributed collagen fibre orientations.

    PubMed

    Skacel, Pavel; Bursa, Jiri

    2015-01-01

    Several constitutive models have been proposed for the description of mechanical behaviour of soft tissues containing collagen fibres. Some of the commonly used approaches accounting for the dispersion of fibre orientations are based on the summation of (mechanical) contributions of differently oriented fibre families. This leads to the need of numerical integration on the sphere surface, and the related numerical consumption is the main disadvantage of this category of constitutive models. The paper is focused on the comparison of various numerical integration methods applied to a specific constitutive model applicable for arterial walls. Robustness and efficiency of several integration rules were tested with respect to application in finite element (FE) codes. Among all the analysed numerical integration rules, the best results were reached by Lebedev quadrature; the related parameters for the specific constitutive model are presented in the paper. The results were implemented into the commercial FE code ANSYS via user subroutines, and their applicability was demonstrated by an example of FE simulation with non-homogenous stress field. PMID:24168517

  14. CONFERENCES AND SYMPOSIA Spintronics(Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 3 February 2010)

    NASA Astrophysics Data System (ADS)

    2010-10-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) was held on 3 February 2010 at the Conference Hall of the P N Lebedev Physical Institute, RAS. The following reports were put on the session agenda posted on the website www.gpad.ac.ru of the Physical Sciences Division, RAS: (1) Ustinov V V (Institute of Metal Physics, Ural Branch, RAS, Ekaterinburg) "Metallic nanospintronics"; (2) Kusrayev Yu G (Ioffe Physical-Technical Institute, RAS, St. Petersburg) "Spin-related phenomena in semiconductors; physics and applications"; (3) Tarasenko S A (Ioffe Physical-Technical Institute, RAS, St. Petersburg) "Spin photocurrents in semiconductors"; (4) Averkiev N S, Golub L E (Ioffe Physical-Technical Institute, RAS, St. Petersburg) "Spin relaxation in quantum semiconductor heterostructures". Papers written on the basis of reports 2-4 are given below. • Spin phenomena in semiconductors: physics and applications, Yu G Kusrayev Physics-Uspekhi, 2010, Volume 53, Number 7, Pages 725-738 • Spin photocurrents in semiconductors, S A Tarasenko Physics-Uspekhi, 2010, Volume 53, Number 7, Pages 739-742 • Spin relaxation anisotropy in two-dimensional semiconductors, N S Averkiev Physics-Uspekhi, 2010, Volume 53, Number 7, Pages 742-745

  15. Photoluminescence from the Wigner Crystal.

    NASA Astrophysics Data System (ADS)

    Kodiyalam, S.; Fertig, H. A.; Das Sarma, S.

    1997-03-01

    We calculate within the harmonic approximation and first order time dependent perturbation theory the line shape of the photoluminescence spectrum corresponding to the recombination of an electron from a 2-d Wigner crystal with a hole bound to an acceptor atom. The recombination process is modeled as a sudden perturbation of the Hamiltonian for the x-y degrees of freedom of the electrons. Using the theoretical results of Dodonov and Manko, (Proc. Lebedev Phys. Inst., 183), 263 (1987) we are able to include in the perturbation, in addition to changes in the equilibrium positions of electrons, changes in the curvatures of the harmonically approximated potential. The computed line shapes are similar to that seen in a recent experiment by Kukushkin (I.V. Kukushkin, V.I. Falko, R.J. Haug, K. von Klitzing, K. Eberl and K. Totemayer, Phys. Rev. Lett. 72), 3594 (1994) et al - they have a faster rising as compared to the falling edge. However, for recombination processes beginning with the perfect Wigner lattice the spectral width is only ~ frac1 3 of that observed in experiment^3 whereas inclusion of disorder due to already recombined electrons results in the width being greater than in the experiment^3 by a factor of ~ 3. We speculate on the possible mechanisms that may lead to better agreement with experiment.

  16. Photoluminescence from the Wigner Crystal.

    NASA Astrophysics Data System (ADS)

    Kodiyalam, S.; Price, R.; Fertig, H. A.; Das Sarma, S.

    1996-03-01

    Motivated by recent experiments on radiative recombination of two-dimensional electrons in acceptor δ-doped GaAs/AlGaAs heterojunctions (I.V. Kukushkin, V.I. Falko, R.J. Haug, K. von Klitzing, K. Eberl and K. Totemayer, Phys. Rev. Lett. 72), 3594 (1994) as well as the success of a harmonic solid model (P. Johansson and J.M. Kinaret, Phys. Rev. Lett. 71), 1435 (1993) in describing tunneling between two-dimensional electron systems, we calculate within the harmonic approximation and sudden perturbation theory the photoluminescence spectrum from the recombination process. The potential for both the perturbed and unperturbed hamiltonians is computed using a recent algorithm for molecular dynamics which is expected to result in the classical ground state. (V.A. Schweigert and F.M. Peeters, Phys. Rev. B 51), 7700 (1995) Using the theoretical results of Dodonov and Manko (Proc. Lebedev Phys. Inst., 183), 263 (1987), we are able to include in the perturbation, in addition to changes in the equilibrium positions of electrons, changes in curvatures of the potential. Supported by NSF and the U.S. ONR

  17. Investigation of the white light coronal structure during the total solar eclipse on March 29, 2006

    NASA Astrophysics Data System (ADS)

    Stoeva, P.; Stoev, A.; Kuzin, S.; Shopov, Y.; Kiskinova, N.; Stoyanov, N.; Pertsov, A.

    2008-02-01

    Results from photographic observations of the white light solar corona conducted during the total phase of the total solar eclipse on March 29, 2006 in Manavgat, Turkey are shown in this work. Spectroscopic study of the green 530.3 nm line of Fe XIV in the corona of the Sun has also been made. The spectrograph was designed by specialists from the STIL-BAS "Acad. D. Mishev", Stara Zagora Department, Bulgaria; the Lebedev Physical Institute, Moscow, Russia; and the Yuri Gagarin Public Astronomical Observatory, Stara Zagora, Bulgaria. It has been found that the axis of symmetry of the "helmet"-type streamers is tilted towards the solar equator and the deviations from a radial direction in the western hemisphere are greater than those in the eastern one (21°/8°). The solar corona flattening is [epsilon]=0.098, which corresponds to an intermediate (before the minimum) type of corona. We have obtained that the solar cycle phase is [Phi]=0.17 for the 2006 TSE. White light corona is asymmetric, in contrast to solar corona observed during the August 11, 1999 total solar eclipse.

  18. Accelerated electrons and hard X-ray emission from X-pinches

    SciTech Connect

    Shelkovenko, T. A.; Pikuz, S. A.; Mingaleev, A. R.; Agafonov, A. V.; Romanova, V. M.; Ter-Oganes'yan, A. E.; Tkachenko, S. I.; Blesener, I. C.; Mitchell, M. D.; Chandler, K. M.; Kusse, B. R.; Hammer, D. A.

    2008-09-15

    The generation of accelerated electrons in the X-pinch minidiode is studied experimentally. It is well known that the explosion of an X-pinch consisting of two or more wires is accompanied by the formation of a minidiode, in which electrons are accelerated. The subsequent slowing down of electrons in the products of wire explosion causes the generation of hard X-ray (HXR) emission with photon energies higher than 10 keV. In this work, the spatial and temporal characteristics of X-pinch HXR emission are studied, the specific features of HXR generation are discussed, and the capability of applying this radiation to point-projection X-ray imaging of various plasma and biological objects is considered. The parameters of the electron beam produced in the X-pinch are measured using a Faraday cup and X-ray diagnostics. The experiments were performed with the XP generator (550 kA, 100 ns) at Cornell University (United States) and the BIN generator (270 kA, 150 ns) at the Lebedev Physical Institute (Russia).

  19. Low-temperature magnetic susceptibility of concentrated ferrofluids: The influence of polydispersity

    NASA Astrophysics Data System (ADS)

    Ivanov, Alexey O.; Elfimova, Ekaterina A.

    2015-01-01

    In this paper we address the question of theoretical explanation of extremely high low-temperature initial magnetic susceptibility of concentrated ferrofluids. These laboratory synthesized samples [A.F. Pshenichnikov, A.V. Lebedev, J. Chem. Phys. 121(11) (2004) 5455; Colloid J. 67(2) (2005) 189] demonstrated the record-breaking values χ ~ 120 - 150 at temperatures ~ 230-240 K. The existing models predict such high susceptibility only under the assumption of unreasonably large dipolar coupling constant, which is out of the range of applicability. Here we calculate the second virial contribution to susceptibility for polydisperse ferrofluid, modeled by the dipolar hard sphere fluid. In the resulting expression there exists the parameter, which plays a part of dipolar coupling constant and which is defined in a form of double averaging of high powers of particle sizes over the granulometric distribution. For real particle size distribution this effective parameter at least twice exceeds the commonly defined polydisperse dipolar coupling constant. We show that the low-temperature magnetic susceptibility of the record-breaking ferrofluids could be explained theoretically on the basis of the first terms of the polydisperse second virial contribution in combination with the second-order modified mean field model.

  20. Nonstandard Yukawa couplings and Higgs portal dark matter

    DOE PAGESBeta

    Bishara, Fady; Brod, Joachim; Uttayarat, Patipan; Zupan, Jure

    2016-01-04

    We study the implications of non-standard Higgs Yukawa couplings to light quarks on Higgs-portal dark matter phenomenology. Saturating the present experimental bounds on up-quark, down-quark, or strange-quark Yukawa couplings, the predicted direct dark matter detection scattering rate can increase by up to four orders of magnitude. The effect on the dark matter annihilation cross-section, on the other hand, is subleading unless the dark matter is very light — a scenario that is already excluded by measurements of the Higgs invisible decay width. We investigate the expected size of corrections in multi-Higgs-doublet models with natural flavor conservation, the type-II two-Higgs-doublet model,more » the Giudice-Lebedev model of light quark masses, minimal flavor violation new physics models, Randall-Sundrum, and composite Higgs models. We find that an enhancement in the dark matter scattering rate of an order of magnitude is possible. In conclusion, we point out that a discovery of Higgs-portal dark matter could lead to interesting bounds on the light-quark Yukawa couplings.« less

  1. Copper vapor laser prospects in glaucoma treatment

    NASA Astrophysics Data System (ADS)

    Egorov, E. A.; Nesterov, Arcady P.; Novoderezhkin, Vladimir I.; Egorov, Alexey E.; Shaban, Naim; Ponomarev, Igor V.

    1996-05-01

    New advances of copper vapor laser (CVL-laser) have been studied. Two wavelength radiation of the laser (511 nm and 578 nm) gives deeper permeability into organic tissues. Besides, the short pulse prevents the warm relaxation of small vessels. The technical data of CVL-laser: operating regime -- pulse, pulse duration -- 20 ns, pulse frequency 15000 pulse/sec. The shutter works in intervals from 0.05 to 2.0 sec. The power varies in accordance with wavelength: 511 nm (green) -- 1.5 W, 578 nm (yellow) -- 1, 2 W. The diameter of coagulate may be different: 100, 150, 400, 1000 mkm. We chose CVL-laser 'Femta,' created by P. N. Lebedev Physical Institute of RAS, for ophthalmological use. Thirty eight eyes of 37 patients with different types and stages of glaucoma were studied and treated with CVL-laser. The operations of photomydriasis, gonioplasty and trabeculoplasty have been performed. CVL- laser demonstrated efficient application in treatment of interior eye segment of glaucoma patients. The advantages and disadvantages of the CVL-laser application in glaucoma surgery were discussed.

  2. Equilibrium and highly nonequilibrium states of condensed matter (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 21 April 2008): Radiation-dynamic effects. Potential for producing condensed media with unique properties and structural states

    NASA Astrophysics Data System (ADS)

    Ovchinnikov, V. V.; Murtazaev, A. K.; Khazanov, E. A.; Sergeev, A. M.

    2008-09-01

    On 21 April 2008, a scientific session of the Physical Sciences Division of the Russian Academy of Sciences was held at the conference room of the Lebedev Physical Institute, RAS. The following talks were presented: (1) Ovchinnikov V V (Institute of Electrophysics, RAS (UB), Ekaterinburg) "Radiation-dynamic effects. Potential for producing condensed media with unique properties and structural states"; (2) Garnov S V (Prokhorov General Physics Institute, RAS, Moscow) "Femtosecond laser plasma of multiply ionized gases"; (3) Murtazaev A K (Institute of Physics, Dagestan Scientific Center, RAS, Dagestan State University, Makhachkala) "Critical properties of frustrated spin systems on a stacked triangular lattice"; (4) Khazanov E A and Sergeev A M (Institute of Applied Physics, RAS, Nizhnii Novgorod) "Petawatt lasers based on optical parametric amplifiers: their state and prospects". Summaries of talks 1, 3, and 4 are given below. • Radiation-dynamic effects. Potential for producing condensed media with unique properties and structural states, V V Ovchinnikov Physics-Uspekhi, 2008, Volume 51, Number 9, Pages 955-964 • Critical properties of frustrated spin systems on a stacked triangular lattice, A K Murtazaev Physics-Uspekhi, 2008, Volume 51, Number 9, Pages 965-969 • Petawatt lasers based on optical parametric amplifiers: their state and prospects, E A Khazanov and A M Sergeev Physics-Uspekhi, 2008, Volume 51, Number 9, Pages 969-974

  3. Heating of the quiet solar corona from measurements of the FET/TESIS instrument on-board the KORONAS-FOTON satellite

    NASA Astrophysics Data System (ADS)

    Rybák, J.; Gömöry, P.; Benz, A.; Bogachev, P.; Brajša, R.

    2010-12-01

    The paper presents the first results of the observations of time evolution of the quiet solar corona brightenings obtained due to very rapid photography of the corona with full-disk EUV telescopes of the FET/TESIS instrument onboard the KORONA FOTON satellite. The measurements were performed simultaneously in the emission of the Fe IX / X 17.1 and Fe VIII 13.1 spectral lines with 10 second temporal cadence and spatial scale of 1.7 arc seconds within one hour. This test observation, carried out on 15 July 2009, was analyzed in order to determine whether this type of observation can be used to identify individual microevents in the solar corona heating that are above the tresholds of spatial and temporal resolutions of the observations of non-active regions in the solar atmosphere. For this purpose, a simple method was used involving cross-correlation of the plasma emission time evolution at different temperatures, each time from observations of identical elements. The results obtained are confronted with the expected observable manifestations of the corona heating via nanoflares. TESIS is a set of instruments for the Sun photography developed in the Lebedev Physics Institute of the Russian Academy of Sciences that was launched into orbit in January 2009.

  4. A little something from physics for medicine (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 23 April 2014)

    NASA Astrophysics Data System (ADS)

    2014-12-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS), entitled "A little something from physics for medicine", was held on 23 April 2014 at the conference hall of the Lebedev Physical Institute, RAS. The agenda posted on the website of the Physical Sciences Division, RAS, http://www.gpad.ac.ru, included the following reports: (1) Rumyantsev S A (D Rogachev Federal Research and Clinical Center of Pediatric Hematology, Oncology, and Immunology, Moscow) "Translational medicine as a basis of progress in hematology/oncology"; (2) Akulinichev S V (Institute for Nuclear Research, RAS, Moscow) "Promising nuclear medicine research at the INR, RAS"; (3) Nikitin P P (Prokhorov General Physics Institute, RAS, Moscow) "Biosensorics: new possibilities provided by marker-free optical methods and magnetic nanoparticles for medical diagnostics"; (4) Alimpiev S S, Nikiforov S M, Grechnikov A A (Prokhorov General Physics Institute, RAS, Moscow) "New approaches in laser mass-spectrometry of organic objects". The publication of the article based on the oral report No. 2 is presented below. • Promising nuclear medicine research in the Institute for Nuclear Research, Russian Academy of Sciences, V V Akulinichev Physics-Uspekhi, 2014, Volume 57, Number 12, Pages 1239-1243

  5. Two-photon microscopy of oxygen: polymersomes as probe carrier vehicles.

    PubMed

    Sinks, Louise E; Robbins, Gregory P; Roussakis, Emmanuel; Troxler, Thomas; Hammer, Daniel A; Vinogradov, Sergei A

    2010-11-18

    Oxygen concentration distributions in biological systems can be imaged by the phosphorescence quenching method in combination with two-photon laser scanning microscopy. In this paper, we identified the excitation regime in which the signal of a two-photon-enhanced phosphorescent probe (Finikova, O. S.; Lebedev, A. Y.; Aprelev, A.; Troxler, T.; Gao, F.; Garnacho, C.; Muro, S.; Hochstrasser, R. M.; Vinogradov, S. A. ChemPhysChem 2008, 9, 1673-1679) is dependent quadratically on the excitation power (quadratic regime), and performed simulations that relate the photophysical properties of the probe to the imaging resolution. Further, we characterized polymersomes as a method of probe encapsulation and delivery. Photophysical and oxygen sensing properties of the probe were found unchanged when the probe is encapsulated in polymersomes. Polymersomes were found capable of sustaining high probe concentrations, thereby serving to improve the signal-to-noise ratios for oxygen detection compared to the previously employed probe delivery methods. Imaging of polymersomes loaded with the probe was used as a test-bed for a new method. PMID:20462225

  6. Astrophysics and astronomy (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 26 January 2011)

    NASA Astrophysics Data System (ADS)

    2011-10-01

    An Astrophysics and Astronomy scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) was held in the Conference Hall of the P N Lebedev Physical Institute, RAS, on 26 January 2011. The following reports were put on the session's agenda posted on the web site www.gpad.ac.ru of the Physical Sciences Division, RAS: (1) Cherepashchuk A M (Sternberg Astronomical Institute, Moscow State University, Moscow) "Investigation of X-ray sources"; (2) Shustov B M (Institute of Astronomy, Russian Academy of Sciences, Moscow) "Asteroid and comet hazards: physical and other aspects"; (3) Sazhin M V (Sternberg Astronomical Institute, Moscow State University, Moscow) "Search for cosmic strings"; (4) Zakharov A F (Russian Federation State Scientific Center 'A I Alikhanov Institute for Theoretical and Experimental Physics', Moscow) "Exoplanet search using gravitational microlensing". Papers written on the basis of the reports are published below. • Optical investigations of X-ray binary systems, A M Cherepashchuk Physics-Uspekhi, 2011, Volume 54, Number 10, Pages 1061-1067 • Asteroid and comet hazards: the role of physical sciences in solving the problem, B M Shustov Physics-Uspekhi, 2011, Volume 54, Number 10, Pages 1068-1071 • Search for cosmic strings using optical and radio astronomy methods, O S Sazhina, M V Sazhin, M Capaccioli, G Longo Physics-Uspekhi, 2011, Volume 54, Number 10, Pages 1072-1077 • Search for exoplanets using gravitational microlensing, A F Zakharov Physics-Uspekhi, 2011, Volume 54, Number 10, Pages 1077-1084

  7. What's new in magnetism (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 27 May 2015)

    NASA Astrophysics Data System (ADS)

    2015-10-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS), "What's new in magnetism?", was held in the conference hall of the Lebedev Physical Institute, RAS, on 27 May 2015.The papers collected in this issue were written based on talks given at the session: (1) Kalashnikova A M, Pisarev R V (Ioffe Physical-Technical Institute, RAS, St. Petersburg), Kimel A V (Radboud University Nijmegen, Institute for Molecules and Materials, The Netherlands; Moscow State Technical University of Radio Engineering, Electronics and Automation, Moscow) "Ultrafast optomagnetism"; (2) Pyatakov A P, Sergeev A S, Nikolaeva E P, Kosykh T B, Nikolaev A V (Lomonosov Moscow State University, Moscow), Zvezdin K A (Prokhorov General Physics Institute, RAS, Moscow; Kintech Laboratory Ltd, Moscow), Zvezdin A K (Prokhorov General Physics Institute, RAS, Moscow; Lebedev Physical Institute, RAS, Moscow) "Micromagnetism and topological defects in magnetoelectric media"; (3) Mukhin A A, Kuzmenko A M, Ivanov V Yu (Prokhorov General Physics Institute, RAS, Moscow), Pimenov A V, Shuvaev A M, Dziom V E (Institute of Solid State Physics, Vienna University of Technology, Vienna, Austria) "Dynamic magnetoelectric phenomena within electromagnons in rare-earth borate multiferroics"; (4) Nikitov S A (Kotel'nikov Institute of Radio Engineering and Electronics, RAS, Moscow; Moscow Institute of Physics and Technology (State University), Dolgoprudnyi, Moscow region; Chernyshevskii Saratov State University, Saratov), Kalyabin D V, Osokin S A (Kotel'nikov Institute of Radio Engineering and Electronics, RAS, Moscow; Moscow Institute of Physics and Technology (State University), Dolgoprudnyi, Moscow region), Lisenkov I V (Kotel'nikov Institute of Radio Engineering and Electronics, RAS, Moscow; Moscow Institute of Physics and Technology (State University), Dolgoprudnyi, Moscow region; Oakland University, Rochester, USA), Slavin A N (Oakland University, Rochester, USA), Barabanenkov

  8. The Greater India beneath Tibet: A detailed new seismic mapping

    NASA Astrophysics Data System (ADS)

    Lebedev, Sergei; Schaeffer, Andrew; Agius, Matthew

    2014-05-01

    properties of the Greater Indian lithosphere and in the mechanism of its descent beneath different parts of the plateau. In the west, cratonic Indian lithosphere underthrusts the Tibetan crust and collides with the Tarim Craton to the north of it. In the central part of the plateau, Indian lithosphere underthrusts Tibet form the Himalayas up to the Bangong-Nujiang Suture and then, further north, subducts at a relatively steep angle. Indian lithosphere now under the east-central Himalayas is not cratonic (not as thick and cold as in the west). Beneath eastern Tibet, the Indian lithosphere has subducted, at a shallow angle, hundreds of kilometers northwards to under the Qiangtang and Songpan-Ganzi Terranes. The detailed new seismic images provide new constraints on the size of the Greater India continent and on lateral variations in the properties of its lithosphere. The size and shape of the Greater India as evidenced by the seismic data are consistent with the recent plate-tectonic models in which the India-Asia hard continental collision commences more recently than previously thought. References Agius, M. R., S. Lebedev. Tibetan and Indian lithospheres in the upper mantle beneath Tibet: Evidence from broadband surface-wave dispersion. Geochem. Geophys. Geosyst. 14, doi:10.1002/ggge.20274, 2013. Schaeffer, A. J., S. Lebedev. Global shear-speed structure of the upper mantle and transition zone. Geophys. J. Int. 194, 417-449, 2013. Van Hinsbergen, D. J. J., et al., Greater India Basin hypothesis and a two-stage Cenozoic collision between India and Asia., Proc. Natl. Acad. Sci. USA 109, 7659-64, 2012. Zahirovic, S., et al., Insights on the kinematics of the India-Eurasia collision from global geodynamic models, Geochem. Geophys. Geosyst. 13, doi:10.1029/2011GC003883, 2012.

  9. Shear velocity and anisotropy distributions beneath southern Africa's cratons: Lithospheric structure, deformation, LAB and other discontinuities

    NASA Astrophysics Data System (ADS)

    Adam, Joanne; Lebedev, Sergei

    2013-04-01

    Seismic-velocity structure and anisotropy of cratonic lithosphere offer important clues on the enigmatic formation and stabilization of cratons. Broad-band surface waves are highly sensitive to both the isotropic-average shear speeds from the upper crust down to the asthenosphere (characterising the composition and thermal state of the lithosphere) and to radial and azimuthal shear-wave anisotropy (indicative of ancient and recent deformation and flow). Recently, receiver function studies have yielded exciting but puzzling new evidence, revealing multiple discontinuities at different depths within the lithosphere-asthenosphere depth range beneath cratons. While some of the receiver-function signals probably indicate the lithosphere-asthenosphere boundary (LAB), others must be due to sharp radial changes in the mantle-rock composition or anisotropy. We have recently used teleseismic interferometry to measure thousands of inter-station, Rayleigh- and Love-wave, phase-velocity curves across southern Africa (Adam and Lebedev 2012). Here, we invert the very-broadband dispersion data for the profiles of the shear speed and azimuthal and radial anisotropy beneath different parts of the Kaapvaal Craton and the Limpopo Belt. Systematic model space mapping is used to evaluate parameter trade-offs and to ensure the robustness of the anisotropy profiles. Our results, firstly, reconcile the long-debated previous models based on different interpretations of SKS-splitting measurements in southern Africa (one end-member model placing anisotropy primarily into the lithosphere and attributing it to Archean deformation and the other placing it into the asthenosphere, with recently developed fabric). We show that the depth distribution of anisotropy comprises elements of both models: anisotropy in the asthenosphere shows fast-propagation directions parallel to the plate motion; anisotropy in the Limpopo and northern Kaapvaal lithosphere shows fast directions parallel to the Archean

  10. Nepheline crystallization in boron-rich alumino-silicate glasses as investigated by multi-nuclear NMR, Raman, & Mössbauer spectroscopies

    SciTech Connect

    Mccloy, John S.; Washton, Nancy M.; Gassman, Paul L.; Marcial, Jose; Weaver, Jamie L.; Kukkadapu, Ravi K.

    2015-02-01

    A spectroscopic study was conducted on 6 complex simulant nuclear waste glasses using multi-nuclear NMR, Raman and Mössbauer spectroscopies to explore the role of glass-forming elements Si, Al, B, along with Na and Fe and to understand their connectivity with the goal of understanding melt structure precursors to deleterious feldspathoid nepheline-like crystals formation. NMR showed the appearance of two sites for Al, Si, and Na in the samples which crystallized significant amounts of nepheline, and B speciation changed, typically resulting in more B(IV) after nepheline crystallization. Raman spectroscopy suggested a major part of the glass structure is composed of metaborate chains or rings, thus significant numbers of non-bridging oxygens and a separation of the borate from the alumino-silicate network. Mössbauer combined with Fe redox chemical measurements showed that Fe plays a minor role in these glasses, mostly as Fe3+, but that iron oxide spinel forms with nepheline in all cases. Models of the glass network, speciation of B, and allocation of non-bridging oxygens were computed. The Yun-Dell-Bray model failed to predict the observed high concentration of NBO necessary to explain the metaborate features in the Raman spectra, and it largely over-estimated B(IV) fraction. The model assuming Na-Al-Si moieties and using experimental B(IV) fraction predicted a large amount of NBO consistent with Raman spectra. An alternative notation for appreciating the glass network is suggested and then used to investigate the changes the glass due to crystallization of sodium nepheline and the residual glass network. From a theoretical standpoint, it may be preferred to picture nuclear waste glasses by the Lebedev theory of glass structure where “microcrystallites” of ordered nuclei (or embryos) exist in the matrix of more disordered glass.

  11. Scientific session of the General meeting of the Physical Sciences Division of the Russian Academy of Sciences (7 December 2015)

    NASA Astrophysics Data System (ADS)

    2016-05-01

    A scientific session of the General meeting of the Physical Sciences Division of the Russian Academy of Sciences (RAS) was held in the conference hall of the Lebedev Physical Institute, RAS on 7 December 2015. The papers collected in this issue were written based on talks given at the session (the program of the session is available on the RAS Physical Sciences Division website http://www.gpad.ac.ru). (1) Loshchenov V B (Prokhorov General Physics Institute, RAS, Moscow) "Pharmacodynamics of a nanophotosensitizer under irradiation by an electromagnetic field: from THz to Cherenkov radiation"; (2) Zhuikov B L (Institute for Nuclear Research, RAS, Moscow) "Successes and problems in the development of medical radioisotope production in Russia"; (3) Tikhonov Yu A (Budker Institute of Nuclear Physics, SB RAS, Novosibirsk) "Applying nuclear physics methods in healthcare"; (4) Turchin I V (Institute of Applied Physics, RAS, Nizhny Novgorod) "Methods of biomedical optical imaging: from subcellular structures to tissues and organs"; (5) Breus T K, Petrukovich A A (Space Research Institute, RAS, Moscow), Binhi V N (Prokhorov General Physics Institute, RAS, Moscow; Lomonosov Moscow State University, Moscow) "Magnetic factor in solar-terrestrial relations and its impact on the human body: physical problems and prospects for research"; (6) Makarov D I (Special Astrophysical Observatory, RAS, Nizhnii Arkhyz, Zelenchukskii region, Karachai-Cherkessian Republic) "Studying the Local University". Papers based on oral reports 2, 4, and 5 are presented below. • Successes and problems in the development of medical radioisotope production in Russia, B L Zhuikov Physics-Uspekhi, 2016, Volume 59, Number 5, Pages 481–486 • Methods of biomedical optical imaging: from subcellular structures to tissues and organs, I V Turchin Physics-Uspekhi, 2016, Volume 59, Number 5, Pages 487–501 • Magnetic factor in solar-terrestrial relations and its impact on the human body: physical problems

  12. Scientific session of the General meeting of the Physical Sciences Division of the Russian Academy of Sciences (7 December 2015)

    NASA Astrophysics Data System (ADS)

    2016-05-01

    A scientific session of the General meeting of the Physical Sciences Division of the Russian Academy of Sciences (RAS) was held in the conference hall of the Lebedev Physical Institute, RAS on 7 December 2015. The papers collected in this issue were written based on talks given at the session (the program of the session is available on the RAS Physical Sciences Division website http://www.gpad.ac.ru). (1) Loshchenov V B (Prokhorov General Physics Institute, RAS, Moscow) "Pharmacodynamics of a nanophotosensitizer under irradiation by an electromagnetic field: from THz to Cherenkov radiation"; (2) Zhuikov B L (Institute for Nuclear Research, RAS, Moscow) "Successes and problems in the development of medical radioisotope production in Russia"; (3) Tikhonov Yu A (Budker Institute of Nuclear Physics, SB RAS, Novosibirsk) "Applying nuclear physics methods in healthcare"; (4) Turchin I V (Institute of Applied Physics, RAS, Nizhny Novgorod) "Methods of biomedical optical imaging: from subcellular structures to tissues and organs"; (5) Breus T K, Petrukovich A A (Space Research Institute, RAS, Moscow), Binhi V N (Prokhorov General Physics Institute, RAS, Moscow; Lomonosov Moscow State University, Moscow) "Magnetic factor in solar-terrestrial relations and its impact on the human body: physical problems and prospects for research"; (6) Makarov D I (Special Astrophysical Observatory, RAS, Nizhnii Arkhyz, Zelenchukskii region, Karachai-Cherkessian Republic) "Studying the Local University". Papers based on oral reports 2, 4, and 5 are presented below. • Successes and problems in the development of medical radioisotope production in Russia, B L Zhuikov Physics-Uspekhi, 2016, Volume 59, Number 5, Pages 481–486 • Methods of biomedical optical imaging: from subcellular structures to tissues and organs, I V Turchin Physics-Uspekhi, 2016, Volume 59, Number 5, Pages 487–501 • Magnetic factor in solar-terrestrial relations and its impact on the human body: physical problems

  13. X-pinch. Part I

    NASA Astrophysics Data System (ADS)

    Pikuz, S. A.; Shelkovenko, T. A.; Hammer, D. A.

    2015-04-01

    Results of experimental studies of the X-pinch since its invention and implementation in 1982 at the Lebedev Physical Institute are presented. The concept of the X-pinch arose in the course of innovative experiments on studying the generation of hot dense plasma in nanosecond Z-pinches. The main idea was to localize the region occupied by the plasma and stabilize the moment of its formation. This was achieved by using a load in the form of crossed wires. The resulting plasma object turned out to be so interesting that a new scientific direction appeared in plasma physics. At present, studies in this direction are being performed in many laboratories worldwide. The term X-pinch became conventional, and sections devoted to its study are always present at plasma conferences. X-pinch is not only a very interesting scientific object, but also a unique source of X-ray emission with extreme parameters. The use of X-pinches for point-projection X-ray radiography of high-energy-density objects provided many new experimental results. In some cases, the concepts of the processes occurring in matter upon fast energy deposition changed dramatically. The review consists of two parts. The first part briefly outlines the history of creation and studies of X-pinches, describes the diagnostic techniques and devices developed during these studies, and presents the main results obtained in studying the physical processes occurring in the X-pinch. The second part is devoted to the results of detailed studies of the X-pinch hot spot—the region where the highest plasma parameters are achieved and which is a source of X-ray emission with extreme parameters. Some results of X-pinch simulations are also presented.

  14. Sixth International Conference on Squeezed States and Uncertainty Relations

    NASA Technical Reports Server (NTRS)

    Han, D. (Editor); Kim, Y. S. (Editor); Solimento, S. (Editor)

    2000-01-01

    These proceedings contain contributions from about 200 participants to the 6th International Conference on Squeezed States and Uncertainty Relations (ICSSUR'99) held in Naples May 24-29, 1999, and organized jointly by the University of Naples "Federico II," the University of Maryland at College Park, and the Lebedev Institute, Moscow. This was the sixth of a series of very successful meetings started in 1990 at the College Park Campus of the University of Maryland. The other meetings in the series were held in Moscow (1992), Baltimore (1993), Taiyuan P.R.C. (1995) and Balatonfuered, Hungary (1997). The present one was held at the campus Monte Sant'Angelo of the University "Federico II" of Naples. The meeting sought to provide a forum for updating and reviewing a wide range of quantum optics disciplines, including device developments and applications, and related areas of quantum measurements and quantum noise. Over the years, the ICSSUR Conference evolved from a meeting on quantum measurement sector of quantum optics, to a wide range of quantum optics themes, including multifacet aspects of generation, measurement, and applications of nonclassical light (squeezed and Schrodinger cat radiation fields, etc.), and encompassing several related areas, ranging from quantum measurement to quantum noise. ICSSUR'99 brought together about 250 people active in the field of quantum optics, with special emphasis on nonclassical light sources and related areas. The Conference was organized in 8 Sections: Squeezed states and uncertainty relations; Harmonic oscillators and squeeze transformations; Methods of quantum interference and correlations; Quantum measurements; Generation and characterisation of non-classical light; Quantum noise; Quantum communication and information; and Quantum-like systems.

  15. Terahertz photometers to observe solar flares from space (SOLAR-T project)

    NASA Astrophysics Data System (ADS)

    Kaufmann, Pierre; Raulin, Jean-Pierre

    The space experiment SOLAR-T designed to observe solar flares at THz frequencies was completed. We present the concept, fabrication and performance of a double THz photometers system. An innovative optical setup allows observations of the full solar disk and the detection of small burst transients at the same time. It is the first detecting system conceived to observe solar flare THz emissions on board of stratospheric balloons. The system has been integrated to data acquisition and telemetry modules for this application. SOLAR-T uses two Golay cell detectors preceded by low-pass filters made of rough surface primary mirrors and membranes, 3 and 7 THz band-pass filters, and choppers. Its photometers can detect small solar bursts (tens of solar flux units) with sub second time resolution. One artificial Sun setup was developed to simulate actual observations. Tests comprised the whole system performance, on ambient and low pressure and temperature conditions. It is intended to provide data on the still unrevealed spectral shape of the mysterious THz solar flares emissions. The experiment is planned to be on board of two long-duration stratospheric balloon flights over Antarctica and Russia in 2014-2016. The SOLAR-T development, fabrication and tests has been accomplished by engineering and research teams from Mackenzie, Unicamp and Bernard Lyot Solar Observatory; Propertech Ltda.; Neuron Ltda.; and Samsung, Brazil; Tydex LCC, Russia; CONICET, Argentina; the stratospheric balloon missions will be carried in cooperation with teams from University of California, Berkeley, USA (flight over Antarctica), and Lebedev Physical Institute, Moscow, Russia (flight over Russia).

  16. The model of lithospheric thickness beneath China from gravity data

    NASA Astrophysics Data System (ADS)

    Zhang, H.; Ravat, D.

    2015-12-01

    We compare estimates of lithospheric thickness from several studies in China and examine whether the available gravity field anomalies can constrain these estimates. Ma (1987) suggested based on integrated geophysics that the lithospheric thickness varies from ~130 km in Qinling Dabie orogenic belt to ~60 km in Beijing, and ~50 km in Bohai bay. Lebedev and Nolet (2003) determined the lithospheric thickness in Bohai bay to be ~140 km from S wave tomography. Sodoudi et al.'s (2006) estimate of the lithospheric thickness is 72 km in Qinling Dabie orogenic belt and ~60 km in north China block. Since physical character differences exist between lithosphere and asthenosphere, it is possible to determine the thickness of lithospheric though gravity data. In this study, we use the crustal thickness obtained from teleseismic receiver functions (Li et al., 2014) to model the Moho gravity field variation and then remove this variation from the observed gravity field. Based on the residual field, the lithospheric thickness is obtained by the Parker inversion. Results show that the lithospheric thickness beneath China varies from ~80 km in the north of XinJiang to ~140 km in Tibet, and it changes to ~100 km in Eastern China. The residual field used for inversion is smooth which results in a smooth lithosphere-asthenosphere boundary (LAB). The LAB is generally in agreement with the previous seismic inversion result along profiles in eastern China (e.g. Li et al., 2011) and suggests that our method could be used to estimate the regional lithospheric variation in other areas in China, and somewhere else.

  17. Paleosecular Variation Study on a Pliocene Lava Flow Sequence in the Lesser Caucasus

    NASA Astrophysics Data System (ADS)

    Caccavari, A.; Calvo-Rathert, M.; Gogichaishvili, A.; Huaiyu, H.; Vashakidze, G.; Vegas, N.; Aguilar, B.

    2013-05-01

    A paleomagnetic and rock magnetic study was carried out on 39 successive Pliocene lava flows from the Saro sequence, which is located in the Djavakheti Highland in the Lesser Caucasus in Georgia. Previous K-Ar ages carried out by Lebedev et al. (Stratigraphy and Geological Correlation, 2008, Vol. 16, No.2, 204-224) yielded an age of 2.2 Ma for the sequence. For the present study a new Ar-Ar dating has been performed on samples from the lower and the upper part of the section. Rock magnetism experiments were carried out to characterize the carries of remanence and obtain information about their stability. Thermomagnetic experiments show that titanomagnetite with differing content of titan is the main carrier in the 39 lava flows. Analysis of hysteresis parameters suggests that the grain size of most studied samples corresponds to pseudo single-domain particles, which can also be interpreted in terms of a mixture of single-domain and multi-domain grains. Paleomagnetic experiments reveal in all flows only a single paleomagnetic component with reverse polarity, D= 205.6°, I= -60.7°, (α 95= 2.0, k= 129.6) and the calculated paleomagnetic pole yields a longitude λ= 123.1 and a latitude 71.1° (α 95=2.8°, k=72.1). The angular distance between the Pliocene paleomagnetic pole obtained in this work and the expected one is 17°. With the purpose of analysing the behaviour of paleosecular variation (PSV), the scatter of virtual geomagnetic poles was calculated and a value SB = 12.9, with an upper confidence limit Sup=14.28 and a lower confidence limit Slow= 10.45 was obtained. This result is lower than predicted by specific models for VGP dispersion at 41°N.

  18. Observations of airglow during injections of exhaust streams of ``Progress'' orbital maneuvering subsystem

    NASA Astrophysics Data System (ADS)

    Beletsky, Alexandr; Mikhalev, Alexander; Khakhinov, Vitaly; Lebedev, Valentin

    Observations of airglow during injections of exhaust streams of “Progress” orbital maneuvering subsystem A. Mikhalev, V. Khakhinov, A. Beletsky, V. Lebedev Institute of Solar-Terrestrial Physics of Siberian Branch of Russian Academy of Sciences (ISTP SB RAS) 664033, Lermontov str. 126a, p/o Box 291, Irkutsk, Russia ABSTRACT The effect of increasing the intensity of airglow emissions associated with spacecraft engines exhaust to the atmosphere is well-known. We carried out the "Radar-Progress" active space experiment for studying the ionosphere on April 17 2013. The exhaust products of orbital maneuvering subsystem engines of transport spacecraft “Progress” were used as a source of ionosphere disturbances. The engines run from 13:24:37 to 13:24:46 UT. The "Progress" orbit altitude was 412 km. We carried out observations of nightglow in the several spectral lines. The all-sky camera was used for obtaining spatial distribution of the 630 nm emission intensity. An increase in the emission intensity in the area of "Progress" track was observed after starting the engines. According to preliminary estimates, the rate of the glow expansion at the orbit altitude during first 60 seconds after the start was ~ 7 km/c along the orbit and ~ 3.5 km/s across the orbit. The observed glow area reached the largest size of ~ 350 km along the orbit and ~ 250 km across the orbit 120-150 s after start. The study has been supported by the grant 13-05-00456-a and 13-02-00957-a of the Russian Foundation for Basic Research and RF President Grant of Public Support for RF Leading Scientific Schools (NSh-2942.2014.5).

  19. Radio emission of RRAT-pulsars at a frequency of 111 MHz

    NASA Astrophysics Data System (ADS)

    Losovsky, Boris; Dmitry Dumsky, Mr/.

    We will report about our resalts concerning the observations of a number of Rotating Radio Transient (RRAT) pulsars .These observations have been carried out at Large Phased Array of P.N. Lebedev Physical Institute at 111 MHz during 2010-2013 years. RRAT- pulsars were first discovered in archive Parkes Multibeam Pulsar Survey [1,2]and Arecibo Pulsar Survey[3] at higher frequency 1400 MHz and some pulsars were discovered at frequency of 350 MHz with Green Bank Telescope[4]. A characteristic feature of these pulsars is sporadic radio emission in rare active phase and no radio emission for a long time making it difficult to find periodicity .Fast Folding Algorithm processing of observations at 111 MHz shows that even in passive phase RRAT-pulsars generate weak radio emission with the period corresponding to the period of sporadic radio pulses observed in the active phase. The flux density of the radio emission of these pulsars in passive phase is rather small even at low frequency 111 MHz, that greatly complicates its registration at high frequencies since flux density of the RRAT- pulsars decreases with increasing frequency.\\ ȩnterline{References}\\ 1.McLaughlin M.A., Lyne A.G., Lorimer D.R. et al., 2006, Nature,439,817. 2.Keane E.F., Ludovici D.A., Eatough E.P. et al., 2010, MNRAS,401,1057. 3.Deneva J.S., Cordes J.M., McLaughlin M.A. et al., 2009,ApJ,703,2259. 4.Keane E.F.,McLaughlin M.A., Bull.Astr.Soc.India, 2011,39,1.

  20. Detection of the structure near the 410 km and 660 km discontinuities in Japan subduction zone from the waveform triplication

    NASA Astrophysics Data System (ADS)

    Cui, H.; Zhou, Y.

    2015-12-01

    Slab subduction plays an important role in the mantle material circulation [Stern, 2002], and can also affect the feature of the 410 km and 660 km seismic discontinuities (410 and 660) [Lebedev et al., 2002]. Japan subduction zone is a natural laboratory for studying the mantle composition and velocity structure associated with the deep subduction of the Pacific plate. In this study, triplicated waveforms of an intermediate-depth earthquake at the Hokkaido of Japan (2011/10/21, 08:02:37.62, 142.5315°E, 43.8729°N, Mb6.0, relocated depth: 188 km) are retrieved from the dense Chinese Digital Seismic Network (CDSN). P and S waveforms are filtered with the band of 0.05-1.0 Hz and 0.02-0.5 Hz, respectively, and then integrated into the displacement data. The relative traveltime and synthetic waveform fitting is applied to mapping the deep structure. The best fitting models are obtained through the trial and error tests. We find a 15 km uplift of the 410 and a 25 km depression of the 660, indicating the cold environment caused by the subduction slab; both the 410 and 660 show the sharp discontinuity, but a smaller velocity contrast than the IASP91 model [Kennett and Engdahl, 1991]. Atop the 410 and 660, there are high-velocity layers associated with the subduction (or stagnant) slab. We also find a low-velocity anomaly with the thickness of ~65 km below the 660, which may relate to the slab dehydration or the hot upwelling at the top of the lower mantle. The seismic velocity ratio (VP/VS) shows a lower zone at the depth of ~210-395 km, showing the consistency with the low Poisson's ratio signature of the oceanic plate; a higher zone at the depth of ~560-685 km, implying the hydrous mantle transition zone.

  1. Physics at the Large Hadron Collider. Higgs boson (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 26 February 2014)

    NASA Astrophysics Data System (ADS)

    2014-09-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) "Physics at the Large Hadron Collider. Higgs boson" was held in the conference hall of the Lebedev Physical Institute, RAS, on 26 February 2014. The agenda of the session, announced on the website http://www.gpad.ac.ru of the Physical Sciences Division, RAS, listed the following reports: (1) Boos E E (Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow) "Standard Model and predictions for the Higgs boson"; (2) Zaytsev A M (National Research Center Kurchatov Institute, Moscow) "ATLAS experiment. The Higgs boson and the Standard Model"; (3) Lanyov A V (Joint Institute for Nuclear Research, Dubna, Moscow region) "CMS collaboration results: Higgs boson and search for new physics"; (4) Kazakov D I (Joint Institute for Nuclear Research, Dubna, Moscow region) "The Higgs boson has been found: what is next?" Papers written on the basis of oral reports 1, 3, and 4 are published below. An extensive review of the topic in item 2 will be published in an upcoming issue of Physics-Uspekhi. • Standard Model and predictions for the Higgs boson, E E Boos Physics-Uspekhi, 2014, Volume 57, Number 9, Pages 912-923 • CMS collaboration results: Higgs boson and search for new physics, A V Lanyov Physics-Uspekhi, 2014, Volume 57, Number 9, Pages 923-930 • The Higgs boson is found: what is next?, D I Kazakov Physics-Uspekhi, 2014, Volume 57, Number 9, Pages 930-942

  2. Accurate small and wide angle x-ray scattering profiles from atomic models of proteins and nucleic acids

    SciTech Connect

    Nguyen, Hung T.; Pabit, Suzette A.; Meisburger, Steve P.; Pollack, Lois; Case, David A.

    2014-12-14

    A new method is introduced to compute X-ray solution scattering profiles from atomic models of macromolecules. The three-dimensional version of the Reference Interaction Site Model (RISM) from liquid-state statistical mechanics is employed to compute the solvent distribution around the solute, including both water and ions. X-ray scattering profiles are computed from this distribution together with the solute geometry. We describe an efficient procedure for performing this calculation employing a Lebedev grid for the angular averaging. The intensity profiles (which involve no adjustable parameters) match experiment and molecular dynamics simulations up to wide angle for two proteins (lysozyme and myoglobin) in water, as well as the small-angle profiles for a dozen biomolecules taken from the BioIsis.net database. The RISM model is especially well-suited for studies of nucleic acids in salt solution. Use of fiber-diffraction models for the structure of duplex DNA in solution yields close agreement with the observed scattering profiles in both the small and wide angle scattering (SAXS and WAXS) regimes. In addition, computed profiles of anomalous SAXS signals (for Rb{sup +} and Sr{sup 2+}) emphasize the ionic contribution to scattering and are in reasonable agreement with experiment. In cases where an absolute calibration of the experimental data at q = 0 is available, one can extract a count of the excess number of waters and ions; computed values depend on the closure that is assumed in the solution of the Ornstein–Zernike equations, with results from the Kovalenko–Hirata closure being closest to experiment for the cases studied here.

  3. X-pinch. Part I

    SciTech Connect

    Pikuz, S. A. Shelkovenko, T. A.; Hammer, D. A.

    2015-04-15

    Results of experimental studies of the X-pinch since its invention and implementation in 1982 at the Lebedev Physical Institute are presented. The concept of the X-pinch arose in the course of innovative experiments on studying the generation of hot dense plasma in nanosecond Z-pinches. The main idea was to localize the region occupied by the plasma and stabilize the moment of its formation. This was achieved by using a load in the form of crossed wires. The resulting plasma object turned out to be so interesting that a new scientific direction appeared in plasma physics. At present, studies in this direction are being performed in many laboratories worldwide. The term X-pinch became conventional, and sections devoted to its study are always present at plasma conferences. X-pinch is not only a very interesting scientific object, but also a unique source of X-ray emission with extreme parameters. The use of X-pinches for point-projection X-ray radiography of high-energy-density objects provided many new experimental results. In some cases, the concepts of the processes occurring in matter upon fast energy deposition changed dramatically. The review consists of two parts. The first part briefly outlines the history of creation and studies of X-pinches, describes the diagnostic techniques and devices developed during these studies, and presents the main results obtained in studying the physical processes occurring in the X-pinch. The second part is devoted to the results of detailed studies of the X-pinch hot spot—the region where the highest plasma parameters are achieved and which is a source of X-ray emission with extreme parameters. Some results of X-pinch simulations are also presented.

  4. Velior Petrovich

    NASA Astrophysics Data System (ADS)

    Ness, Norman

    Dr. Velior Petrovich Shabansky, aged 58, the head of the Laboratory of Cosmic Electrodynamics, Institute of Nuclear Physics, Moscow State University, suddenly passed away on November 16, 1985, of a heart attack. He was one of the founders of theoretical ideas in physics of interplanetary and near-earth space. Shabansky obtained his education at the Moscow State University and joined the P. N. Lebedev Physical Institute, Academy of Sciences of the U.S.S.R., as a postgraduate. He obtained his Candidate's Degree in theory of conductivity of metals in strong electric fields, with V. L. Ginsburg as his advisor, in 1954. During 1954-1958, Shabansky continued investigation of nonlinear properties of plasma in metals. For the next 2 years, he worked at the Crimean Astrophysical Observatory. Shabansky left the Crimean Observatory to go to the Institute of Nuclear Physics, Moscow State University, where he investigated the earth's radiation belts, the plasma of the earth's magnetosphere, finished his doctoral dissertation, and received his degree in 1966. From 1966, he headed the Laboratory of Cosmic Electrodynamics, Institute of Nuclear Physics, Moscow State University. He is best known to the scientific community in the Soviet Union as chief of the Seminar on Cosmic Electrodynamics. Shabansky elaborated a special course of lectures on space physics that has been delivered for many years at the Physical Faculty, Moscow State University. He taught a large number of Soviet physicists, experts in cosmic electrodynamics. An enthusiastic, talented, and many-sided personality, he carried away everybody who knew him. He was known to the U.S. space physics community because of his own work, because of the work of his colleagues and students, a n d because of his infectious and spirited personality. Having died an untimely death, he left a deeply mourning widow and a 23-year-old son. Friends and colleagues will keep the bright image of Dr. Shabansky in their memory forever.

  5. OH maser observations using the Russian interferometric network ``Quasar'' in preparation for scientific observations with the space mission RadioAstron.

    NASA Astrophysics Data System (ADS)

    Litovchenko, I. D.; Alakoz, A. V.; Kostenko, V. I.; Lihachev, S. F.; Finkelstein, A. M.; Ipatov, A. V.

    2012-07-01

    We present results of a VLBI experiment at a wavelength of 18 cm, which simulates the ground-space interferometer with space link to RadioAstron. An array of five antennas was used, four of them are located in the Russian Federation, plus the the 32-m radio telescope in Medicine (Italy). The 22-m radio telescope in Pushchino (Moscow Region) acted in place of the space arm. It has an effective area of 100 square meters. The three other Russian 32-m antennas are operated by the Institute of Applied Astronomy RAS; they are located at Badary, Svetloe and Zelenchukskaya (interferometer network ``Quasar''). The maximum base-line, Badary-Svetloe, was about 4402 km, providing an angular resolution of about 0.009 arc seconds at a wavelength of 18 cm. The duration of the experiment was 10 hours on 02/03 February 2011. The program of observations included quasars 3C273, 3C279, 3C286 and the maser source - W3(OH). W3(OH) was observed only by the Russian telescopes and was investigated at the frequency of the 1665 MHz main line. The data were recorded on the MK5 recorder (32-m radio telescopes) and the RDR system (RadioAstron Digital Recorder) in Pushchino. The low SEFD (system equivalence of flux density) of Pushchino emulated the RadioAstron antenna. Correlation was performed with the universal software correlator of the AstroSpace Center of Lebedev Physical Institute. The correlator output format is compatible with that used by the AIPS package, which was used for data analysis. After analyzing the correlated data we obtained relative coordinates of the maser components. The main results are tabulated and presented in the figures. The data quality is sufficient for astrophysical analysis and comparison with previous observations of maser source W3(OH) on VLBI networks EVN and VLBA.

  6. Anisotropic Seismic Structure Beneath Cratons From Interstation Surface-Wave Dispersion Measurements on GSN and Geofon Data

    NASA Astrophysics Data System (ADS)

    Boonen, J.; Lebedev, S.

    2005-12-01

    Seismic structure of stable continental lithosphere offers insight into the origin and evolution of the tectosphere. The structure is still poorly known, especially its anisotropic components. Measurements of interstation dispersion of Rayleigh and Love surface waves can produce accurate, radially anisotropic S-velocity profiles that average between pairs of stations. A recently proposed (Lebedev and Meier, 2005) combination of station-station cross-correlation and event-station multimode waveform inversion allows to maximize the frequency band of the measured dispersion curves and yields improved structural constraints. With a view to applying the new method to large global data sets, here we make the measurements using all pairs of GSN and Geofon stations that are situated on stable continents and separated by sufficiently short interstation distances. If the distance between the two stations exceeds about 1000 km then it is difficult to make measurements at shorter periods---below 20 s or so---and trade-offs between the crustal and mantle structure cannot be resolved: in particular, nothing can be concluded on the nature or even the presence of radial anisotropy in the mantle. Limiting the scope of the study to station pairs separated by a few hundred kilometers, we make dispersion measurements using all suitably situated events and select a few pairs---all within stable tectonic blocks in Eurasia---for which broad-band dispersion curves are constrained with large amounts of data. Inverting the curves for S-velocity profiles, we find that the magnitudes of both the isotropic high-velocity anomaly and radial anisotropy in the mantle lithosphere vary strongly from one location to another. When radial anisotropy is present, it is with SH waves being faster than SV waves. We shall discuss the anisotropic seismic structures in the context of regional tectonic settings.

  7. From the history of physics (Scientific session of the General Meeting of the Physical Sciences Division of the Russian Academy of Sciences, 17 December 2012)

    NASA Astrophysics Data System (ADS)

    2013-05-01

    A scientific session of the General Meeting of the Physical Sciences Division of the Russian Academy of Sciences (RAS) was held in the conference hall of the Lebedev Physical Institute, RAS on 17 December 2012.The following reports were put on the session's agenda posted on the website http://www.gpad.ac.ru of the RAS Physical Sciences Division: (1) Dianov E M (Fiber Optics Research Center, RAS, Moscow) "On the threshold of a peta era"; (2) Zabrodskii A G (Ioffe Physical Technical Institute, RAS, St. Petersburg) "Scientists' contribution to the great victory in WWII using the example of the Leningrad (now A F Ioffe) Physical Technical Institute"; (3) Ilkaev R I (Russian Federal Nuclear Center --- All-Russian Research Institute of Experimental Physics, Sarov) "Major stages of the Soviet Atomic Project"; (4) Cherepashchuk A M (Sternberg State Astronomical Institute of Lomonosov Moscow State University, Moscow) "History of the Astronomy history ". Papers written on the basis of the reports are published below. • On the Threshold of Peta-era, E M Dianov Physics-Uspekhi, 2013, Volume 56, Number 5, Pages 486-492 • Scientists' contribution to the Great Victory in WWII on the example of the Leningrad (now A F Ioffe) Physical Technical Institute, A G Zabrodskii Physics-Uspekhi, 2013, Volume 56, Number 5, Pages 493-502 • Major stages of the Atomic Project, R I Ilkaev Physics-Uspekhi, 2013, Volume 56, Number 5, Pages 502-509 • History of the Universe History, A M Cherepashchuk Physics-Uspekhi, 2013, Volume 56, Number 5, Pages 509-530

  8. The First Extrasolar Planet Discovered with A New Generation High Throughput Doppler Instrument

    NASA Astrophysics Data System (ADS)

    Ge, J.; van Eyken, J.; Mahadevan, S.; DeWitt, C.; Cohen, R.; Vanden Heuvel, A.; Fleming, S.; Guo, P.; Kane, S.; Henry, G.; Israelian, G.; Martin, E.

    2005-12-01

    We report the first extrasolar planet, ET1, detected with a new generation Doppler instrument, called Exoplanet Tracker. This planet has a minimum mass of 0.41 Jupiter masses and orbits a V = 8.1 K0V star with a 4.8 day period. The planet was identified using the KPNO Coude Feed 0.9 meter telescope in spring 2005. This is the first time an extrasolar planet around a star fainter than V=8 magnitude has been discovered with an under 1 meter size astronomical telescope and Doppler instrument. This planet discovery is possible due to the extremely high throughput of the instrument, nearly 50% measured from the fiber output end to the detector. This discovery enables a new generation radial-velocity survey that could detect thousands of exoplanets using multiple-object versions of the ET instruments, called the W.M. Keck Exoplanet Tracker, at large wide-field telescopes in 2006-2020. A prototype multiple object ET has already demonstrated a 25 object capability for precision Doppler measurements at the Sloan telescope in early 2005. The ET instrument design is based on dispersed fixed-delay interferometry (Ge 2002), which is evolved from the earlier externally dispersed interferometry (Erskine and Ge 2000; Ge, Erskine and Rushford 2002) and the Global Oscillation Net Work (GONG) interferometry (Barker & Hollenbach 1972; Gorskii & Lebedev 1977; Beckers & Brown 1978; Harvey et al., 1988; Harvey 2002 private communications). We acknowledge the excellent support from the KPNO and Sloan management, technical and observational staff. The ET project is supported by the University of Florida, NSF, Keck Foundation and NASA JPL (Michelson Fellowship Program).

  9. Accurate small and wide angle x-ray scattering profiles from atomic models of proteins and nucleic acids

    NASA Astrophysics Data System (ADS)

    Nguyen, Hung T.; Pabit, Suzette A.; Meisburger, Steve P.; Pollack, Lois; Case, David A.

    2014-12-01

    A new method is introduced to compute X-ray solution scattering profiles from atomic models of macromolecules. The three-dimensional version of the Reference Interaction Site Model (RISM) from liquid-state statistical mechanics is employed to compute the solvent distribution around the solute, including both water and ions. X-ray scattering profiles are computed from this distribution together with the solute geometry. We describe an efficient procedure for performing this calculation employing a Lebedev grid for the angular averaging. The intensity profiles (which involve no adjustable parameters) match experiment and molecular dynamics simulations up to wide angle for two proteins (lysozyme and myoglobin) in water, as well as the small-angle profiles for a dozen biomolecules taken from the BioIsis.net database. The RISM model is especially well-suited for studies of nucleic acids in salt solution. Use of fiber-diffraction models for the structure of duplex DNA in solution yields close agreement with the observed scattering profiles in both the small and wide angle scattering (SAXS and WAXS) regimes. In addition, computed profiles of anomalous SAXS signals (for Rb+ and Sr2+) emphasize the ionic contribution to scattering and are in reasonable agreement with experiment. In cases where an absolute calibration of the experimental data at q = 0 is available, one can extract a count of the excess number of waters and ions; computed values depend on the closure that is assumed in the solution of the Ornstein-Zernike equations, with results from the Kovalenko-Hirata closure being closest to experiment for the cases studied here.

  10. A concept of high plasma compression by the ponderomotive force of an annularly focused laser beam

    NASA Astrophysics Data System (ADS)

    Sarkisov, G. S.; Bychenkov, V. Yu.; Tikhonchuk, V. T.

    1998-11-01

    We propose a new concept of kinetic plasma compression by the ponderomotive force of a multi-terawatt annularly focused laser beam. The idea is based on the Coulomb explosion phenomenon, predicted in [1] and observed recently in experiment [2]. In this experiment the focused 1.5 J, 400 fs laser pulse creates in a He gas target a large number of ions with energy up to 500 keV propagating radially from the laser axis. The ions were accelerated by a strong electric field produced by the ponderomotively driven charge separation in a laser channel. We suggest now to employ an annular laser focusing and accelerate a part of ions radially towards the center. Using an appropriate laser pulse shape and target one can achieve a significant kinetic compression on the axis and initiate secondary processes which might be useful for applications. A simple kinetic PIC code has been used for calculations of the characteristic parameters of compression. Preliminary results suggest that by accelerating ions to the energy of 100 keV one can achieve a 100 times volume compression in a 1 micron core during the time of 10 - 20 ps. Even higher, more then 1000 times volume compression can be achieved in a short time scale of 1 ps. These kinetically compressed high-energy ions can be used for initialization of DT fusion reaction, X-ray laser pumping, and for the production of multicharged ions. Such a ponderomotive plasma compression can be performed with modern femtosecond multi-terawatt laser systems. Research has been supported in part by the Russian Foundation for Basic Research, grant No. 96-02-16707- a. [1] N. H. Burnett and G. D. Enright, IEEE J. Quantum Electron., 26, 1797 (1990). [2] G. S. Sarkisov et all., JETP Lett., 66, 1787 (1997). Permanent address of all author: P.N.Lebedev Physics Institute, Moscow, 117924, Russia

  11. Laboratory Studies of Magnetically Driven, Radiatively Cooled Supersonic Plasma Jets

    NASA Astrophysics Data System (ADS)

    Lebedev, Sergey V.

    2010-05-01

    Results of the recent experiments with radiatively cooled jets performed on the pulsed power MAGPIE facility (1.5MA, 250ns) at Imperial College will be presented. The experiments are scalable to astrophysical flows in that critical dimensionless numbers such as the plasma collisionality, the plasma beta, Reynolds number and the magnetic Reynolds number are all in the astrophysically appropriate ranges. The experimental results will be compared with computer simulations performed with laboratory plasma codes and with astrophysical codes. The main part of the presentation will concentrate on the dynamics of magnetically driven jets, in particular on formation of episodic outflows [1]. The experimental results show the periodic ejections of magnetic bubbles naturally evolving into a heterogeneous jet propagating inside a channel made of self-collimated magnetic cavities. Experimental data on the energy balance in the magnetically driven jets, the conversion of the Poynting flux energy into kinetic energy of the outflow, will be also presented. *) In collaboration with A. CIARDI, F.A. SUZUKI-VIDAL, S.N. BLAND, M. BOCCHI, G. BURDIAK, J.P. CHITTENDEN, P. de GROUCHY, G. HALL, A. HARVEY-THOMSON, A. MAROCCHINO, G. SWADLING, A. FRANK, E. G. BLACKMAN, C. STEHLE, M. CAMENZIND. This research was sponsored by EPSRC, by the OFES DOE, by the NNSA under DOE Cooperative Agreement No. DE-FC03-02NA00057 and by the European Community's Marie Curie Actions within the JETSET network under Contract No. MRTNCT- 2004 005592. References [1] A. Ciardi, S.V. Lebedev, A. Frank et al., The Astrophysical Journal, 691: L147-L150 (2009).

  12. Discrete variable representation in electronic structure theory: quadrature grids for least-squares tensor hypercontraction.

    PubMed

    Parrish, Robert M; Hohenstein, Edward G; Martínez, Todd J; Sherrill, C David

    2013-05-21

    We investigate the application of molecular quadratures obtained from either standard Becke-type grids or discrete variable representation (DVR) techniques to the recently developed least-squares tensor hypercontraction (LS-THC) representation of the electron repulsion integral (ERI) tensor. LS-THC uses least-squares fitting to renormalize a two-sided pseudospectral decomposition of the ERI, over a physical-space quadrature grid. While this procedure is technically applicable with any choice of grid, the best efficiency is obtained when the quadrature is tuned to accurately reproduce the overlap metric for quadratic products of the primary orbital basis. Properly selected Becke DFT grids can roughly attain this property. Additionally, we provide algorithms for adopting the DVR techniques of the dynamics community to produce two different classes of grids which approximately attain this property. The simplest algorithm is radial discrete variable representation (R-DVR), which diagonalizes the finite auxiliary-basis representation of the radial coordinate for each atom, and then combines Lebedev-Laikov spherical quadratures and Becke atomic partitioning to produce the full molecular quadrature grid. The other algorithm is full discrete variable representation (F-DVR), which uses approximate simultaneous diagonalization of the finite auxiliary-basis representation of the full position operator to produce non-direct-product quadrature grids. The qualitative features of all three grid classes are discussed, and then the relative efficiencies of these grids are compared in the context of LS-THC-DF-MP2. Coarse Becke grids are found to give essentially the same accuracy and efficiency as R-DVR grids; however, the latter are built from explicit knowledge of the basis set and may guide future development of atom-centered grids. F-DVR is found to provide reasonable accuracy with markedly fewer points than either Becke or R-DVR schemes. PMID:23697409

  13. Discrete variable representation in electronic structure theory: Quadrature grids for least-squares tensor hypercontraction

    NASA Astrophysics Data System (ADS)

    Parrish, Robert M.; Hohenstein, Edward G.; Martínez, Todd J.; Sherrill, C. David

    2013-05-01

    We investigate the application of molecular quadratures obtained from either standard Becke-type grids or discrete variable representation (DVR) techniques to the recently developed least-squares tensor hypercontraction (LS-THC) representation of the electron repulsion integral (ERI) tensor. LS-THC uses least-squares fitting to renormalize a two-sided pseudospectral decomposition of the ERI, over a physical-space quadrature grid. While this procedure is technically applicable with any choice of grid, the best efficiency is obtained when the quadrature is tuned to accurately reproduce the overlap metric for quadratic products of the primary orbital basis. Properly selected Becke DFT grids can roughly attain this property. Additionally, we provide algorithms for adopting the DVR techniques of the dynamics community to produce two different classes of grids which approximately attain this property. The simplest algorithm is radial discrete variable representation (R-DVR), which diagonalizes the finite auxiliary-basis representation of the radial coordinate for each atom, and then combines Lebedev-Laikov spherical quadratures and Becke atomic partitioning to produce the full molecular quadrature grid. The other algorithm is full discrete variable representation (F-DVR), which uses approximate simultaneous diagonalization of the finite auxiliary-basis representation of the full position operator to produce non-direct-product quadrature grids. The qualitative features of all three grid classes are discussed, and then the relative efficiencies of these grids are compared in the context of LS-THC-DF-MP2. Coarse Becke grids are found to give essentially the same accuracy and efficiency as R-DVR grids; however, the latter are built from explicit knowledge of the basis set and may guide future development of atom-centered grids. F-DVR is found to provide reasonable accuracy with markedly fewer points than either Becke or R-DVR schemes.

  14. TESIS experiment on EUV imaging spectroscopy of the Sun

    NASA Astrophysics Data System (ADS)

    Kuzin, S. V.; Bogachev, S. A.; Zhitnik, I. A.; Pertsov, A. A.; Ignatiev, A. P.; Mitrofanov, A. M.; Slemzin, V. A.; Shestov, S. V.; Sukhodrev, N. K.; Bugaenko, O. I.

    2009-03-01

    TESIS is a set of solar imaging instruments in development by the Lebedev Physical Institute of the Russian Academy of Science, to be launched aboard the Russian spacecraft CORONAS-PHOTON in December 2008. The main goal of TESIS is to provide complex observations of solar active phenomena from the transition region to the inner and outer solar corona with high spatial, spectral and temporal resolution in the EUV and Soft X-ray spectral bands. TESIS includes five unique space instruments: the MgXII Imaging Spectroheliometer (MISH) with spherical bent crystal mirror, for observations of the Sun in the monochromatic MgXII 8.42 Å line; the EUV Spectoheliometer (EUSH) with grazing incidence difraction grating, for the registration of the full solar disc in monochromatic lines of the spectral band 280-330 Å; two Full-disk EUV Telescopes (FET) with multilayer mirrors covering the band 130-136 and 290-320 Å; and the Solar EUV Coronagraph (SEC), based on the Ritchey-Chretien scheme, to observe the inner and outer solar corona from 0.2 to 4 solar radii in spectral band 290-320 Å. TESIS experiment will start at the rising phase of the 24th cycle of solar activity. With the advanced capabilities of its instruments, TESIS will help better understand the physics of solar flares and high-energy phenomena and provide new data on parameters of solar plasma in the temperature range 10-10K. This paper gives a brief description of the experiment, its equipment, and its scientific objectives.

  15. Living systems in hypomagnetic conditions of Space

    NASA Astrophysics Data System (ADS)

    Trukhanov, Kirill; Gurieva, Tamara; Dadasheva, Olga; Spassky, Andrey; Lebedev, Viktor; Kruglov, Oleg

    Living Systems in Hypomagnetic Conditions of Space Trukhanov К. A.1, Guryeva T.S.1, Dadasheva О.А.1, Spassky А.V.2, Lebedev V.М.2, Kruglov О.S.1 1 SSC RF - Institute of bio-medical problems RAS, Moscow 2 Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow When working at a long-term lunar base, at stations in the near-moon space and during interplanetary missions cosmonauts will be continuously exposed to an entirely new environmental factor - hypomagnetic conditions (HMC). Interplanetary magnetic field and the field on the Lunar surface is three-five orders of magnitude below the usual geomagnetic field (GMF). It is well known that exposure to even a slightly decreased GMF adversely affect human and other living systems. Nervous, endocrine, cardiovascular systems and blood are considered to be the most sensitive to reduced GMF. There are some data in literature about the significant vulnerability of developing organism to the HMC. In this paper we present the results of further studies on the impact of the HMC on the embryogenesis of the Japanese quail (Coturnix coturnix japonica), including the works performed as the development of studies reported at the conferences COSPAR 37 and COSPAR 39. Duration of quail embryos exposure to different values of attenuation HMC (till thousandfold and more) came up to 18 days. It is shown that the prolonged exposure to the HMC heightens the adverse effects on embryogenesis. The background of alternating electromagnetic fields of the systems and equipment will exist at the habitable base or on the board of the spacecraft. The results of studies on the combined effects of HMC and weak alternating magnetic fields are also presented.

  16. Density Structure of the Upper Mantle in the Middle East and Surroundings: Interaction of Diverse Tectonic Processes

    NASA Astrophysics Data System (ADS)

    Kaban, M. K.; El Khrepy, S.; Al-Arifi, N. S.

    2015-12-01

    The Middle East is a very complex region combining several tectonic regimes, which are linked together. Density heterogeneity of the upper mantle, which is related to temperature and compositional variations, is one of the principal factors governing tectonic processes. Therefore, a comprehensive density model of the upper mantle is a key for understanding of these processes. Here we use seismic, gravity and tomography data to construct a 3D density model of the lithosphere and upper mantle and to identify main factors responsible for density variations. At the first stage we use a recent crustal model (Stolk et al., 2013) to estimate gravity effect of the crust and to remove it from the observed fields. As a result, the residual mantle gravity anomalies and residual topography are calculated. In addition we remove the impact of deep density variations below 325 km as estimated by a recent instantaneous dynamic model of the mantle (Kaban et al., 2014). We invert the residual fields jointly with seismic tomography data to image density distribution within the crust and upper mantle. The inversion technique accounts for the fact that the residual gravity and residual topography are controlled by the same factors but in a different way, e.g. depending on depth and wavelength. This provides a possibility for remarkably better vertical resolution of the resulting density model. As the initial approximation, we employ the seismic tomography model of Schaeffer and Lebedev (2013). Velocity variations are converted to density by applying mineral physics constrains. This model is adjusted in the inversion to fit both residual mantle gravity and topography. The obtained density variations are very significant; their amplitude somewhere exceeds 60 kg/m3 relative to a reference model. The most pronounced decrease of the mantle density corresponds to the Gulf of Aden spreading axis, the Red sea and the Afar zone. The maximum density of the upper mantle is associated with the

  17. Ten Years Timing of Millisecond Pulsars at Kalyazin

    NASA Astrophysics Data System (ADS)

    Ilyasov, Yu. P.; Oreshko, V. V.

    2006-08-01

    Precise timing of millisecond binary pulsars has been started at Kalyazin radio astronomical observatory since 1995. (Tver' region, Russia). Binary pulsars: J0613-02, J1020+10, J1640+22, J1643-12, J1713+07, J2145-07 and isolated millisecond pulsar B1937+21 have been included among the Kalayazin Pulsar Timing Array (KPTA). The Backer's pulsar B1937+21 is being monitored at Kalyazin observatory (0.6 GHz) and Kashima space research centre of the National Institute of Communication Technology (NICT, Japan) (2.2 GHz) simultaneously from 1996, as well. .At Kalyazin pulsars are observed at 0.6 GHz by a full steerable 64-m dish radio telescope RT-64 of the Special Research Bureau of the Moscow Power Engineering Institute. Filter-bank receiver of PRAO Lebedev Physical Institute is used for observations in two circular polarizations by 80 channels per each. Bandwidth per channel is 40 kHz, so total band is 3.2 MHz and time resolution is about 10 μs per channel. Now a perfect data base of pulses Time of Arrival (TOA) are collected with refer to the Solar system barycenter for about 10 years period. Main aim is: a) to study Pulsar Time and to establish a long-term standard of time based on pulsars ensemble as space long life clock alternative to atomic standards; b) to detect gravitational waves extremely low frequency belong to the Gravity Wave Background - GWB. After ten years monitoring of B1937+21 its timing noise is looking as "white phase noise" with RMS about 1.8 μs.( Fractional instability is about 6.10^-15). After these data and timing results of binary pulsar J1640+22 gravitational natural GWB upper limit should be reduced till to less than Ω[g]h^2 <10^-7-10^ -9 . Secular changes of DM toward millisecond pulsar B1937+21 was revealed after long time two frequency timing observations (Kalyazin -0,6 and Kashima -2.3).

  18. Seismic Tomography of the Continental United States from a Joint Inversion of Surface Waves and Body Waves

    NASA Astrophysics Data System (ADS)

    Golos, E. M.; Yao, H.; Zhang, H.; Fang, H.; Burdick, S.; Schaeffer, A. J.; Vernon, F.; Lebedev, S.; van der Hilst, R. D.

    2015-12-01

    We present a model of seismic velocity anomalies for the entire continental United States—coast to coast, surface to lower mantle—using a joint body wave-surface wave inversion. This technique (Zhang et al., 2014), performed on a global adaptively-spaced grid, exploits the good vertical resolution at shallow depths of surface wave data, and the sampling of the deep mantle by teleseismic body (P and S) waves. The resultant model has better resolution at all depths than either method alone, enabling evaluation of interactions between lithospheric and mantle processes. We utilize the depth-dependence of surface wave sensitivity kernels to express surface wave phase velocity data directly in terms of spatial velocity structure (Fang et al., 2015). The data used are Rayleigh wave phase velocities from earthquakes and ambient noise (Schaeffer and Lebedev, 2013; Ekström, 2014) and S phase travel times from USArray, measured at the Array National Facility (ANF). We include a suite of synthetic tests to verify the performance of the inversion and compare it to results from traditional tomographic methods. We also use P arrivals and the influence of Vp on Rayleigh wave propagation speed to generate a preliminary model of Vp variations, independent from but consistent with the Vs model. Our model corroborates the well-established pattern of slow anomalies in the western US, especially in the Basin and Range and Rio Grande Rift regions. New details emerge in the eastern US, thanks to increasing data from the region. A distinction is observed between widespread fast lithospheric anomalies, associated with stable cratonic material, and deeper fast features, associated with the remnants of the Farallon Plate. It has been proposed that these fragments, near the mantle transition zones, still affect mantle dynamics (Forte et al., 2007), so better resolution of these anomalies is an important advancement. In addition, slower velocities are observed beneath the Appalachians and

  19. 3D structural model of the North Alpine Foreland Basin, Bavarian Part

    NASA Astrophysics Data System (ADS)

    Przybycin, Anna M.; Scheck-Wenderoth, Magdalena; Schneider, Michael

    2013-04-01

    under the Alps. Comparing it to recently published LABs (e.g. Legendre et al. 2012) a good match can be noticed concerning the overall depth trend. References Birner, Mayr, Thomas, Schneider, Baumann & Winkler (2011) "Hydrochemistry and evolution of deep groundwaters in the Malm aquifer in the Bavarian part of the South German Molasse Basin"; Zeitschrift Geologischer Wissenschaften 39 (3/4) Legendre, Meier, Lebedev, Friedrich and Viereck-Götte (2012) "A shear wave velocity ,odel oft he European upper mantle from automated inversion of seismic shear and surface waveforms", Geophysical Journal International 191, 282-304 Lüschen, Borrini, Gebrande, Lammerer, Millahn, Neubauer, Nicolich (2006) "TRANSALP - deep crustal Vibroseis and explosive seismic profiling in the Eastern Alps", Tectonophysics 414

  20. Advances in astronomy (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 27 February 2013)

    NASA Astrophysics Data System (ADS)

    2013-07-01

    A scientific session of the Division of Physical Sciences of the Russian Academy of Sciences (RAS), entitled "Advances in Astronomy" was held on 27 February 2013 at the conference hall of the Lebedev Physical Institute, RAS. The following reports were put on the session agenda posted on the website http://www.gpad.ac.ru of the RAS Physical Sciences Division: (1) Chernin A D (Sternberg Astronomical Institute, Moscow State University, Moscow) "Dark energy in the local Universe: HST data, nonlinear theory, and computer simulations"; (2) Gnedin Yu N (Main (Pulkovo) Astronomical Observatory, RAS, St. Petersburg) "A new method of supermassive black hole studies based on polarimetric observations of active galactic nuclei"; (3) Efremov Yu N (Sternberg Astronomical Institute, Moscow State University, Moscow) "Our Galaxy: grand design and moderately active nucleus"; (4) Gilfanov M R (Space Research Institute, RAS, Moscow) "X-ray binaries, star formation, and type-Ia supernova progenitors"; (5) Balega Yu Yu (Special Astrophysical Observatory, RAS, Nizhnii Arkhyz, Karachaevo-Cherkessia Republic) "The nearest 'star factory' in the Orion Nebula"; (6) Bisikalo D V (Institute of Astronomy, RAS, Moscow) "Atmospheres of giant exoplanets"; (7) Korablev O I (Space Research Institute, RAS, Moscow) "Spectroscopy of the atmospheres of Venus and Mars: new methods and new results"; (8) Ipatov A V (Institute of Applied Astronomy, RAS, St. Petersburg) "A new-generation radio interferometer for fundamental and applied research". Summaries of the papers based on reports 1, 2, 4, 7, 8 are given below. • Dark energy in the nearby Universe: HST data, nonlinear theory, and computer simulations, A D Chernin Physics-Uspekhi, 2013, Volume 56, Number 7, Pages 704-709 • Investigating supermassive black holes: a new method based on the polarimetric observations of active galactic nuclei, Yu N Gnedin Physics-Uspekhi, 2013, Volume 56, Number 7, Pages 709-714 • X-ray binaries and star formation, M R

  1. A new method of ARGO buoys system observation data interpolation

    NASA Astrophysics Data System (ADS)

    Zakharova, Natalia; Agoshkov, Valery; Parmuzin, Eugene

    2013-04-01

    Study and solution of geophysical hydrodynamics problems are based on experimental and observation data from different sources. Despite large amount of observation data, availability of them often remains insufficient because data are provided on sets of irregular points and during the asynchronous moments of time. In this work a new method of temperature fields creation on regular grids according to observation data is offered taking into account a transfer by their currents. By means of this method it is possible to receive "pseudo-observations" for the required moment of time and, thereby, to solve a problem of an asynchronism of geophysical information. The results of numerical experiments on the World Ocean area within ARGO buoys system data are given. This study was supported by the Russian Foundation for Basic Research (project 11-01-12046, 12-05-00469) and by the Russian Federal target Program "Research and educational human resources for innovative Russia" (project 8219) for 2009-2013 and the Federal target program "Researches and development in priority fields of scientific and technological complex of Russia for 2007-2013" (project 11.519.11.1005) and the Ministry of education and science of Russia, project 14.A18.21.1901. References 1. Zakharova N.B., Agoshkov V.I., Parmuzin E.I., The new method of ARGO buoys system observation data interpolation. Russian Journal of Numerical Analysis and Mathematical Modelling. Vol. 28, Issue 1, 2013. 2. Agoshkov V.I., Zakharova N.B., The creation of piecewise - harmonic interpolation on spherical surfaces. Russian Journal of Numerical Analysis and Mathematical Modelling. Vol. 27, Issue 6, 2012. 3. Zakharova N.B., Lebedev S.A., Interpolation of on-line data of the ARGO buoys system for data assimilation in the World ocean circulation model. Actual problems in remote sensing of the Earth from space: Principal physics, physical methods and technologies for monitoring of environment, of potentially dangerous occurrences

  2. Energy transmission by laser

    NASA Astrophysics Data System (ADS)

    Apollonov, V. V.

    2015-02-01

    Laser spark obtained by using a conical optics is much more appropriate to form conducting channels in atmosphere. Only two types of lasers are actively considered to be used in forming high-conductivity channels in atmosphere, controlled by laser spark: pulsed sub-microsecond gas and chemical lasers (CO2, DF) and short pulse solid-state and UV lasers. Main advantage of short pulse lasers is their ability in forming of superlong ionised channels with a characteristic diameter of ~ 100 mkm in atmosphere along the beam propagation direction. At estimated electron densities below 1016 cm-3 in these filaments and laser wavelengths in the range of 0.5 - 1.0 mm, the plasma barely absorbs laser radiation. In this case, the length of the track composed of many filaments is determined by the laser intensity and may reach many kilometers at a femtosecond pulse energy of ~ 100 mJ. However, these lasers could not be used to form high-conductivity long channels in atmosphere. The ohmic resistance of this type a conducting channels turned out to be very high, and the gas in the channels could not be strongly heated (< 1 J). An electric breakdown controlled by radiation of femtosecond solid-state laser was implemented in only at a length of 3 m with a voltage of 2 MV across the discharge gap (670 kV/m). Not so long ago scientific group from P.N. Lebedev has improved that result, the discharge gap -1m had been broken under KrF laser irradiation when switching high-voltage (up to 390 kV/m) electric discharge by 100-ns UV pulses. Our previous result - 16 m long conducting channel controlled by a laser spark at the voltage - 3 MV - was obtained more than 20years ago in Russia and Japan by using pulsed CO2 laser with energy - 0.5 kJ. An average electric field strength was < 190 kV/m. It is still too much for efficient applications.

  3. New paleomagnetic and paleointensity results from plio-pleistocene volcanic sequences from southern Georgia

    NASA Astrophysics Data System (ADS)

    Sánchez Moreno, E. M.; Calvo-Rathert, M.; Gogichaishvili, A.; Tauxe, L.; Vashakidze, G. T.; Lebedev, V. A.; Morales, J.; Carrancho, Á.; Villalain, J. J.; Caccavari, A.

    2015-12-01

    The Plio-Pleistocene volcanism in the Djavakheti Highland is characterized by a great number of consecutive lava flows of great extension and reduced thickness. These features combined with available K-Ar dates (Lebedev et al., 2008 and per. com.), provides the right context to study a reliable and constant record of the EMF. The present study was performed on 2 different volcanic sequences. The first one, Apnia is formed of 20 basaltic lava flows and the second one, Korxi, of 27 andesitic lava flows. Paleomagnetic measurements yielded a characteristic component in all flows with normal, transitional and reverse polarities being obtained. The Apnia sequence, (3.75 ± 0.25 and 3.09 ± 0.10 My), starts with 13 reverse-polarity flows, which are followed by 2 transitional ones with 5 normal ones in the uppermost part of the section. Comparison with the expected EMF direction shows that while the direction of the reverse polarity group agrees well with the expected one, the direction of the normal polarity group shows a significant difference. The Korxi sequence is divided into two different subsequences of 17 and 10 flows separated by an erosional surface. The lower group has an age of 3.25 ± 0.25 My, and shows a succession of normal polarity flows close to the expected direction. The upper one, (1.9 ± 0.2 My), mainly displays reverse polarity flows with 3 interspersed transitional ones. Rock magnetic measurements including thermomagnetic, IRM acquisition and hysteresis curves were performed to check the suitability of the studied rocks for paleointensity experiments. Paleointensities were determined using three different methods: Multi-specimen, Thellier-Thellier and IZZI. The ultimate goal is to find out how paleointensity varies in relation to the observed polarity changes and anomalous directions. Using different techniques for determining the paleointensity, will also increase the reliability of determinations in cases in which an agreement in the results is

  4. EDITORIAL: Special issue containing papers presented at the 12th International Workshop on H-mode Physics and Transport Barriers Special issue containing papers presented at the 12th International Workshop on H-mode Physics and Transport Barriers

    NASA Astrophysics Data System (ADS)

    Hahm, T. S.

    2010-06-01

    Edge Localized Modes. The selection of topics and overview speakers and the scientific programme were carried out by the International Advisory Committee, consisting of: R. Groebner (GA, USA), T.S. Hahm (PPPL, USA--Chair), A. Hubbard (MIT, USA), K. Ida (NIFS, Japan), S. Lebedev (Ioffe Institute, Russia), N. Oyama (JAEA, Japan), G. Saibene (F4E, EU) and W. Suttrop (IPP, Germany). Their work, advice, and participation contributed to the success of the meeting. Finally, I would like to express deep gratitude to J. Jones and B. Sarfaty who took care of numerous issues relating to the organization of the meeting, and to J.K. Park and several graduate students of the Princeton University Plasma Physics Program for helping with the transportation of participants.

  5. Current COIL research in Samara

    NASA Astrophysics Data System (ADS)

    Nikolaev, Valeri D.

    1996-02-01

    Development of the high pressure singlet oxygen generator (SOG) is a very important aspect for chemical oxygen-iodine laser (COIL). Increasing of oxygen pressure up to 30 torr and more at conserving high O2(1(Delta) ) yield and maintaining BHP temperature at minus (10 divided by 20) degrees Celsius permits us to decrease ration [H2O]/[O2] to 5% and less. In this case COIL can operate successfully without a water vapor trap. With raising the total pressure Reynolds number increases too, diminishing boundary layers in supersonic nozzles and improving pressure recovery. The weight and dimensions of the SOG and laser become reduced for the same gas flow rate. For solving these problems the jet SOG has been suggested and developed in Lebedev Physical Institute, Samara Branch. The advantages of the jet SOG consist of the following: (1) Large and controlled specific surface of contact liquid-gas provides for high mass transfer efficiency. (2) High jets velocity guarantees fast basic hydrogen peroxide (BHP) surface renovation. (3) High gas velocity in the reaction zone diminishes O2(1(Delta) ) quenching. (4) Efficient gas-liquid heat exchange eliminates the gas heating and generation water vapor due O2(1(Delta) ) quenching. (5) Counterflowing design of the jet SOG produces the best conditions for self-cleaning gas flow of droplets in the reaction zone and gives the possibility of COIL operation without droplets separator. High pressure jet SOG has some features connected with intrachannel jet formation, free space jets reconstruction, interaction jets ensemble with counter moving gas flow and drag part of gas by jets, disintegrating jets, generation and separation of droplets, heat effects, surface renovation, impoverishment BHP surface by HO2- ions, moving solution film on the reaction zone walls, etc. In this communication our current understanding of the major processes in the jet SOG is set forth. The complex gas and hydrodynamic processes with heat and mass transfer

  6. Automated inter-station phase velocity measurements across the eastern Mediterranean and Middle East

    NASA Astrophysics Data System (ADS)

    El-Sharkawy, Amr; Weidle, Christian; Christiano, Luigia; Soomro, Riaz; Lebedev, Sergi; Meier, Thomas

    2016-04-01

    presented here. For selected inter-station paths, inversions for the 1D path-average S-wave velocity structure are shown. Our broadband surface wave measurements, utilizing the dense sampling of the area with newly available data, can offer important new insights into the structure and evolution of the lithosphere beneath the entire region. Key words: Surface waves, Fundamental modes, Dispersion Curves, Inversion, 1D Models. Reference: Soomro, R.A., C. Weidle, L. Cristiano, S. Lebedev, T. Meier. Phase velocities of Rayleigh and Love waves in central and northern Europe from automated, broadband, inter-station measurements, Geophys. J. Int., 204, 517-534, 2016.

  7. On searching applicants for mechanism of solar-lithosphere relations

    NASA Astrophysics Data System (ADS)

    Kairatkyzy, Dina; Andreyev, Alexey; Zhumabayeva, Saltanat; Seraliyev, Alibek

    2016-04-01

    It is actively discussed at present a question on possible influence of solar activity (high-speed solar wind streams bearing the "frozen" magnetic field lines of the Sun) on the stress status of the lithosphere and, consequently, on the Earth's seismic activity (e.g. Zhang, 1998, Acta Seismologica Sinica; Khachikyan et al., EGU2016-2754-1; IUGG2015-3132). There are at least two ideas on possible applicants for physical mechanism of solar-lithosphere relations: (i) - the muons of cosmic rays, which can penetrate the Earth's crust to a depth of at least the first ten kilometers and in tense seismic environment generate nuclear-electromagnetic cascade which energy can be a trigger of earthquake (Tsarev and Chechin, 1988, Preprint № 179, Physical Institute after Lebedev, Moscow); (ii) - the geomagnetic storms (Sobolev et al., 1998, Physics of the Earth #7) when the high-frequency oscillations of the geomagnetic field during the main phase of the storm generate significant induction currents which electric energy entering into the crust can be converted into mechanical energy increasing the stress status of the lithosphere (Sobolev and Demin, Mechano-electric phenomena into the Earth. M . Nauka. 1980). Besides this, among the possible cosmogenic factors changing the stress state of the lithosphere, could be the variation of the angular velocity of rotation of the Earth (e.g. Bostrom, 2000. Tectonic consequence of the Earth's Rotation), if it depends on solar activity variations. More of 50 years ago, Munk and Donald (The Rotation of the Earth, Cambrige University Press, 1960) suggested that the interaction between solar wind and geomagnetic field would probably influence the short period variation of angular velocity of the Earth. In this work, we check up this suggestion on the base of very precise data on the length of day (LOD) from 1986 to the present, which are presented by the International Earth Rotation and Reference Systems Service (IERS). Using the methods

  8. Effects of Magnetic and Non-Magnetic Impurities in MgB2: A Point-Contact Study of Single Crystals

    NASA Astrophysics Data System (ADS)

    Daghero, D.

    2007-03-01

    We studied the effects of chemical substitutions, either magnetic (Mn) or non-magnetic (Al, C), on the energy gaps of MgB2 by means of directional point-contact spectroscopy (PCS) in state-of-the-art single crystals. Here we discuss two noticeable cases, i.e. Mg1-xMnxB2 crystals with x up to 0.015, and Mg1-xAlxB2 crystals with x up to 0.32. In both cases, we used a pressure-less PCS technique in which a thin Au wire is put in contact with the side surface of the crystal by means of a small drop of Ag paint. The gaps δσ and δπ were obtained through a two-band Blonder-Tinkham-Klapwijk (BTK) fit of the Andreev-reflection conductance curves of the resulting contacts. Both in Mn- and Al-doped MgB2, the gaps decrease on decreasing the critical temperature of the contacts, Tc^A (at which the Andreev-reflection structures disappear), but remain clearly distinct down to Tc^A˜10 K. Once analysed within the two-band Eliashberg theory, the δσ and δπ vs. Tc^A curves give information about the effects of Mn and Al substitutions on the different scattering channels (interband and intraband, magnetic or non-magnetic). It turns out that the main effect of Mn is to increase the spin-flip scattering within the σ band (with smaller contributions from either the π-π or the σ-π channels), as also confirmed by first-principle bandstructure calculations. In the case of Al, the band-filling effect is largely dominant. An increase in non-magnetic interband scattering is possible, but small enough not to give rise to gap merging. In collaboration with G.A. Ummarino, A. Calzolari, M. Tortello, D. Delaude, R.S. Gonnelli, Dipartimento di Fisica and CNISM, Politecnico di Torino, Italy; V.A. Stepanov, P.N. Lebedev Physical Institute, RAS, Moscow, Russia; N.D. Zhigadlo, J. Karpinski, Laboratory for Solid State Physics, ETHZ, Zurich, Switzerland; and S. Massidda, Dipartimento di Fisica, Universitàdi Cagliari, Italy.

  9. Large-scale shear velocity structure of the upper mantle beneath Europe and surrounding regions

    NASA Astrophysics Data System (ADS)

    Legendre, C. P.; Meier, T. M.; Lebedev, S.; Friederich, W.

    2009-12-01

    The automated multimode waveform inversion technique developed by Lebedev et al. (2005) was applied to available data of broadband stations in Europe and surrounding regions. It performs a fitting of the complete waveform starting from the S-wave onset to the surface wave. Assuming the location and focal mechanism of a considered earthquake as known, the first basic step is to consider each available seismogram separately and to find the 1D-model that can explain the filtered seismogram best. In a second step, each 1D-model serves as a linear constraint in an inversion for a 3D S-wave velocity model of the upper mantle. We collected data for the years from 1990 to 2006 from all permanent stations for which data were available via the data centers of ORFEUS, GEOFON amd IRIS, and from others that build the Virtual European Seismological Network (VEBSN). In addition, we incorporated data from temporary experiments like SVEKALAPKO, TOR and the Eifel plume project as well as permanent stations in France. Just recently we were also able to add the data recorded by the temporary broadband EGELADOS network in the southern Aegean. In this way, a huge data set of about 500000 seismograms came about from which about 60000 1D-models could be constructed. The resulting models exhibit an overwhelming structural detail in relation to the size of the region considered in the inversion. They are to our knowledge the most detailed models of shear wave velocity currently available for the European upper mantle and surroundings. Most prominent features are an extremely sharp demarcation of the East European platform from Western Europe. Narrow high velocity regions follow the Hellenic arc and the Ionian trench toward the north. Whereas high velocities are found beneath the western Alps between about 100 km to 200 km depth, the eastern Alps show a low velocity anomaly at these depths. Low velocity zones are found at depths around 150 km in the Pannonian basin, the back-arc of the

  10. Large-scale shear velocity structure of the upper mantle beneath Europe and surrounding regions

    NASA Astrophysics Data System (ADS)

    Legendre, Cédric; Meier, Thomas; Lebedev, Sergei; Friederich, Wolfgang; Egelados Working Group

    2010-05-01

    The automated multimode waveform inversion technique developed by Lebedev et al. (2005) was applied to available data of broadband stations in Europe and surrounding regions. It performs a fitting of the complete waveform starting from the S-wave onset to the surface wave. Assuming the location and focal mechanism of a considered earthquake as known, the first basic step is to consider each available seismogram separately and to find the velocity perturbations that can explain the filtered seismogram best. In a second step, each velocity perturbations serves as a linear constraint in an inversion for a 3D S-wave velocity model of the upper mantle. We collected data for the years from 1990 to 2006 from all permanent stations for which data were available via the data centers of ORFEUS, GEOFON and IRIS, and from others that build the Virtual European Seismological Network (VEBSN). In addition, we incorporated data from temporary experiments like SVEKALAPKO, TOR and the Eifel plume project as well as permanent stations in France. Just recently we were also able to add the data recorded by the temporary broadband EGELADOS network in the southern Aegean. In this way, a huge data set of about 500000 seismograms came about from which about 60000 1D-models could be constructed. The resulting models exhibit an overwhelming structural detail in relation to the size of the region considered in the inversion. They are to our knowledge the most detailed models of shear wave velocity currently available for the European upper mantle and surroundings. Most prominent features are an extremely sharp demarcation of the East European platform from Western Europe. Narrow high velocity regions follow the Hellenic arc and the Ionian trench toward the north. Whereas high velocities are found beneath the western Alps between about 100 km to 200 km depth, the eastern Alps show a low velocity anomaly at these depths. Low velocity zones are found at depths around 150 km in the Pannonian

  11. CONFERENCES AND SYMPOSIA: Nanoplasmonics and metamaterials(Scientific session of the Division of Physical Sciences, Russian Academy of Sciences, 27 April 2009)

    NASA Astrophysics Data System (ADS)

    Tikhodeev, Sergei G.; Shubina, Tat'yana V.; Ivanov, Sergei V.; Toropov, Aleksei A.; Kop'ev, Petr S.; Kurin, Vladislav V.; Lagarkov, Andrei N.; Sarychev, Andrei K.; Gippius, Nikolai A.

    2009-09-01

    On 27 April 2009, in the conference hall of the Lebedev Physical Institute, Russian Academy of Sciences, a scientific session of the Division of Physical Sciences of the Russian Academy of Sciences devoted to the problem of nanoplasmonics and metamaterials took place. The following reports were presented at the session: (1) Tikhodeev S G, Gippius N A (Prokhorov Institute of General Physics, Russian Academy of Sciences, Moscow) "Plasmon-polariton effects in nanostructured metal-dielectric photonic crystals and metamaterials"; (2) Shubina T V, Ivanov S V, Toropov A A, Kop'ev P S (Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg) "Plasmon effects in In(Ga)N-based nanostructures"; (3) Kurin V V (Institute of Physics of Microstructures, Russian Academy of Sciences, Nizhnii Novgorod) "Resonance scattering of light in nanostructured metallic and ferromagnetic films"; (4) Lagarkov A N , Sarychev A K (Institute of Theoretical and Applied Electrodynamics, Joint Institute of High Temperatures, Russian Academy of Sciences, Moscow) "Active optical metamaterials"; (5) Gippius N A, Tikhodeev S G (Prokhorov Institute of General Physics, Russian Academy of Sciences, Moscow) "Application of the scattering matrix method for calculating the optical properties of metamaterials." Summaries of reports 1-3 and 5 and of an article written on the basis of report 4 are given below. • Plasmon-polariton effects in nanostructured metal-dielectric photonic crystals and metamaterials, S G Tikhodeev, N A Gippius Physics-Uspekhi, 2009, Volume 52, Number 9, Pages 945-949 • Plasmon effects in In(Ga)N-based nanostructures, T V Shubina, S V Ivanov, A A Toropov, P S Kop'ev Physics-Uspekhi, 2009, Volume 52, Number 9, Pages 949-953 • Resonance scattering of light in nanostructured metallic and ferromagnetic films, V V Kurin Physics-Uspekhi, 2009, Volume 52, Number 9, Pages 953-959 • Superresolution and enhancement in metamaterials, A N Lagarkov, A K Sarychev, V N

  12. Observations of late-type variable stars in the water-vapor radio line. The supergiant VX Sagittarii

    NASA Astrophysics Data System (ADS)

    Pashchenko, M. I.; Rudnitskii, G. M.

    1999-05-01

    Observations of the circumstellar maser emission of the M supergiant VX Sgr in the water-vapor line at 1.35 cm are presented. The observations were carried out from 1981-1998 (JD 2 444 655-2 450 966) on the 22-m radio telescope of the Pushchino Radio Astronomy Observatory of the Astro Space Center of the Lebedev Institute of Physics. Throughout the 17 years of the observations, there were two groups of emission features in the H2O-line profile, which originate in the two oppositely directed lobes of a bipolar outflow from the star. A redistribution of the integrated flux F_int between the two groups of features was noted: in 1981-1987, the group with negative velocities (V_LSR < V_*, where V_* is the stellar velocity) dominated; starting from 1993, F_int for the features with V_LSR > V_* slightly exceeded that for features with V_LSR < V_*. This redistribution of F_int in the H2O-line profile may be associated with a change in the dominant direction for the bipolar outflow due to restructuring of the overall dipolar magnetic field of VX Sgr. A model for the VX Sgr H2O maser source with a circumstellar disk and bipolar outflow in two cones with half-opening angle theta ~ 60deg is discussed. The axis of the bipolar outflow also forms an angle i ~ 60deg to the line of sight. The estimated bipolar-outflow expansion velocity V_0 in the H2O-maser region (R = (1.5-5) x 10^15 cm) is ~10 km/s. The variability of the H2O maser is correlated with the visual light curve of VX Sgr. However, the phase delay delta phi of the F_int(H2O) variations relative to the optical variations changed form 0 to ~1 stellar period (P = 732d) over the time covered by the maser observations. If the variability of the H2O-maser source is the result of periodic impacts of shock waves driven by stellar pulsations, the travel time for the shock from the photosphere to the inner boundary of the H2O maser shell may be as long as (10-15)P.

  13. EDITORIAL: Cluster issue on microplasmas

    NASA Astrophysics Data System (ADS)

    Chao, Chih C.; Liao, Jiunn-Der; Chang, Juu-En

    2008-10-01

    Ever since the first Workshop on Microplasmas, held in Japan in 2003, plasma scientists and engineers worldwide have been meeting approximately every 18 months to exchange and discuss the results of scientific research and technical applications of this unique type of plasma. Microplasmas are generally described as stable plasmas confined to spatial dimensions below about 1 mm that can be operated at pressures up to and exceeding atmospheric pressure. By their nature, this presents a wide range of opportunities and many advantages in practical applications, just a few examples being low energy consumption, small size, flexibility of use and ease of assembly into a user-friendly package. Nevertheless, there still remain several unanswered basic science questions and a largely untapped potential for environmental, biomedical and industrial applications. The fourth International Workshop on Microplasmas, held during 28-31 October 2007 in Tainan, Taiwan, continued the trend of previous Workshops with an orientation towards industrial and environmental applications. Many high-quality papers on microplasmas and microdischarges were presented and selected full papers were submitted to Journal of Physics D: Applied Physics for assessment by the editors and reviewers in accordance with the usual standards of quality and novelty. This Cluster Issue contains twelve accepted papers, covering four categories: fundamentals and basics, and environmental, biomedical and industrial applications. Fundamentals and basics includes coverage of the physics and microstructure of electrode discharge (Yu A Lebedev et al), the characteristics of low current discharge (Z Lj Petrović et al), plasma ignition (R Gesche et al), novel optical diagnostics (Schulz-von der Gathen et al), plasma generation and micronozzle flow (T Takahashi et al) and the relation between RF-power and atomic oxygen density distribution (N Knake et al). Environmental applications are represented by vapour

  14. Experiments for observation of the total solar eclipse on July 22, 2009, China

    NASA Astrophysics Data System (ADS)

    Stoeva, Penka; Stoev, Alexey; Kuzin, Sergey; Stoyanov, Nikolay; Pertsov, Andrey

    Scientific expedition for observation of the July 22, 2009 total solar eclipse was organized by the Solar-Terrestrial Influences Institute, BAS and the Yuri Gagarin Public Astronomical Observatory, and displaced near the observing station of the Shanghai Observatory, which belongs to the Chinese Academy of Sciences and is very close to the central line of the eclipse. The following experiments were conducted: 1. Determination of the absolute intensity of the red coronal line FeX 6374A with a spectro-grph mounted together with a 130/2000 Macsutov -Cassegrain telescope with a 20mm eyelense. The spectrogrph is designed and developed by specialists from Solar-Terrestrial Influences In-stitute, Stara Zagora Department, Bulgaria, Lebedev Physical Institute, Moscow, Russia and Yuri Gagarin Public Astronomical Observatory, Stara Zagora, Bulgaria, in the frames of the Bulgarian-Russian project of joint scientific research "CORONA". The aim of the experiment is to obtain images of the inner corona in the visible region of the spectrum simultaneously with images in the X ray region from the THESIS telescope on CORONAS -PHOTON helio-spheric satellite (launched in January 2009). This gives the unique possibility of determining the distribution of the light emission of the plasma with the temperature (detailed diagnostics of the thermal and nonthermal heating of the solar corona). 2. Investigation of the white-light corona from photographs with 250 mm and 2000mm objec-tives. 3. Investigation of the response of the Earth's atmosphere during the particular sircumstances in which solar light is totally being blocked by the Moon. Atmospheric temperature and pressure rapidly change during total solar eclipses which produce meteorological anomalies typical in this kind of phenomena. That is why the basic climatic parameters have to be measured with high sensitive meteorological instruments. Conducting measurements of the temperature of the soil and the air at three different levels

  15. Variational data assimilation system "INM RAS - Black Sea"

    NASA Astrophysics Data System (ADS)

    Parmuzin, Eugene; Agoshkov, Valery; Assovskiy, Maksim; Giniatulin, Sergey; Zakharova, Natalia; Kuimov, Grigory; Fomin, Vladimir

    2013-04-01

    Development of Informational-Computational Systems (ICS) for Data Assimilation Procedures is one of multidisciplinary problems. To study and solve these problems one needs to apply modern results from different disciplines and recent developments in: mathematical modeling; theory of adjoint equations and optimal control; inverse problems; numerical methods theory; numerical algebra and scientific computing. The problems discussed above are studied in the Institute of Numerical Mathematics of the Russian Academy of Science (INM RAS) in ICS for Personal Computers (PC). Special problems and questions arise while effective ICS versions for PC are being developed. These problems and questions can be solved with applying modern methods of numerical mathematics and by solving "parallelism problem" using OpenMP technology and special linear algebra packages. In this work the results on the ICS development for PC-ICS "INM RAS - Black Sea" are presented. In the work the following problems and questions are discussed: practical problems that can be studied by ICS; parallelism problems and their solutions with applying of OpenMP technology and the linear algebra packages used in ICS "INM - Black Sea"; Interface of ICS. The results of ICS "INM RAS - Black Sea" testing are presented. Efficiency of technologies and methods applied are discussed. The work was supported by RFBR, grants No. 13-01-00753, 13-05-00715 and by The Ministry of education and science of Russian Federation, project 8291, project 11.519.11.1005 References: [1] V.I. Agoshkov, M.V. Assovskii, S.A. Lebedev, Numerical simulation of Black Sea hydrothermodynamics taking into account tide-forming forces. Russ. J. Numer. Anal. Math. Modelling (2012) 27, No.1, 5-31 [2] E.I. Parmuzin, V.I. Agoshkov, Numerical solution of the variational assimilation problem for sea surface temperature in the model of the Black Sea dynamics. Russ. J. Numer. Anal. Math. Modelling (2012) 27, No.1, 69-94 [3] V.B. Zalesny, N.A. Diansky, V

  16. Special data base of Informational - Computational System 'INM RAS - Black Sea' for solving inverse and data assimilation problems

    NASA Astrophysics Data System (ADS)

    Zakharova, Natalia; Piskovatsky, Nicolay; Gusev, Anatoly

    2014-05-01

    Development of Informational-Computational Systems (ICS) for data assimilation procedures is one of multidisciplinary problems. To study and solve these problems one needs to apply modern results from different disciplines and recent developments in: mathematical modeling; theory of adjoint equations and optimal control; inverse problems; numerical methods theory; numerical algebra and scientific computing. The above problems are studied in the Institute of Numerical Mathematics of the Russian Academy of Science (INM RAS) in ICS for personal computers. In this work the results on the Special data base development for ICS "INM RAS - Black Sea" are presented. In the presentation the input information for ICS is discussed, some special data processing procedures are described. In this work the results of forecast using ICS "INM RAS - Black Sea" with operational observation data assimilation are presented. This study was supported by the Russian Foundation for Basic Research (project No 13-01-00753) and by Presidium Program of Russian Academy of Sciences (project P-23 "Black sea as an imitational ocean model"). References 1. V.I. Agoshkov, M.V. Assovskii, S.A. Lebedev, Numerical simulation of Black Sea hydrothermodynamics taking into account tide-forming forces. Russ. J. Numer. Anal. Math. Modelling (2012) 27, No.1, pp. 5-31. 2. E.I. Parmuzin, V.I. Agoshkov, Numerical solution of the variational assimilation problem for sea surface temperature in the model of the Black Sea dynamics. Russ. J. Numer. Anal. Math. Modelling (2012) 27, No.1, pp. 69-94. 3. V.B. Zalesny, N.A. Diansky, V.V. Fomin, S.N. Moshonkin, S.G. Demyshev, Numerical model of the circulation of Black Sea and Sea of Azov. Russ. J. Numer. Anal. Math. Modelling (2012) 27, No.1, pp. 95-111. 4. Agoshkov V.I.,Assovsky M.B., Giniatulin S. V., Zakharova N.B., Kuimov G.V., Parmuzin E.I., Fomin V.V. Informational Computational system of variational assimilation of observation data "INM RAS - Black sea"// Ecological

  17. Photochemical gas lasers and hybrid (solid/gas) blue-green femtosecond systems

    NASA Astrophysics Data System (ADS)

    Mikheev, L. D.; Tcheremiskine, V. I.; Uteza, O. P.; Sentis, M. L.

    2012-01-01

    The review summarizes milestones and major breakthrough results obtained in the course of the development of a photochemical method applied to optical excitation of gas lasers on electronic molecular transitions by radiation from such unconventional pump sources as high-temperature electrical discharges and strong shock waves in gas. It also describes principles and techniques applied in hybrid (solid/gas) high-intensity laser systems emitting in the blue-green spectral region, and discusses wavelength scaling of laser-matter interaction by the example of laser wake-field acceleration (LWFA), high-order harmonic generation (HHG) and “water window” soft X-ray lasers. One of the most significant results of the photochemical method development consists in emerging broad bandwidth lasers (XeF(C-A), Xe2Cl, and Kr2F) operating in the blue-green spectral range, which have potential for amplification of ultra-short (down to 10 fs) optical pulses towards the Petawatt peak power level. The main goal of this review is to argue that the active media of these lasers may provide a basis for the development of fs systems generating super-intense ultrashort laser pulses in the visible spectral range. Some specific hybrid schemes, comprising solid state front-ends and photodissociation XeF(C-A) power boosting amplifiers, are described. They are now under development at the Lasers Plasmas and Photonic Processes (LP3) Laboratory (Marseille, France), the P.N. Lebedev Physical Institute (Moscow, Russia) and the Institute of High-Current Electronics (Tomsk, Russia) with the aim of conducting proof-of-principle experiments. Some consequences of the visible-wavelength laser field interaction with matter are also surveyed to demonstrate advantages of short driver wavelength in the considered examples. One of the most important consequences is the possibility of coherent soft X-ray generation within the “water window” spectral range with the use of short wavelength driver pulses to

  18. Electromagnetic and acoustic waves in metamaterials and structures (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 24 February 2011)

    NASA Astrophysics Data System (ADS)

    2011-11-01

    The scientific session, titled "Electromagnetic and acoustic waves in metamaterials and structures", of the Physical Sciences Division of the Russian Academy of Sciences (RAS) was held on February 24, 2011 in the conference hall of the Lebedev Physical Institute, RAS. The agenda of the session announced on the website www.gpad.ac.ru of the RAS Physical Sciences Division featured presentation of the following reports: (1) Veselago V G (A M Prokhorov General Physics Institute, RAS, Moscow, and Moscow Institute of Physics and Technology, Dolgoprudnyi, Moscow region) "Waves in metamaterials: their role in modern physics"; (2) Burov V A, Voloshinov V B, Dmitriev K V, Polikarpova N V (Lomonosov Moscow State University, Moscow) "Acoustic waves in metamaterials, anisotropic crystals and anomalously refracting structures"; (3) Shvartsburg A B (Joint Institute for High Temperatures, RAS, Moscow), Erokhin N S (Space Research Institute, RAS, Moscow) "Resonant tunneling of ultrashort electromagnetic pulses in gradient metamaterials: paradoxes and prospects"; (4) Petnikov V G (A M Prokhorov General Physics Institute, RAS, Moscow), Stromkov A A (Institute of Applied Physics, RAS, Nizhny Novgorod) "Focusing of low-frequency sound fields on the ocean shelf"; (5) Luchinin A G, Khil'ko A I (Institute of Applied Physics, RAS, Nizhny Novgorod) "Low-mode acoustics of shallow water waveguides"; (6) Esipov I B (RAS Research Council on Acoustics, Moscow) "Basic results for 2010 in the field of acoustics as presented at a RAS Council session". Papers written on the basis of these oral presentations are published below. • Waves in metamaterials: their role in modern physics, V G Veselago Physics-Uspekhi, 2011, Volume 54, Number 11, Pages 1161-1165 • Acoustic waves in metamaterials, crystals, and anomalously refracting structures, V A Burov, V B Voloshinov, K V Dmitriev, N V Polikarpova Physics-Uspekhi, 2011, Volume 54, Number 11, Pages 1165-1170 • Resonant tunneling of ultrashort

  19. CONFERENCES AND SYMPOSIA: Commemoration of the centenary of the birth of S.M. Rytov (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 26 November 2008)

    NASA Astrophysics Data System (ADS)

    Gulyaev, Yurii V.; Barabanenkov, Yurii N.; Kaplan, Alexander E.; Volkov, S. N.; Klyatskin, Valery I.; Dolin, Lev S.

    2009-05-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) was held in the Conference Hall of the P N Lebedev Physical Institute, RAS on November 26, 2008. The session was dedicated to the 100th anniversary of the birth of Sergei Mikhailovich Rytov. The following reports were presented at the session: (1) Gulyaev Yu V (V A Kotel'nikov Institute of Radioengineering and Electronics, RAS, Moscow) "Sergei Mikhailovich Rytov (Opening address)"; (2) Barabanenkov Yu N (V A Kotel'nikov Institute of Radioengineering and Electronics, RAS, Moscow) "Asymptotic limit of the radiative transfer theory in problems of multiple wave scattering in randomly inhomogeneous media"; (3) Kaplan A E, Volkov S N (Johns Hopkins University, Baltimore, USA) "Local fields in nanolattices of strongly interacting atoms: nanostrata, giant resonances, 'magic numbers', and optical bistability"; (4) Klyatskin V I (A M Obukhov Institute of Atmospheric Physics, RAS, Moscow) "Modern methods for the statistical description of dynamical stochastic systems"; (5) Dolin L S (Institute of Applied Physics, RAS, Nizhny Novgorod) "Development of the radiative transfer theory as applied to instrumental imaging in turbid media". An abridge version of the reports is given below. • Sergei Mikhailovich Rytov (Opening address), Yu V Gulyaev Physics-Uspekhi, 2009, Volume 52, Number 5, Pages 499-502 • Asymptotic limit of the radiative transfer theory in problems of multiple wave scattering in randomly inhomogeneous media, Yu N Barabanenkov Physics-Uspekhi, 2009, Volume 52, Number 5, Pages 502-506 • Local fields in the nanolattices of strongly interacting atoms: nanostrata, giant resonances, 'magic numbers', and optical bistability, A E Kaplan, S N Volkov Physics-Uspekhi, 2009, Volume 52, Number 5, Pages 506-514 • Modern methods for the statistical description of dynamical stochastic systems, V I Klyatskin Physics-Uspekhi, 2009, Volume 52, Number 5, Pages 514-519

  20. PREFACE: Third International Workshop & Summer School on Plasma Physics 2008

    NASA Astrophysics Data System (ADS)

    Benova, E.; Dias, F. M.; Lebedev, Yu

    2010-01-01

    participants who sent their manuscripts and passed through the (sometimes heavy and troublesome) refereeing and editing procedure and our referees for their patience and considerable effort to improve the manuscripts. We greatly appreciate the financial support from the sponsors: the Department for Language Teaching and International Students at the University of Sofia, the Austrian Science and Research Liason Offices and the Bulgarian Nuclear Society. We would like to express our gratitude to the invited lecturers who were willing to pay the participation fee. In this way, in addition to the intellectual support they provided by means of their excellent lectures, they also supported the school financially. E Benova, F M Dias and Yu Lebedev

  1. Visible-range hybrid femtosecond systems based on a XeF(C-A) amplifier: state of the art and prospects

    NASA Astrophysics Data System (ADS)

    Alekseev, S. V.; Aristov, A. I.; Grudtsyn, Ya V.; Ivanov, N. G.; Koval'chuk, B. M.; Losev, B. F.; Mamaev, S. B.; Mesyats, Gennadii A.; Mikheev, L. D.; Panchenko, Yu N.; Polivin, A. V.; Stepanov, S. G.; Ratakhin, N. A.; Yalovoi, V. I.; Yastremskii, Arkadii G.

    2013-03-01

    Results of experimental and theoretical investigations of the hybrid (solid state/gas) visible-range femtosecond systems THL-100 (IHCE SB RAS) and THL-30 (P.N. Lebedev Physics Institute) based on a Ti : sapphire front end and a photochemical XeF(C-A) amplifier are reported. The front end generates 50-fs optical pulses with the second-harmonic (475 nm) energy of up to 5 mJ. The active medium of the amplifier is produced in a mixture XeF2 - N2 subjected to VUV radiation of xenon excited by an electron beam. The computer model is developed for calculating parameters of the XeF(C - A) amplifier, which is in a good agreement with experiments. In the THL-100 system with the 25-cm output aperture of the XeF(C-A) amplifier, a record visible-range femtosecond radiation peak power of 14 GW was obtained in a 50-fs pulse with the time contrast of above 108. The measured power of an amplified spontaneous emission of the XeF(C-A) amplifier in the angle of 0.2 mrad was 32 W. The result obtained testifies that the hybrid approach to the development of ultrahigh-power systems provides a high time contrast of radiation (greater than 1012 for the projected peak power of 100 TW). In the THL-30 system, prospects for shortening an amplified femtosecond pulse are studied and it is experimentally shown that by compensating a third-order dispersion in a hybrid system one can obtain pulses with duration of at least 27 fs with a recompression of amplified pulses in bulk glass. Also, a new phenomenon was observed of spectrum broadening and self-compression of negatively chirped femtosecond pulses in the visible range under a nonlinear interaction of wide-aperture beams with fused silica. This result opens prospects for development of the new methods of selfcompression for femtosecond pulses that are lacking physical limitations on pulse energy and realisation of self-compression of amplified pulses in the output window of the XeF(C-A) amplifier.

  2. PREFACE: International Workshop '60 Years of the Casimir Effect'

    NASA Astrophysics Data System (ADS)

    Barton, Gabriel; Carugno, Giovanni; Dodonov, Victor; Man'ko, Margarita

    2009-07-01

    consists of work devoted to the current status of the theory and measurements related to Casimir forces. Readers must be warned that some topics in this field of research remain controversial (especially the dependence on temperature): they can and do generate debates that sometimes become quite heated. These controversies are reflected in the papers. We believe that at present it is not the business of conference organisers to adjudicate such issues, and hope that detailed expositions of different approaches and different points of view will help readers to formulate their own, and will eventually lead to a better understanding of the problems and of the solutions proposed. The other three groups contain contributions bearing on (1) topics related to causes and consequences of Casimir effects in quantum field theory and gravitation; (2) the so-called dynamical (or nonstationary) Casimir effect and motion-induced radiation, (3) some new manifestations and applications of the Casimir effect. We are grateful to the authors for making their papers so interesting; to the referees for their careful reading of the initial versions, and for their many helpful comments and suggestions; to the Institute of Physics for its kindness in offering to publish these Proceedings in Journal of Physics: Conference Series; and to the Institute of Physics office at the Lebedev Physical Institute in Moscow for essential help in the preparation of this volume. On behalf of the participants of the workshop, we thank the direction and staff of the ICCMP for their splendid organization of the event. Finally we acknowledge the support of the Brazilian scientific funding agencies FAP-DF and CNPQ, which covered the local and travel expenses of many participants. The Editors Gabriel Barton (University of Sussex, Brighton, UK) Giovanni Carugno (INFN - Sezione di Padova, Italy) Victor Dodonov (University of Brasilia, Brazil) Margarita Man'ko (Lebedev Physical Institute, Moscow, Russia) Workshop

  3. EDITORIAL: The 18th Central European Workshop on Quantum Optics The 18th Central European Workshop on Quantum Optics

    NASA Astrophysics Data System (ADS)

    Sánchez-Soto, Luis L.; Man'ko, Margarita A.

    2012-02-01

    decided that Physica Scripta could offer a poster prize (200 euros + certificate) for young scientists (less than 30 years old) at the annual CEWQO conference. A panel of experts was formed to judge the posters which included Apostol Vourdas, University of Bradford, UK (Chairman), Alberto Ibort, University Carlos III of Madrid, Spain, Andrei Klimov, University of Guadalajara, Mexico, Margarita A Man'ko, P N Lebedev Physical Institute, Moscow, Russia and Antonino Messina, University of Palermo, Italy. The poster ''How can we check the uncertainty relation?'' by Vladimir Chernega, PhD student of the P N Lebedev Physical Institute, won the prize. The 19th Central European Workshop on Quantum Optics will be held in Sinaia, Romania on 2-6 July 2012. It will be chaired by Professor Aurelian Isar from the Horia Hulubei National Institute for Research and Development in Physics and Nuclear Engineering, Bucharest.

  4. PREFACE: 30th EPS Conference on Controlled Fusion and Plasma Physics

    NASA Astrophysics Data System (ADS)

    Koch, R.; Lebedev, S.

    2003-12-01

    The 30th EPS Conference on Controlled Fusion and Plasma Physics took place in St Petersburg, Russian Federation, on 7th--11th July 2003. It was jointly organized by the Ioffe Physico-Technical Institute, the St Petersburg State Polytechnical University and Technical University Applied Physics Ltd, on behalf of the Plasma Physics Division of the European Physical Society (EPS). The members of the local organizing committee were drawn from these institutions: B Kuteev, Chair, Polytechnical University S Lebedev, Vice-Chair, Ioffe Institute A Lebedev, Scientific Secretary, Ioffe Institute V Bakharev, TUAP Ltd V Grigor'yants, Ioffe Institute V Sergeev, Polytechnical University N Zhubr, Ioffe Institute Over the years, the annual conference of the Plasma Physics Division of the European Physical Society has widened its scope. Contributions to the present conference covered widely diversified fields of plasma physics, ranging from magnetic and inertial fusion to low temperature plasmas. Plasma sizes under investigation ranged from tiny to astronomical. The topics covered during the conference were distributed over the following categories: tokamaks, stellarators, high intensity laser produced plasmas and inertial confinement, alternative magnetic confinement, plasma edge physics, plasma heating and current drive, diagnostics, basic plasma physics, astrophysical and geophysical plasmas and low temperature plasmas. The scientific programme and paper selection were the responsibility of the Programme Committee appointed by the Board of the EPS Plasma Physics Division. The committee was composed of: R Koch, Chairman, ERM/KMS Brussels, Belgium E Ascasibar, CIEMAT Madrid, Spain S Atzeni, Università di Roma, Italy G Bonhomme, LPMI Nancy, France C Chiuderi, Università di Firenze, Italy B Kuteev, St Petersburg State Polytechnical,University, Russian Federation M Mauel, Contact person APS-DPP, Columbia University New York, USA R A Pitts, EPFL/CRPP Lausanne, Switzerland R Salomaa

  5. 100th anniversary of the birth of I Ya Pomeranchuk (Extended session of the all-institute seminar at the Alikhanov Institute for Theoretical and Experimental Physics, 5 - 6 June 2013)

    NASA Astrophysics Data System (ADS)

    2014-02-01

    On 5 - 6 June 2013, an extended session of the all-institute seminar was held at the Russian Federation State Scientific Center 'Alikhanov Institute for Theoretical and Experimental Physics' (ITEP). It was devoted to the 100th anniversary of the birth of Academician Isaak Yakovlevich Pomeranchuk, the founder of the Theory Department of ITEP. The announced agenda of the session on the ITEP website http://www.itep.ru/rus/Pomeranchuk100.html contained the following reports: (1) Gershtein S S (SRC 'Institute for High Energy Physics', Protvino, Moscow region) "I Ya Pomeranchuk and the large accelerator";(2) Keldysh L V (Lebedev Physical Institute, RAS (FIAN), Moscow) "Dynamic tunneling";(3) Vaks V G (National Research Centre 'Kurchatov Institute' (NRC KI), Moscow) "Brief reminiscences";(4) Smilga A V (Laboratoire Physique Subatomique et des technologies associées, Université de Nantes, France) "Vacuum structure in 3D supersymmetric gauge theories";(5) Khriplovich I B (Budker Institute of Nuclear Physics, SB RAS, Novosibirsk) "Gravitational four-fermion interaction and early Universe dynamics";(6) Dremin I M (FIAN, Moscow) "Elastic scattering of hadrons";(7) Belavin A A (Landau Institute of Theoretical Physics, RAS, Moscow) "Correlators in minimal string models";(8) Voloshin M B (Theoretical Physics Institute, University of Minnesota, USA) "Exotic quarkonium";(9) Nekrasov N A (Institut des hautes études scientifiques (IHES), France) "BPS/CFT correspondence";(10) Zarembo K (Uppsala Universitet, Sweden) "Exact results in supersymmetric theories and AdS/CFT correspondence";(11) Gorsky A S (ITEP, Moscow) "Baryon as a dyon instanton";(12) Blinnikov S I (ITEP, Moscow) "Mirror substance and other models for dark matter";(13) Rubakov V A (Institute for Nuclear Research, RAS, Moscow) "Test-tube Universe";(14) Kancheli O V (ITEP, Moscow) "50 years of reggistics";(15) Shevchenko V I (NRC KI) "In search of the chiral magnetic effect";(16) Kirilin V P (ITEP, Moscow) "Anomalies and

  6. Mapping the Moho with seismic surface waves: Sensitivity, resolution, and recommended inversion strategies

    NASA Astrophysics Data System (ADS)

    Lebedev, Sergei; Adam, Joanne; Meier, Thomas

    2013-04-01

    first-step results used as reference. We illustrate this strategy with an application to data from the Kaapvaal Craton. Prior information on crustal and mantle structure reduces the trade-offs and thus enables resolving the Moho depth with noisier data; such information should be sought and used whenever available (as has been done, explicitly or implicitly, in many previous studies). Joint analysis or inversion of surface-wave and other data (receiver functions, topography, gravity) can reduce uncertainties further and facilitate Moho mapping. Alone or as a part of multi-disciplinary datasets, surface-wave data offer unique sensitivity to the crustal and upper-mantle structure and are becoming increasingly important in the seismic imaging of the crust and the Moho. Reference Lebedev, S., J. Adam, T. Meier. Mapping the Moho with seismic surface waves: A review, resolution analysis, and recommended inversion strategies. Tectonophysics, "Moho" special issue, 10.1016/j.tecto.2012.12.030, 2013.

  7. EDITORIAL: Semiconductor lasers: the first fifty years Semiconductor lasers: the first fifty years

    NASA Astrophysics Data System (ADS)

    Calvez, S.; Adams, M. J.

    2012-09-01

    achievements in the June 1987 Special Issue of IEEE Journal of Quantum Electronics. The Millennium Issue of IEEE Journal of Selected Topics in Quantum Electronics presented a further set of articles on historical aspects of the subject as well as a 'snapshot' of current research in June 2000. It is not the intention here to duplicate any of this historical material that is already available, but rather to complement it with personal recollections from researchers who were involved in laser development in the USA, France, Russia and the UK. Hence, in addition to fascinating accounts of the discovery of the theoretical condition for stimulated emission from semiconductors and of the pioneering work at IBM, there are two complementary views of the laser research at the Lebedev Institute, and personal insights into the developments at STL and at Bell Laboratories. These are followed by an account of the scientific and technological connections between the early pioneering breakthroughs and the commercialisation of semiconductor laser products. Turning to the papers from today's researchers, there is coverage of many of the current 'hot' topics including quantum cascade lasers, mid-infrared lasers, high-power lasers, the exciting developments in understanding and exploiting the nonlinear dynamics of lasers, and photonic integrated circuits with extremely high communication data capacity, as well as reports of recent progress on laser materials such as dilute nitrides and bismides, photonic crystals, quantum dots and organic semiconductors. Thanks are due to Jarlath McKenna for sterling support from IOP Publishing and to Peter Blood for instigating this Special Issue and inviting us to serve as Guest Editors.

  8. The subglacial Lake Vostok (East Antarctica) surface snow is Earth-bound DNA (and dust)-free

    NASA Astrophysics Data System (ADS)

    Bulat, S.; Marie, D.; Bulat, E.; Alekhina, I.; Petit, J.-R.

    2012-09-01

    The objective was to assess the microbial cell abundance in the surface snow in Central East Antarctica and the fate of microbial genomic DNA during summer short-time exposure to surface climatic (and radiation) conditions at Vostok using flow cytometry and DNA-based methods. The surface snow (until 4m deep) was collected as clean as possible in the vicinity of the Vostok station (3 sites - courtesy of A Ekaykin and ASC Lebedev Physical Iinstitute RAS) and towards the Progress station (4 more sites with one just 29km from the coast - courtesy of A Ekaykin and S Popov) in specially decontaminated plastic crates or containers of various volumes (up to 75 kg of snow). All subsequent snow treatment manipulations (melting, concentrating, genomic DNA extraction, primary PCR set up) were performed in clean room laboratory facilities (LGGE, UJF-CNRS, Grenoble, France). Cell concentrations were determined on meltwater aliquots prepared under clean room conditions using flow cytofluorometry (Biostation, Roscoff, France). The highly concentrated meltwater (until 10000 times down) was used to extract gDNA which were subjected to bacterial 16S rRNA genes amplification in PCR and sequencing. The gDNA of a complex mesophile microbial community for exposure trials were also prepared and put onto a filter under strict clean room conditions. The filters were got exposed open to solar radiation and surface temperature at Vostok during January for various time duration periods (from 25 to 1 day). As a result no microbial cells were confidently detected in surface snow samples differed by sampling sites and people asked to collect as well. Complementary the mineral dust particle abundance did not exceed 16 mkg per liter with the particle size mode about 2.5 mkm as shown using Coulter counter. Preliminary amongst the microparticles no unusual findings (e.g. spherules of cosmic origin) were observed by shape and element composition using electron scanning microscopy. The gDNA studies

  9. CONFERENCES AND SYMPOSIA: Extragalactic astronomy (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 28 October 2009)

    NASA Astrophysics Data System (ADS)

    2010-07-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS), "Extragalactic astronomy", was held in the Conference Hall of the Kapitza Institute for Physical Problems, RAS, on 28 October 2009. The following reports were put on the session agenda posted on the web site www.gpad.ac.ru of the Physical Sciences Division, RAS: (1) Varshalovich D A, Ivanchik A V, Balashev S A (Ioffe Physical Technical Institute, RAS) "Big Bang nucleosynthesis of deuterium and HD/H2 molecular abundances in interstellar clouds of 12 Gyr ago"; (2) Aptekar R L, Golenetskii S V, Mazets E P (Ioffe Physical Technical Institute, RAS). "Studies of cosmic gamma-ray bursts and gamma repeaters with the Ioffe Institute Konus experiments"; (3) Beskin G M, Karpov S V (Special Astrophysical Observatory, RAS), Bondar S V (Scientific Research Institute of Precision Instrument Making) "Discovery of the fast optical variability of the GRB 080319B gamma burst and the prospects for wide-angle high time resolution optical monitoring"; (4) Starobinskii A A (Landau Institute for Theoretical Physics, RAS) "Experimental and theoretical investigation of dark matter in the Universe"; (5) Zasov A V, Sil'chenko O K (Shternberg State Astronomical Institute, Lomonosov Moscow State University) "Galactic disks and their evolution"; (6) Burdyuzha V V (Astro-Space Center of the Lebedev Physics Institute) "Dark components of the Universe". Papers based of reports 1-3, 5, and 6 are published below. A A Starobinskii's extended report will be presented in the form of a review, which is planned for publication in one of the forthcoming issues of Physics-Uspekhi. • Big Bang nucleosynthesis of deuterium and HD/H2 molecular abundances in interstellar clouds of 12 Gyr ago, D A Varshalovich, A V Ivanchik, S A Balashev, P Petitjean Physics-Uspekhi, 2010, Volume 53, Number 4, Pages 397-401 • Cosmic gamma-ray bursts and gamma repeaters studies with Ioffe Institute Konus experiments, R L Aptekar, S

  10. PREFACE: Particles and Fields: Classical and Quantum

    NASA Astrophysics Data System (ADS)

    Asorey, M.; Clemente-Gallardo, J.; Marmo, G.

    2007-07-01

    , Germany) G. F. Dell Antonio (Universitá di Roma La Sapienza, Italy) A. Galindo (Universidad Complutense de Madrid, Spain) S. L. Glashow (Boston University, USA) A. M. Gleeson (University of Texas, Austin, USA) C. R. Hagen (Rochester University, NY, USA) J. Klauder (University of Florida, Gainesville, USA) A. Kossakowski (University of Torun, Poland) V.I. Manko (Lebedev Physical Institute, Moscow, Russia) G. Marmo (Universitá Federico II di Napoli e INFN Sezione di Napoli, Italy) N. Mukunda (Indian Institute of Science, Bangalore, India) J. V. Narlikar (Inter-University Centre for Astronomy and Astrophysics, Pune, India) J. Nilsson (University of Goteborg, Sweden) S. Okubo (Rochester University, NY, USA) T. Regge (Politecnico di Torino, Italy) W. Schleich (University of Ulm, Germany) M. Scully (Texas A& M University, USA) S. Weinberg (University of Texas, Austin, USA)

    Local Organizing Committee

  11. CONFERENCES AND SYMPOSIA: Seventy years of the Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Waves Propagation (IZMIRAN) (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 25 November 2009)

    NASA Astrophysics Data System (ADS)

    2010-08-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences dedicated to the 70th anniversary of the Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of the Russian Academy of Sciences (IZMIRAN) (Troitsk, Moscow region) was held in the conference hall of IZMIRAN on 25 November 2009. The following reports were put on the session agenda posted on the web site www.gpad.ac.ru of the Physical Sciences Division, RAS: (1) Gurevich A V (Lebedev Physical Institute RAS, Moscow) "The role of cosmic rays and runaway electron breakdown in atmospheric lightning discharges"; (2) Aleksandrov E B (Ioffe Physical Technical Institute, RAS, St. Petersburg) "Advances in quantum magnetometry for geomagnetic research"; (3) Dorman L I (IZMIRAN, Troitsk, Moscow region, CR & SWC, Israel) "Cosmic ray variations and space weather"; (4) Mareev E A (Institute of Applied Physics, RAS, Nizhnii Novgorod) "Global electric circuit research: achievements and prospects"; (5) Tereshchenko E D, Safargaleev V V (Polar Geophysical Institute, Kola Research Center, RAS, Murmansk) "Geophysical research in Spitsbergen Archipelago: status and prospects"; (6) Gulyaev Yu V, Armand N A, Efimov A I, Matyugov S S, Pavelyev A G, Savich N A, Samoznaev L N, Smirnov V V, Yakovlev O I (Kotel'nikov Institute of Radio Engineering and Electronics RAS, Fryazino Branch, Fryazino, Moscow region) "Results of solar wind and planetary ionosphere research using radiophysical methods"; (7) Kunitsyn V E (Lomonosov Moscow State University, Moscow) "Satellite radio probing and the radio tomography of the ionosphere"; (8) Kuznetsov V D (IZMIRAN, Troitsk, Moscow region) "Space Research at the Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences." Papers based on reports 2-8 are published below. The main contents of report 1 are reproduced in A V Gurevich's review, "Nonlinear effects in the ionosphere" [Phys. Usp. 50

  12. Commemoration of the centenary of the birth of Academician S N Vernov(Joint scientific session of the Physical Sciences Division of the Russian Academy of Sciences and the Department of Physics of M V Lomonosov Moscow State University, 16 June 2010)

    NASA Astrophysics Data System (ADS)

    2011-02-01

    On 16 June 2010, a joint scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS), Joint Physical Society of the Russian Federation, Scientific Council of the Department of Physics of Moscow State University (MSU), Scientific Council of the MSU SINP, RAS Council on Space Research, Coordination Scientific and Technical Council of the Federal Space Agency, RAS Scientific Council on the Integrated Problem of Cosmic Rays and RAS Scientific Council on Physics of Solar-Terrestrial Relations took place at the R V Khokhlov central physics auditorium of the MSU Department of Physics. The session was devoted to the 100th anniversary of the birth of Academician Sergei Nikolaevich Vernov.The agenda of the session announced on the website www.gpad.ac.ru of the RAS Physical Sciences Division listed the following reports:Ryazhskaya O G (RAS Institute for Nuclear Research, Moscow) "Opening address"; (1) Matveev V A (RAS Physical Sciences Division, Moscow) "A few words about S N Vernov" (2) Sadovnichy V A (M V Lomonosov Moscow State University, Moscow) "S N Vernov as a scientist at Moscow State University"; (3) Trukhin V I (M V Lomonosov Moscow State University, Moscow) "S N Vernov as a professor in the MSU Department of Physics"; (4) Panasyuk M I (D V Skobeltsyn Institute of Nuclear Physics of M V Lomonosov Moscow State University, Moscow) "Cosmic ray astrophysics before and after 1957"; (5) Dergachev V A (RAS A F Ioffe Physical-Technical Institute, St. Petersburg) "S N Vernov and space physics: Apatity-Leningrad, 1968-1983"; (6) Stozhkov Yu I ( P N Lebedev Physical Institute, RAS, Moscow) "S N Vernov and ground-breaking studies of cosmic rays in the stratosphere"; (7) Berezhko E G, Krymsky G F (Yu G Shafer Institute of Cosmophysical Research and Aeronomy of the SB RAS Yakutsk Scientific Center, Yakutsk) "S N Vernov and cosmic ray research in Yakutia".Texts of the articles based on the reports presented are printed below. • Opening address, O

  13. Large-scale shear velocity structure of the upper mantle beneath Europe and surrounding regions

    NASA Astrophysics Data System (ADS)

    Legendre, C.; Meier, T.; Lebedev, S.; Friederich, W.

    2009-04-01

    The automated multimode waveform inversion technique developed by Lebedev et al., (2005) was applied to available data of broadband stations in Europe and surrounding regions. The Automated Multimode Inversion Method (AMI) foots on an inversion technique originally invented by Nolet (1991) which he called partitioned waveform inversion. It performs a fitting of the complete waveform starting from the S-wave onset to the surface wave. Assuming that the location and focal mechanism of a considered earthquake are known, the first basic step is to consider each available seismogram separately and to to derive from it linear constrains, which are later used to construct the 3D-model. Inversion parameters are variations of shear velocity in the mantle and Moho depth. The theoretical background of AMI is the pure-path approximation which assumes propagation of waves in and around the vertical plane containing source and receiver. AMI extends the partitioned waveform inversion to a completely automated procedure with automated data quality checks and an automated assessment of the quality of fit obtain when determining the linear constrains from the observed seismogram. In this way, large volumes of data can be efficiently inverted for 3D-mantle structure. We collected all available data for the years from 1990 to 2007 from permanent stations in and around Europe via the data centers of ORFEUS, GEOFON and IRIS. In addition, we incorporated data from temporary experiments like ETSE array, SVEKALAPKO, TOR and the Eifel plume project. Just recently we were also able to add the data recorded by the EGELADOS network from the GEOFON data archive. In this way, a huge data set of about 500.000 seismograms came about from which about 65.000 1D-models could be constructed. The reduction of usable seismograms is caused by (1) mislocation or/and errors in the CMT solutions, (2) the rigorous automatic quality checks implemented in AMI, and (3) the elimination of seismograms for which

  14. Walking to Olympus: An EVA Chronology

    NASA Technical Reports Server (NTRS)

    Portree, David S. F.; Trevino, Robert C.

    1997-01-01

    display the large num- ber of flights in which EVA played a role. This approach also makes apparent significant EVA gaps, for example, the U.S. gap between 1985 and 1991 following the Challenger accident. This NASA History Monograph is an edited extract from an extensive EVA Chronology and Reference Book being produced by the EVA Project Office, NASA Johnson Space Center, Houston, Texas. The larger work will be published as part of the NASA Formal Series in 1998. The authors gratefully acknowledge the assistance rendered by Max Ary, Ashot Bakunts, Gert-Jan Bartelds, Frank Cepollina, Andrew Chaikin, Phillip Clark, Richard Fullerton, Steven Glenn, Linda Godwin, Jennifer Green, Greg Harris, Clifford Hess, Jeffrey Hoffman, David Homan, Steven Hopkins, Nicholas Johnson, Eric Jones, Neville Kidger, Joseph Kosmo, Alexei Lebedev, Mark Lee, James LeBlanc, Dmitri Leshchenskii, Jerry Linenger, Igor Lissov, James McBarron, Clay McCullough, Joseph McMann, Story Musgrave, Dennis Newkirk, James Oberg, Joel Powell, Lee Saegesser, Andy Salmon, Glen Swanson, Joseph Tatarewicz, Kathy Thornton, Chris Vandenberg, Charles Vick, Bert Vis, David Woods, Mike Wright, John Young, and Keith Zimmerman. Special thanks to Laurie Buchanan, John Charles, Janet Kovacevich, Joseph Loftus, Sue McDonald, Martha Munies, Colleen Rapp, and Jerry Ross. Any errors remain the responsibility of the authors.

  15. Features of the Caucasian segment of the Alpine-Himalayan-Indonesian Convergence Zone

    NASA Astrophysics Data System (ADS)

    Sharkov, E.

    2012-04-01

    anomalies (Artemiev, 1973; Artemieva et al., 2006). We suggest that the positive anomaly considers with ascending of a mantle plume and .negative anomalies - with descending mantle flows on each its side (Sharkov, 2011). The main feature of this segment of the AHICZ is a presence of two late Cenozoic andesite-latite volcanic arcs: Anatolian-Caucasian and Caucasian-Elbursian, which jointed in area of TCTU. Such type of volcanism is also traced to the south practically through the whole zone of the syntaxis till to Van Lake area in Turkey. These volcanics are close to subduction-related magmas on their petrological and geochemical features, however, there are no clear evidences of the present-day subduction in the area of Neogene-Quaternary volcanism: crustal-level earthquakes predominated here (Gugunava, 1981; Sandvol et al., 2003). It suggests that such type of magmatism appeared as a result of interaction of a mantle plume head with continental crust under condition of continental plates collision (Lebedev et al., 2011). So, the Caucasus is an area of the present-day active interaction of deep-seated mantle processes with shallow lithosphere under conditions of the largest modern convergence zone.

  16. Applications of High Intensity Proton Accelerators

    NASA Astrophysics Data System (ADS)

    Raja, Rajendran; Mishra, Shekhar

    2010-06-01

    Superconducting radiofrequency linac development at Fermilab / S. D. Holmes -- Rare muon decay experiments / Y. Kuno -- Rare kaon decays / D. Bryman -- Muon collider / R. B. Palmer -- Neutrino factories / S. Geer -- ADS and its potential / J.-P. Revol -- ADS history in the USA / R. L. Sheffield and E. J. Pitcher -- Accelerator driven transmutation of waste: high power accelerator for the European ADS demonstrator / J. L. Biarrotte and T. Junquera -- Myrrha, technology development for the realisation of ADS in EU: current status & prospects for realisation / R. Fernandez ... [et al.] -- High intensity proton beam production with cyclotrons / J. Grillenberger and M. Seidel -- FFAG for high intensity proton accelerator / Y. Mori -- Kaon yields for 2 to 8 GeV proton beams / K. K. Gudima, N. V. Mokhov and S. I. Striganov -- Pion yield studies for proton driver beams of 2-8 GeV kinetic energy for stopped muon and low-energy muon decay experiments / S. I. Striganov -- J-Parc accelerator status and future plans / H. Kobayashi -- Simulation and verification of DPA in materials / N. V. Mokhov, I. L. Rakhno and S. I. Striganov -- Performance and operational experience of the CNGS facility / E. Gschwendtner -- Particle physics enabled with super-conducting RF technology - summary of working group 1 / D. Jaffe and R. Tschirhart -- Proton beam requirements for a neutrino factory and muon collider / M. S. Zisman -- Proton bunching options / R. B. Palmer -- CW SRF H linac as a proton driver for muon colliders and neutrino factories / M. Popovic, C. M. Ankenbrandt and R. P. Johnson -- Rapid cycling synchrotron option for Project X / W. Chou -- Linac-based proton driver for a neutrino factory / R. Garoby ... [et al.] -- Pion production for neutrino factories and muon colliders / N. V. Mokhov ... [et al.] -- Proton bunch compression strategies / V. Lebedev -- Accelerator test facility for muon collider and neutrino factory R&D / V. Shiltsev -- The superconducting RF linac for muon

  17. Celebrating the 65th anniversary of the Russian Federal Nuclear Center — All-Russian Research Institute of Experimental Physics (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 6 October 2010)

    NASA Astrophysics Data System (ADS)

    2011-04-01

    A scientific session of the Physical Sciences Division of the Russian Academy of Sciences (RAS) took place on 6 October 2010 in the Conference Hall of the Lebedev Physical Institute, RAS (FIAN) on the occasion of the 65th anniversary of founding of the Russian Federal Nuclear Center — All-Russian Research Institute of Experimental Physics (RFNC-VNIIEF).The agenda of the session announced on the website www.gpad.ac.ru of the RAS Physical Sciences Division listed the following reports: (1) Ilkaev R I (RFNC-VNIIEF, Sarov, Nizhny Novgorod region). Opening remarks "On the fundamental physics research programs at RFNC-VNIIEF" (2) Mikhailov A L (RFNC-VNIIEF, Sarov, Nizhny Novgorod region) "Hydrodynamic instabilities in various media"; (3) Trunin R F (RFNC-VNIIEF, Sarov, Nizhny Novgorod region) "Study of extreme states of metals using shock waves"; (4) Ivanovskii A V (RFNC-VNIIEF, Sarov, Nizhny Novgorod region) "Explosive magnetic energy generators and their application in research"; (5) Podurets A M (RFNC-VNIIEF, Sarov, Nizhny Novgorod region) "X-ray studies of the structure of matter in shock waves"; (6) Garanin S G (RFNC-VNIIEF, Sarov, Nizhny Novgorod region) "High-power lasers in studies of the physics of hot, dense plasma and thermonuclear fusion"; (7) Selemir V D (RFNC-VNIIEF, Sarov, Nizhny Novgorod region) "Physics research in ultrahigh magnetic fields"; (8) Mkhitar'yan L S (RFNC-VNIIEF, Sarov, Nizhny Novgorod region) "Gasdynamic thermonuclear fusion."Articles based on reports 1-7 are published below. An extended version of report 3 written as a review paper will be published in a later issue of Physics-Uspekhi. • Fundamental physics research at the All-Russian Research Institute of Experimental Physics, R I Ilkaev Physics-Uspekhi, 2011, Volume 54, Number 4, Pages 387-392 • Hydrodynamic instabilities, A L Mikhailov, N V Nevmerzhitskii, V A Raevskii Physics-Uspekhi, 2011, Volume 54, Number 4, Pages 392-397 • Extreme states of metals: investigation using shock

  18. Seismic signature of crustal magma and fluid from deep seismic sounding data across Tengchong volcanic area

    NASA Astrophysics Data System (ADS)

    Bai, Z. M.; Zhang, Z. Z.; Wang, C. Y.; Klemperer, S. L.

    2012-04-01

    . There are typical tectonic and deep origin mechanisms for the moderate-strong earthquakes nearby SP Tuantian, and precaution should be added on this area in case of the potential earthquake. Our fusion image also clearly revealed that there exist two remarkable positions on the Moho discontinuity through which the heat from the upper mantle was transmitted upward, and this is attributed to the widely distributed hot material within the crust and upper mantle. We acknowledge the financial support of the Ministry of Land and Resources of China (SinoProbe-02-02), and the National Nature Science Foundation of China (No. 41074033 and No. 40830315). Key Words: Seismic Signature, Magma, Tengchong Volcanic Area, Deep Seismic Sounding, Seismic Attribute Fusion Li, Chang, van der Hilst, D., Meltzer, A.S., Engdahl, E.R., 2008. Subduction of the Indian lithosphere beneath the Tibetan Plateau and Burma. Earth Planet. Sci. Lett. 274. doi:10.1016/j.epsl.2008.07.016. Lebedev, S., van der Hilst, R.D., 2008. Global upper-mantle tomography with the automated multi-mode surface and S waveforms. Geophys. J. Int. 173 (2), 505-518. Wang C.Y. and Huangfu G.. 2004. Crustal structure in Tengchong Volcano-Geothermal Area, western Yunnan, China. Tectonophysics, 380: 69-87.

  19. 100th anniversary of the birth of I Ya Pomeranchuk (Extended session of the all-institute seminar at the Alikhanov Institute for Theoretical and Experimental Physics, 5 - 6 June 2013)

    NASA Astrophysics Data System (ADS)

    2014-02-01

    On 5 - 6 June 2013, an extended session of the all-institute seminar was held at the Russian Federation State Scientific Center 'Alikhanov Institute for Theoretical and Experimental Physics' (ITEP). It was devoted to the 100th anniversary of the birth of Academician Isaak Yakovlevich Pomeranchuk, the founder of the Theory Department of ITEP. The announced agenda of the session on the ITEP website http://www.itep.ru/rus/Pomeranchuk100.html contained the following reports: (1) Gershtein S S (SRC 'Institute for High Energy Physics', Protvino, Moscow region) "I Ya Pomeranchuk and the large accelerator";(2) Keldysh L V (Lebedev Physical Institute, RAS (FIAN), Moscow) "Dynamic tunneling";(3) Vaks V G (National Research Centre 'Kurchatov Institute' (NRC KI), Moscow) "Brief reminiscences";(4) Smilga A V (Laboratoire Physique Subatomique et des technologies associées, Université de Nantes, France) "Vacuum structure in 3D supersymmetric gauge theories";(5) Khriplovich I B (Budker Institute of Nuclear Physics, SB RAS, Novosibirsk) "Gravitational four-fermion interaction and early Universe dynamics";(6) Dremin I M (FIAN, Moscow) "Elastic scattering of hadrons";(7) Belavin A A (Landau Institute of Theoretical Physics, RAS, Moscow) "Correlators in minimal string models";(8) Voloshin M B (Theoretical Physics Institute, University of Minnesota, USA) "Exotic quarkonium";(9) Nekrasov N A (Institut des hautes études scientifiques (IHES), France) "BPS/CFT correspondence";(10) Zarembo K (Uppsala Universitet, Sweden) "Exact results in supersymmetric theories and AdS/CFT correspondence";(11) Gorsky A S (ITEP, Moscow) "Baryon as a dyon instanton";(12) Blinnikov S I (ITEP, Moscow) "Mirror substance and other models for dark matter";(13) Rubakov V A (Institute for Nuclear Research, RAS, Moscow) "Test-tube Universe";(14) Kancheli O V (ITEP, Moscow) "50 years of reggistics";(15) Shevchenko V I (NRC KI) "In search of the chiral magnetic effect";(16) Kirilin V P (ITEP, Moscow) "Anomalies and

  20. Effect of crustal heterogeneities and effective rock strength on the formation of HP and UHP rocks.

    NASA Astrophysics Data System (ADS)

    Reuber, Georg; Kaus, Boris; Schmalholz, Stefan; White, Richard

    2015-04-01

    next step, we performed several hundred numerical simulations to understand the effects of km-scale heterogeneities and material parameters on pressure magnitudes, using a model setup that is otherwise very similar to the one of Li et al. (2010). Results show that significant non-lithostatic pressures occur if (lower) crustal rocks are dry or if km-scale (nappe-sized) heterogeneities with dryer rocks are present within the crust. Overpressure magnitudes can be up to 1 GPa or 100% and in some cases rock assemblages are temporarily in the coesite stability field at a depth of only 40 km, followed by rapid exhumation to the surface. Tectonic overpressures can vary strongly in magnitude versus time, but peak pressures are present sufficiently long for metamorphic reactions to occur. The presence of heterogeneities can affect the crustal-scaled deformation pattern, and the effective friction angle of crustal-scale rocks (or the dryness of these rocks) is a key parameter that determines the magnitude of non-lithostatic pressures. Our results thus reconcile previous findings and highlight the importance of having an accurate knowledge of the fluid-pressure, initial crustal structure and rock composition during continental collision. If rocks are dry by the time they enter a subduction zone, or are stronger/dryer than surrounding rocks, they are likely to develop significantly higher pressures than nearby rocks. This might explain the puzzling observation that some nappes have very high peak pressures, while juxtaposed nappes have much lower values, without clear structural evidence for deep burial and exhumation along a subduction channel of the high-pressure nappe. Our models might also give a partial explanation of why the reported timescales for high and ultra-high pressure stages of peak metamorphism are often very short. References: Burov, E., Francois, T., Agard, P., Le Pourhiet, L., Meyer, B., Tirel, C., Lebedev, S., Yamato, P., Brun, J.-P., 2014. Tectonophysics

    1. Adaptive re-tracking algorithm for retrieval of water level variations and wave heights from satellite altimetry data for middle-sized inland water bodies

      NASA Astrophysics Data System (ADS)

      Troitskaya, Yuliya; Lebedev, Sergey; Soustova, Irina; Rybushkina, Galina; Papko, Vladislav; Baidakov, Georgy; Panyutin, Andrey

      . [6] S.A. Lebedev, and A.G. Kostianoy, Satellite Altimetry of the Caspian Sea. Moscow : MORE, [in Russian], 2005. [7] P. A. M. Berry et al., “Global inland water monitoring from multi-mission altimetry”, Geophys. Res. Lett., vol. 32, pp. L16401, 2005. [8] S. Calmant, and F. Seyler, “Continental surface waters from satellite altimetry,” Geosciences C.R., vol. 338, pp. 1113-1122, 2006. [9] C. H. Davis, “A robust threshold retracking algorithm for measuring ice sheet surface elevation change from satellite radar altimeters,” IEEE Trans. Geosci. Remote Sens., vol. 35, pp. 974-979, 1997. [10] X. Deng, and W. E. Featherstone, “A coastal retracking system for satellite radar altimeter waveforms: Application to ERS-2 around Australia,” J. Geophys. Res., vol. 111, pp. C06012, 2006. [11] J. Guo et al., “Lake level variations monitored with satellite altimetry waveform retracking,” IEEE J. Sel. Topics Appl. Earth Obs., vol. 2(2), pp. 80-86, 2009. [12] Mercier F., Rosmorduc V., Carrere L., Thibaut P., Coastal and Hydrology Altimetry product (PISTACH) handbook. Version 1.0. 2010. [13] Yu.Troitskaya et al., “Satellite altimetry of inland water bodies,” Water Resources, vol. 39(2), pp.184-199, 2012. [14] Yu.Troitskaya et al., “Adaptive retracking of Jason-1 altimetry data for inland waters: the example of the Gorky Reservoir”, Int. J. Rem. Sens., vol. 33, pp. 7559-7578, 2012. [15] Yu.Troitskaya et al., , "Adaptive retracking of Jason-1,2 satellite altimetry data for the Volga river reservoirs ," IEEE J. Sel. Topics Appl. Earth Obs., issue 99, 2013, doi: 10.1109/JSTARS.2013.2267092.

    2. EDITORIAL: Squeeze transformation and optics after Einstein

      NASA Astrophysics Data System (ADS)

      Kim, Young S.; Man'ko, Margarita A.; Planat, Michel

      2005-12-01

      With this special issue, Journal of Optics B: Quantum and Semiclassical Optics contributes to the celebration of the World Year of Physics held in recognition of five brilliant papers written by Albert Einstein in 1905. There is no need to explain to the readers of this journal the content and importance of these papers, which are cornerstones of modern physics. The 51 contributions in this special issue represent current trends in quantum optics —100 years after the concept of light quanta was introduced. At first glance, in his famous papers of 1905, Einstein treated quite independent subjects—special relativity, the nature and statistical properties of light, electrodynamics of moving bodies and Brownian motion. We now know that all these phenomena are deeply related, and these relations are clearly shown in many papers in this issue. Most of the papers are based on the talks and poster contributions from participants of the 9th International Conference on Squeezed States and Uncertainty Relations (ICSSUR'05), which took place in Besançon, France, 2-6 May, 2005. This was the continuation of a series of meetings, originating with the first workshops organized by Professor Y S Kim at the University of Maryland, College Park, USA, in 1991 and by Professor V I Man'ko at the Lebedev Physical Institute, Moscow in 1992. One of the main topics of ICSSUR'05 and this special issue is the theory and applications of squeezed states and their generalizations. At first glance, one could think that this subject has no relation to Einstein's papers. However, this is not true: the theory of squeezed states is deeply related to special relativity, as far as it is based on the representations of the Lorentz group (see the paper by Kim Y S and Noz M E, S458-S467), which also links the current concepts of entanglement and decoherence with Lorentz-covariance. Besides, studies of the different quantum states of light imply, after all, the study of photon (or photo

    3. The 13th International Workshop on H-mode Physics and Transport Barriers (Oxford, UK, 2011) The 13th International Workshop on H-mode Physics and Transport Barriers (Oxford, UK, 2011)

      NASA Astrophysics Data System (ADS)

      Saibene, G.

      2012-11-01

      as to stimulate and lead the open discussion. Poster sessions were also organized to present specialist papers and provide a venue for continued discussion. The topics selected for this edition of the workshop were: 1. Integrated plasma scenarios for ITER and a reactor: experimental and theoretical studies, including the self-stabilizing transport approach. 2. Edge transport barrier control and plasma performance: physics of 3D stochastic magnetic fields for ELM suppression. 3. H-mode transition physics and H-mode pedestal structure: pedestal dynamics near transitions and requirements for high-confinement access and sustainment. 4. Energetic particle driven instabilities and related physics: H-mode and the transport barrier. 5. Role of and evidence for non-diffusive particle and toroidal momentum transport and impact of fuelling: experiments, theory and modelling. 6. Long-range correlation of plasma turbulence and interaction between edge and core transport. The choice of topics, and the amount of progress in the understanding of the complexity of transport barriers physics reflect the drive in the fusion community towards the preparation for the ITER tokamak operation. More than 100 scientists (including students) attended the three-day workshop, coming from all over the world to present their newest results, discuss with colleagues and enjoy the atmosphere of the beautiful Lady Margaret Hall. The preparation work of the International Advisory Committee (G. Saibene (EU - Chair), R. Groebner (US), T. S Hahm (KO), A. Hubbard (US), K. Ida (Japan), S. Lebedev (RF), N. Oyama (Japan), E Wolfrum (EU)) has been rewarded by the enthusiastic participation of scientists, experimentalist, modellers and theoreticians, and by the high level of the scientific discussion throughout the workshop, during lunch breaks and even at the conference dinner. The Committee is also grateful to EFDA for the support in the organization of the workshop and to the Local Organizing Committee (E

    4. EDITORIAL: CAMOP: Quantum Non-Stationary Systems CAMOP: Quantum Non-Stationary Systems

      NASA Astrophysics Data System (ADS)

      Dodonov, Victor V.; Man'ko, Margarita A.

      2010-09-01

      QED. Another rapidly growing research field (although its origin can be traced to the beginning of the 1980s) is the quantum control of evolution at the microscopic level. These examples show that quantum non-stationary systems continue to be a living and very interesting part of quantum physics, uniting researchers from many different areas. Thus it is no mere chance that several special scientific meetings devoted to these topics have been organized recently. One was the international seminar 'Time-Dependent Phenomena in Quantum Mechanics' organized by Manfred Kleber and Tobias Kramer in 2007 at Blaubeuren, Germany. The proceedings of that event were published in 2008 as volume 99 of Journal of Physics: Conference Series. Another recent meeting was the International Workshop on Quantum Non-Stationary Systems, held on 19-23 October 2009 at the International Center for Condensed Matter Physics (ICCMP) in Brasilia, Brazil. It was organized and directed by Victor Dodonov (Institute of Physics, University of Brasilia, Brazil), Vladimir Man'ko (P N Lebedev Physical Institute, Moscow, Russia) and Salomon Mizrahi (Physics Department, Federal University of Sao Carlos, Brazil). This event was accompanied by a satellite workshop 'Quantum Dynamics in Optics and Matter', organized by Salomon Mizrahi and Victor Dodonov on 25-26 October 2009 at the Physics Department of the Federal University of Sao Carlos, Brazil. These two workshops, supported by the Brazilian federal agencies CAPES and CNPq and the local agencies FAP-DF and FAPESP, were attended by more than 120 participants from 16 countries. Almost 50 invited talks and 20 poster presentations covered a wide area of research in quantum mechanics, quantum optics and quantum information. This special issue of CAMOP/Physica Scripta contains contributions presented by some invited speakers and participants of the workshop in Brasilia. Although they do not cover all of the wide spectrum of problems related to quantum non

    5. PREFACE Turbulent Mixing and Beyond

      NASA Astrophysics Data System (ADS)

      Abarzhi, Snezhana I.; Gauthier, Serge; Niemela, Joseph J.

      2010-12-01

      for Theoretical Physics, Russia) E Bodenschatz (Max Plank Institute for Dynamics and Self-Organization, Germany) F Cattaneo (University of Chicago, USA) P Cvitanović (Georgia Institute of Technology, USA) S Cowley (Imperial College, UK) S Dalziel (DAMTP, University of Cambridge, UK) W S Don (Brown University, USA) R Ecke (Los Alamos National Laboratory, USA) H J Fernando (Arizona State University, USA) I Foster (University of Chicago, USA) S Gauthier (Commissariat à l'Energie Atomique, France) G A Glatzmaier (University of California at Santa Cruz, USA) J Glimm (State University of New York at Stony Brook, USA) W A Goddard III (California Institute of Technology, USA) J Jimenez (Universidad Politecnica de Madrid, Spain) L P Kadanoff (The University of Chicago, USA) D Q Lamb (The University of Chicago, USA) D P Lathrop (University of Maryland, USA) S Lebedev (Imperial College, UK) P Manneville (École Polytechnique, France) D I Meiron (California Institute of Technology, USA) P Moin (Stanford University, USA) A Nepomnyashchy (Technion, Israel) J Niemela (International Center for Theoretical Physics, Italy) K Nishihara (Institute for Laser Engineering, Osaka, Japan) S S Orlov (Stanford University, USA) S A Orszag (Yale University, USA) E Ott (University of Maryland, USA) N Peters (RWTH Aachen University, Germany) S B Pope (Cornell, USA) A Pouquet (University Corporation for Atmospheric Research, USA) B A Remington (Lawrence Livermore National Laboratory, USA) R Rosner (Argonne National Laboratory and University of Chicago, USA) A J Schmitt (Naval Research Laboratory, USA) C -W Shu (Brown University, USA) K R Sreenivasan (International Centre for Theoretical Physics, Italy) E Tadmor (University of Maryland, USA) Y C F Thio (US Department of Energy) A L Velikovich (Naval Research Laboratory, USA) V Yakhot (Boston University, USA) P K Yeung (Georgia Institute of Technology, USA) F A Williams (University of California at San Diego, USA) E Zweibel (University of Wisconsin

    6. PREFACE: Particles and Fields: Classical and Quantum

      NASA Astrophysics Data System (ADS)

      Asorey, M.; Clemente-Gallardo, J.; Marmo, G.

      2007-07-01

      , Germany)

    M. Asorey (Universidad de Zaragoza, Spain)
    G. F. Dell Antonio (Universitá di Roma La Sapienza, Italy)
    A. Galindo (Universidad Complutense de Madrid, Spain)
    S. L. Glashow (Boston University, USA)
    A. M. Gleeson (University of Texas, Austin, USA)
    C. R. Hagen (Rochester University, NY, USA)
    J. Klauder (University of Florida, Gainesville, USA)
    A. Kossakowski (University of Torun, Poland)
    V.I. Manko (Lebedev Physical Institute, Moscow, Russia)
    G. Marmo (Universitá Federico II di Napoli e INFN Sezione di Napoli, Italy)
    N. Mukunda (Indian Institute of Science, Bangalore, India)
    J. V. Narlikar (Inter-University Centre for Astronomy and Astrophysics, Pune, India)
    J. Nilsson (University of Goteborg, Sweden)
    S. Okubo (Rochester University, NY, USA)
    T. Regge (Politecnico di Torino, Italy)
    W. Schleich (University of Ulm, Germany)
    M. Scully (Texas A& M University, USA)
    S. Weinberg (University of Texas, Austin, USA)

    Local Organizing Committee

    M. Asorey (Universidad de Zaragoza, Spain)
    L. J. Boya (Universidad de Zaragoza, Spain). Co-Chair
    J. F. Cariñena (Universidad de Zaragoza, Spain)
    J. Clemente-Gallardo (Universidad de Zaragoza, Spain)
    F. Falceto (Universidad de Zaragoza, Spain)
    G. Marmo (Universitá Federico II di Napoli e INFN Sezione di Napoli, Italy) Co-Chair
    G. Morandi (Universitá di Bologna, Italy)

    Participants

    ACHARYA, Raghunath: Arizona State University, USA
    AGUADO, Miguel M.: Max-Planck-Institut für Quantenoptik, Garching, Germany
    ASOREY, Manuel: Universidad de Zaragoza, Spain

  21. Geodynamic and Magmatic Evolution of the Eastern Anatolian-Arabian Collision Zone, Turkey

    NASA Astrophysics Data System (ADS)

    Keskin, Mehmet

    2014-05-01

    alkaline lavas in the region at around 10 Ma (e.g. tephrites and alkaline basalts in the N of Lake Van) can be interpreted as the indication of the formation of the slab-window beneath the region due to tearing of the slab. I also argue that spatial and temporal presence of a variable subduction signature can be linked to the persistent dehydration from the deep lying slab below the region. Melting models indicate that there is a temporal change in source characteristics across the collision zone from a garnet-dominated deeper mantle-source during the Miocene to a spinel-dominated shallower source during the Quaternary. I argue that this notable change can either be linked to the derivation of variable fractions of magmas from a newly formed lithospheric mantle by cooling of the asthenosphere along the contacts with the crust (i.e. reformation of lithospheric mantle), or to the mineral phase transformations in the mantle from garnet to spinel in response to decompression. AFC and EC-AFC models reveal that the importance of the AFC process decreased broadly in time while each volcano experienced a unique replenishment and fractionation history in the crustal magma chambers. REFERENCES Faccenna, C., Becker, T.W., Jolivet, L. and Keskin, M. (2013). Mantle convection in the Middle East: Reconciling Afar upwelling, Arabia indentation and Aegean trench rollback, Earth and Planetary Science Letters, 375, 254-269, doi: 10.1016/j.epsl.2013.05.043 Keskin, M. (2003).Magma generation by slab steepening and breakoff beneath a subduction-accretion complex: An alternative model for collision-related volcanism in Eastern Anatolia, Turkey, Geophysical Research Letters, 30(24). 8046, doi:10.1029/2003GL018019 Keskin M., Chugaev A.V., Lebedev V.A., Sharkov E.V., Oyan V. and Kavak O. (2012). The Geochronology and Origin of Mantle Sources for Late Cenozoic Intraplate Volcanism in the Frontal Part of the Arabian Plate in the Karacada Neovolcanic Area of Turkey. Part 2. The Results of Geochemical

  22. PREFACE: Turbulent Mixing and Beyond Turbulent Mixing and Beyond

    NASA Astrophysics Data System (ADS)

    Abarzhi, Snezhana I.; Gauthier, Serge; Rosner, Robert

    2008-10-01

    ) Institute for Laser Engineering (ILE), Osaka, Japan (Division Head: Dr K Nishihara) Illinois Institute of Technology (IIT), Chicago, USA (College of Science and Letters, Department of Applied Mathematics: Dr S I Abarji) and thanks them for making this event possible. The Organizing Committee appreciates the assistance of Suzie Radosic (administrator and assistant, ICTP) Daniil Ilyin (web-master, Chicago) Elena Magnus (assistant, Chicago) We express our gratitude for the help with the Conference Program to the members of the Scientific Advisory Committee S I Abarzhi (The University of Chicago, Illinois Institute of Technology, USA) G Ahlers (University of California at Santa Barbara, USA) M J Andrews (Los Alamos National Laboratory, Texas A & M University, USA) S I Anisimov (Landau Institute for Theoretical Physics, Russia) E Bodenschatz (Max Plank Institute, Gottingen, Germany) S Dalziel (DAMTP, University of Cambridge, UK) R Ecke (Los Alamos National Laboratory, USA) H J Fernando (Arizona State University, USA) S Gauthier (Commissariat à l'Energie Atomique, France) G A Glatzmaier (University of California at Santa Cruz, USA) W A Goddard III (California Institute of Technology, USA) L P Kadanoff (The University of Chicago, USA) D Q Lamb (The University of Chicago, USA) D P Lathrop (University of Maryland, USA) S Lebedev (Imperial College, UK) P Manneville (Ecole Polytechnique, France) D I Meiron (California Institute of Technology, USA) H Nagib (Illinois Institute of Technology, Chicago, USA) J Niemela (International Center for Theoretical Physics, Italy) K Nishihara (Institute for Laser Engineering, Osaka, Japan) S A Orszag (Yale University, USA) E Ott (University of Maryland, USA) N Peters (RWTS, Aachen, Germany) S B Pope (Cornell, USA) B A Remington (Lawrence Livermore National Laboratory, USA) R Rosner (Argonne National Laboratory and The University of Chicago, USA) A Schmidt (Naval Research Laboratory, USA) K R Sreenivasan (International Centre for Theoretical Physics

  23. 3rd International Conference on Turbulent Mixing and Beyond

    NASA Astrophysics Data System (ADS)

    Abarzhi, Snezhana I.; Gauthier, Serge; Keane, Christopher J.; Niemela, Joseph J.

    2013-07-01

    , USA) • J Glimm (State University of New York at Stony Brook, USA) • W A Goddard III (California Institute of Technology, USA) • F Grinstein (Los Alamos National Laboratory, USA) • J Jimenez (Universidad Politecnica de Madrid, Spain) • L P Kadanoff (The University of Chicago, USA) • D Q Lamb (The University of Chicago, USA) • D P Lathrop (University of Maryland, USA) • S Lebedev (Imperial College, UK) • P Manneville (Ecole Polytechnique, France) • D I Meiron (California Institute of Technology, USA) • P Moin (Stanford University, USA) • A Nepomnyashchy (Technion, Israel) • J Niemela (International Center for Theoretical Physics, Italy) • K Nishihara (Institute for Laser Engineering, Osaka, Japan) • S S Orlov (Physical Optics Corporation, USA) • N Peters (RWTS, Aachen, Germany) • S B Pope (Cornell, USA) • A Pouquet (University Corporation for Atmospheric Research, USA) • B A Remington (Lawrence Livermore National Laboratory, USA) • R R Rosales (Massachusetts Institute of Technology, USA) • R Rosner (Argonne National Laboratory and University of Chicago, USA) • A J Schmitt (Naval Research Laboratory, USA) • C-W Shu (Brown University, USA) • K R Sreenivasan (New York University, USA) • E Tadmor (University of Maryland, USA) • A L Velikovich (Naval Research Laboratory, USA) • V Yakhot (Boston University, USA) • P K Yeung (Georgia Institute of Technology, USA) • F A Williams (University of California at San Diego, USA) • E Zweibel (University of Wisconsin, USA) We deeply appreciate the work of the Members of Steering Committee for Financial Support: • Snezhana I Abarzhi (University of Chicago, USA) • Serge Gauthier (Commissariat à l'Energie Atomique, France) • Joseph J Niemela (International Centre for Theoretical Physics, Italy) • Walter Gekelman (University of California, Los Angeles, USA) We thank the members of the Committee for the award 'Turbulent Mixing and Beyond for Youth': • Boris Galperin