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  • 1
    Electronic Resource
    Electronic Resource
    An apparently normal γ -ray burst with an unusually low luminosity (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 430 (2004), S. 646-648 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Much of the progress in understanding γ-ray bursts (GRBs) has come from studies of distant events (redshift z ≈ 1). In the brightest GRBs, the γ-rays are so highly collimated that the events can be seen across the Universe. It has long been suspected that the nearest and most ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02748
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  • 2
    Electronic Resource
    Electronic Resource
    Review of GRANAT observations of gamma-ray bursts (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 31-34 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The GRANAT observatory was launched into a high apogee orbit on 1 December, 1989. Three instruments onboard GRANAT - PHEBUS, WATCH and SIGMA are able to detect gamma-ray bursts in a very broad energy range from 6 keV up to 100 MeV. Over 250 gamma-ray bursts were detected. We discuss the results of the observations of the time histories and spectral evolution of the detected events provided by the different instruments in different energy ranges. Short Gamma-Ray Bursts (〈 2 s) have 10 ms structure in their time histories. They have harder energy spectra than the long (〉 2 s) events. Evidence of the existence of four differently behaving componenents in gamma-ray burst spectra is discussed. Statistical properties of the gamma-ray burst sources based on the 5 years of observations with (∼ 10−6 erg/cm2) sensitivity as well as the results of high sensitivity (∼ 10−8 erg/cm2) search for Gamma-Ray Bursts within the SIGMA telescope field of view are reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658583
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  • 3
    Electronic Resource
    Electronic Resource
    Local density of states of GaAs and InAs surfaces: Ideal (111), (001) and (110) surfaces and monoatomic steps on the (111) and the (001) surface (1987)
    Springer
    Czechoslovak journal of physics 37 (1987), S. 862-880 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ideal (111), (001) and (110) surfaces of GaAs and InAs are investigated by means of the LCAO Green function recursion method to obtain local density of states. Main emphasis is laid on the analysis of the nature and character of the inherent surface states. For this purpose, several imperfections on the (111) and the (001) surface (i.e. vacancies and steps with varying topology) are treated to demonstrate the local character of Shockley surface states and to confirm their chemical nature. The applicability of the results obtained to other A3B5 compounds is discussed. Comparison with experiment and other theoretical investigations is also made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01604257
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  • 4
    Electronic Resource
    Electronic Resource
    Primary acoustic echo during excitation of a paramagnetic crystal by picosecond elastic video pulses (1999)
    Springer
    Physics of the solid state 41 (1999), S. 560-564 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The primary acoustic echo formed during excitation of a paramagnetic crystal with effective spin S=1 by two transverse picosecond elastic video pulses is investigated theoretically. Both exciting video pulses are applied perpendicular to the external magnetic field. It is shown that the primary acoustic echo in the general case consists of six longitudinal and transverse signals at the frequencies of the transitions within a Zeeman triplet. The optimal parameters of the exciting video pulses for the appearance of different echo signals are determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130824
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  • 5
    Electronic Resource
    Electronic Resource
    Charge properties of aluminum oxide layers synthesized by molecular layering (1998)
    Springer
    Technical physics letters 24 (1998), S. 525-526 
    Details
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An investigation was made of the charge and conducting properties of layers of insulator obtained by molecular layering in Si-Al2O3-Al structures. No charge trapping in the insulator is observed at 77 K when depleting voltages are applied to the structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1262179
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  • 6
    Electronic Resource
    Electronic Resource
    Coherent repopulation of hyperfine structure levels in the field of a bichromatic resonant radio-frequency wave (1997)
    Springer
    Journal of experimental and theoretical physics 84 (1997), S. 682-686 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We consider the resonant interaction between atoms with hyperfine energy levels and a bichromatic radio-frequency field. Nuclear Zeeman levels of an impurity center in a magnetic host form a structure of this kind. Using the spin-density-matrix formalism, we solve the problem of coherent repopulation of a system of three of these levels under the action of a bichromatic resonant radio-frequency wave, taking into account transverse relaxation, and note the connection between this effect and the well-known phenomenon of coherent population capture when a laser bichromatic field interacts resonantly with a three-level system. We discuss various possibilities for observation of this effect experimentally.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558201
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  • 7
    Electronic Resource
    Electronic Resource
    Self-induced transparency for ultrashort pulses propagating in a multilevel quantum medium (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 864-874 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study theoretically the phenomenon of self-induced transparency for ultrashort pulses (videopulses) propagating in a multilevel quantum medium under conditions in which the method of slowly varying amplitudes and phases breaks down and the pulse spectrum substantially overlaps the quantum transitions. A special class of transitions with one common level is considered. We find that the dynamics of the videopulses in such a medium is described by a double sine-Gordon equation. We establish the conditions under which steady-state traveling 0π-, 2π-, and 4π-videosolitons are formed. It is found that 4π-videosolitons can propagate both in equilibrium media and in some nonequilibrium media, while 0π-videosolitons can propagate only in nonequilibrium media. We study amplification processes in highly nonequilibrium systems and show that, depending on the initial state of the medium, 2π-and qπ-pulses (0〈q〈1) with increasing amplitudes may be formed. We conclude that the amplification of an ultrashort pulse occurs due to an increase in the photon number density and to an increase in the frequency of each photon. Finally, we study the possibility of an electromagnetic autosoliton being formed in a nonequilibrium dissipative medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558734
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  • 8
    Electronic Resource
    Electronic Resource
    Acoustic activity effect for picosecond soliton-like pulses (2000)
    Springer
    Journal of experimental and theoretical physics 91 (2000), S. 16-30 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A theoretical analysis is made of the acoustic activity for interfering picosecond acoustic soliton-like pulses of down to a single oscillation period. An analysis is made of the case where these pulses propagate parallel to an external magnetic field and one of the acoustic axes in a cubic crystal containing paramagnetic impurities having effective spin S = 1. Allowance is made for natural, magnetic (Faraday), and cross acoustic activity. This cross activity is caused by the significant spatial nonlocality of the spin-phonon interaction for such short pulses in crystals having no center of inversion in the presence of paramagnetic impurities. A system of nonlinear equations is obtained for the transverse and longitudinal components of the strain in the form of a coupling between the “differentiated” nonlinear Schrödinger equation (with nonlinearity after the derivative sign) and the Korteweg-de Vries equation which generalizes the known systems of long-short-wavelength resonance to the case where the slowly varying envelope approximation is not valid. An approximate solution of this system is used to study the structure of an elastic soliton-like pulse whose transverse component has a rotating plane of polarization, which propagates under conditions of nonlinear coupling with the longitudinal strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1307231
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  • 9
    Electronic Resource
    Electronic Resource
    Coherent repopulation of the components of a three-level quantum system in the field of a pulsed bichromatic radio frequency wave (1998)
    Springer
    Journal of experimental and theoretical physics 86 (1998), S. 644-649 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The coherent repopulation of a quantum system consisting of three nonequidistant levels in the field of a resonant bichromatic rf wave is studied. The atoms are assumed to have an impulsive interaction with the rf wave in which the pulse duration is less than any of the relaxation times. The hyperfine structure of gas atoms and a system of atomic oscillator levels in a magnetic trap are considered as examples of such a quantum system. It is shown that in the second case, the coherent repopulation effect can be used to cool neutral atoms in magnetic traps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558520
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  • 10
    Electronic Resource
    Electronic Resource
    Thermalization of neutrons on cold atoms in magnetic traps (1999)
    Springer
    JETP letters 70 (1999), S. 575-577 
    Details
    ISSN: 1090-6487
    Keywords: 28.20.Cz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new method is proposed for cooling polarized neutrons by thermalizing neutrons in spherical and torroidal magnetic traps with elastic triplet scattering by cold, double spin-polarized, hydrogen atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568217
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