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  • 1
    Electronic Resource
    Electronic Resource
    Tsunamis Generated by Subaquatic Volcanic Explosions: Unique Data from 1996 Eruption in Karymskoye Lake, Kamchatka, Russia (2000)
    Springer
    Pure and applied geophysics 157 (2000), S. 1135-1143 
    Details
    ISSN: 1420-9136
    Keywords: Key Words: Tsunami of volcanic origin, base surge, tsunami runup, underwater volcanic explosion, Karymskoye Lake, Kamchatka.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —The 1996 subaquatic explosive eruption near the northern shore of Karymskoye Lake in Kamchatka, Russia, generated multiple tsunamis. We document the explosive process that produced the tsunamis, and describe the tsunami effects and runup around the 4-km diameter lake. These data enable the determination of an attenuation relation of runup (wave) height for these “explosive” tsunamis, which is compared with theoretical models of wave height distributions. For the proximal zone, involving radial distances (r) up to 1.3 km from the source, the runup height (R) shows rapid attenuation (from 〉 30 m to 8 m) with distance as log R = −1.98 log[r] + 2.6. For the distal zone, r 〉 1.3 km, involving mainly wave travel southeastwards along the body of the lake away from the explosion source, R decays more slowly (from 8 m to 3 m) as log R = −0.56 log[r] + 1.9. Rapid decay in the proximal zone suggests that near the source of the explosion, the tsunami propagated radially as a collapsing wave (bore) with discontinuous change in height. The break-in-slope of the runup plot at 1.3 km suggests that beyond this distance the tsunami propagated approximately as a decaying one-dimensional wave in a channel of approximately constant width.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050021
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  • 2
    Electronic Resource
    Electronic Resource
    Order parameter quantum fluctuations in a two-dimensional system of mesoscopic Josephson junctions (1998)
    Springer
    Journal of experimental and theoretical physics 86 (1998), S. 146-155 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The boson lattice Hubbard model is used to study the role of quantum fluctuations of the phase and local density of the superfluid component in establishing a global superconducting state for a system of mesoscopic Josephson junctions or grains. The quantum Monte Carlo method is used to calculate the density of the superfluid component and fluctuations in the number of particles at sites of the two-dimensional lattice for various average site occupation numbers n 0 (i.e., number of Cooper pairs per grain). For a system of strongly interacting bosons, the phase boundary of the ordered superconducting state lies above the corresponding boundary for its quasiclassical limit—the quantum XY-model—and approaches the latter as n 0 increases. When the boson interaction is weak in the boson Hubbard model (i.e., the quantum fluctuations of the phase are small), the relative fluctuations of the order parameter modulus are significant when n 0〈10, while quantum fluctuations in the phase are significant when n 0〈8; this determines the region of mesoscopic behavior of the system. Comparison of the results of numerical modeling with theoretical calculations show that mean-field theory yields a qualitatively correct estimate of the difference between the phase diagrams of the quantum XY-model and the Hubbard model. For a quantitative estimate of this difference the free energy and thermodynamic averages of the Hubbard model are expanded in powers of 1/n 0 using the method of functional integration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558479
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  • 3
    Electronic Resource
    Electronic Resource
    Two-dimensional mesoscopic dusty plasma clusters: Structure and phase transitions (1999)
    Springer
    Journal of experimental and theoretical physics 89 (1999), S. 696-703 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A two-dimensional mesoscopic cluster of “dusty plasma” particles, which can be interpreted as a system of microparticles in an rf gas discharge, is investigated. The ground-state configurations and corresponding eigenfrequencies and eigenvectors are found for clusters of N=22–40 particles in a harmonic confining potential. It is shown that a change in the Debye screening length R of the particle charge in the plasma can cause structural transformations of the ground state of the system, manifested as first-order or second-order phase transitions with respect to the parameter R. The disorder (“melting”) of the clusters is analyzed in detail by Monte Carlo simulation and molecular dynamics. By varying the characteristic range of particle interaction in a cluster, it is possible to modulate its thermodynamic properties and the character of the phase transitions, thereby causing a controlled transition of the system into the fully ordered, orientationally disordered, or fully disordered state. The possibility of dusty plasma clusters coexisting in different states is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.559030
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of fluctuations of a classical exterior medium on tunneling nonradiative processes in molecules (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 1053-1057 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We examine nonradiative transitions in molecules with allowance for the effect of a classical polar exterior medium on tunneling charge transport. The approach allows for the vibrational frequencies of a molecule in the electron transition. In the case of slow fluctuations, the theory predicts a low-temperature (non-Arrhenius) increase in the tunneling nonradiative transition rate, and the results agree qualitatively with the experimental data. When the fluctuations of the exterior medium are rapid, at certain values of the molecular parameters the tunneling decay rate is found to decrease with increasing temperature because the conditions needed for resonant tunneling are violated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558620
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  • 5
    Electronic Resource
    Electronic Resource
    Quantum melting of mesoscopic clusters (1999)
    Springer
    Physics of the solid state 41 (1999), S. 1705-1710 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The phase diagram of a two-dimensional mesoscopic system of charges or dipoles, whose realizations could be electrons in a semiconductor quantum dot or indirect excitons in a system of two vertically coupled quantum dots, is investigated. Quantum calculations using ab initio Monte Carlo integration along trajectories determine the properties of such objects in the temperature-quantum de-Boer-parameter plane. At zero (sufficiently low) temperature, as the quantum fluctuations of the particles increase, two types of quantum disordering phenomena occur with increasing quantum de Boer parameter q: first, for q∼10−5 the systems transform into a radially ordered but orientationally disordered state wherein various shells of the “atom” rotate relative to one another. For much larger q∼0.1, a transition occurs to a disordered state (a superfluid in the case of a system of bosons).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131073
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  • 6
    Electronic Resource
    Electronic Resource
    New model for systems of mesoscopic Josephson junctions (1997)
    Springer
    JETP letters 66 (1997), S. 686-692 
    Details
    ISSN: 1090-6487
    Keywords: 73.23.Ps ; 74.50.+r ; 74.20.Mn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Quantum fluctuations of the phases of the order parameter in two-dimensional arrays of mesoscopic Josephson junctions and their effect on the destruction of superconductivity in the system are investigated by means of a quantum-cosine model that is free of the incorrect application of the phase operator. The proposed model employs trigonometric phase operators and makes it possible to study arrays of small superconducting granules, pores containing superfluid helium, or Josephson junctions in which the average number of particles n 0 (effective bosons, He atoms, and so on) is small, and the standard approach employing the phase operator and the particle number operator as conjugate operators is inapplicable. There is a large difference in the phase diagrams between arrays of macroscopic and mesoscopic objects for n 0〈5 and U〈J (U is the characteristic interaction energy of the particles per granule and J is the Josephson coupling constant). Re-entrant superconductivity phenomena are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567580
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  • 7
    Electronic Resource
    Electronic Resource
    Quantum orientational melting and the phase diagram of a mesoscopic system (1998)
    Springer
    JETP letters 68 (1998), S. 858-863 
    Details
    ISSN: 1090-6487
    Keywords: 73.23.−b ; 64.60.−i
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The “phase diagram” of a two-dimensional mesoscopic system of bosons is investigated. An example of such a system is a system of indirect magnetoexcitons in semiconductor double quantum dots. Quantum Monte Carlo calculations show the existence of quantum orientational melting. At zero (quite low) temperature, as quantum fluctuations of the particles intensify, two quantum disordering phenomena occur with increasing de Boer parameter q. First, at q≈10−3 the system passes to a radially ordered but orientationally disordered state, where different shells of a cluster rotate relative to one another. Then at q≈0.16 a transition to a superfluid state occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567805
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  • 8
    Electronic Resource
    Electronic Resource
    Quantum phase fluctuations in an array of mesoscopic Josephson junctions (1997)
    Springer
    Physics of the solid state 39 (1997), S. 1345-1351 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effects of macroscopic ordering in a system of mesoscopic Josephson junctions are investigated by the quantum Monte Carlo simulation technique (using path integrals). The phase diagram of the system in the T-q plane (q is the dimensionless quantum parameter $$q = 2{e \mathord{\left/ {\vphantom {e {\sqrt {JC_0 } }}} \right. \kern-\nulldelimiterspace} {\sqrt {JC_0 } }}$$ , where J is the Josephson coupling constant and C 0 is the self-capacitance of the granules) is investigated in detail. An analysis of the behavior of the relative root-mean-square phase shifts, as well as the helicity and vorticity moduli, demonstrates the need to employ these two quantities as the parameters which most completely reflect the character of the topological phase transition in the quantum system under consideration. Two methods are proposed for calculating the vorticity modulus: 1) a modification of the Gibbs-Bogolyubov variational principle for calculating the free energy change in response to alteration of the type of boundary conditions; 2) calculation of the response to the introduction of an infinitesimal magnetic flux at some point in the system. The calculations confirm the absence of reentrant melting and phase transitions of a non-Kosterlitz-Thouless type in the region of strong quantum phase fluctuations q〉1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130076
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  • 9
    Electronic Resource
    Electronic Resource
    Josephson array of mesoscopic objects. Modulation of system properties through the chemical potential (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 322-328 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The phase diagram of a two-dimensional Josephson array of mesoscopic objects (superconducting granules, superfluid helium in a porous medium, traps with Bose-condensed atoms, etc.) is examined. Quantum fluctuations in both the modulus and phase of the superconducting order parameter are taken into account within a lattice boson Hubbard model. Modulating the average occupation number n 0 of the sites in the system (the “number of Cooper pairs” per granule, the number of atoms in a trap, etc.) leads to changes in the state of the array, and the character of these changes depends significantly on the region of the phase diagram being examined. In the region where there are large quantum fluctuations in the phase of the superconducting order parameter, variation of the chemical potential causes oscillations with alternating superconducting (superfluid) and normal states of the array. On the other hand, in the region where the bosons interact weakly, the properties of the system depend monotonically on n 0. Lowering the temperature and increasing the particle interaction force lead to a reduction in the width of the region of variation in n 0 within which the system properties depend weakly on the average occupation number. The phase diagram of the array is obtained by mapping this quantum system onto a classical two-dimensional XY model with a renormalized Josephson coupling constant and is consistent with our quantum path-integral Monte Carlo calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558662
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  • 10
    Electronic Resource
    Electronic Resource
    Impact excitation of squeezed vibrational packets in molecules (1998)
    Springer
    Technical physics letters 24 (1998), S. 513-514 
    Details
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An analysis is made of vibrational packets created in molecules by collisions with fast protons. Some characteristic features of the Raman light scattering spectrum are discussed for a molecule with squeezed vibrational states. It is suggested that squeezed vibrational states in the ground electronic state of a molecule may be used for isotope separation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1262174
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