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  • 2000-2004  (12)
  • 1980-1984  (53)
  • 1970-1974  (39)
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  • 1
    Digitale Medien
    Digitale Medien
    Relaxation spectra in poly(methylmethacrylate): Comparison of acoustic attenuation and light scattering data (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 10189-10195 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Relaxation processes in polymethylmethacrylate were investigated using light scattering and mechanical relaxation techniques. The acoustic attenuation data cover the frequency range from 1 Hz to 17 GHz and the light scattering from 0.5 to 10 000 GHz. Analysis of the data in a broad temperature range (80–350 K) shows that the model of the asymmetric double-well potentials, traditionally used for description of the acoustic attenuation in glasses, cannot describe all the data consistently. It is shown that assuming an additional relaxation in GHz region with a constant loss spectrum provides a good agreement of the model with experimental data. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1370392
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  • 2
    Digitale Medien
    Digitale Medien
    Characterization of the native Cr2O3 oxide surface of CrO2 (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 3122-3124 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Using photoemission and inverse photoemission, we have been able to characterize the Cr2O3 oxide surface of CrO2 thin films. The Cr2O3 surface oxide exhibits a band gap of about 3 eV, although the bulk CrO2 is conducting. The thickness of this insulating Cr2O3 layer is twice the photoelectron escape depth which is about 2 nm thick. The effective Cr2O3 surface layer Debye temperature, describing motion normal to the surface, is about 370 K. From a comparison of CrO2 films grown by different techniques, with different Cr2O3 content, evidence is provided that the CrO2 may polarize the Cr2O3. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1416474
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  • 3
    Digitale Medien
    Digitale Medien
    Poisson's ratio and the fragility of glass-forming liquids (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 431 (2004), S. 961-963 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The nature of the transformation by which a supercooled liquid ‘freezes’ to a glass—the glass transition—is a central issue in condensed matter physics but also affects many other fields, including biology. Substantial progress has been made in understanding this ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/nature02947
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  • 4
    Digitale Medien
    Digitale Medien
    Critical behavior of frustrated systems: Monte Carlo simulations versus renormalization group (2000)
    Springer
    JETP letters 72 (2000), S. 337-340 
    Details
    ISSN: 1090-6487
    Schlagwort(e): 75.10.−b ; 64.60.Ak ; 64.60.Cn ; 05.10.Ln
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We study the critical behavior of frustrated systems by means of the Padé-Borel resummed three-loop renormalization group expansions and numerical Monte Carlo simulations. Amazingly, for six-component spins, where the transition is second-order, both approaches disagree. This unusual situation is analyzed both from the point of view of the convergence of the resummed series and from the possible relevance of nonperturbative effects.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.1328451
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  • 5
    Digitale Medien
    Digitale Medien
    Dineutron configurations in neutron-excess nuclei from the viewpoint of the diffraction model (2000)
    Springer
    Physics of atomic nuclei 63 (2000), S. 1724-1731 
    Details
    ISSN: 1063-7788
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Cross sections measured for the interactions of incident neutron-excess nuclei 6He and 11Li with other nuclei are analyzed in terms of expressions obtained for relevant integrated cross sections within the diffraction approximation. The results of this analysis suggest that there exists a dineutron configuration in the 6He nucleus and that there is no such configuration in the 11Li nucleus. On the basis of calculations performed for various observables, some new specific experiments are proposed for discovering dineutrons more reliably in nuclei having a neutron halo.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.1320141
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  • 6
    Digitale Medien
    Digitale Medien
    Critical thermodynamics of two-dimensional systems in the five-loop renormalization-group approximation (2000)
    Springer
    Physics of the solid state 42 (2000), S. 2151-2158 
    Details
    ISSN: 1063-7834
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The paper is devoted to the calculation of renormalization-group (RG) functions in the O(n)-symmetry two-dimensional model of the λϕ 4 type in the five-loop approximation and to an analysis of the critical behavior of systems described by this model. Five-loop expansions for the β function and the critical indices are determined in bulk theory. They are summed up using the Padé-Borel and Padé-Borel-Le Roy methods, making it possible to optimize the summation procedure and to estimate the accuracy of the obtained numerical values. It is shown that in the Ising (n=1) case, as well as in other cases, the inclusion of the five-loop contribution to the β function displaces the coordinate of the Wilson fixed point only insignificantly, leaving it outside the interval formed by the results of computations on lattices; even “spreads” of the error in the renormalization group and lattice estimates do not overlap. This discrepancy is attributed to the effect of the nonanalytic com-ponent of the β function, which cannot be determined in perturbation theory. A computation of critical indices proves that, although the inclusion of the five-loop terms in the corresponding RG expansion slightly improves the concordance with the exact results, the nonanalytic contributions are apparently also significant in this case.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.1324056
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  • 7
    Digitale Medien
    Digitale Medien
    Critical exponents for a three-dimensional impure Ising model in the five-loop approximation (2000)
    Springer
    JETP letters 71 (2000), S. 412-416 
    Details
    ISSN: 1090-6487
    Schlagwort(e): 75.10.Hk ; 75.40.Cx ; 05.50.+q ; 05.70.Jk
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The renormalization-group functions governing the critical behavior of the three-dimensional weakly-disordered Ising model are calculated in the five-loop approximation. The random fixed point location and critical exponents for impure Ising systems are estimated by means of the Padé-Borel-Leroy resummation of the renormalization-group expansions derived. The asymptotic critical exponents are found to be γ=1.325 ± 0.003, η=0.025 ± 0.01, ν= 0.671 ± 0.005, α=−0.0125 ± 0.008, β=0.344 ± 0.006, while for the correction-to-scaling exponent, a less accurate estimate ω=0.32 ± 0.06 is obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.568366
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  • 8
    Digitale Medien
    Digitale Medien
    Magnetic phase diagram of the intermetallic compounds Gd1−x LaxMn2Ge2 and the effect of a field on transitions of the Mn subsystem from the antiferromagnetic into the ferromagnetic state (2000)
    Springer
    Journal of experimental and theoretical physics 90 (2000), S. 979-986 
    Details
    ISSN: 1090-6509
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The magnetic properties of the intermetallic compounds Gd1−x LaxMn2Ge2 (layered tetragonal crystal structure of the type ThCr2Si2), investigated in the present work and in [1] A. Sokolov, et al., Sol. State Commun. 105, 289 (1998), are discussed. It is shown that the basic characteristics of the magnetic ordering of these compounds—magnetic phase transitions from the ferrimagnetic into the antiferromagnetic state and vice versa—observed with increasing temperature in compositions with x 〈 0.1, the effect of a magnetic field on these transitions, the temperature dependences of the magnetization of these intermetallic compounds, as well as their magnetic T-x diagram can be described quantitatively in the Yafet-Kittel model for ferrimagnets with a negative exchange interaction in one of the sublattices using parameters determined in [2] A. Yu. Sokolov et al., JETP 89, 723 (1999) from investigations of the system Gd1−x YxMn2Ge2, taking into account the dependence of the interplanar exchange interaction Mn-Mn on the crystal lattice parameter a.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.559186
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  • 9
    Digitale Medien
    Digitale Medien
    Pneumatic device for measuring soil pressures (1973)
    Springer
    Power technology and engineering 7 (1973), S. 375-377 
    Details
    ISSN: 1570-1468
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Conclusions 1. In comparison with other cells based on pneumatic measuring methods [5], the cell here described has a more rigid membrane and a thickened central portion: this reduces the distortions introduced by the cell in the stress state of the soil. 2. The cell construction ensures parallel displacement of the nozzle during its regulation; this reduces the possibility of accidental errors and facilitates the establishment of the zero reading on the scale. 3. The measuring system ensures a sufficiently high sensitivity of the device. 4. The device is practically insensitive to temperature variations, unlike most cells based on electrical measuring methods. 5. The manufacturing techniques for the cells are very simple. These cells can be used for laboratory investigations of structures interacting with the soil under static loading conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02378589
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  • 10
    Digitale Medien
    Digitale Medien
    Polarization aberrations of laser radiation (2000)
    Springer
    Optics and spectroscopy 89 (2000), S. 469-475 
    Details
    ISSN: 1562-6911
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Polarization aberrations (PAs) of laser radiation, defined as distortions of the wave-polarization characteristics, are considered within the framework of wave theory. The parameters describing these aberrations are introduced. It is established that PAs already appear in the paraxial region. PAs of a thin lens are calculated using the method of wave-polarization matrices. It is shown that, under certain conditions, the polarization state is modified at the axis of the laser beam.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.1310718
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