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  • American Institute of Physics (AIP)  (35)
  • International Union of Crystallography (IUCr)  (6)
  • 1990-1994  (41)
  • 1935-1939
  • 11
    Digitale Medien
    Digitale Medien
    Propagation along a dielectric-coated cylinder immersed in a magnetoplasma (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 1931-1933 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: This communication presents a study of the dispersion relation for propagation in axisymmetric transverse magnetic modes along a dielectric-coated conducting cylinder embedded in a strongly magnetized plasma, the cylinder axis being placed parallel to the static magnetic field. Dispersion characteristics, covering all possible values of the plasma frequency, are plotted for typical values of εd and a/b, where εd is the dielectric constant of the coating, and a and b are the radii of the cylinder without and with the coating, respectively. A discussion of how the characteristics would change if εd or a/b is varied is also presented. In particular, the special case in which εd =1 and the coating is replaced by a vacuum sheath is investigated in detail.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.346589
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  • 12
    Digitale Medien
    Digitale Medien
    On the diffusivity-mobility ratio in small-gap semiconductors in the presence of a strong magnetic field: Theory and suggestion for experimental determination (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4309-4316 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An attempt is made to study the Einstein relation for the diffusivity-mobility ratio of the electrons in degenerate n-type small-gap semiconductors under strong magnetic field on the basis of three-band Kane model without any approximations of band parameters and incorporating the electron spin and broadening of Landau levels, respectively. It is found, taking n-Hg1−xCdxTe as an example, that the Einstein relation exhibits an oscillatory magnetic field dependence due to Shubnikov–de Haas effect and decreases with increasing alloy composition. Besides the same ratio increases with increasing electron concentration and is in close agreement with the suggested experimental method of determining the Einstein relation in degenerate semiconductors having arbitrary dispersion laws. In addition, the corresponding well-known results of parabolic semiconductors both in the presence and absence of magnetic field have been obtained from the generalized expressions under certain limiting conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.349109
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  • 13
    Digitale Medien
    Digitale Medien
    On the coupling of blast wave theory with atomic excitation in low-energy laser-induced plasmas formed in gases (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 3809-3813 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Time-dependent intensities of the spectral lines emitted by laser-induced plasmas generated in several gases are presented. The time-resolved and spatially varying intensities of two once-ionized nitrogen lines were used to calculate radial temperature distribution of temperature within the plasma. A modified blast wave theory, in which ionization was included through the Saha equation and the equation of conservation of charge, was used to calculate time-dependent intensities of several spectral lines of C, N, He, and Ar. The temporal profiles of the spectral lines appear to be dependent on the ionization potentials of the species in the plasma.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.346285
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  • 14
    Digitale Medien
    Digitale Medien
    Use of methane in an electron cyclotron resonance plasma source for carbon delta-doping in GaAs molecular beam epitaxy (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1494-1496 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An electron cyclotron resonance (ECR) plasma source has been used with methane gas to perform carbon delta-doping in GaAs grown by molecular beam epitaxy (MBE). The ECR plasma source is installed on a chemical vapor deposition chamber which is vacuum connected to a conventional MBE apparatus. Good surface morphologies, high sheet carrier densities (1–7×1012 cm−2), and reasonable hole mobilities (75–110 cm2/V s) are obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.105182
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  • 15
    Digitale Medien
    Digitale Medien
    Path integral description of polymers using fractional Brownian walks (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 9230-9236 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The statistical properties of fractional Brownian walks are used to construct a path integral representation of the conformations of polymers with different degrees of bond correlation. We specifically derive an expression for the distribution function of the chains' end-to-end distance, and evaluate it by several independent methods, including direct evaluation of the discrete limit of the path integral, decomposition into normal modes, and solution of a partial differential equation. The distribution function is found to be Gaussian in the spatial coordinates of the monomer positions, as in the random walk description of the chain, but the contour variables, which specify the location of the monomer along the chain backbone, now depend on an index h, the degree of correlation of the fractional Brownian walk. The special case of h=1/2 corresponds to the random walk. In constructing the normal mode picture of the chain, we conjecture the existence of a theorem regarding the zeros of the Bessel function.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.465539
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  • 16
    Digitale Medien
    Digitale Medien
    Molecular dynamics simulation of a dense model bilayer of chain molecules with fixed head groups (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 5377-5386 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Molecular dynamics (MD) simulations have been performed on a model bilayer of 48 chain molecules with fixed head groups and periodic boundary conditions in the lateral direction. The effects of packing density and temperature on the extent of spatial and temporal correlations in the ensemble have been studied by analyzing the trajectories from the MD simulations. Quantities such as order parameters, number density contours, trans–gauche statistics and structure factors are evaluated as a function of distance from the plane containing the constrained head groups. The ensemble having the smallest area of 20.625 A(ring)2/molecule can be characterized as having three dimensional order, even at high temperatures, with a few gauche defects. Decreasing the packing density of the chains results in the increase of the number of gauche defects, especially at the chain extremities along with a decrease in the extent of spatial and temporal correlations. Interestingly, shorter interchain spacings are evident in the middle of the layer which can be attributed to clusters of chains lying alongside less dense domains. At temperatures lower than 300 K, the ensemble having the largest area of 26.125 A(ring)2/molecule reveals a rather complex interplay between chains wherein the lateral arrangement of the methylene units across the layer is transient and varies as a function of distance from the plane of the head groups. At temperatures higher than 300 K, thermal motion increases chain separation which effectively suppresses cluster formation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.461653
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  • 17
    Digitale Medien
    Digitale Medien
    Thermodynamic properties of fluid helium at high pressures determined from speeds of sound (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 6163-6166 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The equation of state and heat capacity of fluid helium have been determined at temperatures from 98.15 to 298.15 K and at pressures from 100 to 1000 MPa using a new computational method. This is based on stepwise construction of ρT isobars starting from an experimental reference pρ isotherm and using the previously reported sound speed data of helium as a function of pressure and temperature. In the region of overlap, the calculated equation-of-state data show significant discrepancies from those obtained previously with direct measurements.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.462659
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  • 18
    Digitale Medien
    Digitale Medien
    Determination of the equation of state and heat capacity of argon at high pressures from speed-of-sound data (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 2130-2135 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: A method is developed for the simultaneous determination of the equation of state and heat capacity of a gas over a wide range of pressure and temperature. This is based on stepwise construction of pT isochores starting from one experimental reference pV isotherm and using speed-of-sound data of the gas as a function of pressure and temperature. The application of the method is illustrated by computing the density and heat capacity of argon at temperatures from 148.15 to 298.15 K and at pressures from 100 to 1000 MPa. In the region of overlap, the calculated densities are found to be in good agreement with those obtained previously from direct measurements.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.459936
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  • 19
    Digitale Medien
    Digitale Medien
    Stochastic quantization of para-Fermi fields (1990)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 31 (1990), S. 156-163 
    Details
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Notizen: The application of the method of stochastic quantization originally attributed to Parisi and Wu has been extended to spinor fields obeying para-Fermi statistics. The connection between Euclidean and stochastic field theories is established in the conventional manner by proving the equivalence between a Langevin equation satisfied by para-Grassmann fields and a Fokker–Planck equation, the Hamiltonian of which has been constructed using para-Grassmann variables analogous to its construction from Grassmann variables in the Fermi case. As an example, a two-point Green function is calculated for any arbitrary value of order p of para-Fermi statistics, barring the pathological case p=2 which has been mentioned briefly.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.528854
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  • 20
    Digitale Medien
    Digitale Medien
    Modified stepwise expansion method for the measurement of compressibility isotherms of gases up to 10 kbar (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1153-1154 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The stepwise expansion method for the measurement of compressibility isotherms of gases, developed recently in this laboratory, has been modified in order to measure those gases for which only low-pressure fiducial density data are available. The modified method has been tested with CH4 as a measuring gas at 298.15 K and up to 9.9 kbar.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1141440
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