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  • 1985-1989  (355)
  • 1945-1949  (12)
  • 1930-1934
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  • 1
    Digitale Medien
    Digitale Medien
    RESIDENTIAL MOBILITY AND NEIGHBORHOOD QUALITY (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of regional science 26 (1986), S. 0 
    Details
    ISSN: 1467-9787
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geographie , Wirtschaftswissenschaften
    Notizen: . This paper presents evidence on the factors causing residential mobility within inner-city neighborhoods. A theoretical model is presented which posits that intraurban mobility is a response to housing consumption disequilibrium. Our data and methodology permitted more accurate measurement of disequilibrium than in previous studies, including the disequilibrium arising from neighborhood change. The major conclusion we draw from our results is that households' perceptions of the level of neighborhood quality and its change influence the mobility decisions of both renters and homeowners residing within central cities. Also, in comparison to other measured factors, neighborhood variables were found to be strong mobility predictors regardless of housing tenure. Our results imply that neighborhood improvement policies may succeed in stabilizing inner-city neighborhoods.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1467-9787.1986.tb00828.x
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  • 2
    Digitale Medien
    Digitale Medien
    Macromolecular diffusion and the autoadhesion of polybutadiene (1985)
    s.l. : American Chemical Society
    Macromolecules 18 (1985), S. 1310-1314 
    Details
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ma00148a046
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  • 3
    Digitale Medien
    Digitale Medien
    Statistical thermodynamic theory of the collapse transition of thermotropic, main-chain mesogenic polymer molecules in infinitely dilute solution (1986)
    s.l. : American Chemical Society
    Macromolecules 19 (1986), S. 89-97 
    Details
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ma00155a016
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  • 4
    Digitale Medien
    Digitale Medien
    A statistical thermodynamic theory of thermotropic linear main-chain polymeric liquid crystals (1986)
    s.l. : American Chemical Society
    Macromolecules 19 (1986), S. 2329-2341 
    Details
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ma00163a002
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  • 5
    Digitale Medien
    Digitale Medien
    Maximum liquid-to-wall mass transfer in fluidized beds: energetic aspects (1985)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 24 (1985), S. 888-889 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/i200030a062
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  • 6
    Digitale Medien
    Digitale Medien
    Interaction potentials for alkali ion–rare gas and halogen ion–rare gas systems (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 6290-6302 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The Tang–Toennies model [J. Chem. Phys. 80, 3725 (1984)] has been modified to predict the potentials for ion–atom systems. First order SCF energies are used to describe the repulsive potential. The long range second order induction and dispersion potential terms up to R−10 are either taken from ab initio calculations or estimated and each term is appropriately damped. The potentials for Li+, Na+, K+, F−, and Cl− interacting with He, Ne, and Ar are found to agree well with both theoretical and experimental data within the expected errors. For comparison with the model new ab initio calculations have been performed for Na+–Ar and the results are in excellent agreement with the model predictions (〈10%).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.454467
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  • 7
    Digitale Medien
    Digitale Medien
    A method of calculating electron correlations for large molecules involving C, N, and H atoms (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 5183-5193 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: A way of calculating the electron correlation energy for the ground state of large organic molecules is presented. It is demonstrated that various contributions to the correlation energy may be described by simple analytic expressions. In the case of interatomic correlations, they depend only on the bond length, its kind (e.g., σ or π bond) and the atoms involved in the bonding. Intraatomic correlations for a given atom are shown to be determined by its total charge and the fraction of p electrons. The method is developed by starting from semiempirical (self-consistent field) calculations and building correlations into it. It is straightforward and simple to apply. Moreover, it provides considerable physical insight into the phenomenon of electron correlations. A number of tests of its accuracy are presented by considering small molecules for which a comparison with other calculations can be made. An overall satisfactory agreement is found.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.451857
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  • 8
    Digitale Medien
    Digitale Medien
    The temperature dependence of the direct current electrical conductivity in quasi-one-dimensional organic metals (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 4961-4973 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The dc electrical conductivity above the Peierls-transition temperature Tc of quasi-one-dimensional (1D) organic metals is calculated by an ab initio single-particle theory based on the Kubo–Mori formalism. The respective inverse relaxation time in this approach is calculated numerically. The theory allows for a reliable reproduction of experimentally derived normalized conductivity curves of highly anisotropic organic metals. The applicability of the model is reduced with decreasing anisotropy. Phenomenologically it can be shown that a T−2 law of decay of the dc electrical conductivity above Tc is conventionally connected with large anisotropies. Decreasing anisotropy leads to T−n curves, where n is sizeably smaller than 2. The theoretical approach reproduces a T−n, n≈2, law of decay in the framework of one-phonon electron scattering processes. Therefore it is suggested that the deviations from the T−1 behavior of conventional three-dimensional metals is caused by the strong Kohn anomaly in 1D systems. The influence of the electron–phonon coupling and the Debye temperature on the analytic structure of the normalized dc electrical conductivity curves has been studied. A general theoretical description is suggested to account for the influence of electronic correlations on the magnitude of the electron–phonon coupling as well as on the Peierls-transition temperature. It is shown qualitatively that the organic metals belong to a class of valence fluctuating systems where charge fluctuations are conserved also in the limit of strong electronic correlations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.456737
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  • 9
    Digitale Medien
    Digitale Medien
    Path integration over compact and noncompact rotation groups (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 1978-1994 
    Details
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Notizen: Applications of group theoretical methods in the path integral formalism of nonrelativistic quantum theory are considered. Analysis of the symmetry of the Lagrangian leads to the expansion of the short time propagator in matrix elements of unitary irreducible representations of the symmetry group. Identification of the coordinates with the group parameters transforms the path integral to integrals over the group manifold. The integration is performed using the orthogonality of the representations. Compact and noncompact rotation groups are considered, where the corresponding path integral is embedded in Euclidean and pseudo-Euclidean spaces, respectively. The unit sphere and unit hyperboloid may either be viewed as the group manifold itself or at least as a group quotient. In the first case Fourier analysis leads to an expansion in group characters. In the second case an expansion in zonal spherical functions is obtained. As examples the groups SO(n), SU(2), SO(n−1,1), and SU(1,1) are explicitly discussed. The path integral on SO(n+m) and SO(n,m) in bispherical coordinates is also treated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.527460
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  • 10
    Digitale Medien
    Digitale Medien
    Path integration over the n-dimensional Euclidean group (1989)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 30 (1989), S. 1195-1197 
    Details
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Notizen: The path integral for the n-dimensional free particle is considered. According to the underlying symmetry, the short time propagator is expanded in zonal spherical functions of the Euclidean group G=T n (large-closed-square) SO(n) with respect to the subgroup H=SO(n). The group theoretical approach to path integration, including the radial part, is explicitly demonstrated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.528599
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