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  • 1975-1979  (3)
  • 1930-1934  (10)
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  • 1
    Electronic Resource
    Electronic Resource
    DYNAMIC DISAGGREGATE CHOICE MODELS, WITH AN APPLICATION IN TRANSPORTATION (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Decision sciences 10 (1979), S. 0 
    Details
    ISSN: 1540-5915
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: A standard assumption of disaggregate mode-choice models is that an individual faced with a choice among several available alternative transportation modes compares their utilities. These utilities are almost always expressed as a linear composite measure of various perceived benefits which are assumed constant. However, the individual's perceptions change as he learns, acquires new habits, or adapts to different physical, economic, and social circumstances. In order to account for these changes, two dynamic models of model-choice behavior are developed herein. These two models are based on two common postulates. (1) One alternative is preferred over another only if the absolute difference in their utilities exceeds a positive constant; otherwise, the decision maker is indifferent toward the two alternatives. (2) If an alternative is preferred, it will be chosen with certainty.In the indifference state, the individual is postulated to randomly choose one of the two alternatives (Model 1) or choose the same alternative as was most recently chosen (Model 2). Choice probabilities derived from these two models are shown to differ from those obtained using the conventional logit model. If there is a strong loyalty toward a mode, the logit model underestimates its choice probability when that mode is less attractive than the competing mode. The results are illustrated using numerical examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-5915.1979.tb00020.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Pleochroism and Crystal Structure. (1930)
    [s.l.] : Nature Publishing Group
    Nature 126 (1930), S. 12-12 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN a very important paper (Phil. Mag., vol. 33, p. 521 ; 1917), Silberstein developed a theory of molecular refractivity based on the idea that the electric doublets induced by the field of the light wave in the atoms composing the molecule influence each other, the result of such atomic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/126012a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A methodology for planning bus service (1977)
    Springer
    Transportation 6 (1977), S. 249-263 
    Details
    ISSN: 1572-9435
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract A methodology to assist transportation planners in designing bus services is developed. The methodology is most relevant for use in locations where bus service of the type being studied does not currently exist and therefore no information is available on past choice behavior, or in instances when transferability of travel models estimated in another location is difficult. The methodology assesses the sensitivity of bus service characteristics upon intended bus usage using survey data collected in Orange County, California, by the Orange County Transit District (OCTD). The methodology is based on a nonparametric statistical test developed by Kolmogorov and Smirnov. Scenarios describing hypothetical operations of bus service are presented to survey respondents who indicate their intended levels of bus usage under each situation. Significant differences between the response distributions associated with pairs of scenarios are identified and potential ridership levels, as bus operations become more favorable, are assessed. Various user segments are then identified on the basis of their levels of intended bus usage and the corresponding marketing implications associated with each segment are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00177454
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Crystal Structure of 1, 3, 5-Triphenylbenzene (1934)
    [s.l.] : Nature Publishing Group
    Nature 133 (1934), S. 497-497 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN a recent communication on the crystal structure of 1, 3, 5-triphenylbenzene, Dr. Kathleen Lonsdale1 discusses the results of recent X-ray measurements on the crystal and concludes that the planes of the benzene rings of the molecules cannot coincide with the (001) plane of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/133497a0
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular Orientations in p -Diphenylbenzene Crystal (1933)
    [s.l.] : Nature Publishing Group
    Nature 132 (1933), S. 968-969 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN recent papers1 we have shown how a correlation of the principal diamagnetic susceptibilities of an organic crystal with those for the molecules of the substance, offers a convenient method for determining the orientations of the molecules in the crystal lattice. The crystal of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/132968c0
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Pleochroism and Birefringence in Crystals (1933)
    [s.l.] : Nature Publishing Group
    Nature 132 (1933), S. 411-411 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] PROF. W. L. BRAGG1 explains the strong birefringence of some carbonates and nitrates as being due to the interaction of the optical dipoles induced in the component atoms. For example, X-ray analysis shows that the carbonate ions in calcite have a plane structure, their planes ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/132411a0
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Orientations of Molecules in the p -Benzoquinone Crystal (1933)
    [s.l.] : Nature Publishing Group
    Nature 131 (1933), S. 653-654 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE crystal structure of p-benzoquinone has recently been studied by W. A. Caspari1 by X-ray methods. The crystal belongs to the monoclinic system and is assigned by Caspari to the space-group C52h; there are two molecules in the unit cell, the molecules ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/131653a0
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Negative Polarisation in Fluorescence (1933)
    [s.l.] : Nature Publishing Group
    Nature 131 (1933), S. 204-205 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN an important paper1 Wawilow has reported measurements on the polarisation of fluorescence of solutions of some dye-stuffs in glycerine, when excited by radiations of different wave-lengths. Using for excitation the radiations from a mercury lamp, isolated by a quartz ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/131204b0
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic Anisotropy of Graphite (1934)
    [s.l.] : Nature Publishing Group
    Nature 133 (1934), S. 174-175 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] GRAPHITE is known from the investigations of Owen, Honda and others to exhibit an exceptionally large magnetic anisotropy. The susceptibilities of the natural crystal along its hexagonal axis and along perpendicular directions are, according to Honda1: ... respectively, per ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/133174c0
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic Constants of Benzene, Naphthalene and Anthracene Molecules (1932)
    [s.l.] : Nature Publishing Group
    Nature 130 (1932), S. 698-699 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN a recent communication1, I have shown how, by a correlation of the principal susceptibilities of a diamagnetic crystal, with those of the constituent molecules, it is possible to determine the orientations of the molecules in the crystal. Conversely, where the orientations are ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/130698b0
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    Paper (German National Licenses)
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