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  • 1975-1979  (3)
  • 1970-1974  (6)
  • 1930-1934  (10)
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  • 1
    Electronic Resource
    Electronic Resource
    Vibrational spectra of liquid crystals. III. Raman spectra of crystal, cholesteric, and isotropic cholesterol esters, 2800-3100-cm-1region (1971)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 93 (1971), S. 5998-6004 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00752a008
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    EVALUATION OF METHODS FOR ESTIMATING STREAM WATER QUALITY PARAMETERS IN A TRANSIENT MODEL FROM STOCHASTIC DATA (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 10 (1974), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : In this study the estimation of parameters in water quality models represented by linear first order partial differential equations is investigated. Two sets of simulated input-output data, one with input noise and the other with output measurement error, were used. The parameters were estimated by a gradient technique (Bard's method) and a pattern search technique. The results indicate that the output measurement error significantly affects the values of parameter estimates as compared to the noise added to the input. Bard's method consistently gave results with a smaller sum of square value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1974.tb00612.x
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    Paper (German National Licenses)
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    SUPPLEMENTATION OF MISSING VALUES IN WATER QUALITY DATA (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 9 (1973), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: The problem of estimating missing values in water quality data using linear interpolation and harmonic analysis is studied to see which one of these two methods yields better estimates for the missing values. The data used in this study consisted of midnight values of dissolved oxygen from the Ohio River collected over a period of one year at Stratton station. Various hypothetical cases of missing data are considered and the two methods of supplementing missing values are evaluated using statistical tests. The results indicate that when the percentage of missed data points exceeded ten percent of the total number in the original sample, harmonic analysis usually yielded better estimates for both the regularly and irregularly missed cases. For data that exhibit cyclic variation, examples of which are dissolved oxygen concentration and water temperature, harmonic analysis as a data generation technique appears to be superior to linear interpolation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1973.tb01760.x
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    Paper (German National Licenses)
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  • 5
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    Unknown
    Selection of Undergraduate Freshmen Using Discriminant Analysis (1973)
    Washington D.C., Wash. : Periodicals Archive Online (PAO)
    The Journal of Experimental Education. 41:3 (1973:Spring) 28 
    Details
    ISSN: 0022-0973
    Topics: Education
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:h101-1973-041-03-000006
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    Paper (German National Licenses)
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  • 6
    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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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    “Convertibility of surds and sonants” — historical evidence (1972)
    Springer
    Indo-Iranian journal 14 (1972), S. 239-246 
    Details
    ISSN: 1572-8536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Linguistics and Literary Studies , Theology and Religious Studies
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01880994
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    Paper (German National Licenses)
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  • 9
    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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    Paper (German National Licenses)
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  • 10
    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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