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  • 1
    Digitale Medien
    Digitale Medien
    Toward automated assignment of nuclear magnetic resonance spectra: pattern recognition in two-dimensional correlation spectra (1985)
    s.l. : American Chemical Society
    Analytical chemistry 57 (1985), S. 2510-2516 
    Details
    ISSN: 1520-6882
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ac00290a018
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  • 2
    Digitale Medien
    Digitale Medien
    The Physical Properties of the Ternary System Acetone-n-Butyl Alcohol-Water (1932)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 36 (1932), S. 842-854 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j150333a006
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  • 3
    Digitale Medien
    Digitale Medien
    The Physical Properties of the Ternary System Ethyl Alcohol–Glycerin–Water. (1936)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 40 (1936), S. 627-635 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j150374a008
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  • 4
    Digitale Medien
    Digitale Medien
    Stimulated soft electron spin echo envelope modulation spectroscopy (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 4954-4962 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: An improved technique of electron spin echo envelope modulation (ESEEM) spectroscopy using soft pulses is proposed. It is functionally related to the standard three-pulse stimulated echo experiment, but has an improved bandwidth. The general class of soft-ESEEM experiments is analyzed theoretically by using a product operator formalism. The predicted features are verified experimentally, in particular, the lack of blind spots and the observation of high modulation frequencies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.462738
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  • 5
    Digitale Medien
    Digitale Medien
    Transitions induced in a double minimum system by interaction with a quantum mechanical heat bath (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 5518-5532 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: A quantum mechanical treatment of a double minimum system interacting with a heat bath is presented for the purpose of interpreting experimental data on transfer kinetics in condensed hydrogen-bonded systems. The model describes the transfer motion in one or two dimensions. The heat bath is represented by a set of harmonic oscillators and the interaction by a term linear in the system coordinates and in the bath coordinates. Extending an earlier random field approach, the present treatment consistently accounts for the quantum nature of the total system. With crystalline benzoic acid dimer used as an example, the master equation for the populations of the energy levels of the hydrogen transfer motion is derived. Transition probabilities consistent with the principle of detailed balance are obtained, based on a representation with explicit off-diagonal tunnel interactions for pairs of states localized on different sides of the barrier and with diagonal terms describing the rearrangement of the heat bath as a consequence of the tunneling motion. The activation of the double minimum transfer process with increasing temperature is related to the excitation of the local vibrations in the two potential wells.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.459621
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  • 6
    Digitale Medien
    Digitale Medien
    Hydrogen bond dynamics in isotopically substituted benzoic acid dimers (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 1502-1520 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The hydrogen pair transfer in the hydrogen-bonded dimers of benzoic acid and its carboxyl-deuterated species is investigated in the solid. Measurements are reported for the temperature-dependent NMR relaxation time T1 in single crystals containing dimers with one or two carboxylic deuterons. Combined with previous data, the temperature dependence of the measurements is analyzed in terms of a master-equation description for a one- or two-dimensional quantum-mechanical model of the transfer motion. The description by a one-dimensional model is found to be inadequate as it yields unrealistic isotope effects in the model parameters. On the other hand, reasonable results are obtained for a two-dimensional model which includes, apart from the transfer motion of the hydrogens, a heavy atom mode with properties suggested by x-ray structural data. This model explains the thermal activation of the transfer process mainly as a result of promotion of tunneling by heavy atom rocking. Activation energies remain considerably smaller than the barrier height and indicate predominance of tunneling even at room temperature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.459129
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  • 7
    Digitale Medien
    Digitale Medien
    Low frequency pulse excitation in zero field magnetic resonance (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 6623-6635 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Zero field magnetic resonance experiments using semiselective excitation by low frequency pulses are analyzed. The prospects of phase cycling experiments in zero field are discussed and the differences between excitation by low frequency and direct current pulses are outlined. It is demonstrated that despite the selectivity of excitation all three transitions in a three-level system are observed. Deuterium quadrupolar resonance and computer simulations are employed to verify predictions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.455384
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  • 8
    Digitale Medien
    Digitale Medien
    Deregulation, Mergers, and Cost Savingsin Class I U.S. Railroads, 1974-1986 (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of economics & management strategy 1 (1992), S. 0 
    Details
    ISSN: 1530-9134
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Wirtschaftswissenschaften
    Notizen: In this paper we attempt to disentangle the effects of deregulation on rail costs from those directly attributable to mergers. We estimate that cost reductions obtained from mergers ranged from a high of 33% for the Burlington Northern to a low of a 3% cost increase for the CSX. However, firms not engaged in significant merger activities experienced similar cost differentials indicating that consolidation was not a prerequisite for cost savings. We conclude that although mergers did confer some benefits on the participating firms, they were not a prerequisite for railroads being able to achieve substantial cost savings.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1430-9134.1992.00339.x
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  • 9
    Digitale Medien
    Digitale Medien
    Costs, Institutional Mobility Barriers, and Market Structure: Advertising Agencies as Multiproduct Firms (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of economics & management strategy 3 (1994), S. 0 
    Details
    ISSN: 1530-9134
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Wirtschaftswissenschaften
    Notizen: What accounts for the diversity and limited concentration that has long characterized the organization of the advertising agency industry? This question is addressed by treating an advertising agency as a multiproduct firm. The firm's product line or service mix is defined in terms of the set of different media categories where an agency places the advertising messages that it creates on behalf of its clients. Evidence is presented indicating that the structure of demand and costs in the advertising agency industry conforms to the conditions that MacDonald and Slivinski showed were required for an industry to sustain an equilibrium with diversified firms.Building on this framework, we formulate a set of three hypotheses relating to the realization of product-specific scale and scope economies. The first two hypotheses posit that given low fixed costs and minimal entry barriers, both media-specific scale and scope economies are available and can be exploited by relatively small-size agencies. The third hypothesis suggests that large agencies may experience diseconomies of scope as a consequence of excessive diversification induced by two pervasive industry institutional phenomena: (1) “bundling” of agency services to match client demand for a mix of media advertising, and (2) “conflict policy,” which prohibits an agency from serving competing accounts and operates as a mobility constraint.Utilizing a multiproduct cost function, we estimate media-specific scale and scope economies for a cross section of 401 U.S. agencies in 1987. The results obtained support the set of three hypotheses outlined above. The paper concludes with a discussion of the implications of these findings for the restructuring currently underway in this industry.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1430-9134.1994.00437.x
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  • 10
    Digitale Medien
    Digitale Medien
    Allogeneic activation is increased during pregnancy. A risk factor in HIV infection? (1987)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 94 (1987), S. 0 
    Details
    ISSN: 1471-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1471-0528.1987.tb02278.x
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