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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Kyklos 34 (1981), S. 0 
    ISSN: 1467-6435
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: In diesem Aufsatz werden Laborexperimente und Feldversuche in der ökonomie mit der Vorstellung von der Geschichte als einer Art Laboratorium von Wirtschaft und Gesellschaft in Verbindung gebracht. Diese Verknüpfung ist keineswegs willkürlich. Die Wirtschaftsgeschichte bringt nämlich von Zeit zu Zeit Situationen hervor, die durch die mehr oder weniger isolierte Variation einer Grösse Zusammenhänge wie von selbst transparent machen und damit Experimenten recht ähnlich sehen. Ist auch die Kontrolle der ≪Versuchsbedingungen≫ in wirtschaftshistorischen Quasiexperimenten weniger gut möglich als in der experimentellen Wirtschaftsforschung, so hält demgegenüber die Wirtschafts geschichte die realitätsnäheren Aufschlüsse bereit. Die betrachteten methodischen Ansätze werden jeweils durch empirische Fallstudien illustriert – etwa zum Thema ≪Kollektivgut und Trittbrettfahrerverhalten≫.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract This contribution continues the series of papers [2, 4, 5, 12] treated by Ludwig and collaborators. It is based on the generalized frame given in [6]; there Ludwig has set up an “infinite” axiomatic scheme as extension of the “finite” system [4, 5]. The results of [12] are then proved for a “locally finite” case; they lead to an extended representation theorem.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We continue here the series of papers treated byLudwig in [1–5]. Using some results ofDähn in [6], we point out that each irreducible solution of the axiomatic scheme set up in [5] is represented by a system of positive-semi-definite operator pairs of a finite-dimensional Hilbert-space over the real, complex or quaternionic numbers.
    Type of Medium: Electronic Resource
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  • 4
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    In:  CASI
    Publication Date: 2018-06-06
    Description: Computational tools that accurately predict the performance of electric propulsion devices are highly desirable and beneficial to NASA and the broader electric propulsion community. The current state of the art in electric propulsion modeling relies heavily on empirical data and numerous computational "knobs." In Phase I of this project, Tech-X Corporation developed the most detailed ion engine discharge chamber model that currently exists. This kinetic model simulates all particles in the discharge chamber along with a physically correct simulation of the electric fields. In addition, kinetic erosion models are included for modeling the ion-impingement effects on thruster component erosion. In Phase II, Tech-X developed a user-friendly computer program for NASA and other governmental and industry customers. Tech-X has implemented a number of advanced numerical routines to bring the computational time down to a commercially acceptable level. NASA now has a highly sophisticated, user-friendly ion engine discharge chamber modeling tool.
    Keywords: Spacecraft Propulsion and Power; Engineering (General)
    Type: An Overview of SBIR Phase 2 In-Space Propulsion and Cryogenic Fluids Management; 10; NASA/TM-2015-218829
    Format: application/pdf
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  • 5
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The utilisation of glucose and maltose was investigated with Lactobacillus strains isolated from sourdough starters. These preparations have been in continuous use for a long period to produce sourdough from rye, wheat and sorghum. The major metabolic products formed by resting cells from glucose or maltose were lactate, ethanol and acetate. Upon fermentation of maltose, resting cells of Lactobacillus sanfrancisco, L. reuteri, L. fermentum and Lactobacillus ep. released up to 13.8 mM glucose after 8 h. The ratio of released glucose per mol of utilised maltose was up to 1:1. Glucose formation was high when starved cells of L. sanfrancisco and Lactobacillus sp. were used. This is consistent with maltose utilisation via maltose phosphorylase which phosphorylates maltose without the expenditure of ATP and thus allows the cell to waste glucose in the presence of abundant maltose. The glucose formed may be utilised by the lactobacilli or other microorganisms, e.g. yeasts. However, the release of glucose into the medium by sourdough lactobacilli prevents competitors from utilising the abundant maltose by glucose repression. In strains of L. sanfrancisco, maltose utilisation was very effective and not subject to glucose repression. Therefore, they overgrow other microorganisms sharing this habitat. Wild isolates of L. sanfrancisco were initially unable to grow on glucose. Upon growth on maltose such strains required adaptation times of up to 150 h to grow on glucose. After subsequent transfer of glucose-grown cells to fresh medium the strains resumed growth both on glucose or maltose. They readily lost their ability to grow on glucose upon exposure to maltose. L. sanfrancisco exhibited biphasic growth characteristics on media containing glucose, maltose or both carbon sources. Evidence is provided that biphasic growth and metabolite formation are dependent on the redox potential.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Kyklos 22 (1969), S. 0 
    ISSN: 1467-6435
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: In this paper on power relations the author assumes that each participant (A, B) behaves rationally, aims at an increase of his utility. The assumption of the purely instrumental character of power constitutes a second important premise: power is supposed to be a means, not an end in itself.When A tries to compel B to do something he wouldn't otherwise have done by threatening retaliation against any disobedience of B, A is interested in the credibility of his threat indeed. However A has usually no incentive actually to carry out the threat in case of resistance by B. Moreover the realization of the threat very often causes considerable costs to the power-holder. Because of A's dilemma B stands a good chance of resisting the pretension of A without being punished. Finally the author analyses what counter-moves A can make.In another form of influence—often called ‘manipulation’—B doesn't notice at all that his goals conflict with those of A. A does not make explicit the ends he is striving for. As long as the assumption of rational behaviour is retained, this kind of influence can only occur in case of uncertainty—taste structure of A and B assumed constant.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Kyklos 32 (1979), S. 0 
    ISSN: 1467-6435
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Type of Medium: Electronic Resource
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