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  • 1
    Electronic Resource
    Electronic Resource
    Permeation of sulfur dioxide through polymers (1975)
    s.l. : American Chemical Society
    Journal of chemical & engineering data 20 (1975), S. 235-242 
    Details
    ISSN: 1520-5134
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/je60066a008
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  • 2
    Electronic Resource
    Electronic Resource
    Water stress effects on guard cell anatomy and the mechanical advantage of the epidermal cells (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 9 (1986), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Vicia faba plants grown under water deficit were found to have guard cells considerably smaller than those of plants grown under well-watered conditions. Stomala of plants adapted to drought conditions have been observed in past studies to maintain opening at plant water potentials lower than those of plants not so adapted. By employing the geometric interpretation of the mechanical advantage (Wu, Sharpe & Spence, 1985), an anatomical/mechanical basis was found that helps explain how such opening in drought conditions can occur. The geometry and resulting mechanical properties of small stomata, in contrast to larger stomata, give them the capability of opening or maintaining open pores with lower guard cell turgor pressures, relative to the turgor of the surrounding epidermal cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11611639
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  • 3
    Electronic Resource
    Electronic Resource
    Stomatal mechanics. III. Geometric interpretation of the mechanical advantage (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 8 (1985), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Previous mathematical analyses of stomatal mechanics have demonstrated, and experimental measurements have confirmed, that the turgor-generated force of the epidermal cells dominates that of the guard cells in determining aperture. DcMichele & Sharpe (1973) termed the phenomenon the mechanical advantage of the epidermal cells, while Cooke et al. (1976) expressed it as an antagonism ratio. Both of these formulations, however, have theoretical or practical limitations. This study presents a biophysical analysis demonstrating that the effective forces in the stomatal system may be studied in terms of simple stomatal geometry. From this analysis, the mechanical advantage can be redefined and interpreted based upon simple geometric relationships calculated from measurable anatomical dimensions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11604674
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Comments on the problem of obtaining magnetic structures from nuclear magnetic resonance data (1968)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 24 (1968), S. 494-497 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The general systematic procedure is described for determining the magnetic space group (Shubnikov group) of a crystal from the magnetic point symmetry found from nuclear magnetic resonance data (Heesch, standard representation) and the crystallographic structure. The aspect group, which is the observed n.m.r. symmetry, is therefore defined and the Heesch groups which are related by the time inversion operation for magnetic moments to each aspect group are derived. The proposed method is demonstrated with a few specific examples. The difference between the concept of a magnetic point group and the concept of a Heesch group is clarified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739468001099
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Zu einer einheitlichen Theorie der Relaxationserscheinungen (1952)
    Springer
    The European physical journal 133 (1952), S. 109-123 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung In der heute üblichen verallgemeinerten Form erscheint die Relaxation als Eigenschaft des Ansprechens linearer Systeme. Die Annahme kausaler Ereignisfolge, nämlich, daß das Ansprechen — als Wirkung — der Störung — als Ursache —folgen muß, genügt für die Ableitung einer einheitlichen Relaxationstheorie. Die Ableitung der Theorie, die hier gegeben wird, beruht auf einer funktionentheoretischen Diskussion. Der Anschaulichkeit halber wird diese Diskussion an Hand eines Beispiels, nämlich der elastischen Relaxationserscheinungen, aber in allgemeiner Form durchgeführt. Bedingungen für das Auftreten diskreter und kontinuierlicher Relaxationsspektren werden erhalten, sowie Aussagen über die Verteilungsfunktion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01948687
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  • 6
    Electronic Resource
    Electronic Resource
    The measurement of curie-points with commercially available milli-oerstedmeters (1965)
    Springer
    Flow, turbulence and combustion 11 (1965), S. 103-104 
    Details
    ISSN: 1573-1987
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00384017
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    A method for the dynamic measurement of diffusivities of gases in polymers (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 19 (1975), S. 3193-3200 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A method is presented for determining the diffusivity of a gas in a polymer from the response to a step concentration change in a continuous-flow permeation chamber. The outlined procedure has several advantages over techniques currently in use: it requires simple numerical integration rather than curve fitting; it utilizes the complete response, rather than a portion of the response which falls within the region of validity of a short-time asympotic solution of the diffusion equation; and it is applicable both to flat membranes and cylindrical tubes. An illustration of the method is provided by the measurement of the diffusivity of sulfur dioxide in a PTFE tube at several temperatures.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1975.070191205
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