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  • Artikel  (161)
  • Springer  (154)
  • Nature Publishing Group  (4)
  • American Physical Society  (3)
  • 1980-1984  (61)
  • 1925-1929  (100)
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  • Artikel  (161)
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  • 1
    Digitale Medien
    Digitale Medien
    Light-dependent synthesis of cholecalciferol in a green plant (1980)
    [s.l.] : Nature Publishing Group
    Nature 283 (1980), S. 68-69 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] For the present studies, T. flavescens and other grasses were sown in a dark room in wooden frames containing finely sieved soil and covered by cubic tents of aluminium foil to exclude all radiation from the outside. Inside, Grolux lamps of 30 W each were placed 60cm above the soil surface. ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/283068a0
    Standort Signatur Erwartet Verfügbarkeit
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    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Biological optimality: Comparison of generalized feasibility and optimality conditions for linear, error-minimizing systems (1982)
    Springer
    Bulletin of mathematical biology 44 (1982), S. 777-791 
    Details
    ISSN: 1522-9602
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Mathematik
    Notizen: Abstract An attempt is made to compare the conditions for the general error-optimality of linear systems developed by Kalman with the conditions for feasibility of linear models of neuromuscular and physiological control systems. Models of three actual physiological systems are tested for both the above criteria. Theoretical analysis presented here shows that there are no simple relationships between the two sets of conditions. Analysis carried out on the physiological systems models suggests the need for a general set of conditions for other optimality criteria, such as time and energy minimization, similar to Kalman's condition for error minimization.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02465180
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Photoreceptor properties of an ectopic eye in the fleshfly,Sarcophaga bullata (1980)
    Springer
    Cellular and molecular life sciences 36 (1980), S. 993-994 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Ectopic eyes were produced on the fleshfly,Sarcophaga bullata by transplantation of imaginal eye discs. Electrophysiological and histological observations of these supernumerary eyes indicate the absence of synaptic connections between retinular cells and higher order neurons.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01953841
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Development of visual sensitivity in the fly,Sarcophaga bullata (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 1318-1319 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Ontogeny of light response in the compound eyes of the fly,Sarcophaga bullata was investigated. Even though the eyes are structurally differentiated before eclosion they become electrophysiologically functional only after eclosion.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01990392
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Mitteilungen aus verschiedenen Gebieten (1925)
    Springer
    Naturwissenschaften 13 (1925), S. 223-226 
    Details
    ISSN: 1432-1904
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01558887
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    The soft X-ray polychromator for the Solar Maximum Mission (1980)
    Springer
    Solar physics 65 (1980), S. 53-71 
    Details
    ISSN: 1573-093X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The 1.4–22.4 Å range of the soft X-ray spectrum includes a multitude of emission lines which are important for the diagnosis of plasmas in the 1.5–50 million degree temperature range. In particular, the hydrogen and helium-like ions of all abundant solar elements with Z 〉 7 have their primary transitions in this region and these are especially useful for solar flare and active region studies. The soft X-ray polychromator (XRP) is a high resolution experiment working in this spectral region. The XRP consists of two instruments with a common control, data handling and power system. The bent crystal spectrometer is designed for high time resolution studies in lines of Fe i-Fe xxvi and Ca xix. The flat crystal scanning spectrometer provides for 7 channel polychromatic mapping of flares and active regions in the resonance lines of O viii, Ne ix, Mg xi, Si xiii, S xv, Ca xix, and Fe xxv with 14″ spatial resolution. In its spectral scanning mode it covers essentially the entire 1.4–22.5 Å region. This paper summarizes the scientific objectives of the XRP experiment and describes the characteristics and capabilities of the two instruments. Sufficient technical information for experiment feasibility studies is included and the resources and procedures planned for the use of the XRP within the context of the Solar Maximum Mission is briefly discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00151384
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Experimental study of quantum size effects in very thin metal films (1980)
    Springer
    Applied physics 21 (1980), S. 397-406 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 73 ; 79.40
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The influence of the quantum size effect (QSE) in very thin Pd and Au films (0.5〈d〈10 [nm]) deposited on glass tips is studied by means of field emission at various anode potentials. The thickness-dependent field emission current characteristics show short periodic variations with a period of about 0.3 nm for both Pd and Au. The measured QSE oscillations and their amplitudes differ strongly from those expected qualitatively from model calculations for the smallest thicknesses. A model for the metal film based on a modification of the uniform background model is presented, and the thickness dependence of the conductance and the field emission current density are qualitatively discussed. Possible explanations of some discrepancies between calculations and the measured field emission current characteristics are proposed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00895932
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Future for magnetic fusion (1983)
    [s.l.] : Nature Publishing Group
    Nature 302 (1983), S. 371-371 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] SIR - On 22 February 1983 the General Accounting Office (GAO) released a preliminary report that I had requested last year on the status of the Department of Energy s (DoE)'s implementation of the Magnetic Fusion Engineering Act of 1980. The request for the study was made in January 1982 in ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/302371a0
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Asymmetry in the Radiation from the Hydrogen Atom in the Electric Field (1929)
    [s.l.] : Nature Publishing Group
    Nature 124 (1929), S. 125-126 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IN my monograph “Axialität der Lichtemission und Atomstruktur” (Polytechnische Buchhandlung A. Seydel, Berlin, 1927) I have discussed a case of asymmetry of radiation; if atoms of an element, say of helium, pass through a gas such as hydrogen, under certain conditions for some spectral lines of ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/124125b0
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Weitere Beobachtungen über die Dissymmetrie der Emission von Serienlinien (1929)
    [s.l.] : Nature Publishing Group
    Nature 124 (1929), S. 946-946 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] AN einer früheren Stelle dieser Zeitschrift (NATURE, Juli 27, 1929, p. 125) habe ich eine kurze vorläufige Mitteilung über die neue Erscheinung der Dissymmetrie der Lichtemission im elektrischen Feld veröffentlicht. Im Folgenden seien kurz die Ergebnisse weiterer Beobachtungen über diese ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/124946b0
    Standort Signatur Erwartet Verfügbarkeit
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