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  • 1
    Electronic Resource
    Electronic Resource
    Diffusion through a membrane: Approach to equilibrium (1976)
    Springer
    Bulletin of mathematical biology 38 (1976), S. 527-534 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The transfer of solute through a membrane separating two aqueous solutions is studied with the time-dependent diffusion equation for composite media. By introducing new independent and dependent variables it is shown that the differential equations and boundary conditions can be transformed into a dimensionless form which does not explicitly depend on the diffusivities of the media. Laplace transforms are used to derive explicit solutions for the solute concentration as a function of position and time. It is shown that at large time the concentration approaches the equilibrium distribution exponentially. Explicit results are given for the decay time as a function of the parameters of the system. In addition, an accurate and simplified expression is derived for the decay time for the case of small membrane permeability. The accuracy of the analytic solutions for the concentration profiles is tested by comparing them with numerical results obtained by solving the diffusion equations by the method of finite differences. Excellent agreement is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459551
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  • 2
    Electronic Resource
    Electronic Resource
    Elasticp+12C scattering between 0.3 and 2 MeV (1976)
    Springer
    The European physical journal 279 (1976), S. 41-45 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Absolute differential cross-sections ofp+12C elastic scattering have been measured atθ cm=89.1°, 118.7°, 146.9° for bombarding energies between 0.3 and 2.0 MeV. Revised level parameters of the first three excited states in13N have been extracted with aR-matrix analysis. It is shown that the influence of the bound ground-state of13N has an appreciable effect on low-energy scattering. Recent predictions concerning Mott-Schwinger polarization are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01409090
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  • 3
    Electronic Resource
    Electronic Resource
    Elastic scattering of16O and20Ne from235U (1976)
    Springer
    The European physical journal 277 (1976), S. 141-146 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The elastic scattering of 140-MeV16O and 175- and 252-MeV20Ne from235U has been measured. Experimental ratios of elastic to Rutherford scattering cross sections are analyzed in terms of both Fresnel scattering and optical models. The radius parameters derived from these analyses are found to be nearly independent of projectile energy. Total reaction cross sections are obtained and found to be in good agreement with the total fission cross section for these systems. Comparisons between the Fresnel theory and the optical model give generally good agreement. A simple formula which parameterizes the total reaction cross section in terms of the interaction radius is presented for16O and20Ne reactions.Nuclear Reactions:235U(16O,16O),E=140 MeV;235U(20Ne,20Ne),E=175 MeV, 252 MeV; measuredσ el; compared with Fresnel and optical models; deduced maximum angular momenta, interaction radii, total reaction cross section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01433705
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  • 4
    Electronic Resource
    Electronic Resource
    Loss of bioluminescence inAnomalops katoptron due to starvation (1976)
    Springer
    Cellular and molecular life sciences 32 (1976), S. 1175-1176 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary After 3 weeks of starvation the bacterial light-organs of the bioluminescent shallow-water fishAnomalops katoptron cease to produce light. Because of a reduction of the number of symbionts in the cells of the light organ, it is concluded that the fish supplies its luminescent bacteria with nutrients out of its own metabolism. As a result of starving the fish, the luminescent bacteria decrease in number and finally cease to emit light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01927610
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  • 5
    Electronic Resource
    Electronic Resource
    Armyworm defoliation in corn as seen on ir aerial photographs (1976)
    Springer
    Entomologia experimentalis et applicata 20 (1976), S. 301-303 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A corn field partially under attack by armyworms was photographed in 1973 with 70 mm Aerochrome Infrared Type 2443 film and a Wratten 12 filter at scales of 1/15,840 and 1/6,336 during the early silking stage. In 1974, in the absence of armyworm defoliation, the field was again overflown at the same plant stage, and with the same camera/film/filter configuration used in 1973. Defoliation was not detectable on otherwise healthy corn plants (i.e., no drought stress); but defoliation was detected on plants already under stress due to drought.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00573835
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  • 6
    Electronic Resource
    Electronic Resource
    Das erste Metaniobat mit Inselstruktur und fünffach koordiniertem Niob: Cs4[Nb4O12] (1976)
    Springer
    Naturwissenschaften 63 (1976), S. 386-386 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00607938
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  • 7
    Electronic Resource
    Electronic Resource
    Sur La comparaison des profils lunaires de C. B. Watts et Th. Weimer (1976)
    Springer
    Earth, moon and planets 16 (1976), S. 27-40 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Abstract The reduction of occultations observed by means of a double-image micrometer leads us to use limb profiles in order to determine limb corrections. After these corrections the dispersion of the results amounts to 0″.26 for reductions using C. B. Watts' lunar charts and 0″.35 for those using Th. Weimer's lunar profiles. The comparison of 18 profiles effectively used in our reductions permits us, in 17 cases, to show a difference between the adopted radii of the reference curves, sometimes with an offset. We translate this result in terms of a correction to the elevations given by Th. Weimer; this reduces to 0″.29 the dispersion of the results in the present case.
    Notes: Résumé La réduction d'observations d'occultations obtenues à l'aide d'un micromètre à double image nous amène à utiliser les atlas de profils lunaires en vue de la détermination des corrections de bord. La dispersion des résultats après ces corrections est de 0″.26 pour les réductions effectuées avec l'atlas de Watts et de 0″.35 pour celles effectuées avec l'atlas de Weimer. La comparaison de 18 profils effectivement utilisés dans nos réductions nous permet, dans 17 cas, de mettre en évidence une différence de rayon associée éventuellement à un excentrement des courbes de référence. Nous traduisons ce résultat sous forme d'une correction à apporter aux élévations données par Th. Weimer, ce qui ramène à 0″.29 la dispersion des résultats dans ce cas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648045
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  • 8
    Electronic Resource
    Electronic Resource
    Considerations concerning flare interpretations (1976)
    Springer
    Solar physics 47 (1976), S. 77-78 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152245
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  • 9
    Electronic Resource
    Electronic Resource
    Expansion of laser sparks produced by a mode-locked Nd: Glass-laser (1976)
    Springer
    Applied physics 10 (1976), S. 125-128 
    Details
    ISSN: 1432-0630
    Keywords: 52
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Investigations of laser sparks in N2 and He produced by a mode-locked laser were made with the help of a streak camera. An expansion away and towards the laser depending on the gas pressure was found. The measured expansion velocity of the spark is described by a model based on a radiation mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00896332
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  • 10
    Electronic Resource
    Electronic Resource
    Adiabatic variation—Part V: Nonlinear near-periodic oscillator (1976)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 27 (1976), S. 181-195 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Die langsame Modulation des fast-periodischen, aber beliebig nichtlinearen, dynamischen Systems eines Freihheitsgrades wird untersucht. Invarianz der Wirkung zu erster Ordnung wird für kaum glatte Modulation bewiesen; wenn der Hamiltonian analytisch in Zeit und Amplitude ist, wird die Wirkungsänderung exponential klein.
    Notes: Summary The slow modulation of a near-periodic, but otherwise arbitrarily nonlinear, dynamic system of one degree of freedom is studied. The action is shown to be a first-order invariant for barely smooth modulation, and to be invariant to exponential precision, if the Hamiltonian is analytic in time and amplitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01590804
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