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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 35 (1975), S. 117-135 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Typically collapsing supernova hydrodynamic computations assume LTE neutrino transport andimpose photon-like behavior, i.e., fix the neutrino chemical potentials at zero. The validity of the latter condition is investigated in the diffusion approximation to transport. A coupled system of diffusion equations for energy and lepton number is solved in a collapsing supernova ambience. The results indicate a substantial growth in the neutrino chemical potential for densities above 1012 gm cm−3. The rate of energy transport is affected significantly by the concomitant increases in Fermi integrals and gradients in chemical potential counter to those of temperature. It is found that the extent of neutrino particle/antiparticle interaction also affects energy diffusion rates. Thus the photon-like condition on neutrino transport may misrepresent supernova energetics substantially. An extension of the usual Sn transport to include lepton characteristics is deemed necessary for a definitive answer to the neutrino transport supernova question.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 36 (1975), S. 137-158 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The general problems of Fourier and spectral analysis are discussed. A discrete Fourier transformF N (v) of a functionf(t) is presented which (i) is defined for arbitrary data spacing; (ii) is equal to the convolution of the true Fourier transform off(t) with a spectral window. It is shown that the ‘pathology’ of the data spacing, including aliasing and related effects, is all contained in the spectral window, and the properties of the spectral windows are examined for various kinds of data spacing. The results are applicable to power spectrum analysis of stochastic functions as well as to ordinary Fourier analysis of periodic or quasiperiodic functions.
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  • 3
    Electronic Resource
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    Springer
    Astrophysics and space science 34 (1975), S. 123-130 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The physical adsorption energy,E, of hydrogen molecules on various substrates at temperatures between 5 and 30 K and at the lowest practicable gas densities has been measured. Values ofE/k are for condensed CO 340 K, CO2 800 K, H2O 850 K and for ‘dirty’ graphite 980 K and ‘dirty’ copper 800 K. From these measurements temperature ranges in which H atoms might combine on the surface to form H2 molecules are estimated. Duley has discussed the formation and composition of condensed gas mantles on interstellar grains. The effects of such mantles in promoting and poisoning hydrogen molecule formation are discussed.
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  • 4
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    Springer
    Cellular and molecular life sciences 31 (1975), S. 1389-1390 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The biological activity of the neuroleptic agent octoclothepin has been shown to be confined to its (+)-enantiomer which has theS-configuration.
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  • 5
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    Springer
    Cellular and molecular life sciences 31 (1975), S. 1327-1328 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 11, 12-Dihydroxy-7-methyl-4, 5, 6, 7, 7a, 8-hexahydrophenanthro[10, 1-b, c]-azepine (2), a homologue of apomorphine (1), has been found to be devoid of dopaminergic effects. The biological differences between apomorphine and this homologue are explained in terms of differences in conformation of the two molecules.
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  • 6
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    Springer
    Cellular and molecular life sciences 31 (1975), S. 656-657 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Nachweis, dass bestimmte Zellen im visuellen System, obwohl sie auf kurze transitorische Reize nicht reagieren, gleichmässig und langfristig auf Änderungen des Beleuchtungshintergrundes der Umgebung ansprechen.
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  • 7
    Electronic Resource
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    Springer
    Entomologia experimentalis et applicata 18 (1975), S. 75-86 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Des études en laboratoire sur le comportement alimentaire des larves de dernier âge de Sericesthis nigrolineata, ont montré que celles-ci sont moins actives en présence de racines mortes que dans un sol nu et se déplacent encore moins dans un sol avec présence de racines vivantes. Les larves ingèrent de façon sélective la matière organique du sol même sans plantes, mais la présence de racines vivantes a pour effet d'accroître la quantité de matière organique trouvée dans l'intestin des larves, d'accroître également la vitesse d'ingestion et la croissance larvaire. L'alimentation et la croissance des larves ne sont pas dépendantes de la quantité de matière organique contenue dans le sol, et il est suggéré que les larves se nourrissent préférentiellement sur les racines vivantes.
    Notes: Abstract In a laboratory study of feeding behaviour, final (third)-instar larvae of Sericesthis nigrolineata moved less in soil in the presence of dead roots than in soil alone, and less in soil in the presence of living roots than with dead roots. Larvae selectively ingested organic matter from soil with no plants but the presence of living roots produced increases in the amount of organic matter in the gut of larvae, the amount of organic matter removed from the food in the gut, the rate of ingestion and the rate of larval growth. The feeding and growth responses of larvae were not correlated with the quantity of organic matter present in the soil. It is suggested that the larvae preferentially select and feed on living roots.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 18 (1975), S. 244-254 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé La consommation des larves de troisième stade de Sericesthis nigrolineata a été mesurée sous des conditions de température constante. Les larves ont été placées dans un milieu de tourbe humide et nourries de carottes. La consommation augmente de façon exponentielle avec la température entre 4° et 30°; la partie inférieure de la courbe résulte du fait que les larves cessent de se nourrir, mais au haut de la courbe les larves sont tuées par les hautes températures. Les taux relatifs de croissance larvaire atteignent leur apogée à 17.5° et la croissance est nulle à 5° et 32°; le coefficient d'utilisation digestive est le plus élevé à 14° avec une valeur maximum de 11%. Les larves de troisième stade ont perdu du poids mais ont continué à se nourrir sauf pendant une courte période avant de se transformer en prépupes. Le développement larvaire dépend de la température et il n'y a aucune évidence de diapause pour les larves. En supposant qu'il n'y ait aucun changement dans le taux de croissance, on estime qu'une larve consomme 4237–5085 mg de carotte (poids humide) au cours de sa vie et la proportion de nourriture prise par les larves de premier, second et troisième stade augmente régulièrement d'un facteur × 3,5 à peu près entre chaque stade. Les données de consommation estimées pour les larves de S. nigrolineata, en se servant de carottes comme source de nourriture, représentent la meilleure estimation de ration alimentaire dont on dispose, en attendant que la consommation de racines d'herbe puisse être mesurée directement.
    Notes: Abstract Consumption of carrot by third-instar larvae of Sericesthis nigrolineata was measured under conditions of constant temperature. Consumption increased curvilinearly with increasing temperature between 4° and 30°. Larvae stopped feeding at the lower threshold, but at the upper threshold larval mortality prevented further feeding. Larval relative growth rate peaked at 17.5°, with zero growth at 5° and 32°, and the proportion of food converted to growth was greatest at 14° with a value of 11%. Late third-instar larvae lost weight but continued feeding, except for a short non-feeding period, before entering the prepupal stage. There was no evidence for a diapause by mature larvae.
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  • 9
    Electronic Resource
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    Springer
    Bulletin of environmental contamination and toxicology 13 (1975), S. 338-341 
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
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  • 10
    Electronic Resource
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    Springer
    Letters in mathematical physics 1 (1975), S. 75-82 
    ISSN: 1573-0530
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The definitions of fuzzy and hazy spaces are reviewed and consideration is given to using these spaces for representing physical phenomena. Two primitive situations are studied: the description of interactions among particles and the description of directions. It is shown that when a representation of discrete interactions is reduced to essentials a distributive lattice with a fuzzy space structure emerges quite naturally. To represent directions in a space with fairly arbitrary underlying structure, the hazy analogue of a differentiable manifold is required. Every point in a hazy space has associated with it a collection of subsets. The free group on these immediately gives a module over the integers as a tangent space at the point. Moreover the neighbourhood of each point has a chart map taking values in the module. By this means points are coordinatized and directions in the space can be described.
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