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  • 2020-2022  (5)
  • 2005-2009  (23)
  • 1980-1984  (29)
  • 1970-1974  (31)
  • 1905-1909
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  • 1
    Call number: SR 99.0487(40/13)
    In: Matematisk-fysiske meddelelser
    Type of Medium: Series available for loan
    Pages: 34 S.
    ISBN: 8773041394
    Series Statement: Matematisk-fysiske meddelelser / Det Kongelige Danske Videnskabernes Selskab 40/13
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 74 (1970), S. 3025-3027 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 294 (1981), S. 347-350 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fleischer etal.13 have previously reported the general etching conditions for zeolites. We have particularly investigated the effect of NaOH and KOH on chabazites. Homogeneous, inclusion-free chabazite crystals were annealed at 540 C for 2 h to erase all spontaneous tracks, mounted in epoxy resin ...
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 166-168 
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 23 (1972), S. 927-940 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Bekanntlich führt Fourier's klassische Theorie der Wärmeleitfähigkeit zu einer unendlich großen Ausbreitungsgeschwindigkeit lokaler Temperaturstörungen. Gurtin und Pipkin haben eine Theorie für starre Wärmeleiter mit Gedächtnis eingeführt und haben auch einen Beweis dafür gegeben, daß ihre Theorie auf eine endliche Ausbreitungsgeschwindigkeit führt. Die vorliegende Arbeit bezieht sich auf die linearisierte Form der Theorie von Gurtin und Pipkin für isotrope Leiter. Es werden Bedingungen für endliche Ausbreitungsgeschwindigkeit angegeben. Ferner wird die Eindeutigkeit der Lösungen für eine Klasse von history-value-Problemen angegeben, die durch die lineare Theorie nahegelegt werden.
    Notes: Summary It is well known that the classical theory of heat conduction, which is based upon Fourier's law, leads to infinite propagation speeds for thermal disturbances. In a recent investigation [1], Gurtin and Pipkin devised a theory appropriate to rigid heat conductors with memory, and put forth evidence that their theory gives rise in general to finite wave speeds. The present paper is concerned with the linearized version of the theory presented in [1], in the form it assumes for isotropic conductors. We arrive at conditions upon the material response functions that ensure the finiteness of the wave speeds. In addition, we establish uniqueness of solutions for a class of history-value problems suggested by the linearized theory.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 15 (1972), S. 499-508 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Cet appareil portatif est utilisé pour dénombrer les fourmis coupeuses de feuilles (Attinae) ou les fragments qu'elles transportent, le long de leurs trajets dans les cultures ou les forêts tropicales. Il utilise une batterie de 12 volts comme source de puissance. Les fourmis sont amenées à passer sous un portique placé sur leur trajet, interceptant alors un faisceau lumineux entre la source et une cellule photo-électrique. Le portique fait de structures mêtalliques creuses et comportant une rampe d'accès en cuivre peut enjamber une piste de fourmis de 20 cms de large; les détails de sa construction sont donnés Fig. 1 et 2. Le circuit électronique à l'intérieur de la boîte de contrôle (Fig. 3) est arrangé de telle sorte qu'aucun courant ne passe tant qu'aucune fourmi ne traverse le faisceau lumineux entre la source et la cellule photo-électrique; c'est seulement lorsqu'une fourmi intercepte ce faisceau lumineux que le relais et le compteur sont mis en circuit. Le compteur permet la distinction entre une fourmi chargée et une fourmi sans fardeau, d'après la hauteur à laquelle la rampe d'accès et de passage sous le portique est ajustée par rapport au faisceau de lumière. L'efficacité du comptage dépend de l'espèce de fourmi et des caractéristiques de la partie du végétal qui est coupée et transportée (Fig. 4). Les causes habituelles d'erreurs qui peuvent se présenter pour les observations à l'extérieur sont passées en revue et des indications sont fournies en vue de les éviter. Un compteur enregistreur sur papier capable de détecter et enregistrer les fourmis passant à un rythme allant jusqu'à 250/minute pendant des intervalles de 15 minutes à 24 heures est également décrit. Pour réduire la consommation de papier enregistreur, un dispositif réducteur est fixé en avant du compteur de façon que ce dernier n'enregistre que tous les 10, 100 ou 1000 passages. En utilisant un déroulement du papier à la vitesse de 2,5 cms par heure, le compteur travaille sans arrêt pendant 3 jours. Le dispositif peut être modifié par compter d'autres insectes qui se déplacent habituellement le long des trajets bien définis.
    Notes: Abstract This portable ant counter counts foraging leafcutting ants, or the leaf fragments they carry, along trails in tropical crops or forest. Ants intercept a light beam as they pass under a gantry between the light source and a photocell. The counter distinguishes between laden and unladen ants and works with an efficiency of 10–120% depending on the species of ant and the characteristics of the vegetation cut. The design could be modified to count other insects that habitually walk along well-defined tracks.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 16 (1973), S. 137-140 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of bioenergetics and biomembranes 3 (1972), S. 245-248 
    ISSN: 1573-6881
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Physics
    Notes: Abstract Values for the activation energy and pre-exponential factor from electrical conductivity measurements on polycrystalline isocytosine were found to be reproducible when evaporated electrodes were used. With pressure contacts a linear relationship exists between activation energy and the logarithm of the pre-exponential factor. This is shown to be an apparent and not a true compensation effect.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 19 (1984), S. 1904-1916 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper describes the application of linear elastic fracture mechanics analysis to the fracture of acrylic polymers in water. Three denture base acrylics were studied in addition to Perspex. The effects of strain rate and temperature were investigated using double torsion specimens and three-point bend specimens. It was found for most materials that the fracture toughness was dramatically increased on testing in water compared with testing in air. Crack propagation at fast strain rates was unstable in water and the fracture toughness and flaw size were strain-rate dependent, increasing with decreasing test rate, whilst the un-notched fracture strength decreased with decreasing strain rate. At low strain rates, stable crack propagation was achieved and fracture toughness then decreased with decreasing strain rate. The results are discussed in terms of Williams' model for environmental fracture and the effect water has on the crazing process taking place at the crack tip.
    Type of Medium: Electronic Resource
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