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  • Articles  (29)
  • Springer  (29)
  • American Physical Society
  • Ovid Technologies
  • 1970-1974  (9)
  • 1965-1969  (20)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (20)
  • Chemistry and Pharmacology  (11)
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  • Articles  (29)
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  • 1
    Electronic Resource
    Electronic Resource
    Organelle in der Eizelle vonDryopteris filix-mas (L.) Schott (1966)
    Springer
    Naturwissenschaften 53 (1966), S. 232-232 
    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/BF00633908
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  • 2
    Electronic Resource
    Electronic Resource
    Some comments on the parameter choices for S.C.M.O. calculations on five membered heteroatomic π-electron systems (1968)
    Springer
    Theoretical chemistry accounts 10 (1968), S. 1-12 
    Details
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Bei den üblichen semiempirischen SCMO-Rechnungen an Heteroaromaten ergeben sich unerwartete Abhängigkeiten der Ladungsverteilung von den β Rumpf-Termen [1]. Die gebräuchlichste Parameterwahl führt zu chemisch unverständlichen Ladungsverteilungen bei Furan und Pyrrol [2]. Es wird gezeigt, daß der erste Effekt mit der relativen Größe der Diagonalelemente der Fockmatrix zusammenhängt; der zweite Effekt hängt sehr stark von den Nichtnachbarelementen ab: Bei Einschluß von Nichtnachbar-β Rumpf-Termen und entsprechender Parameterwahl erhält man befriedigende Ladungsverteilungen.
    Abstract: Résumé Il a été indiqué [1] que le traitement semi-empirique S.C.M.O. habituel des systèmes d'électrons π dans les hétérocycles comporte des relations in attendues entre la distribution de charge et les termes β coeur impliquant les hétéroatomes. D'autres chercheurs [2] ont affirmé que les choix les plus communs de paramètres fournissent des densités de charge dans le furane et le pyrrole déraisonnables sur le plan chimique. On montre ici que le premier effet est lié aux grandeurs relatives des éléments diagonaux de la matrice de Fock et que le second effet dépend fortement des éléments non immédiatement voisins de cette matrice, mais peut être annulé avec certains choix de paramètres par introduction des termes non voisins β coeur dans les calculs.
    Notes: Abstract It has been reported [1] that the usual semi-empirical S.C.M.O. treatments of heteroatomic π-electron systems yield unexpected dependencies of charge distribution on the β core terms involving the heteroatoms. Other workers [2] have claimed that the most usual choices of parameters yield chemically unreasonable charge densities in furan and pyrrole. It is shown here that the first effect is related to the relative magnitudes of the diagonal elements of the Fock matrix and that the second depends very strongly on the nonnearest neighbor F matrix elements but can be overcome with certain parameter choices by the inclusion of non-nearest neighbor β core terms in the calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00529038
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of acid phosphatase-1 null activity mutants of Drosophila melanogaster (1973)
    Springer
    Biochemical genetics 10 (1973), S. 39-55 
    Details
    ISSN: 1573-4927
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A complementation analysis was performed on 15 Acph-1 n alleles. Only three of these alleles proved to be nonleaky and to exhibit no evidence of complementation. These were then tested immunologically to determine their level of antigenically cross-reacting material (CRM). Their CRM levels were virtually zero, as compared to low, but positive, levels for two other homozygous Acph-1 n mutants and considerably higher levels for heteroallelic combinations of some of the leaky alleles. Acid phosphatase-1 enzyme subunits, formed by dissociating native enzyme, have close to 100% CRM activity in tests with antibodies elicited by native enzyme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00485747
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  • 4
    Electronic Resource
    Electronic Resource
    An investigation of grain-boundary sliding during creep (1967)
    Springer
    Journal of materials science 2 (1967), S. 313-323 
    Details
    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 A detailed experimental study of the behaviour of grain boundaries between surface grains has been carried out on a magnesium alloy, Magnox AL 80. Different methods of assessing the strain due to grain-boundary sliding were compared; the general agreement obtained confirmed the view that, under conditions of low stress and high temperature, sliding can play a very important role in the overall deformation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00572414
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  • 5
    Electronic Resource
    Electronic Resource
    Grain-boundary slide-hardening in zinc bicrystals (1968)
    Springer
    Journal of materials science 3 (1968), S. 524-533 
    Details
    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 Zinc bicrystals containing high-angle tilt boundaries, and others containing twist boundaries were subjected to constant shear stresses parallel to the boundary at temperatures in the range 20 to 300° C. At stresses both above and below that necessary to cause macroscopic slip in the constituent crystals, the grain-boundary sliding rate decreased with time. This “slide-hardening” at the grain-boundary was identified with the formation of asperities in the grain-boundary which were generated first near the intersection of boundary and free surface. Removal of the layer containing these asperities restored the boundary behaviour to that of a virgin bicrystal in certain cases. This leads to the conclusion that when slide-hardening occurs, the rate-limiting process for grain-boundary sliding is that associated with the deformation of the crystal regions which have been introduced into the original boundary plane by grain-boundary migration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00549736
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  • 6
    Electronic Resource
    Electronic Resource
    Surface and interior measurements of grain boundary sliding during creep (1970)
    Springer
    Journal of materials science 5 (1970), S. 933-944 
    Details
    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 Measurements of grain boundary sliding have been made on polycrystalline specimens of Magnox AL80, a magnesium-0.78 wt% aluminium alloy, at successive strains during creep at 200° C under a stress of 2800 psi. Three independent methods were used to determine the strain due to sliding (ε gb) at the surface and two to determineε gbin the interior of the specimens. The one direct method of measuringε gbin the interior used oxide markers introduced by extruding a composite billet. The values ofε gbobtained from the offsets in these interior markers were found to agree with those given by the three sets of measurements made on the surface, but not with those from the indirect method for the interior which relies on the measurement of grain strain via grain shape changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00558172
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  • 7
    Electronic Resource
    Electronic Resource
    Induction of null-activity mutants for the acid phosphatase-1 gene in Drosophila melanogaster (1972)
    Springer
    Biochemical genetics 6 (1972), S. 205-216 
    Details
    ISSN: 1573-4927
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Sixteen null-activity mutants were obtained for the acid phosphatase-1 system (3–101.1) in Drosophila melanogaster using ethylmethanesulfonate as the mutagen. They were selected by combining an electrophoretic analysis and a spot test assay for acid phosphatase which, together, allowed the screening of large numbers of mutagenized chromosomes. Five mutants were obtained by electrophoretic analysis alone, and an additional 11 were recovered when the spot test was used. Flies homozygous for three of the Acph-1 0 mutants were found to be viable and fertile. Also, the relative mutability of two allozyme loci and two genes whose effect is on adult morphology were examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486404
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  • 8
    Electronic Resource
    Electronic Resource
    The inclusion of non-nearest neighbor ß terms in pariser-parr-pople type S.C.M.O. calculations (1967)
    Springer
    Theoretical chemistry accounts 8 (1967), S. 203-211 
    Details
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé Le calcul des propriétés des électrons π par une méthode S.C.M.O. tenant compte de tous les termes β coeur a été étendu aux systèmes contenant de l'azote et de l'oxygène. Les transitions électroniques singulet π→π* et les potentiels d'ionisation (lorsqu'ils sont connus) sont en accord raisonnable avec l'expérience. Les résultats sont comparés aux calculs non-empiriques de tous les électrons effectués par Clémenti pour le pyrrole, la pyridine et la pyrazine.
    Abstract: Zusammenfassung Die Berechnung von π-Elektronen-Eigenschaften mittels einer SCMO-Methode, die alle β core-Terme einschließt, wurde auf Systeme mit Stickstoff- und Sauerstoffatomen ausgedehnt. Die Singulett-π→π *-Übergänge und π-Ionisierungsenergien sind in vernünftiger Übereinstimmung mit dem Experiment. Es wird einen Vergleich mit den nichtempirischen Rechnungen mit allen Elektronen von Clementi an Pyrrol, Pyridin und Pyrazin angestellt.
    Notes: Abstract The calculation of π-electron properties by an S.C.M.O. method including all β core terms has been extended to nitrogen and oxygen containing systems. The singlet π * →π electronic transitions and π-ionization potentials (where available) are in reasonable agreement with experiment. A comparison is made with the non-empirical all electron calculations of Clementi for pyrrole, pyridine and pyrazine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00527305
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  • 9
    Electronic Resource
    Electronic Resource
    On the dynamic mechanical behaviour of drawn poly(ethylene terephthalate) fibers (1968)
    Springer
    Colloid & polymer science 228 (1968), S. 54-58 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Der Einfluß von Verstreckung und Temperaturbehandlung auf den α-Übergang in Poly(äthylenterephthalat), PET, Garn wurde untersucht unter Anwendung von Röntgen- und dynamisch-mechanischen Methoden. Es wurde gefunden, daß für hohe Vergütungstemperaturen verstreckte, kristalline PET-Garne eine Verschiebung des α-Überganges zu niedrigeren Temperaturen aufweisen, ähnlich wie für nicht verstrecktes, kristallines PET. Der Hauptunterschied zwischen verstreckten und nicht verstreckten Garnen ist die Lage des α-Überganges auf der Temperaturskala; der α-Übergang liegt für höhere Verstreckung bei höheren Temperaturen. Die Verlagerung des α-Überganges durch Temperaturbehandlung wird auf die Anzahl der Kristallite zurückgeführt, während seine Verschiebung durch Verstreckung erklärt wird durch die Orientierung in den amorphen Bezirken.
    Notes: Abstract The effect of drawing and annealing treatments on the α transition in poly(ethylene terephthalate), PET, yarns has been studied using a combination of X-ray and dynamic mechanical techniques. It was found that drawn, crystalline PET yarns exhibit a shift in the position of the α transition to lower temperatures for high annealing temperatures; this effect has been observed for unoriented, crystalline PET. The main difference between the results for the drawn and unoriented yarns lies in the position of the α transition on the temperature scale; the α transition occurs at higher temperatures the higher the draw ratio. The shift in the position of the α transition with anealing is interpreted in terms of the number of crystals whilst the change in position of the α transition brought about by drawing is explained by orientation in the amorphous regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02125764
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  • 10
    Electronic Resource
    Electronic Resource
    The dependence of grain-boundary sliding on shear stress (1968)
    Springer
    Journal of materials science 3 (1968), S. 306-313 
    Details
    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 Polycrystalline specimens of four materials: aluminium, a lead/thallium alloy,β-brass and Magnox AL80 were subjected to slow creep at a temperature of approximately 0.5T m (whereT m is the melting temperature in degrees Kelvin) and measurements made of the dependence of grain-boundary sliding on the orientation of the boundary with respect to the applied stress. The results were analysed in detail on the basis of the hypothesis that sliding is governed by the component of the applied stress resolved in the boundary plane. Agreement between theory and experiment leads to the conclusion that this is a most important factor governing sliding. The component of sliding revealed by steps on a free surface is seen to contain an extra term due to the unbalanced pressure from grains below the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00741967
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