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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 1762-1766 
    ISSN: 0392-6737
    Keywords: Methods of crystal growth and purification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si è fatta un'analisi teorica per studiare la cinetica coinvolta nella crescita del cristallo di CuInS2 col metodo del riscaldatore mobile. Si sviluppa uno schema numerico per calcolare il gradiente di temperatura in ogni punto del sistema. Si è ottenuta una stima numerica del valore di massimo accrescimento come suggerimento per stabilire la velocità di spostamento del riscaldatore nell'esperimento pratico.
    Abstract: Резюме Проводится теоретический анализ кинетики выращивания кристалла CuInS2, используя метод перемещающегося нагревателя. Развивается схема вычисления градиента температуры в любой точке внутри системы. Получается численная оценка максимальной скорости роста для установления скорости перемещения нагревателя в практическом эксперименте.
    Notes: Summary A theoretical analysis has been carried out to investigate the kinetics involved in the CuInS2 crystal growth by the travelling-heater method. A numerical scheme is developed to compute the temperature gradient at any point inside the system. A numeric estimate of the maximum growth rate was obtained as a suggestion for setting the travelling speed of the heater in the practical experiment.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 1658-1663 
    ISSN: 0392-6737
    Keywords: Methods of crystal growth and purification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto È stata condotta un'analisis teorica per studiare la cinetica implicata nella crescita CVD di CuInS2. Si assume un modello a strato stagnante per la simulazione numerica. Si ottengono risultati di calcolo per il tasso di crescita in funzione della temperatura del substrato, la velocità media del gas e le pressioni parziali nel tubo di reazione. Questa analisi indica che la temperatura del substrato gioca un ruolo dominante nel tasso di crescita, che è consistente con i dati sperimentali.
    Abstract: Резюме Теоретически исследуется кинетика роста кристаллов CuInS2 посредством химического осаждения пара. Для численного моделирования предполагается слоистая модель. Получены численные результаты для скорости роста в зависимости от температуры подложки, средней скорости газа и парциальний в реакторе. Проведенный анализ показывает, что температура подложки играет существенную роль в определении скорости роста, что согласуется с нашими экспериментальными результатами.
    Notes: Summary A theoretical analysis has been carried out to investigate the kinetics involved in the CVD growth of CuInS2. A stagnant-layer model is assumed for the numerical, simulation. Computational results for the growth rate as a function of the substrate temperature, mean, gas velocity and partial pressures in the reaction tube are obtained. This analysis indicates that the substrate temperature plays a dominant role in the growth rate, which is consistent with our experimental data.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 60 (1965), S. 426-434 
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 25 (1969), S. 763-764 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Herzen gesunder, erwachsener Ratten wurden mit Krebs-Henseleit-Bikarbonatlösung durchströmt (95% O2∶5% CO2). Bei künstlich herbeigeführter Hypoxie (95% N2∶5% CO2) erschienen die Herzmitochondrien innerhalb von 7 min bedeutend vergrössert und zu 25% miteinander verschmolzen.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 25 (1969), S. 301-302 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Es wurden 2 Typen von membrangebundenen Zytoplasmastrukturen im vorliegenden Endothel von normalen Hundeaorten gefunden. Teilweise handelt es sich um rauhe parallele Mikrotubuli (240 Å) und um kristallines Material mit einer Periode von 130–180 Å. Die funktionelle Korrelation von Mikrotubuli und den kristallinen Strukturen ist noch unklar.
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 216 (1967), S. 252-253 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1-7. Electron micrographs of ultra-thin sections of the Orgueil meteorite showing the round structures. Small pieces of the Orgueil meteorite (from the Smith -sonian Institution, Washington, DC, by courtesy of Dr G. Claus, Long Island University) were embedded in 'Epon' resin to facilitate ...
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  • 7
    ISSN: 1432-2242
    Keywords: Hordeum X Triticum-hybrids ; Somatic embryogenesis ; Regeneration ; Inflorescence ; Chromosome doubling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Embryogenic callus cultures were obtained by culturing young inflorescence tissues of Hordeum vulgare cv. ‘PF51811’ (2x)XTriticum aestivum cv. ‘Chinese Spring’ (6x) hybrids on 2,4-D-containing N6 medium. After subculture for about 10 months the calli retained a high potentiality for somatic embryogenesis and plant regeneration. Of about 300 regenerated plants, approximately 100 were transplanted to potting soil. Eight embryoids and three regenerated plants examined had 28 chromosomes identical to the original hybrid plants, while one regenerated plant was found to be a mixploid composed of cells with 28 and 56 chromosomes. The possibility for obtaining amphiploid hybrids through tissue culture is discussed.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 15 (1980), S. 931-938 
    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 develops an analysis for predicting the normal stress and interfacial shearing stress distribution along a single reinforcing fibre of a randomly oriented chopped-fibre composite, such as sheet moulding compound (SMC), from a knowledge of the constituent properties and the length-to-diameter ratio of the fibres. The analysis is useful in analysing the tensile strength of SMC, and as a guide to increasing the tensile strength by altering the elastic characteristics. The model is based on a generalized shear-lag analysis. Numerical values of the normal stress and interfacial shearing stress are presented as functions of various parameters. It is observed that the maximum normal stress occurs at the middle of the fibre and the maximum shear stress occurs at the end. The analysis is restricted to loading which does not result in buckling of the fibre; i.e., axial loads on the fibre can be at most only slightly compressive.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 17 (1982), S. 3499-3509 
    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 recent analytical and experimental efforts to determine the effects of fibre aspect ratio, fibre spacing, and the viscoelastic properties of constituent materials on the damping and stiffness of aligned discontinuous fibre-reinforced polymer matrix composites. This includes the analysis of trade-offs between damping and stiffness as the above parameters are varied. Two different analytical models show that there is an optimum fibre aspect ratio for maximum damping, and that the predicted optimum aspect ratios lie in the range of actual aspect ratios for whiskers and microfibres when the fibre damping is small. When the fibre damping is great enough, however, the optimum fibre aspect ratio corresponds to continuous fibre reinforcement. Experimental data for E-glass/epoxy specimens are presented for comparison with predictions.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    International journal of fracture 20 (1982), S. 3-15 
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Résumé On examine l'application du principe de la mécanique linéaire de rupture aux matériaux composites orthotropes. On montre que la ténacité à la rupture de composites unidirectionnels est indépendante de la longueur de la fissure mais dépend de l'orientation des fibres par rapport à cette fissure. Pour vérifier de manière expérimentale les principes ci-dessus, on a utilisé un matériau en verre epoxy unidirectionnel (Scotchply 1002). La ténacité à la rupture du Scotchply 1002 pour différentes orientations fibre/fissure a été obtenue en utilisant un programme à élément fini Solid Sap et des éprouvettes de traction compactes. On a trouvé une formule empirique mettant en relation la ténacité à la rupture du matériau pour différentes orientations fibre/fissure.
    Notes: Abstract Application of the principles of linear fracture mechanics to the orthotropic composite materials is examined. It is shown that fracture toughness of unidirectional composites is independent of crack length but dependent on crack-fiber orientation. For experimental verification of the above principles, uni-directional glass epoxy material (Scotchply 1002) was used. The fracture toughness of Scotchply 1002 for different crack-fiber orientations is obtained by utilizing Solid Sap finite element program and compact tension specimens. An empirical formula relating the fracture toughness of the material for different crack-fiber orientation is found.
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