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  • 1
    Electronic Resource
    Electronic Resource
    A design of CuInS2 single-crystal growth by the travelling-heater method (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 1762-1766 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF02457863
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  • 2
    Electronic Resource
    Electronic Resource
    A theoretical analysis of epitaxial growth of CuInS2 by chemical vapour deposition (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 1658-1663 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457847
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  • 3
    Electronic Resource
    Electronic Resource
    Somatic embryogenesis and plant regeneration in callus from inflorescences of Hordeum vulgare X Triticum aestivum hybrids (1984)
    Springer
    Theoretical and applied genetics 68 (1984), S. 375-379 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00267892
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  • 4
    Electronic Resource
    Electronic Resource
    Stress distributions along a short fibre in fibre reinforced plastics (1980)
    Springer
    Journal of materials science 15 (1980), S. 931-938 
    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 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00552105
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  • 5
    Electronic Resource
    Electronic Resource
    Complex moduli of aligned discontinuous fibre-reinforced polymer composites (1982)
    Springer
    Journal of materials science 17 (1982), S. 3499-3509 
    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 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
    URL: http://dx.doi.org/10.1007/BF00752195
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  • 6
    Electronic Resource
    Electronic Resource
    Application of the principles of linear fracture mechanics to the composite materials (1982)
    Springer
    International journal of fracture 20 (1982), S. 3-15 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00942161
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  • 7
    Electronic Resource
    Electronic Resource
    Crack-growth resistance of laminated hybrid SMC composites (1984)
    Springer
    International journal of fracture 24 (1984), S. 179-188 
    Details
    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 Le but de ce travail est de caractériser le comportement à la croissance de la fissure de composites hydrides constitués de deux séquences d'empilement différentes, à savoir C% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaOqaaiaaigdadaWcba% WcbaGaaGymaaqaaiaaikdaaaaaaa!39AA!\[1\tfrac{1}{2}\]R/C/% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaOqaaiaaigdadaWcba% WcbaGaaGymaaqaaiaaikdaaaaaaa!39AA!\[1\tfrac{1}{2}\]R/C et R/C/% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaOqaamaaleaaleaaca% aIXaaabaGaaGOmaaaaaaa!38EF!\[\tfrac{1}{2}\]R/C/% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaOqaamaaleaaleaaca% aIXaaabaGaaGOmaaaaaaa!38EF!\[\tfrac{1}{2}\]R/C/R. La lettre C de ce composite hybride représente une couche comportant 50% en poids de fibres composites continues et R représente une couche de fibres composites comportant 50% en poids de fibres fractionnées et réparties au hasard. On a choisi des éprouvettes de traction compactes présentant des entailles orientées soit parallèlement soit perpendiculairement à la direction des fibres des couches C. Dans les cas où l'on a observé une croissance de fissure dans une direction perpendiculaire à la direction de l'entaille, on a constaté que la résistance à la flexion était un paramètre adéquat pour caractériser cette croissance de fissure. Dans certains cas de croissance de la fissure, on a constaté que la résistance à la rupture était inférieure aux prédictions lorsque celles-ci étaient établies sur une proposition de règle de mélange, basée sur les taux de relaxation d'énergie de fissuration dans les couches C et dans les couches R.
    Notes: Abstract The present work is aimed at characterizing the crack-growth behavior of hybrid composites having two different stacking sequences, namely; [C% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaOqaaiaaigdadaWcba% WcbaGaaGymaaqaaiaaikdaaaaaaa!39AA!\[1\tfrac{1}{2}\]R/C/% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaOqaaiaaigdadaWcba% WcbaGaaGymaaqaaiaaikdaaaaaaa!39AA!\[1\tfrac{1}{2}\]R/C] and [R/C/% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaOqaamaaleaaleaaca% aIXaaabaGaaGOmaaaaaaa!38EF!\[\tfrac{1}{2}\]R/C/% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaOqaamaaleaaleaaca% aIXaaabaGaaGOmaaaaaaa!38EF!\[\tfrac{1}{2}\]R/C/R]. The letter C in these hybrids represents a 50% weight fraction continuous fiber composite layer while the R represents a 50% weight fraction randomly oriented chopped fiber composite layer. The standard compact tension specimens having notches oriented along and perpendicular to the fiber direction of the C layers were chosen. The flexural strength is purported to be an adequate parameter for crack-growth characterization in the cases where the observed crack-growth was in the direction perpendicular to the notch direction. For the cases of self-similar crack-growth, the measured fracture resistance was found to be lower than that predicted by a proposed rule-of-mixture relationship based upon the crack-energy release rates of the C layers and R layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032681
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of testosterone on the female hamster harderian gland pigmentation and ultrastructure (1980)
    Springer
    Cell & tissue research 207 (1980), S. 511-517 
    Details
    ISSN: 1432-0878
    Keywords: Female hamster ; Harderian gland ; Testosterone ; Tubular clusters ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Distinct differences occur in the pigmentation and ultrastructural features of the Harderian glands in male and female hamsters. The results of a study on the effect of testosterone on the fine structure of the female Harderian glands are presented here. Glands from three groups of hamsters were examined at intervals up to 49 days: (1) testosterone injected, receiving 2mg testosterone propionate in 0.1 ml sesame oil per day; (2) sham-injected, receiving 0.1 ml sesame oil per day; (3) untreated controls. Testosterone injections caused a reduction in the number of dark-brown pigment granules in the acinar cells starting on the 6th day, whereas clusters of tubules, typical of adult male glands, appeared on the 4th day and increased in number thereafter. Lamellar structures, normally present in the female gland, decreased in testosterone treated specimens. These changes reversed after cessation of testosterone treatment. It is concluded that exogenous testosterone administered to female hamsters modifies the pigmentation and ultrastructure of their Harderian glands towards the male type and that this is a reversable phenomenon. There also appears to be an inverse relationship between the presence of tubular clusters in the acinar cells, and the degree of pigmentation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224624
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  • 9
    Electronic Resource
    Electronic Resource
    Mechanical characterization of sheet molding compound composites (1983)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 4 (1983), S. 167-171 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The present work was aimed at providing basic mechanical property characterization of five different sheet molding compound (SMC) materials with glass content varying from 30 to 65 percent by weight. In particular, the objectives were to find variation in their tensile, flexural, and shear properties along with some information on fabrication-induced anisotropy that may be present in these materials. The flexural properties were measured using three-point bend tests, and double-rail shear tests were conducted for in-plane shear properties. A significant scatter was observed in all the properties, and no conclusive evidence about the fabrication-induced anisotropy was found, Flexural strength of each material was found to be significantly greater than the tensile strength. Finally, some interesting features associated with their tensile and flexural failure modes have also been discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750040306
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  • 10
    Electronic Resource
    Electronic Resource
    Singular finite element efficiency in estimating stress intensity factors (1981)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 17 (1981), S. 557-572 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Singular finite element displacement functions for linear elastic fracture mechanics applications are investigated. The displacement fields are expressed in terms of polynomials. These polynomials are expanded in varying degrees of r and θ in order to examine the effect of the number and type of terms on the solution to various problems with known solutions. Methods of estimating the stress intensity factors for mode 1 and mode 2 are presented. Numerical results evaluating the effect of various r and θ terms on the solutions are presented.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620170406
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