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  • 1
    Electronic Resource
    Electronic Resource
    Photoenhanced wet oxidation of gallium nitride (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 511-513 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate the photo-oxidation process and the corresponding passivation effects on the optical properties of unintentionally doped n-type gallium nitride (GaN). When illuminated with a 253.7 nm mercury line source, oxidation of GaN is found to take place in aqueous phosphorus acid solutions with pH values ranging from 3 to 4. At room temperature, the photo-oxidation process is found reaction-rate limited and has a peak value of 224 nm/h at pH=3.5. Compared with the as-grown GaN layers, threefold enhancement in the photocurrent and photoluminescence response are observed on the oxidized GaN surfaces. These results are attributed to the surface passivation effects due to the deep ultraviolet-enhanced wet oxidation on GaN. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125804
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  • 2
    Electronic Resource
    Electronic Resource
    Nuclear behavior in vegetative hyphae of Trichophyton terrestre (1974)
    Springer
    Mycopathologia 53 (1974), S. 69-75 
    Details
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Vegetative nuclear division inTrichophyton terrestre Durie & Frey was studied utilizing the aceto-orcein squash technique. Nuclear division included: no directional preference to the hyphal axis; longitudinal splitting of daughter nuclei; and a haploid chromosome count of four. Interphase and prophase nuclei were morphologically similar to those of higher plants, however, various degrees of chromosome condensation and elongation were noted. Spindle pole bodies were prominent at metaphase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02127198
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  • 3
    Electronic Resource
    Electronic Resource
    The mitotic configuration of Chaetomium globosum (1973)
    Springer
    Mycopathologia 51 (1973), S. 243-249 
    Details
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The somatic nuclear division ofChaetomium globosum was studied utilizing acetocarmin and aceto-orcein techniques. Nuclear division in hyphae of this species was found to be mitotic, but diversity in morphology and division configuration was noted. Identifiable chromosomes, the metaphase plate, and the chromosome bridge were commonly seen. A combination of extremely small nuclei, difficulties in staining, multinucleate conditions, and protoplasmic streaming in hyphae presented difficulties for these studies. Contradictory views are held on the structure of the nucleus, presence of the centriolar body, and other karyological features as described byFinley (1970)Rabinow &Bakerspigel (1965). Nuclear division structural details in a few other fungal species such as the centriolar body, spindle apparatus, and nuclear membrane disassociation have been examined by electron microscopy (Motta, 1969;Ichida &Fuller, 1968;Namboodiri &Lowry, 1967). The present study and the previous report onC. globosum (Hsu, Yu &Volz, 1972) presents comparative data for a NASA Appollo 16 MEED Mycology investigation now in progress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02057796
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  • 4
    Electronic Resource
    Electronic Resource
    The meiotic configuration of Chaetomium globosum (1973)
    Springer
    Mycopathologia 50 (1973), S. 145-150 
    Details
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Nuclear behavior during ascus development inChaetomium globosum was studied with the use of acetocarmine and aceto-orcein staining techniques. The chromosome behavior, including centriolar bodies and asynchronous disjunction of chromosomes, agreed with the basic pattern reported in Ascomycetes (Olive, 1965). The haploid chromosome complement of this strain appeared to be 6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02049952
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  • 5
    Electronic Resource
    Electronic Resource
    The microbial ecology evaluation Device mycology spaceflight studies of Apollo 16 (1974)
    Springer
    Mycopathologia 54 (1974), S. 221-233 
    Details
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Four fungal species were selected as the test systems for the Microbial Ecology Evaluation Device (MEED) of Apollo 16. Fungal cells were exposed to various quantitative and qualitative spaceflight parameters then returned for postflight analyses. Survival rates and phenotype numbers varied according to exposure parameters. Additional studies underway will further identify the spaceflight changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02050043
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  • 6
    Electronic Resource
    Electronic Resource
    The infinite sheet with two radial cracks from cylindrical hole under inclined tension or in-plane shear (1977)
    Springer
    International journal of fracture 13 (1977), S. 839-845 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00034326
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  • 7
    Electronic Resource
    Electronic Resource
    Elastic-plastic analysis of a flat ring subject to internal pressure (1977)
    Springer
    Acta mechanica 27 (1977), S. 155-172 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Für die Spannungen in einem flachen Ring, durch Druck belastet, wird eine exakte elastisch-plastische Lösung auf der Grundlage derJ 2 Deformationstheorie in Verbindung mit einem modifizierten Ramberg-Osgood-Gesetz erhalten. Die Ergebnisse werden auf der Basis des Kriteriums von Budiansky, für die Anwendbarkeit derJ 2 Deformationstheorie bewertet. Durch Verwendung exakter elastisch-plastischer Spannungen wird die radiale Aufweitung und die permanente Zunahme der Ringdicke am inneren Rand erhalten. Nach Wegnahme des Druckes werden Restspannungen am inneren Rand produziert.
    Notes: Summary An exact elastic-plastic solution for the stresses in a flat ring subject to pressure is obtained on the basis ofJ 2 deformation theory together with a modified Ramberg-Osgood law. The results are assessed on the basis of Budiansky's criterion for the acceptability ofJ 2 deformation theory. By using exact elastic-plastic stresses, the radial enlargement and the permanent increase in thickness of the ring at the hole are obtained. Upon release of the pressure, residual stresses are produced around the hole.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01180083
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  • 8
    Electronic Resource
    Electronic Resource
    Interaction between a circular hole and an elastic-plastic crack under uniform shear load1 (1977)
    Springer
    Acta mechanica 28 (1977), S. 101-112 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Zur Untersuchung der Wechselwirkung zwischen einem elastisch-plastischen Riß und einem kreisförmigen zylindrischen Loch in einem unendlich ausgedehnten, elastischen Material wird die Theorie der stetig verteilten Schraubenversetzungen verwendet. Der Körper ist im Unendlichen durch eine gleichmäßig verteilte Schubbelastung beansprucht, die eine nichtebene Deformation hervorruft. Exakte Lösungen werden für den Effekt des Loches in der Versetzungsverteilungsfunktion, das Verhältnis aufgebrachte Last zur plastischen Zone, die relative Schubverformung entlang des Risses und der plastischen Zone und die Rißspitzenverschiebung erhalten.
    Notes: Summary The theory of continuously distributed screw dislications is used to study the interaction between an elastic-plastic crack and a circular cylindrical hole in an infinite elastic medium. This medium is under uniformly distributed shear load at infinity which produces anti-plane deformation. Exact solutions are obtained for the effect of the hole on the dislocation distribution function, the applied load-plastic zone relationship, the relative shear displacement along the crack and the plastic zone, and the crack-tip opening displacement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01208792
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  • 9
    Electronic Resource
    Electronic Resource
    The infinite sheet with cracked cylindrical hole under inclined tension or in-plane shear (1975)
    Springer
    International journal of fracture 11 (1975), S. 571-581 
    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 détermine les facteurs d'intensité des contraintes à la racine d'une fissure radiale issue d'un trou circulaire dans un feuillard infini, soumise respectivement à une tension uniforme dans une direction d'inclinaison arbitraire β, et à un cisaillement uniforme dans son plan. L'analyse des contraintes est effectuée en utilisant la formulation de Muskhelishvili et une représentation conforme. Les valeurs numériques des facteurs d'intensité des contraintes sont obtenues pour divers rapports L/R de la longueur de la fissure sur le rayon du trou.
    Notes: Abstract The stress intensity factors are determined at the root of a radial crack emanating from a circular hole in an infinite sheet, under uniform tension in the direction at an arbitrary inclination with angle β and uniform in-plane shear, respectively. The stress analysis is carried out using the Muskhelishvili formulation and the conformal mapping. Numerical results of the stress intensity factors are obtained for varying crack length-to-hole radius ratio, L/R.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00116365
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  • 10
    Electronic Resource
    Electronic Resource
    Interaction between an elastic circular inclusion and two symmetrically placed collinear cracks (1976)
    Springer
    International journal of fracture 12 (1976), S. 619-630 
    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 étudie la ténacité à la rupture d'une grande plaque plane et élastique comportant des fissures et une inclusion élastique circulaire, en utilisant comme critère de rupture le facteur d'intensité des contraintes en état plan de tension. Dans ce type de géométrie, on aligne une paire de fissures linéaires et finies de part et d'autre de l'inclusion circulaire, et on soumet cette disposition à une contrainte uniforme à l'infini. L'analyse est basée sur la théorie de l'élasticité bidimensionnelle grâce à l'approche par variables complexes due à Muskhelishvili. Les calculs numériques sont effectués pour le cas de la traction simple normale à la direction des fissures et montrent la variation du facteur d'intensité des contraintes avec la configuration de la tôle et de l'inclusion ainsi qu'avec leurs propriétés élastiques.
    Notes: Abstract This paper investigates the fracture toughness of a flat large elastic cracked plate containing an elastic circular inclusion, using the plane stress crack-tip stress intensity factor as a criterion for fracture. In this plane stress geometry, each of the two collinear finite cracks is located on either side of the elastic circular inclusion and the geometry is subjected to uniform stresses at infinity. The analysis is based on the two-dimensional theory of clasticity by using the Muskhelishvili complex variable approach. Numerical calculations are reported for the case of simple tension normal to the crack direction, and show the variation of the stress intensity factor with the configuration and elastic properties of the plate and the inclusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00034647
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