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  • 1
    Electronic Resource
    Electronic Resource
    Electron transfer. 68. Mediation by N-substituted isonicotinoyl derivatives (1984)
    s.l. : American Chemical Society
    Inorganic chemistry 23 (1984), S. 1988-1990 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00181a043
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  • 2
    Electronic Resource
    Electronic Resource
    Proto-oncogene fos: Factors Affecting Expression and Covalent Modification of the Gene Product (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 511 (1987), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Notes: Expression of proto-oncogene fos is induced in response to a variety of growth factors and differentiation-specific agents. However, the induction of fos gene expression is not influenced by inhibition of protein synthesis. We, therefore, entertained the notion that expression of the fos gene may be governed by posttranslational modification of cellular transcriptional factors. We report here that transcription of the human c-fos gene is modulated by negatively and positively acting cellular factors.The nuclear protein products of the resident oncogene of the FBJ-murine osteosar-coma virus (v-fos) and its corresponding cellular proto-oncogene (c-fos) are stoichiometrically phosphorylated on serine and threonine residues. The c-fos protein is more highly phosphorylated than the v-fos protein due to the phosphorylation of unique sites tentatively localized to the c-terminal 20 amino acid residues. The protein kinase C agonist, TPA, stimulates phosphorylation of the c-fos, but not the v-fos protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1987.tb36242.x
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  • 3
    Electronic Resource
    Electronic Resource
    Adhesive contact during the oblique impact of elastic spheres (1979)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 30 (1979), S. 468-476 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Résumé On établit une représentation intégrale de la distribution de traction tangentielle pendant le contact adhésif entre deux sphères de matériaux élastiques similaires chargées obliquement. On démontre que des conditions adhésives s'établisseut au commençement d'un choc entre deux sphères aux petits angles d'incidence ou après une période initiale de glissement aux angles plus grands. Une équation différentielle décrivant cette phase du choc est élaborée et résolue.
    Notes: Abstract An integral representation is developed for the distribution of tangential traction during adhesive contact between obliquely loaded elastic spheres of similar materials. It is shown that adhesive conditions arise at the beginning of an impact between two spheres at low angles of incidence or after an initial period of gross slip for larger angles. A differential equation is developed and solved, describing this phase of the impact.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01588891
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of heat flow on the contact area between a continuous rigid punch and a frictionless elastic half-space (1976)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 27 (1976), S. 439-445 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Résumé On donne une preuve générale du théorème que, si un poinçon continu rigid, pénétrant un demi-espace élastique, est chauffé, la séparation des solides grandira et une partie de la région de contact sera perdue. On montre également que la région de contact ne peut pas être multiplement connexe si le poinçon est convexe.
    Notes: Abstract A general proof is given of the theorem that, if a continuous rigid punch indenting an elastic half space is heated, the separation of the solids will increase and part of the contact area will be lost. It is also shown that if the punch is convex, the contact area cannot be multiply-connected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01594900
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  • 5
    Electronic Resource
    Electronic Resource
    Contact problems involving a cooled punch (1978)
    Springer
    Journal of elasticity 8 (1978), S. 409-423 
    Details
    ISSN: 1573-2681
    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: Résumé Les problèmes de contact thermoélastiques pour un demi-espace entaillé par un poinçon rigide refroidi n'ont pas parfois de solution établie. On décrit un modèle simple demontrant qu'on évite ce paradoxe en supposant une résistance thermique varient en raison inverse du pression de contact. On retiens linearité avec un cas limitatif de ce système en introduisant une condition de contact “imparfait” ou le pression de contact est négligeable mais il y a de la résistance thermique de contact significative. On généralise cette méthode pour permetter la formulation des problèmes de contact thermique dans trois dimensions et un problème de ce type est résolu en cas de symetrie axiale. On donne des resultats particulières pour le demi-espace entaillé par une sphère rigide refroidie.
    Notes: Abstract Certain problems in which a cooled rigid punch indents an elastic half-space have no steady state solution. A simple model is described in which it is shown that this paradox is avoided by the assumption of a thermal resistance varying inversely with contact pressure. A limiting case of this system retains linearity and introduces a state of “imperfect” contact in which contact pressure is negligible but there is significant thermal contact resistance. This approach is generalized to permit the formulation of three dimensional contact problems and one such problem is solved for an axisymmetric geometry. Particular results are given for the identation of a half-space by a cooled rigid sphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00049190
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  • 6
    Electronic Resource
    Electronic Resource
    Stress concentration due to an array or hemispherical cavities at the surface of an elastic half-space (1992)
    Springer
    Journal of elasticity 28 (1992), S. 111-122 
    Details
    ISSN: 1573-2681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The paper investigates the perturbation in an otherwise uniform stress field in an elastic half-space due to a doubly-periodic array of small hemispherical holes at the free surface. The solution is obtained using three potential functions of double Fourier series form in Galerkin's strain potential solution, the coefficients of which are determined using the collocation method. The unperturbed field is taken to be one of uniform plane stress parallel to the free surface. Two special cases are studied—uniform tension and uniform shear stress. Numerical results for these cases can be generalized by superposition to give solutions for a general state of biaxial plane stress. It is found that, for both tension and shear, the maximum stress concentration occurs at the bottom of the holes. The stress concentration factor increases with the ratio of hole spacing to radius, approaching the known solution for a single hemispherical hole at large ratios.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041775
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  • 7
    Electronic Resource
    Electronic Resource
    The distortion of a cylinder with non-uniform axial heat conduction (1983)
    Springer
    Journal of elasticity 13 (1983), S. 441-447 
    Details
    ISSN: 1573-2681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Closed form expressions are developed for the thermoelastic curvature of the initially plane end faces of a traction free cylinder subjected to arbitrary axisymmetric heat flux, the curved surfaces being assumed insulated. The solution is developed from a potential function representation of displacement and temperature for an elastic layer. The reciprocal theorem is invoked to show that the tractions at the curved surface of the cylinder vary linearly along the axis and they are removed by superposition of biaxial bending. It is found that the curvature of the plane ends depends on the local heat flux and the mean heat flux, whilst the cylindrical face distorts into a cone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042521
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  • 8
    Electronic Resource
    Electronic Resource
    Some polynomial solutions for the non-axisymmetric Boussinesq problem (1984)
    Springer
    Journal of elasticity 14 (1984), S. 217-221 
    Details
    ISSN: 1573-2681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Solutions to the Boussinesq problem for the circular punch without axial symmetry can be obtained from corresponding axisymmetric solutions by parametric differentiation. The method is applied to the problem of the tilted flat punch, originally solved by Green, and to the indentation of a cylindrical surface by a flat circular punch.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041668
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  • 9
    Electronic Resource
    Electronic Resource
    Some anomalies of the curved bar problem in classical elasticity (1991)
    Springer
    Journal of elasticity 26 (1991), S. 75-86 
    Details
    ISSN: 1573-2681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The classical formulation of the ‘homogeneous’ problem of a curved bar loaded only by and end force involves the assumption of an appropriate stress function with four arbitrary constants and the determination of these constants from the boundary conditions. Since there are five boundary conditions, four on the curved edge and one at the end, the solution is only possible because the coefficient matrix of the resulting algebraic equations is singular. This in turn means that certain inhomogeneous problems in which the curved edges are loaded by sinusoidally varying tractions cannot be solved using apparently appropriate stress functions. Additional stress functions which resolve this difficulty are introduced and an example problem is solved, which exhibits qualitatively different behavior from that in more general cases of loading. The problem is then reconsidered as a limiting case of sinusoidal loading of arbitrary wavelength. It is shown that the solution of the latter problem appears to become unbounded as the special case is approached, but that when the end conditions have been correctly satisfied by superposing an appropriate multiple of the end-loaded solution, the limit can be approached regularly and the correct special solution is recovered. The limiting process reveals a general procedure for determining the additional stress functions required for the special case. Similar relationships between homogeneous and inhomogeneous solutions for other common geometries are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041152
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  • 10
    Electronic Resource
    Electronic Resource
    Indentation of the semi-infinite elastic solid by a concave rigid punch (1976)
    Springer
    Journal of elasticity 6 (1976), S. 149-159 
    Details
    ISSN: 1573-2681
    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: Австракт Получело решение тля взаимоотношенея между загрузкой, смещением и внутренным радиусом кнтакта для аксисиммэттичночо сферчно вогнуточо жесткого пробойника, вдавливающечося на улругом полупростралспве. Аналитические пэриплижелия развиваются для пределъних случаев, когда отношение внутренних ивнешних радиусов колъцевого района контакта или мало или близко к единице. Эти приближения хорошо совпадают при промежуточных значениях. Этот метод птрименяезт кконичэскому вогнупому пробойнику и к тробойнику с централщным отверстием.
    Notes: Abstract A solution is obtained for the relationship between load, displacement and inner contact radius for an axisymmetric, spherically concave, rigid punch, indenting an elastic half-space. Analytic approximations are developed for the limiting cases in which the ratio of the inner and outer radii of the annular contact region is respectively small and close to unity. These approximations overlap well at intermediate values. The same method is applied to the conically concave punch and to a punch with a central hole.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041783
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