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Digitale Medien

Untersuchungen in der Cyclobutanreihe, XXIV. Eine. Umlagerung des Tricyclo[4.2.0.02.5]octan-Systems in das Tricyclo[4.2.0.02.4]octan-System (1969)

Avram, Margarete ; Mateescu, Gheorghe D. ; Dinulescu, Ilie G. ; [weitere]

Weinheim : Wiley-Blackwell

Berichte der deutschen chemischen Gesellschaft 102 (1969), S. 4008-4016

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ISSN: 0009-2940

Schlagwort(e): Chemistry ; Inorganic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Durch Addition von Brom an anti-Tricyclo[4.2.0.02.5]octadien-(3.7) (1) werden zwei isomere Tetrabromtricyclooctane 5 und 6 erhalten. Mit Basen spalten diese HBr ab und gehen in Dibromtricyclooctadien 7 über. Beim Erhitzen lagern sich 5 und 6 in die isomeren Tetrabromverbindungen 13 und 14 um, welche ein Tricyclo[4.2.0.02.4]octan-Skelett enthalten.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/cber.19691021207

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2

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Untersuchungen in der Cyclobutanreihe, XXIII. Cyclisierende Trimerisierung von tert.-Butylacetylen zu einem Dewar-Benzol-Palladiumchlorid-Komplex (1969)

Avram, Margarete ; Avram, Elise ; Mateescu, Gheorghe D. ; [weitere]

Weinheim : Wiley-Blackwell

Berichte der deutschen chemischen Gesellschaft 102 (1969), S. 3996-4007

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ISSN: 0009-2940

Schlagwort(e): Chemistry ; Inorganic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Aus tert.-Butylacetylen und (C6H5CN)2·PdCl2 bildet sich der Tri-tert.-butyl-Dewar-Benzolpalladiumchlorid-Komplex 1. Bei dessen reduktiver Zersetzung entsteht ein Monochlorderivat mit Bicyclo[2.2.0]hexen-Skelett (10). In Gegenwart von Brom oder Jod geht 1 in ein Dichlorid mit Bicyclo[3.1.0]hexen-Skelett (19) über. Unter dem Einfluß von Säuren entsteht aus 10 ein Fulven 29.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/cber.19691021206

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3

Digitale Medien

A linear finite element approach to the solution of the variational inequalities arising in contact problems of structural dynamics (1982)

Talaslidis, D. ; Panagiotopoulos, P. D.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 18 (1982), S. 1505-1520

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ISSN: 0029-5981

Schlagwort(e): Engineering ; Engineering General

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Mathematik , Technik allgemein

Notizen: The present paper deals with the theoretical and numerical treatment of dynamic unilateral problems. The governing equations are formulated as an equivalent variational inequality expressing D' Alembert's principle in its inequality form. The discretization with respect to time and space leads to a static nonlinear programming problem which is solved by an appropriate algorithm. Some properties of dynamic unilateral problems are outlined and the influence of several parameters on the solution is investigated by means of numerical examples.

Zusätzliches Material: 9 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/nme.1620181006

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4

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A model of binary alloy solidification (1984)

Wilson, D. G. ; Solomon, A. D. ; Alexiades, V.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 20 (1984), S. 1067-1084

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ISSN: 0029-5981

Schlagwort(e): Engineering ; Engineering General

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Mathematik , Technik allgemein

Notizen: A linear model for the solidification of a dilute binary alloy is presented. In this model the solidus and liquidus curves are linear. As a consequence internal energy depends linearly upon temperature and concentration. The formulation is a generalization of the well-known enthalpy method to treat a phase change problem involving coupled heat and mass transfer. Both analytic and numerical formulations are given. Results from the latter are presented and compared with an explicit solution of Rubinstein for a Stefan-like problem posed in a semi-infinite slab. Some remarks on the behaviour of the explicit solution are given.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/nme.1620200609

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5

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A posteriori estimates of the solution error caused by discretization in the finite element, finite difference and boundary element methods (1987)

Kelly, D. W. ; Mills, R. J. ; Reizes, J. A. ; [weitere]

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 24 (1987), S. 1921-1939

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ISSN: 0029-5981

Schlagwort(e): Engineering ; Engineering General

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Mathematik , Technik allgemein

Notizen: A theory is described which guarantees an upper and lower bound estimate of the discretization error in numerical solutions of elliptic boundary value problems. This method gives bounded global estimates of the error in the energy norm. Pointwise estimates of the error in the solution variable or its derivatives can then be obtained if the numerical solution is exhibiting pointwise monotonic convergence.The versatility of this method is illustrated by its application to numerical solutions from finite element, finite difference and boundary element methods.

Zusätzliches Material: 8 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/nme.1620241008

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6

Digitale Medien

Finite element analysis of nonlinear oscillators (1985)

Krishnamurthy, K. ; Burton, Thomas D. ; Zeller, Lavern D.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 21 (1985), S. 409-420

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ISSN: 0029-5981

Schlagwort(e): Engineering ; Engineering General

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Mathematik , Technik allgemein

Notizen: Presented in this paper is a finite element method for the analysis of nonlinear oscillations which exhibit periodic response. The basic idea of the method is to recast the initial value problem as a boundary value problem in which the domain (that is, period) may be unknown. We apply the method to study the free response of the conservative oscillator ü + mu + ∊f(u)=0, where m is either - 1, 0 or 1, f(u) is an odd nonlinear function, and ∊ need not be small. The harmonically forced case, ü + mu + ∊f(u) = Psin Ωt, is also considered, and it is shown that the superharmonic response can be efficiently calculated using this technique.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/nme.1620210303

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7

Digitale Medien

Letters to the editor (1984)

Sotiropoulos, G. H. ; Griffiths, D. F. ; Kumar, Prabhat ; [weitere]

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 20 (1984), S. 1169-1174

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ISSN: 0029-5981

Schlagwort(e): Engineering ; Engineering General

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Mathematik , Technik allgemein

Zusätzliches Material: 2 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/nme.1620200616

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8

Digitale Medien

Dynamic stress concentration studies by boundary integrals and Laplace transform (1981)

Manolis, G. D. ; Beskos, D. E.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 17 (1981), S. 573-599

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ISSN: 0029-5981

Schlagwort(e): Engineering ; Engineering General

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Mathematik , Technik allgemein

Notizen: The dynamic stress field and its concentrations around holes of arbitrary shape in infinitely extended bodies under plane stress or plane strain conditions are numerically determined. The material may be linear elastic or viscoelastic, while the dynamic load consists of plane compressional waves of harmonic or general transient nature. The method consists of applying the Laplace transform with respect to time to the governing equations of motion and formulating and solving the problem numerically in the transfomed domain by the boundary integral equation method. The stress field can then be obtaind by a numerical inversion of the trasformed solution. The correspondence principle is invoked for the case of viscoelastic material behavious. The method is simplified for the case of harmonic waves where no numerical inversion is involved.

Zusätzliches Material: 21 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/nme.1620170407

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9

Digitale Medien

Comparison of Hilber-Hughes-Taylor and Bossak ‘α-methods’ for the numerical integration of vibration equations (1983)

Adams, D. D. ; Wood, W. L.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 19 (1983), S. 765-771

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ISSN: 0029-5981

Schlagwort(e): Engineering ; Engineering General

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Mathematik , Technik allgemein

Zusätzliches Material: 8 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/nme.1620190510

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10

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Large deflection elastic-plastic analysis of plate structures by the finite strip method (1989)

Abayakoon, S. B. S. ; Olson, M. D. ; Anderson, D. L.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 28 (1989), S. 331-358

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ISSN: 0029-5981

Schlagwort(e): Engineering ; Engineering General

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Mathematik , Technik allgemein

Notizen: The finite strip method is applied to the non-linear analysis of plate structures. Large deflection effects are included via first order non-linearities in the strain-displacement relations, and material non-linearities are included via the von Mises yield criterion and associated flow rule. The virtual work equations are integrated numerically using Gauss quadrature, and the resulting non-linear equations are solved by Newton-Raphson iteration. Numerical results are presented for many applications including uniformly loaded rectangular and I beams, and square plates with either simply supported or clamped ends (or edges). The results are compared with known results from analytical and/or finite element analyses. Finally, a uniformly loaded stiffened panel is analysed and the results are compared with finite element results. In all cases, the results indicate that a single bending mode in the strip direction is sufficient to yield engineering accuracy for design purposes.

Zusätzliches Material: 23 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/nme.1620280207

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