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  • 1
    Digitale Medien
    Digitale Medien
    Paraganglion of the prostate gland: an uncommon mimic of prostate cancer in needle biopsies (2005)
    Oxford, UK : Blackwell Science Ltd
    Histopathology 47 (2005), S. 0 
    Details
    ISSN: 1365-2559
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2559.2005.02043.x
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  • 2
    Digitale Medien
    Digitale Medien
    Analysis of the prognostic implications of different tumour margin types in renal cell carcinoma (2003)
    Oxford, UK : Blackwell Science Ltd
    Histopathology 43 (2003), S. 0 
    Details
    ISSN: 1365-2559
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Aims: Invasion of perinephric tissues is part of the Union Internationale Contre le Cancer (UICC) (1997) T staging criteria for renal cell carcinoma (RCC) and appears to confer a worse prognosis. However, there are no established histological criteria to determine if this has occurred and histopathologists differ in their interpretation of the tumour margin. The purpose of this study was to determine histological criteria for invasion of perinephric tissues that may be used in staging.Methods and results: We assessed the prognostic implications of different margin types in 176 cases of RCC with good follow-up data. The tumour margin type in each cases was classified as follows: fibrous tumour capsule; rim of kidney; fibrous capsule with ‘collar stud’ invasion; pushing margin, no capsule; and tumour cell invasion of fat. The margin types were used in univariate and multivariate survival analysis to determine which had most impact on disease-free survival. In Cox regression analysis with all other influential covariates cellular invasion of fat was the only margin type that had any prognostic impact, conferring a 2.9 relative hazard compared with tumours with a fibrous capsule (P = 0.007).Conclusions: For staging purposes the designation of a tumour as invading perinephric tissues should be limited to those cases that have tumour cells invading the perinephric fat.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2559.2003.01721.x
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  • 3
    Digitale Medien
    Digitale Medien
    Demonstration of somatic mutation and colonic crypt clonality by X-linked enzyme histochemistry (1988)
    [s.l.] : Nature Publishing Group
    Nature 333 (1988), S. 461-463 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Fig. 1. Mosaic pattern of histochemical localization of G6PD activity in large bowel from an untreated female mouse heterozy-gous for the GPDX gene (C3HxGPDX). The picture is rep-resentative of that seen in ten 12-week-old animals. They were killed by CO2 inhalation, the bowel removed, opened, ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/333461a0
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  • 4
    Digitale Medien
    Digitale Medien
    Finite elements for incompressible flow (1979)
    Chichester, West Sussex : Wiley-Blackwell
    Mathematical Methods in the Applied Sciences 1 (1979), S. 16-31 
    Details
    ISSN: 0170-4214
    Schlagwort(e): Mathematics and Statistics ; Applied Mathematics
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik
    Notizen: We describe in this paper a finite element method for the solution of viscous incompressible flow problems which incorporates an approximate form of the incompressibility condition automatically into the finite element basis. Several examples of such finite elements are presented and applied to a simple test problem.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mma.1670010103
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  • 5
    Digitale Medien
    Digitale Medien
    Finite element methods for second order differential equations with significant first derivatives (1976)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 10 (1976), S. 1389-1396 
    Details
    ISSN: 0029-5981
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: Galerkin finite element methods based on symmetric pyramid basis functions give poor accuracy when applied to second order elliptic equations with large coefficients of the first order terms. This is particularly so when the mesh size is such that oscillations are present in the numerical solution. In the present note asymmetric linear and quadratic basis functions are introduced and shown to overcome this difficulty in an appropriate two point boundary value problem. In particular symmetric quadratic basis functions are oscillation free and highly accurate for a working range of mesh sizes.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/nme.1620100617
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  • 6
    Digitale Medien
    Digitale Medien
    Analysis of error growth for explicit difference schemes in conduction-convection problems (1980)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 15 (1980), S. 1075-1081 
    Details
    ISSN: 0029-5981
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: A detailed study is made of the error growth associated with explicit difference schemes for a conduction-convection problem. It is shown that the error can become arbitrarily large after a finite number of time steps even though it ultimately decays to zero. Certain ambiguities reported in the literature can thereby be resolved.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/nme.1620150708
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  • 7
    Digitale Medien
    Digitale Medien
    Generalized Petrov-Galerkin methods for the numerical solution of Burgers' equation (1984)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 20 (1984), S. 1273-1289 
    Details
    ISSN: 0029-5981
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: Generalized Petrov-Galerkin methods are applied in two different ways for the numerical solution of Burgers' equation. In the first place, it is used to produce upwinding in the way described by Mitchell and Griffiths.9,10 The main objective of this paper is in the second place to use it as a moving finite element method. In particular, it is shown that the methods of Miller and co-workers4-6 and Herbst et al.7,8 can be incorporated in the more general approach presented in this paper. Several choices for the test functions are discussed and numerical results are given.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/nme.1620200708
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  • 8
    Digitale Medien
    Digitale Medien
    Letters to the editor (1984)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 20 (1984), S. 1169-1174 
    Details
    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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  • 9
    Digitale Medien
    Digitale Medien
    On the approximation of convection problems in fluid dynamics (1977)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 11 (1977), S. 1477-1483 
    Details
    ISSN: 0029-5981
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: It is well-known that oscillatory result when cerntral difference of finite element approximations are suoght for convective and boundary layer flows unless the grid length is sufficiently small. A priori limits on the grid spacing, bleow which the solutions are oscullation freee, are derived form one-dimensional idenlizations of these problems and result form boundaryb layer theiry.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/nme.1620110911
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  • 10
    Digitale Medien
    Digitale Medien
    The cause and cure (?) of the spurious pressures generated by certain FEM solutions of the incompressible Navier-Stokes equations: Part 1 (1981)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 1 (1981), S. 17-43 
    Details
    ISSN: 0271-2091
    Schlagwort(e): Finite Element ; Navier-Stokes ; Incompressible Flows ; Penalty Methods ; Pressure Filters ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: The spurious pressures and ostensibly acceptable velocities which sometimes result from certain FEM approximate solutions of the incompressible Navier-Stokes equations are explained in detail. The concept of pressure modes, physical and spurious, pure and impure, is introduced and their effects on discretized solutions is analysed, in the context of both mixed interpolation and penalty approaches. Pressure filtering schemes, which are capable of recovering useful pressures from otherwise polluted numerical results, are developed for two particular elements in two-dimensions and one element in three-dimensions. Implications regarding the effect of spurious pressure modes on accuracy and ultimate convergence with mesh refinement are discussed and a list of unanswered questions presented. Sufficient numerical examples are discussed to corroborate the theory presented herein.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/fld.1650010104
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