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  • Engineering  (5)
  • Polymer and Materials Science  (4)
  • Graft rejection  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Der Einfluß von Azetylsalizylsäure und Dipridamol auf die Abstoßung allotransplantierter Hundenieren bei präsensibilisierten Empfängern (1976)
    Springer
    Research in experimental medicine 169 (1976), S. 109-122 
    Details
    ISSN: 1433-8580
    Keywords: Renal transplantation ; Graft rejection ; Platelet thrombi ; Antiaggregating drugs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of antiaggregating agents - acetylsalicyclic acid (ASA) and dipyridamol - on the rejection of allotransplanted canine kidneys in presensitized animals were studied. Blood flow dropped more markedly in the control group than in the group treated with ASA and dipyridamol. 24 hours after transplantation the blood flow in this group was significantly higher than in the control group (p 2,5 %) and in the third group treated with dipyridamol alone. The cellular rejection started earlier and was more pronounced in the control group. Only in this group vascular rejection and microthrombi were demonstrated. Urine output ceased 24 to 60 hours after transplantation. The immunosuppressive, antiphlogistic and platelet antiaggregating effect of the combined ASA and dipyridamol therapy is thought to be responsible for the better results in this group. In this experimental model the combined treatment of ASA and dipyridamol results in a later onset of cellular rejection, in better blood-flow of the kidney and later onset of anuria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01851172
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  • 2
    Electronic Resource
    Electronic Resource
    Wirkung von Acetylsalicylsäure und einem Pyrido-pyrimidin-Derivat auf die Abstoßung allotransplantierter Nieren im Tierexperiment (1975)
    Springer
    Research in experimental medicine 165 (1975), S. 67-73 
    Details
    ISSN: 1433-8580
    Keywords: Renal transplantation ; Graft rejection ; Platelet thrombi ; Antiaggregating drugs ; Nierentransplantation ; Transplantatabstoßung ; Thrombocytenthromben ; Thrombocytenaggregationshemmende Pharmaka
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Thrombocytenaggregationshemmende Pharmaka — Acetylsalicylsäure und 2-Piperazinyl-4-thiomorpholino-pyrido(3,2-d)-pyrimidin-Sulfattrihydrat—werden in ihrer Wirkung auf Abstoßungsreaktionen bei allotransplantierten Nieren an Hunden untersucht. Klinisch findet sich keine Wirksamkeit der Medikamente, dagegen zeigen interessanterweise die histologischen Befunde bei der Acetylsalicylsäuregruppe eine verminderte Abstoßungsreaktion.
    Notes: Summary The effects of anti-thrombotic drugs—Acetyl-salicylic-acid and 2-Piperazinyl-4-thiomorpholino-pyrido(3,2-d)-pyrimidin-sulfat-trihydrat—on rejection reactions of renal allografts in dogs have been studied. From the clinical point of view no effectiveness of the two drugs can be found, whereas the histological findings do clearly show diminished rejection reactions in the Acetylsalicylic-acid group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01856451
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  • 3
    Electronic Resource
    Electronic Resource
    A note on FEM buckling analysisThis paper is dedicated to R. L. Taylor on the occasion of his 60th birthday. (1995)
    Chichester : Wiley-Blackwell
    Communications in Numerical Methods in Engineering 11 (1995), S. 149-158 
    Details
    ISSN: 1069-8299
    Keywords: FEM ; stability analysis ; algorithms ; shell structures ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The investigation of the non-linear response of shell-like structures requires insight into stability behaviour. In the paper we compare two strategies to compute singular points based on different eigenvalue problems. We show a simple algorithm to calculate critical load factors A used in engineering buckling analysis from the eigenvalues of the standard eigenvalue problem (KT - ω1) ϕ = 0. Some numerical examples illustrate the derived results and algorithms.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cnm.1640110208
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  • 4
    Electronic Resource
    Electronic Resource
    A finite element model for non-linear shells of revolution with finite rotations (1990)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 29 (1990), S. 1455-1471 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The axisymmetric behaviour of geometrically non-linear elastic shells of revolution with finite rotations is discussed. In contrast to the approach of Reissner and to standard classical shell theories a new straightforward strategy is derived for the formulation of fully non-linear strain measures in the axisymmetric case. Within this approach the computation of the deformed director vector d is a main assumption which is essential to describe the fully non-linear bending behaviour. A Total Lagrangian Description is chosen to represent the large displacements. As an illustrative example the finite element formulation for a simple two-node conical element is given. A consistent linearization of the weak form leads to a quadratically convergence behaviour. The discussed shell examples under proportional loading show the good performance of the derived finite element formulation.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620290706
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  • 5
    Electronic Resource
    Electronic Resource
    105. Neue Magnetschwebewaagen für gravimetrische Messungen in der Verfahrenstechnik (1993)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 1116-1117 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.3306509107
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  • 6
    Electronic Resource
    Electronic Resource
    Some experiments on bulk polymerization of vinyl chloride (1952)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 9 (1952), S. 581-585 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1952.120090616
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  • 7
    Electronic Resource
    Electronic Resource
    Correlation of hydrogen content with properties of oxidic thin films (1992)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 19 (1992), S. 435-438 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Hydrogen and hydrogen-containing species (H2O, OH etc.) play a dominant role in the various properties of glass surfaces and technical oxidic thin films deposited on glass. The amount of hydrogen and its distribution with depth are influenced by preparation and production processes, film materials, density and voids, etc. The 15N nuclear reaction technique, which works quantitatively and non-destructively, was used to investigate glass surfaces and thin films of TiO2, Ta2O5 and SiO2 produced by sol-gel processes, reactive evaporation, sputtering and ion plating on glass substrates. An increase or decrease in hydrogen content influences optical and mechanical properties such as the refractive index and adhesion of the films.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740190181
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  • 8
    Electronic Resource
    Electronic Resource
    In-depth profiling of hydrogen in oxidic multilayer systems (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 16 (1990), S. 331-334 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The hydrogen concentration profiles of electrochromic multilayer systems produced by evaporation have been determined by means of nuclear reaction analysis. The H content of individual oxidic materials was found to be larger than for single films, especially for SiO2. The time-dependent H uptake under various ambient conditions was investigated. Systems produced by ion plating were also profiled for hydrogen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740160170
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  • 9
    Electronic Resource
    Electronic Resource
    Detecting symmetry-breaking bifurcation points of symmetric structures (1993)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 36 (1993), S. 3019-3039 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: In engineering applications often problems with symmetric system and symmetric loading occur. It is well known that these symmetry conditions can be used to reduce the computational effort. Thus, only a symmetric reduced system is treated with sufficient boundary and loading conditions. Especially for non-linear problems this procedure is very effective. Such a strategy allows the computation of solution paths with the constraint that the solution has to be symmetric. Consequently in a stability analysis, only limit points and bifurcation points with associated symmetrical eigenvectors can be found. Often the stability behaviour is dominated by symmetry-breaking bifurcation points which cannot be detected considering only the tangent stiffness matrix of the reduced system. Hence, in case of stability considerations a calculation of the complete system is necessary. This paper introduces a special form of stability analysis of the complete system using only certain matrices known from the symmetric reduced system, and some transformations concerning the topology of the total system. The proposed methods base on a substructure technique for symmetry under reflections and rotations, and are formulated for the finite element method. Numerical examples are given to show the efficiency of the proposed procedures and algorithms.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620361710
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  • 10
    Electronic Resource
    Electronic Resource
    A new boundary-type finite element for 2-D- and 3-D-elastic structures (1994)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 37 (1994), S. 1009-1025 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: In this paper we discuss the theoretical and numerical formulation of 3-D Trefitz elements. Starting from the variational principle with the so-called hybrid stress method, the trial functions for the stresses have to fulfil the Beltrami equations, which means also the compatibility equations for the strains. The divergence theorem can be applied, and one arrives at a pure boundary formulation in the sense of the Trefftz method. Besides the resulting variational formulation, different regularizations of the interelement conditions are investigated by numerical tests. Two examples show the numerical efficiency of the derived elements. First, a geometric linear 3-D example is presented to show the effects on distorted element meshes. The third example shows the geometrically non-linear analysis of a shallow cylindrical shell segment under a singe load.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620370608
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