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  • Engineering General  (4)
  • Computed tomography  (2)
  • General Chemistry  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Langenbeck's archives of surgery 361 (1983), S. 755-756 
    ISSN: 1435-2451
    Schlagwort(e): Thymoma ; Thymushyperplasia ; Computed tomography ; Thymom ; Thymushyperplasie ; Computertomographie.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung In der Diagnostik mediastinaler Tumoren spielt die thorakale Computertomographie mit der Differenzierungsmöglichkeit zwischen retrostemalem Fett, Thymusgewebe und Thymom eine zentrale Rolle. Wegen der Übersichtlichkeit und Radikalität bei der Entfernung eines Thymoms aber auch der zu fordernden ausgedehnten Thymektomie im Falle der Thymushyperplasie ist die mediane Sternotomie operativer Zugangsweg der Wahl. Für die Prognose ist der intraoperative Nachweis von invasivem Wachstum von entscheidender Bedeutung.
    Notizen: Summary Computed axial tomography plays an essential role in the diagnosis of mediastinal tumors. It can differentiate between retrosternal fat, thymic tissue and thymoma. A median stemotomy is the operative approach of choice. It provides optimal access to the mediastinum which is a prerequisite in the radical removal of a thymoma as well as in the surgical treatment of thymus hyperplasia which we believe has to be treated by radical thymectomy. The prognosis mainly depends on whether invasion of adjacent structures was present at the time of operation or not.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Langenbeck's archives of surgery 361 (1983), S. 913-913 
    ISSN: 1435-2451
    Schlagwort(e): Myastenia gravis ; Thymectomy ; Computed tomography ; Myasthenia gravis ; Thymektomie ; Computertomographie
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Bei Patienten mit Myastenia gravis wird die Häufigkeit einer Thymushyperplasie mit 65%, von Thymustumoren mit 8–28% angegeben. Da sich selbst ein eindeutig veränderter Thymus dem klinischen Nachweis entziehen kann, hat die thorakale Computertomographie einen hohen diagnostischen Stellenwert. Die Indikation zur Thymektomie besteht bei erwachsenen Myastheniepatienten im computertomographischen Nachweis von Thymusgewebe. Für die zu fordernde komplette Entfernung des Thymusgewebes bevorzugen wir die mediane Sternotomie. Neurologische Nachbehandlung ist notwendig.
    Notizen: Summary Among patients suffering from myasthenia gravis, thymic hyperplasia can be found in 65% and a tumor in 8%–28%. Clinical diagnosis can be difficult. Therefore, computed axial tomography is of great diagnostic importance. There is increasing evidence that a thymectomy should always be performed if thymic tissue can be shown by CAT scan to be present in the anterior mediastinum. As operative treatment we prefer a median sternotomy, which makes it easier to remove the thymus completely. Postoperatively the patients should be under neurological surveillance.
    Materialart: Digitale Medien
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  • 3
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 63 (1951), S. 28-28 
    ISSN: 0044-8249
    Schlagwort(e): Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 36 (1993), S. 3019-3039 
    ISSN: 0029-5981
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: 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.
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 36 (1923), S. 19-20 
    ISSN: 0044-8249
    Schlagwort(e): Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Chichester : Wiley-Blackwell
    Communications in Numerical Methods in Engineering 11 (1995), S. 149-158 
    ISSN: 1069-8299
    Schlagwort(e): FEM ; stability analysis ; algorithms ; shell structures ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: 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.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 29 (1990), S. 1455-1471 
    ISSN: 0029-5981
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: 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.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 37 (1994), S. 1009-1025 
    ISSN: 0029-5981
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: 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.
    Zusätzliches Material: 14 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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