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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 56 (1991), S. 5962-5964 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-601X
    Keywords: 23.60. +e ; 23.90. +w ; 27.60. +j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In fusion reactions of58Ni beams with54Pe and58Ni target nuclei neutron deficient evaporation residues have been produced and separated from the beam in an electrostatic deflector with large acceptance. The recoil nuclei were implanted and detected in an array of 100 PIN photodiodes, where also their particle decays were recorded. The assignment of the 0.81 MeV proton line to the decay of109I could be experimentally proven by the observation, that it is followed by the 3.31 MeV alpha emission from108Te. A proton decay from112Cs was not observed. The decay energies of a number of known α emitters have been measured with better precision.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 81 (1994), S. 553-554 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 81 (1994), S. 553-554 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Archive of applied mechanics 62 (1992), S. 474-486 
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Es wird eine Biegetheorie dünner Schalen bei finiten Deformationen sowie die zugehörige Finite-Element-Formulierung vorgestellt. Die kinematischen Annahmen sind vom Reissner-Mindlin-Typ. Die Darstellung basiert auf der Einführung eines gemischten Funktionals mit unabhängigen Drehfreiheitsgraden in der Schalenmmittelfläche und einem schiefsymmetrischen Anteil der Membrankräfte. Die resultierenden Euler-Lagrange-Gleichungen ergeben das Gleichgewicht und die Symmetrie der Schnittgrößen. Weiterhin ergibt sich die Gleichheit des unabhängigen mit dem verschiebungsabhängigen Rotationsfeld. Die Entwicklung des Vier-Knoten-Schalenelementes enthält somit auch den Drehfreiheitsgrad um die Schalenormale. Für das Verschiebungsfeld wird ein Allman-Ansatz gewählt.
    Notes: Summary A bending theory for thin shells undergoing finite deformations is presented, and its associated finite element model is described. The kinematic assumptions are of Reissner-Mindlin type. The formulation is based on the introduction of a mixed functional with independent in-plane rotation field and skew-symmetric part of membrane forces. The resulting Euler-Lagrangian equations yield the equilibrium of stress resultants and the couple resultant with respect to the surface normal. Furthermore, the equality of the independent rotation field with the displacement dependent rotation field is enforced. Hence, the symmetry of the stress resultants is fulfilled in a weak sence. Naturally, the development of a quadrilateral finite element includes drilling degrees of freedom. The displacement field is approximated using an Allman-type interpolation.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Computational mechanics 13 (1993), S. 175-188 
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A numerical model for layered composite structures based on a geometrical nonlinear shell theory is presented. The kinematic is based on a multi-director theory, thus the in-plane displacements of each layer are described by independent director vectors. Using the isoparametric apporach a finite element formulation for quadrilaterals is developed. Continuity of the interlaminar shear stresses is obtained within the nonlinear solution process. Several examples are presented to illustrate the performance of the developed numerical model.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Computational mechanics 5 (1990), S. 428-446 
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In the analysis of nonlinear elastic shells often the stability and postbuckling behaviour governs the response. Here we discuss problems which also include contact constraints. A nonlinear cylindrical shell element is derived directly from the associated shell theory using one point integration and a stabilization technique. Within a general solution algorithm a simple but effective branch-switching procedure is presented. Additional considerations allow the treatment of bifurcation problems with contact constraints. Several examples of beam and shell problems show the performance of the developed algorithms and elements.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 117 (1991), S. 568-574 
    ISSN: 1432-1335
    Keywords: Heterotransplantation ; Nude mice ; Osteosarcoma ; Squamous carcinoma ; Histological changes ; Biological behaviour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Fifteen xenograft tumour lines (4 osteosarcomas and 11 squamous carcinomas) were established on nude mice in numerous passages. Over a period of 4 years, samples were taken and studied systematically in more than 4000 histological slides. Of the tumour lines, 12 (4 osteosarcomas and 8 squamous carcinomas) showed remarkable dedifferentiation, but also redifferentiation towards a higher grade. There was a correlation between the rate of tumour takes in mice and poor prognosis in patients, but none between tumour doubling time and the phases of the cell cycle. Altogether, the results showed a great heterogeneity of human xenotransplants in terms of biological behaviour and morphological changes.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 116 (1990), S. 315-317 
    ISSN: 1432-1335
    Keywords: Multiclonal tumor ; Irradiation ; Flow cytometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary It was shown in the present study that irradiation of a multiclonal tumor may destroy near-diploid cell clones preferentially, while the stemline with high DNA content continues to grow after temporary arrest. This experimental observation confirms recent clinical studies.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of orofacial orthopedics 55 (1994), S. 202-208 
    ISSN: 1615-6714
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Fortythree out of 148 patients who had undergone velopharyngeal flap graft between 1980 and 1992 to treat velopharyngeal insufficiency, and for whom pre- and postoperative data were available, were studied for the purpose of determining the long term morphological functional results of the treatment. Almost all of the 43 patients (93,5%) had received a velopharyngeal flap graft according toSanvenero-Rosselli. The remaining 4.7% had received a velopharyngeal adhesion according toStellmach. Four physicians from the fields of oral surgery, orthodontics, phoniatries, and logopedies evaluated the pre- and postoperative data as well as the results of the follow-up examination according to subjective criteria from their respective disciplines. All four physicians judged that following velopharyngeal flap graft a gradual improvement in the ability to speak had been achieved in 86% of the patients in the follow-up study. At the time of the follow-up examination 70% of these cases were judged to have achieved a “good” qualitative level of articulation and 21% were judged to have achieved a “usefull” level. The best results were obtained in patients who had been operated on before the age of six. The reason is that in these young patients muscular malfunction and pathological movement patterns can be more easily modified than in okler patients. In many cases additional speech improvement was achieved through logopedical therapy following the velopharyngeal flap graft. In the most difficult cases intensive therapy while the patients were still hospitalized proved to be especially effective. The pre-operative use of transnasal flexible endoscopy to evaluate the interaction of the structures bearing on velopharyngeal closure proved its value in evaluating velopharyngeal flap graft's chances of success. Velopharyngeal flap graft thus offers the possibility of an efficacious treatment of velopharyngeal insufficiency, if both the preoperative diagnosis and postoperative therapy draw on the expertise of the above noted fields in an interdisciplinary common effort in which the limits of the treatment method are clearly taken into consideration.
    Notes: Zusammenfassung Von 148 Patienten, bei denen im Zeitraum von 1980 bis 1992 wegen einer velopharyngealen Insuffizienz eine Velopharyngoplastik durchgeführt wurde sowie prä- und postoperative Befunde vorlagen, wurden 43 Betroffene zur Einschätzung der morphologischen und funktionellen Spätresultate nachuntersucht. Bei 95,3% aller nachuntersuchten Patienten wurde eine Velopharyngoplastik nachSanvenero-Rosselli [15] und bei 4,7% eine Velopharynxadhäsion nachStellmach [19] durchgeführt. Die prä- und postoperative Beurteilung sowie die Nachuntersuchung erfolgten dabei nach subjektiven Kriterien durch Fachvertreter der Kieferchirurgie, Kieferorthopädie, Phoniatrie und Logopädie. Bei 86% der nachuntersuchten Patienten konnte nach Beurteilung aller Fachvertreter eine graduelle Sprachverbesserung mit einer Velopharyngoplastik erreicht werden. Zum Zeitpunkt der Nachuntersuchung war die Sprachqualität in 70% der Fälle gut und bei 21% branchbar beurteilt worden. Bei einer sprachverbessernden Operation vor dem sechsten Lebensjahr wirden die besten Ergebnisse erreicht, da zu diesem Zeitpunkt muskuläre Fehlfunktionen und pathologische Bewegungsmuster noch leichter umgestellt werden können. Eine weitere Verbesserung der Sprachqualität konnte in vielen Fällen durch eine logopädische Übungsbehandlung nach der Velopharyngoplastik erzielt werden. Die stationäre Intensivtherapie hat sich besonders bei schweren Fällen bewährt. Zur Abschätzung der Erfolgsaussichten einer Velopharyngoplastik hat sich die präoperative transnasale flexible Endoskopie zur Beurteilung des Zusammenspiels der am velopharyngealen Verschluß beteiligten Strukturen bewährt. Bei einer sachgerechten Indikationsstellung und effektiven Behandlung unter kritischer Berücksichtigung der Grenzen dieser Methodik in interdisziplinärer Zusammenarbeit ist die Velopharyngoplastik eine gute Möglichkeit zur Behandlung der velopharyngealen Insuffienz.
    Type of Medium: Electronic Resource
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