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  • Articles: DFG German National Licenses  (24)
  • 2000-2004  (1)
  • 1990-1994  (11)
  • 1980-1984  (12)
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  • Articles: DFG German National Licenses  (24)
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Years
Year
  • 11
    ISSN: 0942-0940
    Keywords: End to side anastomosis ; flow patterns ; rheological study
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Flow property measurements were performed in a plexiglass model of six various types of end-to-side anastomosis (as clinically shown in extracranial to intracranial arterial bypass surgery). Three anastomoses were made without, another three anastomoses with a ringshaped stenosis restricting the lumen to between 25 and 46% of the cross-section as it occurs clinically by formation of thrombi out of the stitching canals. A rectangular type and two 45 degree oblique types—one directed centrally and one directed peripherally—were tested. Pressure head losses at the site of anastomosis were measured under various circumstances of different anastomoses and different flow speeds along the proximal portion of the middle cerebral artery and the superficial temporal artery. Flow resistance values originated by the different types of anastomoses were expressed in terms of additional recipient vessel length. Differences between different types of anastomoses with and without stenosis were very small and under no circumstances exceeded the equivalent of lengthening the recipient vessel by 2 cm. Theoretically, the optimal type of anastomosis is the oblique and centrally directed version; the worst type is the rectangular form. Practically, however, such differences are not relevant. The explanation for such unexpectedly small differences can rheologically be given by considering the dominating role of blood viscosity under the given circumstances, other variables such as short stenosis and angling of flow playing a secondary role.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 27 (1984), S. 115-117 
    ISSN: 1432-1041
    Keywords: benzodiazepine antagonist ; Ro 15-1788 ; healthy volunteers ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of the selective benzodiazepine antagonist Ro 15-1788 has been studied in 6 healthy male volunteers following a single intravenous dose of 2.5 mg. The drug was only slightly bound to plasma proteins (40±8%, mean±SD). A negligible amount (〈0.2% of the dose) of unchanged drug was recovered in urine. Hepatic elimination was rapid, as shown by a short t1/2 of 0.9±0.2 h, and high total plasma and blood clearances of 691±216 ml/min and 716±199 ml/min, respectively. The fast decline of plasma levels from about 60 to 2 ng/ml accounts for the short-lasting reversal of benzodiazepine-induced sedation by Ro 15-1788.
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 27 (1984), S. 115-117 
    ISSN: 1432-1041
    Keywords: benzodiazepine antagonist ; Ro 15-1788 ; healthy volunteers ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of the selective benzodiazepine antagonist Ro 15-1788 has been studied in 6 healthy male volunteers following a single intravenous dose of 2.5 mg. The drug was only slightly bound to plasma proteins (40±8%, mean±SD). A negligible amount (〈0.2% of the dose) of unchanged drug was recovered in urine. Hepatic elimination was rapid, as shown by a short t1/2 of 0.9±0.2 h, and high total plasma and blood clearances of 691±216 ml/min and 716±199 ml/min, respectively. The fast decline of plasma levels from about 60 to 2 ng/ml accounts for the short-lasting reversal of benzodiazepine-induced sedation by Ro 15-1788.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 11 (1992), S. 1685-1686 
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Sozial- und Präventivmedizin 26 (1981), S. 146-147 
    ISSN: 1420-911X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé L'action du plomb sur le métabolisme intermédiaire, spécialement sur la synthèse de l'hème, est bien connue. Par voie de conséquence, la surveillance biologique des personnes exposées au plomb qui recourt au dosage urinaire des métabolites urinaires de la porphyrine est tout à fait fondée. La surveillance biologique par le dosage du métabolite urinaire de l'acide delta-amino-lévulinique est pratiquée depuis plus de dix ans sur une vaste échelle par la Caisse nationale suisse d'assurance en cas d'accidents. Aujourd'hui, plus de 3000 travailleurs dans une centaine d'usines sont périodiquement surveillés de cette manière. Les analyses urinaires sont pratiquées à des intervalles réguliers de 2, 4 ou 6 mois selon le degré de l'exposition au plomb; on y ajoute un examen médical une à deux fois par année. Grâce à la surveillance biologique, aux améliorations techniques et à l'hygiène personnelle, on n'a pas observé de cas d'intoxications au plomb ces dernières années.
    Abstract: Summary The action of lead on the intermediary metabolism, especially on the synthesis of heme, the red blood cell pigment, is well documented. Therefore biological monitoring of lead exposed persons by means of the urinary metabolites of porphyrin metabolism is very valuable. Biological monitoring through the urinary metabolite — aminolevulinic acid (ALAU) has been put to extensive use for over ten years by the Swiss National Accident Insurance Fund (Suva). At present there are over 3000 workers in 100 factories which are periodically screened for this metabolite. Urinary analyses are carried out at regular intervals of 2, 4 or 6 months according to the lead exposition with additional medical examinations once or twice a year. Due to biological monitoring, technical improvements and personal hygiene there have been no further lead poisoning recently in industrial plants supervised by Suva.
    Notes: Zusammenfassung Aufgrund der gut untersuchten Wirkung des Bleis auf den Intermediärstoffwechsel, insbesondere auf die Bildung des roten Blutfarbstoffes, eignen sich die anfallenden Metaboliten des Porphyrinstoffwechsels in besonderer Weise für die biologische Überwachung von bleiexponierten Personen. Dies wurde in den letzten zehn Jahren von der Suva genutzt und hat dazu beigetragen, das Problem der Bleivergiftung in den überwachten Industriebetrieben weitgehend zu eliminieren.
    Type of Medium: Electronic Resource
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  • 16
    ISSN: 1434-9949
    Keywords: Synovitis ; Acute Leukenia ; Leukemic Synovitis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We report one case of leukemic synovitis in a patient with a 40-year history of rheumatoid arthritis. The synovial fluid sample and synovial biopsy specimen showed myeloblastic cells. So, leukemic synovitis can be suspected in a patient with inflammatory rheumatism and adequate diagnostic procedures should be carried out.
    Type of Medium: Electronic Resource
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  • 17
    ISSN: 1434-6079
    Keywords: 34.80.Gs ; 34.50.Ez ; 34.50.Pi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Angularly resolved pure rotational excitation of sodium dimers by intermediate energy electrons (150 to 300 eV) is studied using laser state selection technique, under nonresonant collision conditions. The experimental procedure, which is new to electron scattering, is described in detail. The experimental data show large rotational transitions and rotational rainbow structures. The relative cross sections agree well with the close coupling calculations and also with the spectator model predictions.
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 107-108 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 19
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Siliciumnitrid: Gefüge, Eigenschaften und neue HerstellungsverfahrenAnhand der Korrelation zwischen einigen wichtigen Gefügeparametern und verschiedenen mechanischen, thermischen und thermomechanischen Eigenschaften von heißgepreßtem und reaktionsgesintertem Siliciumnitrid wird die Forderung nach einer weiteren Verbesserung der Eigenschaften und nach einer ökonomischeren Herstellung von Siliciumnitrid durch Anwendung neuer Verfahren aufgezeigt. Die Aussichten und Probleme bei den verschiedenen neuen Verfahren, dem Sintern von verdichteten Si3N4 - Pulverkörpern, dem Nachsintern von reaktionsgesintertem Siliciumnitrid und den verschiedenen Methoden des heißisostatischen Pressens, werden diskutiert.Die Arbeit ist in 2 Teile unterteilt:Teil I: Einfluß des Gefüges auf die mechanischen, thermischen und thermomechanischen Eigenschaften von Siliciumnitrid.Teil II: Neue Herstellungsverfahren von Siliciumnitrid.In Teil I wird der Zusammenhang zwischen Gefüge und verschiedenen mechanischen, thermischen und thermomechanischen Eigenschaften von heißgepreßtem und reaktionsgesintertem Siliciumnitrid diskutiert, wie Bruchfestigkeit, Temperaturleitfähigkeit und Thermoschockverhalten. Aufbauend auf dieser Korrelation werden die heutigen Grenzen von Siliciumnitrid für eine breitere Anwendung sowie die Möglichkeiten für eine Optimierung dieser Materialgruppe dargelegt. Diese Diskussion zeigt sehr deutlich, daß es notwendig ist, einige wichtige Eigenschaften weiter zu verbessern und neue Herstellungsverfahren zu entwickeln. In Teil II der Arbeit werden die Entwicklungsrichtungen dieser neuen Herstellungsverfahren für Siliciumnitrid aufgezeigt. Es wird ein Überblick über die in jüngster Zeit erzielten Fortschritte bei der Anwendung dieser Verfahren gegeben. Als Beispiel für ein neues Herstellungsverfahren werden Ergebnisse vom heißisostatischen Pressen von reaktionsgesintertem Siliciumnitrid diskutiert.
    Notes: Based on the correlation of some essential microstructural parameters and various mechanical, thermal and thermo-mechanical properties of hot-pressed and reaction-bonded silicon nitride, the demand for further improving the properties of silicon nitride and for developing a more economical fabrication of silicon nitride by applying new processing techniques is indicated. Aspects and problem areas of various new techniques, such as sintering of Si3N4-powder compacts and post-sintering of reaction-bonded silicon nitride as well as the various routes of hot-isostatic pressing, are discussed. The paper is divided into two parts:Part I: Microstructural effects on mechanical, thermal and thermomechanical properties of silicon nitride.Part II: New processing techniques of silicon nitride.In part I the relationship between microstructure and various mechanical, thermal and thermo-mechanical properties of hot-pressed and reaction-bonded silicon nitride, such as fracture strength, thermal diffusivity and thermal shock resistance, is discussed. On the basis of this correlation today's limits of silicon nitride regarding a broader application, and the possibilities for optimizing this material group are outlined. This discussion demonstrates the necessity of further improving some important properties and of developing new processing techniques. In part II the development lines of these new techniques for silicon nitride processing are discussed and a survey is given of recent progresses in the use of those techniques. As an example of a new processing technique, results of hot-isostatic pressing of reaction-bonded silicon nitride are presented in more detail.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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  • 20
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Teil II: Neue Herstellungstechniken von SiliciumnitridIn Teil I wurde der Zusammenhang zwischen Gefüge und verschiedenen mechanischen, thermischen und thermomechanischen Eigenschaften von heißgepreßtem und reaktionsgesintertem Siliciumnitrid diskutiert, wie Bruchfestigkeit, Temperaturleitfähigkeit und Thermoschockverhalten. Aufbauend auf dieser Korrelation wurden die heutigen Grenzen von Siliciumnitrid für eine breitere Anwendung sowie die Möglichkeiten für eine Optimierung dieser Materialgruppe dargelegt. Diese Diskussion zeigt sehr deutlich, daß es notwendig ist, einige wichtige Eigenschaften weiter zu verbessern und neue Herstellungs-techniken zu entwickeln. In Teil II der Arbeit werden die Entwicklungsrichtungen dieser neuen Herstellungstechniken für Siliciumnitrid aufgezeigt. Es wird ein Überblick über die in jüngster Zeit erzielten Fortschritte bei der Anwendung dieser Techniken gegeben. Als Beispiel einer neuen Herstellungstechnik werden Ergebnisse vom heißisostatischen Pressen von reaktionsgesintertem Siliciumnitrid diskutiert.
    Notes: In part I of this paper the relationship between microstructure and various mechanical, thermal and thermo-mechanical properties of hot-pressed and reaction-bonded silicon nitride, such as fracture strength, thermal diffusivity and thermal shock resistance, was discussed. On the basis of this correlation today's limits of silicon nitride regarding a broader application and the possibilities for optimizing this material group were outlined. This discussion demonstrates the necessity of further improving some important properties and of developing new processing techniques. In part II the development lines of these new techniques for silicon nitride processing are discussed and a survey is given of recent progresses in the use of those techniques. As an example of a new processing technique, results of hot-isostatic pressing of reaction-bonded silicon nitride are presented in more detail.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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