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  • 1
    Electronic Resource
    Electronic Resource
    The Novolever: A new cantilever for scanning force microscopy microfabricated from polymeric materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 3702-3706 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new force sensor element based on multilayer thin film technology and adapted for optical readout in a conventional scanning force microscope has been developed. The use of polymers as cantilever materials enables the introduction of mechanical properties otherwise not accessible with microfabrication based on Si technology. The fully batched fabricated cantilevered force transducer is based on the photoresist novolak and incorporates an integrated EBD tip. Bending experiments on microstructures indicate that the Young's modulus of novolak is about two orders of magnitude lower than for Si. Therefore, in using a cantilever design similar to that with Si it is possible to fabricate more flexible structures from polymeric materials. The new force sensors have been tested and their performance has been evaluated on different samples. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144495
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  • 2
    Electronic Resource
    Electronic Resource
    The product composition regions of single-feed azeotropic distillation columns (1992)
    s.l. : American Chemical Society
    Industrial & engineering chemistry research 31 (1992), S. 2345-2362 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie00010a014
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  • 3
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1994)
    Springer
    OR spectrum 16 (1994), S. 248-248 
    Details
    ISSN: 1436-6304
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01720316
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  • 4
    Electronic Resource
    Electronic Resource
    Die dringliche Pankreatektomie bei der akuten Pankreatitis (1971)
    Springer
    Langenbeck's archives of surgery 328 (1971), S. 314-327 
    Details
    ISSN: 1435-2451
    Keywords: Pancreatitis ; Surgery ; Acute Pancreatitis ; Pancreatectomy ; Acute Pancreatitis-Complications
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Das Studium von 17 Fällen, bei denen eine Frühpankreatektomie durchgeführt wurde, bestimmt wie folgt unser therapeutisches Verhalten: Bei der akuten postoperativen Pankreatitis sind wir angesichts des schwerwiegenden Krankheitsverlaufes überzeugt von der Notwendigkeit einer frühzeitig durchzuführenden ausgedehnten Pankreatektomie. Bei der akuten primären Pankreatitis sind wir etwas zurückhaltender, da selbst bei offener Bauchhöhle das Schicksal gewisser Pankreaspartien nicht mit Sicherheit vorhergesagt werden kann. Dennoch bestimmen unsere im Vergleich mit den Literaturangaben günstigen persönlichen Erfahrungen mit der Pankreatektomie unser aktives chirurgisches Vorgehen bei der akuten nekrotisierenden hämorrhagischen Pankreatitis.
    Notes: Summary The study of 17 cases of acute pancreatitis, in whom early total or subtotal pancreatic resection were performed, has led to the following therapeutic principles: the serious nature of acute post-operative pancreatitis has convinced us of the necessity for early intervention and as extensive a resection as possible; 5 out of 6 patients were cured in this way. In case of acute primary pancreatitis we are more conservative since even at laparotomy it is difficult to foresee the fate of all parts of the pancreas. Nevertheless our relatively favorable results led us to intervene surgically if the signs and symptoms of pancreatitis do not show any improvement after 8 to 12 h. If acute, diffuse pancreatitis affects the whole organ subtotal pancreatectomy is performed. If the head of the pancreas is affected we confine ourselves to the removal of necroses. Duodenopancreatectomy does not seem justified in the acute phase; only 1 out of 3 patients survived this procedure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01237507
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  • 5
    Electronic Resource
    Electronic Resource
    Experimentelle und klinische Untersuchungen zur Pathophysiologie der Nierenarterienstenose * (1976)
    Springer
    Langenbeck's archives of surgery 340 (1976), S. 147-158 
    Details
    ISSN: 1435-2451
    Keywords: Renal artery stenosis - Fluid mechanics ; pathophysiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In der vorliegenden experimentellen und klinischen Untersuchung wird die Auswirkung der Nierenarterienstenose auf die poststenotische Durchblutung der Niere dargestellt und beurteilt. Es wird gezeigt, daß der Anteil des Durchblutungswiderstandes einer mittelgradig stenosierten Niere am Gesamtwiderstand gering ist. Die periphere durch die Stenose induzierte Widerstandserhöhung ist das wesentliche Merkmal in der Pathophysiologie der Nierenarterienstenose und der hierdurch bedingten Druckerhöhung. Sie tritt zunächst auf der stenosierten, dann auch auf der nichtstenosierten Seite auf und kann durch den Renin-Angiotensin-Mechanismus erklärt werden. Die Nierendurchblutung kann durch Beseitigung der experimentellen Nierenarterienstenose normalisiert werden. Analog ist die Nierendurchblutungsminderung durch Beseitigung der Stenose im Anfangsstadium der klinischen Nierenarterienstenose zu beheben. Der induzierte arterielle Hochdruck geht zurück. Da der Widerstand im Initialstadium wesentlich. auf die erkrankte Niere beschränkt ist, kann der Gesamtwiderstand für beide Nieren nur gering erhöht sein. Bei höherem Widerstand beider Nieren ist eine Gefäßveränderung im peripheren Gefäßabschnitt gegeben. Eine Beseitigung der Stenose kann nicht mehr zur Reduktion des arteriellen Hochdrucks führen. Dies läßt sich anhand der Daten unseres Krankengutes nachweisen. Die kritische Grenze für die Indikation zum operativen Vorgehen scheint vorzuliegen, wenn der Globalwiderstand für beide Nieren einen Wert von 0,25 mm Hg/ml min−1 überschritten hat.
    Notes: Summary The effect of renal artery stenosis on the poststenotic hemodynamics is demonstrated and evaluated in the presented experimental and clinical investigation. It is shown that the resistance of a medium sized stenosis is small compared to the total renal resistance. The peripheral resistance which is induced by the stenosis is the essential characteristic in the pathophysiology of the renal artery stenosis and the resulting hypertension. The increasing pressure can be measured primarily in the stenosed artery and later also in the not stenosed side and is seen as an effect of the renin-angiotensin-mechanism. The renal artery flow returns to normal after removal of the experimental stenosis. Likewise the reduction in renal artery flow is normalized by resection of the stenosis in the initial phase of the clinical renal artery stenosis. The induced hypertension is reversed to normal. Since the resistance in the initial phase is essentially limited to the stenosed side the global renal resistance is only little increased. Increased total renal resistance is due to morphological changes in the peripheral vessels. The removal of the stenosis will not be followed by a decrease in blood-pressure. This is to be seen in the data of our clinical cases. The critical limit for an effective operation followed by a decrease in artery pressure is to be seen in a total renal resistance of over 0.25 mm Hg/ml min−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01254852
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  • 6
    Electronic Resource
    Electronic Resource
    Observations of 50-MHz type-II coherent echoes from within the polar cap (1994)
    Springer
    Annales geophysicae 12 (1994), S. 765-774 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract 50-MHz type-II coherent echoes at geometrical aspect angles of 11.5○ have been observed in the northern polar cap during pre-noon hours. The echoes had an unusually large Doppler width of 1200–1400 m s−1 and were well correlated with strong magnetic disturbances in the range 500–1000 nT. The dependence of intensity, spectral width and skewness versus radial velocity were similar to those known from previous experiments at lower latitudes and at small aspect angles. It is concluded that echo onset was due to the combination of several factors, including a highly conducting ionosphere, the presence of a very intense electric field, and strong radar wave refraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-994-0765-1
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic resonance of a single molecular spin (1993)
    [s.l.] : Nature Publishing Group
    Nature 363 (1993), S. 242-244 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sublimation-grown single crystals of /?-terphenyl containing 10 7-10 8 mol/mol pentacene were cooled to 1.5K. As described in detail previously7, fluorescence excitation of single pentacene molecules in these samples was achieved by focusing a narrow-band single-mode laser to a spot of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/363242a0
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of the third velocity component with PTA using an intensity graded light sheet (1992)
    Springer
    Experiments in fluids 13 (1992), S. 357-359 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A new method for the determination of the velocity field with all three velocity components in a light sheet was demonstrated that combines conventional particle tracking anemometry (PTA) with an intensity analysis of the particle flecks. The correlation between intensity and the dimension perpendicular to the light sheet was obtained from the monotonous variation of the laser light intensity across the width of the light sheet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00209511
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  • 9
    Electronic Resource
    Electronic Resource
    In-plane determination of 3D-velocity vectors using particle tracking anemometry (PTA) (1994)
    Springer
    Experiments in fluids 17 (1994), S. 105-109 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A PTA-technique for the in-plane determination of the three flow velocity vector components based on the defocused imaging of stray-particles has been investigated. The conventional setup for 2-D PTA has been modified by broadening the laser light-sheet to a width of approximately 1.5 mm and focusing the imaging optics in a plane in front of the laser light-sheet. Particles in the light-sheet are imaged out of focus and the image size of a particle therefore depends on its distance to the focal plane of the imaging optics. The increase of the particle image diameter within single particle tracks due to the defocusing was used to determine the velocity component perpendicular to the light-sheet. The results obtained with this technique in a well defined laminar air flow are in good agreement with LDV-data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02412811
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  • 10
    Electronic Resource
    Electronic Resource
    Biomechanics of valvular plane displacement of the heart (1991)
    Springer
    Basic research in cardiology 86 (1991), S. 572-581 
    Details
    ISSN: 1435-1803
    Keywords: Biomechanics ; valvular planedisplacement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary There has been no consensus concerning the particular movement of the valvular plane of the heart (VPM). As shown in this study involving a mathematical model based upon the momentum equation and experiments on a specially designed artificial heart pump, the VPM not only results from the shortening of the heart, but also from blood flow within the heart and large blood vessels, from the forces caused by the muscle movements, and from the elastic properties of the heart's suspension. The results of the calculations and the experiments confirm the effect of the so-called valve mechanism and its influence on the economic beating action of the heart.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02190708
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