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  • 1
    Electronic Resource
    Electronic Resource
    Zeolitic Tuffs as Raw Materials for Lightweight Aggregates (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 264-268 (May 2004), p. 1431-1434 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.264-268.1431.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Three-dimensional (3D) contrast-enhanced power Doppler imaging in Legg-Calvé-Perthes disease (2000)
    Springer
    Pediatric radiology 30 (2000), S. 871-874 
    Details
    ISSN: 1432-1998
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background. The revascularization process of the femoral head in Legg-Calvé-Perthes disease has not been well studied on Doppler images. We incorporated two relatively new developments in ultrasound: 3D power Doppler imaging combined with the use of contrast agents.¶Patients and methods. We studied two children with unilateral Legg-Calvé-Perthes disease through anterior-sagittal approaches with pre- and post-contrast power Doppler images, acquired in 2D and 3D planes.¶Results. In one patient, intraosseous vessels were detected only in the pathological femoral head both pre- and post-contrast administration. In the other, no flow was identifiable without the use of contrasts.¶Conclusion. The use of ultrasound contrast agents combined with 3D imaging modalities offers new alternative methods for visualization of intraosseous vascularity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002470000323
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Doppler demonstration of cystic vein dilatation secondary to portal vein thrombosis (1991)
    Springer
    Surgical endoscopy and other interventional techniques 5 (1991), S. 92-93 
    Details
    ISSN: 1432-2218
    Keywords: Doppler ; Dilated cystic veins ; Cirrhosis ; Gallstones ; Portal vein thrombosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary High-resolution duplex ultrasound was used to demonstrate vascular dilatation in the gallbladder wall in eight patients with portal vein thrombosis. Gallbladder thickening, combined with a higher incidence of gallstone disease in patients with chronic hepatic disease can be misinterpreted as acute cholecystitis. The Doppler is helpful in detecting the vascular cause of the gallbladder wall thickening thus helping to reduce the frequency of inappropriate cholecystectomy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00316845
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    L.D.V. analysis of wakes behind circular cylinders and airfoils (1981)
    Springer
    Meccanica 16 (1981), S. 220-231 
    Details
    ISSN: 1572-9648
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Summary Stream velocity fluctuations in the wake behind a circular cylinder and behind an airfoil has been investigated. Experiments were performed in a water tunnel equipped with a laser doppler velocimeter connected with a real time spectrum analyzer. The airfoil was tested in the range of Reynolds numbers between 4000 and 12000 for various incidence angles. The results of the tests proved: a) a linear relationship between Reynolds and Roshko numbers at constant incidence angles; b) Roshko number versus incidence angle presents a maximum at constant Reynolds number; the maximum is reached for an incidence angle near 0°. Moreover, Roshko number assumes a nearly constant trend for high positive and high negative incidence angles. Comparisons with results from other authors have been made, showing actually a good agreement.
    Notes: Sommario Le fluttuazioni di velocità nella scia a valle di corpi cilindrici, a sezione circolare e a profilo alare, inseriti in un tunnel idrodinamico, sono state analizzate mediante un velocimetro laser doppler collegato ad un analizzatore di spettro in tempo reale. Le prove sul profilo alare sono state effettuate per numeri di Reynolds compresi tra 4000 e 12000 e per vari angoli di incidenza. I risultati, in accordo con quanto ottenuto da altri sperimentatori, mostrano: a) ad incidenza costante, una relazione lineare tra i numeri di Roshko e di Reynolds; b) a parità di numero di Reynolds il numero di Roshko presenta un massimo per incidenza vicina allo zero e per alti angoli d'incidenza positivi e negativi un andamento pressoché costante.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02128324
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  • 5
    Electronic Resource
    Electronic Resource
    FDTD analysis of crosstalk in multilayer printed circuits (1994)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal of Numerical Modelling: Electronic Networks, Devices and Fields 7 (1994), S. 209-221 
    Details
    ISSN: 0894-3370
    Keywords: Engineering ; Electrical and Electronics Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: A theoretical analysis has been developed to study the crosstalk in crossed bundles of parallel lines. The model is based on the theory of the coupled transmission lines and the resulting system of differential equations has been solved by means of the finite difference, time-domain (FDTD) method. The frequency response of the network has been achieved by the discrete fourier transform (DFT) algorithm; measurements, performed with a vectorial network analyser, show a good agreement with numerical simulation.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jnm.1660070308
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    Paper (German National Licenses)
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