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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 527-529 (Oct. 2006), p. 1489-1492 
    ISSN: 1662-9752
    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
    Notes: Cubic GaN, AlxGa1-xN/GaN and InyGa1-yN/GaN multiple quantum well (MQW) layerswere grown by plasma assisted molecular beam epitaxy on 200 &m thick free standing 3C-SiCsubstrates. The influence of the surface roughness of the 3C-SiC substrates and the influence ofmetal coverage during growth are discussed. Optimum growth conditions of c-III nitrides exist,when a one monolayer Ga coverage is formed at the growing surface. The improvement of thestructural properties of cubic III-nitride layers and multilayers grown on 3C-SiC substrates isdemonstrated by 1 μm thick c-GaN layers with a minimum x-ray rocking curve width of 16 arcmin,and by c-AlGaN/GaN and c-InGaN/GaN MQWs which showed up to five satellite peaks in X-raydiffraction, respectively
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1262
    Keywords: Keywords MRI ; Abdomen ; Crohn’s disease ; Inflammatory small bowel disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Conventional enteroclysis remains the method of choice in the diagnosis of inflammatory small bowel disease. The reported sensitivity rates, however, for the diagnosis of extraintestinal processes, such as fistulae and abscesses, are moderate. Computed tomography (CT) is the method of choice for the diagnosis of extraintestinal complications. The anatomical designation of the affected bowel segment may, however, prove difficult due to axial slices, and the applied radiation dose is high. The use of magnetic resonance imaging (MRI) in the diagnosis of inflammatory small bowel disease is a relatively new indication for the method; prerequisites were the development of breathhold sequences and phased array coils. Optimized magnetic resonance tomographic imaging requires a combined method of enteroclysis and MRI, which guarantees an optimal filling and distension of the small bowel. The high filling volume leads to a secondary paralysis of the small bowel and avoids motion artifacts. In a trial of 84 patients with histological and endoscopic correlation the sensitivity in diagnosing inflammatory bowel disease was 85.4% for enteroclysis and 95.2% for MRI, and the specificity was 76.9% for enteroclysis and 92.6% for MRI. As none of the abscesses was diagnosed with enteroclysis, the sensitivity was 0% for enteroclysis, but 77.8% for MRI. The sensitivity in diagnosing fistulae was 17.7% for enteroclysis and 70.6% for MRI. In summary, MRI can detect the most relevant findings in patients with inflammatory small bowel disease with an accuracy superior to that of enteroclysis.
    Type of Medium: Electronic Resource
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