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  • 1
    Electronic Resource
    Electronic Resource
    Enhanced nitrogen diffusion in 4H-SiC (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 228-230 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental evidence is given for boron (B) enhanced diffusion of nitrogen (N) in ion-implanted 4H silicon carbide (4H-SiC), when a nitrogen implant is co-doped within an existing boron p-type well. The co-implanted nitrogen is shown to diffuse continuously with time when samples are annealed at 1600 °C—with little movement of the boron p-well implant profile. An effective nitrogen in boron diffusivity at 1600 °C is determined to be at least 60 times larger than that of a mono-doped nitrogen implant. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1432451
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  • 2
    Electronic Resource
    Electronic Resource
    Observation and Modelling of Preferred Orientation in Two-Dimensional Powder Patterns (1996)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 3 (1996), S. 112-119 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A novel approach to the detection and modelling of preferred orientation is presented, based on the interpretation of two-dimensional powder patterns. A simple graphical construction is introduced to aid interpretation, and the application of this construction to some standard diffraction geometries is discussed. It is also shown in outline how a standard preferred-orientation model can be adapted to describe two-dimensional data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049596003627
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of the buoyant density of canine distemper virus by radioassay (1975)
    Springer
    Archives of virology 47 (1975), S. 319-329 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Canine distemper virus was labelled with tritiated uridine and, following precipitation with saturated ammonium sulphate solution, was concentrated 66-fold by centrifugation through a discontinuous sucrose gradient. When this preparation was centrifuged to equilibrium in density gradients of potassium tartrate or sucrose, radioactivity was distributed over the density range 1.218 to 1.180 with a pronounced peak at around 1.195. This corresponded closely to the distribution of infectivity and also to that of virus particles revealed by electron microscopy. In density gradients of caesium chloride, a plateau of radioactivity was present over the density range 1.26 to 1.24 with a peak at around 1.240 but most of the infectivity was limited to the range of 1.24 to 1.22. Since the amount of infectious virus recovered from potassium tartrate was greater than that recovered from the other two materials and the radioactive peak occurred over a narrower density range, it was concluded that potassium tartrate was the material of choice for the isopycnic centrifugation of canine distemper virus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01347972
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Changes in atrial natriuretic factor and plasma renin activity in dogs infected withTrypanosoma brucei (1992)
    Springer
    Parasitology research 78 (1992), S. 553-556 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract When beagle dogs were infected withTrypanosoma brucei, a marked reduction in the plasma concentration of atrial natriuretic factor (ANF) occurred in the terminal stage of the disease during weeks 3 and 4. At the same time there was an increase in plasma renin activity (PRA) after infection. Ultrastructural studies of the atria of these dogs demonstrated a reduction in ANF granules. The changes in ANF and PRA occurred in association with severe pancarditis and the development of heart failure. By impairing the ability of the heart and kidneys to regulate blood volume, the alterations in ANF and PRA could be involved in the pathogenesis of heart failure inT. brucei-infected dogs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00936451
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  • 5
    Electronic Resource
    Electronic Resource
    Comparison of two solution strategies for use with higher-order discretization schemes in fluid flow simulation (1988)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 8 (1988), S. 1203-1215 
    Details
    ISSN: 0271-2091
    Keywords: Unsegregated ; Multigrid ; High-order ; Finite-difference ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The paper describes and compares two different approaches to solving the equations of motion for fluid flow in a three-dimensional lid-driven cavity, when a higher-order approximation to convective transport is employed. One is based on the traditional pressure correction approach in conjunction with a pentadiagonal ADI solver; the other follows a new unsegregated variable and FAS multigrid methodology. The results generated by both approaches, for laminar flow conditions, at Reynolds numbers of 100 and 1000 are compared with each other and with corresponding solutions obtained with a well known low-order approximation to convection. Cross-reference is also made to flow in a two-dimensional cavity at the same Reynolds numbers.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650081008
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  • 6
    Electronic Resource
    Electronic Resource
    Natural convection in a shallow laterally heated air-filled cavity (1995)
    Chichester : Wiley-Blackwell
    Communications in Numerical Methods in Engineering 11 (1995), S. 937-950 
    Details
    ISSN: 1069-8299
    Keywords: thermal convection ; slender multigrid ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The flow in a shallow, laterally heated air-filled cavity is investigated numerically using a primitive variable formulation of the governing equations of motion. Solutions are obtained for the entire flow field using a coupled solver combined with an FAS non-linear multigrid convergence accelerator. While care is taken to use a high-order, bounded discretization scheme for convective transport, the overall stability and efficiency of the approach is enhanced through the use of defect correction. This combination of features enables solutions to be found on extremely fine grids. Results for the flow in the end region of such cavities are compared qualitatively with the predictions of asymptotic theory for large aspect ratio, A (length:height), up to values of A higher than previously reported (A= 100); the particular case of A = 20 is considered for Rayleigh numbers in the range 103 to 108. Finally it is demonstrated how such solutions can be further enhanced by using locally refined grids in the end regions.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cnm.1640111108
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