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  • Articles: DFG German National Licenses  (15)
  • 2000-2004  (12)
  • 1985-1989  (3)
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  • Articles: DFG German National Licenses  (15)
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  • 1
    Electronic Resource
    Electronic Resource
    Nonlinear waves in a low-β plasma with cylindrical symmetry (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 4780-4783 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The "Sagdeev potential" is derived from the magnetohydrodynamic equations in a cylindrical coordinate system, and nonlinear electrostatic density waves propagating along the magnetic field in a low-β plasma with cylindrical symmetry are studied. The results show the existence not only of periodic density waves, solitons with a density hump and solitons with a density dip, but also of density shock waves. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1409959
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Properties and structures of diamond-like carbon film deposited using He, Ne, Ar/methane mixture by plasma enhanced chemical vapor deposition (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 8122-8131 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Diamond-like carbon (DLC) films have been deposited by a magnetically enhanced plasma (MEP) chemical vapor deposition (CVD) system. The properties and structures of DLC films deposited by MEP-CVD using various gases (methane, He/methane, Ne/methane, and Ar/methane) were studied. The mechanical properties in terms of hardness, Young's modulus and stress, and optical properties in terms of optical band gap and refractive index were enhanced by adding inert gas in methane plasma. The magnitude of the effects on the properties for various inert gases was found as Ne, Ar, and He, on the surface roughness was found as Ar, Ne, and He. The Raman characteristic shows a dependence of the bias voltage and inert-gas/methane ratio, as well as the inert gases dilution. The Raman spectroscopy analysis indicates that the changes of properties of the DLC films are due to the structural changes, such as sp2 and sp3 content in the films prepared under various deposition conditions. The films deposited in Ne/methane show the lowest disordered (D) peak to graphitic (G) peak intensity ratio, the D and G peak positions; highest stress, hardness, Young's modulus, optical band gap, and lowest reflective index. The films deposited in Ar/methane show the lowest surface roughness. This was proposed due to the optimum balance in the inert gas ionization potential and atomic mass. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373507
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Arginyl-tRNA synthetase from Escherichia coli, purification by affinity chromatography, properties, and steady-state kinetics (1988)
    s.l. : American Chemical Society
    Biochemistry 27 (1988), S. 6343-6348 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00417a022
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The interaction between platinum films and silicon substrates: Effects of substrate bias during sputtering deposition (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 1679-1683 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The reactions between platinum and silicon, both during platinum deposition at elevated temperature and during a thermal annealing process, have been investigated using x-ray diffraction, cross-sectional transmission electron microscopy, and x-ray photoelectron spectroscopy. It has been found that sputtering deposition of platinum on a silicon substrate at 200 °C results in the formation of PtSi at the Pt–Si interface. But the reaction cannot fully proceed at this temperature for a platinum film with a thickness of 35 nm. Further annealing at 450 °C causes the platinum film to transform to PtSi completely. A substrate bias of −90 V during sputtering deposition leads to the formation of platinum films with larger columnar grains, instead of finer grains as being formed without substrate bias. In such a case, oxygen diffusion toward the interface was enhanced through the boundaries of these columnar grains, and this results in an accumulation of oxygen and oxide formation at the interface. As a result, the reaction between platinum and silicon was inhibited during the further annealing process for the Pt/Si films deposited with substrate bias. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373871
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of different types of threading dislocations on the carrier mobility and photoluminescence in epitaxial GaN (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 2293-2295 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-resolution x-ray diffraction has been used to analyze the type and density of threading dislocations in a series (0001)-oriented GaN epitaxial film. Photoluminescence (PL) and carrier mobility of the films are measured at room temperature. The intensities of both the band edge (3.42 eV) peak and yellow luminescence (YL) are strongly related to the threading dislocation density of the GaN films. But different types of dislocations show different relationship with the intensities of PL and YL. The fundamental correlation is found not only between the interaction of edge- and screw-type dislocations and the carrier mobility but also between the interaction and the intensities of both the band edge peak and the YL. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1465531
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  • 6
    Electronic Resource
    Electronic Resource
    A functional polymorphism in the promoter region of the cyclooxygenase-2 gene is not associated with asthma and atopy in an Australian population (2004)
    Oxford, UK : Blackwell Science Ltd
    Clinical & experimental allergy 34 (2004), S. 0 
    Details
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background Cyclooxygenase (COX)-2 is a key inducible enzyme that regulates the production of anti-inflammatory prostaglandin E2. A single-nucleotide polymorphism, −765G〉C, located within a stimulatory protein-1 binding site in the COX-2 promoter region, has been shown to have significantly lower promoter activity in vitro compared with the wild-type and was associated with decreased plasma levels of C-reactive protein after coronary artery bypass surgery. We hypothesized that this polymorphism, which may result in decreased COX-2 transcription, could be associated with more severe asthma, and/or aspirin-intolerant asthma (AIA).Objective To determine the association between the −765G〉C COX-2 polymorphism and asthma, disease severity and AIA in a large, well-phenotyped Australian population.Methods PCR and restriction fragment length polymorphism analysis was used to characterize the polymorphism in an Australian Caucasian population of patients with mild (n=322), moderate (n=254) or severe (n=88) asthma and in non-asthmatic control subjects (n=512), as well as in patients with AIA (n=58). Genotype and allele association analyses were performed using χ2 tests.Results The polymorphic −765C allele was present in approximately 30% of asthmatic patients and non-asthmatic controls. There was no association between the −765G〉C polymorphism and asthma (P=0.920), disease severity (P=0.840), atopy (P=0.655) or AIA (P=0.841) in this population.Conclusion Although the −765G〉C polymorphism may have lower promoter activity and result in decreased COX-2 expression, it is not associated with asthma, disease severity, AIA or atopy in this Australian population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2222.2004.02094.x
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Coarse resolution large-eddy simulation of turbulent channel flows (2001)
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 11 (2001), S. 20-35 
    Details
    ISSN: 0961-5539
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper two important factors - the subgrid model length scale and lateral resolution - are investigated for the large-eddy simulation (LES) of high Reynolds number turbulent channel flow using resolutions that are insufficient to fully resolve the buffer layer. It is found that the use of standard damping functions will not reproduce correct mean velocity profiles and that good LES results will only be obtained by adjustment of the subgrid model length scales. To also obtain accurate turbulence statistics then special attention has to be given to the lateral resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09615530110364060
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  • 8
    Electronic Resource
    Electronic Resource
    A product driven approach to manufacturing supply chain selection (2002)
    Bingley : Emerald
    Supply chain management 7 (2002), S. 189-199 
    Details
    ISSN: 1359-8546
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: A supply chain consists of suppliers, manufacturers, distributors, and customers, all linked together with a forward flow of material and backward flow of information. It encompasses all activities associated with the flow and transformation of goods from raw material extraction through end use. Supply chain management is the integration of critical aspects of strategy formulation, marketing, operations, and distribution. A critical aspect of supply chain management is the selection of an appropriate type of supply chain to achieve optimal performance. This paper classifies manufacturing supply chains into three types; namely, lean, agile, and hybrid. The characteristics of these supply chains are presented. It is proposed that the selection of an appropriate type of supply chain should be driven by the characteristic of product an organization is manufacturing. A model is then developed and implemented to assist organizations in supply chain selection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/13598540210438935
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  • 9
    Electronic Resource
    Electronic Resource
    Microstructure, microhardness, composition, and corrosive properties of stainless steel 304 II. Low-pressure laser spraying with silicon. (2000)
    Springer
    Applied physics 70 (2000), S. 651-656 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.15.FG; 81.15.Rs; 81.65.Kn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Clad layers of silicon on a SUS 304 substrate were obtained by low-pressure laser spraying (LPLS) to investigate their microstructure, microhardness, composition, and corrosive properties. When an impinged energy density was adjusted to be 32 to 95 W mm-2, the silicon concentration of the surface of clad layers was estimated as 5 to 8 wt.%. For as-prepared layers, their crystal structure was a single phase of alpha-ferrite with no distinct corrosion resistance, because partially segregated Si atoms along the grain boundaries and inside the grains were selectively dissolved in the etching process. After solution-annealing for 2 h, the corrosion resistance was greatly improved in hydrochloric acid solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050009
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  • 10
    Electronic Resource
    Electronic Resource
    Microstructure, microhardness, composition, and corrosive properties of stainless steel 304 I. Laser surface alloying with silicon by beam-oscillating method. (2000)
    Springer
    Applied physics 70 (2000), S. 395-402 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.15.FG; 61.82.Bg; 81.65.Kn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Laser surface alloying (LSA) with silicon was conducted on austenitic stainless steel 304. Silicon slurry composed of silicon particle of 5 μm in average diameter was made and a uniform layer was supplied on the substrate stainless steel. The surface was melted with beam-oscillated carbon dioxide laser and then LSA layers of 0.4–1.2 mm in thickness were obtained. When an impinged energy density was adjusted to be equal to or lower than 100 W mm−2, LSA layers retained rapidly solidified microstructure with dispersed cracks. In these samples, Fe3Si was detected and the concentration of Si in LSA layer was estimated to be 10.5 wt.% maximum. When the energy density was equal to or greater than 147 W mm−2, cellular grained structure with no crack was formed. No iron silicate was observed and alpha iron content in LSA layers increased. Si concentration within LSA layers was estimated to be 5 to 9 wt.% on average. Crack-free as-deposited samples exhibited no distinct corrosion resistance. The segregation of Si was confirmed along the grain boundaries and inside the grains. The microstructure of these samples changed with solution-annealing and the corrosion resistance was fairly improved with the time period of solution-annealing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051055
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