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  • 1990-1994  (6)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Specific resistivity of ohmic contacts to n-type direct band-gap III-V compound semiconductors (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 282-287 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Contact resistivity curves are given in terms of intrinsic barrier height and doping level for ohmic contacts to n-type direct band-gap III-V semiconductor compounds, including AlxGa1−xAs. The results are based on a rigorous treatment of carrier transport across the metal-semiconductor interface. They show that the resistivity behaves quite differently from what might be expected from the usual notion of the effects of doping and barrier height on the resistivity. As such, the results can be used as a useful guide in attempts to lower the contact resistivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350297
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structures of quinone imine metabolites related to the anti-cancer drug amsacrine (1993)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 342-347 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768192009169
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Object-oriented programming for engineering applications (1991)
    Springer
    Engineering with computers 7 (1991), S. 225-235 
    Details
    ISSN: 1435-5663
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The object-oriented programing (OOP) methodology is introduced as a means for improving the management of a complex engineering software. The drawbacks of existing engineering software development techniques are pinpointed. The basic concepts of the OOP methodology are interpreted in the context of engineering applications. The familiar concept of a matrix is used as an example to interpret the ideas presented. It is concluded that the OOP methodology facilitates the management of complex engineering software systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01206364
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A creep apparatus to explore the quenching and ageing phenomena of PVC films (1991)
    Springer
    Journal of materials science 26 (1991), S. 1-5 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A creep apparatus has been constructed for anin situ determination of length and length change. Using this apparatus, the creep behaviour of PVC thin films associated with quenching and ageing was studied. The more severe the quench through the glass transition temperature (T g), the greater is the instantaneous elastic deformation and the subsequent creep behaviour. As ageing proceeds, the quenched films gradually lose the ductility incurred by quenching. These results agree well with the well-known phenomena of physical ageing. Thus, the changes reflecting molecular mobilities due to quenching and ageing can be properly monitored by such a creep apparatus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00576023
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of slip-casting and dry-pressing on structure evolution of alumina compacts (1992)
    Springer
    Journal of materials science 27 (1992), S. 6673-6678 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A commercial alumina powder was processed to remove aggregates and agglomerates for the study of processing influence on sintering behaviour and structure evolution. Slip-casting a uniformly dispersed slurry formed green compacts with homogeneous particle packing, which subsequently resulted in a nearly defect-free microstructure upon sintering. Dry-pressing the granules that possessed a similar homogeneous microstructure led to compacts with larger voids and particle-packing inhomogeneity. The inhomogeneity persisted through sintering and evolved voids with a size of about 6 μm. However, under the same sintering condition, the sintered density of the dry-pressed compact approached that of the slip-cast compact. The grain sizes of both sintered compacts were similar, implying that differences in consolidation effectiveness do not necessarily incur variation in grain growth provided the compacts are prepared from the same starting powder and sintered under the same condition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01165953
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of gabergic anthelmintics at higher concentrations on the guanidine-induced twitch responses in isolated frog recturs preparations (1994)
    Springer
    Parasitology research 80 (1994), S. 575-580 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Effects of various gabergic anthelmintics on the guanidine-induced twitch responses in isolated frog rectus preparations were examined. All gabergic anthelmintics such as milbemycin oxime, milbemycin D, avermectin B1a, invermectin, and diethylcarbamazine (DEC) showed stimulatory effects on the guanidine-induced twitch responses at their higher concentrations. Only piperazine caused inhibitory effects on the twitch responses, even at higher concentrations. The stimulation of the twitch responses by the gabergic anthelmintics was antagonized with tetrodotoxin, hemicholinium-3, dtubocurarine, and strychnine. These results suggest that all gabergic anthelmintics except piperazine stimulate the release of acetylcholine from the nerve endings and that all of them, including piperazine, have different effects on the gabergic mechanism at lower concentrations and on the cholinergic mechanism at higher concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00933005
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    Paper (German National Licenses)
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