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  • 1985-1989  (7)
  • 1989  (7)
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  • 1985-1989  (7)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Radiation-induced formation of cavities in amorphous germanium (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 2494-2496 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Prethinned polycrystalline Ge TEM samples were irradiated with 1.5 MeV Kr+ ions at room temperature while structural and morphological changes were observed in situ in the Argonne High Voltage Electron Microscope-Tandem Facility. After a Kr+ dose of 1.2×1014 ions/cm2, the irradiated Ge was completely amorphized. A high density of small void-like cavities was observed after a Kr+ dose of 7×1014 ions/cm2. With increasing Kr+ ion dose, these cavities grew into large holes transforming the irradiated Ge into a sponge-like porous material after 8.5×1015 ions/cm2. The radiation-induced nucleation of void-like cavities in amorphous material is astonishing, and the final structure of the irradiated Ge with enormous surface area may have potential applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102009
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Low-resistance nonspiking ohmic contact for AlGaAs/GaAs high electron mobility transistors using the Ge/Pd scheme (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2677-2679 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nonspiking (nonalloyed) Ge/Pd ohmic contact formed via solid phase reaction on an AlGaAs/GaAs high electron mobility transistor (HEMT) was investigated. The surface morphology of the Ge/Pd contact is smooth and planar with a typical contact resistivity of about 3×10−7 Ω cm2. The current-voltage characteristics of the HEMTs with the Ge/Pd contacts are similar to those with the conventional AuGe/Ni spiking (alloyed) contacts. Since only a thin substrate surface layer of 100–200 A(ring) was reacted with the Ge/Pd contact, we can conclude that ohmic contacts can be made to the two-dimensional electron gas without deep penetration of the metallization. This observation is in agreement with the concept that transport due to tunneling is significant across heterojunctions. The Ge/Pd contact may be potentially useful in HEMT integrated circuit technology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101032
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The temperature dependence of contact resistivity of the Ge/Pd and the Si/Pd nonalloyed contact scheme on n-GaAs (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 1621-1625 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of the contact resistance of the Ge/Pd and Si/Pd metalization scheme on n-GaAs was investigated. These two contact systems are based on solid-phase reactions, thus leading to nonspiking ohmic contacts to n-GaAs. The experimental results show that the ohmic behavior is likely due to both a highly doped surface n+ region and/or a small barrier at the interface. The origin of this small barrier and nonlinear current-voltage characteristics for certain samples are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342954
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Wide range magnetic electron spectrograph (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1233-1238 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An electron spectrograph is described that covers electron energies from 400 eV to 200 keV with an energy resolution of 10%. This overlaps the range of electrostatic deflection devices at low energy and solid state detectors at high energy. The spectrograph uses magnetic deflection of the electrons to achieve energy separation and images the full range of energies on a single plane. The magnetic circuit uses the fringing field of two axially located magnets to attain the large energy range. Six separate electron beams can be dispersed in the field, each entering the circuit from a different angle. This is a particular advantage when measuring plasma electron three-dimensional velocity distributions. The angular response of the instrument is particularly favorable and the stray magnetic field is sufficiently low to meet spacecraft requirements. Compared with electrostatic deflection devices, the spectrograph is particularly advantageous for measuring high energy electron plasma velocity distribution functions with fast time resolution at modest energy resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140296
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Stability of plasmas sustained by ion cyclotron wave excitation in the central cell of the Tara tandem mirror (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 851-861 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stability of plasmas produced by radio-frequency heating in the ion cyclotron frequency range (ICRF) has been studied in the central cell of the Tara tandem mirror [Nucl. Fusion 22, 549 (1982); Plasma Physics and Controlled Nuclear Fusion Research 1986, Proceedings of the 11th International Conference, Kyoto (IAEA, Vienna, 1987), Vol. II, p. 251]. Ion cyclotron wave excitation by a slot antenna provided stability against macroscopic plasma motions in an axisymmetric configuration. The maintenance of macroscopic stability depended on the ICRF power, gas fueling rate, ion cyclotron resonance location, and ω/ωci at the antenna location. The ICRF ponderomotive force model is consistent with many of the observed stability features and predicts that the E+ component of the ion cyclotron wave was responsible for the stabilization. The Alfvén ion cyclotron microinstability was observed when the plasma β⊥ and anisotropy were sufficiently high. Magnetic probe measurements of the unstable mode identified it as an ion cyclotron wave and the instability threshold was within a factor of 2 of the theoretical value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859010
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The anti-inflammatory effects of LY178002 and LY256548 (1989)
    Springer
    Inflammation research 27 (1989), S. 300-302 
    Details
    ISSN: 1420-908X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract LY178002 (5-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methylene-4-thiazolidinone) and its N-methyl analog, LY256548, inhibit the enzymatic activity of phospholipase A2, 5-lipoxygenase and fatty acid cycloxygenase. They also inhibit leukotriene B4 production from human polymorphonuclear leukocytes stimulated with the calcium ionophore A23187. Since products of the arachidonic acid cascade have been implicated as important mediators in a variety of inflammatory diseases including arthritis, LY178002 and LY256548 were studied in the Freund's Complete Adjuvant-Induced Arthritis (FCA) model in rats. The compounds were administered orally and inhibition of bone damage and paw swelling was assessed of both the injected and uninjected paws. At 50 mg/kg LY178002 inhibited soft tissue swelling in the uninjected paw by 81% while LY256548 exhibited 57% inhibition. Bone damage was also significantly inhibited by both compounds. A dose response was conducted. The minimum effective dose for LY178002 was 10 mg/kg p.o. In the established FCA model LY178002 at 50 mg/kg p.o. inhibited the uninjected paw swelling by 75% while LY256548 did not show this level of activity. These results suggest that LY178002 and LY256548 may be useful in the treatment of arthritis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01972804
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    High-resolution electron microscopy study of belite (1989)
    Springer
    Journal of materials science 24 (1989), S. 877-880 
    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 The microstructures of belite examined by high-resolution electron microscopy (HREM) show the (1 0 0) and (0 0 1) twin lamellae which are introduced by shear stresses during the transformation ofα′−C2S toβ-C2S.γ-C2S formed in the larnite was identified and the orientation relationship between them was also determined by a composite electron diffraction pattern (EDP), which is different from that suggested earlier by Groves. The EDP and the HREM image showed the existence of the unstable phaseα′ L−C2S.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01148771
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    Paper (German National Licenses)
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