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  • Electronic Resource  (18)
  • 1990-1994  (8)
  • 1985-1989  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Performance characteristics of a microwave plasma source using an axial mirror and multipole magnetic fields (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1932-1938 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The performance characteristics of a microwave plasma source are presented. The plasma source consists of two chambers: chamber 1 generates a high-density plasma over which a magnetic field is applied at electron cyclotron resonance condition or greater, and chamber 2 makes the plasma uniform in its lower region by surrounding the peripheral region with magnetic multipole line-cusp fields. Plasma parameters were measured with a movable Langmuir probe located 1 cm above a plasma grid which is attached at the bottom of chamber 2. The dependence of plasma parameters on the magnetic field configuration, gas pressure and microwave power were examined, and radial distributions were measured. Uniform high-density plasmas over a 9-cm-diam area were produced on the plasma grid in a suitable magnetic field configuration, and uniformity was maintained over a wide pressure range. The uniform density region was determined by the magnetic multipole fields existing in chamber 2's peripheral region. The ion beam current density evaluated from the extracted ion beam correlated well with the ion saturation current density estimated from the plasma parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143307
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  • 2
    Electronic Resource
    Electronic Resource
    Spontaneous formation of magnetohydrodynamic equilibrium profiles: Tokamaks, reversed-field pinches, and their intermediates (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 2465-2469 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spontaneous formation of magnetohydrodynamic (MHD) equilibrium profiles in toroidal current-carrying plasmas has been discussed for tokamaks, reversed-field pinches (RFP's), and also for their intermediate states ultra-low q's (ULQ's). The significance of m (poloidal mode number)=1 fluctuations causing a shift of the magnetic axis is stressed. The characteristics of MHD relaxation have been studied in comparison with classical diffusion. The dynamics of ULQ's is shown to illustrate the characteristics of both dissipative processes. A global-mode stable ULQ is observed to be produced through MHD relaxation, and then to be deformed, in a longer time scale, by classical diffusion which destabilizes the stable profile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866085
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Development of a beam probing system for measurement of density, temperature, and magnetic field of RFP plasma (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 530-535 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A hydrogen beam probing system developed for the REPUTE-1 reversed field pinch device is described. With this system, the plasma ion line density, the central ion temperature, and the magnetic field profile can be measured. Before being applied to the REPUTE-1 device, the probing system was tested on the TORIUT-5 tokamak and TORIUT-6 ultralow-q (ULQ) devices. The experimental results show the availability of the system. The measured line density agrees well with that measured by the microwave interferometry. The measurable density ranges from 1019 m−3 to 3×1020 m−3. A new method of magnetic field measurement which is effective and important for RFP plasmas is proposed. The resolution and the accuracy of this measurement have been confirmed by experiments on the TORIUT-5 device. Experimental results agree well with computation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139264
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    In situ observation of molecular beam epitaxy of GaAs and AlGaAs under deficient As4 flux by scanning reflection electron microscopy (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 622-624 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The initial stages of molecular beam epitaxial (MBE) growth of GaAs and AlGaAs are directly observed by scanning reflection electron microscopy. Under deficient As4 flux, it is shown that dark areas appear within several layers of growth, but disappear within several seconds of growth interruption, indicating that they are droplets of Ga and Al. The distance between the droplets is approximately 1 μm, which is identical in GaAs and AlGaAs growth. Thus, the diffusion length of Ga and Al on a group III-rich surface at around 600 °C is estimated to be about 5000 A(ring), which is the largest among previous reports. The role of droplet disappearance in interface flattening in alternating supply MBE is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101829
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  • 5
    Electronic Resource
    Electronic Resource
    In situ observation by ultrahigh vacuum reflection electron microscopy of terrace formation processes on (100) silicon surfaces during annealing (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1400-1402 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Formation processes of terraces on (100) silicon surfaces during annealing at 1000 °C were observed in situ by ultrahigh vacuum reflection electron microscopy. Terraces were formed on staircases made up of monoatomic steps, preferentially at the sites where stairs were larger than average. The sites are formed by surface undulation. It was found that the terrace grew, or extended, in both up-step and down-step directions almost at equal rates. The terrace thus grew not by sublimation, but by adhesion and removal of atoms at respective terrace edges. Thus, the interlayer migration of adatoms plays an important role in the terrace growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101606
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of scanning deep level transient spectroscopy (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1617-1619 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fundamental processes such as charge generation, trapping and emission, and collection in scanning deep level transient spectroscopy (SDLTS) are analyzed. It is concluded that SDLTS is more sensitive to minority-carrier traps than to majority-carrier traps and that a two-dimensional map of SDLTS peak signal magnitude, i.e., SDLTS image, of minority-carrier traps does not necessarily show the trap concentration distribution. A practical equation for trap concentration is derived by utilizing an electron beam induced current. Concentration of a hole trap with an activation energy 0.45 eV in an n-type as-grown liquid encapsulated Czochralski GaAs is calculated to be 1×1016 cm−3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98573
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  • 7
    Electronic Resource
    Electronic Resource
    Electrical and photoadsorptive properties of valence-controlled .alpha.-iron hydroxide oxide (1989)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 93 (1989), S. 1988-1992 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100342a056
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  • 8
    Electronic Resource
    Electronic Resource
    Morphology of molecular beam epitaxy grown NiAl on GaAs studied by scanning tunneling microscopy (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 69-71 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Extended terraces, steps along the 〈110〉 directions, and trenches between the terraces were observed on 100 nm thick NiAl films grown on GaAs by molecular beam epitaxy at 600 °C. Atomically smooth surfaces as large as 100 nm across could be obtained at this growth temperature, but at 450 °C, mounds rather than terraces were formed. We propose models for the formation of these features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109699
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  • 9
    Electronic Resource
    Electronic Resource
    A comparative immunohistochemical study of calcineurin and S-100 protein in mammalian and avian brains (1988)
    Springer
    Experimental brain research 69 (1988), S. 645-650 
    Details
    ISSN: 1432-1106
    Keywords: S-100 protein ; Calcineurin ; Mammalian brain ; Avian brain ; Vertebrate brain ; Immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The cellular and topographic localization of calcineurin and S-100 protein was examined immunohistochemically in the mammalian and avian brain. Calcineurin immunoreactivity in both the avian and mammalian brain was located only in neuronal cells. S-100 protein was localized mainly in the glial and Schwann cells within the mammalian brain. However, in the avian brain, neuronal cells in certain regions such as the paleostriatum primitivum and the cerebellum, as well as other non-neuronal cells, exhibited S-100 protein immunoreactivity. A distinct difference was demonstrated in the macroscopic topographic distribution patterns of S-100 protein immunoreactivity between the mammalian and avian brains, while the patterns of calcineurin distribution were essentially identical. In addition, we provided calcineurin- and S-100 protein-immunocytochemical results for the turtle, frog and fish brain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00247316
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  • 10
    Electronic Resource
    Electronic Resource
    HighT c of YBa2Cu3O x implanted N2 (1990)
    Springer
    Journal of materials science 9 (1990), S. 253-254 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00725815
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