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  • 1990-1994  (11)
  • 1
    Electronic Resource
    Electronic Resource
    Studies of an expansion-type tandem rf bucket source (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1256-1258 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new rf source producing a large and uniform plasma with magnetic field-free geometry for neutral beam has been developed. The source consists of a small-diameter multiple-rf plasma generator and a bucket chamber as a plasma expansion section. The plasma density scaling, the spatial profile, and the ion beam extraction have been studied by using the single rf plasma generator. It was found that under the optimized conditions the plasma density and the profile in the expanded plasma were essentially ruled by qualities of the bucket chamber itself. The present rf source is promising for the application of large-volume positive-ion source or plasma processing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141221
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Studies of an expansion-type tandem rf bucket source : International conference on ion sources (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 398-400 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new rf source producing a large and uniform plasma with magnetic field-free geometry for neutral beam has been developed. The source consists of a small-diameter multiple-rf plasma generator and a bucket chamber as a plasma expansion section. The plasma density scaling, the spatial profile, and the ion beam extraction have been studied by using the single rf plasma generator. It was found that under the optimized conditions the plasma density and the profile in the expanded plasma were essentially ruled by qualities of the bucket chamber itself. The present rf source is promising for the application of large-volume positive-ion source or plasma processing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141303
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Control of hydrocarbon radicals and film deposition by using a whistler wave discharge in range of radio frequency (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 2675-2677 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Production of hydrocarbon radicals is controlled by using a whistler wave discharge in range of radio frequency in a low pressure region (∼0.1 Pa). Plasma density of 1010–1013 cm−3, electron temperature of 2–20 eV is obtained for the discharge of the admixture of Ar and small content of source gases (CH4, C2H2, CO). Spectroscopic measurement indicates that densities of CH and H radicals and the deposition rate of amorphous carbon:H film increase with electron density, electron temperature, and source gas pressure. The etching effect of H atoms influences on the deposition rate and a high deposition rate (90 μm/h for CO/Ar discharge) is obtained even in a low neutral pressure discharge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105903
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Density fluctuations and confinement in the Nagoya Bumpy Torus (NBT-1M) (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 1052-1058 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stabilization of low-frequency density fluctuations is evidenced in the Nagoya Bumpy Torus (NBT-1M) [Plasma Physics and Controlled Nuclear Fusion Research (IAEA, Vienna, 1985), Vol. 2, p. 551] in the presence of microwave-heated hot-electron rings. Flute-type fluctuations, which are considered to be stabilized by the charge-uncovering effect of the rings, are found to cause large plasma losses, and to affect radial density profiles in the way that the lower fluctuation level yields the steeper density gradient. The particle confinement is, therefore, improved by the hot-electron rings to some extent, but is mainly determined by the plasma convection, which is expected from the discrepancy between density and potential profiles. It is also found that fluctuations in a toroidal plasma inside the ring grow when a weak negative ambipolar potential and a steep density gradient are formed, and are reduced to a low level when a deep potential well is achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859833
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Helicon waves and efficient plasma production (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 893-898 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Helicon waves generated by radio-frequency (rf) waves are experimentally demonstrated to have the characteristics of Landau damping, as predicted theoretically, and fully ionized plasmas are realized by this efficient coupling of rf powers to plasmas. Excited waves are identified as a helicon wave by measuring wavelengths in the plasma along the magnetic field and comparing with the dispersion relation. Good agreement is found between experimental and theoretical results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859846
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    A new Zn|AlCl3|MnO2 galvanic cell suitable to water-activation (1990)
    Springer
    Journal of applied electrochemistry 20 (1990), S. 1021-1024 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The Zn|3m AlCl3 (aq)|MnO2 galvanic cell gives an open circuit voltage (OCV) of 2.0V. When the cell is discharged at constant current (1.5 mA cm−2 or 50 mAg−1), its discharge curve shows a relatively flat portion in the region 2.0–1.6 V and the cell has an energy density of 550 Wh (kg of MnO2)−1 with a discharge capacity of 330 mA (kg of MnO2)−1, these values being about 2 times and 1.5 times, respectively, larger than those of the Zn|5m ZnCl2|MnO2 cell. The cell also shows good discharge behaviour at higher electric currents (for example 9.5 mAcm−2 or 240 mAg−1), and the advantages of the Zn|AlCl3|MnO2 cell over the Zn|ZnCl2|MnO2 are clear at the higher discharge currents. The high discharge voltage, energy density, and discharge capacity of the Zn|AlCl3|MnO2 cell are attributed to the strong buffering effect of AlCl3 at pH∼3. Due to this buffering effect, the electrolytic solution causes gradual corrosion of the zinc and, consequently, the cell is suited to water-activation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01019583
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Immunohistochemical staining patterns of tenascin in invasive breast carcinomas (1992)
    Springer
    Virchows Archiv 421 (1992), S. 53-56 
    Details
    ISSN: 1432-2307
    Keywords: Tenascin ; Breast carcinoma ; Immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Eighty-two cases of primary invasive breast carcinoma and adjacent “normal” mammary glands were examined immunohistochemically for tenascin expression and distribution. Formalin-fixed tissues pretreated with actinase were processed by the avidin-biotin complex method using anti-human tenascin monoclonal antibody (RBC1). In normal mammary glands, tenascin was distributed around the ducts and ductules but not around the acini. In carcinomas, a high incidence of tenascin-positive cases (〉67%) was seen with various histological appearances, with the exception of lobular carcinoma where a low incidence was found (25%). Although intense staining was seen around cancerous foci when compared with normal mammary glands, tenascin was often expressed at cancer-mesenchymal junctions with dense fibrotic stroma, but not at junctions with active inflammatory change and a loose fibrotic stroma. Tenascin expression is not an all-or-none marker for mammary malignancy and the staining pattern suggests either a role in stimulating cancer cells or a host defence mechanism accompanied by a desmoplastic response to them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01607139
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Recrystallization-etch approach to study the plastic energy absorbtion at crack initiation and extension of pressure-vessel steel A533B-1 (1993)
    Springer
    Journal of materials science 28 (1993), S. 927-930 
    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 To evaluate the elastic-plastic fracture toughness parameter of nuclear pressure-vessel steel A533B-1, a newly developed technique (the recrystallization-etch technique) for plastic strain measurement was applied to different sizes of compact tension specimens with a crack length/specimen width of 0.6–0.5 that were tested to generate resistance curves for stable crack extensions. By means of the recrystallization-etch technique, the plastic energy dissipation or work done within an intense strain region at the crack tip during crack initiation and extension was measured experimentally. Furthermore, the thickness effects on this crack tip energy dissipation rate were examined in comparison with other fracture-parameter J integrals. Thickness effects on critical energy dissipation and energy dissipation rate during crack extension were obtained and the energy dissipation rate dW p/da in the mid-section shows a constant value irrespective of specimen geometry and size, which can be used as a fracture parameter or crack resistance property.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00400875
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  • 9
    Electronic Resource
    Electronic Resource
    Cleavage surfaces in twinned CdTe crystals (1991)
    Springer
    Journal of materials science 10 (1991), S. 975-977 
    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/BF00722151
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Numerical simulation with experimental verification of the fracture behavior in granite under confining pressures based on the tension-softening model (1993)
    Springer
    International journal of fracture 59 (1993), S. 227-244 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The use of the tension-softening model for analyzing fracture processes of rock is examined with special reference to the effect of confining pressure on the fracture extension. Tension-softening curves are measured by means of the J-based technique from unconfined tests performed on compact tension (CT) specimens of granite. On the basis of the determined tension-softening relation, numerical analyses are executed using a boundary element method (BEM) to simulate fracture of the granite under confining pressures. Numerical results are compared to the experimental results of two series of tests for which CT specimens and thick-walled cylindrical specimens were loaded to failure under confining pressures ranging from 0 to 26.5 MPa. It is shown that the BEM analyses can predict the observed fracture behavior. Based on the results, it is demonstrated that the tension-softening relation provides a suitable model to analyze the fracture process in the rock. The source mechanism for the pressure sensitive fracture is discussed by examining the growth of the fracture process zone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012363
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