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  • 1990-1994  (3)
  • 1993  (2)
  • 1991  (1)
Material
Years
  • 1990-1994  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4206-4210 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The average electron densities in CH4/H2/Ar and CCl2F2/O2 electron cyclotron resonance discharges typical of those used for etching InP, GaAs, and related materials have been measured approximately 4 cm downstream from the multipolar microwave source as a function of microwave power (50–300 W), additional radio-frequency power (10–50 W), pressure (1–20 mTorr), flow rate (30–90 standard cubic centimeters per minute) and gas composition. At 1 mTorr pressure and 10 W rf, the electron densities (and semiconductor etch rates) increase rapidly with microwave power, from 1.3×1011 cm−3 for 5CH4/17H2/8Ar and 6×1010 cm−3 for 28CCl2F2/2O2 discharges at 50-W microwave power, to 9×1011 cm−3 and 3×1011 cm−3, respectively at 300-W microwave power. At the highest microwave power levels (≥200 W) the InP and GaAs etched surface morphologies are rough due to preferential removal of one of the lattice constituents from each material. The electron densities in both types of discharge show moderate increases with increasing rf power level, pressure or higher Ar or O concentrations.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 43 (1993), S. 0 
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Superoxide dismutase (SOD) activity in the skin of fish was observed to be higher in the dark than in the light parts. SOD activities in both parts were confirmed by visualisation of SOD activity on polyacrylamide gels. We suggest that the distribution of higher SOD in the dark parts of the skin might be related to melanization and to regulate of reactive oxygen species.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Wood science and technology 28 (1993), S. 23-33 
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary In terms of the problem of formaldehyde-releasing, glyoxal is one of the interesting dialdehydes as a crosslinking agent for wood. In the present report, the reaction of glyoxal and glyoxal/glycol with the wood of Japanese ash (Fraxinus mandshurica Rupr. var. japonica Maxim.) has been studied. Particular attention to the structure of the product (after treatment with glyoxal/glycol (glycol: ethylene glycol, diethylene glycol, triethylene glycol)) was made and the formation of crosslinking has been discussed. Reaction of only glyoxal with wood showed little reactivity, while that of glyoxal/glycol gave high weight increases for each glycol. The appropriate condition was at 100° to 130°C for 2 hrs. It was found that the product forms network structures, at least within itself. The crosslinking between the product and wood components, however, could not be confirmed, although it was assumed that the product was structurally linked to wood by its reactive sites.
    Type of Medium: Electronic Resource
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