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  • Electronic Resource  (7)
  • 1990-1994  (6)
  • 1940-1944  (1)
  • 1992  (6)
  • 1942  (1)
Material
  • Electronic Resource  (7)
Years
  • 1990-1994  (6)
  • 1940-1944  (1)
Year
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 57 (1992), S. 3240-3242 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 1912-1914 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Impedance monitoring of a rf glow discharge is successfully used to determine the end point of reactive ion etching. The feasibility of using this technique is demonstrated on diode, triode, and magnetic multipole enhanced triode reactors applied to etching polycrystalline silicon on SiO2 on Si and Si3N4 on Si in an SF6 plasma, and to stripping photoresist on Al on Si in an O2 plasma. The end point of etching is determined by monitoring changes in the induced dc bias, the rf voltage, the rf current, or the phase relationship between them on either of the powered electrodes (in the cases of the triode configurations). This method is easily applicable as in in-process end-point detector and eliminates the need of optical access to either the plasma or the substrate.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 2335-2337 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The addition of a simple inexpensive magnetic multipole to a parallel plate triode results in a magnetic enhanced etch reactor configuration that has impressive low pressure characteristics. The multipole electrode which is in the form of a cylindrical multipolar bucket, open at both ends, is added to the powered electrode of the triode being employed as a plasma etching system. The multipole becomes, in effect, an extension of the ground shield, surrounding either electrode. The resulting electrode configuration produces an extremely uniform, dense plasma at pressures as low as 2–3×10−4 Torr. The effect of the magnetic enhancement (electron containment, uniformity profile modification, and low substrate bias) is particularly pronounced at lower pressures. Significant improvement over existing triode schemes is obtained using the grounded cylindrical multipolar bucket as an extension of the ground shield of the driven electrode (not the substrate electrode). This system is considerably simpler than dual frequency driven trielectrode systems since it uses 13.56 MHz excitation of both electrodes.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 149 (1942), S. 168-168 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE chemotherapeutic value of the antibacterial substances produced by micro-organisms has attracted much attention in recent years. Very little is known concerning the effect of these antibacterial substances on Protozoa. For the past few years I have carried out work1,2,3 on ...
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-0867
    Keywords: Liming ; B nutrition ; pea ; corn ; hot-water soluble B ; soil pH ; acid Alfisol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A field experiment was conducted during 1986–87 on a sandy loam acid Alfisol of Barapani, Meghalaya, India to study the effect of liming on boron nutrition of pea and corn grown in a sequence. Lime and boron were applied to pea and their residual effect was studied on corn. Application of 1.5 kg B ha−1 significantly increased the pod and stover yield of pea. A sharp yield depression occurred at higher B rates. Liming accentuated B deficiency in the absence of B treatment and it cured toxicity arising from excess B supply. A combination of B at 1.5 kg ha−1 and lime at 3.0 t ha−1 was optimum for pea, but this level of B application was insufficient to meet B requirements of succeeding corn. With higher rates of B fertilization, the residual effect of B on corn yield was significant. Concentration of B in shoot, pod, grain and stover of crops increased with the rate of B application. With increasing liming rate, B concentration decreased. Addition of B increased the hot-water soluble B in soil. The availability of native and added B decreased sharply with increasing liming rate.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 356 (1992), S. 293-293 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - The radioactivity of substances in daily use has been well documented. But it is not common knowledge even to nuclear and health physicists that the fine papers used in high-quality printing, photocopying and writing are indeed radioactive. Using standard y-ray spectroscopic methods with a ...
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 341 (1992), S. 249-253 
    ISSN: 1434-601X
    Keywords: 21.10.-k ; 23.20.-g ; 23.20.Lv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper presents a study of theγ rays from the electron capture decay of 3.63d 100Pd. Singles and coincidence measurements provided an accurate determination ofγ-ray intensities and an improved knowledge of the100Rh level scheme. Experimental evidence supports excitation of levels in100Rh at 86-, 136- and 154 keV, not previously reported from the decay of100Pd.
    Type of Medium: Electronic Resource
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