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  • 1
    Electronic Resource
    Electronic Resource
    Uranium(IV) hydrolysis constants and solubility product of UO2.cntdot.xH2O(am) (1990)
    s.l. : American Chemical Society
    Inorganic chemistry 29 (1990), S. 260-264 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00327a022
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  • 2
    Electronic Resource
    Electronic Resource
    Emissions of Organic Hazardous Air Pollutants from the Combustion of Pulverized Coal in a Small-Scale Combustor (1994)
    s.l. : American Chemical Society
    Environmental science & technology 28 (1994), S. 1150-1158 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es00055a022
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  • 3
    Electronic Resource
    Electronic Resource
    Modulated reflectance and resonant Raman scattering of GaAs quantum wires grown on nonplanar substrates (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 3587-3589 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Modulated reflectance spectroscopy and resonant Raman scattering have been used to study the quantized states of crescent-shaped GaAs quantum wires. Distinct one-dimensional excitonic transitions originating from the quantum wires together with the expected resonances from the bent quantum wells are observed. The quantum wire transition energies compare very well with those calculated using a V-shaped potential derived from transmission electron microscopy measurements of the lateral variation of the GaAs well width. The spectroscopic techniques employed here provide alternative methods of probing the confined states in quantum wires of low luminescence efficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111206
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  • 4
    Electronic Resource
    Electronic Resource
    The effects of temperature and oxygen concentration on the photoluminescence of epitaxial metalorganic vapor-phase epitaxy GaAs:O (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1175-1179 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Semi-insulating epitaxial GaAs:O prepared in a metalorganic vapor-phase epitaxy growth process using DEALO [(C2H5)2AlOC2H5] as the oxygen source has been characterized by temperature-dependent (12–300 K) photoluminescence. Oxygen-related deep level photoluminescence bands were detected at ∼0.8 and ∼1.1 eV. The relative intensities of the two bands were sensitive to both oxygen concentration and temperature. At a given temperature, an increase in oxygen concentration led to an increase in the intensity of the lower energy band relative to the higher energy band. A similar effect occurred at a given oxygen concentration as the temperature was raised. Band edge luminescence was also measured and was observed to quench when the oxygen concentration exceeded ∼1018 cm−3. The results indicate that oxygen is incorporated differently in epitaxial GaAs than in bulk GaAs. We propose that the difference is due to the incorporation of Al when DEALO is used in the growth of epitaxial GaAs:O. We suggest equally plausible microscopic models, based on the number of nearest-neighbor Al associated with O and multiple charge states, to explain the properties of the oxygen-related photoluminescence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357842
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  • 5
    Electronic Resource
    Electronic Resource
    Pressure-induced phase transition in porous silicon (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2260-2262 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High pressure studies of porous silicon reveal that a phase transition occurs at ∼170 kbar. The phase transition is detected by an abrupt change in color of porous silicon from orange-yellow to black. Photoluminescence measurements show an initial blue shift of the luminescence peak. At ∼25 kbar the blue shift ceases and a reversal of shift is observed. The red shift continues up to ∼90 kbar at which point the luminescence is quenched. The shift reversal is interpreted as a pressure-induced direct–indirect transition in porous silicon. The results are best explained in the context of the quantum confinement model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110546
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  • 6
    Electronic Resource
    Electronic Resource
    Past as prologue (1993)
    [s.l.] : Nature Publishing Group
    Nature 362 (1993), S. 676-676 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE first citation in the Oxford English Dictionary for the word 'pharmacology' is dated to 1721. It was more than 150 years, however, before anything approaching modern conceptions of the discipline arose out of the conjunction and transmutation of materia medica, physiology and chemistry. This ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/362676a0
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  • 7
    Electronic Resource
    Electronic Resource
    The Hermetic Hamlet (1994)
    [s.l.] : Nature Publishing Group
    Nature 370 (1994), S. 517-518 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] CLASSICAL knowledge was preserved in the expanding Arab world during the dark ages in western Europe following the resorption of the Roman empire. Much of this knowledge was rediscovered and reacquired by the West in the centuries thereafter. This passage is memorialized linguistically by the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/370517a0
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  • 8
    Electronic Resource
    Electronic Resource
    Ne'er the twain shall meet (1994)
    [s.l.] : Nature Publishing Group
    Nature 368 (1994), S. 370-371 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Billion Dollar Molecule: One Com-pany's Quest for the Perfect Drug . By Barry Werth Simon and Schuster: 1994. Pp. 445. $25. Music lessons in my high school usually consisted of chanting "R-H-Y-T-H-M spells rhythm" or "Every Good Boy De-serves Fruit". On the rare occasions we had actual music, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/368370a0
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  • 9
    Electronic Resource
    Electronic Resource
    The mushrooming brain (1992)
    [s.l.] : Nature Publishing Group
    Nature 356 (1992), S. 635-636 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Food of the Gods: The Search for the Original Tree of Knowledge. By Terence McKenna. Bantam: 1992. Pp. 300. $21.50. IN the beginning were the great savannahs of Africa, on which presapient hominids, with brains one-third the size of ours, eked out marginal existences as gatherers and inefficient ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/356635a0
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  • 10
    Electronic Resource
    Electronic Resource
    Botanical lore (1993)
    [s.l.] : Nature Publishing Group
    Nature 362 (1993), S. 27-28 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] These alliterative titles seem designed more to catch the eye than to inform. One of the main questions addressed by Bellamy and Pfister is how the empirical folk knowledge of the properties of plants slowly transformed itself into mainstream Western medicine. We are taken on a historical tour of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/362027a0
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