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  • 1
    Electronic Resource
    Electronic Resource
    Rigid-rod thermosets based on 1,3,5-triazine-linked aromatic ester segments (1992)
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 2947-2954 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00037a025
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  • 2
    Electronic Resource
    Electronic Resource
    Chiral organosilicon compounds in asymmetric synthesis (1992)
    s.l. : American Chemical Society
    Chemical reviews 92 (1992), S. 995-1006 
    Details
    ISSN: 1520-6890
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cr00013a012
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  • 3
    Electronic Resource
    Electronic Resource
    Observations on the larval development of Mystus macvopterus (Bleeker): Bagridae (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 40 (1992), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: From June to July 1988, larvae of Mystus macropterus (Bleeker) were obtained by artificial propagation of spawners collected from the Jialing River, China. Larvae grown in water temperatures ranging from 26 to 29°C were fully developed at approximately 20 days. The newly-hatched larvae measured 6.0–7.5 mm t.l., exceeding the dimensions of any known newly-hatched larvae of freshwater catfishes indigenous to China. Five days after hatching, when the larvae were 11.4 mm t.l. and the prolarval stage was complete, exogenous feeding commenced. Twelve days after hatching, at 18.4 mm t.l., the yolk sac disappeared, organogenesis was almost complete and the juvenile period began. At 20 days post-hatching, at 23.0 mm t.l., the lateral line system had formed and the juveniles resembled the adults with respect to all external features, which signalled the end of thejuvenile period. Comparison of the larval development in eight species ofeconomic freshwater catfishes shows that the most significant aspect of the larval development of M. macropterus is the sustained (6–7 days) mixed nourishment period and the early differentiation of organs, which enhances the survival rate of the larvae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1992.tb02584.x
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  • 4
    Electronic Resource
    Electronic Resource
    Electron paramagnetic resonance study of Cu(II) in the Cu(II) doped (NH4)2[Zn(NH3)2(CrO4)2] and (NH4)2[Cd(NH3)2(CrO4)2]: Orientational disorder of NH3 and dynamically induced structural change (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 3897-3904 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron paramagnetic resonance (EPR) spectra recorded at X band on Cu(II) in the Cu(II) doped single crystals of (NH4)2[Zn(NH3)2(CrO4)2] and (NH4)2[Cd(NH3)2(CrO4)2] showed an unusual temperature dependence in the temperature range between 4.2 and 370 K. This unusual temperature dependence is attributed to the dynamics of NH3 molecules. It is concluded that NH3 undergoes an order–disorder transition. This transition occurs at 282±2 K (T*) for (NH4)2[Zn(NH3)2(CrO4)2] and at 300±5 K for (NH4)2[Cd(NH3)2(CrO4)2]. For temperatures above T* the EPR spectra are found independent of temperature. This observation indicates that the NH3 molecules behave as free rotors rotating about their threefold symmetry axis. As the temperature is lowered, the free rotation gradually becomes hindered which leads at T* to site doubling in the EPR spectra. The hindered rotation simultaneously induces a structural change at T* reducing the local symmetry at the Cu(II) site from C2/m to approximately Cs. In the temperature range between T* and about 80 K, the EPR spectra with the magnetic field perpendicular to the threefold axis of NH3 are temperature dependent, but those with the magnetic field parallel to the threefold axis remain unchanged. This behavior is qualitatively interpreted as being due to the torsional oscillation of NH3. At temperatures lower than 80 K, the NH3 molecules exhibit the torsional oscillation of the lowest state and accordingly, all the EPR spectra become temperature independent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462928
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  • 5
    Electronic Resource
    Electronic Resource
    The first x-ray diffraction station at Beijing Synchrotron Radiation Laboratory, BEPC : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1078-1079 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The first x-ray diffraction experimental station at Beijing Synchrotron Radiation Laboratory has been available for synchrotron radiation users in research. The station is located on the back-end of 4B9A, a beamline from a bending magnet. When the storage ring of BEPC operates in a dedicated mode (2.2 GeV), 4B9A provides a focused monochromatic x ray in between 4 and 12 keV. A four-circle diffractometer with a crystal analyzer is installed. Experimental processes such as apparatus alignment, monitoring of incident radiation, acquisition of diffracted intensities, and running of the monochromator, are controlled with a computer through CAMAC modules. In this article, instrumentation and performances of the station are outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143205
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  • 6
    Electronic Resource
    Electronic Resource
    Surface analytical study of the interaction between γ-amino propyl triethoxysilane and E-glass surface (1992)
    Springer
    Journal of materials science 27 (1992), S. 36-48 
    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 Time-of-flight secondary ion mass spectrometry has been used to study the interaction of γ-amino propyl triethoxysilane with an E-glass surface. The fragmentation pattern has been interpreted by assigning a series of mass peaks to the structural unit of the poly(aminosiloxane). The composition of the coating is complicated by the presence of polydimethylsiloxane and its copolymers. The highest mass fragment was obtained from the coating exposed by extraction with warm water (697 AMU). The largest molecular fragments would appear to have degrees of polymerization of 6 with differing numbers of silanol groups. On re-extraction with hot water the fragment size decreased. It is postulated that the network chain length of the three-dimensional polymer decreased as the interface was approached. At the glass surface a chemically bound molecular layer could be identified. The full chemical nature of the deposit is complicated by the incorporation of aluminium from the substrate into the coating. It was also possible to confirm that a layer of warm-water soluble oligomers existed at the air interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553834
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  • 7
    Electronic Resource
    Electronic Resource
    Surface analytical study of the interaction between γ-amino propyl triethoxysilane and E-glass surface (1992)
    Springer
    Journal of materials science 27 (1992), S. 36-48 
    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 Time-of-flight secondary ion mass spectrometry has been used to study the interaction of γ-amino propyl triethoxysilane with an E-glass surface. The fragmentation pattern has been interpreted by assigning a series of mass peaks to the structural unit of the poly(aminosiloxane). The composition of the coating is complicated by the presence of polydimethylsiloxane and its copolymers. The highest mass fragment was obtained from the coating exposed by extraction with warm water (697 AMU). The largest molecular fragments would appear to have degrees of polymerization of 6 with differing numbers of silanol groups. On re-extraction with hot water the fragment size decreased. It is postulated that the network chain length of the three-dimensional polymer decreased as the interface was approached. At the glass surface a chemically bound molecular layer could be identified. The full chemical nature of the deposit is complicated by the incorporation of aluminium from the substrate into the coating. It was also possible to confirm that a layer of warm-water soluble oligomers existed at the air interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02403641
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  • 8
    Electronic Resource
    Electronic Resource
    Estimating cell concentration in the presence of suspended solids: A light scatter technique (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 40 (1992), S. 875-888 
    Details
    ISSN: 0006-3592
    Keywords: cell concentration ; light scatter ; solid substrate ; fermentation ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A novel sensor was developed, based on light scatter, to estimate the cell concentration in the presence of suspended solids. The light scatter properties of cells in the presence of suspended solids were investigated. Two crucial observations were made: first, that the light scatter from cells is essentially a linear function of cell concentration and, second, that invariant regions are present in the light scatter spectrum of cell/solid substrate mixtures. Invariant regions are wavelength intervals of the light scatter spectrum in which the light scatter reading is independent of solid substrate concentration and only a function of cell concentration. The occurrence of invariant regions is the key behavior which allowed the quantification of cell concentration in the presence of suspended solids.An algorithm was developed for the estimation, from light scatter data, of cell concentration in the presence of solid substrate. The light scatter approach was validated by comparing cell concentrations estimated by this technique to those obtained from DNA and carbon dioxide evolution rate measurements during a series of fermentations. The model system used was Bacillus subtilis var sakainensis ATCC 21394 growing on fishmeal as the sole nitrogen source.A model was developed based on the interactions of scatter and absorbance. This model reflects the hypothesis that invariant regions are caused by changes in the absorbance of the solid substrate as a function of wavelength. © 1992 John Wiley & Sons, Inc.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260400803
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of ageing treatment on fatigue strength in a SiCw/6061Al composite (1992)
    Springer
    Journal of materials science 11 (1992), S. 970-972 
    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/BF00729896
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  • 10
    Electronic Resource
    Electronic Resource
    Triazine networks modified with monofunctional reactive cyanate ester monomers (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 44 (1992), S. 1267-1274 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The preparation of cyanate ester thermosetting resins by coreacting a fluorinated bisphenol A dicyanate (6F-BADCY) monomer with a monofunctional reactive cyanate, namely, the dinonyl phenol cyanate (DNPC), is described in this paper. Our objective in this study was to modify the 6F-BADCY system with reactive diluents of a nonpolar nature and produce matrix resins processable at FR-4 epoxylike conditions. By introducing the monofunctional cyanate as a reactive diluent, it is expected that the molar crosslink density of the resulting network will be reduced. Highly branched triazine polymers will result from this approach. Dinonyl phenol cyanate was quantitatively synthesized by reacting dinonyl phenol with cyanogen bromide in the presence of triethylamine.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070440716
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