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  • Articles  (38)
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  • 1
    Electronic Resource
    Electronic Resource
    Gas Phase Reaction of Methylene with Methyl Chloride (1965)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 87 (1965), S. 2062-2063 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01087a046
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  • 2
    Electronic Resource
    Electronic Resource
    Gas Phase Reaction of Diazomethane with Hydrogen Chloride, Bromide, and Iodide. An Example of Polar Transition States in the Gas Phase1 (1965)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 87 (1965), S. 3793-3801 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01095a001
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  • 3
    Electronic Resource
    Electronic Resource
    Direct spectrometry of solids in view of information characteristics (1999)
    Springer
    Fresenius' journal of analytical chemistry 363 (1999), S. 160-164 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The development of atomic spectrometric methods in recent years is characterized by a remarkable orientation towards direct analysis of solids using various sample introduction techniques in connection with inductively coupled plasma excitation. The old-fashioned direct-current arc excitation with computer-controlled arc current vs. time programming has been studied as an alternative to the above mentioned methods. The influence of different electrode material, different sample preparation mode and working atmosphere on the main figures of merit (precision of the method, dynamic concentration range, determination limit, etc.) have been studied using an evaluation procedure based on the information theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051164
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  • 4
    Electronic Resource
    Electronic Resource
    Constant-Wave Laser Oscillation in a Carbon Monoxide Chemical Laser (1970)
    [s.l.] : Nature Publishing Group
    Nature 226 (1970), S. 845-846 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The reactions believed responsible for the excitation of CO are O + CSa-CS + SO + 32 kilocalories/mole (1) O + CS?〉CO + S + 75 kilocalories/mole (2) The excitation mechanism in the CO chemical laser has been controversial2?4, but Hancock and Smith5 seem to have confirmed the likelihood of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/226845a0
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  • 5
    Electronic Resource
    Electronic Resource
    The effects of ethanol on embryonic actin: A possible role in teratogenesis (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 575-577 
    Details
    ISSN: 1420-9071
    Keywords: Ethanol ; neural crest cells ; teratogenesis ; actin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary When the neural crest is cultured in the long or short term presence of ethanol, monoclonal anti-actin reveals the development of a disorganized actin cytoskeleton. In the long term, many cells fail to differentiate morphologically, whereas in the short term already differentiated cells rapidly alter their shape and their cell-to-cell contacts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01946710
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of temperature gradients on cure and stress gradients in thick thermoset castings (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 25 (1980), S. 381-393 
    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 temperature gradient developed during casting of an unsaturated polyester for which the kinetics of reaction and the heat capacities, thermal conductivities, and densities were known from earlier work was measured experimentally as a function of time in a thick casting and compared with predicted values calculated from a mathematical model. Agreement was excellent. The castings were sectioned and the sections were examined by birefringence. These examinations show good agreement between the temperature gradient developed during cure and the residual stress gradient. This work demonstrates that the extent of cure as a function of position can be predicted from heat transfer calculations if the reaction kinetics and thermal properties are known and that the residual stress gradient is dependent upon the temperature gradient developed.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1980.070250305
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  • 7
    Electronic Resource
    Electronic Resource
    Heats of reaction and kinetics of a thermoset polyester (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 24 (1979), S. 937-946 
    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 curing reaction of a thermoset polyester was investigated by using the isothermal and dynamic techniques of differential scanning calorimetry (DSC). The heats of reaction (at different curing temperatures) and a kinetic expression of the crosslinking reaction are presented and compared to the results of the previous studies. The proposed kinetic model can be utilized to obtain the rates of heat generation and the extent of cure at different cure temperatures and time. The overall activation energy of the curing reaction was calculated on the basis of experimental data as 17.0 kcal/mole and the overall reaction rate constant as 2.60 × 109 exp (-17,000/RT) min-1.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1979.070240407
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  • 8
    Electronic Resource
    Electronic Resource
    Thermal stability and molecular weight of two new boron-nitrogen polymers (1977)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 21 (1977), S. 1561-1567 
    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: Molecular weight and thermal stability measurements on the presumed polymers of aminoborane, H2BNH2, and aminodifluoroborane, F2BNH2, were explored using a laser light scattering technique for the molecular weight measurements and both differential thermal analyses and thermogravimetric analyses for the thermal stability studies. Weight-average molecular weight of polymeric aminodifluoroborane in water was determined as 23,000 g/mole, whereas the molecular weight of polymeric aminoborane could not be determined since a suitable solvent was not found. Both DTA and TGA observations showed partial decomposition of polymeric aminoborane between 135° and 200°C, and the vaporization of polymeric aminodifluoroborane between 250° and 360°C.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1977.070210611
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  • 9
    Electronic Resource
    Electronic Resource
    Variation of thermal conductivity and specific heat during cure of thermoset polyesters (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 24 (1979), S. 947-952 
    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: Variation of thermal conductivity and specific heat of a general-purpose unsaturated polyester during cure was investigated experimentally. Measurements were made on the cured, partially cured, and uncured samples, and the results are presented. Both thermal conductivity and specific heat of the cured samples increase nearly linearly with increasing temperature. Effect of degree of cure on the thermal properties is evident during the earlier stages of cure.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1979.070240408
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  • 10
    Electronic Resource
    Electronic Resource
    Comparison of various calibration techniques for the direct spectroscopical analysis of SiC powders (1996)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 355 (1996), S. 601-605 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Techniques for the direct analysis of powdered advanced ceramics provide an advantageous alternative to methods using wet digestion in sample preparation. The direct spectrochemical methods based on electrothermal vaporization (ETV-ICP-OES, solid-ETV-AAS, etc.) show a great similarity to the classical method of d. c. arc excitation. The calibration procedure is the major difficulty of all techniques applied for direct solid sample analysis, as there is a lack of suitable reference materials of ceramics. Consequently, it was necessary to verify various possibilities of preparation and application of model calibration samples. The results of such a calibration are compared with those using within-laboratory standards.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0021663550601
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