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  • 1
    Electronic Resource
    Electronic Resource
    Heat treatment of pure silica glass studied by positron annihilation (1978)
    Springer
    Applied physics 16 (1978), S. 119-120 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 61.10 ; 81
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The crystallinity of silica glass fused from Brazilian quartz was studied by Doppler-broadening techniques after heat treatment in the temperature range between 1000°C and 1500°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00931432
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  • 2
    Electronic Resource
    Electronic Resource
    Luminescence autoradiographic investigations on silica glass activated by ionizing radiation
    Amsterdam : Elsevier
    Journal of Luminescence 40-41 (1988), S. 833-835 
    Details
    ISSN: 0022-2313
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-2313(88)90459-0
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of immunoreactive components of insulin and somatostatin in canine pancreatic juice
    Amsterdam : Elsevier
    FEBS Letters 105 (1979), S. 23-26 
    Details
    ISSN: 0014-5793
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(79)80879-0
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  • 4
    Electronic Resource
    Electronic Resource
    Characterization of precursor-ceramic conversion in Si-C-(O,N)-systems by thermoanalytical methods (1998)
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 592-593 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract On-line coupling of thermogravimetry (TG) with evolved gas analysis (EGA)/mass spectrometry (MS) was applied to characterize the organic-inorganic conversion of two synthesized polysilazanes to Si-C-N materials and of one commercial polysiloxane to Si-C-O materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050959
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  • 5
    Electronic Resource
    Electronic Resource
    15N CP/MAS NMR as an instrument in structure investigations of organosilicon polymers (1999)
    Springer
    Fresenius' journal of analytical chemistry 363 (1999), S. 185-188 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract 15N solid state NMR without enrichment is rarely used because of the low sensitivity and low natural abundance of this nucleus. As demonstrated on different nitrogen-containing polysilanes and polysilazanes, it can be shown that with the CP/MAS technique spectra can be obtained in good quality and within acceptable measuring time. Three main different nitrogen sites – NSi3, NSi2H and NSiH2– can be observed as well as changes in the intensities of these sites with reaction and tempering conditions. Thus the spectra give valuable additional information for a better understanding of the structures and their changes within the investigated systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051168
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  • 6
    Electronic Resource
    Electronic Resource
    Crystallinity of pure silica glass studied by positron annihilation (1978)
    Springer
    Applied physics 16 (1978), S. 231-233 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 61.10 ; 81
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The crystallinity of silica glass fused from Brasilian quartz is demonstrated by positron annihilation lineshape measurements using a high resolution Ge(Li)-detector as well as by positron lifetime measurement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885117
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal analysis of the direct nitridation of silicon to Si3N4 (1988)
    Springer
    Journal of thermal analysis and calorimetry 33 (1988), S. 479-485 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die direkte Nitridierung von verschiedenen Siliciumpulvern wurde thermogravimetrisch verfolgt. Die chemische Zusammensetzung des unter optimalen Nitridierungsbedingungen hergestellten Endprodukts lag zwischen Si3N3,41 und Si3N3,93 in Abhängigkeit vom Ausgangsmaterial. Die Gründe für die teilweise unvollständige Nitridierung werden diskutiert. Die Kinetik der Nitridierung wurde analysiert, ihre Aktivierungsenergien wuvden bestimmt. Der Mechanismus sowohl der Vorwie auch der Hauptreaktion entspricht einer Phasengrenzreaktion mit unterschiedlichen Reaktionsordnungen.
    Abstract: Резюме Методом ТГ изучено пр ямое азотирование различных порошков к ремния. Химический состав ко нечного продукта азо тирования в зависимости от исход ного материала изменяется между Si3N3,41 и Si3N3,93. Обсуждены причины различного стехиоме трического состава образующихс я продуктов. Исследов ана кинетика реакций азотировани я и определены их энергии активации. Механизм как предвар ительной, так и основной реакци и, в общем, соответствует реакц ии на границе раздела фаз с различным порядком р еакций.
    Notes: Abstract The direct nitridation of different silicon powders was investigated by thermogravimetry. The chemical composition of the final product, produced unter the optimum nitridation conditions, varied in the region between Si3N3.41 and Si3N3.93, depending on the basic material. The reasons for the incomplete nitridation ratio are discussed. The nitridation was kinetically analyzed, and the activation energies of the nitridation reaction were determined. The mechanisms of the prereaction and the main reaction generally correspond to phase boundary reactions with different reaction orders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913926
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  • 8
    Electronic Resource
    Electronic Resource
    The influence of particle size on the tensile strength of particulate — filled polymers (1977)
    Springer
    Journal of materials science 12 (1977), S. 1605-1613 
    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 The tensile strengths of a particulate-filled rigid polyurethane resin are presented at varying volume fractions and a wide range of particle sizes. These results are compared with exisiting theories of the strength of particulate-filled composite systems. A linear relationship is proposed to exist between the mean particle diameter and the tensile strength at a given volume fraction. A method of normalizing data is presented which removes the stress-concentration effects of finite particle sizes and allows comparison of the data with a simple equation relating tensile strength and volume fraction. The effects of particle size and volume fraction in relation to crack propagation are discussed, and the proposed method of analysis is shown to give similar results when applied to published data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00542811
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  • 9
    Electronic Resource
    Electronic Resource
    Heptane-soluble material from atactic polypropylene. II. Interaction with liquidsProd. No. 1369 (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 10 (1966), S. 1121-1132 
    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: Reduced melting point and swelling measurements, involving heptane-soluble material from atactic polypropylene and over thirty liquids of differing chemical type, are reported. A value of 578 ± 40 cal. is obtained for the molar heat of fusion of a crystalline repeat unit which is much lower than values given for isotactic polypropylene. Some reasons for the low value are considered. Values of the polymer-solvent interaction parameter χ1 for systems involving alkylbenzenes and n-alkanes suggest a solubility parameter of 7.9 ± 0.1 (cal./cc)1/2 for the polymer. These values of χ1 decrease with increasing molar volume of liquid. Polar liquids of comparable solubility parameter or molar volume are associated with higher values of χ1. Intrinsic viscosities and values of the slope constant k′ are given for fractions in the molecular weight range 3,000-25,000 and six solvents at 25°C. The results suggest the following order of solvent power: cyclohexane ≈ cyclohexene 〉 methylcyclohexane 〉 trichloroethylene 〉 decalin 〉 carbon tetrachloride. Intrinsic viscosities are higher than those generally obtained for flexible polymers of comparable molecular weight, and the values of the Mark-Houwink exponent appear to be high. Some reasons for these high values are considered.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1966.070100804
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  • 10
    Electronic Resource
    Electronic Resource
    Heptane-soluble material from atactic polypropylene. I. Fractionation and characterization of fractions (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 2019-2029 
    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: A sample of commercial atactic polypropylene was extracted with ether and the residue extracted with boiling n-heptane. Six fractions of the heptane-soluble material, which is very similar to that obtained by heptane extraction of isotactic polypropylene, were obtained by stepwise addition of acetone to a solution in cyclohexane. Densities, melting points, and x-ray photographs of the fractions and the unfractionated material were obtained and infrared absorption spectra used to estimate tacticity. Molecular weights, determined by means of a vapor pressure osmometer, ranged from about 3000 to about 25,000. That of the fraction of highest molecular weight was in good agreement with a separate determination by means of osmotic pressure measurements. Separation in fractionation occurred in order of decreasing molecular weight and increasing crystallinity as estimated from densities and x-ray photographs. Tacticity also seems to increase with decreasing molecular weight. Melting points of the fractions were not entirely in the order expected from their molecular weights and estimated crystallinities, and it is possible that low DP isotactic material may be preferentially concentrated in the highest molecular weight fraction. It is emphasized that the unfractionated material may contain polymers possessing a range of order intermediate between those of purely atactic and purely isotactic polymer and that refractionation may be required in order to characterize the material completely.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070090603
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