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  • 1
    Electronic Resource
    Electronic Resource
    Automatic wide-range scanning and calibration over 220–740 nm using a dye laser with a rapid cell exchanger (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2927-2931 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A pulsed dye laser system fully controlled by a microcomputer has been developed as a tunable light source for analytical spectroscopy. The system has 13 dyes with a rapid replacement mechanism and a frequency doubler inside, and any desired wavelength from 220 to 740 nm can be instantaneously generated by the aid of the microcomputer control. The absolute wavelength can be automatically calibrated with a newly developed optogalvanic wavemeter with an accuracy of ±1 cm−1 over the whole spectral range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142588
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  • 2
    Electronic Resource
    Electronic Resource
    Sensitive detection of trace elements in pure water by laser-induced atomic fluorescence spectroscopy in microwave discharge atomization (1993)
    s.l. : American Chemical Society
    Analytical chemistry 65 (1993), S. 2096-2101 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00063a028
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  • 3
    Electronic Resource
    Electronic Resource
    Anomalous characteristics of the microcrystalline state of SiC fibres (1979)
    [s.l.] : Nature Publishing Group
    Nature 279 (1979), S. 706-707 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1 shows a chemical analysis of the SiC fibre obtained after heat-treatment (1,300 C) of the precursor fibre. Its atomic ratio is Si : C : O : H = l : 1.46:0.36:0.03. Table 1 shows that the SiC fibre contains appreciable amounts of carbon and of oxygen which had been introduced by the heating ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/279706a0
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  • 4
    Electronic Resource
    Electronic Resource
    Mechanical and Thermal Properties of Micro-Closed Cellular Materials Containing Different Materials from that of Cell Walls (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 1693-1698 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A method to fabricate the metallic closed cellular material has been developed. Powderparticles of polymer or ceramics coated with a metal layer using electro-less plating were pressedinto pellets and sintered at high temperatures by heating and spark plasma sintering (SPS) method.A metallic closed cellular material containing different materials from that of cell walls was thenfabricated.The mechanical and Thermal properties of this material were measured. The results of thecompressive tests show that this material has the different stress-strain curves among the specimensthat have different thickness of the cell walls and the sintering temperatures of the specimens affectthe compressive strength of each specimen. Also, it seems that the results of the compressive testsshow that this material has high-energy absorption and Young’s modulus of this material dependson the thickness of the cell walls. Also thermal properties of this material were measured
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1693.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Si-C fiber prepared from polycarbosilane cured without oxygen (1992)
    Springer
    Journal of inorganic and organometallic polymers and materials 2 (1992), S. 161-169 
    Details
    ISSN: 1572-8870
    Keywords: Si-C fiber ; polycarbosilane ; curing method ; thermal stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new curing method for polycarbosilane was developed. In this method, halogenated hydrocarbon or unsaturated hydrocarbon vapor was used as curing agent. Si-C fiber with a small amount of oxygen was prepared from polycarbosilane fiber cured without introducing oxygen. The structure and the properties of the fiber are discussed in comparison with Si-C-O fiber obtained from thermal-oxidized polycarbosilane fiber. Using the new curing method, the thermal stability of the Si-C fiber was far improved with respect to that of conventional Si-C-O fiber.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696543
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  • 6
    Electronic Resource
    Electronic Resource
    Photocatalytic Reduction of Nitrate in Water on Meso-Porous Hollandite Catalyst: A New Pathway on Removal of Nitrate in Water (2000)
    Springer
    Journal of sol gel science and technology 19 (2000), S. 505-510 
    Details
    ISSN: 1573-4846
    Keywords: hollandite ; meso-porous material ; photocatalyst ; N2 formation ; reductive decomposition of nitrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Photocatalysis of a hollandite compound K x Ga x Sn8−x O16 (x = ca. 1.8) was examined for the reduction of nitrate to N2 with a reducing agent of methanol in water under UV irradiation. Hollandites have a characteristic one-dimensional tunnel structure. The meso-porous hollandite was prepared by sol-gel method. This hollandite was used as the photocatalyst and its reaction process was quantitatively analyzed by using ion chromatograph and on-line mass spectrometry. The hollandite photocatalyst showed a significant activity for the formation of N2 from NO 3 − . Two factors, an increase in UV intensity and a lowering in pH of the solution, contributed to improvement in the selectivity for N2. The selectivity for N2 was improved to reach the perfect level by adjusting the factors. Although, in the previous report, the nitrate was mainly reduced to NH 4 + or NO 2 − , the present photocatalytic conditions converted it to N2. The observed photocatalytic reduction of NO 3 − to N2 with reducing agent CH3OH was conjugated to the partial oxidation of CH3OH to HCOOH. This high selective photocatalytic decomposition of NO 3 − to N2 may be a new pathway among the others reported so far, and it would be useful for environmental protection of water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008724219384
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis of a polytitanocarbosilane and its conversion into inorganic compounds (1981)
    Springer
    Journal of materials science 16 (1981), S. 1349-1355 
    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 novel polytitanocarbosilane, formed by the cross-linking of polycarbosilane with titanium tetra-alkoxide, was synthesized to examine the process of converting a multielement organometallic polymer into an inorganic compound. The chemical structure of this polymer was investigated by the techniques of infra-red spectroscopy (IR), gel permeation chromatography (GPC), number average molecular weight measurements and29Si nuclear magnetic resonance (NMR) measurements. The pyrolysis products in N2 gas at 1400° C and 1700° C were the microcrystalline and crystalline states of silicon carbide and titanium carbide, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01033851
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  • 8
    Electronic Resource
    Electronic Resource
    Ceramic fibres from polymer precursor containing Si-O-Ti bonds (1991)
    Springer
    Journal of materials science 26 (1991), S. 3657-3664 
    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 Polycarbosilanes containing titanium alkoxide as pendant groups (atom ratio Ti/Si = 0.07 and 0.15) were synthesized. These polymers were melt-spun and then heat-treated in a vacuum, in oxygen or ammonia gas flow, resulting in Si-Ti-C-O, Si-Ti-0 and Si-Ti-O-N fibres, respectively. The pyrolysis process of the polymer is discussed in connection with the mechanical properties and the structure of the fibre. At high heat-treatment temperatures, β-SiC and TiC (in Si-Ti-C-O fibre), anatase (in Si-Ti-O fibre) and TiN (in Si-Ti-O-N fibre) crystallized, which may be closely related to the decomposition of the Si-O-Ti bond in the fibre.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00557159
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of continuous silicon carbide fibre (1983)
    Springer
    Journal of materials science 18 (1983), S. 3633-3648 
    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 Polycarbosilanes which are the precursors of SiC fibre were synthesized by three methods. The molecular structure of each polycarbosilane was represented by means of three structural elements determined by IR, UV and NMR spectral measurements. The pyrolysis process of the polycarbosilanes is discussed for the six stages observed in the TG-DTA curves and gas evolution curves during pyrolysis of the polycarbosilanes. In each stage, the relationship between the molecular structure and the structure of the pyrolysis product is discussed and the pyrolysis process of the polycarbosilanes is characterized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540736
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis of continuous silicon carbide fibre (1986)
    Springer
    Journal of materials science 21 (1986), S. 321-328 
    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 structure of polycarbosilane is represented by three structural elements, but their quantification is difficult. Polycarbosilanes were synthesized by three methods and the respective molecular structures were examined by measurements of the molecular weight and the intrinsic viscosity, infrared, ultraviolet,1H-,13C- and29Si-NMR spectral measurements, and chemical analysis. The three structural elements (SiC4, SiC3H, SiC x Si4−x ) in the polycarbosilane molecule were determined quantitatively. By the comparison between1H-NMR spectral data and calculation assuming a linear chain structure, the number of linkages in the unit consisting of ten silicon atoms was estimated to be 3 to 4. This result is in agreement with the result from the intrinsic viscosity; it was found that the shape of the polycarbosilane molecule is planar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01144739
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