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  • 1995-1999
  • 1990-1994  (2)
  • 1994  (2)
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Material
Years
  • 1995-1999
  • 1990-1994  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Development of Si-B-O-N fibres from polyborosilazane (1994)
    Springer
    Journal of materials science 29 (1994), S. 2238-2244 
    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 A polyborosilazane, which is a precursor of ceramic fibre, was synthesized from perhydropolysilazane and trimethyl borate. The polyborosilazane was dry-spun and then pyrolysed to produce amorphous Si-B-O-N fibre. The Si-B-O-N fibre retained its high tensile strength to higher temperatures (about 1600 °C). The fibre has a density of 2.4 g cm−3, tensile strength of 2.5 GPa and an elastic modulus of 180 GPa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01154704
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Simultaneous determination of rhenium, osmium and iridium in meteoritic samples by neutron activation analysis using simple and effective radiochemical procedures (1994)
    Springer
    Journal of radioanalytical and nuclear chemistry 185 (1994), S. 3-13 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Simple and effective procedures for the determination of Re, Os and Ir by radiochemical neutron activation analysis are presented. Those elements are separated individually by distillation (for Os) and anion exchange techniques (for Re and Ir) for a single specimen. Reproducibilities of the data obtained by the present procedures are evaluated by replicate analyses of the Allende meteorite sample, and are deduced to be 3% for Re, 6% for Os and 4% for Ir (1σ). Detection limits for the present procedures are calculated to be 1 ppb for Re, 20 ppb for Os and 5 ppb for Ir. These procedures were applied to Antarctic meteorites and proved to work very effectively for the determination of trace Re, Os and Ir in chondrite meteorites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02042947
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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