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  • 1990-1994  (7)
  • 1860-1869
  • 1993  (7)
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Material
Years
  • 1990-1994  (7)
  • 1860-1869
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Local molecular motion in polyurethane-poly(methyl methacrylate) interpenetrating polymer networks (1993)
    s.l. : American Chemical Society
    Macromolecules 26 (1993), S. 1869-1875 
    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/ma00060a012
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    T1, T2 and proton density measurements in the grading of cerebral gliomas (1993)
    Springer
    European radiology 3 (1993), S. 49-52 
    Details
    ISSN: 1432-1084
    Keywords: Brain tumor ; MRI ; T1 ; T2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The possibility that cerebral tumours may be graded by measuring T1 or T2 with magnetic resonance (MR) imaging was studied. A consecutive series of patients with subsequently verified gliomas was enrolled, and studied with MR. Patients who had prior surgical, chemotherapeutic or steroid treatment were excluded. Single slice multiple saturation recovery and multiple spin echo techniques were used to measure T1, T2 and proton density in the tumour. In 33 patients with cerebral gliomas there were 5 grade I, 12 grade II, 7 grade III and 9 grade IV. T1 and T2 values tended to be smaller in grade I gliomas than in grades II, III and IV gliomas. Relaxation parameters overlapped considerably in tumours with different grades. Proton density values did not show much change between different grades of gliomas. Relaxation parameters cannot be used to determine tumour grade reliably.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173524
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Undoped and indium-doped CdS films prepared by chemical vapour deposition (1993)
    Springer
    Journal of materials science 28 (1993), S. 5335-5339 
    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 Undoped and In-doped films of CdS were deposited at different temperatures by the chemical vapour deposition technique on glass and In-coated (30 nm) glass, respectively. Both kinds of film present a columnar microstructure, low porosity and good adherence to the substrate. The doped films have higher electron mobility values compared with the undoped ones. Shifts in the transmission spectra (Moss-Burstein effect) were observed with increased doping. Small crystals grew over the doped films during the deposition stage, mainly at the higher substrate temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00570086
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Application of short-lived isotopes spectrometry coupled with k0 standardization to the neutron activation analysis of geological materials (1993)
    Springer
    Journal of radioanalytical and nuclear chemistry 168 (1993), S. 133-144 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The described procedure is purely instrumental. The aim is to determine efficiently the elemental composition of geological materials by neutron activation, using short-lived isotopes. Our procedure requires the use of a gamma-spectrometric system fitted with a real time correction module for the counting losses and the quasi absolute k0-method. Consequently, the two constraints inherent in the analysis of short-lived isotopes, i.e. decreasing dead time counting and relative standardization were overcome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02040886
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Simultaneous determination of Ir and Se in K-T boundary clays and volcanic sublimates (1993)
    Springer
    Journal of radioanalytical and nuclear chemistry 168 (1993), S. 125-131 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Our instrumental analytical method for an ultra-sensitive determination of Ir and Se in sediments and volcanic emission products is based on epithermal neutron activation analysis (ENAA) coupled with multiparameter coincidence spectrometry. An adequate setting of the energy paths and of the multiparameter coincidence spectrometry. An adequate setting of the energy paths and of the multiparameter analyzer allows a simultaneous counting of75Se and192Ir coincidences. This tool has been used to analyse different sediments sampled at the Cretaceous-Tertiary boundary (KTB) and volcanic samples in order to discuss the extra-terrestrial or volcanic origin of the Ir anomaly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02040885
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Schwermetall- und chloridhaltige Filterstäube. I. Phasenanalysen und Modellversuche zum Recycling (1993)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 335 (1993), S. 255-261 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Flue Dusts Containing Heavy Metal Ions and Chloride.I. Phase Analysis, Model Experiments for RecyclingFour flue dusts from a cement factory, an electric-furnace steelmaking plant and a municipal waste plant were analyzed by powder diffraction methods. Chloride combines above all with alkali ions or heavy metal ions, especially yielding PbCl2 and KPb2Cl5. The controlled sublimation of these chloride compounds in open crucibles was developed and optimized in our laboratory. Between 850°C and 1150°C and at reaction times from 30 min up to 12 h, the chloride content decreases to below 0.1 wt-%. The sublimed phase mainly consists of alkali and lead chloride. Zinc is found in the flue dust as oxide and is enriched during this process. Recent investigations with a small waelz kiln give analogous results. With our procedure, the manufacturer by himself is able to exploit flue dusts containing a large amount of heavy metal elements and chloride which cannot be deposited. The remaining product contains mainly zinc oxide which can be recycled in the zinc industry or returned to the production process. The sublimed chloride compounds may be recycled in the potash industry.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19933350307
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Investigations for obtaining semi-interpenetrating polymer networks based on monomers of different reactivity toward radicals (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 48 (1993), S. 1183-1188 
    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: Classically, the one-step synthesis of interpenetrating polymer networks (IPNs) and related materials requires noninterfering polymerization modes to achieve distinct networks, held together by only physical entanglements. For the combination of (meth) acrylic and allylic monomers, both polymerizable by free radicals, a new in situ sequential synthesis for obtaining semi-IPNs is proposed. Using specific initiators that decompose at two different temperatures, refractive index measurements, Fourier transform infrared spectroscopy, and dynamic mechanical analysis have shown that neat species are formed and that the two monomers do not copolymerize. © 1993 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070480706
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    Paper (German National Licenses)
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