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  • Chemistry  (10)
  • Polymer and Materials Science  (5)
  • GaAs  (2)
  • Collagen calcification  (1)
  • Critical Loads  (1)
Material
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Solid State Electronics 31 (1988), S. 435-438 
    ISSN: 0038-1101
    Keywords: GaAs ; electron-electron interaction ; hot electron ; intervalley transfer ; luminescence ; quantum well
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Solid State Electronics 31 (1988), S. 643-648 
    ISSN: 0038-1101
    Keywords: Electron-hole scattering ; GaAs ; carrier drag ; carrier transport ; electron-hole drag ; negative mobility ; photoconductivity ; quantum wells
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 50 (1992), S. 439-444 
    ISSN: 1432-0827
    Keywords: Collagen calcification ; Magnesium ; Hydroxyapatite-X-ray diffraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary X-ray diffraction, infrared absorption spectroscopy, and chemical investigation have been carried out on deproteinated samples of turkey leg tendon at different degrees of calcification. The inorganic phase consists of poorly crystalline B carbonated apatite. On increasing calcification, the apatite crystal size, as well as its thermal stability, increase while the relative magnesium content is reduced. On the other hand, synchrotron X-ray diffraction data clearly indicate that apatite lattice parameters do not change as the crystals get larger. At the last stage of calcification the crystal size, chemical composition, and thermal conversion of the apatite crystallites approximate those of bone samples, which have been examined for comparison. The results provide a quantitative relationship between relative magnesium content and extent of apatite conversion into B-tricalcium phosphate by heat treatment. Furthermore, they suggest that the smaller crystallites laid down inside the gap region of the collagen fibrils are richer in magnesium than the longer ones that fill the space between collagen fibrils.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-2932
    Keywords: Asia ; Acid Rain ; Energy ; Emissions ; Sulfur Deposition ; Critical Loads ; Sulfur Dioxide ; Conservation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In contrast to Europe and North America, air pollution in Asia is increasing rapidly, resulting in both local air quality problems and higher acidic depositions. In 1989, an east-west group of scientists initiated a multi-institutional research project on Acid Rain and Emissions Reduction in Asia, funded for the past two years by the World Bank and the Asian Development Bank. Phase I, covering 23 countries of Asia, focussed on the development of PC-based software called the Regional Air Pollution INformation and Simulation Model (RAINS-ASIA). A 94-region Regional Energy Scenario Generator was developed to create alternative energy/emission scenarios through the year 2020. A long-range atmospheric transport model was developed to calculate dispersion and deposition of sulfur, based upon emissions from area and large point sources, on a one-degree grid of Asia. The resulting impacts of acidic deposition on a variety of vegetation types were analyzed using the critical loads approach to test different emissions management strategies, including both energy conservation measures and sulfur abatement technologies.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 315 (1973), S. 983-985 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 314 (1972), S. 181-183 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 315 (1973), S. 980-982 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurden Polychelate von VO(II), Mn(II), Zn(II), Fe(III) und Cr(III) aus der Schiffschen Base des 5,5′-Methylen-bis-salicylaldehyds mit Anilin hergestellt. Alle Chelatpolymere sind amorph und unlöslich in herkömmlichen organischen Lösungsmitteln. Sie haben eine sehr geringe Löslichkeit in DMF. Die ersten drei Polychelate erwiesen sich als ungeladene Chelatpolymere, während die beiden letzten Polychelate sich infolge ihrer Leitfähigkeiten in DMF als ionisch erwiesen. Ihre möglichen Strukturen wurden durch Reflexionsspektroskopie und magnetische Messungen in Verbindung mit IR-Messungen ermittelt. Die thermische Stabilität, Reaktionsordnung und Aktivierungsenergie wurde für alle Polychelate aus der thermogravimetrischen Analyse bestimmt.
    Notes: Polychelates of VO(II), Mn(II), Zn(II), Fe(III), and Cr(III) were prepared from Schiff base of 5,5′-methylene bis-salicyladehyde with aniline. All the chelate polymers are amorphous and insoluble in common organic solvents. They have very little solubility in DMF. The first three polychelates are found to be noncharged chelate polymers while the last two polychelates are found to be ionic from their conductivities in DMF. Their probable structures were determined from reflectance electronic spectral and magnetic measurements in conjunction with infrared measurements. The thermal stability, order of reaction and activation energy for all the polychelates were determined from their thermogravimetric analyses.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 87 (1980), S. 87-94 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurden Chelatpolymere von Cu(II), Ni(I1) und Co(I1) mit 5,5′-Methylen-bis(salicylaldehydoxim) hergestellt. Die quadratische planare Struktur der Komplexe ergab sich aus IR- und elektronischen Spektren in Verbindung mit Messungen der magnetischen Suszeptibilität. Die Reihenfolge der thermischen Stabilität der Chelate wurde aus TG-Thermogrammen ermittelt und ergab \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm Co (II) 〉 Ni(II) 〉 Cu(II)}. $\end{document} Wie festgestellt wurde, erhöhen die Co(II)- und Ni(II)-Chelate ihre Koordinationszahl durch Reaktion mit Pyridin, das oberhalb und unterhalb des planaren Quadrats koordiniert wird. Der entstehende Komplex hat oktaedrische Struktur. Zur Bestimmung der Feldparameter wurde die Ligandenfeldtheorie benutzt.
    Notes: Chelate polymers of Cu(II), Ni(II) and Co(II) with bis-oxime of 5,5′-methylene bis(salicylaldehyde) have been prepared. The square-planar structure of the complexes was determined on the basis of infrared and electronic spectral measurements in conjunction with magnetic susceptibility measurements. The thermal stability of the chelates, obtained from the TG thermograms has the following order: \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm Co (II) 〉 Ni(II) 〉 Cu(II)}. $\end{document} Co(II) and Ni(II) chelates are found to increase their coordination number by interaction with pyridine at right angles to the plane of the parent molecule. The resulting complex is found to have octahedral structure. The ligand-field and nephelauxetic parameters have been determined from the spectra, using ligand-field theory of spin-allowed transitions which are found consistent with six-coordinate structure for these adducts.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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