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  • 1
    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 mixture of a Zr-Al metallo-organic compound and Al2O3 powder yields dense ZrO2-Al2O3 composite ceramics. The fraction of the tetragonal ZrO2 phase in as-sintered ZrO2-Al2O3 ceramics is almost 100% and the ZrO2 grains at about 500 nm in diameter are dispersed in the matrix. The ceramics have high fracture toughness and bending strength.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 23 (1988), S. 332-336 
    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 Zr-Al organometallic compounds have been spray-dried and heated at temperatures 600 to 1400°C to prepare ZrO2-Al2O3 composite powders. The powders consist of balloon-like particles 0.5 to 2 μm in diameter with homogeneously dispersed tetragonal ZrO2 grains 0.1 to 0.2 μm in diameter. The tetragonal fraction of ZrO2 in the composite powders is higher than that in the powders prepared from sols of Zr(OBun)4 and Al[OCH(CH3)2]3. The fraction is affected by the organofunctional group in the Zr-Al compounds.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 24 (1989), S. 3280-3284 
    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 Sialon powders have been prepared by heating mixtures of SiO2, Al2O3 2H2O and carbon in flowing nitrogen at 1470° C. The nitrogen content in the product powder increased with increasing added carbon, and was independent of both the flow rate of nitrogen gas and the surface area of pellet. The amount of SiO lost increased with an increase in the flow rate of nitrogen gas and surface area of the pellet and with a decrease in the amount of added carbon. A major part of the SiO evolved by the carbon reduction was trapped by carbon then consumed by carbon reduction and nitridation to form the sialon powder. The rest of the SiO was carried out of the system by the nitrogen gas. The amount of SiO lost and the nitrogen content can be estimated using the residual carbon content.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-4986
    Keywords: Helicobacter pylori ; heparan sulfate ; chondroitin sulfate ; proteoglycan ; glycosaminoglycan ; gastric cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Hs 198.St cells (a line derived from normal human gastric tissue), Hs 746T cells (a line derived from human gastric adenocarcinoma), and HeLa cells were used together with3H-labelledHelicobacter pylori, strain NCTC 11637 to determine if cell surface glycosaminoglycans could act as initial receptors for adherence of the bacteria. Although as much as 40% of the3H-labelled bacteria adhered to monolayers of the cultured cells, removal of glycosaminoglycans by prior treatment of the cells with heparitinase, heparinase, or chondroitin ABC lyase had no effect in modifying the adherence. Prior addition of heparan sulfate, heparin, or chondroitin/dermatan sulfate to bacteria had no effect on adherence, nor were bacteria released when these same glycosaminoglycans or these same enzymes were added to cultures already containing adherent bacteria. These results indicated that neither heparan sulfate nor chondroitin/dermatan sulfate are involved as receptors in the initial adherence step ofH. pylori to these cultured cells.
    Type of Medium: Electronic Resource
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  • 5
    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 Organic precursors containing Al and Zr atoms were synthesized from an aluminium chelate compound and zirconium n-butoxide. A ZrO2-Al2O3 composite powder was prepared by the thermal decomposition of these precursors. An amorphous phase exists to higher temperatures for this ZrO2-Al2O3 powder than for a comparable powder prepared from aluminium sec-butoxide and zirconium n-butoxide. In addition the tetragonal ZrO2 phase was stabler in this ZrO2-Al2O3 powder than in a comparison powder. The ZrO2 grains were 50–500 nm in diameter and were homogeneously dispersed in the Al2O3 matrix after heating at 1400 °C.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 6 (1987), S. 434-436 
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 8 (1989), S. 624-626 
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 259-269 
    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: Phosphate coupling agents, i.e., alkyl dihydrogenphosphates containing functional groups such as olefinic, chloro, methacryloxy, and mercapto, were synthesized and allowed to react with calcium carbonate filler suspended in an aqueous medium. The modification provided the filler with good dispersibility in mineral oil. Physical properties of the vulcanized rubbers loaded with the modified fillers were found to be influenced by the functional group introduced. For example, in peroxidecured ethylene-propylene-diene rubber (EPDM), the methacryloxy group was most effective, and the mercapto group significantly enhanced the physical properties of sulfur-cured styrene-butadiene rubber (SBR), while a saturated aliphatic phosphate was ineffective in both curing systems. Deposition of the coupling agent as calcium salt onto calcium carbonate surface was observed by scanning electron micrography. The novel approach for the surface modification of calcium carbonate filler is descussed in relation to the reinforcing effects on rubbery materials.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 32 (1986), S. 4229-4239 
    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 relation between tensile modulus of oriented polypropylene filled with calcium carbonate, and modified with poly(ethylene glycol) (PEG) or alkyl phenyl ether derivatives (APED) of different molecular weights was investigated. Upon stressing, voids appear in the composites material. For systems prepared with unmodified CaCO3, the void volume increases with an increase of filler content. For systems containing modified CaCO3, the void volume is smaller than the one of the reference material and decreases with an increase of PEG or APED molecular weights (which range from 400 to 4000 for PEG). Moreover, the relative modulus of oriented composites, Edc/Edr, are reasonably accounted by the void volume irrespective of filler content and modifier molecular weight, wherein Edc, Edr are respectively the modulus of oriented composites and the modulus of oriented polymer matrix.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 189 (1991), S. 13-22 
    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: Polyethylen (PE) und Poly(ethylen-co-vinylacetat) (EVA) wurden mit Calciumcarbonat gefüllt. Um die Haftung zwischen Polymerem und Füllstoff zu verbessern, wurde das CaCO3 vorher mit verschiedenen Alkyl-dihydrogenphosphatestern (APEn, CnH2n+1OPO(OH)2) unterschiedlicher Alkylgruppengröße (n = 1, 4, 10, 12, 16) überzogen. Der Einfluß der Alkylkettenlänge auf die Zugfestigkeit, die Bruchdehnung und die Hafteigenschaften zwischen Füllstoff und Polymermatrix wurden untersucht. In der PE/CaCo3-Reihe nahmen die Bruchdehnung, der Modul orientierter Proben und die Haftung zwischen Polymerem und Füllstoff mit ansteigender Alkylkettenlänge (n = 12) zu. In der EVA/CaCO3-Reihe war ein solcher Einfluß auf die Bruchdehnung nicht eindeutig feststellbar, dagegen nahm die Grenzflächenhaftung mit abnehmender Alkylkettenlänge zu (n ≦ 12).
    Notes: Poly(ethylene) (PE) or poly(ethylene-co-vinyl acetate) (EVA) and alkyl dihydrogen phosphate ester (APEn, CnH2n+1OPO(OH)2, n = 1, 4, 10, 12, 16) treated calcium carbonate (CaCO3) were mixed on a two roll mill. In order to improve the affinity of polymer-CaCO3 interface, the CaCO3 surface was treated through chemical reaction with various APEn types. The effect of carbon number of APEn on the tensile elongation and the adhesion properties between CaCO3 particles and polymer matrix was investigated. In the case of PE/CaCO3 series, tensile elongation, modulus of oriented samples and adhesion of polymer-CaCO3 interface increased with carbon number of APEn (n ≦ 12). In the EVA/CaCO3 series, the dependence of the tensile elongation on the carbon number of APEn was not clearly recognized; the adhesion at the phase interface was improved with the decrease of carbon number of APEn (n ≦ 12).
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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