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  • 1
    Electronic Resource
    Electronic Resource
    Head and backbone of the Early Cambrian vertebrate Haikouichthys (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 421 (2003), S. 526-529 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Agnathan fish hold a key position in vertebrate evolution, especially regarding the origin of the head and neural-crest-derived tissue. In contrast to amphioxus, lampreys and other vertebrates possess a complex brain and placodes that contribute to well-developed eyes, as well as auditory and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01264
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  • 2
    Electronic Resource
    Electronic Resource
    Primitive deuterostomes from the Chengjiang Lagerstätte (Lower Cambrian, China) (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 414 (2001), S. 419-424 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Cambrian fossil-Lagerstätten (sites of exceptional fossil preservation), such as those from Chengjiang (Lower Cambrian) and the Burgess Shale (Middle Cambrian), provide our best window into the Cambrian ‘explosion’. Such faunas are known from about 40 localities, and have yielded a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35106514
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  • 3
    Electronic Resource
    Electronic Resource
    Ancestral echinoderms from the Chengjiang deposits of China (2002)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 430 (2002), S. 422-428 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Deuterostomes are a remarkably diverse super-phylum, including not only the chordates (to which we belong) but groups as disparate as the echinoderms and the hemichordates. The phylogeny of deuterostomes is now achieving some degree of stability, especially on account of new molecular data, but ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02648
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of low cycle fatigue on deformation twins in commercial purity titanium (1997)
    Springer
    Journal of materials science 17 (1997), S. 211-214 
    Details
    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
    URL: http://dx.doi.org/10.1023/A:1006532227698
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  • 5
    Electronic Resource
    Electronic Resource
    Wear of ceramic particle-reinforced metal-matrix composites (1995)
    Springer
    Journal of materials science 30 (1995), S. 1967-1971 
    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 Wear experiments have shown that when the applied normal stress exceeds a critical value, a transition occurs from the regime of mild wear to that of adhesive wear. As a result, the wear rate of particle-reinforced aluminium composites increases by a hundred-fold. Based on dislocation and delamination theories, a criterion is proposed for determining the critical transition load, and a quantitative model is developed for adhesive wear in a wear system of a steel disc sliding against aluminium matrix composite pins. Experimental results of four kinds of metal-matrix composites confirm the validity of the criterion and the model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00353019
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  • 6
    Electronic Resource
    Electronic Resource
    Particle effects on friction and wear of aluminium matrix composites (1995)
    Springer
    Journal of materials science 30 (1995), S. 5999-6004 
    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 Particle effects on friction and wear of 6061 aluminium (6061 Al) reinforced with silicon carbide (SiC) and alumina (Al2O3) particles were investigated by means of Vickers microhardness measurements and scratch tests. Unreinforced 6061 Al matrix alloy was also studied for comparison. To explore the effect of heat treatment, materials subjected to three different heat treatment conditions, i.e. under-aged, over-aged and T6, were used. Multiplescratch tests using a diamond and a steel indentor were also carried out to simulate real abrasive wear processes. Vickers microhardness measurements indicated that T6 heattreated composites had the highest hardness. Single-scratch tests showed that the variation of friction coefficient was similar to that of Vickers hardness and the peak-aged composites exhibited the best wear resistance. The wear rate of fine particle-reinforced composites was mainly affected by hardness. However, the wear rate of large particle-reinforced composites was influenced by both the hardness and fracture of the particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01151519
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  • 7
    Electronic Resource
    Electronic Resource
    Wear of ceramic particle-reinforced metal-matrix composites (1995)
    Springer
    Journal of materials science 30 (1995), S. 1961-1966 
    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 Pin-on-disc dry sliding tests were carried out to study the wear mechanisms in a range of metal-matrix composites. 6061-aluminium alloys reinforced with 10 and 20 vol% SiC and Al2O3 particles were used as pin materials, and a mild steel disc was used as a counterface. A transition from mild wear to severe wear was found for the present composites; the wear rate increased by a factor of 102. The effects of the ceramic particles on the transition load and wear with varying normal pressure were thoroughly investigated. Three wear mechanisms were identified: abrasion in the running-in period, oxidation during steady wear at low load levels, and adhesion at high loads. A higher particle volume fraction raised the transition load but increased the wear rate in the abrasion and adhesion regimes. Increase of particle size was more effective than increase of volume fraction to prolong the transition from mild wear to adhesive wear. The reasons for different wear mechanisms were determined by analyses of the worn surfaces and wear debris.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00353018
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  • 8
    Electronic Resource
    Electronic Resource
    Anelastic and dielectric relaxations in CuO in the temperature range 90–160 K (1994)
    Springer
    Journal of low temperature physics 96 (1994), S. 347-353 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Internal friction and dielectric loss measurements, x-ray diffraction analysis and tensile tests as a function of temperature were carried out in CuO. Data from the experiments show that no phase transition or phase-like transition occurs between 90 K and 160 K instead, in this temperature range both internal friction and dielectric loss measurements display a relaxation peak with an activation of 0.23±0.01 eV. It is concluded that the behaviour of the high Tc superconductors with Tc 〉 80 K is not related to CuO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00754744
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  • 9
    Electronic Resource
    Electronic Resource
    Incipient fluidization at different temperatures and powder characterization (1987)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 33 (1987), S. 500-502 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690330317
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis and properties of new copolymers containing hindered amine (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 61 (1996), S. 1405-1412 
    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: Eight new copolymers containing hindered amine (HA) were synthesized by copolymerization of vinyl monomers [styrene (St), methyl methacrylate (MMA)] with new functional monomers produced by reaction of 4-amino-2,2,6,6-tetramethylpiperidine (ATMP) and epoxy compounds containing double bond, and mixture copolymerization of vinyl monomers (St and MMA) with a mixture of ATMP and above epoxy compounds. The structure of these new copolymers were characterized by IR, NMR, and elemental analysis. The properties of these new copolymers were described and their photoprotecting effectiveness examined. Experimental results indicate that they possess high photoprotecting effectiveness comparable to or higher than that of a commercial polymeric HALS “PDS.” © 1996 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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