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  • 1
    Electronic Resource
    Electronic Resource
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Using monolithic alumina ceramics as the reference, the thermal shock behavior of the hot-pressed alumina matrix ceramics with 3 mol% neodymium titanate was investigated. The thermal shock resistance of the materials was evaluated by water quenching and a subsequent three-point bending test to determine the flexural strength degradation. The hot-pressed composite exhibited a temperature differential of the thermal shock resistance 120°C higher than the monolith, mainly because of significantly improved fracture toughness.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 361-364 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The specific heat of nanocrystalline iron with grain size of 40 nm has been measured in the low-temperature range from 1.8 to 26 K. The anomalous specific heat behavior of nanocrystalline iron is compared with that of the normal polycrystalline iron. It is found that the electronic specific heat coefficient γ obtained at low temperatures decreases by about 50%. A quadratic temperature-dependent term associated with surface modes in the heat capacity has been clearly observed. A large enhancement of the specific heat at higher temperatures is interpreted as the Einstein oscillator contribution due to weakly bound atoms at the interfaces of the nanocrystals. © 1996 American Institute of Physics.
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 2697-2699 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The low temperature specific heat of Zr41Ti14Cu12.5Ni10Be22.5 alloys in glassy and crystalline states has been investigated. The glassy state of the alloy shows much larger specific heat than that of the crystalline state. The density of states at the Fermi level and Debye temperatures, θD of the alloys are determined. It is found that the density of states at the Fermi level for the glassy state is higher than that for crystalline state, the phenomenon is interpreted by localization of electrons in the glassy alloy. A much smaller value of θD in the glassy state indicates marked soften transverse phonons compared to its corresponding crystalline state. © 2001 American Institute of Physics.
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 1420-1427 
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A derivation of the gyrokinetic equation is presented which employs a set of gyrokinetic variables suitable for the neutral sheet geometry where the usual theories are not valid. A closed set of equations is obtained for the study of linear electromagnetic stability problems. Since the present theory avoids treating the complicated particle orbit directly, it can be used to study the plasma behavior in the neutral sheet geometry in space and the laboratory, once the distribution function and magnetic geometry are given.
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  • 5
    Electronic Resource
    Electronic Resource
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), S. 0 
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The compaction behavior of fine alumina powders with different particle sizes or bimodal particle-size distributions that are undergoing pressure filtration was investigated. Three alumina powders—average particle sizes of 0.2—0.86 μm—were compacted to a solids fraction of 62—65 vol% from suspensions at pH 3, which was the pH level at which the suspensions showed their lowest viscosity. When the powders of different average sizes were mixed, the suspensions showed better flowability, and the lowest viscosity was obtained when the fraction of fines was ∼30 vol% and pH = 3. The mixed-sized powder suspensions were compacted to higher density than the suspensions of unmixed fine or coarse powders, and the maximum density was obtained for mixed suspensions that had the lowest viscosity, despite the different particle-size ratio. Maximum densities of 72.5% and 75.0% were attained when the size ratios were 2 and 5, respectively. The compacts that were pressure-filtered from mixed suspensions exhibited a single-peaked pore-size distribution and a homogeneous microstructure, whereas the pore-size distributions of dry-pressed compacts were double-peaked. The sintering behavior of the compacts that were pressure-filtrated from bimodal powders exhibited significantly better sinterability and much-less linear shrinkage than the coarser powders and the dry-pressed powder compacts.
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  • 6
    Electronic Resource
    Electronic Resource
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Flexure creep and creep-recovery behavior were investigated for monolithic Al2O3 and 10-vol%-SiC-particle-reinforced Al2O3-matrix composites in an air atmosphere at temperatures of 1160°-1400°C. Two types of SiC particles were used: one has an average size of 2.7 µm and has an amount of SiO2 impurities per unit surface area that is one order of magnitude higher than the other, which has an average size of 0.6 µm. Compared to the creep behavior of monolithic Al2O3, the strain rate of the composites with the 0.6 µm SiC particles (denoted here as S-10) did not decrease; the composites with the 2.7 µm SiC particles (denoted here as L-10) exhibited excellent creep resistance. This difference was related to the microstructural features and the oxidation behavior of the composites: the Al2O3 grains in S-10 were mainly equiaxed, only ∼10% of the Al2O3 grains were elongated, and most of the SiC particles that resided at the grain boundaries or at triple-grain junctions were oxidized during creep, whereas the Al2O3 grains in L-10 were mostly irregularly shaped and elongated and most of the SiC particles were entrapped in the Al2O3 matrix grains, which prevented the oxidation of the SiC particles. These different microstructural features were associated with different amounts of SiO2 impurity content per unit surface area on the SiC particle surfaces. In addition, the monolithic Al2O3 showed no anelastic recovery when the load was removed; however, the composites exhibited significant anelastic recovery, especially for L-10. This phenomenon was attributed to the elongated grain morphology.
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  • 7
    ISSN: 0040-6031
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    FEMS immunology and medical microbiology 19 (1997), S. 0 
    ISSN: 1574-695X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Strains of Propionibacterium acnes, isolated from different kinds of orthopaedic and biomaterial-associated infections and from skin flora were shown to express binding of soluble as well as immobilized fibronectin. Among these 7 strains isolated from orthopaedic infections, 2 from breast prostheses, and 9 skin isolates, 2, 2, and 5 strains respectively bound immobilized fibronectin. The fibronectin binding was sensitive to protease and heat treatment, and was inhibited by a cell surface extract from one of the binding strains. In SDS-PAGE and autoradiography of cell surface extracts, a band corresponding to a MW of about 80 kD reacted with fibronectin and the 150 kD fragment of fibronectin. Binding to fibronectin and the 150 kD fragment of fibronectin could be inhibited with heparin. We thus present a first Fn binding protein of P. acnes, a surface exposed protein of 80 kD. None of the strains bound soluble collagen, and only one strain expressed weak binding of vitronectin and bone sialoprotein II.
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  • 9
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 5-8 
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: A novel and thermally stable hierarchically porous yttrium doped zirconiamaterial with crystallized framework has been synthesized in a facile process. XRD,nitrogen adsorption analysis, FESEM, FETEM, were used for the structuralcharacterizations. This novel hierarchically porous zirconia shows a well-definedordered macroporous structure, a broad distributed mesoviods, and a very uniformmesoporous pore-distribution. Small amount of yttrium can be helpful to increase thethermal stability of the prepared hierarchically porous zirconium oxide
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