Zirconia-Alumina Ceramic Composites with Extremely High Wear Resistance
No abstracts
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Thermal and Structural Studies of Phase Transitions in Layered Perovskite SrBi2Ta2O9
Thermal and Structural Studies of Phase Transitions in Layered Perovskite SrBi2Ta2O9 , Myint, Akira Onodera, Seiji Kojima, Seiji Kojima, Haruyasu Yamashita, Haruyasu Yamashita, Toshihiko Takama, Toshihiko Takama
Crystal engineering: a case study using the 24 kDa fragment of the DNA gyrase B subunit from Escherichia coli
Site-directed mutagenesis was used to determine the efficacy of changing surface residues to improve crystal quality. Nine mutants of the 24 kDa fragment of the Escherichia coli DNA gyrase B subunit were produced, changing residues on the protein's surface. The mutations changed either the charge or the polarity of th…
Magnetic behavior ofEu2CuSi3:Large negative magnetoresistance above the Curie temperature
We report here the results of magnetic susceptibility, electrical resistivity, magnetoresistance (MR), heat-capacity, and ${}^{151}\mathrm{Eu}$ M\"ossbauer-effect measurements on the compound ${\mathrm{Eu}}_{2}{\mathrm{CuSi}}_{3},$ crystallizing in an ${\mathrm{AlB}}_{2}$-derived hexagonal structure. The results estab…
Crystallization within agarose gel in microgravity improves the quality of thaumatin crystals
To prevent crystals from moving in orbit and sedimenting upon their return to earth, the model protein thaumatin was crystallized in agarose gel in the Advanced Protein Crystallization Facility during the eight-day Space Shuttle mission STS-95 (November 1998). The quality of tetragonal crystals grown in microgravity w…
Monostabilization of Surface-Stabilized Ferroelectric Liquid Crystal Using Polymer Stabilization
Surface-stabilized ferroelectric liquid crystals (SSFLCs) fabricated by adopting polymer stabilization in terms of the UV photocure of doped photocurable monoacrylates with mesogenic side chains at a temperature where the LC medium is in the SmC * phase under the simultaneous application of a monopolar electric field,…
Kinetics of the Thermal Degradation of Rice Husks in Nitrogen Atmosphere
The use of agricultural residues for power production has generated increasing interest in the conversion of rice husks to higher quality fuels by thermochemical conversion processes such as pyrolysis, combustion, and gasification. However, the reliable design and operation of thermochemical conversion systems require…
Atomistic simulations of structures and mechanical properties of 〈011〉 tilt grain boundaries and their triple junctions in diamond
Atomic structures, energies, and stress distributions of symmetrical 〈011〉 tilt grain boundaries (GB's) and selected GB triple junctions (TJ's) in diamond as well as a multiply twinned diamond particle have been calculated using an analytic bond order potential function. In general, energies of 〈011〉 tilt GB's are abo…
Soil Development and Fertility Characteristics of a Volcanic Slope in Mindanao, the Philippines
Thirteen pedons representing the mountains, the upper footslopes, the lower footslopes, and the alluvial terraces of a volcanic slope in Mindanao, the Philippines were studied to understand relationships between the degree of soil development and fertility characteristics. Soils in the upper and the lower footslopes w…
Dielectric Properties of Al2O3-Doped Barium Strontium Titanate for Application in Phased Array Antennas
Effects of Al 2 O 3 doping on the dielectric properties of barium strontium titanate for application in phased array antennas have been studied. The grain size of the specimen is maximum for barium strontium titanate doped with 1 wt% Al 2 O 3 . The density and the real part of the relative dielectric constant decrease…
Thinning transitions in free-standing liquid-crystal films as the successive formation of dislocation loops
We describe a model for the layer-thinning transition in free-standing liquid-crystal films based on the successive, spontaneous formation of dislocation loops. As the film temperature increases and the smectic order and layer compressional modulus decrease, the condition for creating a dislocation loop of critical ra…
High Power Characteristics of Piezoelectric Ceramics in Pb(Mn1/3Nb2/3)O3–PbTiO3–PbZrO3 System
As one of high power characteristics of the piezoelectric ceramics in Pb(Mn 1/3 Nb 2/3 )O 3 –PbTiO 3 –PbZrO 3 system, the limit vibration velocity ( v max ), is defined as the vibration velocity that generate the fixed temperature rise was evaluated. From this system, a new material with a higher v max of 0.79 m/s whi…
Mechanism for the Off-Normal Emission of N2 in the Desorption-Mediated Reaction of NO on a Pd(110) Surface
Desorption of NO molecules from Pd(110) at 490 K mediates the emission of N 2 and N 2 O. The N 2 emitted at 490 K has a spatial distribution with a maximum intensity at 38° from the surface normal in the [001] direction, which is expressed by 0.9 cos 4.2 θ + 1.9 cos 46 (θ ± 38°). In contrast, the desorptions of NO and…
Atomistic simulations of structures and mechanical properties of polycrystalline diamond: Symmetrical 〈001〉 tilt grain boundaries
Atomic structures and energies of symmetrical 〈001〉 tilt grain boundaries (GB's) in diamond have been calculated over a wide range of misorientation angle using a many-body analytic potential, and for some selected short-period grain boundaries with tight-binding and first-principles density-functional methods. The gr…
Synthesis and enzymatic degradation of poly(ester-amide) stereocopolymers derived from alanine
Poly(ester-amide)s with L-alanine contents of 100 (LalaS-100), 90, 80, 70, 50, 30 and 0 were prepared by interfacial polycondensation of the mixture of 1,6-hexanediol diester of L- and D-alanine with sebacoyl chloride. The enzymatic degradation of the poly(ester-amide)s was followed by the weight loss in a buffer solu…
A second generation of mapping/reverse mapping of coarse-grained and fully atomistic models of polymer melts
Recently the rotational isomeric state model for unperturbed polymers has been combined with potential energy functions designed for the description of the interactions of pairs of molecules in the gaseous state for the purpose of reversibly bridging between simulations of coarse-grained (on-lattice) and fully atomist…
Topology and Spin Polarization in Sheetlike Metal(II) Polymers: [ML2X2] (M ˭ Mn, Fe, Co or Ni, L = Pyrimidine or Pyrazine and X = NCS or NCO)
The preparation and the structural and magnetic characterization of a series of sheetlike transition metal polymers of formula [ML2X2] [M ˭ Mn(II), Fe(II), Co(II) and Ni(II): L = pyrazine (pyz) and pyrimidine (pym); X = pseudohalide anion] are presented herein. The nature of the intralayer magnetic interaction is disc…
Backbone Dynamics of Azurin in Solution: Slow Conformational Change Associated with Deprotonation of Histidine 35
15N relaxation measurements have been performed on the type Iota blue copper protein azurin from Pseudomonas aeruginosa. The relaxation times show that one loop (residues 103-108) and one turn (residues 74-77) display fast internal motions. The rest of the protein is rigid with an average order parameter S(2) of 0.85…
Polymer additive migration to foods - a direct comparison of experimental data and values calculated from migration models for high density polyethylene (HDPE)
To reduce the amount of compliance testing for food contact polymers the use of migration modelling has been proposed. This study was conducted to provide valid data for the independent evaluation of two such diffusion-based models using a range of different high density polyethylene (HDPE) polymers and plastics addit…
Properties of Copper Films Prepared by Chemical Vapor Deposition for Advanced Metallization of Microelectronic Devices
Nucleation and growth of Cu by chemical vapor deposition (CVD) using hexafluoracetylacetonato‐Cu(I)‐trimethylvinylsilane [hfac(Cu)tmvs] on different physical vapor deposition (PVD) diffusion barriers, namely, tantalum (Ta) and tantalum nitride with x < 0.5), were studied by means of scanning and transmission electron…