Materials Literature
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Spark plasma sintering (SPS) was applied to the production of non-lead ferroelectric Bi 4 Ti 3 O 12 ceramics. A powder compact of a calcined oxide mixture was embedded in a mixture of ZrO 2 and Sb-doped SnO 2 powders in a carbon die and heated for a very short duration under a constant current of 450 A. This process l…
A series of SiC‐AlN compositions of 0, 10, 25, 50, 75, 90, and 100 mol% AlN were hot pressed at 2100°C for a 1 h soak at a pressure of 35 MPa under vacuum. 2H‐wurtzite SiC‐AlN solid‐solution structures were formed for compositions with 25‐100 mol% AlN. The associated lattice parameters for these solid solutions follow…
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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
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…
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…
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…
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,…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…