Materials Literature
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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…
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…
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…
Using a first-order perturbation theory, we have studied the phase diagram of a binary mixture of hard spheres for different values of the size ratio. Recent models for the two-body depletion potential between large spheres are used to take into account the role of the small spheres. The theory predicts a complex phas…
The genes encoding NAD(+)-dependent alanine dehydrogenases (AlaDHs) (EC 1.4.1.1) from the Antarctic bacterial organisms Shewanella sp. strain Ac10 (SheAlaDH) and Carnobacterium sp. strain St2 (CarAlaDH) were cloned and expressed in Escherichia coli. Of all of the AlaDHs that have been sequenced, SheAlaDH exhibited the…
One avenue being pursued in the development of dislocation-based models of plasticity is the explicit simulation of the dynamics of dislocations, based on the recognition that such dislocations are the carriers of plasticity. The construction of models of dislocation dynamics requires insights into both the nucleation…
The influence of block copolymers (BCP) and interfacial reaction on the deformation of 30−100 μm polymer drops inside an immiscible polymer matrix was visualized in a parallel plate, counterrotating apparatus. Symmetric diblock copolymers were blended into polypropylene (PP), poly(methyl methacrylate) (PMMA), and poly…
Bicrystals of ZnO without intergranular additives were synthesized to elucidate the effect of Co and Mn doping on the varistor properties of ZnO ceramics. Nonlinear current-voltage ( I – V ) characteristics due to the formation of an interfacial barrier were observed in bicrystals doped with Co or Mn, while the nondop…
We have used inelastic-neutron-scattering measurements to investigate the magnetic excitations in a layered manganite ${\mathrm{La}}_{1.2}{\mathrm{Sr}}_{1.8}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ which shows colossal magnetoresistance behavior. We have measured the dispersion of both the acoustic and the optic modes along…
For many centuries, materials were discovered, mined, and processed in a largely serendipitous way. However, the characterization of the atom and the progress made in x-ray diffraction during the early years of this century started a quest for a theory of materials in terms of their atomic constituents. Later decades…
Raman scattering studies of lead zirconate titanate Pb(Zr x Ti 1- x )O 3 (PZT), 0.10≤ x ≤0.80, and Nd-modified lead titanate Pb 1-3 y /2 Nd y TiO 3 (PNT), y =0.02, 0.10, bulk ceramics were carried out at ambient temperatures between 4.2 and 297 K. Our measurements reveal splitting of the E ⊕ B 1 symmetry peak at low t…