Materials Literature
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Ba x Sr 1- x TiO 3 ceramics have been synthesized by a conventional solid-state reaction for x =0.2, 0.4, 0.6, 0.8. The phase constitution was examined by X-ray diffraction. The microwave dielectric properties of Ba x Sr 1- x TiO 3 , such as the real part of the relative dielectric constant and loss factor, were measu…
This paper reviews recent theories of nonclassical, structured deformations and integral representations for their Helmholtz free energy. Energy minimizers for a body undergoing shearing at two different length scales and for a bar experiencing both smooth extension and macroscopic fractures are determined, and applic…
Using Raman spectroscopy we determined the van-der-Waals component of the low-frequency vibration in ropes of single-walled nanotubes at 171 cm—1. While Raman peaks in this frequency range are commonly believed to correspond to the pure radial breathing mode of a single tube, our pressure and temperature-dependent mea…
We report the results of a theoretical study of electron scattering by ${\mathrm{CO}}_{2}$ at incident electron energies ranging from 0.25 to 10 eV using the complex Kohn variational method. These are the first fully ab initio calculations to accurately reproduce the two dominant features observed in experiment, namel…
The effect of rare-earth elements such as La, Ho and Yb on the microstructure in BaTiO 3 ( A B O 3 ) with various Ba/Ti ratios was studied. The grain size changed markedly depending on the Ba/Ti ratio in the case of La- and Yb-doped BaTiO 3 . On the other hand, in the case of Ho-doped BaTiO 3 , the grain size changed…
A poly(aspartic acid) degrading bacterium (strain KT-1 [JCM10459]) was isolated from river water and identified as a member of the genus Sphingomonas. The isolate degraded only poly(aspartic acid)s of low molecular masses (<5 kDa), while the cell extract hydrolyzed high-molecular-mass poly(aspartic acid)s of 5 to 150…
The mechanism by which solvent exerts its effect during the process of crystallization is poorly understood. An important and ongoing problem is the uneven growth of the faces {011} and {01̄1̄} of α-resorcinol in water. Growth occurs mainly at the {01̄1̄} surface. In an attempt to determine the mechanism, molecular-dy…
The dynamics of the fragile glass-forming liquid diglycidyl ether of bisphenol-A was studied by depolarized Rayleigh-Brillouin light-scattering and photon correlation spectroscopy above the glass transition, in the temperature range from 261 to 473 K and in the frequency range from 1 Hz to 300 GHz. The structural (alp…
As a continuation of our previous work, this paper concentrates on two more complex 3D woven structures, i.e., orthogonal and angle-interlock structures, for industrial applications such as textile composites. Studying the features of these woven structures has led to the establishment of mathematical models to descri…
Abstract Hydrothermal synthesis of brookite was performed at 110-200 °C within 24 h using amorphous TiO2 and sodium salts as the starting material. Brookite was obtained as an almost single phase at 200 °C and TiO2 / NaOH mole ratio ≅ 1. By the results of XPS and UV-vis measurements, brookite was considered to be form…
Polycrystalline Pb(Zr,Ti)O 3 (PZT) thin films fabricated by a chemical solution deposition (CSD) process exhibited a conspicuous initial voltage shift in the D - E hysteresis loop toward the negative-bias field. It was concluded that the origin of the voltage shift was an internal bias field due to asymmetric space-ch…
Abstract A comprehensive experimental study was carried out to investigate the effects of (1) viscosity ratio, (2) temperature on the viscosity ratio, (3) extruder screw location, and (4) compatibilizers on the morphology of bisphenol‐A‐polycarbonate/acrylonitrile‐butadiene‐styrene (PC/ABS). Blends were prepared by ut…
A free-standing polyfuran (PFu) film has been successfully synthesized by electrochemical polymerization of furan at low potential (1.2 V vs Ag/AgCl) in a binary solvent system consisting of boron trifluoride−ethyl ether (BFEE) and additional ethyl ether (EE). The obtained polymer contains much less ring-opened compon…
Numerous papers have been published that include high-strain-rate experimental data obtained from Split Hopkinson Pressure Bar (SHPB) tests. There have been no standardized test specimens with differing dimensions and geometry. For this reason, it can be difficult to compare results of tests performed by other researc…
New non-symmetric dimesogens consisting of a cholesteryl moiety and an aromatic mesogenic unit interconnected through a pentamethylene spacer have been prepared. The aromatic units consist of two phenyl rings linked by carboxy, oxycarbonyl, ethylene, ethynylene, azo or Schiff's base groups. The mesomorphic and transit…
The reversible dimerization of the electrochemically or chemically generated cation radicals of diversely substituted tetrathienylenevinylenes ( 1 − 6 ) has been analyzed by concentration and temperature-dependent cyclic voltammetry, UV−vis, near-IR, and ESR spectroscopies, and time-resolved spectroelectrochemistry. F…
Theoretical descriptions of the molecular polarizability and second hyperpolarizability (α and γ) of the linear quadrupolar molecule are presented. By using a valence-bond and two charge-transfer states, three eigenfunctions of a quadrupolar molecule are obtained as linear combinations of these basis states. The analy…
Electronic transport and optical measurements in polycrystalline Pbl2 are reported as part of a study to evaluate the material for large area x-ray imaging applications. The films are deposited by vacuum evaporation with thickness 20–100 μm and have grain sizes of up to 10 μm. The room temperature hole drift mobility…
Numerical simulations of Liesegang systems are performed both with a prenucleation and a postnucleation model. Special interest is dedicated to two-dimensional morphological peculiarities of ring systems. With the prenucleation model, apparent bifurcations or branch points (anastomoses) can be created by adjacent trai…
Deformation and relaxation properties of hypercrosslinked polystyrene networks have been studied by thermomechanical method at a uniaxial compression using individual spherical beads of the polymer. The networks examined were prepared by postcrosslinking of highly swollen beads of a styrene-0.3% DVB copolymer with 0.3…