Materials Literature
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Results from the literature and unpublished ones of the present authors are summarized which are relevant to the mechanisms governing the mobility of dislocations in icosahedral Al-Pd-Mn quasicrystals. These results concern macroscopic deformation tests, conventional transmission electron microscopy, in situ straining…
Polypropylene/CaCO3 composites were homogenized in a twin-screw compounder and then injection molded into tensile bars. Six different fillers were used in a wide range of average particle sizes between 0.08 and 12 μm. Tensile and flexural properties were measured by standard techniques, while impact resistance was det…
In body centred cubic (bcc) crystals at low temperatures, the thermally activated motion of screw dislocations by the kink-pair mechanism governs the yield properties and also affects the strain hardening properties. In this work, the average strength of dislocation junctions is derived and numerically estimated in th…
The introduction of rubbery particles can be applied to enhance shear yielding and, consequently, the toughness of brittle amorphous polymers. The critical transition in these polymers from crazing to shear yielding requires a submicrometer- or even nanometer-sized rubbery phase. These can be obtained via coalescence…
Lithium chloride was found to be an effective and biocompatible catalyst for the ring-opening polymerization of lactide in the presence of hydroxyl-containing compounds. Ethylene glycol (EG) and methyl α-D-glucopyranoside (MGlc) were used as multifunctional initiators. The polymerization was carried out at 128°C in bu…
The quality of organic low-k methylsilsesquioxane (MSQ) film is degraded by the damage of oxygen plasma and hygroscopic behavior during photoresist stripping. In addition, the interaction between MSQ and copper is worth investigating. In this work, we have studied the H2 plasma treatment to improve the quality and enh…
Zinc oxide films were deposited on glass substrates in argon and oxygen atmosphere by dc reactive magnetron sputtering using a metallic zinc target. The influence of oxygen pressure and substrate temperature on the structure and optical properties of the films were systematically investigated and optimised the deposit…
During the past 15 years NASA has taken the lead role in exploiting the benefits of textile reinforced composite materials for application to aircraft structures. The NASA Advanced Composites Technology (ACT) program was started in 1989 to develop composite primary structures for commercial transport airplanes with co…
Results of experiments concerning nonlinear effects for elastic waves in metal rods with the crack-type defects are presented. The dependence of the nonlinear effect on the contact type is discussed. The crack has been modeled by cutting a rod and tightly filling the crack with metal plates. Two types of contact have…
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…