Materials Literature
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This paper describes the development and optimization of chiral, nonpolar media with large second-order nonlinear optical responses. We employ molecular engineering, quantum-mechanical sum-over-states theory, and measurements of molecular hyperpolarizability by means of Kleinman-disallowed hyper-Rayleigh scattering in…
Impact tests at low temperatures were carried out, aimed at comparing the response of five spheroidal graphite (SG) cast iron with different microstructures and to analyze the influence of the solidification structure size. "Y" blocks with two different thicknesses (13 and 75 mm) were cast using the same industrial me…
Attempts have been made to evaluate the degree of bioadhesion and biocompatibility of a synthesized urethane prepolymer with specially tailored microstructure. Wetting behaviour and extent of interfacial adhesion of the prepared prepolymer towards biological substrates were examined by in vitro methods. The former was…
SiC/SiC composite material is one of the candidates of plasma facing and structural materials for a fusion reactor. In an inertial fusion reactor and a magnetic confinement fusion reactor, interactions of solid and liquid breeder materials as well as coolant materials with various structural materials are considered t…
It has been shown experimentally in a single-layer microwave absorber that a matching frequency can be adjusted in the frequency range from 7.7GHz to 9.4GHz. A reflection loss above -40dB or more in maintained by changing the mixing ratio of magnetic and dielectric material in the composite. Complex relative permeabil…
Three-dimensional computer models were used to simulate transmission electron micrographs in order to determine the effects of changes in microfibril orientation and arrangement on the appearance of ultrastructural images based on thin sections. It is shown that the tangential fibrillar texture commonly associated wit…
Crystalline PbTiO 3 thin films were successfully deposited on (111)‐oriented Pt/Ti/SiO 2 /Si and on (200)‐oriented Pt/SiO 2 /Si by metalorganic chemical vapor deposition at a substrate temperature of 400°C, using a β‐diketonate complex of Pb(tmhd) 2 (tmhd = 2,2,6,6‐tetramethyl‐3,5‐heptanedionate) and titanium isopropo…
A ZK60 alloy was subjected to severe plastic deformation by torsion straining under high pressure at ambient temperature. The data of microhardness measurements, X-ray analysis and TEM observation showed that intense plastic straining resulted in formation of nanometer-scale structure characterized by presence of high…
Magnetic refrigeration has drawn much attention because of its greater efficiency and higher reliability than the traditional gas-cycle refrigeration technology. Recently, a kind of new materials with a giant magnetocaloric effect in the subroom temperature range, Gds(SixGe1-x)4, was discovered, which boosts the searc…
For ceramic materials, the statistical distribution of defects is closely connected to the fracture stresses. This relationship has been used to derive the distribution of flaw sizes and their positions from different fracture experiments. Reversely, fracture stresses were predicted from the measurement of flaw popula…
The effect of filler loading and bonding agent on the dynamic properties and swelling behaviour of bamboo fibre filled natural rubber composites were carried out. Bamboo fibre was used as a filler and the loading range was from 0 to 50 phr . Dynamic properties were determined using a Monsanto moving die rheometer (MOR…
Semiconductors that are based on uranium dioxide (or other actinide compounds) appear possible and could offer significant improvements in performance as compared to conventional Si, Ge, and GaAs materials. The energy band gap (forbidden band gap) for uranium dioxide (UO2) lies between Si and GaAs at the optimum of th…
r-BS was synthesized under high pressure/temperature conditions. Rietveld analysis of the powder X-ray diffraction data was performed by applying the structure model of GaS 3R (space group: R3m) with the lattice parameters of ahex = 3.05223(7) Å and chex = 20.4119(5) Å The crystal structure of r-BS was revealed to be…
Yarn-pullout behavior from a woven fabric is an important indicator of the mechanism of yarn interactions within the fabric. An analytical model is presented to describe the yarn-pullout behavior from woven fabric. This model is based on the free vibration caused by the orthogonal threads and can describe the motion o…
The bimetallic compound [{Cu(ept)}3Fe(CN)6](ClO4)2·5H2O [ept = N-(2-aminoethyl)-1,3-diaminopropane] has been prepared from the reaction of Cu(ClO4)2·6H2O, ept and K4[Fe(CN)6]·3H2O in water and its crystal and molecular structure has been determined. The structure consists of a two-dimensional network formed by [{Cu(ep…
Dilute aqueous solutions of three different calcium salts have been compared for their effectiveness as wash treatments for stabilizing the cellulose of paper objects. Treated paper samples were evaluated for chemical changes resulting from the treatment and from subsequent accelerated thermal aging. The extent of alk…
Dimerization of a new styrylstilbazole ligand through non-covalent interactions leads to polycatenar calamitic supramolecular structures with liquid crystalline properties.
The crystal structure of the new germanium selenide Ge4Se9 has been determined by powder X-ray diffraction. It shows a new feature for this class of compounds; corner sharing of tetrahedra via Se2 dimers with short Se–Se bonds. Structurally, Ge4Se9 is related to GeSe2 in that the edge-sharing tetrahedra in ambient pre…
Undoped ZnO films were deposited on Si substrates by DC reactive sputtering. The samples were annealed in air, pure O2 (1atm) and pure N2 (1atm) at 850℃,950℃,1000℃ for 1h. The X-ray diffraction patterns of the as-deposited and annealed samples all have a widened diffraction peak of ZnO (002). It is evident that all th…
The entropic contribution to the redox energetics of the grossly disordered high-temperature phase SrFeO3−δ is derived from the heat capacities of SrFeO2.500, SrFeO2.725 and SrFeO2.833 determined by adiabatic calorimetry. All three samples are structurally and magnetically ordered at low temperatures and the calorimet…