Materials Literature
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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…
The solute redistribution law that predicts non-equilibrium phase constitution in compositionally cored binary alloys is usually attributed as Scheil's equation. Earlier studies on this subject by G. H. Gulliver are occasionally cited but are thought by some to be either approximate or incomplete. It is shown that Gul…
Core levels of silicon and carbon in the hexagonal form of silicon carbide have been studied by x-ray photoelectron spectroscopy. For this purpose, zirconium Lα (energy = 2042.4 eV) and magnesium Kα (energy = 1253.6 eV) radiations have been employed. The XPS data in the silicon 1s, 2s, 2p, and Auger KLL, and carbon 1s…
Considerable effort has gone into developing polymer formulations and cable designs to minimize failures through water tree growth. However, diagnostic techniques still are required to enable the estimation of the level of damage present within a service cable. This paper reports on progress regarding the application…
Optical diagnosis for aged mica-epoxy insulation of HV (3.0 to 6.6 kV), enclosed induction motors used in compressors has been studied. The developed optical fiber sensor consists of two optical fiber cables (one for light transmission, the other for light reception; each /spl sim/3 m long), two types of laser diodes…
The existing approaches to the detection of precipitation are largely based on room temperature measurements on quenched samples. However, the direct measurement of precipitation kinetics at high temperatures is also possible through analysis of the mechanical properties of the specimens. In this work, a creep method…