Materials Literature
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From adjustment gears for sprinkler systems to surgical scissors, from latchbolts to parking gears, the winners of the Metal Powder Industries Federation's (MPIF) 1998 part-of-the-year design competition represent further market breakthroughs for powder metallurgy (PM). The winning parts show successful conversions fr…
A heterojunction based on semiconductors with a chain crystal structure p -TlSe- p -TlInSe 2 was obtained. Liquid-phase epitaxy from TlSe melt on the natural (110) cleavage surface of a TlInSe 2 crystal was used. The structure obtained is sensitive to light and hard radiation. Some photoelectric properties of the hete…
Abstract The electrical properties of liquid crystal cells were estimated using various kinds of polyimide(PI) films. It is clarified that the PI structures and its layer structures affects electrical properties of LC cells. Based on the result, we developed a new alignment layers that exhibit a high voltage holding r…
Soils in the upland areas of Malaysia are mostly weathered (Ultisols and Oxisols), having high aluminum (Al), but calcium (Ca) and/or magnesium (Mg) deficient. Magnesium limestone is available in large quantities in Malaysia and is frequently being used to alleviate acidity in the upland soils. This study aimed at ass…
Photothermal effects in nematic liquid crystals (NLCs) on a dye-doped polymer film are investigated using a crystal rotation method combined with a pump-probe technique. We consider both the temperature dependence of the refractive indices of the NLCs and reorientation of the NLC molecules due to a temperature rise at…
Optical and spectral investigations confirmed the availability of phase transitions in [C2H5NH3]2CuCl4 at T1 = 364 K, Th2 = 356 K, T3 = 232 K. It has been found that the empirical Urbach rule is fulfilled in all phases. It is shown, that in the high-temperature phases skeletal vibrations of the C–N–C group interact wi…
The ppc gene, which encodes phosphoenolpyruvate carboxylase (PEPC) of an extremely thermophilic bacterium, Rhodothermus obamensis, was directly sequenced by the thermal asymmetric interlaced (TAIL) PCR method. An ORF for a 937 amino acid polypeptide was found in the gene. The ppc gene had a high G+C content (66.2 mol%…
Megasonic cleaning is one of the most widely used wet-cleaning processes in the semiconductor, hard disk and flat panel display industries. Presented results involve different and new techniques for introducing the high frequency ultrasonic energy in the cleaning bath. The effects of power, temperature and time on the…
The precise nature of the polyanions formed by the action of hydrochloric acid on sodium molybdate solutions has been studied by pH and conductometric measurements involving glass electrode and conductometric titrations. The inflections and breaks in the titration curves indicate the formation of para-Mo7O24(6-) and o…
We measured the composition of the droplets of the aerosols generated by ultrasound from aqueous solutions containing various concentrations of Triton X-100 (an octylphenyl ethoxylate nonionic surfactant) and d -glucose, the latter being a reference nonsurfactant solute. To prevent the sonochemical decomposition of th…
The influence of simultaneous addition of calcium and zirconium on the ignition of magnesium was investigated. The ignition behaviour and ignition prevention of magnesium by calcium and zirconium were also clarified. As soon as pure magnesium melts in the air, it ignites. However, magnesium alloy containing 0.5 mass%…
Original gatherings of a number of freshwater or brackish naviculoid taxa were identified and examined primarily from collections held in the Natural History Museum, London. Morphological descriptions are provided for each, and type slides have been designated. Because original material of Navicula ambigua Ehrenberg d…
The electric, dielectric, and thermoelectric properties have been studied for a series of ZnxMg0.8–xNi0.2Fe2O4 ferrite samples (with x = 0, 0.2, 0.4, 0.6, and 0.8) prepared using the usual ceramic technique. The experimental results indicated that the real dielectric constant ε′ and dielectric loss factor tan δ decrea…
Keywords: THRACE UNIVERSITY THESSALONIKI , GREECE MINISTRY OF PUBLIC WORKS SKIDS , RESISTANCE , PREDICTION , MEASUREMENT , TEXTURE , ROADS , SURFACES , TYRES , PAVEMENTS , WATER , FILM , EQUATIONS , REGRESSION , MODELLING , MATHEMATICAL , MODELS , FRICTION , INTERACTION , CORRELATION , REDUCTION , WET , WEAR , RESEARC…
Abstract A dialkylsilicon porphyrin Si(TPP)(CH2CH3)2 (1) (TPP=5,10,15,20-tetraphenylporphinato) reacted with dioxygen in the dark to give a bis(ethylperoxide) complex (5), from which a dihydroxysilicon porphyrin (Si(TPP)(OH)2, (6) was obtained upon reduction and hydrolysis. In contrast with the phosphorous analogue [P…
Several real-space indices and temperature factors are compared with respect to their correlation with atomic positional error and their ability to indicate atoms and residues with the worst of subtle errors. The best index, rED, is a correlation coefficient between model and map electron densities, similar to one pro…
Carbon deposition (also called coking or fouling) is of major concern in a range of industries in which process gases are carbon bearing. It can limit support catalyst lifetimes and can affect seriously the thermal hydraulic performance and/or mechanical integrity of plant structural components. This general overview…
Crystals of alcohol dehydrogenase from Sulfolobus solfataricus were grown in the Advanced Protein Crystallization Facility during the Life and Microgravity Sciences Spacelab mission on the US Space Shuttle. Large diffracting crystals were obtained by dialysis, whereas only poor-quality crystals were obtained by vapour…
The magnetic and electric hyperfine interaction and the relative fractions of dilute ${}^{57}\mathrm{Fe}$ nuclei on the four Co sites of ${\mathrm{Y}}_{1\ensuremath{-}s}{\mathrm{Co}}_{5+2s}$ have been investigated by M\"ossbauer spectroscopy as a function of the relative number $s$ of Y atoms substituted by Co dumbbel…
We have developed a 15‐inch TFT driven anti‐ferroelectric LCD with XGA resolution for monitor applications; this LCD is the largest of its type and has the highest resolution reported so far. Even in the case of XGA resolution, higher contrast ratio than 100:1 has been achieved by applying novel quasi‐DC driving schem…