Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The degradative changes in silk are investigated with amino acid analysis and solubility under denaturing conditions (7M urea). These biochemical techniques use extremely small samples for quantitative analyses and are capable of detecting chemical alterations at the molecular level. The biochemical results are used t…
The chemistry of molten fluorides is traced from their development as fuels in the Molten Salt Reactor Experiment with important factors in their selection being discussed. Key chemical characteristics such as solubility, redox behavior, and chemical activity are explained as they relate to the behavior of molten fluo…
This paper presents the stem effect correction factors for the NE2561 and NE2571 ionization chambers calibrated in air and used at a depth in a phantom irradiated by medium-energy x-ray beams. The in air and in phantom stem effect correction factors were calculated as the ratios of the absorbed dose in the air cavity…
Three commonly used ferroelectric actuator and sensor materials, namely polyvinylidene fluoride copolymers, lead zirconate titanate piezoceramics (PZT), and lead magnesium niobate-lead titanate relaxors (PMN-PT) at low PT content, are characterized with respect to temperature and driving field amplitude. It is shown t…
Abstract The reactions of ninhydrin ( 1 ) with β‐ketoesters and β‐diketones were studied. Two kinds of products were observed, which were either simple adducts of the dicarbonyl compounds to the center carbonyl group of ninhydrin, or tricyclic indeno[1,2‐ b ]furans. Treatment of methyl 3‐aminocrotonate ( 2 ) with ninh…
High purity ceramic materials like alumina ceramics, which can be offered with novel formations and modifications using advanced processing techniques, offer a wide spectrum of enhanced properties such as high mechanical strength, wear resistance, corrosion resistance, capability to withstand high temperatures and the…
2-Thioxo-1,3-dithiole-4,5-dithiolate reacts stereospecifically with the cyclic sulfate ester of R,R-1,4-difluorobutane-2,3-diol by two nucleophilic attacks, ring opening of the cyclic sulfate ester at carbon and displacement of the nearer fluorine atom, to form a derivative of the 1,3-dithiolo[4,5-b]-1,4-dithiin ring…
Accelerated durability tests are commonly used with the intent of predicting service performance. To make these predictions it is necessary to extrapolate the accelerated data to service conditions. A review is given of a number of techniques and models used to extrapolate data from ageing and environmental resistance…
The thermolytic decomposition of citric acid in the presence of tin/lead solder has been investigated. The solid reaction products were first examined by solid-state 13 C NMR. The samples were then dissolved in D 2 O, and 1 H and 13 C 1D and 2D (HMQC, TOCSY) spectra were obtained. Results indicate the presence of a se…
An effective acceleration technique using digital feedback to control the flux waveform of a single sheet tester has been developed. In this technique, the waveform of the applied voltage is pre-estimated using the equivalent circuit equation. The convergence characteristic of the proposed method using the new techniq…
On the corrosion protection of carbon steel by sol-gel derived TiO2 coating under the illumination of light, the photoelectrochemical behavior of TiO2/steel system is investigated. The diffusion of Fe ions into TiO2 in the heat treatment of the coating process greatly degrades the photo-effect of TiO2 coating. An Fe o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature Effect on the Sonolysis of Methanol/Water MixturesDmitrii N. Rassokhin, Georgii V. Kovalev, and Lenar T. BugaenkoCite this: J. Am. Chem. Soc. 1995, 117, 1, 344–347Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inis…
Highly reactive and ultra-fine barium polytitanates (BaO-nTiO2, n= 4, 4.5, 5) with a particle size of 30–50 nm have been prepared by the citrate route. Solubility isotherms were calculated for the BaCO3-citric acid-H2O and TiO(OH)2-citric acid-H2O2-H2O systems at 25 °C to predict the optimum pH condition for preparing…
Novel 2,3,6,7,9,10-hexasubstituted phenanthrene derivatives have been synthesized, which showed broad enantiotropic columnar phases. A mixture of one representative bearing six (S)-2-methyl-3-oxa-decanoyloxy side chains with its 1,2,3,6,7,8-hexasubstituted structural isomer showed a tilted columnar phase and exhibited…
The optical and electrical conductivity behaviour of phases in the systems CsMIIX3(MII= Ge, Sn, Pb; X = Cl, Br, I) are explained by donation of electron density from non-bonding electron pairs on the MII metal into a conduction band formed by the overlap of halogen d states. The greater ionic character of the PbII red…
Some new photoresponsive azobenzenes (1–5) have been synthesized and characterized. On irradiation at 330 nm these systems undergo conversion from the E to the Z form to a varying extent which depends upon the nature and position of substitution on the azobenzene rings. They revert back to the E form on thermal isomer…
Ca4Y6(SiO4)6O:A (A = Pb2+, Eu3+, Tb3+, Dy3+) phosphors have been prepared by two methods: the sol-gel method and the conventional dry method. The crystallization processes and the luminescence characteristics of the phosphors were studied. The sol-gel method features low-temperature formation of the phosphor, leading…
Aims and Scope
Abstract Ultisols and Oxisols in Malaysia are characterized by low pH and high Al, with their subsoils usually deficient in Ca, Mg, or both. An experiment, using polyvinyl chloride columns, was conducted to study chemical reactions in a representative Ultisol and Oxisol from Malaysia resulting from application of grou…
The acidic sites in Cu/ZSM-5 catalysts active for the reduction of nitrogen oxides under lean conditions have been investigated by examination of the IR spectrum of adsorbed pyridine: proton and sodium forms of the zeolite have also been studied to provide reference results. As expected, H-ZSM-5 exhibited both Lewis a…