Materials Literature
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Abstract Parkinsonite, ideally (Pb,Mo,□) 8 O 8 Cl 2 , is a new mineral from the Merehead Quarry, Cranmore, Somerset, England. It occurs as compact clusters or patches of red to purplish red bladed crystals, which have an adamantine lustre and a perfect {001} cleavage and occupy fractures and cavities in carbonate vugh…
A new hybrid device composed of a magnetostrictive amorphous FeSiB film on piezoelectric PZT substrate is described. DC and AC electric fields were applied to the PZT substrate and the magnetic properties of the magnetostrictive film were observed. Both the initial permeability and the coercive field of the film chang…
Abstract Crystallization, melting, and morphology of a thermoplastic polyimide (New‐TPI) containing pyromellitic dianhydride (PMDA) and 3,3'‐bis(4‐aminophenoxy) biphenyl diamine (33BAPB) moieties have been studied. This material showed a glass transition temperature ( T g ) of 250°C, an equilibrium melting temperature…
The influence of the structurally similar additives, o-chloronitrobenzene (o-CNB), p-chloronitrobenzene (p-CNB), p-dichlorobenzene (p-DCB), and p-dinitrobenzene (p-DNB), on the morphology of m-chloronitrobenzene (m-CNB) crystals has been investigated theoretically and experimentally. Both experiments and predictions c…
A new technique for the fabrication of thin patterned layers of porous polycrystalline silicon (polysilicon) and surface micromachined structures is presented. First, a multilayer structure of polysilicon between two layers of low-stress silicon nitride is prepared on a wafer of silicon. Electrochemical anodization wi…
Electrical conductivity measurements were carried out in the system by a four‐point dc method. The conductivities of and are 0.016 and 1000 Ω −1 cm −1 at room temperature and 0.759 and 250 Ω −1 cm −1 at 1000°C, both in flowing oxygen. The sample densities are 72 and 52% of the theoretical value, respectively. is a sem…
The effect of the pressure up to 1.4 GPa on the Curie temperature T/sub c/ in the R/sub 2/Fe/sub 17/ intermetallics with R=Nd, Er and Y was measured using a low field susceptibility technique. The identical character of the temperature dependence of susceptibility X(T) of the R/sub 2/Pe/sub 17/ intermetallics observed…
Serine transacetylase from Salmonella typhimurium was purified to near homogeneity. A complete initial velocity study in both reaction directions suggests that the enzyme catalyzes the conversion of acetyl CoA and L-serine to O-acetyl-L-serine (OAS) and coenzyme A (CoASH) by a ping pong bi bi kinetic mechanism. Initia…
The process of diffusion bonding between nanometre-sized zinc oxide crystallites in vacuum-deposited films is observed dynamically at atomic resolution by transmission electron microscopy for the first time. It is found that the nanocrystallites, having clean surfaces, bond without any solders at ambient temperature,…
A new device was used to achieve focused tissue ablation by shockwave induced cavitation. The device produced a half cycle of negative pressure followed by a shock wave, thus enhancing cavitation. Twenty eight New Zealand rabbits were treated. Therapeutic ultrasound was targeted at the centre of the liver under ultras…
The effect of effective rolling strain, in the range 0-0.147, on the core loss, hysteresis loss, eddy current loss, ac and dc permeabilities of a lamination steel has been investigated. It was found that both core loss and hysteresis loss increased with the square root of strain. However, eddy current loss decreased w…
Abstract Quantitative structure–property relationship techniques were applied to develop a predictive method for autoignition temperatures of a wide range of organic molecules, including hydrocarbons, alcohols, phenols, ethers, aldehydes, ketones, acids, amines, esters and halogenated compounds. Multivariate linear re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEXAFS Evidence That the CuCl64- Ion in (3-Chloroanilinium)8(CuCl6)Cl4 Has an Elongated Rather Than Compressed Tetragonal GeometryPaul J. Ellis, Hans C. Freeman, Michael A. Hitchman, Dirk Reinen, and Burghard WagnerCite this: Inorg. Chem. 1994, 33, 7, 1249–1250Publication Dat…
N-Acetylglutamate kinase (AGK) and N-acetyl-gamma-glutamyl-phosphate reductase (AGPR) function as two separate mitochondrial enzymes, but are encoded by a single nuclear gene in several fungi. The Neurospora crassa arg-6 gene encoding these enzymes has been cloned and sequenced, and the enzymes responsible for process…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadiative Association Reactions of Silicon and Transition-Metal Cations with the PAH Compounds Benzene, Naphthalene, and AnthraceneRobert C. Dunbar, Guy T. Uechi, and Bruce AsamotoCite this: J. Am. Chem. Soc. 1994, 116, 6, 2466–2470Publication Date (Print):March 1, 1994Publi…
The electrical impedance measured at p‐type and highly doped n‐type Si electrodes in solutions in the potential range of pore formation has been interpreted using a basic model. This model includes two electrochemical reactions (hole capture and electron injection) followed by a chemical oxidation reaction, and accoun…
Using Variational Density Functional Perturbation Theory, the dielectric and effective charge tensors of cubic Barium Titanate have been calculated as second derivatives of the total energy with respect to electric field and phonon perturbations. We found a dielectric constant εoo=5.60 and the following effective char…
A new more complete theory for energy exchange processes in electron emission is formulated. It is found that the tunneling contribution to the availability of vacant states is necessary to explain the replacement process occurring in the emitter region. The introduction of the tunneling states now makes it possible t…
Bright visible fluorescence was emitted from Er 3+ -doped halide phosphors and ErX 3 (X=Br, I), under 1.5 µm laser diode (5 mW) excitation. While green fluorescence was predominant with chloride ( BaCl 2 :Er) and bromide ( YBr 3 :Er), yellowish fluorescence was observed with iodide ( YI 3 :Er) and fluoride ( YF 3 :Er)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLight Scattering Studies of Block Ionomer Aggregation Characteristics in Nonpolar SolventZukang Zhou, Dennis G. Peiffer, and Benjamin ChuCite this: Macromolecules 1994, 27, 6, 1428–1433Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Publis…