Materials Literature
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Abstract Die pseudobinären Systeme ACl/PrCl 3 (A = NaCs) wurden mittels DTA neu untersucht. Folgende Verbindungen wurden gefunden (erstmalig nachgewiesene Verbindungen sind unterstrichen) K 3 PrCl 6 ; K 2 PrCl 5 ; Rb 2 PrCl 5 , Cs 3 PrCl 6 , , CsPr 2 Cl 7 . Messungen der Lösungsenthalpien, der freien Enthalpien für d…
The twist elastic constant K 22 in 5CB was determined as a function of temperature by the following four independent methods; (1) electric field static light scattering, (2) electric field dynamic light scattering, (3) angular dependence of the scattered light intensity combined with a K 11 or K 33 measurement, and (4…
The morphology, culture, and nutrition of four new species of apochlorotic diatoms (Nitzschia lucisensibilis, N. fluorescens, N. albicostalis and Hantzschia achroma) are described. A key to the seven apochlorotic diatoms, including the three known species (N. putrida, N. leucosigma and N. alba), is included.
This paper deals with one aspect of routing power and ground nets in integrated circuits composed of modules, where the nets are routed in the channels between the modules. Constraints are assumed on allowable voltage drops for maintaining proper logic levels and switching speed. A procedure for determining the width…
A model for the time behaviour of the internal bias field determined by dipole orientation of the transition metaloxygen vacancy type is presented. The measurements of a coarse grained BaTiO3 ceramic doped with 0.5 mol% Cr (grain size about 50μm, density 96%) show that the computer calculations describe satisfactorily…
Abstract The mechanical properties, i.e., Young's modulus, elongation, and tensile stress, were determined as functions of the molecular weight for films of poly(oxydi‐ p ‐phenylene pyromellitimide) prepared by thermal cyclization of the precursor poly(amic acid). The molecular weights of the samples were controlled b…
Graphite intercalation compounds are synthetic metals formed by inserting layers of atoms or molecules of a guest chemical species between the layers of carbon atoms that make up graphite. Because carbon occupies a middle position in the order of electronegativity of the elements in the periodic table, graphite welcom…
A series of lead alloy specimens comprising binary Pb‐Li, Pb‐Sn, Pb‐Sb, and quinary Pb‐(Al, Mg, Sn, Li) alloys were electrochemically tested. The corrosion cell was set up in 30% , using a mercury‐mercurous sulfate reference electrode. The passivity subsequently attained by the respective alloys depended primarily upo…
A bias field dependence of dielectric permittivity ∊'(E) of ferroelectric liquid crystals DOBAMBC and a mixture of DOBAMBC with Sm C substance in a planar Sm C* sample shows four different frequency regions. In two of them the unusual behaviour—increase of ∊' with increasing E—is observed. The first increase found in…
The dielectric and electrostrictive properties of relaxor ferroelectric Pb (Mg1/3Wb2/3)O3-based ceramics are strongly affected by the microstructure with emphasis on the grain size. Both the dielectric constant K and electrostrictive field coefficient (M) were found to increase with increasing grain size whereas the e…
Abstract A method is described for IR spectroscopy whereby combining statistical analysis with the quantitative method described by Slonimskaya et al. (1986) results in more informative spectra. Application of this method to dioctahedral micaceous minerals with vacant trans octahedra has revealed a number of peculiari…
The static dielectric constant ∊⊥ in the smectic A and the smectic C* phase of the ferroelectric liquid crystal 4-(3-methyl-2-chlorobutanoyloxy)-4'-heptyloxybiphenyl was determined. Strong pretransitional effects were observed in the smectic A phase. When the Goldstone mode contribution in the smectic C* phase is quen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantum effects in anisotropic semiconductor clusters: colloidal suspensions of bismuth sesquisulfide and antimony sesquisulfideB. F. Variano, D. M. Hwang, C. J. Sandroff, P. Wiltzius, T. W. Jing, and N. P. OngCite this: J. Phys. Chem. 1987, 91, 26, 6455–6458Publication Date…
Extended x-ray absorption fine structure (EXAFS) studies were conducted on catalysts containing platinum and rhenium, or palladium and rhenium, on alumina. The atomic ratio of rhenium to either platinum or palladium was close to one in the catalysts investigated. The metallic entities in the catalysts were characteriz…
1. The (R)-2-hydroxyglutaryl-CoA dehydratase system from Acidaminococcus fermentans was separated by chromatography of cell-free extracts on Q-Sepharose into two components, an activator and the actual dehydratase. The latter enzyme was further purified to homogeneity by chromatography on blue-Sepharose. It is an iron…
The recent discovery of a periodic distortion of the lattice structure of gamma -Fe precipitates in Cu motivated the authors to re-examine the magnetic structure of these precipitates using a neutron diffraction technique. They find that the spin structure is that of a longitudinal type-1 antiferromagnet as is well kn…
Abstract The effect of cold work on the transport of liquid methanol in crosslinked PMMA disks has been determined at temperatures from 35–56°C. Deformed samples absorb at fast rates with kinetics that approach those of Fickian diffusion. Undeformed samples sorb at lower rates and the kinetics tend toward those of Cas…
Abstract Fibers of organic polymers (polystyrene, cellulose acetate, and polypropylene) were formed by the rapid expansion of supercritical fluid solutions through a small diameter nozzle to ambient temperature and pressure. Solutions were prepared either by dissolving the polymer directly in room temperature pentane,…
The nucleotide and deduced amino acid sequences of the lacE and lacF genes, which code for the lactose-specific Enzyme II and Enzyme III of the Staphylococcus aureus phosphotransferase system, are presented. The primary translation products consist of a hydrophobic protein of 572 amino acids (Mr = 62,688) and a polype…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDivalent titanium chemistry. Synthesis, reactivity, and x-ray and neutron diffraction studies of Ti(BH4)2(dmpe)2 and Ti(CH3)2(dmpe)2James A. Jensen, Scott R. Wilson, Arthur J. Schultz, and Gregory S. GirolamiCite this: J. Am. Chem. Soc. 1987, 109, 26, 8094–8096Publication Da…