Materials Literature
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For the first time it has been demonstrated that polycrystalline Co films (10–300 nm) of hcp single phase can be produced on SiO2 glass substrates by a gas-flow-sputtering technique. The hcp Co films are obtained at substrate temperatures below 620 K and fcc Co films are obtained above 720 K. A mixture of hcp and fcc…
A series of novel perfluorononenyloxy group containing polyarylates were synthesized by a high-temperature solution condensation of 5-(perfluorononenyloxy)-isophthaloyl chloride (II) with various aromatic diols in o-dichlorobenzene. All the polyarylates were amorphous and readily soluble in many organic solvents such…
The mechanical behavior of nonwoven geotextiles in soil-fabric interaction is in vestigated through laboratory experiments and theoretical analysis. A computer model is presented to simulate geotextile performance in pullout tests. The model parameters are based on single fiber properties and the fiber orientation dis…
Abstract Melts of aromatic carboxylic acids are found to be excellent reaction media for 1‐pot high molecular weight polyimide synthesis from diamines and tetracarboxylic acid dianhydrides. No reversible reaction of polyamic acids (PAA) formation was observed. The effect of the reactivity equalization was observed for…
Oxazoline is a very interesting functionality for reactive extrusion and other applications. In this paper, we report the possibility of chemically transforming nitrile group attached to a copolymer of styrene and acrylonitrile (SAN) to oxazoline group using 2-aminoethanol (AE). The chemical modification of SAN with A…
The spectroscopic behavior of Sm3+ ions is investigated in monoactivated and coactivated (with cerium) glasses obtained by the direct sol-gel-glass transition. It is shown that the majority of the Sm3+ ions form optical centers of the same type, whose luminescence spectral characteristics depend weakly on the concentr…
We compare experimentally observed electron energy loss spectra (EELS) of uranium dioxide UO2 and nickel monoxide NiO with the results of ab-initio calculations carried out by using a method combining the local spin density approximation and the Hubbard U term (the LSDA + U method). We show that by taking better accou…
Abstract Rigid PVC extruded construction products take many forms. Typical are house siding, window profiles, storm doors, pipe, fencing, and various accessory items generrally used for installation. In addition to these solid products, foam or cellular rigid PVC materials are entering the marketplace as substitutes f…
Protein-on-silicone and silicone-on-protein films were made by the sequential coating of the human serum albumin (HSA) onto silicone films on glass or vice versa. The silicones used were either trimethylsilyl-terminated poly(dimethylsiloxane) (unfunctionalized PDMS) or (triethoxysilyl)propyl-terminated poly(dimethylsi…
Abstract Two common approachs to flame retard flexible PVC are phosphate ester plasticizers and antimony oxide. When used individually, each displays excellent flame suppressing characteristics. However, the combination of the two has been reported to show lower than expected flame resistance. Zinc borate plays a syne…
Measurements were made of the transition resistivities of an aluminum-porous silicon contact and the resistivity of the surface region of the porous material after short-term annealing in an inert medium at temperatures between 300 and 550 °C. It was shown that the parameters of the contacts are determined by the pore…
Bianisotropic media may be characterized as a general class of linear media which exhibit so-called magnetoelectric coupling between the electric and magnetic fields. Bianisotropic composites are attracting considerable attention in view of their potential usefulness and new fundamental problems. A bianisotropic cryst…
The phosphorylated form of the N-terminal domain of enzyme I of the phosphoenolpyruvate:sugar phosphotransferase system of Escherichia coli has been investigated by one-bond and long-range 1H-15N correlation spectroscopy. The active site His 189 is phosphorylated at the Nepsilon2 position and has a pKa of 7.3, which i…
When the rate of glucose addition to nongrowing Streptococcus bovis cell suspensions was increased, the fermentation was homolactic, fructose-1,6-diphosphate (FDP) increased, intracellular inorganic phosphate (P(i)) declined, and the energy-spilling rate increased. ATP and ADP were not significantly affected by glucos…
Silica supported methyltrioxorhenium complex of γ-(2,2′-dipyridyl)-aminopropyl polysiloxane (III) has been synthesized and demonstrated as a novel catalyst of high activity, stability and improved selectivity for epoxidation of alkenes with hydrogen peroxide at room temperature. The catalyst can be recycled at least f…
The crystallization process of the Ag or Cu doped Sb/sub 2/Te/sub 3/ amorphous film was investigated by isothermal treatment for one hour at 100/spl deg/C, 200/spl deg/C and 300/spl deg/C respectively. The crystallization temperatures of Ag/sub 8.3/Sb/sub 34.9/Te/sub 56.8/ and Cu/sub 8.4/Sb/sub 35.1/Te/sub 56.5/ films…
Soft x-ray magnetic circular dichroism (MCD) data were collected at the Co $L$ edges from a series of epitaxial $R\ensuremath{-}\mathrm{Co}$ ($R=\mathrm{P}\mathrm{r},\phantom{\rule{0ex}{0ex}}\mathrm{N}\mathrm{d},\phantom{\rule{0ex}{0ex}}\mathrm{S}\mathrm{m},\phantom{\rule{0ex}{0ex}}\mathrm{D}\mathrm{y},\phantom{\rule{…
Basic copper sulfates, , and cuprite, , are the major corrosion products found during field exposure of copper. The active species of the atmosphere which lead to formation of these corrosion products are, however, still uncertain. In this study, we investigated whether submicron acid ammonium sulfate particles, , can…
A behavioral model of magnetic materials is presented. This model takes into account both hysteresis and dynamic phenomena. It predicts B(H), /spl phi/(t) and d/spl phi/(t)/dt characteristics, and a few pieces of experimental data are needed to identify its parameters. In this paper, the authors propose to validate th…
Porphyrins with steric hindrance at the periphery are known to exhibit severely non-planar macrocycle conformations. Among other dodecasubstituted porphyrins, the title compound has been studied widely and shows a typical saddle-distorted macrocycle. The specific conformation of the porphyrin leads to the formation of…