Materials Literature
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This paper presents a chemical and physical analysis of the surface of polypyrrole- coated electrically conductive textiles and a study of the adhesion of polypyrrole- coated nylon fibers to epoxy using the microbond test. The chemical composition of the surface of the conductive polymer coating was determined using x…
In an offset printing factory with 56 workers, 20 (36%) developed symptomatic peripheral neuropathy due to exposure to n-hexane. Another 26 workers (46%) were found to have subclinical neuropathy. The initial change in the nerve conduction study was reduced amplitude of the sensory action potentials, followed by reduc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlycoconjugated porphyrins. 2. Synthesis of sterically constrained polyglycosylated compounds derived from tetraphenylporphyrinsPhilippe Maillard, Jean Luc Guerquin-Kern, Christiane Huel, and Michel MomenteauCite this: J. Org. Chem. 1993, 58, 10, 2774–2780Publication Date (P…
The transient transport of momentum, energy, and species during solidification of a Pb-19 percent Sn alloy is numerically simulated with and without magnetic damping. The system is contained in an axisymmetric, annular mold, which is cooled along its outer vertical wall. Since thermosolutal convection accompanies soli…
The tensile creep and creep‐recovery behavior of a unidirectional SiC‐fiber/Si 3 N 4 ‐matrix composite was investigated at 1200°C in air. A primary objective of the study was to determine how various sustained and cyclic creep loading histories would influence the creep rate, accumulated creep strain, and the amount o…
The nucleotide sequence of a 7-kilobase segment of the Bacillus subtilis chromosome containing the entire coding regions for the enzymes catalyzing the first three steps of diaminopimelate synthesis as well as dipicolinate synthase has been determined. This group of functionally related genes, termed the dap operon, w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoregulation of enzyme activity. Photochromic, transition-state-analog inhibitors of cysteine and serine proteasesPamela R. Westmark, John P. Kelly, and Bradley D. SmithCite this: J. Am. Chem. Soc. 1993, 115, 9, 3416–3419Publication Date (Print):May 1, 1993Publication His…
The structure and dynamics of the lanthanide(II1) complexes of the bis(propy1amide) of diethylenetriaminepentaacetate \n(DTPA-PA3 in aqueous solution have been investigated by I3C and I7O NMR. With the use of the longitudinal \n13C relaxation times of the NdlI1 complex it is shown that the organic ligand is bo…
Tape casting and hot‐pressing were used to produce metal/ alumina laminate composites. The mechanical behavior of these laminates was characterized. The strength and toughness of the laminates were greatly improved in comparison to that of monolithic alumina. Indentation strength values of the laminates remained appro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic properties of isostructural dodecanuclear polyoxovanadates with six and eight vanadium(IV) ionsDante Gatteschi, Boris Tsukerblatt, Anne Laure Barra, Louis Claude Brunel, Achim Mueller, and Joachim DoeringCite this: Inorg. Chem. 1993, 32, 10, 2114–2117Publication Dat…
Abstract In this contribution, the X‐ray diffraction (XRD) pattern of a highly oriented sample of syndiotactic polystyrene in the mesomorphic form, collected by an automatic diffractometer, is presented, thus providing quantitative and more complete information relative to the diffracted intensity. The structural chan…
TiCl3-induced coupling of meso-forrnylporphyrins provides cofacial porphyrin dimers such as 1 (M Cu, Ni) with bridging cis-CHCH units. These compounds show strong interactions between the porphyrin rings; in the case of M Ni, the dimer can be easily transformed into the corresponding trans isomer. Similar reactio…
The effects of both polymer hydrophobicity and addition of stabilizers on the release and integrity of polymer-encapsulated proteins were studied. By using very hydrophobic poly[1,3-bis(p-carboxyhydroxy)hexane anhydride] with sucrose as an excipient, both recombinant bovine somatotropin and zinc insulin were released…
Lead magnesium niobate (Pb(Mg 1/3 Nb 2/3 )O 3 , PMN) was prepared by a molten salt synthesis method. Powder characteristics were greatly influenced by the processing parameters, such as amount of salt, species of salt, and the presence of excess PbO. Grown in sulfate salts, PMN crystallites showed faceted morphology w…
A dense and isotropic Si 3 N 4 composite body containing 25 vol% of α‐SiC platelets, with average particle size of 24μm and aspect ratio of 8 to 10, was fabricated by hot isostatic pressing without any addition of sintering aids. In this composite, desirable properties for structural ceramics to be used in long‐term h…
Abstract Dendrimers with bulky repeating units containing up to 43 benzene rings (in 9 ) have been obtained by using a repetitive divergent synthetic strategy (three generations). The new functional dendrimer 13 containing six azobenzene units at the periphery was synthesized allowing a reversible switching of the sha…
Frequency dependent representations of eddy currents in laminated cores of power transformers are developed. One representation is based on a continued fraction expansion for the frequency dependent magnetizing impedance while the other is based on a discretization of flux distribution within the lamination. Both mode…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnantioselective epoxidation of unfunctionalized olefins catalyzed by threitol-strapped manganese porphyrinsJames P. Collman, Virgil J. Lee, Xumu Zhang, James A. Ibers, and John I. BraumanCite this: J. Am. Chem. Soc. 1993, 115, 9, 3834–3835Publication Date (Print):May 1, 199…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and processing of heterocyclic polymers as electronic, optoelectronic, and nonlinear optical materials. 3. New conjugated polyquinolines with electron-donor or -acceptor side groupsAshwini K. Agrawal and Samson A. JenekheCite this: Chem. Mater. 1993, 5, 5, 633–640P…
Abstract Gypsum (CaSO 4 ·2H 2 O) is used in agriculture both as a source of calcium (Ca 2+ ) and sulfate (SO 2− 4 ) and as an amendment to improve soil structure. We examined the effect of Ca 2+ on the adsorption of SO 2− 4 in variable‐charge soils. Sulfate adsorption measurements from batch and column experiments sho…