Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of hydrogen bonds to control molecular aggregation. Association of dipyridones joined by flexible spacersMichel Gallant, Phan Viet Minh Tan, and James D. WuestCite this: J. Org. Chem. 1991, 56, 7, 2284–2286Publication Date (Print):March 1, 1991Publication History Publish…
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The local structure around Bi atoms has been studied in ${\mathrm{Ba}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{K}}_{\mathit{x}}$${\mathrm{BiO}}_{3}$ (0.0x0.4) via x-ray-absorption spectroscopy. The structure is determined in terms of coordination numbers and interatomic distances around the Bi atoms between 300…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrolysis chemistry of an organometallic precursor to silicon carbideWayde R. Schmidt, Leonard V. Interrante, Robert H. Doremus, Todd K. Trout, Paul S. Marchetti, and Gary E. MacielCite this: Chem. Mater. 1991, 3, 2, 257–267Publication Date (Print):March 1, 1991Publication H…
Preceramic polymers offer exceptional potential for low‐temperature processing of both oxide and non‐oxide ceramics. In addition, shapes such as fibers, films, and membranes that are not commonly available using standard processing techniques are readity available using preceramic polymers. In non‐oxide ceramics, the…
Abstract The microstructure development during capillary flow of polyblends containing Liquid Crystalline Polymers (LCPs) was studied. In the present investigation the wholly aromatic LCP constituent was the minor phase suspended in polycarbonate (PC), poly(butyleneterephthalate) (PBT) or Nylon 6 (N‐6), in addition to…
The primary sequence of the receptor for L-arabinose or Ara-binding protein (ABP) composed of 306 residues is very different from the D-glucose/D-galactose-binding protein (GGBP) which consists of 309 residues. Nevertheless, superimpositioning of the well-refined high resolution structures of ABP in complex with D-gal…
Crystal/material quality and electrical properties of B-doped diamond films synthesized by microwave plasma chemical vapor deposition were investigated. Raman spectroscopy verified the presence of diamond and indicated that the crystal quality increased with B doping. Secondary-ion mass spectroscopy showed that the B/…
The distinguishing fe atures of different air texturing jets have been described and the te st methods use d to assess some impo rtant properties of air textured ya rn s have been discussed. The properties of air textured yarns produced using various currentl y used commercial jets have been compared. The re sults sho…
Abstract In this paper photocurrents of N ‐isopropylcarbazole (NIPC) derivatives in polycarbonate hosts are reported and compared to data for a benzotriazole derivative (BTA). The carbazole moiety was substituted with both electron donor and acceptor substituents and the photoconductivity was measured as a function of…
Outgassing rates were measured and compared for 304L, 316L, and 316LN stainless steels in fully degassed condition produced by repeated pumpdown and baking. In addition, thermal desorption characteristics and surface composition were measured. In particular, the effect of grade, vacuum remelting, and prebaking is disc…
The reaction of NH 4 TcO 4 with PPh 3 in DMF solution in the presence of HCl produces mer-Tc iii (PPh 3 ) 2 Cl 3 (DMF)•2PPh 3 (1). When the reaction is done in acidic DMA, the yellow product isolated was identified as NH 2 (CH 3 ) 2 + DMAH + [TcCl 6 ] 2− •PPh 3 O (2). The dimethylammonium cation was produced from the…
Lattice strains have been measured by neutron diffraction from the alumina matrix in alumina–mullite composite cylinders. Infiltration processing results in a macroscopic variation of mullite concentration and residual stress throughout the samples. At the midheight of the cylinder, the stress component parallel to th…
Model reactions of the hardening of gelatin with 13 C labeled formaldehyde were monitored by 13 C NMR spectroscopy in solution and in the solid state. In solution primary attack of formaldehyde first forms methylols of lysine residues and later of arginine residues, which react to a lysine-arginine crosslink. During t…
In June 1988 Gd DTPA became the first MR contrast agent to be approved for clinical use in adult patients in the United States. Initial approval was given for its use in imaging of the head. One year later approval was extended to include spine studies. This was soon followed by approval for use in children aged 2 yea…
The electro‐oxidation reactions of substituted polysilane homopolymers dissolved in methylene chloride electrolyte were studied using cyclic voltammetry and chronocoulometry. The oxidation waves appear at potentials close to those for the corresponding waves for polymer films, but the current peak height responds line…
Abstract The inelastic reflection of fast electrons is investigated on the base of the “invariant imbedding method”. The non‐linear term in the integral equation can be neglected owing to the strong anisotropy of elastic cross‐section of fast electrons. Using the Fokker‐Planck approximation and the Laplace transformat…
Quantitative determination of phase abundance in high‐alumina refractories has been performed using the Rietveld refinement method applied to X‐ray powder diffraction data. The use of a “whole‐pattern” method for analysis has allowed the simultaneous determination of accurate unitcell parameters and the phase abundanc…
Abstract Sixty percent of the supratidal deposits of a well in the giant Yacheng Gas Field show evidence of pedogenic alteration. Pedogenic features of these Mid-Tertiary sediments include porphyroskelic and lattisepic textures, argillans, embayed quartz grains, peds, horizonation, high carbonaceous content, pedotubul…
Total serum calcium concentration was raised in a 63-year-old lady with multiple myeloma and markedly elevated serum IgA kappa-paraprotein concentration. Symptoms of hypercalcaemia were absent, and serum ionized calcium was normal, suggesting calcium binding by the abnormal protein. This was demonstrated directly afte…