Dielectric properties of a model cationic ionomer
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High-field magnetization process and spin reorientation in (Nd1−xDyx)2Fe14B single crystals
The high-field magnetization process in the (${\mathrm{Nd}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Dy}}_{\mathit{x}}$${)}_{2}$${\mathrm{Fe}}_{14}$B system has been investigated using single crystals with x=0, 0.125, 0.2, 0.33, 0.47, 0.6, and 1. Magnetization measurements were performed using steady magnetic fi…
Polycarbonate‐polystyrene block copolymers and their application as compatibilzing agents in polymer blends
Abstract The synthesis of a block copolymer with polystyrene (PS) and polycarbonate (PC) segments is described. It is produced by anionic polymerization of the styrene and endcapping with a hydroxyl group followed by subsequent reaction with phosgene and bisphenol‐A. The polystyrene/polycarbonate block copolymer was u…
Precise determination of aluminum content in AlGaAs
The Al composition of AlGaAs has been determined by four methods: high-resolution transmission electron microscopy (HRTEM), reflection high-energy electron diffraction (RHEED), photoluminescence (PL), and double-crystal x-ray diffraction (DCXRD). HRTEM is direct and the most accurate method because it does not involve…
Dynamics and relaxation of large Barkhausen discontinuity in amorphous wires
Domain wall processes (domain wall configuration, propagation, and collapse) in magnetostrictive amorphous wires of the composition Fe/sub 77.5/Si/sub 7.5/B/sub 15/ were investigated. The wires were held under tensile stress (up to 1700 MPa in the case of as-quenched). The domain wall length and normal mobility (or da…
Large-Scale Extension and Recovery of Plain Woven Fabrics
This paper describes an attempt at a theoretical study of large-scale tensile defor mation of plain woven fabrics. The basis of the investigation is to use a more realistic approximation of nonlinear yarn bending behavior for both the undeformed fabric state and the stress analysis than has been used by most previous…
The effect of a lateral substituent on the mesomorphic properties of 4-cyanophenyl 4-(4-alkyloxybenzoyloxy)benzoates
The thermal properties of 4-cyanophenyl 4-(4-alkyloxybenzoyloxy)benzoates having a lateral substituent have been examined. Commencing with the nonyloxy homologue the hydrogen derivative shows a smectic A phase having a partially bilayered arrangement (SAAd). When the substituents are introduced at position X, the SAd…
Formation of Condensed Chlorides During Mixed Oxidation–Chlorination of Iron at 1000 K
The mixed oxidation-chlorination of iron in gas mixtures of Ar, O2, and Cl2 at 1000 K has been investigated by thermogravimetric analysis and examination of the corrosion products by optical and scanning electron microscopy and X-ray diffraction analysis. Vapor phase transport of iron chlorides influences the rate of…
The role of cysteine 206 in allosteric inhibition of Escherichia coli citrate synthase. Studies by chemical modification, site-directed mutagenesis, and 19F NMR.
Escherichia coli citrate synthase is strongly and specifically inhibited by NADH, but this inhibition can be prevented by reacting the enzyme with Ellman's reagent. We have now labeled the single reactive cysteine covalently with monobromobimane and isolated and sequenced the bimane-containing cyanogen bromide peptide…
An Impedance Study of a Carbon Fiber/Vinyl Ester Composite
The electrochemical behavior of a carbon fiber/vinyl ester composite in 3.5% NaCI solution was investigated. The technique chosen for the study was electrochemical impedance spectroscopy (EIS), which enables time-dependent data to be acquired nondestructively on single samples. The data from the measurement technique…
Internal stresses and elastic energy in ferroelectric and ferroelastic ceramics: Calculations by the dislocation method
A method is proposed for calculating the internal stresses in ferroelectric and ferroelastic ceramics which is based on the modelling of the mechanical sources of stress by fictitious dislocations continuously distributed on the grain and twin boundaries. For tetragonal and orthorhombic ceramics with a lamellar twin s…
Clearance of liposomal gadolinium: In vivo decomplexation
The contrast agents gadolinium-DTPA (diethylenetriaminepentaacetic acid), Gd-DOTA (tetraazacyclododecanetetraacetic acid), and Gd-HP-DO3A (1,4,7-tris[carboxymethyl]-10-[2' hydroxypropyl]-1,4,7,10-tetraazacyclododecane) are used in humans as extracellular contrast agents. Although free Gd+ ion is toxic, the intact Gd3+…
Isotope and impurity effects on the glass transition and crystallization of pressure-amorphized hexagonal and cubic ice
Amorphous solid D2O from hexagonal and cubic ices and H2O from (HF, NH3, and NH4F) doped hexagonal ice have been prepared by Whalley’s method, and their thermal behavior has been investigated by differential scanning calorimetry from 103 to 250 K. For a heating rate of 30 K min−1 , the temperature of the onset of the…
Luminescent nitridorhenium(V) complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescent nitridorhenium(V) complexesGregory A. Neyhart, Kevin J. Seward, James Boaz, and B. Patrick SullivanCite this: Inorg. Chem. 1991, 30, 24, 4486–4488Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1…
Phosphate Mineralogy and Equilibria in Two Kentucky Alfisols Derived from Ordovician Limestones
Abstract The phosphate mineral distribution as it relates to in situ soil solution composition of two Alfisols developed from phosphatic Ordovician limestones in the inner Bluegrass Region of Kentucky was investigated. At both sites, microcrystalline apatite appeared to be the primary source of P. Surface weathering u…
Effect of sequence distribution on miscibility in polymer blends
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of sequence distribution on miscibility in polymer blendsMary E. GalvinCite this: Macromolecules 1991, 24, 23, 6354–6356Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1991https://pubs.acs.org/doi/10.…
Study of Tails in Smectic Liquid Crystals. I. The Effect of Fluorocarbon/Hydrocarbon Ether Tails on Phenyl Ester Biphenyl Cores
The use of the mixed fluorocarbon/hydrocarbon ether sequence [1H,1H,5H-octafluoro-1-pentoxy-]ethoxy in place of aliphatic or aliphatic ether sequences significantly enhances the temperature range of the chiral smectic C (Sc*) liquid crystalline phase. Considerations derived from the literature, supported by computer m…
Surface cristobalite formation by mild hydrothermal treatment of silica gel and its effect on the deposition of tris(allyl)rhodium and subsequent reactivity of (silica)rhodium(allyl)2
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface cristobalite formation by mild hydrothermal treatment of silica gel and its effect on the deposition of tris(allyl)rhodium and subsequent reactivity of (silica)rhodium(allyl)2H. Eric Fischer, Steven A. King, John B. Miller, Jackie Y. Ying, Jay B. Benziger, and Jeffre…
Single-ion competing magnetic anisotropies inPrxNd1−xCo5intermetallic compounds
Competing single-ion 4f magnetic anisotropies have been studied within a noncollinear three-sublattice mean-field crystal-electric-field model in order to explain the observed complex magnetic behavior in the pseudobinary series ${\mathrm{Pr}}_{\mathit{x}}$${\mathrm{Nd}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{…
Phases and phase transitions in a nematic lyotropic system with a biaxial phase
NMR spectroscopy and optical microscopy have been used to study phase transitions and structure in nematic lyotropic mesophases formed by potassium laurate, decylammonium hydrochloride and water. The different mesophases obtained in a well-defined composition range have been characterized, by deuterium NMR, following…