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Experimental methods are presented for observing local fabric deformation during uniaxial tensile loading of a woven fabric. These experiments include the traditional ravel strip test as well as the use of video taping, encapsulation, and photographing fabrics varying in weave texture, yarn type (ring and rotor spun),…
The influence of Nb‐doping from 1.0 to 8.0 at.% on grain size, ferroelectric phase transition, lattice strain, and electrical properties of BaTiO 3 Cerumics has been studied. A change in the Nb‐doping effect was observed at compositions around 3.5–4.5 at.% Nb. The impedance behavior revealed that specimens of low Nb‐d…
The unusual electrical properties of metallophthalocyanines (M(Pc)S) have made them the centerof much interest recently, in particular as candidates for the fabrication of novel molecularelectronic devices.M(Pc)‐basedrectifiers have been known for 20 years, but now a new non‐Schottky‐type of rectification has been dis…
Abstract Pyrazoles were found as a novel class of blocking groups for isocyanates. Adhesive mixtures of pyrazole blocked isocyanates and amine terminated prepolymers like Jeffamines® (Texaco Chem. Co.) combine excellent reactivities (gelation times within minutes at 100–120°C), good latencies (more than 170 days at 40…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation A. H. Eng, S. Kawahara, Y. Tanaka; Trans-Isofrene Units in Natural Rubber. Rubber Chemistry and Technology…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxometalate Diphosphate Complexes. Folded Macrocyclic Dodecatungstates, [(O3PXPO3)4W12O36]16- (X = O, CH2)Uli Kortz, Geoffrey B. Jameson, and Michael T. PopeCite this: J. Am. Chem. Soc. 1994, 116, 6, 2659–2660Publication Date (Print):March 1, 1994Publication History Publ…
Aluminum oxide (Al2O3) films are used in a variety of applications including optics and microelectronics. We have deposited aluminum oxide films on 5 in.2 polished fused quartz substrates by the rf sputtering method. It was found that properties of these films such as refractive index and density varied significantly…
Abstract PdAs 2 , PdSb 2 , PtSb 2 and PtBi 2 have been formed from reactions of 1‐gram samples of the elements in quartz tubes at 923 K, and their crystal structures have been reinvestigated. These materials crystallize with the pyrite structure. The lattice constant, a , and the positional parameter, x, of the nonmet…
Barium gallogermanate glasses were prepared with substitutions of Al 2 O 3 , Y 2 O 3 , La 2 O 3 , and Gd 2 O 3 for Ga 2 O 3 . The effects of these substitutions on the glass transformation temperature, viscosity, thermal expansion, and molar volume have been determined. The changes in properties associated with each s…
A theoretical model is demonstrated that provides a reliable prediction of thermal transmission through nonwoven structures. The validity of the model is confirmed in experiments that measure the thermal conductivity of various nonwoven barrier fabrics. The model is used to characterize the relative contribution of he…
We present a second virial theory of the isotropic-to-nematic phase transition in solutions of (polydisperse) wormlike micelles interacting via a hard-core excluded volume. Analytical expressions are derived for the osmotic pressures and the chemical potentials of the surfactant molecules in the coexisting phases. In…
Size effects in two-phase Boolean magnets composed of an aligned hard phase and a soft phase with high magnetization are investigated. In 'overcritical' magnets, where the size of the soft regions is larger than the Blochwall width /spl delta//sub h/ of the hard phase, the energy product is reduced compared to the cor…
Earlier covalent modification experiments indicated that histidine, arginine, and carboxylic acid residues were involved in the catalytic mechanism of the acid phosphatase enzyme from human prostate. The present study utilizes site-directed mutagenesis to evaluate the catalytic importance of 7 residues of human prosta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChiral Poly(dipentylsilylene) CopolymersHolger Frey, Martin Moeller, and Krzysztof MatyjaszewskiCite this: Macromolecules 1994, 27, 7, 1814–1818Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994https://pubs.acs.…
The high-potential iron-sulfur protein (iso-form II) isolated from Ectothiorhodospira vacuolata has been crystallized and its three-dimensional structure determined by molecular replacement procedures and refined to 1.8-A resolution with a crystallographic R factor of 16.3%. Crystals employed in the investigation belo…
Abstract Samples of natural clinoptilolite modified by treatment with NH 4 Cl or HCl solutions, followed by thermal treatments, have been characterized, and their catalytic activity evaluated, in o-xylene isomerization and ethanol dehydration reactions. The substitution of the compensating cations by NH4+ does not pro…
Abstract Solutions of the stationary and time‐dependent equations of diffusion are presented for contamination when scanning a rectangular area in the scanning electron microscope (SEM). A method is described to record the thickness of the contamination layer by the signal of secondary or backscattered electrons and t…
The mono- and trisubstituted peroxyniobium polyoxotungstates of formulas [(CH3)3NH]7[Si-(NbO2)3W9O37], Cs7[Si(NbO2)3W9O37], alpha-K5[Si(NbO2)W11O39] and alpha-[(CH3)3NH]5[Si(NbO2)-W11O39], have been prepared, purified, and characterized spectroscopically by 29Si NMR, 183W NMR, and IR. The presence of peroxo groups was…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Characterization of Poly(carborane-siloxane-acetylene)Leslie J. Henderson and Teddy M. KellerCite this: Macromolecules 1994, 27, 6, 1660–1661Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994https:…
Polymer‐protected bimetallic clusters areexcellent candidates as catalysts for various chemical reactions. For Example, Cu/Pd clusters accelerate the hydration of acrylonitrile (See Figure). However, hurdles femain to be overcome in their preparation. Following a brief overview of preparative techniques, details are g…