Materials Literature
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Abstract Anodic overoxidation of polypyrrole in the presence of nucleophiles such as H 2 O, OH − , CH 3 OH, CH 3 O − , Br − and CN − has been studied in detail. At potentials up to 2.1 V (vs. SCE), irreversible anodic peaks are observed with 200 nm layers on Pt. In most of the cases, a total of z = 4 – 6 F /mol monome…
The phase diagram of a system of hard parallel spherocylinders with length-to-width ratios L/D between 0 and \ensuremath{\infty} is investigated by Monte Carlo simulation. In addition to a low-density nematic phase and a high-density crystalline phase, two phases with partial translational order are observed, viz., a…
Sixteen characterized alcohol dehydrogenases and one sorbitol dehydrogenase have been aligned. The proteins represent two formally different enzyme activities (EC 1.1.1.1 and EC 1.1.1.14), three different types of molecule (dimeric alcohol dehydrogenase, tetrameric alcohol dehydrogenase, tetrameric sorbitol dehydrogen…
The three-dimensional structure of a genetically engineered variant of porcine growth hormone, methionyl porcine somatotropin (MPS), has been determined at 2.8-A resolution, using single crystal x-ray diffraction techniques. Phases were obtained by use of a single isomorphous K2OsCl6 derivative and were improved by us…
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In manufactured cements, and concerning the quality control, the fast determination of the contents of free lime is a necessary step. The measurement of the content is made taking the net altitude of one peak of the DRX which, on each case, is peculiar to the compound to be determined. So, a calibrating curve is drawn…
The concrete resistivity has been considered as a factor which affects the corrosion rate of the rebars. Untill now the only relation found has been stablished between potentials and resistivity for steel embedded in Chloride contaminated concrete. In this paper a comparison between corrosion rate of rebars, determine…
The authors present an investigation of the atomic structure of the metallic glass Ca 60 Al 40 by energy-dispersive X-ray diffraction and computer simulation studies based on pseudopotential-derived interatomic forces. The characteristic features of the structure of Ca 60 Al 40 are the large contraction of the Ca-Ca n…
This work confirms the certainty of the predictions of useful service given by Kaluosek and al. for the sulphate resistant portland cements (type V, USA), subject to severe selenitic attack. Two sulphate resistant portland cements, were tested by means of the Le Chatelier Anstett method. The tarts were destroyed at ag…
The purposes of this study were to assess the effect of two quantities (1 mL or 3 mL) of four different handwashing products on reductions in log colony-forming units (CFU) from the hands and to determine the amount of liquid soap used for handwashing by personnel in one hospital. First, 40 subjects were assigned by b…
Abstract A new thermal conduction model is proposed for a polymer system filled with a mixture of several types of particles. Predicted values by the new model are compared with experimental data. The model is derived by extending a model that was previously proposed for a two‐phase system. The following equation is d…
The conductivity of porous cermets at 1000°C was determined as a function of Ni content between 15 and 50 volume percent (v/o) of total solids for two different zirconia particle sizes (23 and 47 m 2 /g). Below Ni contents of 30 v/o, ionic conduction through the zirconia phase dominated. At 30 v/o Ni, a greater than t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn measuring the distribution of local free volume in glassy polymers by photochromic and fluorescence techniquesJohn G. Victor and John M. TorkelsonCite this: Macromolecules 1987, 20, 9, 2241–2250Publication Date (Print):September 1, 1987Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and physical properties of trinuclear oxo-centered manganese complexes of general formulation [Mn3O(O2CR)6L3]0,+ (R = methyl or phenyl; L = a neutral donor group) and the crystal structures of [Mn3O(O2CMe)6(pyr)3](pyr) and [Mn3O(O2CPh)6(pyr)2(H2O)].cntdot.0.5MeCN…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic analysis of phase separation behavior of model polyurethanesHan Sup Lee, Ying Kang Wang, and Shaw Ling HsuCite this: Macromolecules 1987, 20, 9, 2089–2095Publication Date (Print):September 1, 1987Publication History Published online1 May 2002Published inissue 1…
Abstract The application of corresponding state principles to describe the properties of polymers is implicit in many of the fundamental studies of polymeric behavior. The seminal works of Prigogine, Hildebrand, Eyring, Flory, Gibbs, and DiMarzio in which multidimensional lattice representations and refined statistica…
(NOTE: Each chapter concludes with Summary, References, and Problems.) Preface. 1. An Overview of Microelectronic Fabrication. A Historical Perspective. An Overview of Monolithic Fabrication Processes and Structures. Metal-Oxide-Semiconductor (MOS) Processes. Basic Bipolar Processing. Safety. 2. Lithography. The Photo…