Materials Literature
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Polyvinyl alcohol (PVA)-utilizing cultures were obtained from various sources. They were mixed cultures even after cyclical transfer to liquid and plate media with PVA as a sole source of carbon. Component bacteria were isolated from the several mixed cultures, and it was shown that PVA was utilized symbiotically by t…
This book is one volume of the proceedings of the second conference on Environmental Degradation of Engineering Materials held at Virginia Polytechnic Institute on September 21-23, 1981. Papers in this volume describe hydrogen uptake and transport by metals, hydrogen adsorption and evolution from metals and hydrogen e…
Monitoring implies the measurement and control of the parameters of optical thin films during deposition with the object of ensuring the production of an acceptable coating. Monitoring techniques usually concentrate on film thickness as the most important parameter. The principal monitoring arrangements in current use…
The heat capacity of selenium from 0 K to 1000 K is reviewed using measurements on 20 samples reported in the literature. A set of recommended data for trigonal, monoclinic, glassy, and molten selenium is derived. Ring-chain equilibrium parameters are critically evaluated. Entropy, enthalpy, and Gibbs energy functions…
Calculation of piezoelectric constants e 31 and e 33 and pyroelectric constant p 3, of poly(vinylidene fluoride) electret is made on the basis of a model theory in which spheres with the spontaneous polarization Psc are embedded in a matrix. Results are in good agreement with observed values of these constants, respec…
Photoluminescent and electron spin resonance studies of MgO smoke powders show that etching of the smoke cubes by water vapour leads to an increase in the number of reactive sites of low coordination on the surface without a parallel increase in the surface area. The formation of anion radicals after adsorption of oxy…
The solid state properties of poly-β-hydroxybutyrate (PHB) were investigated for samples with degrees of polymerization [Formula: see text] from 4 to 994. The observed melting points ranged from 47 °C to 180 °C. Electron diffractograms on carefully prepared single crystals of a high molecular weight sample provided da…
The scattering of waves from periodic surfaces is studied. We give a general review of this problem and compare three analytical methods for a conducting sinusoidal surface in detail for both TE and TM polarized waves. The three methods are: 1) the method developed by Masel, Merrill, and Miller (MMM); 2) the Modified…
I. INTRODUCTION A. Background Soils and sediments are basic components of our environment, as they provide nurture for living matter and serve as "sinks" for deleterious species. The composition of these materials reflects the nature of the original base rock, the degree of degradation and leaching introduced by weath…
The vanishing of the 77Se nuclear resonance signal and the broadening by internal magnetic fields of the proton resonance line establish the existence of spin-density waves in the low temperature semiconducting state of (TMTSF) 2PF6. The thermally activated collective mode of the commensurate spin-density wave contrib…
The gene of an extreme thermophile, Thermus thermophilus HB8, which codes for a leucine biosynthetic enzyme, 3-isopropylmalate (3-IPM) dehydrogenase [EC 1.1.1.85], was cloned in Escherichia coli using pBR322 as a vector. E. coli cells carrying this recombinant plasmid, pHB2, produced the thermophilic enzyme 7-fold mor…
Structure determinations of the caesium alums CsMIII[SO4]2·12H2O, M = V, Cr, Mn, Fe, Co, Al, Ga, or In, have been carried out at 295(1) K by X-ray diffraction methods. The data obtained include (i) MIII–O distances for the metals in the [M(OH2)6]3+ species [V–O, 1.992(6); Cr–O, 1.959(3); Mn–O, 1.991(6); Fe–O, 1.995(4)…
Ionic and electronic conductivities, and thermoelectric power have been measured for AgI and AgI containing a dispersion of submicron size Al 2 O 3 particles. While the dispersion of Al 2 O 3 enhances the ionic conductivity significantly, it does not affect the electronic properties of the matrix. The enhancement is a…
Conference International Conference on Surface and Colloid Science, International Conference on Surface and Colloid Science, ICSCS, Surface and Colloid Science, Fourth, Jerusalem, Israel, 1981-07-05–1981-07-10 Published Online: 2009-01-01 Published in Print: 1981-01-01 © 2013 Walter de Gruyter GmbH, Berlin/Boston
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTranslational diffusion and hydrodynamic radius of unperturbed flexible chainsManfred Schmidt and Walther BurchardCite this: Macromolecules 1981, 14, 1, 210–211Publication Date (Print):January 1, 1981Publication History Published online1 May 2002Published inissue 1 January 1…
We discuss the time dependent correlation functions Sq( t) for one deuterated polymer chain, moving inside an entangled melt of chemically identical, protonated, chains. The region of interest corresponds to wave-vectors q such that D-1 >> q >> R0-1 where D is the tube diameter and R0 the overall chain size. In this r…
A series of materials containing nickel and aluminium ions has been prepared by coprecipitation with alkaline solutions, under various conditions, from solutions of the nitrates. The composition and structure of the precipitates has been examined using a number of techniques including chemical analysis, X-ray diffract…
To develop a laboratory test method for accelerating stress corrosion cracking (SCC) of steels in liquid ammonia, effects of ammonia contaminants, such as O2, N2, CO2, etc., and electro-chemical polarization on the time to failure of specimen under a constant tensile load have been studied.SCC is strongly accelerated…
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Abstract The advantages of performing coherent Raman spectroscopy with definite input and output polarizations are reviewed. Methods are described for evaluating Raman susceptibility tensor elements, depolarization ratios and nonresonant contributions to the third order nonlinear susceptibility. A systematic developme…