Materials Literature
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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…
It appears pertinent for the opening of this review to cite the work of Ipatiew [1]. In 1901 he reported that certain metals catalyzed the decomposition of alcohols even above the melting points of the catalyst metals, However, he gave no special attention to the catalytic activity of the molten metal (liquid metal),…
The electrical conductivity and thermoelectric power of the superionic conductor Ag 3 SBr were measured in the temperature range from 293 K to 493 K. Considerable deviations from the Arrhenius law was observed in the results of the ionic conductivity. The temperature dependence of the thermoelectric power of this syst…
57 Fe and 19 Sn Mossbauer investigations of the antiferromagnetic compound FeSn are reported from 77K to well above its magnetic transition temperature. The observation of a single nuclear Zeeman pattern from 1(a) Sn sites implies that the spin ordering in the basal plane is collinear. The 57 Fe Mossbauer studies show…
A pattern of driven vortices can be observed in the shear layer created in a fluid by a rotation movement. We present such an experiment where a liquid membrane is used to close a thin experimental volume of air thus forming a wall with the following properties : — The parallel component of the fluid velocity does not…
Abstract The dependence of the first order Raman scattering efficiency of CaF 2 , SrF 2 , BaF 2 and diamond on photon energy ω L has been measured with different techniques. We find that in the visible these cross‐sections increase with ω L much faster than ω . This result has important implications as CaF 2 , for ins…