Materials Literature
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Abstract Stereoirregular, isotactic , and syndiotactic poly(propylene) were decomposed by the gaschromatographic pyrolysis technique. Some components of the tetramer fraction were identified and resolved into the two possible diastereomers. The relative intensities of these vary according to the tacticity of the decom…
More recent CNDO calculations by Maggiora indicate that the atu orbital is at higher energy than the a2u in porphyrin as well as in the reduced porphyrins.This is different from our results, but does not affect explanations of the spectra because the order of the (al,, eg) and (azu eg) excited configurations is not ch…
Abstract The determination of the diffusion coefficient for water in various porosity cellulose acetate membranes by a gravimetric method, using a humidified carrier gas, is described. It was found to be impossible to obtain meaningful results for very porous membranes, although dense membranes gave limiting values of…
"Determination of sand Roughness for fixed beds." Journal of Hydraulic Research, 13(2), pp. 221–222
Abstract Durch Umsetzung von Tetrakis(trichlorsilyl)silan mit Methanol und Triäthylamin als HCl‐Akzeptor werden in Abhängigkeit von den Reaktionsbedingungen Tetrakis(trimethoxysilyl)silan ( I ) bzw. ein Gemisch von I , Tris(trimethoxysilyl)silan ( II ), Bis (trimethoxysilyl)‐silan ( III ) und Tetramethoxysilan erhalte…
The TRI Flammability Analyzer has been used to determine the effects of moisture on the flammability characteristics of textile materials. Both moisture in the fabric and in the test environment have been considered for a number of un treated and flame-retardant-treated fabrics. The results are reported and interprete…
ing a range of cluster sizes produced by the appropriate heat treatment are currently under way.I wish to thank A. Staudinger and D. M. Maher for the TEM results in
The protoplasts of a mutant of Bacillus subtilis 168 (B. subtilis CMK33) are osmotically fragile when compared to protoplasts of the parent organism and contain an active, membrane-associated phospholipase A1. A protein found in the parent organism specifically inhibits the phospholipase A1 (Kent, C., and Lennarz, W.J…
Abstract A second‐order transition of cellulose triacetate at approximately 30°C was studied by polarized infrared spectroscopy. The temperature dependences of infrared dichroismus were examined for the 900cm −1 (C 1 H bending vibration) and 600 cm −1 (acetyl group frequency) bands. The former changed at about 30°C,…
Article Measurement of Carbon Levels in Structurally Transformed SAE 52100 Ball Bearing Steel by Microprobe Analysis / Die Messung des Kohlenstoffgehaltes in einem umgewandelten Kugellagerstahl SAE 52100 mittels Mikrosondenanalyse was published on April 1, 1975 in the journal Practical Metallography (volume 12, issue…
William R. Cobb, Fine Structural Features of Destruction of Calcareous Substrata by the Burrowing Sponge Cliona celata, Transactions of the American Microscopical Society, Vol. 94, No. 2 (Apr., 1975), pp. 197-202
There is a growing interest in fundamental studies of surfaces, stimulated in part by the advent of new experimental techniques capable of characterizing the surface of a microscopic level, and in part by the relevance of research on surfaces to some very practical problems facing our technological society. These prob…
X-ray powder diffraction data have been developed or refined for the identification of drugs, excipients, and adulterants found in illicit preparations.
MnIn 2 Te 4 was prepared by direct synthesis from the elements at 800°C. The crystals are tetragonal, space group I 4̅ 2 m, with a = 6.191 Å, c = 12.382 Å, and Z = 2. The structure can be derived from the zincblende structure. It is related to the CdGa 2 S 4 and β-Cu 2 HgJ 4 type structures with the same ordered arran…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLinear trinuclear copper(II) complex with a spin-doublet ground stateW. A. Baker Jr. and Fred T. HelmCite this: J. Am. Chem. Soc. 1975, 97, 8, 2295–2296Publication Date (Print):April 1, 1975Publication History Published online1 May 2002Published inissue 1 April 1975https://p…
The lifetimes of gold films were measured at electrical current densities of (0.8−1.15) ×106 A/cm2 and temperatures of 220−500 °C. The effective activation energy was found to be 0.42 eV. Electromigration caused the formation of voids, hillocks, and whiskers. All films failed near the cathode, suggesting that gold ato…
The quasielastic scattering of laser light from nematic MBBA is studied utilizing homodyne procedures. The results stem from a comprehensive study of the half widths and areas of the "slow mode" peaks together with their temperature and angle dependence. The data taken at small angles yield the temperature-dependent r…
A calorimetric technique was used to accurately determine the dielectric loss tangent of both additive−free and commerical grades of polyethylene at liquid−helium temperature. We found that the loss tangent of polyethylene often exhibits a broadened dielectric relaxation peak. Although this peak is centered in the kil…
An ESR study of the [RhCl6]4− center in single crystals of AgCl has been made. The g values and chlorine hyperfine interactions observed for the axial chlorines are consistent with a d7 configuration and localization of the odd electron largely in the 4dz2 orbital. The same species has been studied in γ-irradiated sin…
Abstract Fourier transform infrared spectra have been obtained for polyethylene irradiated in oxygen and nitrogen atmospheres. The spectra before and after irradiation have been compared by digital subtraction. The difference spectra are indicative of changes caused by irradiation. Crosslinking and chain scission reac…