Materials Literature
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Lithium or sodium doped beryllium oxide, BeO(Li: 0.5 mol%) and BeO(Na: 0.5 mol%), were found to be efficient and reliable thermoluminescent phosphors. Glow curves of both BeO(Li) and BeO(Na) have simple peaks at 180°C. The thermoluminescent spectrum shows a broad band in the ultra-violet region peaking at 330 mmicro w…
Abstract The behavior of trapped radicals in polyethylene which is irradiated in air at room temperature, under grafting of methylmechacrylate or butadiene has been studied by electron spin resonance. Part of the alkyl radicals are converted to allyl radicals by reaction with double bonds and the others disappear by r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of low-spin cobalt porphyrins. V. Molecular stereochemistry of nitro-.alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinato(3,5-lutidine)cobalt(III)James A. Kaduk and W. Robert. ScheidtCite this: Inorg. Chem. 1974, 13, 8, 1875–1880Publication Date (Print):Augus…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of tris(tropolonato)manganese(III), Mn(O2C7H5)3, a high-spin complex having structural features consistent with Jahn-Teller behavior for two distinct MnO6 centersA. Avdeef, J. A. Costamagna, and J. P. FacklerCite this: Inorg. Chem. 1974, 13, 8…
A series expansion for the dielectric constant of the Bernal-Fowler-Pauling model of ice relaxed to allow Bjerrum faults is developed using a renormalization technique which eliminates large numbers of subgraphs. In the no fault limit the dielectric constant has the form ε0 = ε∞ + (4πG/3)(N/V)(μ2/kT) where the Bethe t…
A simplified form of Slater's model for treating exchange effects in an itinerant antiferromagnet is applied to hexagonal NiS. In this calculation, which involves the augmented-plane-wave (APW) method, the antiferromagnetic superlattice is introduced by adding a constant $+{V}_{s}$ and $\ensuremath{-}{V}_{s}$ to the p…
Abstract CDP-diglyceride: l-serine phosphatidyltransferase (phosphatidylserine synthetase) of Escherichia coli is tightly associated with ribosomes in crude cell-free extracts. The synthetase has now been separated from ribosomes by extraction with solutions containing 5 m NaCl and has been purified 100-fold. The part…
The effect of straight‐chain alcohols having chain lengths of 6 to 12 carbon atoms on crack propagation in glasses was studied. The test was a modification of the double‐cantilever‐beam technique. Plots of crack velocity vs stress intensity factor, K , were trimodal, similar to those for glass tested in N 2 gas of var…
Abstract A study of the oxidation of poly(vinyl alcohol) (PVAL) by potassium persulfate (KPS) in aqueous solutions showed that the decomposition of KPS was greatly enhanced by the presence of PVAL, its hydroxyl groups being oxidized to ketones in a yield of about one mole of ketone from one mole of KPS. The decomposit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImproved synthesis of tetrathiafulvaleneL. Russell Melby, Harris D. Hartzler, and William A. SheppardCite this: J. Org. Chem. 1974, 39, 16, 2456–2458Publication Date (Print):August 1, 1974Publication History Published online1 May 2002Published inissue 1 August 1974https://pu…
A scaled particle theory is developed for a fluid of hard spherocylindrical rods with fixed orientations. Unlike earlier scaled particle treatments of this system, it maintains thermo-dynamic consistency in that the Maxwell relation $\frac{{\ensuremath{\partial}\ensuremath{\mu}}_{i}}{{\ensuremath{\partial}\ensuremath{…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
131 I‐ or 125 I‐labelled albumin and β‐fructofuranosidase were entrapped in liposomes composed of phosphatidylcholine, cholesterol and a charged lipid (molar ratio 7:2:1). Investigations on the fate of such liposomes injected into rats revealed the following. 1. Initially there is an increased rate of removal from pla…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and purification of 18-crown-6[1,4,7,10,13,16-hexaoxacyclooctadecane]George W. Gokel, Donald J. Cram, Charles L. Liotta, Henry P. Harris, and Fred L. CookCite this: J. Org. Chem. 1974, 39, 16, 2445–2446Publication Date (Print):August 1, 1974Publication History Pu…
The results of neutron time of flight spectroscopy measurements for the separated Cd isotopes (110, 112, 114, 116) and for natural Cd, using the Nevis synchrocyclotron, are given. Transmission and self-indication measurements were made for a range of sample thicknesses for natural Cd, and for each of the above even A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, phase equilibriums, crystal chemistry, and some properties of lanthanide hydroxide nitratesJohn M. HaschkeCite this: Inorg. Chem. 1974, 13, 8, 1812–1818Publication Date (Print):August 1, 1974Publication History Published online1 May 2002Published inissue 1 Augus…
Changes of ultrasonic transit times in compression-annealed pyrolytic graphite (CAPG) were measured as a function of temperature (4–300°K at atmospheric pressure) and of pressure (0–20 kbar at 295°K). From the low-temperature results, obtained for five independent acoustic modes, the temperature variations of all five…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of tris(2,4-pentanedionato)manganese(III), Mn(O2C5H7)3, a distorted complex as predicted by Jahn-Teller argumentsJ. P. Fackler and A. AvdeefCite this: Inorg. Chem. 1974, 13, 8, 1864–1875Publication Date (Print):August 1, 1974Publication Histor…
The radiation-induced defect centers in a low-loss Corning germanium-doped optical fiber have been studied. In addition to silicon E′ centers, four germanium-related centers, corresponding to electrons trapped at the site of oxygen vacancies in s p3 orbitals of germanium ions with zero to three next-nearest-neighbor g…
A strain aging type of reversible hydrogen embrittlement has been demonstrated for a high strength aluminum alloy in a 3% NaCl environment. Permeation of hydrogen was related to SCC under cathodic polarization as well as anodic conditions. Internal friction and lattice parameter measurements relate directly to lattice…