Materials Literature
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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…
Particles of BaFe 12 O 12 were prepared by chemical coprecipitation; their magnetic properties were studied. A coercive force of 6000 Oe, one of the highest reported for isotropic BaFe 12 O 19 , was obtained. X‐ray and Moessbauer studies were conducted to examine the mechanism of formation. Superparamagnetic α‐Fe 2 O…
A “periplasmic” maltose binding protein was purified from Escherichia coli. This protein is shown to be under the same positive control as the whole maltose system, and its synthesis is inducible by maltose. This binding protein is coded by malE , one of the three cistrons of the malB region involved in the transport…
The reversible magnetization curve M(H) of a polycrystalline ferromagnet has been investigated with the objective of examining the properties of the singularities located at H = −HA, the anisotropy field, along the hard direction. Using a simple model that approximates the system as a continuous assembly of noninterac…
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
A discussion is given of metal-insulator transitions in VO2, Ti2O3 and also in Ti2-x V x O3, which at low temperatures becomes metallic with increasing x. Although these are band-crossing transitions, there being no magnetic moments on the metallic ions, a large discontinuity is expected in the number of current-carri…
Geometric theory of the grating is developed, with special emphasis on the relation between the properties of holographic gratings and those of mechanically ruled gratings. The theory is applicable to practically all types of holographic and mechanically ruled gratings, including aspheric gratings. General expressions…
The fracture of 6 glasses was studied in vacuum, <10 −4 torr (10 −2 N/m 2 ), as a function of temperature from 25° to 775°C. Subcritical crack growth was observed in 4 of the glasses. Activation energies for crack motion ranged from 60 to 176 kcal/mol. The glasses which did not exhibit slow crack growth were “anoma…