Materials Literature
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The theory of KH2PO4 developed by Yomosa and the present writer can be applied to the upper phase of NH4H2PO4 without any alteration. All the experimental data can be represented by the formulas of this theory. It is shown that this theory has a more general character than it appears as based upon Slater's model of KH…
The investigation is divided into two parts: the first is concerned primarily with stability relations among the various crystalline phases of $$MgSiO_{3}$$. Contrary to results given in previous published investigations, experimental evidence favors the stability of rhombic enstatite and protoenstatite. Clinoenstatit…
A review of surface active and ionic type corrosion inhibitors, methods of neutralization and buffering, removal of corrosive agents, self-repairing coatings and bactericides are discussed. Anodic and cathodic agents are considered at length and the various factors incident to the use of these types of inhibitors desc…
Abstract Vulcanization with sulfur is ascribed to the formation of sulfur radicals which are believed to copolymerize with the rubber molecule double bonds. Hydrogen sulfide is proposed as necessary for chain initiation but when formed in sufficient amounts serves as a chain terminator. This is believed to lead to num…
The historical relationship between the science and the technique of textile finishing is illustrated herein by a description of the principles of indigo dyeing. This ingenious technique was developed thousands of years ago, but it has been understood only recently. The rapid progress of polymer and colloid science ha…
It is concluded from electron metallographic results that the high coercive force and anisotropy of Alnico 5 are caused by a very finely divided precipitate produced by the permanent magnet heat treatment. This precipitate is a transition structure rich in cobalt and is face-centered cubic with a0 = 10A and appears as…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
Osmium tetroxide fixation of tissue blocks, as usually effected, is preceded by an acidification of the tissue. This acidification is probably responsible for morphological alterations which are notably disturbing in electron microscopy. The acidification and the resulting morphological alterations cannot be prevented…
Lattice parameter determinations of 99.97 percent pure silicon (containing 0.03 percent carbon) were carried out using the asymmetric method, a 64-mm precision camera in a thermostat at constant temperatures (10, 20, 30, 40, and 50°C). The powder mounts, about 0.12-mm in diameter, were translated and rotated during th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of Water Vapor by Montmorillonite. II. Effect of Exchangeable Ions and Lattice Swelling as Measured by X-Ray DiffractionR. W. Mooney, A. G. Keenan, and L. A. WoodCite this: J. Am. Chem. Soc. 1952, 74, 6, 1371–1374Publication Date (Print):March 1, 1952Publication H…
The intrinsic magnetization of alloys among the iron transition group of metals has been explained using a Heitler-London model for the $3d$ electrons. The magnetic moment associated with each atom is determined by the principle of maximum spin and the sign of the interaction between neighboring pairs from the overlap…
The analysis of results obtained from studies of electric resistivity as a function of temperature, and sample preparation, and of other available evidence, leads to a clarification of the electronic processes in the class of substances extending from condensed ring molecular solids to polycrystalline graphite. In all…
A general theory of phase transformation by means of static pulsating-flux transformers is presented, i.e. m to n phases on a k-limbed transformer, m, n, and k being integers greater than unity. This is derived from the requirements of e.m.f. and m.m.f. balance. Except in the so-called 2-phase case, freedom of choice…
Foams have the power of sucking oil into the junctions between the liquid films or lamellae which separate air bubbles, probably because the cury ature of the water‐air surface is greatest, and the pressure in the liquid lowest, at these junctions. When a foam carrying lines of oil along these junctions breaks, the oi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSOLUBILITIES OF SATURATED FATTY ACID ESTERSR. S. SEDGWICK, C. W. HOERR, and H. J. HARWOODCite this: J. Org. Chem. 1952, 17, 2, 327–337Publication Date (Print):February 1, 1952Publication History Published online1 May 2002Published inissue 1 February 1952https://pubs.acs.org/doi/…
A series of glasses in the system Na 2 O–SiO 2 –TiO 2 were melted. Density measurements and refractive indices were determined. Molar refractions of the various glasses were calculated using the Lorentz‐Lorenz relationship. The partial molar refraction of TiO 2 , as determined in glass, corresponds closely with the va…
1. Both fresh water and marine molluscs take up labeled calcium and phosphorus from the water. 2. Labeled calcium is concentrated on the periphery of the mantle and also is incorporated into the crystals of calcium carbonate in the newly formed shell. 3. Labeled phosphate was localized on the inner margin of the mantl…
Research Article| February 01 1952 A search for specific chemical methods for fission of peptide bonds. 1. The N-acyl to O-acyl transformation in the degradation of silk fibroin D. F. Elliott D. F. Elliott 1National Institute for Medical Research, Mill Hill, London, N.W. 7 Search for other works by this author on: Thi…
Discussion of the updated rules in the third edition of the National Electrical Safety Code.
Abstract A graphic method was developed which can be used to predict the tendency of oil field waters to precipitate calcium sulfate under a variety of conditions. Application of this method is made to the prediction of sulfate scale formation in heater treaters, boilers, oil wells, cooling systems and water injection…