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A MATHEMATICAL ANALYSIS OF SOLUTE REDISTRIBUTION DURING SOLIDIFICATION
A mathematical analysis is made of the redistribution of solute which occurs during the solidification, without convection, of a single-phase alloy. Calculations of solute distributions are carried out for steady state conditions, and for the transient changes in solute concentration, both in the solid and in the liqu…
The amino acid composition of mammalian collagen and gelatin
hyde, but the most serious errors arise when small quantities of amino sugar are estimated in the presence
Dynamics of vapor bubbles and boiling heat transfer
Abstract Analytical expressions for bubble radii and growth rates derived by the authors are applied in an analysis of surface boiling at high heat transfer rates. It is shown that the product of bubble radius and radial velocity is a constant, independent of the bubble radius. This circumstance permits the formulatio…
Electronic Population Analysis on LCAO-MO Molecular Wave Functions. IV. Bonding and Antibonding in LCAO and Valence-Bond Theories
It is shown that there is a practically one-to-one correspondence between the occurrence, on the one hand, of positive (bonding) and negative (antibonding) overlap populations in LCAO theory and, on the other hand, of bonded attractions and nonbonded repulsions in VB (valence-bond) theory. This correspondence is discu…
Effect of Shape Anisotropy on the Coercive Force of Elongated Single-Magnetic-Domain Iron Particles
Elongated single-magnetic-domain iron particles, 150 angstrom units in diameter, have been prepared with properties that definitely confirm the existence of a shape anisotropy effect on coercive force. This conclusion is based upon four observations: (1) Torque curve analysis shows the predominating anisotropy effect…
An Approach to Elongated Fine-Particle Magnets
The coercive force predicted by theory for single-domain particles with shape anisotropy frequently far exceeds the observed value. From an examination of the results of Paine, Mendelsohn, and Luborsky on elongated iron particles, several approximate models are suggested which may exist in certain experimental situati…
Studies on the mechanism of mastication of rubber. IX. Scission of squalene molecule with benzoate free radical
Abstract Squalene was treated with benzoyl peroxide and isoprene‐dialcohol dibenzoate was isolated. It is now proved for the first time that the molecule of polyisoprene was decomposed by a free radical and the location of the scission was the CH 2 CH 2 linkage.
The relationship between the dielectric constant and water‐vapor accessibility of cellulose
Abstract The relationship between the water‐vapor accessibility of cellulose and its dielectric constant at 10,000 cycles per second and 30°C. has been examined. Six different celluloses were studied. These included a cotton linters, a hydrolyzed cellulose, two regenerated celluloses, and two bleached wood pulps. In t…
Lithium Absorption by Kaolin Minerals
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLithium Absorption by Kaolin MineralsR. Greene-KellyCite this: J. Phys. Chem. 1955, 59, 11, 1151–1152Publication Date (Print):November 1, 1955Publication History Published online1 May 2002Published inissue 1 November 1955https://pubs.acs.org/doi/10.1021/j150533a009https://do…
Crystallization in natural rubber. IV. Temperature dependence
Abstract Experiments are described in which the temperature dependence of crystallization in natural rubber, unvulcanized and vulcanized by a peroxide, was investigated dilatometrically over the temperature range −37 to 0°C. Avrami type time functions describe the progress of crystallization to a first approximation.…
CXXXI. Effect of temperature on the flow stress of work-hardened copper crystals
Summary Changes in the flow stress of copper crystals due to changes in the temperature of deformation have been measured over a range of strains and temperatures. After correction for the effect of temperature on elastic constants the flow stress proves to be insensitive to temperature from 90°k to 180°k, falls rapid…
Photometric Method for Estimation of Elastase Activity.
A colorimetric method for the estimation of elastase activity has been presented. When dyed elastin substrate prepared from horse ligamentum nuchae is used, the pH optimum lies between 8.7 and 9.4, and the reaction velocity is linear only when less than 35% of the elastin is dissolved. When compared with the gravimetr…
Umwandlungskinetik der Sigmaphase in einer Eisen‐Chrom‐Legierung mit 48% Cr
Magnetische Untersuchung der isothermischen α‐σ‐ und σ‐α‐Umwandlung in einer Eisen‐Chrom‐Legierung mit 48% Cr. Gleichung für den zeitlichen Verlauf der α‐σ‐Umwandlung. Paramagnetische Untersuchung der Sigmaphase.
Optical Properties of Cesium Iodide*
The refractive indices of CsI were determined at three temperatures near 15, 24, and 34°C for wavelengths from 0.29 micron in the ultraviolet to 53 microns in the infrared. The thermal coefficients of index were determined for each wavelength and all data were reduced to 24°C. A dispersion equation of the Sellmeier ty…
Effect of Firing Cycle on Structure and Some Dielectric and Piezoelectric Properties of Barium Titanate Ceramics
In the preparation of barium titanate ceramics for dielectric and piezoelectric applications, careful attention must be given to many factors which determine the ultimate performance of the ceramic. In this study structural differences were observed with the aid of electron micrographs as the time and temperature of f…
Low Magnetic Saturation Ferrites for Microwave Applications
Low magnetic saturation ferrites suitable for microwave applications can be prepared in the magnesium aluminum ferrite system. These ferrites can be prepared to possess also relatively high permeabilities at carrier frequencies. Curie temperatures, coercive forces, magnetic saturations at 25°C, and initial permeabilit…
51—The Strength and Behaviour of Nylon/Cotton Blended Yarns Undergoing Strain
Stress-strain curves have been obtained for a series of yarns containing a range of proportions of cotton and nylon. At strains less than the breaking strain of the all-cotton yarn these curves can be interpreted in terms of the stress-strain behaviour of the all-cotton and all-nylon yarns. Certain anomalous features…
Effects of Radiation on Organopolysiloxanes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of Radiation on OrganopolysiloxanesE. L. WarrickCite this: Ind. Eng. Chem. 1955, 47, 11, 2388–2393Publication Date (Print):November 1, 1955Publication History Published online1 May 2002Published inissue 1 November 1955https://pubs.acs.org/doi/10.1021/ie50551a053https…
The structure of tussah silk fibroin (with a note on the structure of β-poly-L-alanine)
A detailed structure for Tussah silk fibroin has been derived which is in agreement with the X-ray diffraction data. The structure is similar to that of Bombyx mori fibroin in that it is based on antiparallel-chain pleated sheets; the method of packing of the sheets, however, is quite different. This difference in pac…