Materials Literature
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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…
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…
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…
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.
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…
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…
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.…
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…
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…
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.
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…
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 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…
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…
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…
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…
The system BaTiO 3 –SiO 2 is characterized by two congruently melting compounds and a compound having a subsolidus stability maximum. A barium analogue of the mineral sphene, BaTiSiO 5 , was shown to melt congruently at 1400°C, and BaTiSi 2 O 7 melted congruently at 1250°C. The gem mineral benitoite (BaTiSi 3 O 9 ) wa…
This paper gives a survey of films and film combinations used for reflecting optics. The preparation and properties of unprotected mirror coatings, protective layers for front surface mirrors, reflection filters, and replica mirrors are discussed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of Carbon Deposited from Carbon Monoxide on Iron, Cobalt and NickelL. J. E. Hofer, E. Sterling, and J. T. McCartneyCite this: J. Phys. Chem. 1955, 59, 11, 1153–1155Publication Date (Print):November 1, 1955Publication History Published online1 May 2002Published inis…
Summary The linear strain hardening observed after the easy glide region in face-centred cubic single crystals at sufficiently low temperature is explained by assuming that all the Frank-Read sources of the active slip system are in action, and form small active slip planes bounded on all four sides by Cottrell barrie…