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LCAO molecular orbital overlap populations give in general much more flexible and widely useful measures of the non-Coulombic parts of covalent bond energies than do LCAO bond orders. They are immediately applicable to both π and σ bonds, including bonds involving hybrid AOs of all kinds, and they take account directl…
1. Evidence is presented that silicon uptake in the diatom Navicula pelliculosa is linked with aerobic respiration. 2. Cyanide, fluoride, iodoacetate, arsenite, azide, and fluoroacetate, at concentrations inhibitory to respiration, were also inhibitory to silicon uptake. 3. 2,4-Dinitrophenol (1 to 2 x 10(-5)M) stimula…
Measurements of the magnetic susceptibility and emission spectra have been made on zinc sulfide activated by copper and/or chlorine. The results of these measurements demonstrate that the luminescent centers are diamagnetic in the absence of optical excitation, and that of the five previously reported emissions, only…
Magnetic crystal anisotropy and magnetostriction have been measured in various single crystals of ferrites having compositions represented approximately by $M{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$, where $M$ stands for Mn, Fe, Co, Ni, and Zn in various proportions. Special attention is given to heat-treatment in a magneti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPentaerythritol Production YieldsM. S. Peters and J. A. QuinnCite this: Ind. Eng. Chem. 1955, 47, 9, 1710–1713Publication Date (Print):September 1, 1955Publication History Published online1 May 2002Published inissue 1 September 1955https://pubs.acs.org/doi/10.1021/ie50549a01…
The moduli at bending, torsion, and stretching were determined for viscose rayon fiber with different amounts of formaldehyde. A maximum value of all three moduli was obtained at about 5% fixed formaldehyde. The properties at cyclic loading were also investigated. The results indicate that the number of crosslinks are…
ABSTRACT
Abstract The oxidation of ammonia in the presence of manganous oxide‐bismuth oxide catalyst supported on small alumina spheres was studied in both fixed and fluidized beds in the temperature range from 205° to 250°C. The column used was 4½ in. in diameter and 43 in. high. The experiments were made so that the transpor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow Temperature Heat Capacity of Ceylon GraphiteWarren DeSorboCite this: J. Am. Chem. Soc. 1955, 77, 18, 4713–4715Publication Date (Print):September 1, 1955Publication History Published online1 May 2002Published inissue 1 September 1955https://pubs.acs.org/doi/10.1021/ja0162…
Results are given for the thermal conductivity, thermal diffusivity and specific heat of pyrophyllite before and after heating to temperatures up to 1200° C. Before heating, the conductivity in directions parallel to the bedding planes is about 0.01 cal cm/cm 2 s °C (0.04 joule cm/cm 2 s °C) and at right angles to the…
Abstract The purpose of the investigation was to study the effects of fillers, especially various types of carbon black and new light-colored reinforcing fillers. In the discussion of the problem, it is shown that permeability to gases is related to the rate of diffusion, and to the solubility of the gas in rubber, an…
In general, extension of an elastomer results in a degree of preferred orientation of the molecular chains composing the amorphous phase. Therefore the amorphous fraction of a partially crystalline elastomer must be related to the integrated intensity of the amorphous diffraction halo rather than to the intensity at a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Adsorption and Heats of Adsorption of Water on Spheron 6 and GraphonB. Millard, E. G. Caswell, E. E. Leger, and D. R. MillsCite this: J. Phys. Chem. 1955, 59, 9, 976–978Publication Date (Print):September 1, 1955Publication History Published online1 May 2002Published inis…
The semitheoretical expression, fc=Δn0−csFΔnc0−cs,where fc=volume fraction crystalline, Δn0=observed birefringence, c=the stress-optical coefficient, s=the stress on actual cross section, F=a known function of crystallite orientation, and Δnc0=the birefringence of a single polymer crystal, is proposed for relating bir…
Abstract Pure dry caprolactam (CL) does not polymerize on heating at 250°, but does so readily in presence of small quantities of water to yield an equilibrium polymerizate consisting of a linear polymer fraction (including some monomeric ϵ‐aminocaproic acid), unconverted lactam and higher cyclic oligomers. This equil…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of Elastomers on Carbon BlackGerard Kraus and Joseph DugoneCite this: Ind. Eng. Chem. 1955, 47, 9, 1809–1816Publication Date (Print):September 1, 1955Publication History Published online1 May 2002Published inissue 1 September 1955https://doi.org/10.1021/ie50549a03…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Strain in Oxide Cata1ysts–A1uminaE. B. Cornelius, T. H. Milliken, G. A. Mills, and A. G. ObladCite this: J. Phys. Chem. 1955, 59, 9, 809–813Publication Date (Print):September 1, 1955Publication History Published online1 May 2002Published inissue 1 September 1955https…
The C17 branched-chain fatty acid 15-methylhexadecanoic acid has been isolated in trace quantities (approximately 006% of total fatty acids) from hydrogenated ox perinephric fat.
The well-known principle that the deflection of electrons in a uniform electric field can serve to measure the distribution of their energies, has been investigated both theoretically and experimentally. Simple theory suggests a particular choice of parameters for an instrument intended for such measurements. Design e…
Abstract Theoretical results on the abrasion of rubber have been deduced from a few simple assumptions concerning the initiation of the surface damage. The abrasion is proportional to the normal load, independent of the particle size of the abrasive if the particles are polyhedral, and proportional to their mean radiu…