Ein neuer beton-werkstein: ''Maclit"
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Materials Literature
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Neuartige betonstein-fertigung in verbindung mit niederdruckdampfhärtung
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The extrusion problem
Sugerencias prácticas para la sustitución de las hélices, diseño de las boquillas y funcionamiento de las galleteras.
Kiln setting and burning. The Hoffman kiln
Se describe el horno Hoffman, indicándose todas sus características, tanto estructurales como de funcionamiento.
Standard method of test for tensile strength of hydraulic-cement mortars
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The jam-socket pipe machine. An interesting U.S. developnent
Se describa un nuevo método empleado, en la Pacific Cay Products Co. (Los Ángeles), para la fabricación de este tipo de tubos. Se han separado las dos operaciones de axtrusión del tubo y de formación del manguito. La producción es mucho mayor que empleando el método corriente.
Zur mikroskopie des zements
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Rupture of rubber. III. Determination of tear properties
Abstract A method of investigating the tear behavior of rubber vulcanizates is described. The method, based on the tear criterion of Rivlin and Thomas, involves the determination of the energy required to propagate a tear and its dependence on the rate of propagation. The type of test‐piece employed and the methods of…
Theory of Steady-State Creep Based on Dislocation Climb
A theory of steady-state creep is developed using Mott's mechanism of dislocation climb. It is assumed in the analysis that the rate-controlling process is the diffusion of vacancies between dislocations which are creating vacancies and those which are destroying them. The concentration of vacancies along a dislocatio…
Electronic Population Analysis on LCAO–MO Molecular Wave Functions. II. Overlap Populations, Bond Orders, and Covalent Bond Energies
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…
SILICON METABOLISM IN DIATOMS
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…
Luminescent Centers in ZnS: Cu: Cl Phosphors
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…
Anisotropy and Magnetostriction of Some Ferrites
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…
Pentaerythritol Production Yields
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 Reaction between Cellulose and Formaldehyde
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…
XXVIII. Applications of Indium Antimonide
ABSTRACT
Low‐temperature oxidation of ammonia in fixed and fluidized beds
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…
Low Temperature Heat Capacity of Ceylon Graphite
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…
Thermal constants of pyrophyllite and their change on heating
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…
The Effect of Fillers on the Permeability of Rubber to Gases
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…