Materials Literature
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The infrared absorption spectra of fused B 2 O 3 and of a series of soda borate glasses are presented. These spectra were obtained using vacuum‐pressed briquettes of the powdered glass and powdered KBr. The spectrum of fused B 2 O 3 shows quite definitely that this glass does not consist of a completely continuous tri…
The attenuation of ultrasonic waves by conduction electrons is analysed in terms of the free-electron model of a metal. At such low frequencies that the electronic free path is smaller than the wavelength, the result obtained agrees with that found by other authors using simpler concepts, but this agreement breaks dow…
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Se indica la función del tiro en cada etapa de la cocción, su efecto sobre los productos y su relación con otras variables de la combustión. Se comparan el tiro inducido y el tiro forzado. Se fijan las directrices para la cocción de diversos tamaños de tubos de drenaje.
Se estudia el efecto de una nueva adición, Lissopol N, agente tensoactivo sobre las propiedades del hormigón.
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Sugerencias prácticas para la sustitución de las hélices, diseño de las boquillas y funcionamiento de las galleteras.
Se describe el horno Hoffman, indicándose todas sus características, tanto estructurales como de funcionamiento.
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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.
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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…
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…
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…