Materials Literature
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The frictional adhesion between projectile and target during a ballistic penetration has been measured with a torsion-type Hopkinson bar. The apparatus allows measurement of the torsional adhesion of a spinning projectile during target penetration. By assuming the friction resisting rotation to be equal to that resist…
Tongue-tear tests were made on samples of acetate fabrics, varying certain controlled factors: weave, texture, yarn twist, and yarn structure. An analysis of the resulting experimental data showed certain relationships between these fabric factors and tear strength. A qualitative discussion was made of tearing action—…
The empirically determined values of the parameter Dq, which in transition-metal complexes, measure the influence of the ligands on the metal d-orbitals are interpreted theoretically. A quantitative treatment of ``the magnetic criterion of the bond type,'' is given. Values of Slater-Condon parameters for transition me…
CLOSTRIDIUM OEDEMATIENS n-ANTIGEN 315 3. The viscosity-reducing action is due to a sulphydryl-activated enzyme, which has been named a tropomyosinase, whose action is inhibited by homologous antisera.
It is concluded from torque measurements on single crystals of Alnico 5 that the high coercive force of these crystals depends upon the shape anisotropy of the fine precipitated plates and that the crystal anisotropy of the plates is negligible. The present physical picture of the alloy is that it consists of plates o…
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…