Materials Literature
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The absorption of high‐frequency (60 kc. to 20 me. per second) sound waves in fused silica shows a large peak at low temperatures (30° to 50°K.). This absorption appears to result from some property of the glassy state since the absorption does not occur in crystalline silica. Data are presented showing the variation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCellulose and Cellulose Derivatives.Ward PigmanCite this: J. Am. Chem. Soc. 1955, 77, 8, 2349Publication Date (Print):April 1, 1955Publication History Published online1 May 2002Published inissue 1 April 1955https://pubs.acs.org/doi/10.1021/ja01613a114https://doi.org/10.1021/…
Las experiencias realizadas en Anchor Concrete Products, Inc., Buffalo, N.Y., y otras instalaciones construidas recientemente, ponen de manifiesto las ventajas de los autoclaves cilíndricos de gran diámetro.
Una nueva fábrica de piezas prefabricadas de hormigón dedica sus actividades a la preparación de tejas de hormigón, en el futuro alcanzará una producción diaria de 36.000. En este artículo se den las características de la instalación, proceso de fabricación y piezas fabricadas. Las ventajas son considerables.
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Como consecuencia del empleo; cada día creciente, de los azulejos en la construcción, se revisan continuamente los viejos métodos de producción de aquéllos. En este artículo se resumen las principales características de la producción de azulejos en una de las fábricas más modernas, de la Stylon Southern Corporation, e…
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The 5 elastic constants of hexagonal cobalt have been determined using pulse modulated ultrasonic waves which are reflected back and forth within the crystal. Frequencies between 10 and 30 Mc/sec were used. Values of the constants were derived from 11 measurements of wave velocities for longitudinal and shear modes in…
The system BaTiO 3 –CaTiO 3 was investigated from room temperature to 1900°C. by several different techniques. The system is characterized by extensive solid solution with a minimum at 18 wt.% CaTiO 3 . The extent of solid solution decreases rapidly with temperature from a maximum of approximately 30 wt.% in each end…
Abstract The molecular characteristics which determine the melting points of high polymer crystals are considered, and it is shown that the properties of monomeric crystals often throw light on those of the polymers. The principal factors controlling melting points appear to be molar cohesion energy (of the whole mole…
A theoretical analysis of the cubic to orthorhombic transformation is presented which predicts for a partly transformed crystal, the interface plane, orientation relationships, and macroscopic distortions from a knowledge only of the lattice parameters of the initial and final phases. Arguments are advanced to show th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-Ray Diffraction Procedures for Polycrystalline and Amorphous Materials.A. L. PattersonCite this: J. Am. Chem. Soc. 1955, 77, 7, 2030–2031Publication Date (Print):April 1, 1955Publication History Published online1 May 2002Published inissue 1 April 1955https://doi.org/10.102…
Abstract Melting mechanisms have been studied for diphenyl, and o-, m- and p-terphenyl. The volume increase on melting is largest for the linear polyphenyls and smallest for branched molecules which can interlock in the melt. In no case will the volume increase permit the ‘onset of rotation’ on melting. Viscosity meas…
Abstract An analysis is given for the deformation of a cantilever made from a rigid-plastic material struck transversely at its tip by a moving mass. Two special cases are found to be of interest: mass of striker large, and mass of striker small. Experiments were carried out on model mildsteel cantilevers under these…
A brief summary of some of the important experimental and theoretical work related to the subject of metallic sputtering is presented. The need for measurements in high vacuum is indicated and an ion beam which utilized a Philips Ion Gauge discharge ion source to make high-vacuum sputtering ratio measurements is descr…
The free precession of an ensemble of nuclear quadrupole moments in an axial electric field gradient is studied by the pulsed nuclear induction method. A quantum-mechanical analysis describes the free precession and spin echo signals which result from the application of single and double pulses of radio-frequency fiel…
It was shown experimentally by Rado and Weertman that under suitable conditions there is an observable effect of exchange interactions on the ferromagnetic resonance in metals. The present paper provides an electromagnetic theory of this "spin wave resonance" experiment and satisfactorily explains the exchange shift a…
ALTHOUGH heating is one of the chief limitations in the rating of induction machines, present methods of predicting heating leave much to be desired. Articles have been written on the subject of heating of very large motors and generators,1,2but relatively little appears to have been done toward developing accurate an…
AKNOWLEDGE of the voltage gradient which exists at the surface of a transmission-line conductor is necessary in many instances. This knowledge is especially important in studies regarding corona losses and radio interference.
Rates of dehydration under full vacuum, and also as the pressure of water vapor due to the dehydration process was allowed to increase, have been determined for a number of hydrated salts. The dehydration of manganous sulphate tetrahydrate, zinc sulphate heptahydrate, nickel sulphate hexahydrate, and magnesium sulphat…