Standard method of test for fineness of portland cement by the turbidimeter
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Ultra modern tile production
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…
Contribución al estudio de la estructura del clinker de cemento portland (continuación)
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Measurement of the Elastic Constants of Single Crystal Cobalt
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…
Phase Equilibria in the System BaTiO 3 —CaTiO 3
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…
The melting points of chain polymers
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…
Cubic to Orthorhombic Diffusionless Phase Change— Experimental and Theoretical Studies of AuCd
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…
X-Ray Diffraction Procedures for Polycrystalline and Amorphous Materials.
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…
Melting and crystal structure: the melting parameters of some polyphenyls
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…
The permanent deformation of a cantilever struck transversely at its tip
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…
Measurements and Collision—Radiation Damage Theory of High-Vacuum Sputtering
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…
Free Magnetic Induction in Nuclear Quadrupole Resonance
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…
Electromagnetic Effects of Spin Wave Resonance in Ferromagnetic Metals
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…
Equivalent thermal circuit for nonventilated motors
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…
Voltage gradients on high-voltage lines
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.
A COMPARATIVE STUDY OF THE DEHYDRATION KINETICS OF SEVERAL HYDRATED SALTS
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…
The Synthesis of 6-Thioguanine
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Synthesis of 6-ThioguanineGertrude B. Elion and George H. HitchingsCite this: J. Am. Chem. Soc. 1955, 77, 6, 1676Publication Date (Print):March 1, 1955Publication History Published online1 May 2002Published inissue 1 March 1955https://pubs.acs.org/doi/10.1021/ja01611a082…
Dehydration of the montmorillonite minerals
Studies of the effect of dehydration at temperatures greater than 150° on sorption by montmorillonites have shown that small interlayer cations such as lithium and magnesium promote an irreversible decrease in the amount of interlamellar sorption and a consequent marked fall in the cation exchange capacity as measured…
High Temperature Heat Contents of Aluminates of Calcium and Magnesium
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh Temperature Heat Contents of Aluminates of Calcium and MagnesiumK. R. BonnicksonCite this: J. Phys. Chem. 1955, 59, 3, 220–221Publication Date (Print):March 1, 1955Publication History Published online1 May 2002Published inissue 1 March 1955https://pubs.acs.org/doi/10.10…
The Systems Zirconia‐Lanthana and Zirconia‐Neodymia
The minimum amounts of lanthana and neodymia required to stabilize zirconia into a cubic form are 30 and 20 mole %, respectively, at 980°C. X‐ray diffraction studies have established the upper limit of the two cubic solid solution regions as approximately 40 mole %. This stabilized region of the phase diagrams broaden…