Contribución al estudio de la estructura del clinker de cemento portland (continuación)
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The colour of clay produots after burning
El propósito fundamental de asta investigación ha sido el determinar cómo influyen sobre el color de los productos cocidos los constituyentes de la arcilla, y, si es posible, determinar la naturaleza de loa compuestos y soluciones sólidas que dan lugar a las diversas coloraciones. También se realizaron ensayos con el…
Standard method of test for fineness of portland cement by air permeability apparatus
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Dielectric Materials and Applications.
ADVERTISEMENT RETURN TO ISSUEPREVArticleDielectric Materials and Applications.Charles P. SmythCite this: J. Am. Chem. Soc. 1955, 77, 6, 1714Publication Date (Print):March 1, 1955Publication History Published online1 May 2002Published inissue 1 March 1955https://pubs.acs.org/doi/10.1021/ja01611a117https://doi.org/10.10…
Dielectric Properties of Lead·Strontium Titanate
The dielectric and thermal properties and lattice dimensions of lead·strontium titanate were investigated, the solid solution being realized in the whole range of molar percentage. It was found that, lead·strontium titanate is also ferroelectric as lead·barium titanate and barium·strontium titanate. As the content of…
Radiative Corrections to Electron Scattering
The techniques and results of a previous paper are applied to the calculation of the second Born approximation of the one-photon radiative corrections to the scattering of electrons by nuclei. Nonrelativistic and high-energy approximations are calculated explicitly for pure Coulomb scattering. Modifications due to the…
Strömungsgeschwindigkeit als besonderer Faktor bei der Schwefelsäure‐Korrosion
Abstract Man hat eine Anzahl von Daten zur Verfügung, die sowohl auf Laboratoriumsmessungen als auch auf praktischer Erfahrung beruhen und die eine grobe Materialauswahl für eine mit Schwefelsäure arbeitende Apparatur ermöglichen. Was die Laboratoriumsmessungen anbetrifft, so wurden diese früher meistens mit Schwefels…
Properties of sodium carbonate‐sodium bicarbonate solutions
Abstract While investigating the absorption of carbon dioxide in sodium carbonate–bicarbonate solutions, apparently erratic variations of absorption coefficients were observed in earlier work. In an attempt to find an explanation for these variations, density, relative viscosity, pH and relative surface tension were d…
Ceramic Coatings for Nuclear Reactors A Progress Report
Ceramic coatings were prepared from materials having low absorption coefficients for thermal neutrons. They were specifically designed for application to typical high‐temperature alloy parts for use in nuclear reactors. Best results were obtained with boron‐free coatings of the frit‐refractory type, in which a high‐ba…
The Theory of the Reflectivity of Metals
The reflectivity of an ideal metal is calculated for infra-red light by a quantum-mechanical method. It is assumed that the conduction electrons in the metal absorb light by a photoelectric process which takes place near the surface, that these electrons behave as if they are free and that the light within the metal d…
Intracrystalline Swelling, Cation Exchange, and Anion Exchange of Minerals of the Montmoril-Lonite Group and of Kaolinite
Abstract The structural formulas were determined of very pure specimens of montmorillonite, bei-dellite, saponite, nontronite, hectorite, wolchonskoite, vermiculite, and batavite. The lattice perfection of these minerals and the nature and variation of their crystalline swelling depend significantly on the surface den…
Illumination of cis- and trans-Stilbenes in Dilute Solutions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIllumination of cis- and trans-Stilbenes in Dilute SolutionsRobert E. BucklesCite this: J. Am. Chem. Soc. 1955, 77, 4, 1040–1041Publication Date (Print):February 1, 1955Publication History Published online1 May 2002Published inissue 1 February 1955https://pubs.acs.org/doi/10…
Studies of the ethylenediamine‐cellulose complex. I. Decomposition of the complex by solvents
Abstract The ethylenediamine‐cellulose complex, previously described by Trogus and Hess, has been reinvestigated with regard to its stability toward a series of solvents and to the differences in the fine structure of the cellulose remaining after its decomposition. It is shown that nonpolar solvents which do not cont…
Physical Defects in Silver Halides
The concentrations of imperfections in silver halides grown from the melt were investigated by comparing the measured densities with the ideal densities computed from the lattice dimensions. The density defect of the most perfect specimen of silver bromide was $\frac{\ensuremath{\Delta}\ensuremath{\rho}}{\ensuremath{\…
THE PREPARATION OF POLYMERIZABLE SILANES CONTAINING ORGANOMETALLIC SUBSTITUENTS IN THE SIDE-CHAINS
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE PREPARATION OF POLYMERIZABLE SILANES CONTAINING ORGANOMETALLIC SUBSTITUENTS IN THE SIDE-CHAINSDIETMAR SEYFERTH and EUGENE G. ROCHOWCite this: J. Org. Chem. 1955, 20, 2, 250–256Publication Date (Print):February 1, 1955Publication History Published online1 May 2002Publishe…
Radiation Chemistry of Aqueous Ferrous Sulfate-Cupric Sulfate Solutions. Effect of γ-Rays
A decrease in the y-ray radiation yield of ferric ions, GFe+++, from 15.6 to 0.66 occurs on the addition of cupric sulfate to aqueous air-saturated ferrous sulfate solutions (1). This yield of 0.66 is attributed to an oxidation of the ferrous ion by hydrogen peroxide formed in the y-ray hot spot and is not due to oxid…
Polybenzyl type polymers
Abstract The various proposed structures for polymers derived from benzyl type compounds have been discussed and the likelihood of these structures considered in the light of a study of their preparation and properties. Both the para substituted structure of Shriner and Berger and the pendant structure of Henne and Le…
Kinetic Studies on Montmorillonites and Nontronite by the Acid-Dissolution Technique
Abstract Several montniorillonites and a nontronite were digested in hydrochloric acid at constant temperature for various periods of time. Soluble iron, aluminum, magnesium, and in two samples titanium, were determined for each digestion period. Rate of solution curves were obtained by plotting the logarithm of the p…
XVI. Scattering of electrons by charged dislocations in semiconductors
Experiments suggest that dislocations in germanium act as rows of closely spaced acceptor centres. In n-type material a dislocation accepts electrons and becomes a line of negative charge surrounded by a cylindrical region of fixed positive space charge. An array of parallel dislocations will have relatively little ef…
Some Physical Properties of Plutonium Metal
Data on some of the physical properties of plutonium metal are given, including allotropic modifications, crystal structures, transformation temperatures, melting point, densities, expansion coefficients, electrical resistance, and magnetic susceptibility.