Modificaciones dieléctricas de las pastas de cemento durante el proceso de fraguado
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New techniques for new approaches to cement chemistry
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Developments in rack products and concrete industries in Europe
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Cement packing and loading terminal
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Interatomic distances and atomic valences in NaZn13
The crystal structure of NaZn_(13) and of several homologous compounds AB_(13) was reported by Ketelaar and by Zintl & Hauke to be based on space group O_h^6-Fm3c, with 8 :Na in 8(a): ¼, ¼:, ¼; ... ; 8 Zn_I in 8(b): 0, 0, 0; .... ; and 96 Zn_(II) in 96(i): 0, y, z; ... . Approximate values were reported for the pa…
The structure of synthetic polypeptides. I. The transform of atoms on a helix
The formulae are given for the Fourier transforms of a number of helical structures; namely, a thin helical wire, a set of identical atoms spaced at regular intervals on a helix, and the general case of a group of atoms repeated by the operation of a non-integer screw. General predictions are made concerning the inten…
Clay and other noncarbonate minerals in some limestones
Abstract The minerals in acid-insoluble residues, 2 microns and less in diameter, from 27 limestones and dolomites, ranging in age from Cambrian to Recent, both marine and non-marine in origin were determined qualitatively. Quartz is widespread and abundant. Illite is the dominant clay mineral in both marine and non-m…
Hydrous micas
Hydrous micas differ from normal micas in that they contain less potassium and more water. In the calculation of structural formulae from their chemical analyses, two methods have been used which rely on the following different assumptions: 1. As these minerals are often fine-grained and may contain adsorbed water, no…
The Extent of the Photochemical Reduction of Phosphotungstic Acid
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Extent of the Photochemical Reduction of Phosphotungstic AcidLyman ChalkleyCite this: J. Phys. Chem. 1952, 56, 9, 1084–1086Publication Date (Print):September 1, 1952Publication History Published online1 May 2002Published inissue 1 September 1952https://pubs.acs.org/doi/1…
Polymer Chemistry of the Linear Siloxanes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer Chemistry of the Linear SiloxanesE. L. Warrick, M. J. Hunter, and A. J. BarryCite this: Ind. Eng. Chem. 1952, 44, 9, 2196–2202Publication Date (Print):September 1, 1952Publication History Published online1 May 2002Published inissue 1 September 1952https://pubs.acs.or…
Metal Transfer and Wear
A new theory of metal transfer and wear is suggested in this paper. The essence of the theory is as follows: Metal transfer and wear take place at points of actual contact. The interfaces of the high spots that actually make contact are roughened as the result of plastic deformation when they carry normal load. The me…
Magnetic Viscosity under Discontinuously and Continuously Variable Field Conditions
For a ferromagnetic specimen exhibiting magnetic viscosity, the intensity of magnetization increases continuously with time under steady external field conditions An account is given here of investigations to determine the influence on magnetic viscosity of changes in the magnetic field applied to the specimen, two ca…
The unit cell and space-group of alamosite (PbSiO3)
Alamosite was first described by Palachc and Merwin, i who thought it might be isomorphous with wollastolfite. For that reason it has been re-examined, using X-ray methods. A specimen from the original locality at Alamos, Sonora, Mexico (B.M. 1910,330) was made available through the courtesy of the British Museum (Nat…
The Solubilities of Oleic and Linoeic Acids in Common Organic Solvents
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Solubilities of Oleic and Linoeic Acids in Common Organic SolventsC. W. Hoerr and H. J. HarwoodCite this: J. Phys. Chem. 1952, 56, 9, 1068–1073Publication Date (Print):September 1, 1952Publication History Published online1 May 2002Published inissue 1 September 1952https:…
Phase Relations of the Alkali Feldspars: I. Introductory Remarks
Monoclinic K-feldspars and triclinic Na-feldspars at high temperatures form a "continuous" series of mix crystals. The apparent lack of a discontinuity in the monoclinic-triclinic solid-solution series has been puzzling. A transition from monoclinic to triclinic symmetry was found to exist and is here described. The c…
The Temperature Dependence of the Viscosity of Liquids
The equation logη=A+B/(T+C) is obtained as a simple modification of Andrade's viscosity equation by treating the activation energy as a function of temperature, A, B, and C being free parameters. This is shown statistically to express adequately the temperature dependence of viscosity over substantial ranges of temper…
Small Subgroups of Finite-Dimensional Groups
MONTGOMERY AND ZIPPIN PROC
FURTHER OBSERVATIONS ON DENDRITIC GROWTH IN METALS
The direction of dendrite growth has been determined as a function of crystallographic orientation for high purity tin and zinc, using a single crystal decanting technique. Measurements are reported on the rate of dendrite growth in lead, and the spacing between dendrite rows of a lead crystal for varying amounts of s…
A Method for Predicting the Tendency of Oil Field Waters To Deposit Calcium Carbonate
Abstract The authors previously presented a method for predicting the tendency of oilfield waters to deposit calcium sulfate. The present paper gives a similarmethod for calcium carbonate. Methods for predicting calcium carbonate scaling tendencies in fresh watershave been available for some time, but these could not…
Mastication of rubber, I. Mechanism of plasticizing by cold mastication
Abstract A mechanism is proposed for the degradation of natural rubber by the cold mastication process. The rubber hydrocarbon is considered to be ruptured into free radicals by the deformation of the rubber. These recombine, or react with oxygen or other suitable reactant, and thereafter do not necessarily recombine.…