Gli aeranti nei calccestruzzi
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Mechanically determining the time of set of portland cement by moans of tho spissograph
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The National Gypsum Co. story
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Lime kiln operating costs
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L'avenir des chaux hydrauliques
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Recent developments in vertical shaft lime kilns
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Alteration of lime qualities
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The Pleated Sheet, A New Layer Configuration of Polypeptide Chains
For many years it has been assumed that in silk fibroin, stretched hair and muscle, and other proteins with the β-keratin structure the polypeptide chains are extended to nearly their maximum length, about 3.6 A per residue, and during the last decade it has been assumed also that the chains form lateral hydrogen bond…
Rotatory power and other optical properties of certain liquid crystals
A group of liquid crystals, mainly derivates of cholesterol, shows remarkable optical properties, including strong rotatory power and selective reflexion of circularly polarized light in a narrow region of wave-lengths. In this paper it is shown how these properties can be explained by the assumption that the molecule…
Interaction between thed-Shells in the Transition Metals. II. Ferromagnetic Compounds of Manganese with Perovskite Structure
Recently, Jonker and Van Santen have found an empirical correlation between electrical conduction and ferromagnetism in certain compounds of manganese with perovskite structure. This observed correlation is herein interpreted in terms of those principles governing the interaction of the $d$-shells of the transition me…
The theory of paramagnetic resonance in hydrated cobalt salts
Abstract The theory of a previous paper is applied to the paramagnetic resonance of certain cobalt salts. The splitting of the orbital levels by the crystalline field is first investigated, and then the further splitting by the spin-orbit interaction. The g-values so derived are in good agreement with experiment. The…
Recent X-Ray Diffraction Studies on the Hydrous Oxides and Hydroxides.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRecent X-Ray Diffraction Studies on the Hydrous Oxides and Hydroxides.W. O. MilliganCite this: J. Phys. Chem. 1951, 55, 4, 497–507Publication Date (Print):April 1, 1951Publication History Published online1 May 2002Published inissue 1 April 1951https://pubs.acs.org/doi/10.102…
The Strength and Weakness of Cotton Fibers
The structural reversals in cotton fibers are a preferred location of break when the fiber is ruptured in tension. With the aid of a polarizing microscope, observations were made of the fraction of fibers breaking at the reversals under various conditions of moisture content, specimen length, and chemical treatment. I…
Pyrolytic Film Resistors: Carbon and Borocarbon
AN IDEAL resistor would possess a resistance precisely adjusted to value and constant with time, temperature, voltage and frequency under all conditions of use in the application for which it is intended. Wirewound resistors, which early references to “resistance helices” suggest were the first to be employed, approac…
Crystallography and Interfacial Free Energy of Noncoherent Twin Boundaries in Copper
The crystallography and interfacial free energy of noncoherent twin boundaries in copper have been investigated. It is found that the noncoherent twin boundary is approximately parallel to a {113} plane of one crystal and to a {335} plane of the other. The ratio of the interfacial free energy of noncoherent twin bound…
EUTECTIC SOLIDIFICATION IN METALS
A study has been made of the process of solidification of the alloys of tin and lead the eutectic structure of which is typically lamellar. A technique was developed in which the rate and direction of solidification were controlled. It was demonstrated that freezing takes place by the simultaneous edgewise growth of t…
ON THE STRUCTURE OF ELEMENTARY BORON1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTON THE STRUCTURE OF ELEMENTARY BORON1J. L. Hoard, S. Geller, and R. E. HughesCite this: J. Am. Chem. Soc. 1951, 73, 4, 1892–1893Publication Date (Print):April 1, 1951Publication History Published online1 May 2002Published inissue 1 April 1951https://pubs.acs.org/doi/10.1021/…
Higher Oxides of the Lanthanide Elements. Terbium Dioxide1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigher Oxides of the Lanthanide Elements. Terbium Dioxide1D. M. Gruen, W. C. Koehler, and J. J. KatzCite this: J. Am. Chem. Soc. 1951, 73, 4, 1475–1479Publication Date (Print):April 1, 1951Publication History Published online1 May 2002Published inissue 1 April 1951https://pu…
Penetration by High-Velocity (`Munroe') Jets: I
By means of certain simplifying assumptions a formula is developed for the penetration into a ductile target by a high-velocity (`Munroe') jet. The action of the jet is divided into two stages, each making its contribution to the total penetration In the first stage a hole is formed by the lateral compression of the t…
The Heats of Formation of TiO, Ti2O3, Ti3O5 and TiO2 from Combustion Calorimetry1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heats of Formation of TiO, Ti2O3, Ti3O5 and TiO2 from Combustion Calorimetry1George L. HumphreyCite this: J. Am. Chem. Soc. 1951, 73, 4, 1587–1590Publication Date (Print):April 1, 1951Publication History Published online1 May 2002Published inissue 1 April 1951https://pub…