Small Subgroups of Finite-Dimensional Groups
MONTGOMERY AND ZIPPIN PROC
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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.…
Estudios sobre yeso: retraso de fraguado, impermeabilización y aireado
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Gipshilfsprodukte, ihre anwendung und wirkung
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Electrical and Optical Properties of Rutile Single Crystals
Clear, synthetic rutile (Ti${\mathrm{O}}_{2}$) single crystals have been investigated by electrical and optical methods. It seems possible to correlate the high temperature conductivity (${E}_{G}=3.05$ ev) with the threshold of optical absorption at low temperatures (3.03 ev) and with the maximum of the photoconductiv…
Ideal copolymers and the second‐order transitions of synthetic rubbers. i. non‐crystalline copolymers
Abstract Theoretical and practical evidence is put forward to show that copolymers can be treated like solutions of small molecules in the interpretation of packing phenomena, and that ideal volume‐additivity of the repeating units in copolymers is frequently realized. On this basis equations are derived for predictin…
The spin-Hamiltonian and line widths in nickel Tutton salts
Abstract An account is given of the derivation and properties of a spin-Hamiltonian which has recently been used to describe the results of magnetic resonance experiments on nickel Tutton salts. It is obtained on the assumption that the nickel ions are situated in a field of rhombic symmetry. A theory of line widths i…
The effect of the temperature of preparation on the mechanical properties and structure of gelatin films
Abstract Gelatin films prepared by evaporation from aqueous solution at temperatures of 60°C and above differ considerably in structure and mechanical properties from films dried slowly at 20°C, when gelling precedes dehydration. In the high-temperature preparation dehydration precedes the formation of a continuous st…
The imaging properties of electron beams in arbitrary static electromagnetic fields
Abstract Electron-optical systems with curved axes—such as mass spectrographs and certain beta-ray spectrometers—have long been in practical use, but there has been available no complete theory of the aberrations of such systems. It is the object of the present paper to construct such a theory and to demonstrate, by a…
Anisotropy in the Antiferromagnetic MnF2
The major part of the anisotropy in the paramagnetic susceptibility of Mn${\mathrm{F}}_{2}$ above the Curie point, as measured by Stout and Griffel, can be accounted for by magnetic dipole interactions. These interactions affect the anisotropy in different ways above and below the Curie point and lead to an anisotropy…
The study of crystal growth with the electron microscope II. The observation of growth steps in the paraffin n -hectane
Abstract Examination of the paraffin n-hectane in the electron microscope has given evidence of two different growth mechanisms for crystals of this compound. The one corresponds to the spiral growth mechanism already observed for n-hexatriacontane (Dawson & Vand 1951), and the orthorhombic lozenge-shaped crystals…
Corrosion Control with Organic Inhibitors
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrosion Control with Organic InhibitorsJ. N. BrestonCite this: Ind. Eng. Chem. 1952, 44, 8, 1755–1761Publication Date (Print):August 1, 1952Publication History Published online1 May 2002Published inissue 1 August 1952https://pubs.acs.org/doi/10.1021/ie50512a021https://doi.…
Polymerization of drying oils. VI. Catalytic polymerization of fatty acids and esters with boron trifluoride and hydrogen fluoride
Summary At relatively low temperatures boron trifluoride and hydrogen fluoride gave high yields of polymers from soybean fatty acids and methyl esters. The use of 2% boron trifluoride as catalyst at 150° to 200° resulted in the polymerization of 50–60% of the methyl esters within one hour. The viscous polymeric fracti…
The Spectra of α,β,γ,δ-Tetraphenylchlorin and its Metallo-derivatives
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Spectra of α,β,γ,δ-Tetraphenylchlorin and its Metallo-derivativesG. D. Dorough and F. M. HuennekensCite this: J. Am. Chem. Soc. 1952, 74, 16, 3974–3976Publication Date (Print):August 1, 1952Publication History Published online1 May 2002Published inissue 1 August 1952http…
Pitting Corrosion Characteristics of Aluminum - Influence of Magnesium and Manganese.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPitting Corrosion Characteristics of Aluminum - Influence of Magnesium and Manganese.P. M. Aziz and Hugh P. GodardCite this: Ind. Eng. Chem. 1952, 44, 8, 1791–1795Publication Date (Print):August 1, 1952Publication History Published online1 May 2002Published inissue 1 August…
Effect of Temperature on Corrosion of Metals by Water
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Temperature on Corrosion of Metals by WaterNorman HackermanCite this: Ind. Eng. Chem. 1952, 44, 8, 1752–1755Publication Date (Print):August 1, 1952Publication History Published online1 May 2002Published inissue 1 August 1952https://pubs.acs.org/doi/10.1021/ie50512a…
Some Physical Properties of Diacetone Alcohol, Mesityl Oxide and Methyl Isobutyl Ketone
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome Physical Properties of Diacetone Alcohol, Mesityl Oxide and Methyl Isobutyl KetoneE. T. J. Fuge, S. T. Bowden, and W. J. JonesCite this: J. Phys. Chem. 1952, 56, 8, 1013–1016Publication Date (Print):August 1, 1952Publication History Published online1 May 2002Published i…
Action of Sodium Silicate as a Corrosion Inhibitor in Water Piping
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAction of Sodium Silicate as a Corrosion Inhibitor in Water PipingLeo Lehrman and Henry L. ShuldenerCite this: Ind. Eng. Chem. 1952, 44, 8, 1765–1769Publication Date (Print):August 1, 1952Publication History Published online1 May 2002Published inissue 1 August 1952https://pu…