Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
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:…
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 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…
MONTGOMERY AND ZIPPIN PROC
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…
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…
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.…
No disponible
No disponible
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…
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…
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…
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…
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…
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…
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…
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.…
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…
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…