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ABSTRACT Experiments indicate that gypsum can be precipitated by the mixing of seawater brines of different stages of evaporation, in addition to the previously recognized mechanisms of direct evaporative crystallization and crystallization due to temperature changes. A proposed geologic model shows how gypsum precipi…
The magnetic susceptibility for 14.3 at.% Mn and 14.3 at.% Co aluminosilicate glasses has been measured via a sensitive pendulum magnetometer from 4 to 300 K in a field of 5 kOe. For temperatures above 80 K a Curie–Weiss law was obeyed in both systems; however, below 80 K strong deviations from this law occurred. From…
Abstract Found on a specimen in the mineral collection of the National Museum of Wales, no. NMW 27.111.GR414, from the Aberllyn mine, Llanrwst mining field, North Wales, with hydrozincite on a breccia cemented by sphalerite, quartz, calcite, and ankerite. Atomic absorption and TGA analyses gave ZnO 37.8, CuO 22.0, SO…
A general theory of X-ray intensity statistics for twins by merohedry is developed based on mathematical analogy of this problem to a one-dimensional random walk. Probability distribution functions are derived (a) for intensities from a single twinned specimen, and (b) for the differences in intensities from two separ…
The temperature dependence of the magnetostriction from 80–300 K, as a function of applied field, was investigated in a series of SmxDy1−xFe2 (x = 0.86, 0.70, 0.55, 0.40, and 0.20) polycrystalline compounds. Large strains are observed in Sm0.86Dy0.14Fe2 with λ∥−λ⊥ = −1688×10−6 at room temperature and −2725 ppm at 80 K…
Abstract The effect of carbon black upon the reversion process in the sulfur-accelerated vulcanization of natural rubber has been studied. It is found that black-filled cure systems have a faster rate of vulcanization and better reversion resistance. The net decrease of trans -methine content, which is equivalent to t…
Abstract Sediments of the Tertiary Akata and Agbada Formations have been studied by mineralogical and petrographic techniques. In the Akata and Agbada shales the clays are largely detrital, with only minimal alteration attributable to the effects of burial diagenesis. Clay minerals occur in minor (<10%) amounts in…
Studies have been made of the magnetization of GdFeB and GdCoB amorphous thin films in which ratios of Gd to transition metal and B to transition metal were varied. In GdCoB alloys the Co moment decreases as the sum of the B and Gd concentration increases. Assuming a charge transfer mechanism, each Gd contributes 1.4…
Abstract This lecture reviews some representative types of aqueous corrosion problems encountered in the various facets of the petroleum industry. The fundamental processes underlying these corrosion problems are examined. In addition, commonly used methods for corrosion prevention and control which rely on modificati…
A single-ion anisotropy mechanism is considered to discuss the volume average of magnetostriction in macroscopically isotropic amorphous ferromagnetic alloys. Within the framework of our phenomenological theory, the macroscopic magnetostrictive strain vanishes only if the volume average of the local anisotropy coeffic…
In this paper a method for solving wave propagation problems of an infinite bar of arbitrary cross section has been presented. The frequency equation for finding phase velocites for longitudinal, torsional, and flexural waves have been obtained by making use of the Fourier expansion collocation method which has been d…
The magnetic susceptibility of the mixed quasi-one-dimensional system ${({\mathrm{CH}}_{3})}_{4}\mathrm{N}{\mathrm{Mn}}_{x}{\mathrm{Cu}}_{1\ensuremath{-}x}{\mathrm{Cl}}_{3}$ has been measured down to 0.32 K for $x$ ranging between 0 and 1. At 4.2 K the susceptibility starts to increase with $x$ up to $x\ensuremath{\si…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text G. Smith, "Liquid immersion method for the measurement of the refractive index of a simple lens," Appl. Opt. 21, 755-757 (1982) Export Citation BibTex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron paramagnetic resonance study of nitrogen-bridged iron porphyrin dimersLawrence A. Bottomley and Barry B. GarrettCite this: Inorg. Chem. 1982, 21, 3, 1260–1263Publication Date (Print):March 1, 1982Publication History Published online1 May 2002Published inissue 1 Marc…
Photo-induced stress relaxation was measured in amorphous selenium (a-Se) films with an a-Se/mica bimetallic structure. Thermally-induced stresses in these a-Se films were rapidly relaxed by illumination at temperatures from -50°C to room temperature. The photo-induced stress relaxation was approximated by an exponent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of the axial ligand binding reactions of (meso-tetraphenylporphyrinato)magnesium(II) with nitrogenous basesK. M. Kadish and L. R. ShiueCite this: Inorg. Chem. 1982, 21, 3, 1112–1115Publication Date (Print):March 1, 1982Publication History Published online1 May…
The process of whole molecule libration, or torsional oscillation, of molecular dipoles evolves dynamically in supercooled solutions and glasses on an observable time scale extending from picoseconds to kiloseconds and longer. This can be measured using the dielectric loss spectrum of rigid dipolar solute molecules di…
Investigations on the absorption and translocation of molybdenum (Mo) in soybean plants (Glycine max) grown in the field were conducted, and the following results were obtained. Up to the flower-bud-appearing stage, little absorption of Mo was detected. The Mo accumulation in the nodules may thus be highly dependent o…
Values for the particle alignment factor have been obtained, during the past few years, by several workers.1, 2, 3, 4 The various techniques which have been used include magnetic, x-ray, and optical experiments. However, particle alignment factors are not now routinely obtained during the processing of permanent magne…
Abstract Chemical, physical, and morphological properties of soils in a representative drainage‐toposequence in central Massachusetts were determined. The soils reflect the acid character of the glacial till derived from granitic materials by the low cation exchange capacity (CEC) and base saturation values, although…