Materials Literature
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Abstract Study of 13 oolite samples from Great Salt Lake, Utah by means of X-ray analysis, staining for aragonite with Feigl's solution, and the use of scanning and petrographic microscopes show that aragonite makes up all or more than 90% of the carbonate mineralogy of the samples. This new evidence, combined with th…
Abstract Samples of bentonite, illite, and kaolinite clays were studied for their Zn fixation properties under various pH levels, alternate wetting and drying conditions, and incubation at moisture saturation. Bentonite and illite fixed significant quantities of Zn under wetting and drying. Fixation was directly relat…
Two-component interpenetrating polymer networks (IPN) of the SIN type (simultaneous interpenetrating networks) were prepared from three different polyurethanes and two epoxies. The linear prepolymers were combined in solution, together with crosslinking agents and catalysts, films cast, and subsequently chain extended…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiphenol-A Polycarbonate Immersed in Organic Media. Swelling and Response to StressR. P. Kambour, C. L. Gruner, and E. E. RomagosaCite this: Macromolecules 1974, 7, 2, 248–253Publication Date (Print):March 1, 1974Publication History Published online1 May 2002Published inissu…
Energy spectrum of exciton polaron is studied with the dynamical CPA (coherent potential approximation), which is introduced for inelastic scattering by Einstein phonons at every lattice site. The coherent potential at energy E is determined by the potentials at energies apart from E by integral times the phonon energ…
The critical dynamical behavior of the pseudospin-phonon coupled system has been investigated in connection with the structural phase transition of molecular crystals. Based on Onsager's equation of motion, explicit expressions for three correlation functions, spin-spin correlation, phonon-phonon correlation and spin-…
Diffraction studies have enabled the deformation structure of 1T TaS2to be interpreted in terms of charge density waves arising from a Kohn anomaly. There is good agreement between the observed periodicity of the lattice distortion and the value predicted from a Fermi surface based on recent band structure calculation…
The temperature dependence of the rate of growth of Na 2 B 4 O 7 from its melt was determined between 1° and 192°C of undercooling. The maximum rate of growth was 2000 μm/min at 57°C of undercooling. Analysis of the growth data indicated that growth could occur by a screw dislocation mechanism over the entire range of…
Powders of 300-grade maraging steel have been produced by two different atomizing processes and consolidated by hot isostatic pressing, extrusion, hot rolling, or a combination of these methods. The tensile properties of the PM alloys were equivalent or superior to those of the conventionally cast and forged alloys, b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of closo-1,7-dicarbadodecarbone(12) from nido-2-carbahexaborane(9)Richard R. Rietz and M. Frederick. HawthorneCite this: Inorg. Chem. 1974, 13, 3, 755–756Publication Date (Print):March 1, 1974Publication History Published online1 May 2002Published inissue 1 March 1…
This paper is composed of five sections. Section III analyzes the Butler-type and flat-plate lenses of the accelerating lens system in the scanning electron microscope (SEM) using a field-emission gun. Section IV presents the result of an analysis of some new accelerating lens systems when three anodes are present. Th…
Using the method of temperature-dependent double-time Green's function, an expression is obtained for the dielectric susceptibility of an anharmonic crystal considering second-order terms in the dipole moment expansion and third- and fourth-order anharmonic terms in the crystal potential energy. The polarization opera…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility and molecular structure of 4-amino-3,5,6-trichloropicolinic acid in relation to pH and temperatureMax W. Cheung and James W. BiggarCite this: J. Agric. Food Chem. 1974, 22, 2, 202–206Publication Date (Print):March 1, 1974Publication History Published online1 May 2…
Stripe-geometry PbS diode lasers have been developed with cw output powers of about 1/3 W in the 4.3-μm wavelength region. A maximum cw output power in a single longitudinal mode of about 50 mW, over-all external quantum efficiencies as high as 27%, and incremental internal quantum efficiencies near 60% have been obse…
The aim of this article is to present an introductory review of those aspects of the isothermal galvanomagnetic effects in metals (which here means the electrical resistance, magnetoresistance and Hall effect) which are peculiar to the existence of an anisotropic electrical conductivity. This anisotropy may be intrins…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Characterization of Some Derivatives of Poly(ethylenimine)Timothy W. Johnson and Irving M. KlotzCite this: Macromolecules 1974, 7, 2, 149–153Publication Date (Print):March 1, 1974Publication History Published online1 May 2002Published inissue 1 March 1974http…
Edge- and screw-dislocation velocities in ``pure'' MgO single crystals have been measured as a function of stress, temperature, and valence state of the iron impurities in order to identify the rate-controlling drag mechanism for dislocation mobility. Edge dislocations have been observed to move faster than screw disl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmmonia Formation in the Catalytic Reduction of Nitric Oxide. III. The Role of Water Gas Shift, Reduction by Hydrocarbons, and Steam ReformingM. Shelef and H. S. GandhiCite this: Ind. Eng. Chem. Prod. Res. Dev. 1974, 13, 1, 80–85Publication Date (Print):March 1, 1974Publicat…
A recently described technique for direct least-squares refinement of phases has been successfully applied to the problem of phasing a 1.5 Å data set of observed structure-factor magnitudes for C. pasteurianum rubredoxin (M.W. ≃ 6100), given as a starting point a set of phases to 2.5 Å resolution as determined from he…
Abstract Many commercial elastomers exhibit good solvent resistance and high temperature stability but have limited use at low temperature. Fluorosilicone, which exhibits good low temperature properties, is limited in many dynamic applications by its poor physical strength. Phosphonitrilic fluoroelastomers are being d…