Materials Literature
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Solubilities of MgO in H 2 SO 4 solutions were measured and X‐ray analyses of over 100 neat cement samples were used to construct an isothermal phase diagram for the system MgO‐H 2 SO 4 ‐H 2 O at 23°±3°C. The phases MgO, Mg(OH) 2 , 3Mg(OH) 2 MgSO 4 ·8H 2 O (3·1·8), MgSO 4 ·7H 2 O, MgSO 4 ·6H 2 O, and MgSO 4 ·H 2 O wer…
Zinc oxide films, with a high degree of c-axis orientation, have been grown on glass substrates by a chemical vapor deposition process involving the oxidation of diethylzinc. Film growth was carried out over the 200–500 °C temperature range; however, the maximum crystal orientation was found to occur with substrate te…
The possibility of localization of a buckling pattern is investigated for a class of structures in which the initial buckling mode is periodic. A simple model indicates that the basic mechanism of localization involves a bifurcation at the maximum load point. This model also illustrates a clear analogy between localiz…
Abstract Thermoplastic elaslomeric compositions based on crosslinked NBR and nylon can be produced. A variety of nylons of differing melting points and NBR's of differing AN contents can be used in a broad range of proportions. The compositions can be further altered by the incorporation of fillers and plasticizers. T…
Abstract The flocculation value, the minimum salt concentration which causes flocculation within 24 hours, was determined for mixtures of Na‐ and Ca‐montmorillonite (API‐25) and Fithian illite (API‐35). The equivalent fraction of exchangeable Na + , E Na , varied from 0 to 1. We prepared Na/Ca clay suspensions by addi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalculation of Lamellar Thickness in a Diblock Copolymer, One of Whose Components Is CrystallineE. A. DiMarzio, C. M. Guttman, and J. D. HoffmanCite this: Macromolecules 1980, 13, 5, 1194–1198Publication Date (Print):September 1, 1980Publication History Published online1 May…
The erosion of solids caused by cavitating liquids is a result of the concerted collapse of clusters of cavities. In vibratory cavitation equipment the clusters grow and collapse adjacent to a solid surface and are typically of hemispherical or cylindrical form. In the present paper the collapse process of these clust…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrediction of Molecular Weight Distributions for High-Density PolyolefinsEric J. Nagel, Valery A. Kirillov, and W. Harmon RayCite this: Ind. Eng. Chem. Prod. Res. Dev. 1980, 19, 3, 372–379Publication Date (Print):September 1, 1980Publication History Published online1 May 200…
ABSTRACT During a two year period 457 clones of the diatom Skeletonema costatum were isolated prior to and during the summer‐fall and winter‐spring blooms of this species in Narragansett Bay, R.I. Their allozyme banding patterns were examined for 5 enzyme loci. Genotypic frequencies indicated that the winter bloom pop…
Microscopic observations of the surface structure and composition of thin films of silver-gold alloys are used to deduce the processes involved in the dissolution of these alloys in nitric acid solutions. The micromorphology consists of an island-and-channel structure whose formation depends in detail on the initial o…
The light scattering technique was utilized to measure the phase separation temperatures (cloud points) of mixtures containing a polystyrene and a polybutadiene of various molecular weights and also of mixtures containing a polystyrene and a random or block copolymer of styrene and butadiene. The data was analyzed to…
The dynamics of melting in two dimensions is studied, assuming that solids melt into liquids via a sequence of dislocation and disclination unbinding transitions. The hydrodynamics of solids, hexatics, and liquids in the presence of dislocations and disclinations is described as well as the dynamical response near the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkane activation and functionalization under mild conditions by a homogeneous manganese(III)porphyrin-iodosylbenzene oxidizing systemCraig L. Hill and Bruce C. SchardtCite this: J. Am. Chem. Soc. 1980, 102, 20, 6374–6375Publication Date (Print):September 1, 1980Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPacking Analysis of Carbohydrates and Polysaccharides. 11. Molecular and Crystal Structure of Native Ramie CelluloseCarrie Woodcock and Anatole SarkoCite this: Macromolecules 1980, 13, 5, 1183–1187Publication Date (Print):September 1, 1980Publication History Published online…
Infrared absorption was measured on an NajO‐K 2 O‐ZnO‐Al 2 O 3 ‐SiO 2 glass with up to ∼11 wt% water. Fundamental and overtone‐combination bands were observed at 1.41, 1.91, 2.22, 2.87, and 6.1 μm. Molar absorptivities were determined for the hydrated glass for H 2 O and OH levels using the molar absorptivity calculat…
Kinetic secondary electron emission from a solid target resulting from incidence of keV electrons or keV and MeV ions is treated theoretically on the basis of ionization cascade theory. The energy and angular distribution and the yield of secondary electrons are calculated for a random target. These quantities are det…
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