The Optical Design of Reflectors
"The Optical Design of Reflectors." Optica Acta: International Journal of Optics, 27(9), p. 1305
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Calorimetric investigation of a reentrant-nematic liquid-crystal mixture
An ac calorimetric study of binary mixtures of octyloxycyanobiphenyl (80CB) and hexyloxycyanobiphenyl (6OCB) reveals that the magnitude of the ${C}_{p}$ peak associated with the nematic---smectic-$A$ (N-$\mathrm{Sm}A$) transition decreases strongly with increasing concentration of 6OCB. These data are consistent with…
Intumescent coatings and their uses
Abstract Thin coats of flame‐retardant paints are unable to protect flammable substrates as there is not sufficient flame retardant in the thin coat to protect the substrate. Intumescent coatings foam and bubble when subjected to high temperatures and create multicellular cushions which prevent (a) heat from penetrati…
The Effects of Sulfur and Phosphorus on the Intergranular Corrosion of 304 Stainless Steel
This paper reports a study of the effects of sulfur and phosphorus on the sensitization and intergranular corrosion of 304 stainless steel. It is shown that sulfur has little effect on the intergranular corrosion of the material, except at the high electrochemical potentials of the Huey test and oxalic acid test. At t…
Thermoelectric power of thin polycrystalline metal films in an effective mean free path model
Starting from an effective Fuchs-Sondheimer conduction model, the theoretical expression for the thermoelectric power of polycrystalline metal films is derived. From the approximate expression for thick films, a procedure is proposed to determine the variation in the electronic mean free path.
Phase Relations in Magnesium Oxysulfate Cements
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…
Highly oriented zinc oxide films grown by the oxidation of diethylzinc
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…
On the Localization of Buckling Patterns
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…
Rubber-Thermoplastic Compositions. Part II. NBR-Nylon Thermoplastic Elastomeric Compositions
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…
Flocculation Value and Gel Structure of Sodium/Calcium Montmorillonite and Illite Suspensions
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…
Calculation of Lamellar Thickness in a Diblock Copolymer, One of Whose Components Is Crystalline
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 dynamics of cavity clusters in ultrasonic (vibratory) cavitation erosion
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…
Prediction of Molecular Weight Distributions for High-Density Polyolefins
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…
POPULATION GENETICS OF SKELETONEMA COSTATUM (BACILLARIOPHYCEAE) IN NARRAGANSETT BAY1
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…
A micromorphological study of the dissolution of silver-gold alloys in nitric acid
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…
Determination of the Polymer-Polymer Interaction Parameter for the Polystyrene-Polybutadiene Pair
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…
Dynamics of two-dimensional melting
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…
Alkane activation and functionalization under mild conditions by a homogeneous manganese(III)porphyrin-iodosylbenzene oxidizing system
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…
Packing Analysis of Carbohydrates and Polysaccharides. 11. Molecular and Crystal Structure of Native Ramie Cellulose
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 Spectra of a Water‐Containing Glass
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…