Materials Literature
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Abstract The reaction of 2,3‐dihalogeno‐1,4‐naphthoquinone with dithiooxamide gave dibenzo[ b,i ]thianthrene‐5,7,12,14‐tetrone in high yield but not 2,2′‐bis(naphtho[2,3‐ d ]thiazole‐4,9‐dione) which was previously reported. A similar reaction of 3,4‐dichloro‐ N ‐phenylmaleimide with dithiooxamide also gave the corres…
Sorption-desorption reactions of orthophosphate (OP) and pyrophosphate (PP) were studied in two size fractions of Quebec soils (St. Bernard and Dalhousie) and minerals (goethite and kaolinite). Soil and mineral samples were fractionated into two separates (20.0–2.0 μm and 2.0–0.2 μm). The soils had similar mineral sui…
The joint distribution pN(ω,R1,R2) of the lengths of the vectors (R1,R2) and the angle ω between the vectors joining the center of mass of a block or bead in a chain with the centers of mass of the preceding and succeeding beads of a coarse-grained chain is investigated. Somewhat unexpectedly, the a priori and the con…
Abstract A lightweight conducting polymer composite was prepared by the incorporation of conducting polypyrrole in the pores of a host polymer to form a conductive network. The inclusion of polypyrrole in a porous cross‐linked polystyrene host polymer, prepared by the concentrated emulsion polymerization method, was c…
Germanosilicate optical fibres produced by the modified chemical vapour deposition process are characterised by point defects which disrupt the tetrahedral network structure. It is shown that the GeE' defect profiles in germanosilicate preforms and fibres, as measured by cathodoluminescence, do not follow the Ge…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and electrochemistry of copper(II) and palladium(II) hydroporphyrins: the copper(I) octaethylisobacteriochlorin anionAlan M. Stolzenberg and Leonard J. SchusselCite this: Inorg. Chem. 1991, 30, 16, 3205–3213Publication Date (Print):August 1, 1991…
ABSTRACT The maximal growth rate (μ max ) of 19 marine and estuarine diatoms decreased with increasing cell volume (V). The relationship between log μ max (Y) and log V (X) was calculated. Statistical analyses showed that the slope of the equation was not significantly different from those obtained by other researcher…
Microbial adhesion at the oil:water interface has been studied since the pioneering work of Mudd & Mudd (1924) in various contexts. A decade ago, microbial adhesion to hydrocarbons (MATH) was proposed as a general test for cell‐surface hydrophobicity. Since that time, various modifications, including a kinetic approac…
Prior finite element method calculations have previously shown that high cycle fatigue cracks start at twin boundaries, because elastic interactions produce the highest stresses there. This investigation was undertaken to test this idea. Three diffusion-bonded bicrystals of 70-30 α-brass, having a boundary plane at 45…
Systematic measurement of the electrical transport phenomena of black phosphorus grown by the all-closed bismuth-flux method has been performed in the range from room temperature down to 0.5 K for the electrical resistivity and down to 1.5 K for the Hall effect and the magnetoresistance effect. These samples exhibited…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn investigation of the interdiffusion of polystyrene and deuterated polystyrene using surface-enhanced Raman scatteringP. P. Hong, F. J. Boerio, S. J. Clarson, and S. D. SmithCite this: Macromolecules 1991, 24, 17, 4770–4776Publication Date (Print):August 1, 1991Publication…
Abstract Eighteen sterols were isolated from the aerial parts of Kalanchoe pinnata (Crassulaceae) including four novel sterols, viz. (24 R )‐stigmasta‐5,25‐dien‐3β‐ol (24‐epiclerosterol), (24 R )‐5α‐stigmasta‐7,25‐dien‐3β‐ol, 5α‐stigmast‐24‐en‐3β‐ol, and 25‐methyl‐5α‐ergost‐24(28)‐en‐3β‐ol. 24‐Epiclerosterol and its Δ…
Seasonal changes in the assemblage structure of dominant epipelic diatoms were studied along a transect crossing a salt marsh, sandflat, and mudflat of an estuarine intertidal shore at Berrow Flats, Somerset, UK. Seasonal changes in cell numbers displayed different patterns in the salt marsh and sandflat/mudflat. At s…
In the 〈110〉{001} slip system in L12 ordered alloys, both screw and edge dislocations may become locked by dissociating into nonplanar structures. In this paper the structure of edge dislocations in the [110](001) primary cube system in Ni3Ga and Ni3(Al, Ti) single crystals has been observed with weak-beam and lattice…
Abstract The solubility of L ‐serine in water was measured as a function of temperature, and the solubility in methanol‐water solutions was determined as a function of temperature and methanol concentration. Solubility in aqueous solutions was found to be a linear function of temperature. Additionally, a statistical d…
We use experimentally determined crack growth data for silica glass and a fracture mechanics model for delayed failure to predict the fatigue behavior for high‐strength silica‐glass fibers. The results of this model indicate that fracture mechanics methods can be used to adequately describe the fatigue behavior observ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and properties of mononuclear and ferromagnetically coupled dinuclear manganese complexes with 2,2'-biphenoxideAnn R. Schake, Edward A. Schmitt, Andrew J. Conti, William E. Streib, John C. Huffman, David N. Hendrickson, and George ChristouCite this: Inorg. Chem.…
High alloyed duplex stainless steels, referred to as super duplex, are being used increasingly for applications in corrosive environments. The higher Cr and Mo contents of these materials can lead to susceptibility to σ-phase precipitation, even during short time exposures to high temperatures. The 800°C aging of a hi…
The effects of corona wind on the heat transfer rate from a heated horizontal cylinder are described. Corona discharge and a corona wind are developed when a high voltage is applied to an electrode (emitter) near a grounded surface. In this study the corona wind is directed toward the lower region of the grounded cyli…
The molecular weight distributions of poly(ethylene terephthalate) fibers aminolyzed with selected primary amines (namely, methylamine, ethylamine, n-butylamine, and ethanolamine) were determined by using gel permeation chromatography. Initially the shape of the differential molecular weight distribution (DMWD) curve…