Materials Literature
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This paper reports neutron-diffraction results on a single icosahedral quasicrystal of Al-Cu-Fe. The basic properties of the structure have been extracted using six-dimensional (6D) Patterson analysis from 219 independent orbits of reflections. Described in 6D space, the structure has hyperspace group F\ensuremath{\bi…
The behavior of miscibility gaps in liquid-solid phase diagrams has been studied schematically for III-V semiconductor quaternary solutions of the type A x B 1- x C y D 1- y such as GaInPAs and AlInPAs. The topological features of the liquidus surface affected by solid immiscibility have been the focus of our examinat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyridyl dicyanoquinodimethane acceptors for electroactive solidsH. E. Katz and M. L. SchillingCite this: J. Org. Chem. 1991, 56, 18, 5318–5324Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published inissue 1 August 1991https://pubs.acs.…
Abstract In order to understand the mutual orientation effect in photosynthetic electron transfer, two different kinds of quinone-linked porphyrins 1 and 2 with fixed orientation were synthesized. In the two compounds only orientation is different among various factors which control electron transfer. It has been foun…
In support of a structural design of the core graphite components of HTTR, comprehensive property measurements have been conducted using various test specimens taken systematically out of a full-sized log of IG-110 graphite. The measured data of seven properties have been utilized to assess the within-log variation an…
Summary An extracellular polysaccharide produced by Alcaligenes bacteria has been crosslinked to form firm gels that are stable for long periods at elevated temperatures. The biopolymer can be gelled with multivalent ions such as Cr+3; it can also be gelled at the 2, 000-to-4, 000-ppm level without Cr+3 in high-salini…
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…