Materials Literature
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Abstract The plasticity and viscoplasticity of polycrystalline materials are studied analytically in terms of lattice dislocations, with the principal effects attributed to non-extended obstacles. Non-equilibrium statistical mechanics is used to describe the evolution of the dislocation structures during loading and…
The correct postal code is Edinburgh EH93JZ.Equation (2) should read 8 R' $(R)dR =P(T,R ') ""' 'exp -' + [1+O(e,T,R ')], To El d R «+'&~d «+ & (2p) &" +'& =2/&[
A single heat transfer measurement technique was used to determine the thermal insulating capabilities of four materials used in outdoor clothing-goose down, wool, polyester, and polyolefin. It was found that all provide very similar degrees of insulation.
Asahi Chemical started research and development of the ion-exchange membrane chlor-alkali process in 1966. Research was carried out on the effects of the type of ion-exchange group, ion exchange capacity, degree of crosslinking, membrane structure, caustic concentration, and many other parameters on current efficiency…
The past 15 years have witnessed an explosive growth in the literature on ionomers, i.e. ion-containing copolymers in which up to 15 mol % of the repeat units contain ionic groups. Two monographs have appeared on the subject(1,2), as well as proceedings of several symposia(3), in addition to a large number of individu…
Two approaches are proposed to describe a system of interacting rotors. The version developed of the self-consistent-field approximation, explicitly including simplifications related to the quasi-oscillatory nature of molecular motion in the orientationally ordered phase, makes it possible to consider anharmonic effec…
Abstract Two techniques for eliminating the unsiderable effect of anodic protection on installations connected to the protected equipment were tested. Model measurements were carried out in a 50% solution of sulfuric acid at 20°C with a type FeCr 18 Ni9 Ti stainless steel under potentiostatic conditions. The use of an…
Abstract Chain extension of partially neutralized carboxyl‐terminated liquid polybutadiene (PB) with bisepoxide was investigated by the carboxyl–epoxide reaction. The partially neutralized liquid PB were prepared, by the partial neutralization with MgO and CaO, from a carboxyl‐terminated liquid PB (Hycar CTB 2000X162)…
The measurement of the dielectric loss of insulating material or electrical apparatus with the Schering bridge at power frequency is one of the most fundamental dielectric tests for evaluating insulation behavior. It has been pointed out that a negative error or even an apparent negative reading of tanδ may result if…
Abstract Four laboratory prepared catalysts (Ni/Al 2 O 3 , NiNaY‐uncalcined, NiNaY‐calcined, NiCaY‐calcined) and a commercially available catalyst G‐87 were studied for their deactivation behavior over a period of 24 h at 573 k for various H 2 /CO ratios (3.1, 3.8, 6.4 and 24.5). The results indicated that the activit…
Abstract The formation of polyelectrolyte complexes of glycol chitosan (GlChi) with sodium salts of dextran sulfate (DS), carboxymethyl cellulose (CMC), polygalacturonic acid (GalUA) n , and alginic acid (AlgA) has been studied. The number of ionizable groups per pyranose ring and the degree of dissociation as a funct…
<div class="htmlview paragraph">The purpose of this paper is to describe the advantages and validity of substituting the high-performance zinc casting alloys, ZA-12 and ZA-27, for bronze in selected low-speed, medium temperature bearing and bushing applications.</div> <div class="htmlview paragraph">…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase-dependent stereochemistry and chemical activation in the thermal decomposition of 2,3-diazabicyclo[2.1.1]hexeneMoon Ho Chang and Dennis A. DoughertyCite this: J. Am. Chem. Soc. 1982, 104, 4, 1131–1132Publication Date (Print):February 1, 1982Publication History Publishe…
The ground-state transition is observed in the double-charge-exchange reaction $^{48}\mathrm{Ca}$($^{18}\mathrm{O}$, $^{18}\mathrm{C}$) $^{48}\mathrm{Ti}$ at 100 MeV. A mass excess of 24.82 \ifmmode\pm\else\textpm\fi{} 0.30 MeV is measured for $^{18}\mathrm{C}$.NUCLEAR REACTIONS $^{48}\mathrm{Ca}$($^{18}\mathrm{O}$, $…
A statistical experiment has been conducted to investigate the influence of silica fillers on the mobility of poly(vinyl chloride -co-vinyl acetate) molecules as reflected in glass transition temperatures. Measurement of glass transitions was made graphically from DSC curves. The data showed that the glass transition…
The effect of applied potential on the Intergranular stress corrosion cracking (IGSCC) of sensitized Type 304 stainless steel has been studied in deaerated dilute Na2SO4 solution at 285 C using constant deflection (single and double U-bend specimens) and constant load (as polished and preoxidized specimens) techniques…
Theoretical packing densities are derived for dense random packing of hard spheres for single‐valued and for multivalued particle diameters. The optimum particle‐size distribution for maximum density is calculated. The results are compared with packing densities for close‐packed arrangements. The results may be useful…
The effect of copper (metallic and up to 1 ppm. dissolved in solution), temperature (60 C to 90 C), and pH (6 to 9) on hydrogen formation from mild steel in oxygen free water was investigated. The formation rate was found Independent of temperature not only up to 90 C, but a comparison with work elsewhere indicates th…
The crystallization of Bombyx mori L. silk fibroin was carried out from a regenerated solution maintained in contact with air under a steady-state flow. The nucleation occurs at first close to the solution surface after a few seconds of stirring and then a fibrillar crystal propagates. The nucleation was considered to…
It is shown that semiflexible polymers exhibit lyotropic liquid crystallinity once a threshhold solution concentration is surpassed. These polymers, namely polyisocyanides, polyorganophosphazenes, polyacenaphthylene, and cellulose derivatives, are characterized by persistence lengths or characteristic ratios experimen…