Materials Literature
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The physical and electrical properties of crosslinked polyethylene (XLPE) and ethylene propylene rubber (EPR) are compared in the context of their use in transmission class cables. Results indicate that the 138-kV XLPE cable has AC withstand/breakdown strength at least 25% higher than the 150-kV EPR cable. The XLPE ca…
Abstract In this paper the results of investigations on the mechanism of EPM peroxide vulcanizations in the presence of various bis(allyl)esters of aromatic diacids—as coagents—are presented. These coagents are commonly used in the rubber industry to increase the crosslinking efficiency, however, until now the mechani…
The tracer diffusion coefficient is analyzed for the case in which internal ionization equilibria have to be considered, using the concept of conservative ensembles. The relationships of the tracer diffusion coefficient with other phenome‐nological parameters, viz., the chemical diffusion coefficient and the diffusion…
Abstract Thermoluminescent characteristics are presented of MgB4O7:Mn, a newly developed nearly tissue-equivalent phosphor, with a simple glow curve, high sensitivity, without fading over a few months, and attractive features for dosimetric application. The dosimetric properties of this TL material examined in this st…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSymmetrical and unsymmetrical quadruply aza-bridged closely interspaced cofacial bis(5,10,15,20-tetraphenylporphyrins). 4. Structure and conformational effects on electrochemistry and the catalysis of electrochemical reduction of dioxygen by doubly, triply, and quadruply N,N…
Abstract The rate of heat release from a thermally thin material burning on both sides will be more than twice the value seen when only one side is burning. Two simplified models demonstrate that this is a consequence of the Arrhenius temperature dependence of the gasification rate of the solid. Experiments carried ou…
An analytical treatment of quasi-equilibrium carrier transport in disordered materials at moderate electric fields is presented. The transport equation derived has the form of a conventional Fokker-Plank equation with drift, diffusion and field-assisted diffusion terms. General formulae are obtained for drift mobility…
Abstract The overall isothermal crystallization kinetics for nucleated and non‐nucleated isotactic polypropylene (iPP)‐dotriacontane systems was investigated. Adipic acid was used as the nucleating agent. Half‐time was determined via differential scanning calorimetry as a function of the experimentally controlled vari…
Abstract Methyl‐3,3,3‐trifluoropropylsiloxane (F)‐dimethylsiloxane (D) random and block copolymers were prepared. The random copolymers were prepared by equilibrium copolymerization starting from a mixture of cyclic F and D siloxanes with potassium silanolate as the catalyst. The F‐D block copolymer was prepared by se…
Abstract Non‐isothermal crystallization growth rates of nucleated and non‐nucleated isotactic polypropylene (iPP) in dotriacontane were determined experimentally by thermal optical microscopy. Adipic acid was used as the nucleating agent. The non‐isothermal growth rates of the nucleated and non‐nucleated systems were…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSolid-state cathode materials for lithium batteries: effect of synthesis temperature on the physical and electrochemical properties of silver vanadium oxideRandolph A. Leising and Esther Sans TakeuchiCite this: Chem. Mater. 1993, 5, 5, 738–742Publication Date (Print):May 1, 1993…
Charge substitutions generated by site-directed mutagenesis at the termini of adjacent anti-parallel alpha-helices in a four-helix bundle protein were used to determine a precise value for the contribution of indirect charge-charge interactions to overall protein stability, and to simulate the electrostatic effects of…
We have measured the inelastic electron scattering spectra of a variety of Si and SiO2 thin films from the fundamental absorption threshold to well above the L-shell thresholds. We have used Kramers–Kronig analyses and sum rules to obtain the dielectric and optical response functions. We compare the optical properties…
We study a system of hard spherocylinders in contact with a hard wall, assuming that the length-to-width ratio of the spherocylinder tends to infinity. The Onsager approximation is applied to calculate the free energy of the system. The integral equation for the one-particle distribution function is solved in the unia…
Recent research into using offline and online diagnostics to study ageing of generator insulation is discussed. Preventive maintenance based on offline diagnostic methods and adequate updating of windings are reviewed. A few examples of online partial discharge measurements and sensor designs of and concepts under dev…
An improved algorithm is described for automated structure-factor refinement using convergent-beam electron diffraction patterns. In addition to refinement of structure factors, absorption coefficients and sample thickness, the new algorithm includes beam-direction refinement, the inclusion of weak-beam effects using…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction of electronically excited copper(II)-porphyrin with oligo- and polynucleotides: exciplex building process by photoinitiated axial ligation of porphyrin to thymine and uracil residuesPeter Mojzes, Laurent Chinsky, and Pierre Yves TurpinCite this: J. Phys. Chem. 19…
A Herzberg–Teller expansion for π electrons in the ground state of conjugated polymers identifies quadratic electron–phonon (e–ph) contributions and suggests a σ+π reference force field F0 based on butadiene. Linear response theory then fixes linear e–ph coupling constants for the Raman shifts in polyacetylene (PA) du…
Using an iterative method modernized with the adaptive subadjustment, we calculated phase functions of the focusators into a longitudinal axial line-segment, which is characterized by the constant light intensity along the line. Numerical studies were performed of a focal area: a character of variations of both the tr…
Abstract In situ surface enhanced Raman spectra (SERS) of adsorbed oxygen were obtained during oxygen adsorption and ethylene epoxidation on Ag catalyst surfaces at temperatures between 25 and 400 °C and atmospheric total pressure. Three types of Ag catalysts were investigated: (I) Ag supported on a ‐Al 2 O 3 , (II) A…