Materials Literature
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The problem of dislocations emitted from a semi-infinite crack in mode II or III loading and blocked by a penetrable barrier (grain boundary), or many such equally spaced barriers, is studied. Analytical solutions for the continuous distribution of dislocations between the crack tip and a barrier is obtained. The case…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMatrix IR spectrum and ab initio SCF calculations of molecular silicon disulfideHansgeorg Schnoeckel and Ralf KoeppeCite this: J. Am. Chem. Soc. 1989, 111, 13, 4583–4586Publication Date (Print):June 1, 1989Publication History Published online1 May 2002Published inissue 1 Jun…
The thermal expansion of five cubic zirconias of different yttria content were determined using high-temperature X-ray diffraction. Yttria content was found to have no significant effect on thermal expansion.
Measurement errors often lead to large uncertainties in parameter estimation for dynamical systems. However, a considerable improvement of the preciseness may be obtained by a suitable choice of the experimental conditions. An approach is given to calculate optimal input functions by solving a minimization problem, ba…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the bis(2,9-dimethyl-1,10-phenanthroline)copper(I/II) self exchange reaction in solutionHideo Doine, Yoshiko Yano, and Thomas W. SwaddleCite this: Inorg. Chem. 1989, 28, 12, 2319–2322Publication Date (Print):June 1, 1989Publication History Published online1 May 2…
Lead zirconate (PbZrO3) is an antiferroelectric material melting at about 12507deg;C and having the Curie temperature of 230°C.1 The free energy of the antiferroelectric orthorhombic phase is very close to that of a ferroelectric rhombohedra1 especially near the Curie point.1 An evidence of the existence of a stable f…
The 0–3 piezoelectric composites were prepared using a dielectric gel with 70 vol% of coprecipitated PbTiO 3 powders with sizes of 12 to 1100 nm. Composites were cured at 80°C for 10 h and poled with E = 0 to 100 kV /cm for 0 to 15 min at 85°C. X‐ray diffraction patterns taken on the surface of the composites before a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical and spectral characterization of copper, zinc, and vanadyl meso-tetrakis(1-methylpyridinium-4-yl)porphyrin complexes in dimethylformamideK. M. Kadish, C. Araullo, G. B. Maiya, D. Sazou, J. M. Barbe, and R. GuilardCite this: Inorg. Chem. 1989, 28, 13, 2528–253…
A general algorithm for solving first-order compartmental models including recycling systems has been developed and its implementation on a microcomputer is described. Matrix algebra is used to obtain for any compartmental model an analytical solution, which is expressed as the exponential of a matrix of rate constant…
Abstract A new model of molecular scale microcapsule named “super microcapsule” (SMC) obtained from a star copolymer consisting of hydrophilic and hydrophobic blocks was presented. As a first stage, 3 and 4‐arm star polyethylene oxide‐polylactide copolymers ( s ‐PEO‐PLA) were synthesized by the use of triethanolamine…
Structure d'hydroxyapatites obtenus a 1173 K par reaction a l'etat solide pour differentes concentrations en Pb substituant Ca (20, 45, 80% d'atomes Pb). Les atomes Pb preferent les sites (2) de la structure apatite
Abstract Analysis of the crystallization kinetics of poly(etheretherketone) (PEEK) was achieved with dynamic differential scanning calorimetry results. A new kinetic model for the nonisothermal crystallization was derived and the possibility of its application was investigated. By evaluating the parameters in the mode…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, and bonding of mononuclear aryloxide derivatives of niobium in oxidation states +5, +3, +2, and +1Timothy W. Coffindaffer, Bryan D. Steffy, Ian P. Rothwell, Kirsten Folting, John C. Huffman, and William E. StreibCite this: J. Am. Chem. Soc. 1989, 111, 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreresonance Raman studies of metal-to-ligand charge transfer in (NH3)4Ru(2,2'-bipyridine)2+. In situ bond length changes, force constants, and reorganization energiesStephen K. Doorn and Joseph T. HuppCite this: J. Am. Chem. Soc. 1989, 111, 13, 4704–4712Publication Date (Pr…
The discovery of ferroelectric liquid crystals (1974) together with the subsequent discovery of the surface-stabilized liquid crystals (1980) have enriched the family of ferroelectrics with a new, different and powerful member. At the same time it has considerably raised the performance level of liquid crystals as gen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplex formation in polymer-ion solutions. 2. Polyelectrolyte effectsE. Pezron, Ludwik Leibler, and F. LafumaCite this: Macromolecules 1989, 22, 6, 2656–2662Publication Date (Print):June 1, 1989Publication History Published online1 May 2002Published inissue 1 June 1989https…
SUMMARY The immiscible liquid displacement method was used to displace soil solutions from a variety of Oxfordshire soils. These included grassland, arable, and woodland soils. The results of detailed chemical analyses demonstrated that for most solutes there were significant seasonal differences as well as difference…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActive site model of urease: synthesis, structure, and magnetic properties of a binuclear nickel(II) complex containing a polyimidazole ligandRobert M. Buchanan, Mark S. Mashuta, Kenneth J. Oberhausen, John F. Richardson, Qiaoying Li, and David N. HendricksonCite this: J. Am…
Transformation zone shape, size, and crack‐growth‐resistance ( R ‐curve) behavior were studied in precracked and annealed single‐edge notch bend specimens of commercial‐grade ceriapartially‐stabilized zirconia polycrystals as a function of applied load. Well‐defined transformation zones with a characteristic elongated…
Many studies of calcium phosphate precipitation have been made using relaxation techniques in which the concentrations of the lattice ions are allowed to decrease as equilibrium is approached. Since the nature of the phases that form depend markedly on the solution composition, this decrease can lead to concomitant ph…