Materials Literature
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Linear birefringence, Raman scattering, dielectric, and second-harmonic generation (SHG) studies on Sr1-xCax TiO3, x=0.007, reveal a smeared transition into a ferroelectric-improper ferroelastic phase at Tc=18 K. Polar disorder persists on a nanometric scale as a consequence of the percolative nature of the transition…
BaAl2Ge2O8-feldspar (BAGF) undergoes an order/disorder phase transition (C2/m⟷I2/c) with Ttr=1690 K. The kinetic behaviour and equilibrium properties of Al, Ge cation ordering within a tetrahedral framework have been studied by isothermal annealing experiments in the temperature range between 0.5 and 0.9 Ttr., The evo…
Corrosion has always been one of the major problems in oil refineries. Although crude oils consist predominantly of non-corrosive hydrocarbons, they contain varying amounts of potentially-corrosive impurities. In addition, refinery processes use chemicals known to be corrosive. In this article, corrosion problems in a…
A new multinary, single phase (carbo-)nitride ceramic with outstanding properties has been developed. The "single-source" precursor Cl3Si-NH-BCl2 reacts with alkylamines to form a precerameric polymer which can be a liquid or a fusible or infusible solid depending on reaction conditions. Polymer pyrolysis in ammonia o…
True 3‐D garment design (CAD) systems are fundamental for the next generation of intelligent textile and garment manufacture and retailing. Reports a new approach for modelling fabric. The fabric model is developed based on a physical analogue to a deep shell system for describing and predicting the real 3‐D shape of…
Nonlinear, quasi-static finite-element calculations are performed for multilayered, electrostrictive, ceramic actuators. Both a stand-alone device and an array of devices embedded in a 2-2 composite are studied. The numerical model is based on a fully coupled constitutive law for electrostriction which uses strain and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDelocalized Nitrogen Carbanions in SRN1 ReactionsM. Chahma, C. Combellas, and A. ThiebaultCite this: J. Org. Chem. 1995, 60, 24, 8015–8022Publication Date (Print):December 1, 1995Publication History Published online1 May 2002Published inissue 1 December 1995https://pubs.acs.…
Synopsis Factors affecting the cantilever bending of human hair have been investigated by theoretical structural mechanics in which the hair was treated as if it was of isotropic structure and internal mechanical property. Despite the simplicity of the model it is a valuable one for assessing the major geometric facto…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBrush Formation by Symmetric and by Highly Asymmetric Diblock Copolymers at Homopolymer InterfacesAndrzej Budkowski, Jacob Klein, and Lewis J. FettersCite this: Macromolecules 1995, 28, 25, 8571–8578Publication Date (Print):December 1, 1995Publication History Published onlin…
Abstract Dehydration and rehydration of a phlogopitic Ca-vermiculite were studied by thermoanalysis (TG, DSC) and by in situ X-ray powder diffractometry. A detailed analysis of the relationship between temperature and state of hydration of the vermiculite close to equilibrium at atmospheric pressure was rendered possi…
We investigate the structure and chemical composition of silk proteins produced by silkworms reared entirely on an artificial (A) diet, and compared those with worms entirely on a mulberry leaf ( M ) diet. The artificial diet has tofu-cake as its main component. Two types of cocoons (A and M) are used as sample materi…
In applying catalysis to real combustor applications the modeling of transport and chemistry interactions can be key to understanding combustion characteristics. For example the effect of boundary-layer flow and heterogeneous /homogeneous chemistry can determine product selectivity for catalytically promoted oxidation…
The synthesis of a novel phthalocyanine mesogen, containing four flexible side chains terminated with a bulky trityl moiety, is described. This compound forms a well defined anisotropic glass, indefinitely stable at room temperature, in which the hexagonal ordered structure of its columnar mesophase is preserved. Such…
peer reviewed
A novel oleic acid ester of the carotane sesquiterpene 14-hydroxy CAF-603 was isolated from Trichoderma virens grown in a solid brown rice-based medium, a solid millet-based medium, or a mannitol-based liquid medium. Its structure was determined on the basis of ms and nmr analysis. It retains distinct biological activ…
A brief description of the basic optical and electro-optical effects observed in polymer-dispersed liquid crystals (PDLCs) is presented. Theoretical models of light scattering from such structures and measurement techniques of PDLC optical properties are included, based on which of the material properties of polymer a…
Positional information along the dorsal-ventral axis of the Drosophila embryo is acquired through a signal transduction pathway which employs a extracellular protease cascade. The sequential activation of serine protease zymogens results in the ventrally localized production of a ligand in the perivitelline space of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of Highly Stable Heterodimers in Aqueous Solution Between .beta.-Cyclodextrin Derivatives Bearing Multiple Opposite ChargesBertrand Hamelin, Ludovic Jullien, Frederique Guillo, Jean-Marie Lehn, Alain Jardy, Laurence De Robertis, and Hugues DriguezCite this: J. Phys…
A random-walk approach is developed for tracer diffusion by a point-defect mechanism in grain boundaries with a periodic structure. Such boundaries are characterized by a finite spectrum of possible atomic jumps. The effective (macroscopically measured) diffusion coefficient is expressed in terms of the different jump…
We measured the third-harmonic spectrum for each of four squaraine dyes in chloroform. By fitting the experimental dispersion of the third-order susceptibility, γ, to a four-level sum-over-states model, we determine the strength and the location of the lowest-lying two-photon-like transition. In each case, we find tha…