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Abstract The crystallization of octacalcium phosphate (OCP) and dicalcium phosphate dihydrate (DCPD) have been studied at ambient temperature in silica gel using double diffusion system. The first stage of evolution of the OCP spherulites as well as their growth have been observed by optical microscopy. The growth rat…
Compositionally modulated TbFe and TbFeCo amorphous films were prepared on glass substrates by the bias-modulated sputtering method. The modulated structure was confirmed for modulation lengths larger than 14 Å by X-ray small angle diffraction. Sharp layer boundaries were clearly observed using cross-sectional TEM. Th…
A phenomenological model for the dielectric anomaly at the incommensurate-ferroelectric phase transition in [N(CH3)4]2XCl4 (X=Co, Zn) is presented. A first order transition between the incommensurate phase (in a sinusoidal regime) and the ferroelectric phase is assumed. A divergency of the dielectric susceptibility of…
Radiation enhanced sublimation (RES) of graphite leads to potentially high erosion rates in advanced fusion devices (Compact Ignition Tokamak, CIT) and (the International Thermonuclear Experimental Reactor ITER) and may be important in the ‘‘carbon blooms’’ observed in Tokamak Fusion Test Reactor (TFTR) and the Joint…
Abstract 1,2‐Bis( p ‐aminophenyl)tetramethyldisilane was synthesized from 1,2‐dichlorotetramethyldisilane and 4‐[ N,N ‐bis(trimethylsilyl)amino]phenyllithium. The diamine was reacted with various aromatic diacid chlorides giving disilane‐containing aromatic polyamides (aramids), whose inherent viscosities were between…
The crystallization behavior of amorphous CdGe x As 2 , where the x values were varied from 0 to 1.2, was studied in order to document the effect of germanium on the amorphous structure. The glass‐forming tendency of amorphous CdGe x As 2 was evaluated by Hruby's criterion. The crystallization mechanism of each group…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation A. S. Glass, V. M. Bermudez; Infrared study of high pressure and high temperature coadsorption of…
The kinetics of polymerization of racemic and optically active mandelic acid were determined under a variety of conditions. The initial rate of monomer consumption in the reaction with racemic mandelic acid was approximately twice that for the single enantiomer for acid-catalyzed reactions in benzene solution. A signi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of 2-(2-hydroxyphenyl)-2H-benzotriazole monomers and studies of the surface photostabilization of the related copolymersF. A. Bottino, G. Di Pasquale, A. Pollicino, Antonino Recca, and D. T. ClarkCite this: Macromolecules 1990, 23, 10, 2662–2666Publication Date (Pr…
The combination of some additions and substitutions to sintered Nd-Fe-B magnets was investigated in order to obtain high coercivity and good thermal stability. Some additions (Al,Ga,Nb,W) and a substitution (Dy for Nd) give Nd-Fe-B-based sintered magnets high coercivities without a large remanence loss. Small differen…
The morphology, systematics and ecology of a new centric diatom—CycZotelZa cretica, from Lake Kournas in the island of Crete, Greece—are reported. The morphological variation and ultrastructure of the diatom are described as revealed by light and scanning electron microscopy. The species is characterised by a smooth f…
The Zr - free fluoride glass termed BIZYbT and based on the combination of Baryum, Indium, Zinc, Ytterbium and Thorium fluorides hasbeen optimized in orderto decrease thecriticalcoolingrate and make this glass suitablefor fiberdrawing. The lowest value of 5°C/mn has been obtained and is comparable to the classical ZBL…
Abstract Poly(2‐hydro‐2‐oxo‐1,3,2‐dioxaphosphorinane) was quantitatively chlorinated, and the resulting polymer was reacted with excess of imidazole, giving the highly reactive polyesteramide. This polymer, treated with N 1 ‐hydroxyethyluracil, gave polyphosphates with N 1 ‐oxoethyleneuracil in the side chains. The fi…
Abstract The progression of squamation and the formation of ctenii in developing juveniles of completely ambicolorate specimens of the Japanese flounder, Paralichthys olivaceus (Temmink et Schlegel), have been examined and compared with those of normally colored fish. The squamation developed with a similar pattern on…
Abstract Differential scanning calorimetry (DSC) has been utilized in several studies on polymerization kinetics, at different heating rates. However, there are several factors affecting the precision of kinetic parameters. In this work, the activation energy of urethane‐bond formation between 2,6‐tolylene diisocyanat…
A novel method of single-crystal growth from the melt is proposed. Single crystals are grown by directional solidification in vertical bottom-seeded crucibles. The heat is supplied to the melt by an axial submerged heater located close to the growth interface. The crucible is insulated radially. The portion of the mel…
Acoustic damping in polymers is shown to be dominated by the glass transition occurring in the amorphous portions of the polymer. Thus to tailor damping characteristics for a particular application requires an understanding of the relation between chemical composition and glass transition temperature. Glass transition…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of bromine doping on the electrical conductivity of carbonized poly(vinylidene chloride)Junichi. Ozaki, Iwao. Sunami, and Yoshiyuki. NishiyamaCite this: J. Phys. Chem. 1990, 94, 9, 3839–3843Publication Date (Print):May 1, 1990Publication History Published online1 M…
The susceptibility of Nd-Fe-B magnet powders to oxidation and corrosion is well known and presents problems in processing and in service. Although the oxidation of Nd-Fe-B magnet powders can lead to severe irreversible losses, such losses can be stemmed by the application of antidegradation coatings. The effects of ox…
Abstract Surface‐enhanced Raman scattering (SERS) was observed from thin films formed by 1,4‐ and 1,3‐dinitrobenzene (DNB) spin‐coated onto silver island films from dilute solutions. During laser irradiation of 1,4‐DNB films on silver substrates at relatively high laser powers, new bands appeared near 1152, 1350, 1412…