Materials Literature
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Nitrogen mineralization properties of major soils in the Tokachi district of Hokkaido in northern Japan were investigated by the kinetic analytical method. Soil samples collected in spring and autumn from plots with tillage experiments consisting of a Brown Andosol (U.S. Soil Taxonomy: Typic Hapludands) and Gleyic Cum…
The annihilation characteristics of positrons in vitreous silica glasses (v-SiO 2 ) were studied by measurements of two-dimensional angular correlation of positron annihilation radiations and positron lifetime spectra. From the measurements, it was found that positrons and positronium (Ps) atoms mainly annihilate from…
Sartorite, PbAs 2 S 4 , has been examined by transmission electron microscopy. The mineral has a monoclinic (but metrically orthorhombic) subcell with a=19.62, b=7.89, c=4.19A, β=90°, and space group P2 1 /n. In addition to the strong substructure reflections, G, corresponding to this monoclinic subcell, it also exhib…
The structure of {1101} twin dislocations in Ti films evaporated on NaCl substrates at 250°C has been examined and characterized by high-resolution transmission electron microscopy. The results have revealed that a twin dislocation structure with a step height 4d(K1), where d(K1) is the spacing of the {1101} twin plan…
A comparative study of the treatment of polytetrafluoroethylene (PTFE) and poly(vinyl fluoride) (PVF) with “Tetra-Etch” has been carried out. The treatment of PTFE resulted in extensive changes in surface chemistry and topography, whereas with PVF there was no significant change in topography and the chemical changes…
Research Article| June 01, 1993 Zincian ilmenite-ecandrewsite from a pelitic schist, Death Valley, California, and the paragenesis of (Zn,Fe)TiO 3 solid solution in metamorphic rocks D. L. Whitney; D. L. Whitney Department of Geology & Geophysics, University of Calgary, Calgary, Alberta T2N IN4 Search for other works…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAtomic force microscopy of silver bromide crystals and adsorbed gelatin filmsGreg Haugstad, Wayne L. Gladfelter, Michael P. Keyes, and Elizabeth B. WebergCite this: Langmuir 1993, 9, 6, 1594–1600Publication Date (Print):June 1, 1993Publication History Published online1 May 2…
A detailed analysis of the recently proposed [Appl. Phys. Lett. 60, 3226 (1992)] method for the direct determination of the bend-to-splay bulk elastic constant ratio (K33/K11) in nematic liquid crystals is presented. K33/K11 is directly measured from the optical birefringence pattern of an escaped-radial nematic direc…
The effects of water vapor added to hydrogen plasma were investigated by measuring the relative concentrations of hydrogen atoms in the plasma and in the downstream. The added water vapor increased the concentration of hydrogen atoms in the downstream to an amount 80 times greater than that without addition of water v…
A family of perfluorinated fluids that recently has become available, called perfluoropolyethers, contain oxygen in addition to fluorine and carbon and are potentially interesting as electrical insulating fluids. A study of their behavior under electrical pulse conditions is reported. Under the prevailing nonuniform f…
Abstract The purpose of this investigation was to examine the effects of thermal history during cooling from the melt on the degree of crystallinity, morphology, and mechanical properties of polyphenylenesulfide (PPS)/carbon fiber composites. Three thermal treatments were employed in this tudy: isothermal crystallizat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA theoretical investigation of the mechanisms of fracture in metals and alloysM. E. Eberhart, D. P. Clougherty, and J. M. MacLarenCite this: J. Am. Chem. Soc. 1993, 115, 13, 5762–5767Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymeric organosilicon systems. 15. Thermal- and radical-induced polymerization of 1,2,5,6-tetrasilacycloocta-3,7-diynesMitsuo Ishikawa, Tomoyuki Horio, Takanori Hatano, and Atsutaka KunaiCite this: Organometallics 1993, 12, 6, 2078–2084Publication Date (Print):June 1, 1993…
The durability properties of bonded lap shear joints made from an epoxy/dicyandiamide adhesive and hot-dipped galvanized (G2F) or electroplated-phosphated (EZ2) steel have been investigated. The degradation mechanisms have been studied after three accelerated ageing tests: the “cataplasme humide” (“C.H.T.”), immersion…
The molecular dynamic simulation technique was used to model the vibrational behavior of crystalline (α and β cristobalite) and amorphous silica structures. To this end a refined potential function was developed, which allows one to reproduce the correct structural geometries, the corresponding infrared spectra, and t…
A porous, luminescent surface is produced on n‐Si by irradiation in anhydrous or aqueous hydrogen fluoride without an externally applied potential. The photoluminescence spectra of the resulting surfaces are similar to those obtained by the anodization method. A porous surface is only produced when electrical contact…
The crystallography and microstructure of an antiferroelectric ceramic of approximate composition Pb0.97La0.02(Zr0.65Sn0.25Ti0.10)O3 have been examined. Transmission electron microscopy (TEM), x-ray, and neutron powder studies were carried out. The cell is metrically tetragonal with a c/a ratio of 0.993 when indexed t…
The ternary Al-Cu-Co phase diagram was studied in order to revise the region of 50–75 at.% Al. The study was carried out by optical microscopy, scanning electron microscopy, transmission electron microscopy and powder X-ray diffraction. Isothermal 800°C, 600°C and 540°C sections are presented. The development of the c…
The preparation and solid-state characterization of the bifunctional radicals [4,4’-(5-cyanobenzene)-1,3-bis(1,2,3,5-dithiadiazolyl)] and [4,4’-(5-cyanobenzene)-1,3-bis( 1,2,3,5-diselenadiazolyl)] [5-CN-1,3-C6H3(CN2E2)2] (E = S, Se) are described. The crystals of the two title compounds are isomorphous and belong to t…
The band structure of hexagonal boron nitride (BN) has been calculated using an ab initio linear combination of pseudoatomic-orbitals method. The calculated band structure confirms a previous finding that this material is an indirect band-gap insulator and has two empty interlayer bands. Projected densities of states…