Materials Literature
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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…
Abstract Bis(chloro)phthalocyaninatometallate von Fe III , Ru III und Os III [MCl 2 Pc(2−)] − mit einem elektronischen low‐spin Grundzustand (S = 1/2) bilden sich bei der Umsetzung von [FeClPc(2‐)] bzw. H[MX 2 Pc(2−)] (M = Ru, Os; X = Cl, I) mit überschüssigem Chlorid in schwach koordinierenden Lösungsmitteln (DMF, TH…
Modifying the number, width, depth, and shape of the echelettes in a diffractive bifocal lens will influence the image intensity and quality within the zero, first, and higher order images. By appropriately varying these parameters optimal bifocal lens designs may be achieved.
Electrical-resistivity measurements at temperatures between 1.2 and 300 K and pressures up to 12 kbar have been used to determine that the pressure dependence of the Curie temperature ${\mathit{T}}_{\mathit{C}}$ of the ferromagnetic Heusler alloy ${\mathrm{Co}}_{2}$TiAl is -0.7 K/kbar. Analysis of the pressure depende…
Room-temperature capacitance-voltage-frequency measurements are reported for an 85-nF barium titanate high-voltage ceramic-disk nonlinear capacitor, intended for use in a power electronics turnoff snubber circuit. Bias-voltage excursions are from 0 to 1500 V DC, and the frequency responses are measured from quasi-DC t…
Abstract 1‐Alkenes are converted in high yields to the corresponding primary diorganomagnesium compounds by transition metalcatalyzed hydromagnesation reaction using catalytically prepared suspended (MgH 2 *) or dissolved magnesium hydride (MgH 2 * ). The most active hydromagnesation catalysts have been found to be co…
A SiC-on-SiO/sub 2/ waveguide structure is proposed and analyzed. The analysis shows that the planar SiC waveguide has low loss and good beam confinement in the guiding core for the fundamental mode at 1.3 mu m and 0.7 mu m. In addition, such a waveguide displays strong mode discrimination (>20 dB) between the fundame…
Beam-profile reflectometry is a new technique for measuring the thickness and optical constants of dielectric, semiconducting, and thin metal films. The technique consists of measuring the intensity profile of a highly focused beam reflected from the sample. By using a linearly polarized light source and a tightly foc…
Abstract A dispersion-centrifugation-decantation procedure was used to isolate various particle size fractions from a sample of clay (<2 µ m fraction) separated by sedimentation from the Ap horizon of a Webster soil (fine-loamy, mixed, mesic Typic Haplaquoll). The 0.02–0.06 µ m size fraction was found to be enriche…
Abstract With the exception of most PVC pressure pipe and a few profile applications where high modulus is the major consideration, most rigid and semirigid PVC compounds have impact performance requirements that can be met only through the use of impact modifiers. We present an overview of the mechanisms of impact mo…