Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared, magnetic, Moessbauer, and structural characterization of perrhenato(tetraphenylporphyrinato)iron.cntdot.tolueneLaNelle Ohlhausen, David Cockrum, Jay Register, Kent Roberts, Gary J. Long, Gregory L. Powell, and Bennett B. HutchinsonCite this: Inorg. Chem. 1990, 29,…
The effect of shear stress on three ⅓〈1 123〉 dislocations on {1011} planes in h.c.p. crystals has been investigated by computer simulation using a truncated Lennard-Jones potential. An edge dislocation and a 30° mixed dislocation glide on the (1011) plane relatively easily. Three types of 105° dislocations are differe…
Abstract This article describes anion transfer across a conducting polypyrrole membrane (PPM) using cyclic voltammetry with a four‐electrode system. The transfer process of both chloride and nitrate anions across the polypyrrole membrane used to separate two pools of electrolyte solutions has been studied. A wide pote…
Abstract New hypotheses of no coalescence and no entrapment are proposed for mercury intrusion and extrusion. Pore structures are represented by a two‐dimensional lattice for bond percolation and the Rayleigh distribution function taken for the pore size distribution. Different modes of hysteresis are found with the n…
Optimization of Sirospun yam quality is an ongoing process. The compactness of the yam appears to be an important factor. In this paper, we show that for a given yam count, a lower draft produces a stronger and more even yarn.
Auger electron spectroscopy (AES) is a surface‐sensitive analytical technique that derives from the interaction of an electron beam and atoms in residence at the surface of a sample; inner shell ionizations produce Auger electrons, which have an escape depth of only a few tens of angstroms. This technique has numerous…
Summary Acid-soluble magnesia cement (MC) was used in production zones to plug perforations temporarily to reduce brine losses during completion and workover operations. This has resulted in substantial savings for operators. The cement has also been used to reduce potential formation damage. This paper describes some…
Individuals living near the Nevada Test Site were exposed to both beta and gamma radiations from fission products and activation products resulting from the atmospheric testing of nuclear devices. These exposures, and the resultant doses, were functions of the amount of material deposited, the time of arrival of the d…
Increased usage of thermoplastic materials in electronic apparatus has accentuated electromagnetic interference (EMI) problems. Methods for providing shielding by metallizing the thermoplastics using electroconductive paints and electroconductive thermoplastic molding compounds are examined, following a review of the…
The speed of motion has been studied for the first time in more than 110 raphid species, sampled in their natural environment and representing about 25 % of fresh water species from the west of France. First, five species were chosen belonging to 5 different genera in order to test the general conditions governing acc…
The opening behavior of lockstitch seams (seam type 1.01.01, SSa-1, stitch type 301 ) under cyclic loading conditions has been analyzed, using models of the slippage of yarns in the fabric and the deformation of the stitch itself. The extension properties of the sewing thread under constant cyclic loading conditions w…
Novel liquid crystalline 1,3-disubstituted cyclopentanes were studied for physicochemical and temperature characteristics.
Abstract We have used XPS to examine some model catalysts obtained by vapour deposition of Ni, Pd and Pt on an α‐alumina single‐crystal. It is shown that the binding energies of the substrate core levels with respect to the metal Fermi level depend on the metal work function. This is due to the fact that the common re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe synthesis and characterization of magnetic iron-modified polyimide filmsJ. J. Bergmeister, J. D. Rancourt, and L. T. TaylorCite this: Chem. Mater. 1990, 2, 6, 640–641Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue…
An algorithm is presented for computationally drafting patterns from three-dimen sional data, in which the fabric is everywhere in contact with the underlying surface. The algorithm is based on an earlier theoretical framework, which models draping a garment as a two-step process. In this part, a functional relationsh…
Composites containing 30 vol%β‐Si 3 N 4 whiskers in a Si 3 N 4 matrix were fabricated by hot‐pressing. The composites exhibited fracture toughness values between 7.6 and 8.6 MPa · m 1/2 , compared to 4.0 MPa · m 1/2 for unreinforced polycrystalline Si 3 N 4 . The improvements in fracture toughness were attributed to c…
The dielectric peaks observed at the phase transition between an incommensurate- and a commensurate-ferroelectric phase have usually been explained in terms of a soliton-regime model of the incommensurate phase. However, in the case of [N(${\mathrm{CH}}_{3}$${)}_{4}$${]}_{2}$X${\mathrm{Cl}}_{4}$ (X=Co, Zn), recent obs…
Side-chain liquid crystal polyacrylates and polysiloxanes containing different photochromic spironaphthoxazine side groups were synthesized. Thermodynamic, spectral and kinetic properties of the polymers were investigated. The structure of the mesophase is discussed.
This volume gathers the contributions of six world experts to a course on combustion modelling. Therefore, a pedagogical effort has been made in writing up these texts, which cover state of the art advances in most aspects of combustion science. The book is aimed at students, researches and engineers, as was the cours…
Abstract An isoporphyrin prepared by the action of dibenzoyl peroxide on 5,10,15,20-tetraphenylporphinatozinc(II) (ZnTPP) shows absorption bands in the near-infrared region, is photolyzed to afford ZnTPP, and is facilely reduced by amines to ZnTPP.