Materials Literature
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Square holes observed in the walls of the pennate diatoms may be due to cubic crystals inside the silicalemma that interfere with silica deposition, or cause its dissolution shortly after deposition. Their presence is consistent with models of valve morphogenesis by diffusion limited precipitation of amorphous silica…
(1990). Liposomes In Vivo: Prospects for Liposome-Based Pharmaceuticals in the 1990s. Biotechnology and Genetic Engineering Reviews: Vol. 8, No. 1, pp. 279-318.
Special attention is paid to the basic developments of the theory, the controversial «second frequency spectrum» of Timoshenko beams, cases of non-uniform cross section, presence of rigid masses, realistic end constraints, computer-oriented solutions, dynamic stability situations, and presence of elastic foundations
The strain dependence of tensile and compressive elastic moduli in carbon fibre/epoxy resin unidirectional and multidirectional composites is presented. Examined composites were made from prepregs supplied by two producers. Values of relative varia tions of modulus with unit strain are given. All of the examined compo…
Frustules of Mastogloia smithii from the Rabenhorst collection were studied in light and scanning electron microscopy. The valvocopula is composed of three elements: the band-like pars exterior, the septum, and the partectal ring, which contains a porous intrapartectal cylinder similar to that of Mastogloia grevillei…
The Sgs-3 gene of Drosophila melanogaster exhibits a tightly regulated pattern of expression governed by two functionally equivalent elements within 1 kb of the gene, each of which is sufficient to confer third-instar salivary gland-specific transcription. In this report we describe a detailed functional analysis of o…
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…