Materials Literature
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Two allotropic forms of zirconium oxide, monoclinic and tetragonal, have been identified in the scales formed on zirconium alloys. The transition from tetragonal to monoclinic has been followed by X-ray measurements and Raman laser spectroscopy. Information on the average content of the tetragonal phase was obtained b…
Hydrogen-induced loss increases are known to occur in optical fibers, due both to the presence of molecular H<sub>2</sub> and to the reaction of hydrogen with defects in the fibers. To predict the long-term loss increases expected for fibers under normal conditions, it is necessary to rely on accelerated aging experim…
Ferroresonance can occur in power transformers or reactors fed through capacitive coupling from neighbouring phases or lines. Ritz's method of harmonic balance is used to formulate an analytical solution to the problem of fundamental frequency ferroresonance. A two-term polynomial of order 11 is used to accuratel…
Textiles as clothing material must fit the human body and senses. This fitting is an important performance of the textiles besides the utility performance of textiles such as fabric strength. For many years, the performance concerning this fitness has been evaluated subjectively by hand judgement. The fabric property…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox-switched molecular aggregates: the first example of vesicle formation from hydrophobic ferrocene derivativesJulio C. Medina, Isabelle Gay, Zhihong Chen, Luis Echegoyen, and George W. GokelCite this: J. Am. Chem. Soc. 1991, 113, 1, 365–366Publication Date (Print):Januar…
A wide range of ceramic coatings has been deposited on metal substrates by a reaction occurring during dielectric breakdown at the anode surface in an electrochemical cell, which is accompanied by visible sparking at the anode/electrolyte interface. While the majority of work reported has been on oxide coatings deposi…
Recent developments in instrumentation for electron energy loss spectroscopy (EELS) at Gatan R&D are reviewed. A 10-channel intrinsic Si detector with single-electron detection capa- bility is being developed for fast energy-filtered imaging and elemental mapping in the STEM mode. A new type of an imaging filter…
Interferometric measurements of saturation of the nonlinear index of refraction in a semiconductor-doped glass (Schott OG 550) are reported. The index change, measured at a wavelength of 532 nm, reaches a maximum value of ~1.5 × 10−4 at high intensity. It is shown that the magnitude of the corresponding third-order su…
Simulataneous additions of SrO and Al 2 O 3 to ZrO 2 (12 mol% CeO 2 ) lead to the in situ formation of strontium aluminate (SrO · 6Al 2 O 3 ) platelets (∼0.5 μm in width and 5 to 10 μm in length) within the Ce‐TZP matrix. These platelet‐containing Ce‐TZP ceramics have the strength (500 to 700 MPa) and hardness (13 to…
The mechanical properties of wood flour/polypropylene composites may be improved by using coupling agents to enhance the bonding between filler and matrix. We used a two-level, full-factorial experiment to examine the effectiveness of a commercially available additive, Epolene E-43, on strength (tensile, flexural, and…
Many of the problems associated with conventional drug therapy may be circumvented by the use of delivery systems which, in a variety of ways, will optimize drug action. Among the systems being investigated, liposomes hold considerable promise. Versatility in both the structural characteristics of liposomes and their…
Abstract
Hydrogen permeation characteristics of palladium-plated vanadium and vanadium-nickel alloy membranes have been investigated using gas permeation technique in the temperature range 423–673 K and in the hydrogen pressure range 1×104−3×105 Pa. Hydrogen solubilities of vanadium-nickel alloys have been determined using a v…
The crystallization kinetics of a 40Li 2 O · 60SiO 2 (mol%) glass were studied using DTA and both isothermal and nonisothermal DSC techniques as a function of (1) particle size of the glass powder, (2) crucible material, e.g., alumina or platinum, (3) furnace atmosphere, e.g., nitrogen, oxygen, or argon, and (4) surfa…
A new model of the geometrical structure of icosahedral quasicrystals is discussed that is based on icosahedral clusters connected by linkages (consistent with currently accepted motifs of the atomic structure), yet that is also a tiling by four kinds of ``canonical cells.'' Such a geometry is convenient for complete…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman spectroscopy of peptides: preferential N-terminal adsorption on colloidal silverTonya M. Herne, Angela Ahern, and Robin L. GarrellCite this: J. Am. Chem. Soc. 1991, 113, 3, 846–854Publication Date (Print):January 1, 1991Publication History Published on…
The interaction of the mono- and triglutamate forms of 5-methyltetrahydrofolate and 5-formyltetrahydrofolate with serine hydroxymethyltransferase were determined by several methods. These methods included: determining dissociation constants by observing the absorbance at 502 nm of a ternary complex of the enzyme, glyc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicroscopic and macroscopic thermodynamic observations in swollen poly(dimethylsiloxane) networksSimon Mallam, Ferenc Horkay, Anne Marie Hecht, Adrian R. Rennie, and Erik GeisslerCite this: Macromolecules 1991, 24, 2, 543–548Publication Date (Print):January 1, 1991Publicatio…
The 12-molybdo(tungsto)phosphoric acids, and the related compounds 1-vanado-11-molybdo(tungsto)phosphoric acids, all having the Keggin structure, have been studied at different temperatures in a special infrared cell allowing experiments in a controlled atmosphere. The effects of dehydration and the thermal stability…
The colloidal fibrils of polyaniline–poly(acrylic acid) complex were first synthesized by template guided chemical polymerization; their morphology and the electronic absorption spectra in aqueous solution are reported.