Materials Literature
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The pore surface area ( S p ) and grain‐boundary area ( S gb ) were measured during the sintering of undoped and doped (100 ppm MgO) alumina compacts. Since the presence of the additive affects only S gb (raising it at a given value of the density), pinning of the boundaries by solid‐solution drag is the only additive…
Mixtures of ultrafine monoclinic zirconia and aluminum hydroxide were prepared by adding NH 4 OH to hydrolyzed zirconia sols containing varied amounts of aluminum sulfate. The mixtures were heat‐treated at 500° to 1300°C. The relative stability of monoclinic and tetragonal ZrO 2 in these ultrafine particles was studie…
The development of the theory of shielding and antishielding of nuclear quadrupole moments is reported. The various contributions to the Sternheimer shielding and antishielding factors are discussed. Also the history of the different calculational techniques is outlined.
Abstract The effect on packing resulting from the filling of unsaturated polyester resin with fillers and jute fibers has been investigated. The influence of absorbed water on the interfacial interactions involved in the fiber matrix system of the jute reinforced polyester resin also are discussed. An approach to redu…
Abstract The synthesis and characterization of amorphous, aromatic, polyaryl ethers has been investigated. Detailed synthesis procedures are provided. The main thrust of these activities was to synthesize polymers which could serve as castable amorphous matrix resins for carbonfiber composites and which would be highl…
Four pair-wise potentials have been found to be suitable for the simulation by computer of stacking faults and dislocation core configurations in model crystals having the hexagonal-close-packed structure. The potentials define stress-free perfect crystals and have markedly different ranges and shapes, but the crystal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew cation-anion interaction motifs, electronic band structure, and electrical behavior in .beta.-(ET)2X salts [ET = bis(ethylenedithio)tetrathiafulvalene; X = dichloroiodide, chlorobromoiodide]Thomas J. Emge, Hau H. Wang, Peter C. W. Leung, Paul R. Rust, Jan D. Cook, Patric…
Glasses of composition 3ZrO 2 O · 2SiO 2 were prepared by the sol‐gel process from metal alkoxides. Tetragonal ZrO 2 was precipitated by appropriate heat treatment at 1000° to 1200°C. The fracture toughness of these glass‐ceramics increased with increasing crystallite size of the tetragonal ZrO 2 , reaching ∼5.0 MN/m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixed copper/iron clusters. The preparation and structure of the large planar cluster anions, Cu3Fe3(CO)123- and Cu5Fe4(CO)163-G. Doyle, K. A. Eriksen, and D. Van EngenCite this: J. Am. Chem. Soc. 1986, 108, 3, 445–451Publication Date (Print):February 1, 1986Publication Hist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, structure, and magnetic properties of the novel trinuclear copper(II) hydroxo complex [(AE)3Cu3OH](ClO4)2 (AEH = 7-amino-4-methyl-5-aza-3-hepten-2-one)Jean Pierre Costes, Francoise Dahan, and Jean Pierre LaurentCite this: Inorg. Chem. 1986, 25, 4…
A brief review is given for the experimental results of hydrostatic pressure effect on the lock-in transitions in various tetramethylammonium tetrahalogenometallic compounds, {N(CH3)4}2XY4 (X: Mn, Fe, Co, Ni, Cu, Zn; Y: Cl, Br). The pressure-temperature phase diagrams of the chloride compounds with X = Mn, Fe, Co, Zn…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic behavior of nonet tetracarbene as a model for one-dimensional organic ferromagnetsTadashi. Sugawara, Shunji. Bandow, Keisaku. Kimura, Hiizu. Iwamura, and Koichi. ItohCite this: J. Am. Chem. Soc. 1986, 108, 3, 368–371Publication Date (Print):February 1, 1986Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry and radiation chemistry of colloidal semiconductors. 12. Intermediates of the oxidation of extremely small particles of cadmium sulfide, zinc sulfide, and tricadmium diphosphide and size quantization effects (a pulse radiolysis study)S. Baral, A. Fojtik, H. We…
Calcic plagioclase (An69 Ab30), albite (An6 Ab94), and microcline (An2 Ab31 Or67) were leached over a 10-wk period at 13°C with 10−4M solutions of a number of low-molecular-weight organic acids. The effectiveness of the organic acids in dissolving the feldspars was found to be citric ≈ oxalic > salicylic > protocatech…
Six freshly enucleated, unfixed human eyes with choroidal melanomas were imaged on a 1.4-T superconducting magnetic resonance (MR) imaging system. Immediately thereafter the eyes were sectioned, and tumor samples were removed for study on a variable-field (0.19-1.4 T) nuclear MR spectroscopy unit. Shorter T1 and T2 re…
The metC gene of Escherichia coli K-12 was cloned and the nucleotide sequence of the metC gene and its flanking regions was determined. The translation initiation codon was identified by sequencing the NH2-terminal part of beta-cystathionase, the MetC gene product. The metC gene (1185 nucleotides) encodes a protein ha…
Summary Casing wear caused by new tooljoint hardfacings, such as fine-mesh tungsten-carbide hardfacing and a hardfacing covered with a layer of relatively soft material, has been investigated in the laboratory. The tests were performed on a full-scale test facility with field conditions—forces, motions, and fluids—sim…
Apparatus is described for study of diffuse-reflection spectra (DRS) and luminescence spectra (LS) in the wavelength range of 0.2-2.2 ..mu..m of solids in the initial state and during irradiation by light by electrons with energies up to 150 keV, and by H/sup +/, H/sub 2//sup +/, and H/sub 3//sup +/ ions with energies…
Abstract The thermal degradation of poly(vinyl bromide) (PVB), poly(vinyl chloride) (PVC), poly(vinyl alcohol) (PVA), poly(vinyl acetate) (PVAc), poly(vinyl fluoride) (PVF), poly(vinylidene chloride) (PVC 2 ), and poly(vinylidene fluoride) (PVF 2 ) has been studied by direct pyrolysis–mass spectrometry (DP‐MS) and fla…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal poly(benzodithiolenes)C. W. Dirk, M. Bousseau, P. H. Barrett, F. Moraes, F. Wudl, and A. J. HeegerCite this: Macromolecules 1986, 19, 2, 266–269Publication Date (Print):February 1, 1986Publication History Published online1 May 2002Published inissue 1 February 1986https…