Materials Literature
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The total cold reduction and reduction per pass used during the drawing of fine wires affected the mechanical properties of two beta-titanium alloys. Both Ti-11.5Mo-6Zr-4.5Sn and Ti-13V-11Cr-3Al showed increased yield strengths and low moduli of elasticity, which resulted in wires appropriate for orthodontic applicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray diffraction analysis of airborne particulates collected by an Andersen sampler. Compound distribution vs. particle sizeTsutomu. Fukasawa, Masaaki. Iwatsuki, and Sujith P. TillekeratneCite this: Environ. Sci. Technol. 1983, 17, 10, 596–602Publication Date (Print):Octobe…
The results of a detailed analysis of the long-term and high-temperature oxidation behaviour of Zircaloy-4 in steam (600-1600 deg. C) may be summarized as follows: During an introductory phase of ''normal'' oxidation up to about 30 min, an adherent oxide layer was formed. More specifically: a cubic rate law governed t…
A Monte Carlo simulation of polymer crystal growth from the melt is presented. This two-dimensional model approximates growth by laying down crystal stems one at a time. The Monte Carlo simulation of various geometric models of the crystal surface yields Regime I and Regime II growth similar to that predicted by Lauri…
Technetium‐99 can be dissolved in Mg 2 TiO 4 spinels to form solid solutions with low dissolution rates. These materials are possible host phases for 9 9Tc in ceramic nuclear waste forms .
The existing theoretical cross section data for the charge exchange process of multiply charged fully stripped ions with hydrogen atoms are evaluated in the energy range from ∼10 eV/u to ∼103 keV/u. The evaluation has been performed on the basis of both pure theoretical arguments and comparison with the most accurate…
Abstract We report a melt spinning and viscosity study of two semiflexible homopolyesters containing both rigid and flexible segments in the repeating unit. Single filaments of the polyesters formed from 4,4′‐diacetoxybiphenyl and azelaic acid (PB7) and sebacic acid (PB8), and from 4′‐hydroxyphenyl‐4‐hydroxycinnamate…
In terms of the Takayama-Lin-Liu-Maki continuum model, exact solution is constructed for a polyacetylene chain on which a soliton and a polaron coexist, using the inverse scattering method. It is found that soliton and polaron can freely pass each other without attractive or repulsive interactions, irrespective of the…
(TTF)3(BF4)2 crystallizes in the triclinic system, space group P1, a = 8.017(3), b = 8.601(1), c = 11.635(2) Å, α = 108.79(1), β = 100.96(2), γ = 99.09(2)°, Z = 1. The TTF entities are stacked in parallel columns arranged into parallel layers alternating with layers of BF4 − anions. A TTF stack is constituted of (TTF+…
Stimulated emission has been achieved in emerald, a chromium doped beryllium aluminium silicate (Be3Al2Si6O18:Cr3+) crystal over a wavelength band peaked at 684.8 nm.
The autoxidation of sulfur dioxide to sulfate in aqueous solution has been examined over the pH range 4-13 in the presence of water-soluble transition metal-4,4’,4”,4”‘-tetrasulfophthaloc anine com lexes, MTSP (where M = Fe^(II), Mn^(II),Co^(II), Ni^(II), Cu^(II), and V^(IV). Experimental rate data have been analyzed…
Photocurrent spectra of the polycrystalline, n-type WO3 film photoanodes are shown to undergo a profound transformation following aging in a photoelectrolysis cell containing an aqueous acidic electrolyte. The observed significant improvement of the photocurrent efficiency of the WO3 photoanodes is assigned to a decre…
Devitrification rates were measured for a series of vitreous silica glasses doped with trace levels of alkali metal oxide (1.6 to 57.8 molar ppm) and aluminum oxide (22 to 73.3 molar ppm). The devitrification rate varies inversely with the molar ratio of aluminum oxide to alkali metal oxide, a direct consequence of th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic susceptibility and EPR study of bis(.beta.-alaninium) tetrabromocuprate(II)Roger D. Willett, Raymond J. Wong, and Michiko NumataCite this: Inorg. Chem. 1983, 22, 22, 3189–3194Publication Date (Print):October 1, 1983Publication History Published online1 May 2002Publi…
Abstract The rheological and thermal properties of composites of polystyrene (PS) and two liquid crystalline low‐molecular‐weight additives have been studied. Both additives act as plasticizers as evidenced by decreases in the glass transition and the melt viscosity. In addition both are miscible with PS over a broad…
Abstract Phase diagrams of two types of rigid rod polymer/flexible coil polymer/methanesulfonic acid (MSA) ternary systems were determined by polarized optical microscopy at ambient conditions. The rigid rod polymer is a wholly aromatic high temperature resistant (no measurable T g ) poly ( p ‐phenylenebenzobisthiazol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStepwise assembly of heterometallic M4S4 clusters. The structure of bis[(methylcyclopentadienyl)vanadium] bis(nitrosyliron) sulfide [(MeCp)2V2Fe2(NO)2S4], a 58e cubaneThomas B. Rauchfuss, Timothy D. Weatherill, Scott R. Wilson, and Jeffery P. ZebrowskiCite this: J. Am. Chem.…
Bacillus subtilis glucose dehydrogenase (EC 1.1.1.47) has been purified from sporulating cell extract to apparent homogeneity (as determined by polyacrylamide gel electrophoresis, sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and isoelectric focusing). The enzyme purified as a single molecular species wit…
Anisotropic refinements in space group I2/m using 1150-1200 reflections resulted in R factors ranging from 0.034 to 0.063. Over the temperature intervals studied, the tetrahedral distances remain statistically identical, but all other mean polyhedral distances increase significantly. Differential polyhedral expansion…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermogravimetric determination of the coking kinetics of Arab heavy vacuum residuumRobert C. SchuckerCite this: Ind. Eng. Chem. Process Des. Dev. 1983, 22, 4, 615–619Publication Date (Print):October 1, 1983Publication History Published online1 May 2002Published inissue 1 Oc…