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Structural development of tellurite glasses with the addition of Li 2 O and Na 2 O has been studied using infrared, Raman, and X‐ray photoelectron spectroscopies. The increase in intensity of the peak at 755 cm −1 in the infrared spectra as compared to the peak at 620 cm −1 suggests the transformation of TeO 4 buildin…
The heat transfer rates of natural convection of molten gallium were measured under various strengths of heating rates and three coordinate directional magnetic fields. Molten gallium (Pr = 0.024) was filled in a cubic enclosure of 30 mm × 30 mm × 30 mm whose one vertical wall was uniformly heated and an opposing wall…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrokinetic analysis of diverse experimental data for ethylene hydrogenation on platinumJames E. Rekoske, Randy D. Cortright, Scott A. Goddard, Sanjay B. Sharma, and J. A. DumesicCite this: J. Phys. Chem. 1992, 96, 4, 1880–1888Publication Date (Print):February 1, 1992Public…
In situ Raman spectroscopy measurements were made during the anodic oxidation of copper in 1 M and 6 M KOH solutions. The formation of CU 2 O occurs at potentials corresponding to the first anodic voltammetric peak (A1), and a porous layer of Cu ( OH ) 2 composed of fine needle‐like crystals is formed at the second vo…
Abstract Monodisperse porous polymer particles in the size range of 10 μm in diameter were prepared via seeded emulsion polymerization. Linear polymer (polystyrene seed) or a mixture of linear polymer and solvent or nonsolvent were used as inert diluents. The pore diameters of these porous polymer particles were on th…
Stress-strain trajectories associated with pseudoelastic behavior of a Cu-19.4 Zn-13.1 Al (at. %) single crystal at room temperature have been determined experimentally. For a constant cross-head speed the trajectories and the associated hysteresis behavior are perfectly reproducible; the trajectories exhibit memory p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe hydrosodalite system Na6+x[SiAlO4]6(OH)x.cntdot.nH2O: formation, phase composition, and de- and rehydration studied by 1H, 23Na, and 29Si MAS-NMR spectroscopy in tandem with thermal analysis, x-ray diffraction, and IR spectroscopyGuenter Engelhardt, Juergen Felsche, and…
The photoisomerization of disperse red 1 (DR1) in polymethylmethacrylate thin films is demonstrated by monitoring the refractive index variations by the attenuated total reflection method. Absorption spectrum measurements give a confirmation of this phenomenon. The kinetics of photoisomerization and of thermal relaxat…
We have carried out Brillouin-scattering experiments on vitreous silica at temperatures between 50 and 300 K and pressures up to 3 GPa. Application of pressure leads to considerable changes of the acoustic absorption and the velocity of sound. In order to explain our observations, we start from the so-called ``tunneli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIpso nitration of p-tert-butylcalix[4]arenesWillem Verboom, Alex Durie, Richard J. M. Egberink, Zouhair Asfari, and David N. ReinhoudtCite this: J. Org. Chem. 1992, 57, 4, 1313–1316Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Publish…
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1. Introduction. 2. Stress and Strain in Cyclic Loading. Monotonic stress-strain curve. Stress-strain relationship in cyclic loading. Hysteresis loop. Cyclic hardening/softening curves. Cyclic stress-strain curve. 3. Cyclic Plasticity and Microstructure. Metals and simple alloys with f.c.c. structure. Metals and singl…
Electron polarimeters based on Mott scattering are extensively used in atomic and molecular, solid state, nuclear, and high-energy physics. This use stems from the increasing realization that much additional information concerning many physical processes can be obtained through spin-dependent measurements. In this rev…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible luminescence quenching of porous silicon by solventsJeffrey M. Lauerhaas, Grace M. Credo, Julie L. Heinrich, and Michael J. SailorCite this: J. Am. Chem. Soc. 1992, 114, 5, 1911–1912Publication Date (Print):February 1, 1992Publication History Published online1 May…
Abstract Two‐and one‐dimensional steady‐state isothermal mathematical models of monolith reactors for selective catalytic reduction (SCR) of NO x by NH 3 are compared for circular, square and triangular geometry, as well as for linear and Rideal kinetics. Solutions for the two‐dimensional model demonstrate that, as th…
A comprehensive tabulation of Cowan–Griffin relativistic abinitio core model potentials and valence basis sets corresponding to the Cowan–Griffin abinitio model potential method is presented. It includes those for the elements from Li (Z = 3) to La (Z = 57), the alkaline M + and alkaline earth M 2+ cations, and for th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect determination of proton positions in D-Y and H-Y zeolite samples by neutron powder diffractionMirjam Czjzek, Herve Jobic, Andrew N. Fitch, and Thomas VogtCite this: J. Phys. Chem. 1992, 96, 4, 1535–1540Publication Date (Print):February 1, 1992Publication History Publi…
Enzymes suspended in organic solvents represent a versatile system for studying the involvement of water in enzyme structure and function. Addition of less than 1% (vol/vol) water to tetrahydrofuran containing 1 M 1-propanol leads to a substantial increase in the transesterification activity of subtilisin Carlsberg (f…
Neutron diffraction has been employed to investigate the structure of trilaurin in both liquid and crystalline states. The combination of long‐wavelength (4.5 Å) neutrons and wide angular ranges of detection (∼6<2θ[ o ]<∼100) per mitted a large range of momentum transfer to be acceessed (∼0.15<Q[Å −1 ]<∼2)…
Summary Barium sulfate scale occurrence is a severe production problem in North Sea oil operations. Barium sulfate is often accompanied by strontium sulfate to form a completely mixed scale called (Ba, Sr)SO4 solid solution. This paper describes a laboratory study carried out at 70°C to examine (Ba, Sr)SO4 solid-solut…