Materials Literature
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An activated carbon prepared by CO2 activation from a demineralized Spanish lignite char was oxidized by treatment with H2O2. This oxidized activated carbon was heat treated in an He flow at different temperatures up to 1273 K, and the samples so obtained were exposed to ambient air for two years. The oxygen surface c…
The conformational energy of chain fragments of poly(methylphenylsiloxane) is studied, considering contributions from bond stretching, bond angle bending, bond torsion, and van der Waals interactions. Energy is minimized without constraints, so that minima correspond to fully relaxed conformations. The energy minima o…
The effect of pressure on diffusivity in binary or multicomponent systems such as gas−liquid or gas−solid systems has rarely been reported. The diffusivity of carbon dioxide in extruded gelatinized starch has been measured in this study at pressures of up to 117 bar (1700 psi). Such data are fundamentally not only use…
We calculate higher order effects such as frequency shifts and radiation loss in grating waveguides and grating couplers. The approach follows a vector variational principle which incorporates the Floquet components correct to first order. It is unnecessary to bring radiation modes into the formalism. This yields a si…
The singly excited configuration interaction (CIS) approximation and the CNDO model Hamiltonian have been employed to calculate the optical spectra of [Cd(SPh) 4 ] 2-, [Cd 2 (SPh) 6 ] 2-, and [Cd 4 (SPh) 10 ] 2- and the artificial defect models [Cd 2 (SPh) 5 ] - and [Cd 4 (SPh) 9 ] - (Ph = phenyl). The electronic tran…
The corrosion behavior of Zircaloy-type alloys with different tin contents of 1.55, 0.70, and 0.55 wt% was studied at 350°C and 17 MPa in an environment similar to PWR primary water. For this non-interrupted test, a special autoclave system was used that was equipped with electrical feed that allowed followup on the g…
Residual stresses in Al2O3 and Si3N4-matrix nanocomposites (added with β-SiC or WC phase) have been measured by piezo-spectroscopy. The highest residual stress value was found in Al2O3-matrix materials. Machining procedures have been found to play a minor role in the formation of residual stresses. Analyses of both sp…
Variation of the reaction mechanism for homogeneous thermal decomposition of NO into N2 and O2 in the temperature range between 1000 and 4000 K is studied. The decomposition always proceeds through an atomic chain mechanism initiated by formation of oxygen atom. However the step of the oxygen atom initiation depends o…
The temperature dependence of the fracture toughness of ceramics exhibiting duplex microstructures was studied relative to their single‐phase constituents using two test methods: bend testing of chevron‐notched beams, and the indentation‐crack‐length technique. The two materials systems studied were Al 2 O 3 : c ‐ZrO…
Our recent in vivo studies have investigated the surface adsorption property of various circulating liposomes to blood proteins, and have related this property to liposome clearance behavior. In particular, we have investigated liposomes composed of different charged or neutral lipids, fatty acyl chain length and satu…
A theoretical model for the description of relaxation curves after dynamic loading is presented in this paper. The model is based on a nonlinear spring placed in parallel with Maxwell elements. The obtained formula is fitted on experimental relaxation curves using the Marquardt-algorithm for nonlinear regression. Rela…
Direct meso-alkylation of zinc(II) or metal-free 5-formyloctaethylporphyrin is achieved by use of Grignard reagents (such as MeMgBr, EtMgBr and PhCH2MgCl); regioselective attack at the 15-position of the prophyrin macrocycle is observed and affords the unexpected 5-formyl-15-alkylporphyrins by way of a phlorin interme…
Mn-Zn ferrites of composition, Mn/sub 0.57/Zn/sub 0.35/Fe/sub 2.08/O/sub 4/, have been prepared using citrate-gel and conventional mixed oxide processing routes. The magnetic properties and microstructures of these two ferrites were examined. Total power losses were measured and analyzed as a function of frequency, an…
A family of NMR solution structures of the growth factor receptor-bound protein 2 (Grb2) SH2 domain has been determined by heteronuclear multidimensional NMR. Proton, nitrogen, and carbon chemical shift assignments have been made for the SH2 domain of Grb2. Assignments were made from a combination of homonuclear two-d…
Carbon-13 nuclear magnetic resonance (13C-NMR) and 13C-enriched formaldehyde (13CH2O) were utilized to observe cross-linking in gelatin. Thus, when a 6% solution of gelatin in water was treated with 2000 ppm 13CH2O at 20 degrees C, the 15 hr 13C-NMR spectrum of the crosslinked gel showed peaks representing carbinolami…
Application of the new oxide ion conductor of composition La0.9Sr0.1Ga0.8Mg0.2O3 as electrolyte in solid oxide fuel cells is effective in enabling a decrease in the operating temperature.
Fibers of a poly(azomethine) having hydroxyl groups within the mesogenic core have been melt extruded from the nematic phase. The polymer obtained by condensation of 1,10-bis[(4-formyl-3-hydroxyphenyl)oxy]decane and 2-methyl-1,4-phenylenediamine has a T g of 54 °C and exhibits a nematic phase from 178 to 341 °C. Due t…
Abstract (Bi 1‐ x Sb x ) 2 Se 3 ( x = 0.0 to 0.2) single crystals were prepared using a modified Bridgman method. Measurements of the Hall coefficient R H , electrical conductivity σ and Seebeck coefficient α showed that incorporation of the antimony atoms into the Bi 2 Se 3 crystal lattice results in an increase in t…
Initial results of introducing La 2 O 3 into zinc titanate, a potential regenerable desulfurization sorbent, to reduce the spalling of zinc titanate and other similar type mixed metal oxide sorbents used in hot coal-derived fuel gas desulfurization are presented. Sorbents were tested in a bench scale high temperature−…
The paper describes kinetic investigations related to the development of a wet scrubbing process for SO 2 abatement from industrial waste gases: the oxidation of sulfur dioxide by tetravalent cerium in a sulfuric medium. Experiments carried out using two gas/liquid contactors and their interpretation could highlight t…