Materials Literature
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Extended thermal annealing treatments were used to modify the B‐site cation order in the (1 − x )PMN– x PSN perovskite system (where PMN is lead magnesium niobate, Pb(Mg 1/3 Nb 2/3 )O 3 , and PSN is lead scandium niobate, Pb(Sc 1/2 Nb 1/2 )O 3 ). Extensive 1:1 ordering could be induced in compositions with x ≥ 0.1. Th…
Two-directional N2 desorption was found in N2O dissociation on Rh(110), Ir(110), and Pd(110) below 160 K by angle-resolved thermal desorption. N2O(a) is mostly dissociated during heating procedures, emitting N2(g) and leaving O(a). N2 showed four desorption peaks in the temperature range of 110–200 K. One of them comm…
The trash and color of raw cotton are very important and decisive factors in the current cotton grading system. In this paper, an image system is developed that can characterize trash from a raw cotton image captured by a color CCD camera and acquire color parameters. The number of trash particles and their content, s…
The L1/sub 0/-FePt ordered phase is formed at lower annealing temperature by addition of Cu. FePtCu films start ordering at 300/spl deg/C or a lower temperature, whereas FePt and FePtAg films are still disordered alloys after annealing at 300/spl deg/C. The results of X-ray diffraction indicate that FePt and the added…
Abstract Mono-dispersed mesoporous silica spheres with ordered hexagonal regularity were synthesized from tetramethoxysilane and dodecyltrimethylammonium bromide as a surfactant under very specific conditions. By adjusting the optimum concentrations of the reactants, silica particles with diverse morphology were obtai…
This paper reports the transport kinetics of Mg in cubic yttria‐stabilized zirconia (containing 10% mol of Y 2 O 3 (10YSZ)) involving the bulk and the grain boundary diffusion coefficients. The diffusion‐controlled concentration profiles of Mg were determined using secondary ion mass spectrometry (SIMS) in the range 1…
Abstract Significant economic benefits can be derived from reducing the variability of product properties around their specification targets in batch reactors. End‐use properties in batch reactors using dynamic models that relate the operating conditions to the end‐use properties are related through a static nonlinear…
Monte Carlo computer simulations have been performed for model polymers containing randomly distributed spherical filler particles of diameter 8 times the transverse diameter of the polymer chains. The partial volume of the filler has been varied from 10% to 50%. The polymer/filler interface is characterized by densel…
The way in which the genes involved in cysteine biosynthesis are regulated is poorly characterized in Bacillus subtilis. We showed that CysL (formerly YwfK), a LysR-type transcriptional regulator, activates the transcription of the cysJI operon, which encodes sulfite reductase. We demonstrated that a cysL mutant and a…
The conversion of a Sr–Ti bimetallic methoxyethoxide precursor into SrTiO 3 via hydrolysis and/or calcination was investigated. Hydrolysis with various water/metal molar ratios ( r H ; r H = 0.5, 2, 4, 6, 8, 10) in tetrahydrofuran at reflux resulted in a decrease in the amount of the methoxyethoxyl groups, and the hyd…
The high temperature engineering test reactor (HTTR) is a graphite-moderated and helium-gas-cooled reactor, which is the first high temperature gas-cooled reactor in Japan. The HTTR achieved its first full power of 30 MW at rated operation on December 7 in 2001. In the rise-to-power test of the HTTR, simulation test o…
A commercial grade of zircon (ZrSiO 4 ) concentrate was mechanically milled with MgO for up to 100 h in a laboratory‐scale mill. The resultant powders were subjected to thermal processing, chemical leaching, and X‐ray diffraction (XRD). There was no direct evidence of reaction during the milling step, with no new phas…
The mechanism of Cu diffusion over a clean Si(110) surface was studied by Auger electron spectroscopy and low-energy electron diffraction in the temperature range from 500 to 650°C. It is shown that the Cu transport over the Si(110) surface proceeds by Cu atom diffusion through the Si bulk and Cu atom segregation at t…
Bis-nitrosobenzene complexes of the form (por)Ru(PhNO) 2 (por = TPP, TTP; TPP = tetraphenylporphyrinato dianion, TTP = tetratolylporphyrinato dianion) have been prepared in good yields from the reaction of the (por)Ru(CO) precursor with excess PhNO in dichloromethane. The IR spectra of the complexes (as KBr pellets) d…
Abstract Direct experimental proof is presented that crosslinking of macromolecules during the thermal degradation of PVC proceeds with participation of blocks of conjugated double bonds formed upon activation by carbonylallyl groups.
Summary The behavior of rare earth elements (REE) as chemical analogues for actinides during glass corrosion was studied with static long-term batch experiments (7.5 years) at 190 °C. Corrosion tests were carried out using a simulated inactive high level waste (HLW) glass powder. Two different highly concentrated salt…
Based on the results of pH and chemographic measurements, it is shown for the first time that the oxidation of porous silicon in aqueous media is accompanied by the liberation of hydrogen in the ionic and atomic forms.
Binary tellurite glass systems of the forms TeO2(100−x)-xAnOm where AnOm = La2O3 or V2O5 and x = 5 to 20 for La2O3 and 10 to 50 for V2O5 were prepared. UV-spectra of these glasses were recorded in the range of 200–700 nm at room temperature. The optical energy gaps Eoptical and have been calculated from the optical ab…
A series of high nitrogen 0·2 wt-%C steels was melted to evaluate the effects of composition and processing on the isochronal austenite grain coarsening resistance of cold forged compression specimens during simulated carburising. Steels containing aluminium or combinations of aluminium and vanadium exhibit good grain…
Hot dipping and diffusion annealing is an alternative production process to obtain steel with high silicon contents while avoiding rolling problems. Surface alloying with Si and Al is achieved on a low-Si steel substrate (/spl ap/ 3%Si) by hot dipping in a hypereutectic Al-27%Si molten bath. To obtain a sufficient amo…