Materials Literature
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The changes of electrochemical parameters on vanadium in 0.5 M NaCl solution at different potentials ranging from − 0.155 (Ecorr) to 1000 mV (SCE) are studied using the AC impedance method. It is found that the charge-transfer resistance decreases with increasing potential. At potentials ≤ 500 mV both the metal charge…
A diffusion-based numerical model was developed to predict the life of cylindrical structural elements suffering hydrogen embrittlement in the presence of residual stress fields. The formulation of the model is based on stress-assisted hydrogen diffusion from the external environment into the metallic material and on…
We report on a PE study of the electronic structure of pristine TiSe2. The experimental data are compared with results of band-structure calculations. It is confirmed that TiSe2 reveals semimetallic properties. For the first time rare-earth metals were attempted to be incorporated in situ into TiSe2. It is found that…
Effects of alloying elements on corrosion rates were investigated for 13% to 20% chromium-containing steels in wet carbon dioxide (CO2) environments without wet hydrogen sulfide (H2S) gas at 150°C to 200°C. Results showed that a reduction in carbon content and an increase in chromium, molybdenum, and nickel content im…
The deconvolution of X-ray diffraction profiles is a basic step in order to obtain reliable results on the microstructure of crystalline powder (crystallite size, lattice microstrain, etc .). A procedure for unfolding the linear integral equation h = g f involved in the kinematical theory of X-ray diffraction is propo…
Raman scattering spectra and magnetic susceptibility are measured in intercalation compounds FexNbS2 (0.159≤x≤0.325). A strong modification of Raman spectra is observed in a sample with x=0.239 (∼ 0.25) which is accompanied by 2a × 2a structural change and antiferromagnetic ordering. Some correlations between magnetic…
Electroluminescence (EL) from nanocrystalline Si (nc-Si) embedded in a single-crystal CaF 2 layer formed on a p-type Si(111) substrate has been demonstrated. Nc-Si/CaF 2 layers were grown by co-evaporation of Si and CaF 2 by molecular beam epitaxy for Si and partially ionized epitaxy for CaF 2 at a low growth temperat…
Se estudiaron cuatro Andisoles provenientes de los volcanes Hornopiren y Hualaihue o volcan Apagado, situados en Chiloe Continental, provincia de Palena, X Region (41o 53?S). Los suelos estan localizados en las faldas de los volcanes, en un relieve abrupto cubierto con una densa foresta pluvial, muy humeda, de 4.000 a…
The damage promoted on two different kinds of enamelled specimens was evaluated. One was coated with a single layer of pyrolytic electrostatic powder enamel (referred to as black enamel), and the other was coated with ground coat wet enamel (white enamel). Specimens were cyclically subjected to the action of an oven c…
Experimental solubilities are reported at 25.0°C for hexachlorobenzene dissolved in 42 different organic nonelectrolyte solvents containing ether-, chloro-, hydroxy-, ester, methyl-, and tert-butyl-functional groups. Results of these measurements are used to test the applications and limitations of expressions derived…
The direct deposition of diamond films on copper substrate has been suffered from adhesion problems due to the mismatch of the thermal expansion coefficients of diamond and copper. In this paper, nuclei with valuable density were directly introduced through a submicron diamond powder layer. The diamond grits partially…
High pressure is used to study the effects of nontetrahedral site distortions on luminescence properties of ${\mathrm{Cr}}^{4+}$ and ${\mathrm{Mn}}^{5+}$ in ${\mathrm{Y}}_{2}{\mathrm{SiO}}_{5}.$ Luminescence spectra and lifetime measurements of ${\mathrm{Mn}}^{5+}:{\mathrm{Y}}_{2}{\mathrm{SiO}}_{5}$ as a function of p…
A critical step in protecting aluminum alloys from corrosion is surface pretreatment. According to ASTM D-1730, many combinations of acid, alkaline, or solvent cleanings may be used and regarded as acceptable methods for pretreatment of aluminum alloys before painting. Flexibility in controlling the steps in the stand…
Previous experimental evidence has suggested the existence of a transient planar state during the transition from a homeotropic state to a focal conic state. This does not appear at first to be physically reasonable. Here we show a quantitative numerical model of this transition that shows the existence of the transie…
A solvent-free method for the hydrosilylation of pendant double bonds in block copolymers is reported in this article. An anionically prepared block copolymer, poly(styrene-b-1,2-butadiene), was heated with 1H,1H,2H,2H-perfluorooctyldimethylhydrosilane in the presence of a nonacidic platinum catalyst for 24–26 h to ob…
Ge-doped indium oxide (In 2 O 3 ) thin films were prepared by dc magnetron sputtering. The electrical resistivity, 1.6×10 -4 Ω·cm, of the film deposited at 200°C was obtained at 5.5% Ge doping. This was comparable with that of ITO (tin-doped In 2 O 3 ) films. Furthermore, amorphous films with Ge content higher than 5.…
Abstract Poly(3-hydroxybutyrate) [P(3HB)] was prepared by the ring-opening polymerization of (R,S)-β-butyrolactone (BL) using two types of PHB depolymerase with or without substrate-binding domains (SBD) as the catalyst. The SBD lacking PHB depolymerase exhibited better catalytic activities for the ring-opening polyme…
Abstract Lanthanide, Carbacylamidophosphate The coordination compounds of the general formula Ln(NO 3 ) 3 (HL) 2 (H 2 O) 2 H 2 O , where Ln = La, Ce -Nd, Sm -Dy, HL = CCl 3 C(O)NHP(O)[N(CH 2 CH 2 ) 2 O] 2 , dimorpholido-N-tri-chloroacetylphosphorylamide, have been synthesized. The complexes were studied by IR, 1 H and…
An investigation of the mullite decomposition mechanism and kinetics in the temperature range 1900—2000°C was conducted. SEM‐EDS and XRD analysis showed that the decomposition of mullite in this temperature range was primarily caused by the presence of carbon from furnace components. A reaction mechanism, in which gas…
The isobaric thermal conductivity of solid SF6 is investigated in the high-temperature phase. The experimental results are rescaled to a constant density. The isochoric thermal conductivity initially decreases with increasing temperature, then passes through a smooth minimum and begins to grow. A modified version of t…