Materials Literature
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The ability of biphenylates and terphenylates for inducing an anticlinic SmC A * phase in bicomponent mixtures have been tested by the diagram method. The phase was induced for a chain protonated chiral compound mixed with a compound having partially fluorinated chain in the terminal or lateral position of the chains…
Corrosion processes occurring on copper in borate solutions were studied using electrochemical dc and ac as well as surface analytical techniques. It was found that at pH 7 in the absence of sodium dodecylsulfate (SDS), passivity occurs through the formation of a duplex structure. In the presence of SDS, passivity bre…
In this paper, we present recent advances in the understanding of the properties of semiconducting single wall carbon nanotube and in the exploration of their use as field-effect transistors (FETs). Both electrons and holes can be injected in a nanotube transistor by either controlling the metal-nanotube Schottky barr…
The effect of hydrate inhibitors on oilfield scale formation has been studied. A self-consistent activity model is presented to model the effect of methanol on carbonate equilibrium, calcite, barite, gypsum, celestite, and halite solubility in a gas/methanol/water/salt solution. The model uses Pitzer theory to model t…
The antiferromagnetic ground state of bcc chromium can be understood to arise from a new kind of electronic Peierls distortion, taking place solely in the electronic degrees of freedom. The nonmagnetic band structure of Cr as calculated from first principles exhibits an electronic instability within the nonbonding, de…
We have investigated thermoelectric properties of p-type Bi-Te thermoelectric material doped with PbTe. The samples (Bi2Te3)0.2(Sb2Te3)0.8+xmass%PbTe(x=0, 0.05, 0.1, 0.3, 0.5) were fabricated by mechanical alloying and spark plasma sintering(SPS) method. The Seebeck coefficient(α), the electric conductivity(σ) and the…
Some phytoplankton species name published on Chinese journals,books or other scientific information,are synonyms or basionyms.It will lead to confuse when we read these materials.Based on the recent international publications,135 species(include variety and forma)in 37 genera of Bacillariophyta,60 species(include vari…
The aim of this analysis is to assess the issues of cost, safety, performance, and environmental impact associated with the production of hydrogen by so called Area II technologies, not presently funded by the U.S. DOE Hydrogen Program. The hydrogen (H2) rich feedstocks considered are: water, hydrogen sulfide (H2S) ri…
Effects of magnetic field and hydrostatic pressure on martensitic transformation have been examined by using Fe–Pt, Cu–Al–Ni, Ni2MnGa and Fe–Pd shape memory alloys and Fe–Ni alloys. Following results are obtained; (i) in Fe–Pt, Cu–Al–Ni and Fe–Ni alloys, the experimental magnetic field and/or hydrostatic pressure depe…
We present a model that describes doping-induced contrast in photoelectron emission microscopy by including the effect of surface state distributions and doping-induced band gap reduction. To quantify the contrast, the photoyield from the valence band for near-threshold photoemission is calculated as a function of p-t…
A reliable method of synthesis of 3-bromo-N-methylpyrrole by the use of N-bromosuccinimide and a catalytic amount of PBr3 is reported. The method described opens a facile route to a variety of 3-substituted pyrroles, which are otherwise difficult to access. In addition, conditions under which pure 2-bromo-N-methylpyrr…
To increase the fatigue limit of the Carburized gears, the following five techniques need to be developed: 1) Reduce abnormal surface structure. 2) Obtain a fine grain size. 3) Decrease the retained Austenite structure. 4) Increase hardness under the surface. 5) Improve the residual stress distribution under the surfa…
Molecular dynamics simulations of collisions between gas particles and carbon nanotubes at elevated temperatures show that low frequency thermal vibrations of the nanotube dominate the scattering dynamics and that particle–tube energy transfer in the tube radial direction is far more efficient than that in the axial d…
Die phasenreinen Verbindungen auf dem quasibinären Schnitt Nd2O3–SeO2: Nd2SexO3+2x im thermodynamischen Gleichgewicht wurden durch Festkörperreaktion dargestellt und durch Röntgendiffraktometrie, IR-Spektroskopie und DSC-Messungen charakterisiert. Dabei wurde neben den bereits bekannten Phasen Nd2Se4O11, Nd2Se3,5O10,…
The synthesis, crystallography and solution luminescence properties of [Cu18(hfac)10(CCC4Hn9)8] are reported.
The Pb L III -edge EXAFS for PbTiO 3 was measured in the temperature range from 20 K to 873 K. The structural changes in Pb-O and Pb-Ti atomic pairs through the critical temperature (763 K) due to the phase transition from tetragonal to cubic phase were discussed from the local point of view. Three types of atomic pai…
Approaches suitable for analyses of superparamagnetism are studied for a well-isolated ferromagnetic nanoparticle assembly. In order to reduce the effects of the particle size distribution, we prepared iron-nitride particles with a narrow size distribution. In the case of static behavior, it is clarified that the conv…
In this paper, we study the electromagnetic fields propagating through a slab which permittivity and permeability are simultaneously negative. We show that symmetry properties of the wave solution remove all ambiguity in the choice of the sign of the wave numbers inside the slab. Upon developing the Green's functions…
Effects of particle size, velocity, and temperature on the splat morphology have been well studied in the open literature. Effects of melt fraction on deposition efficiency and splat morphology are, however, not well understood. In this paper, we will focus on the melting behavior of in-flight particles and their impa…
From a colloid-chemical viewpoint, an attempt was made to elucidate the mechanism of calcareous deposition on steel plates cathodically protected in seawater. When the catholic current density was increased with keeping the total electric quantity passed constant, it was found that the amounts of both calcium carbonat…