Materials Literature
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Due to their periodic helical structure, cholesteric liquid crystals (CLC) have a unique ability to selectively reflect visible light. CLC films reflecting a broad wavelength band were made by inducing a pitch gradient in CLC through a diffusion of small molecules and through a thermal diffusion between two CLC oligom…
Vacuum refining experiments of indium and gallium metals have been performed. When indium metal of 99.97% purity was refined at 1273 K and 1.3×10−3 Pa for one hour, Pb and Bi were effectively removed from indium metal. After refining 99.9% Ga at 1373 K and 1.3×10−3 Pa for six hours, removal of Bi, Pb, Zn, Mg, Ca and F…
The electrical properties of lead zirconate titanate (PZT) and strontium bismuth tantalate (SBT) thin films are compared for nonvolatile random access memory applications. PZT thin films have high switchable polarization with poor fatigue resistance and higher leakage current densities as compared to SBT thin films de…
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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…