Materials Literature
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Electrodeposition behavior and thermoelectric properties of the p-type (Bi,Sb)2Te3 films were investigated for thermoelectric energy conversion and nanowire applications. Composition and thermoelectric properties of the electrodeposited (Bi,Sb)2Te3 films were strongly dependent on the electrodeposition current density…
It is difficult to solve the problem of tracing rays through an inhomogeneous medium such as the atmosphere or a flowing liquid with the existing methods whose refractive distribution cannot be characterized by any combination of formulas. A new method is developed to efficiently describe such a medium. The method ess…
A `universal' low-temperature device for laboratory X-ray diffractometers equipped with two-dimensional detectors has been developed. Single-crystal data collections can be performed down to 4 K. Owing to its original design, the completeness of the data set is not affected by the limited number of accessible orientat…
This paper analyzes the casting process characteristics of Mg alloys compared with Al alloys in the production of high quality (i.e. structural) structural vehicle components. The disadvantages of traditional squeeze casting for high quality Mg components has led the authors to develop a novel squeeze casting process…
Enhancement of upconverted luminescence in Er3+∕Yb3+:TeO2 has been observed with increase in the concentration of Yb3+ on excitation with 780nm laser radiation. It is further noted that the upconversion is increased even above the quenching limit on increasing the temperature of the glass. The incident radiation excit…
Effects of extrusion on mechanical properties and damping capacity of Mg-1.8wt.%Cu -0.5wt.%Mn (MCM1805) alloy have been investigated. Tensile tests and dynamic mechanical analyzer were respectively used to measure tensile properties and damping capacity at room temperature of as-cast and as-extruded MCM1805 alloy. The…
We present hole time-of-flight (TOF) data on samples of the discotic liquid crystal hexapentyloxytriphenylene containing ionic impurities. By photogenerating holes at various times after reversing the potential across the cell, we have studied the effect of the ions on the measured TOF for various ionic spatial config…
Magnetic measurements are carried out on polycrystalline Th2Fe17Cx (x=0,0.6,0.9,1.1) samples between 4 and 850 K and magnetic field up to 7 T. This wide temperature range covers both the ferromagnetically ordered region and the paramagnetic region. The ordering temperature, but also the magnetization is found to be ve…
Microstructure and mechanical properties of Mg-Zn-Er-Zr alloys were characterized in detail. The grain size of as-cast Mg-Zn-Er-Zr alloy was greatly decreased by the Mg-Zn-Er phases formed at grain boundaries. The addition of Er can increase the yield strength (YS) but decrease the ultimate tensile strength (UTS) and…
In accordance with the ignition-prevention mechanism of F-containing shielding gas, HFC125 (pentafluoroethane) possesses the potential for forming a F-containing dense film on the surface of a Mg melt to protect it from oxidation and ignition. Importantly, HFC125 has a GWP (global warming potential) value around one e…
The simulation rolling and actual rolling of AZ31 strip with a thickness of 3mm prepared by a vertical twin roll caster (Ø250×150mm) have been made by both Gleeble-1500D thermal simulation testing machine and Ø170×300mm rolling-mill. The influence of various rolling parameters such as temperature (250°C, 300°C, 350°C…
A linear variable displacement transducer has been used to measure the central deflection of 2–3 mm thick polymer samples undergoing three-point bending while exposed to CO2 at pressures of up to 120 bar. Significant reductions in the bending onset temperatures were observed on the application of CO2 for polycarbonate…
Microstructure and mechanical properties of three kinds of Mg-Gd-Sm-Zr alloys have been analyzed in this paper. Results exhibit that the microstructure of as-cast Mg-Gd-Sm-Zr alloy contains α-Mg and eutectic compounds which are mainly comprised of most Mg5Gd-base phases and a few Mg41Sm5-base phases by EDX and XRD ana…
Conventional production process of magnesium alloy strips involves many steps, including multi-hot rolling and multi-heat treatment, which is time-consuming and needs high energy cost. By use of thin strip casting, magnesium alloy cast strip with a thickness of less than 8mm can be produced and then rolled to the stri…
The influence of the base temperature, magnetic field, current, and current sweep rate on the nonlinear transport properties of La2∕3Ca1∕3MnO3 and Fe3O4 films were studied in the regime of strong Joule heating. In resistance-current curves of the La2∕3Ca1∕3MnO3 film an abrupt hysteretic transition was observed that wa…
Human UMP synthase is a bifunctional enzyme that catalyzes the penultimate and last steps in the de novo biosynthesis of UMP. In contrast to prokaryotes, UMP synthase from higher eukaryotes combines the orotate phosphoribosyltransferase and the orotidine-5'-monophosphate (OMP) decarboxylase activities on a single poly…
We report magnetotransport measurements up to 5 Tesla on high purity sintered samples of granular CrO2 with a significantly enhanced grain size. The negative magnetoresistance (MR) as derived from RH isotherms is observed to be unhysteretic up to temperatures as high as 200 K. RH isotherms exhibit some unusual feature…
Density-functional calculations of electronic and vibrational dispersion energies for pristine graphite monolayer (graphene) and single-walled carbon nanotubes (SWCNTs) are presented. Optimized parameters for nonlocal norm-preserving pseudopotentials which replace the potential field due to core electrons are given. C…
An analytical solution of the 3D heat diffusion problem, in the two-pad and four-pad 3ω experimental technique configurations, is achieved using integral transforms. It leads to rapid calculation of the average temperature on the heated area without any numerical problems whatever the dimensions of the narrow strip. S…
The mechanical properties and microstructures of different state cryogenic treatment 3102 Al-foil, such as H19，H26 or O state, were studied by tensile testing, optical metalloscopy (OM) and transmission electron microscope(TEM). The results showed that, after deep cryogenic treatment, the strength of H19 state increas…