Materials Literature
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Measured carrier temperatures of quantum dots lasers, between 200 K and 400 K, are different to that of the lattice and depend on doping type. This has consequences for thresholds and device models.
We fabricated Si: SiO2films and assessed its optical characteristics using photoluminescence spectroscopy. The Si: SiO2films were deposited by sputtering Si tablets (15 mm square) onto a SiO2target (108 mm diameter). Using excitation by a He-Cd laser, photoluminescence was emitted from the films. The bluish color emis…
The microstructure and mechanical properties of Al-17Si-2Fe-2Cu-1Ni (mass fraction, %) alloys with 0.4% or 0.8% Mn produced by semi-solid casting process were studied. The semi-solid slurry of the alloys was prepared by ultrasonic vibration (USV) process. With USV process, the average grain size of primary Si in the a…
Epoxy composites with and without of Al2O3nano fillers have been evaluated by measuring complex permittivity as a function of frequency and temperature. Dielectric Spectroscopy measurements have been carried out on different formulations of epoxy with as-received and pre-processed nanoparticles. It is observed that ad…
As-cast AZ61 magnesium alloy was treated by solution under a high-pressure of 3 Gpa at different temperatures, atmospheric temperature, 200, 400, 600, 800 and 1000 °C. The microstructure of the products was observed by optical microscope. The mechanical properties of the products were investigated by brinell hardness…
In this paper, a barrier was designed to reduce cogging torque. However iron loss and temperature rise according to the designed barrier can present problems. Iron loss of the optimized model is 2.8[%] larger than that of the basic model, because the sinusoidal flux density at the end of the stator teeth was increased…
The improvement of the moisture barrier properties of PET via blending with PEN was studied. The microstructure of the bottle parisons and bottles were examined with scanning electron microscope (SEM). The transesterification reaction during PET/PEN injection molding and blow molding were confirmed by 1H-NMR. Water va…
In this research we calculated different property of zig-zag polyhex carbon nanotubes TUHC6 [2p,q] with various circumferences [2p] and fixed lengths [q]. Density functional theory (DFT) calculations were performed to calculate energy and electronic properties, which were performed based on the Becke's 3-parameter for…
The pressing chamber is the heart of the screw press, it forms the drainage barrel and has to contain the operating forces of the press. As press casing is an integral part of pressing chamber, the strength of the press casing ensures normal operation of the press. The mechanical models of pressing chamber of the ZX10…
In spite of the fact that many models of protein structure prediction have been proposed and have also been widely studied in the last years, little attention has been given to the discrete models with side chains. Few papers present algorithms that try to predict the 3 dimensional structures of protein from their ami…
Cu(In,Ga)Se2 (CIGSe) solar cells were fabricated independently by industrial scale co-evaporation in two separate production lines with the same nominal composition and thickness of the absorber film. Although the device properties were believed to be the same we observed substantial deviations of the respective value…
By using the electron microscope scanner, we have done some research and analysis about the internal microcosmic structure of sea sand concrete. And combined with micro-XRD analysis as well integrative thermal analysis, we made observations of the internal composition of sea sand concrete., studying the effect on whic…
In the last few decades research efforts were conducted to grasp good understanding about the origin of equiaxed and columnar grains formed during solidification. The morphological evolutions such as globular/cellular to dendritic or columnar-to-equiaxed transition were generally studied. Correspondingly, some empiric…
We have carried out first-principles calculations to study the lattice constants, elastic constants and some fundamental electronic properties of lanthanum hexaboride under different pressures. The calculated bulk modulus and lattice constant are in agreement with previous theoretical results. The elastic constants in…
Keywords: Hot-Dip Aluminum; Corrosion resistance; Fe-Al Intermetallic alloys Abstract. The hot-dipping Al coating was developed on 22MnB5 steel surface. Effects of corrosion resistance with different dipping time coatings were investigated in this paper. It is describes an approach to improve the corrosion resistance…
Dielectric breakdown strength of poly (ethylene-co-butyl acrylate) (EBA) nanocomposites filled with spherical alumina particles was studied as a function of particle coating and relative air humidity. The nanocomposites were prepared from a mixture of EBA formulations (13 wt% butyl acrylate groups content) and alumina…
Mesoporous TiO2 (m-TiO2) nanoparticles were used to prepare the porous film electrodes for dye-sensitized solar cells, and a second metal oxide (MgO, ZnO, Al2O3, or NiO) modification was carried out by dipping the m-TiO2 electrode into their respective nitrate solution followed by annealing at 500 °C. Experimental res…
Current conduction of different resistance states has been studied with low frequency noise analysis in this work. A model consisting of two parallel resistances from conductive filament and uniform leakage oxide is proposed to represent the conduction in filament type switching resistive random access memory cell. It…
The initial adsorption of oxygen molecules on Si(001) is investigated at room temperature. The scanning tunneling microscopy images reveal a unique bright O 2 -induced feature. The very initial sticking coefficient of O 2 below 0.04 Langmuir is measured to be ∼0.16. Upon thermal annealing at 250–600 °C, the bright O 2…
The ferromagnetic semiconductor p -InMnP:Zn epilayers were prepared through low-temperature annealing at 250 °C by using Mn/InP:Zn bilayers. The p -type InP:Zn epilayers were prepared by using metal-organic chemical vapor deposition. Then, ultra-thin Mn layers were subsequently deposited onto the layers by using molec…