Materials Literature
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To clarify the origin of the superior field emission characteristics of carbon coated emitters, we investigated the field enhancement at a triple junction and work functions as calculated by ab initio simulations. The electric field near the triple junction is one order of magnitude higher than at other places. Based…
A detailed balanced approach was used to model Intermediate Band (IB) Solar Cells (SCs) in which the IB is a band comprised of either Quantum-Dots (QDs) or Impurity Atoms (IAs). A model assuming identical QDs or IAs with no carrier losses was derived [1] and has a peak efficiency of 63.24% for a bandgap of 1.95 eV wit…
Atmospheric-pressure dielectric barrier discharge (DBD) cold plasma was used to prepare high performance Au/P25 catalysts (Au/P25-P). XRD and UV-Vis DRS spectra for Au/P25 catalysts were performed. The results indicated that the size of Au nanoparticles in Au/P25-P was smaller than that prepared by conventional therma…
In order to prevent DC link voltage pump during braking, a paralleled release circuit composed of chopper and resistor is often employed. As a result of energy waste on the resistor, the efficiency of the motor drive system is low in the case of frequent braking. To improve the efficiency, an energy-saving scheme of m…
This work compares the DC and RF performance for Single Gate(SG) field plated AlGaN/GaN High Electron Mobility Transistor (HEMT) with a Dual Gate(DG) field plated High Electron Mobility Transistor. The maximum drain current obtained for AlGaN/GaN DG field plated HEMT is 1057mA/mm at Vgs=0V and Vds=10V, which is of 396…
Consulting Editor Kenneth J A Brookes reviews three of the presentations at the Tungsten, Refractory and Hard Materials Conference.
Al doped ZnO films (AZO) have been deposited on (100), (110) and (111) Si substrates by RF magnetron sputtering to investigate the influence of Si substrate orientation on the morphology and electrical properties. It has been found that all these films have columnar structures. The grain size of the AZO films deposite…
We have developed thermally stable borosilicate glass for joint thermal processing with in-house synthesized highly nonlinear lead-bismuth-gallium-silicate glass PBG081. Presented pair of glasses is suitable for fabricating all-solid photonic crystal fibers, with high contrast of refractive index at level of 0.42 at 5…
The reasons and the performance of the dissymmetry of the armature-rail system were studied. The current distribution and its force the dissymmetry of Armature or rail in C-shaped armature were analyzed by finite-element method. The calculation was performed with a monolithic armature. As a preliminary study on the di…
As part of our ongoing search to identify “endogenous anti-Alzheimer's molecules” within the human brain we have focussed on indoleamine-2,3-dioxygenase [IDO] and tryptophan [trp]. Although the essential amino acid trp can be metabolised via different pathways, a major route is the kynurenine pathway; IDO is the first…
Polyaniline (PANI) and phosphoric acid (PA) doped sulfonated polybenzimidazole (SPBI) composite membrane was prepared for application in high-temperature proton exchange membrane (PEMFC) without the need of humidification. The synthesis and characterization of targed composite membrane were introduced in this paper.
Combining with both working condition of working roll in tension leveler and wear classification, this paper maintains that abrasive wear is the main type of working roll’s abrasion, and states that shape defects of hot rolled strip is the main cause of the abnormal abrasion of working roll, and concludes that to redu…
Silicon nitride cutting tool, which is widely applied to machine cast irons, is not suitable for steel cutting because of the massive chemical wear between silicon nitride and ferrous materials. Covering protective coating (s) on tool surface is an effective way to isolate the chemical contact between cutting tool and…
Electrochromic composite film consisting of TiO2, chitosan (CS) and carbon nanotubes (CNTs) were fabricated on quartz and FTO substrates by the layer-by-layer self-assembly method (LbL). The multilayer film was characterized by UV-vis spectrum, scanning electron microscopy (SEM), cyclic voltammetry (CV) and chronoampe…
Smart behavior of cement based composites containing carbon nanotubes was studied under compression. The results show that the conductivity of the composites is related to the pressure level. For monotonic loading, the electrical resistance decreases correspondingly with increasing stress. For cycling loading, the ele…
A simple and sensitive ultra-performance convergence chromatography system coupled with a diode array detector for analysis of paclitaxel, 10-deacetyl-7-epipaclitaxel and cephalomannine in paclitaxel injection was developed. The analyses were carried out on a Waters Acquity UPC2 BEH 2-EP using the mobile phase of mixt…
Unidirectional invisibility in parity-time-symmetric systems has been so far predicted in one-dimensional (1D) structures, i.e., for planar slabs that are reflectionless when excited in one direction, while have strong reflections from the other direction. Here we generalize this concept to three-dimensional (3D) syst…
On page 4286, A. W. Clark and co-workers demonstrate engineered DNA-nanoparticle binding events that are used to assemble and plasmonically couple nanophotonic bowtie structures. The binding event is engineered to tune the resonance peak of the bowtie to correspond to a 633 nm laser. Surface enhanced Raman spectroscop…
Changes in electrical properties of three identical single layer graphene-based field-effect transistors (G-FETs) after being oxidized through ultraviolet (UV)/ozone (O3) treatment are presented. A decrease in carrier mobility was observed after oxidation. However, carrier mobility recovered after irradiating oxidized…
This paper proposes an energy dissipation device based on shape memory alloys (SMA) for frame structures. By setting anchorage device below and near the inflection point of the first storey columns, a set of force cable and energy dissipation cable using SMA are installed symmetrically in the anchorage device and the…