Materials Literature
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Potassium feldspar crystals from the Alto da Cabeca (Boqueirao), Rio Grande do Norte (sample BQ) and the Morro Redondo, Minas Gerais (sample MR) pegmatites in Brazil have a typical adularia fourling habit consisting of a combination of Baveno and Manebach twins. Crystal morphology suggests a monoclinic symmetry, but X…
We have studied the impact of sulfur cleaning for (100), (111)A, and (111)B InGaAs surfaces with In content of 0.53 and 0.70 and their Al2O3/InGaAs MOS interfaces using an (NH4)2Sxsolution. We found that the sulfur cleaning can effectively remove native oxides from InGaAs surfaces and passivate the InGaAs surfaces by…
For nanowires with a parabolic potential, the effect of an electric field E orthogonal to the system’s axis on the mobility of charge carriers μ is investigated. With consideration for the interaction of charge carriers with a rough surface, it is shown that, for a nondegenerate electron (hole) gas, the mobility μ dec…
High-technology fields require new high-dielectric-permittivity materials. A three-phase composite with multiwall carbon nanotube (MWNT) and BaTiO3particles embedded into polyimide (PI) substrates by in-situ polymerization. The BaTiO3-MWNT/PI composite with low dielectric loss displayed relatively high dielectric cons…
Simple shear flow has been widely used as a model flow system to investigate the rheological properties of complex fluids. Although it is useful and easy to apply, the shear flow is too simple compared with the complicated flows encountered in real processes. For this reason, it is necessary to study the rheological p…
Hybrid film structures of the photonic crystal (opal)/glassy chalcogenide semiconductor (Ge 2 Sb 2 Te 5 ) type, which exhibit strong variations in the intensity of reflected light due to the resonant excitation of anomalous diffraction (Wood anomaly), have been synthesized. A method of controlling the resonant optical…
A surface-discharge plasma source based on dielectric barrier discharge (DBD) has been developed for use in sterilization and cleaning. In these processes, ozone-generation ability is one of the key factors in regard to atmospheric plasma sources. However, it was observed that ozone density decreased during plasma dis…
In this work, syndiotactic polystyrene was injection molded with different molding conditions. The morphology distribution inside the molded parts was analyzed by several techniques, including optical microscopy, IR spectroscopy, and X-ray diffraction. The final morphology distribution was found to be strongly affecte…
We investigated the effect of additives on the morphology of a poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b′]dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT):(6,6)-phenyl C 71 -butyric acid methyl ester (PC 71 BM) blended onto a surface of poly (3, 4-ethylendioxythiophene): poly(styrensulfonate)(…
In this paper, we present a new type of a double-negative meta-material (MTM) absorber with a periodic array composed of a split-ring resonator (SRR) and open complementary split-ring resonators (OCSRRs) for magnetic and electric response, respectively. In order to avoid the need for this metallic back plate, a planar…
A new approach for studying complex feedstock conversion with a hydrocracking catalyst is proposed in this work. The reaction was carried out in a batch reactor. Vapor and liquid samples were taken at different reaction times, both at operating conditions and after cooling to room temperature. Two-dimensional gas chro…
Niobium carbide nanocrystals of ~1:1 stoichiometry have recently been observed for particle sizes ranging from Nb4C4to Nb50C50. Infrared (IR) spectroscopic measurements show that a new band of IR vibrational modes appears with increasing particle size at Nb9C9. Using density-functional theory, we show that the vibrati…
A linear correlation has been found between the Grüneisen parameter and the ratio of the propagation velocities of longitudinal and transverse acoustic waves in vitreous solids. The relation between these quantities has been interpreted in terms of the Pineda model.
This paper describes usage of several condition monitoring techniques to evaluate the failures and failure modes of generator stator insulation. Authors have included several case studies of insulation weaknesses and failures of generators in Sri Lanka. Author's recommendations to use DC ramp test for the evaluation o…
Tensile tests of an individual ZnS nanowire with a cubic structure were performed with a nano-manipulator inside a scanning electron microscope (SEM). To perform the tensile test of ZnS nanowires, a mechanical testing system was installed in the SEM. A nano-manipulator was set up in the SEM, and a cantilever force sen…
Poly(ϵ-caprolactone) microreactors were prepared by micro-volcanic rupture of freeze dried microspheres. Effects of three synthesis parameters viz polymer concentration, emulsifier concentration and stirring speed on size and morphology of microreactors were examined. Average diameter of microreactors showed substanti…
In this paper, we carried out an experimental study of graphene-on-gold structure based on Surface Plasmon Resonance Imaging (SPRI) method. To our knowledge, this is the first experimental report of graphene SPR study. An experimental SPRI platform was setup, which can fulfill wide incident angle range covering the re…
We compared the high temperature electrical characteristics of GaN MOS capacitors and MOSC-HEMTs on sapphire, Si and bulk GaN substrates. From the flatband voltage shift of the capacitors, we extracted a pyroelectric voltage coefficient of 7.4×104V/m-K and 8.5×104V/m-K for sapphire and bulk GaN substrates. The complex…
In this work we apply a refined Wang–Landau simulation to a simple polymer model which has an exact solution both in the microcanonical and the canonical formalisms. We investigate the behavior of the microcanonical and canonical averages during the Wang–Landau simulation. The simulations were carried out using conven…
The influence of ion-plasma treatment of Cd1 − x Zn x Te (x ∼ 0.04) single crystals, which precedes the deposition of an antireflection coating (a diamond-like a-C: H: N film) on the optical properties of the resulting structure, is investigated. Treatment is carried out in an argon, nitrogen, and hydrogen plasma. As…