Materials Literature
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A novel uni-body composite pylon has been proposed for 400 kV transmission lines with advantages of compacted size, friendly looking and cost competitiveness. As its configuration is quite different from the traditional lattice pylon, its electrical performance needs in-depth investigation and evaluation, for which el…
Asphalt concrete consists of coarse aggregate, fine aggregates, fillers and binder. Fines passing a #200 sieve are called fillers, and most often contain mica. Previous studies show that the presence of mica reduces the strength of asphalt concrete. This study evaluates the mineral and chemical composition of asphalt…
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A three-step procedure for preparing polyurethanes with mixed polyether segments was suggested. It involves preparation of the “inverse” prepolymer by the reaction of one of oligodiisocyanates with 1,4-butanediol taken in a double excess, followed by the reaction with the other oligodiisocyanate. Polyurethanes with al…
In this talk, we report on GeTe RF switches on silicon substrate with state-of-the-art switch figure-of-merit of ~14 femtosecond or 11 THz, ~20x greater than all of current FET switches. This was accomplished using an embedded refractory micro-heater with reduced parasitics. The spectral responses of the GeTe-based RF…
A new green, environmentally and economically photooxygenation of olefins by molecular oxygen in the presence of 4-carboxyl tetra phenyl porphyrin (H2TCPP), Rose Bengal (RB), Methylene Blue (MB) and some metallosensitizers (MS) such as cobalt phthalocyaninesulfonate (Coph(SO3H)[Formula: see text], MnTCPPCl, FeTCPPCl a…
In this paper we expand the scope of catalysts able to mediate the ring opening polymerisation of the phosphonate monomer 2-methyl-1,3,2-dioxaphosphalone-2-oxide. A range of nitrogen bases efficiently catalyse the reaction, each with pK as of 19 or above; lower pK a bases do not ring open the monomer. Aluminium based…
Novel chiral porphyrin ligands were synthesized from four different chiral aldehydes. In situ transition metal complexes of these novel chiral porphyrin ligands were found to catalyze asymmetric epoxidation reaction of styrene possessing various substituents. The chiral epoxides were formed in excellent yield and ee.
We studied the electronic structure and the magnetic properties of Nd 2 Fe 14 B by using the full potential linearized augmented plane wave method. The density functional theory was employed with Hubbard-type on-site Coulomb potential U to treat the localized 4f electrons of Nd. We found that the ferrimagnetic (ferri)…
Abstract Bulk samples of the BixSe1-x system with (x = 0, 5, and 10) were prepared using conventional melt quenching technique. Thin films were then deposited by thermal evaporation technique under high vacuum conditions from the prepared bulk samples. Effect of Bi substitution on surface morphology, electrical and op…
The Raman spectra obtained in the case of graphene-like 2H-MoS2 and 2H-WS2 nanoparticles and depending on their average sizes in the [013] and [110] crystallographic directions are reported. It is established that the Raman spectra of graphene-like 2H-MoS2 nanoparticles and micron particles are closely related. Simila…
Gravimetric technique was used to study the inhibition of aluminium alloy AA8011 in an alkaline medium using an eco-friendly inhibitor, Palisota hirsute. The study revealed that the extract reduced the corrosion rate of aluminium AA8011 from 0.407 mm/yr to as low as 0.106 mm/yr in 0.25 M KOH after being exposed for fi…
The results of studies and comparative analysis of thermal properties and photostability of zinc(II) complexes with tetramethyl- and tetraphenyl-substituted dipyrrins and tetraphenyl- meso -azadipyrrin are reported. The thermal decomposition of complexes starts in the temperature range between 293 and 481°C depending…
Biodegradable polymer yarns of polymer blends of poly(lactic acid) (PLA) and poly(butylene succinate-co-adipate) (PBSA) reinforced with natural fiber were prepared by a micro braiding technique. The biodegradation of the micro-braid yarn was studied by field tests. The yarn are prepared from polymer blends of PLA:PBSA…
The dielectric spectra of Pb1–x Ba x (Mg1/3Nb2/3) m (Zn1/3Nb2/3) y (Ni1/3Nb2/3) n Ti z O3 (x = 0–0.15, m = 0.4541, y = 0.0982, n = 0.1477, and z = 0.3) ceramic samples have been studied in wide intervals of temperature (10–873 K) and frequency of the measurement electric field (0.1–1000 kHz). It has been found that an…
Abstract Poly(ethylene glycol ‐co‐ DL‐lactide) (PELA) is a biodegradable polymer, which has attracted considerable interest in the area of drug release due to its potential as drug carrier. Drug‐loaded electrospun PELA fibers tend to be a promising candidate for local chemotherapy application in the future. In this st…
We investigated the visible emission property of Pb(Zr,Ti)O 3 (PZT) thin films irradiated with gammy-ray (γ-ray) irradiated at various total doses up to 1000 kGy. The PZT thin films were prepared on Pt/Ti/SiO 2 /Si substrates by using a sol-gel method with a spin-coating process. The visible emission was found to emer…
Transformational acoustics offers the theoretical possibility of cloaking obstacles within fluids, provided metamaterials having continuously varying bulk moduli and densities can be found or constructed. Realistically, materials with the proper, continuously varying anisotropies do not presently exist. However, discr…
Lattice, charge, orbital, and spin are the four fundamental degrees of freedom in condensed matter, of which the interactive coupling derives tremendous novel physical phenomena, such as high-temperature superconductivity (high- T c SC) and colossal magnetoresistance (CMR) in strongly correlated electronic system. Dir…
We report the realization of high performance BP transistors integrated with an ultra-thin HfO2high-k gate dielectric using a low temperature CMOS process. The fabricated devices were shown to demonstrate an enhanced hole mobility of >400 cm2/Vs and subthreshold swing (SS) of ∼69 mV/dec at room temperature. These figu…