Materials Literature
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Luminescence properties of cerium doped Y3Al5O12(YAG) nanocrystals in form of nanopowders and nanoceramics have been studied. The comparative analysis of luminescence characteristics for nano- and single-crystals has been done. It was detected that an excitonic mechanism of the energy transfer from the host lattice to…
Ultrafine-grained titanium was processed by severe plastic deformation (SPD). The SPD was carried out by equal channel angular pressing (ECAP) at high temperature. The ECAPprocessed sample was further deformed by conventional techniques such as radial forging and drawing. The microstructure was characterized quantitat…
A suspension of commercially available single-walled carbon nanotubes (SWNTs) is directly deposited onto a platinum multielectrode array surface. This is a novel and easy method to reduce interface impedance values which can be used instead of electromodified electrodes. This paper shows that this deposition method is…
Investigations of magnetic micro- and nanoparticles for targeted drug delivery began over 30 years ago. Since that time, major progress has been made in particle design and synthesis techniques, however, very few clinical trials have taken place. Here we review advances in magnetic nanoparticle design, in vitro and an…
This paper presents an analysis of the arcing and flashover performance of contaminated dc insulators of various suspension patterns at high altitudes (1970 m). The experiments tested two types of dc insulators, a bell-type insulator and a tri-shed suspension insulator. The experimental results show that dc arcs play…
This paper discusses electrical insulation characteristics of liquid nitrogen (LN2) / polypropylene (PP) laminated paper composite insulation system for the practical electrical insulation design of high temperature superconducting (HTS) cables. Partial discharge (PD) inception, propagation and breakdown (BD) characte…
The luminescence excitation spectra, luminescence spectra and the nanosecond-scale decay kinetics were studied. The ZnO and ZnO:Al nanopowders were prepared by vaporization-condensation in a solar furnace using different raw powders: commercial, hydrothermal and those obtained by plasma synthesis. Exciton-phonon as we…
A novel characterization metric for phase change memory based on the measured cell resistance during RESET programming is introduced. We show that this dasiadynamic resistancepsila (Rd) is inversely related to the programming current (I), as Rd= [A/I] + B. While the slope parameter A depends only on the intrinsic prop…
In view of increasing rate of lead pollution resulting from discharge of lead containing effluents by industries into the environment, this study was carried out to investigate the removal of Pb 2+ from aqueous solutions by oyster, snail and periwinkle shells. The effects of contact time and concentration on adsorptio…
A method is presented for increasing the measurement accuracy of GMR (giant magnetoresistive) sensors by numerically eliminating the hysteresis in the output signal. A simplified mathematical model of the hysteresis has been derived from the T(x) hysteresis model for anticipating the measurement values. The model has…
We fabricated a carbon nanotube (CNT) via interconnect and evaluated its robustness over a high-density current. CNTs were synthesized at temperatures as low as 365 °C, which is probably the lowest for this application, without degrading the ultra low-k interlayer dielectrics (k = 2.6). We measured the electrical prop…
Detecting insulation flaws in HVDC apparatus, where partial discharge (PD) may occur can help preventing failures, even if the degradation rate under PD is much slower than in AC conditions. In order to improve reliability of HVDC systems and, in particular of HVDC transmission lines, it would be important to distingu…
Abstract The effect of a Mg- and Al-containing layered double hydroxide (LDH), used as an additive or as a matrix, on the dissolution and solubility of two non-steroidal anti-inflammatory drugs (NSAIDs), namely, mefenamic and meclofenamic acids, is reported. The use of MgAl-LDH enhances the solubility of mefenamic aci…
Investigations dealing with the treatment of aqueous systems by physical methods show that ultrasound is an effective reagentless and highly ecological method of water purification of organic pollutants and microorganisms. Its use is particularly effective in combined methods of treatment: ultrasound + ultraviolet irr…
Density functional theory calculations were performed to obtain an atomistic understanding of facet formation on Ir(210). We determined geometries and energetics of clean and oxygen-covered surfaces of planar Ir(210) as well as Ir(311) and two types of Ir(110) surfaces, which are involved in faceting by forming three-…
Graphene, a recently discovered form of carbon, revealed many unique properties, including extremely high electron mobility of ~15000 cm2/Vs at room temperature (RT). We have experimentally studied the thermal conductivity of graphene suspended over a trench in silicon (Si) wafer. It was found for a given set of sampl…
We develop a theoretical and computational model to investigate the ballistic response of a hybrid twolayered flexible armor system.In particular, we study the effects of stacking order of the two fibrous layers, which have distinctly different mechanical properties, on the V 50 limit velocity.A system consisting of K…
Abstract: Boron carbonitride (BCN) thin films with a thickness of ~4 µm were synthesized on Si (100) substrate by radiofrequency and microwave plasma enhanced chemical vapor deposition using trimethylamine borane [(CH3)3N.BH3)] as a molecular precursor. The microstructures of the films were evaluated using field emiss…
In this paper, a series of organic-inorganic hybrid materials consisting of epoxy resin frameworks and dispersed nanoparticles of amino-modified silica (AMS) were successfully prepared. First of all, the AMS nanoparticles were synthesized by carrying out the conventional acid-catalyzed sol-gel reactions of tetraethyl…
With an increasing ageing population, the incidence of pressure sores and incontinence is becoming an increasing burden on the health sector and requires new forms of intervention. Three dimensional knitted spacer fabrics can afford a range of properties making them ideal for use against the skin in a variety of medic…