Electromagnetic Scattering Properties in a Multilayered Metamaterial Cylinder
International Symposium on Antennas and Progagation, Singapore, SINGAPORE, NOV 01-04, 2006
Materials Literature
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Metal-insulator transition in whiskers of the NbS3 quasi-one-dimensional conductor under pressure
The effect of pressure on the conduction of the NbS 3 quasi-one-dimensional conductor is studied. A pressure-induced insulator-metal transition is observed. The transition is accompanied by an increase in conductivity by six orders of magnitude at room temperature. Under pressures of 3–4 GPa, an additional phase trans…
Mineralogy, chemistry and physical properties of bentonites from Başören, Kütahya, W Anatolia, Turkey
Abstract The bentonite deposits in Başören Kütahya, W Anatolia, Turkey were formed by alteration of Pliocene perlite and pyroclastic rocks. Two types of bentonites are distinguished in this area on the basis of their physical properties, chemistry and occurrence. Bentonites were examined to determine their mineralogic…
The activation of supported Au catalysts prepared by impregnation
In this study, Au/TiO 2 , Au/γ-Al 2 O 3 , and Au/C catalysts were prepared by an incipient-wetness impregnation method. The CO oxidation activity after different pretreatment was analyzed. Two pretreatments are found possible to activate these catalysts for CO oxidation: (i) high-temperature hydrogen reduction and (ii…
Tribochemistry and material transfer for the ultrananocrystalline diamond-silicon nitride interface revealed by x-ray photoelectron emission spectromicroscopy
The authors report tribochemical changes due to sliding of a silicon nitride (Si3N4) ball against an ultrananocrystalline diamond (UNCD) thin film. Unidirectional sliding wear measurements were conducted for 2000cycles using a ball-on-disk apparatus with a 3∕16in. diameter Si3N4 ball at a sliding speed of 3.3mm∕s and…
Diatom Deformities from an Acid Mine Drainage Site at Friendship Hills National Historical Site, Pennsylvania
Algae have been observed in many different extreme environments. We conducted a taxonomic diatom survey from Ice Pond Run stream, Friendship Hills National Historic Site, Fayette County, Pennsylvania in 2002. This stream is chronically impacted by acid mine drainage. The pH observed was low and ranged from 1.91 to 2.2…
Kinetics and mechanism of the anionic polymerization of acrylamide monomers
The thermodynamics, kinetics, and mechanism of the anionic polymerization of a number of acrylamide monomers has been studied with the use of isothermal and scanning calorimetry, liquid chromatography, 1 H NMR and IR spectroscopy, mass spectrometry, and chemical analysis of functional groups. It has been demonstrated…
Attenuated Total Reflection Fourier Transform Infrared Spectroscopic Investigation of CO Adsorption on Hydrated Ru/Al2O3
The adsorption of CO on hydrated 5 wt % Ru/Al 2 O 3 produced ν CO absorbance features at ∼2048, 1992, and 1924 cm -1 that are red-shifted by 50−116 cm -1 from those seen in the absence of water (2020−2040, 2080, and 2140 cm -1 ). This red-shift most likely arises from dipole−dipole interaction between coadsorbed CO an…
Structural, magnetic, and transport investigations of CrTe clustering effect in (Zn,Cr)Te system
We investigate the structural, transport, and magnetic behaviors of (Zn,Cr)Te system without additional carrier doping grown by low temperature molecular-beam epitaxy on GaAs (100) substrates. For the growth of Zn1−xCrxTe with x=0.14, high-resolution transmission electron microscopy shows the possibility of zinc-blend…
Efficacy and safety of chitosan HEP-40 in the management of hypercholesterolemia: a randomized, multicenter, placebo-controlled trial.
UNLABELLED: Hypercholesterolemia is an important risk factor for cardiovascular disease (CVD). OBJECTIVE: To compare the efficacy of a 12-week treatment regimen with HEP-40 low-molecular weight chitosan given at daily doses of 1,200 mg, 1,600 mg, and 2,400 mg in reducing serum low-density lipoprotein cholesterol (LDL-…
High Density Fuel Development for Research Reactors
An international effort to develop, qualify, and license high and very high density fuels has been underway for several years within the framework of multi-national RERTR programs. The current development status is the result of significant contributions from many laboratories, specifically CNEA in Argentina, AECL in…
Formation of the structure of cerium oxide-modified titanium dioxide
The formation of the structure of titanium dioxide containing 3–15 wt % CeO 2 in a wide temperature range (300–850°C) has been investigated by X-ray powder diffraction, electron microscopy, and adsorption methods. Modification of titanium dioxide with cerium oxide causes the formation of nanostructured Ce-Ti-O compoun…
Desenvolvimento de nanocompósitos polipropileno/argila bentonita brasileira: I tratamento da argila e influência de compatibilizantes polares nas propriedades mecânicas
Os nanocompósitos de polipropileno/ bentonita e polipropileno/compatibilizante/bentonita foram preparados empregando uma extrusora dupla rosca acoplada a um Reômetro de Torque Haake. A argila bentonita natural proveniente do Município de Boa Vista - PB passou por um processo de purificação para em seguida ser aditivad…
Chemical crystallization of diamond and the diamond coating deposition from gas phase
A radically new synthetic method, called the diamond chemical crystallization from gas phase, is described; the credit of its development is due to Russian researchers. The steps in its development and principal results of the studies in the diamond chemical crystallization and diamond coating deposition from gas phas…
Crystal structures of low-symmetry cancrinite and cancrisilite varieties
The high-sodium variety of cancrinite [Si 6.3 Al 5.7 O 24 ][Na 2 (H 2 O) 2 ][Na 5.7 (CO 3 ) 0.9 (SO 4 ) 0.1 (H 2 O) 0.6 ] (Kovdor Massif, Kola Peninsula, Russia) and the calcium-containing variety of cancrisilite [Si 6.6 Al 5.4 O 24 ][(Na 1.2 Ca 0.4 )(H 2 O) 1.6 ][Na 6 (CO 3 ) 1.3 (H 2 O) 1.2 ] (Khibiny Massif, Kola P…
Mössbauer emission spectroscopy of grain boundaries in poly- and nanocrystalline niobium
Grain boundaries in polycrystalline Nb, prepared by cold rolling with subsequent recrystallization annealing, and nanocrystalline Nb, obtained by high-pressure torsion, have been studied by 119m Sn Mössbauer spectroscopy and the data obtained have been compared.
Shape Memory Alloy Based Smart Landing Gear for an Airship
The design and development of a shape memory alloy based smart landing gear for aerospace vehicles is based on a13; novel design approach. The smart landing gear comprises a landing beam, an arch, and a superelastic nickeltitanium shape memory alloy element. This design is of a generic nature and is applicable to a ce…
Molecular dynamics simulation of thermodynamic properties of YAG
In this paper we study the thermodynamic properties of Y 3 Al 5 O 12 (YAG) by using molecular dynamic method combined with two- and three-body potentials. The dependences of melting process, elastic constant and diffusion coefficient on temperature of crystal YAG are simulated and compared with the experimental result…
Multifunctional Structural Composite Batteries
We are developing structural polymeric composites that both carry structural loads and store electrochemical energy. These multifunctional batteries could replace inert structural components while providing supplementary power for light load applications. If designed with sufficient structural and energy efficiency, t…
Production and storage of hydrogen: Present scenario and future perspective
Hydrogen (H 2 ), an environmentally clean energy-carrier gas, is produced mainly from fossil fuel, biomass and water. H 2 (90%) is produced at high temperature by the reactions of natural gas or light oil fractions with steam, besides coal gasification and electrolysis of water. Among biological production of H 2 , di…