Materials Literature
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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…
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…
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…
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…
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-…
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…
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…
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…
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…
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…
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.
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…
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…
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…
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…
The title complexes were synthesised, structurally characterised with single-crystal X-ray diffraction and thermally converted into Pd 0 and MCO 3 solids.
B -site ordering in multiferroic Bi 2 NiMnO 6 thin film was confirmed by synchrotron X-ray diffraction. (1/2 1/2 1/2) superstructure reflection of the film clearly indicated that the Ni and Mn ions in a double-perovskite structure were ordered in a rock-salt configuration. High-flux synchrotron radiation enabled us to…
The distribution of electrons on a carbon nanotube (CNT) under microwave excitation is analyzed here. Numerical results demonstrate that electrons on CNTs are oscillating under the microwave excitation, which means that the electrons can radiate microwaves with the same frequency. The length of CNTs required for micro…
Pockwock Lake, the drinking water supply for the city of Halifax (Nova Scotia, Canada), has been impacted by the deposition of strongly acidic anions. Because long-term monitoring data are lacking, we used diatom-based paleolimnological techniques to track changes in water quality variables in this important water sou…
In this paper, an improved version of a 2-D bidirectional eigenmode expansion propagation algorithm based on Fourier series expansion for modeling optical field distribution in waveguide devices is presented. The algorithm is very simple, numerically robust, and inherently reciprocal. It does not require root searchin…