Materials Literature
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Maintenance and operation of electrical systems in mining facilities fed by long Over Head Lines (OHL's) require configurations with two or more power transformers for ensuring high reliability and availability. This work presents the methodology developed for the study of an actual problem related with the connection…
The applicability of constitutive parameters for description of electromagnetic processes in heterogeneous media is studied at frequencies at which dimensions of the particles of the media are still substantially smaller than the wavelength in this medium but already are comparable with this parameter. It is proved th…
A compact, internally heated, catalytic reactor is demonstrated for the low-temperature oxidation of carbon monoxide. Carbon nanofibres were grown on carbon felt and used as a support material for Au/TiO 2 catalysts. The carbon composite plays two roles; as a support material for the catalyst and for providing heat to…
The subsolidus phase diagram of the system Bi 2 O 3 –ZnO–Ta 2 O 5 in the region of the cubic pyrochlore phase has been determined at 1050°C. This phase forms a solid solution area that includes the ideal composition P, Bi 3 Zn 2 Ta 3 O 14 ; possible solid solution mechanisms are proposed, supported by density measurem…
Oxygen is a potent modulator of cell function and wound repair in vivo. The lack of oxygen (hypoxia) can create a potentially lethal environment and limit cellular respiration and growth or, alternatively, enhance the production of the specific extracellular matrix components and increase angiogenesis through the hypo…
One of the major issues in a long-term perspective for the use of wood–plastic composites (WPCs) in outdoor applications is the moisture sensitivity of the wood component and the consequent dimensional instability and susceptibility to biological degradation of the composite. In this work, the effects of using an acet…
The new grade has significantly improved corrosion resistance in chloride solutions compared with currently available super duplex stainless steels (e.g. UNS S32750) and the 6Mo austenitic stainless steels (e.g. UNS S31254). Some references in industrial heat exchanger applications are highlighted.
Properties of a new sealing composition with high heat-resistance (up to 250°C) and dielectric characteristics and with a decreased density are described. Sealants on the basis of low-molecular-mass dimethylsiloxane rubber SKTN-1 and oligodimethylsiloxane (ODMS) rubber with terminal hydroxyl groups are used as objects…
Comparing with pure copper, the corrosion behavior of copper clad laminate (CCL) in NaCl solution was studied by using linear polarization, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). It was shown that the CCL had a different corrosion behavior and showed a lower corrosion resistance com…
International Symposium on Antennas and Progagation, Singapore, SINGAPORE, NOV 01-04, 2006
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…
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…
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…
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…
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…