Materials Literature
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The objective of this study was to evaluate the effect of agricultural pollution on periphyton in streams and rivers of southern Québec. We sampled benthic algae incubated from mid-July to mid-August on artificial substrates at 29 sites and analysed the variations in community structure and total community biomass. Di…
An experimental program was conducted in order to determine the effects of microstructure on the high temperature constitutive behavior or powder-processed IN100. The relevant application is the high pressure turbine disk in a gas turbine engine. Eight different microstructures were prepared, with 260 o C yield streng…
High quality ZnO single-crystal films were doped with copper by thermal diffusion, and their luminescent properties were studied by cathodoluminescence spectroscopy. Doping with copper increases the intensity of the green-emission band of the cathodoluminescence spectrum, whose peak, width, and shape at 78 and 300 K r…
The oxide-ion conductivity of two solid-solution systems of a pyrochlore-type composition, (Y1-xLax)2(Ce1-xZrx)2O7 (YLa) and (Nd1-xYbx)2(Ce1-xZrx)2O7 (NdYb), was investigated. The crystal phase of the YLa system with a variable cation radius ratio, r(A3+)/r(B4+), but a constant lattice parameter, changed from the rare…
A comparative study of anodic film growth on niobium, zirconium, and tungsten in 0.4 M Na 2 SO 4 + 0.1 M H 2 SO 4 was performed using the rotating electrochemical quartz crystal microbalance (EQCM). Potential sweep as well as potential step and hold experiments were performed in the range between open circuit and 8 V…
This first report on applications of discharges (or discharge plasma) in a supercritical carbon dioxide environment describes simple generation of nanostructured materials such as carbon nanotubes, nanopolyhedra, and copper nanostructured materials. Carbon nanostructured materials are synthesized by supercritical carb…
Detailed analyses of the solution structure and exchange dynamics of two sets of homologous mono-amide triacetate lanthanide complexes (Ln = Eu, Gd) of cyclen have been undertaken. The complex [LnL1], bearing an N-linked CH2CH2NHCO-pyridyl moiety, forms mono-aqua (q = 1) species in solution and the Gd complex undergoe…
Micro-cellular foaming technology draws attention due to the enhancement of mechanical strength, which has been considered as a weak point of current plastic foaming technology. Foam materials produced by this technology offer improved consistency and homogeneity of cell structure, which can result in products with su…
The adhesion of fine particles plays a significant role in the performance of particulate processes and in the quality of particulate products. The extent of adsorption of water on the particles from the surrounding atmosphere is governed directly by the relative humidity of the air. Published evidence suggests that c…
Abstract The reaction of 2,4,6‐tris(2‐pyridyl)‐1,3,5‐triazine (tptz) with Cu(BF 4 ) 2 ·3H 2 O and N , N ‐bis(3‐aminopropyl)methylamine (Medpt) yielded the monomeric complex [(tptz)Cu II (Medpt)](BF 4 ) 2 ·2MeOH ( 1 ) whereas reaction of tptz with CuCl 2 ·2H 2 O yielded the dinuclear complex [{Cu II Cl 2 }(tptz){Cu II…
The solubility of MgO in molten MgCl2 and CaCl2 has been studied. In pure MgCl2, the MgO solubility was determined to be 0.63—2.90 mol% at 1073—1373 K, while 0.24—0.63 mol% in pure CaCl2 at 1223—1523 K. The effects of MgCl2 and CaO addition to CaCl2 were investigated, and the solubility product of MgO was found to inc…
This study investigated the effect of extractives in wood flour on the mechanical properties of wood-polypropylene (PP) composites. Three different solvents, acetone/water, dioxane/water and benzene/ethanol, were used to remove extractives in both pine and Douglas fir wood flour. X-ray photoelectron spectroscopy (XPS)…
Decreased spectral overlap between a donor biotinylated poly(p-phenylene ethynylene) and a chromophore-labeled streptavidin acceptor leads to better observed fluorescence resonance energy transfer.
To theoretically examine the existence of half-metals in Co-Cr-Fe-Al alloys, band calculations were carried out for these alloys. Seeing energy dispersion curves E(k) of Co2CrAl with the Heusler structure, we find that the Fermi level intersects the E(k) curves in the majority-spin state but is located at the energy g…
Silica coatings have been prepared by the spin-coating technique with the 172 nm vacuum ultraviolet (VUV) irradiation using a Xe2∗ excimer lamp. Perhydropolysilazane was used as a precursor. The chemical states, composition and optical transmittance of VUV-irradiated films were investigated by Fourier transform infrar…
Five distinct analytical techniques were compared for the quantification of the H2O (0·1−7·4 wt%) and D2O (up to 5·5 wt% D2O) contents in rhyolitic glasses. The hydrogen concentration in obsidians was measured using nuclear reaction analysis (NRA) and converted into H2O concentration. The bulk water content (H2O+D2O)…
Particulate reinforced thermoplastic composites are designed to improve the properties and to lower the overall cost of engineering plastics. In this study the effects of adding mica with variable particle size on the mechanical, thermal, electrical and rheological properties of nylon-6 was investigated. Composites of…
Electrolytic copper deposited on single crystals forms pyramidal crystals that grow parallel to the substrate at low current density without stirring. With stirring and higher current density, slanting platelet crystals with orientation are formed. Chloride and gelatin are typical additives for electrolytic copper foi…
A versatile peripheral-pore-nanocasting method is employed to fabricate a series of novel microcapsules with mesoporous shell of noble metal or noble metal oxides, including Pt, PdO, RuO2 and IrO2. The shell thickness of these hollow microcapsules can be adjusted by controlling the depth of 3-amino-propyltriethoxysila…
Asset management strategies are amongst the most important tools to address the economical, reliability, and operational requirements of extensive distribution networks in the environment of increasing deregulation. The key objectives are full utilization (i.e., exploitation of available network reserves), investment…