Materials Literature
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The field emission properties of a polycrystalline diamond film with hydrogenated and hydrogen free surfaces have been investigated by monitoring both the emission current–voltage curve and emission site density. A very low turn-on field of electron emission was found to be 0.5 V/μm for the hydrogenated surface and 4…
Unsized AS-4 carbon fibers were subjected to RF plasma etching and/or plasma polymerization coating in order to enhance their adhesion to vinyl ester resin. Ar, N2 and O2 were utilized for plasma etching, and acetylene, butadiene and acrylonitrile were used for plasma polymerization coating. Etching and coating condit…
The molecular conformations and packing of [(tBuCO2)3M2(mu-X)M2(O2CtBu)3], where M = Mo and W, and X = oxalate and perfluoroterephthalate, determined in the solid-state from powder X-ray diffraction analysis, reveal one-dimensional coordination polymers involving pivalate-oxygen to metal interactions (X = perfluoroter…
The effect of the cathode-to-anode area ratio on the normalized power density for solid oxide fuel cells was investigated. A geometrically symmetric cell having a screen printed cathode produced a power density of 0.45 W / cm 2 at 800 ° C . However, using a cathode with a geometric area significantly less than that of…
Graphite crystals were formed from a mixture of poly (vinyl pyrrolidone) (PVP) or polyacrylamide (PAA) pow-der and magnetite powder at 1150-1200°C. The graphite was identified by X ray diffraction and transmission elec-tron microscopy. The carbon yield from PAA at 1200°C was about four times of that from PVP, but PAA…
A simplified method to evaluate the premixing molten core mass is proposed, based on the molten jet breakup length and settling/cooling dynamics of the particles generated from the jet surface. The present method was applied to KROTOS experiments at JRC Ispra with alumina and corium melts, as well as to a prototypic g…
A novel dissolution method was developed, suitable for powder mixtures, based on the USP basket apparatus. The baskets were modified such that the powder mixtures were retained within the baskets and not dispersed, a potential difficulty that may arise when using conventional USP basket and paddle apparatus. The advan…
The reaction of anhydrous CuCl2 with HCl and 2-amino-5-iodopyridine in 1-propanol resulted in two polymorphs of (5-IAP)2[CuCl4] [5-IAP = 2-amino-5-iodopyridinium], one as red rods (1) and one as orange prisms (2). The two polymorphs have been characterized by single crystal x-ray diffraction and variable temperature m…
Hemicellulosic succinates with a degree of substitution ranging from 0.28 to 1.67 were prepared by modification with succinic anhydride using pyridine as catalyst and N, N-dimethylformamide/lithium chloride system as solvent. Variations in reactant molar ratio from 1:1 to 6:1 and reaction time from 1 to 12 h resulted…
The objective of this study was to investigate the effects of types of motion and loading conditions on the wear of Pressurized Water Reactor (PWR) fuel rod cladding made of Zircaloy-4 in contact with a grid support cell. Fretting-wear tests, for various combinations of motion and preload, were conducted at 310°C and…
We have investigated the spin-crossover behavior for one-dimensional complexes [Fe(trz) 3 (RSO 3 ) 2 (trz= triazole) and two-dimensional mixed-valence complexes (C n H 2n+1 ) 4 N[Fe II Fe III (dto) 3 ](dto=C 2 O 2 S 2 ). For the case of [Fe(4-NH 2 trz) 3 ](RSO 3 ) 2 , we have controlled Tc and the thermal hysteresis w…
SUMMARIES The effect of the deacidification spray CSC Book Saver ® on a mechanical pulp paper and a pure cellulose paper was tested and the consumption of the magnesium based alkaline reserve over time was simulated by exposing the papers to nitrogen dioxide. Scanning electron microscopy and energy dispersive X-ray an…
The transformation and crystallization behaviors of the polymorphs (A and C) and solvated crystals (BH (BPT·0.5H2O) and D (BPT·MeOH)) of the thiazole-derivative pharmaceutical (BPT) were investigated. The solubility of metastable form was measured with the vigorous stirring using a magnetic stirrer. It was found that…
The do-undo methods adopted in conventional leather processing generate huge amounts of pollutants. In this context pickle-less chrome tanning is becoming crucial to the tanners due to these environmental problems. However, a standard process with optimal pH and other parameters especially the need and the amount of m…
The etching of Ti in HF-free solutions was investigated. Kinetic experiments were performed to tailor the etch rate within a range that is technologically interesting for etching thin (≈5 nm) Ti adhesion layers. Electrochemical measurements were used to characterize the etching process; galvanic element formation betw…
Understanding the reasons for variability in D uptake in Canadian Deuterium Uranium (CANDU) reactor Zr-2.5Nb pressure tubes (PT)s will lead to improved surveillance and predictive strategies. Results from out-reactor aqueous exposures that suggest PT performance should be predictable based on offcut characteristics an…
We studied the elastic constant tensor for Pb(Ti0.5Zr0.5)O3, in the rhombohedral and tetragonal phases. Young’s modulus in the rhombohedral phase is very anisotropic. It has two narrow and large peaks along and perpendicular to polarization direction and is small in all intermediate directions. Tetragonal PZT is soft…
An introductory survey of the theoretical ideas and calculations and experimental results which depart from Landau Fermi liquids is presented. The common themes and possible routes to the singularities leading to breakdown of Landau Fermi liquids are categorized following an elementary discussion of the theory. Solubl…
International audience
NKK has developed a high-strength pearlitic rail named the SP (Super Pearlite) rail, which has superior wear and damage resistance and is most suitable for heavy haul railroads. Comprehensive research on the relation between microstructural factors and wear and RCF (Rolling Contact Fatigue) behaviors revealed that ref…