Approximate inertial manifolds for the pattern formation Cahn-Hilliard equation
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Transverse dipole association and negative dielectric anisotropy of nematic liquid crystals
Measurements are reported of the dielectric properties of three laterally substituted dicyano compounds with large molecular dipole moments perpendicular to the long molecular axis. Results are given for the materials in solution, in the isotropic liquid state, and for one compound in the nematic state. There is evide…
Solubility and density isotherms for potassium sulfate-water-2-propanol
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility and density isotherms for potassium sulfate-water-2-propanolJerzy Mydlarz, Alan G. Jones, and Angel MillanCite this: J. Chem. Eng. Data 1989, 34, 1, 124–126Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published inissue 1 Ja…
Lithium Uptake and the Accelerated Corrosion of Zirconium Alloys
The corrosion of zirconium alloys in aqueous lithiated solutions is sensitive to the concentration of the alkali and the temperature. In concentrated solutions, ⪢10-1 M in lithium hydroxide (LiOH) (700-ppm lithium) and at temperatures >573 K, accelerated corrosion occurs at quite an early stage. Our investigati…
Effect of axially bound anions on the electroreduction of tin(IV) porphyrins in tetrahydrofuran
The spectroscopic characterization and electrochemistry of SnL(X)2 is presented where L is the dianion of tetra-p-tolylporphyrin or tetra-m-tolylporphyrin and X is ClO4–, Br–, Cl–, F–, or OH–. In all cases, electroreduction leads to porphyrin π anion radicals and dianions which were characterized in tetrahydrofuran by…
Commercial fatty acid ethoxylates as corrosion inhibitors for steel in pickling acids
Corrosion inhibitors have been prepared by ethoxylation of four commercially available unsaturated fatty acid mixtures: tall oil, soya bean oil, cotton seed oil, and linseed oil. The compounds obtained have the general formula R–COO–(CH 2 CH 2 O) n –H, where R is mainly a mixture of C 17 H 29 , C 17 H 31 , and C 17 H…
Synergistic abrasive—corrosive wear of chromium containing steels
Commercial and experimental steels containing various chromium concentrations have been assessedfor their resistance to the combined effects of abrasion and corrosion. The degree of work hardening and macro- and microtoughness of low carbon martensite alloys, dual phase alloys, and metastable austenitic alloys provide…
Intercalation mechanism of nitrogenated bases into V2O5 xerogel
It has been shown by i.r. and XPS techniques that protonation of nitrogenated bases (ammonia, pyridine and pyrazine) is the major process that occurs on adsorption of these compounds in the intracrystalline environment of V2O5· 1.5 H2O xerogel. At room temperature the intercalation process takes place mainly by a prot…
Crack Growth Resistance of Textured Alumina
The crack growth resistance of a textured, extruded alumina body was compared with that of an isotropic, isopressed body of similar grain size, density, and chemistry. R ‐curve levels reflected the preferred orientation; however, R ‐curve slopes ( dK IR / d Δ a ) were the same in all instances, implying a similar crac…
Energy absorption in the failure of ceramic composite armours
On etudie les mecanismes d'absorption d'energie lors de la perforation de boucliers composites ceramiques, incluant la rupture de la ceramique, la deformation du materiau ductile servant de support et du projectile lui-meme, et l'energie cinetique des fragments residuels et du support
Effect of Microstructure on Thermal Conductivity of AlN Ceramics
The high thermal conducting mechanism of AlN ceramics has been investigated by the relationship between microstructure and thermal conductivity of the samples which were obtained by pressureless-sintering at 1900°C for 1-24h with Y2O3 2 at% addition as a sintering aid. The thermal conductivity increased gradually with…
Algal identification using in vivo fluorescence spectra
Replicate excitation spectra of the fluorescence emission at 680 nm from 30 cultures of freshwater algae have been compared to determine the most sensitive regions for the differentiation of algal species. Spectra were normalized in four different ways prior to analysis in order to simulate different experimental appr…
A Mossbauer study of CoMo-substituted barium ferrite
Well-resolved Mossbauer spectra were obtained for CoMo-doped barium ferrite with variable doping (0-33% Fe), heat-treatment temperature (825-1200 degrees C), and sample temperature (90-300 K). Substitution was observed to occur primarily on the 12-K site, with little or no lattice distortion. A fitting model using fiv…
Geometric study of a 2D tiling related to the octagonal quasiperiodic tiling
A quasicrystal built with three types of tiles is related to the well-known octagonal tiling. The relationships between both tilings are investigated. More precisely, we show that the coordinates of the vertices can be obtained in two different but equivalent ways. The structure factor is calculated exactly. We emphaz…
Small polarons and polaron transitions
The Mott–Littleton method is used mainly for ionic defects in polar crystals, yet it provides a powerful tool for small polarons. These electronic carriers, important in many halides and oxides, cause a substantial self-trapping distortion, and move by an incoherent thermally activated hopping motion.The Mott–Littleto…
Synthesis of hydroxo-organo-complexes of the nickel group elements
The considerable nucleophilicity of the OH bridges in the new hydroxo complexes [(C6F5)2M(µ-OH)2M(C6F5)2]2–(M = Ni, Pd, Pt) is indicated by high field proton resonances and the formation of µ-pyrazolate derivatives from [(C6F5)Ni(µ-OH)2Ni(C6F5)2]2–.
Oxidative dimerization of methane over well defined lithium-promoted magnesium oxide catalysts
Pure MgO samples having greatly different morphologies and lithium-promoted catalysts derived from these materials have been examined by electron microscopy. In addition, their ability to generate and react with gas-phase methyl radicals has been determined using e.s.r. in combination with a matrix-isolation technique…
Contamination performance of polymeric insulating materials used for outdoor insulation applications
Results of a laboratory evaluation of the contamination performance of silicone rubber and EPDM (ethylene propylenediene monomer) rubber polymers are presented. it is shown that due to significant material differences, these polymers cannot be evaluated using experimental conditions standardized for porcelain and glas…
In vitro substance loss due to galvanic corrosion in Ti implant/Ni-Cr supraconstruction systems.
To characterize the galvanic corrosion of supraconstructions consisting of Ni-Cr alloys that come in contact with titanium implants, the resultant substance loss was determined. The measurement of the released substance masses was conducted by analysis of the electrolyte solutions with the aid of atomic absorption spe…
The structure of calomel, Hg2Cl2, derived from neutron powder data
Hg 2 Cl 2 , M = 472.1 Daltons, tetragonal, I 4/ mmm , a = 4.4795(5) Å, c = 10.9054(9) Å, V = 218.83(8) Å 3 , Z = 2, D c = 7.162 g cm −3 , λ (neutron) = 1.893 Å, R B = 0.026, R P = 0.043. The structure of Hg 2 Cl 2 was refined using the Rietveld profile fitting technique on neutron powder data. Parameters obtained were…