Low-temperature sintering of BaZrO3 and BaCeO3 barrier materials
BaCe0.99Y0.01O3–δ ceramics with a density over 95% was obtained by free sintering at 1000 ̊C using a combination of a fine precursor powder with a melt-forming sintering aid.
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Fatigue Strength of Ferritic Ductile Cast Iron Hardened by Super Rapid Induction Heating and Quenching
To clarify the effects of Super Rapid Induction Heating and Quenching (SRIHQ) on fatigue properties of Ferrite Ductile Cast Iron (FDI), rotational bending fatigue tests were carried out on specimens treated with four types of heating cycle. Results showed that; (i) the SRIHQ process generated a thin dark gray area aro…
A crystallographic, EPR and theoretical study of the Jahn–Teller distortion in [CuTp 2 ] (Tp − = tris{pyrazol-1-yl}hydridoborate)
Crystals of the title compound (1) contain two independent, centrosymmetric half-molecules per asymmetric unit. While both of these show Jahn-Teller elongated six-coordinate geometries, the lengths of the elongated Cu-N bonds in the two molecules differ by 0.117(2) A at 30 K. The structure of one of these molecules (m…
Combinatorial pulsed laser deposition and thermoelectricity of (La1−xCax)VO3composition-spread films
La1–xCaxVO3 composition-spread film library was fabricated by combinatorial pulsed laser deposition and their thermoelectric properties were evaluated paralelly by the multi-channel probes of Seebeck coefficient and electric conductivity. Concurrent X-ray analysis verified the formation of solid soluted films in the f…
The structure of poly(ethylene oxide)8 : NaBPh4 from a single crystal oligomer and polycrystalline polymerElectronic supplementary information (ESI) available: powder diffraction data for PEO8 : NaBPh4. See http://www.rsc.org/suppdata/cc/b3/b311800b/
We show that the structure of a polymer electrolyte may be solved by growing single crystals of an oligomeric (short chain) complex which provided an adequate starting model for refinement of the equivalent polymeric structure using powder diffraction: the efficacy of this method has been demonstrated by determining f…
Laboratory and Homework Exercises in the Geochemical Kinetics of Mineral-Water Reaction: Rate Law, Arrhenius Activation Energy, and the Rate-Determining Step in the Dissolution of Halite
This exercise for mineralogy/geochemistry courses uses optical microscopy to measure the grain sizes of equant halite crystals, and the time for complete dissolution of each grain. The required equipment is readily available in most science departments: microscopes, thermometers, stopwatches, glassware, and table salt…
Advanced Oxide Material Systems for 1650 Deg. C Thermal/Environmental Barrier Coating Applications
Advanced thermal and environmental barrier coatings (TEBCs) are being developed for low- emission SiC/SiC ceramic matrix composite (CMC) combustor and vane applications to extend the CMC liner and vane temperature capability to 1650 degrees C (3000 degrees F) in oxidizing and water-vapor-containing combustion environm…
Study On Application Of Alumina In High-Purity Andalusite Based Refractory
Effects of some kinds of alumina on physical properties of high-purity andalusite based refractory were studied, and, effects of type and amount of added alumina on phase composition and microstructure of the refractory were investigated by XRD and SEM. The results revealed that the sintering property of the refractor…
Stress Relaxation in Powder Metallurgy Superalloy Disks
The objective of this study was to assess the relaxation of stresses at increasing temperatures in several PM superalloy disks. The effects of temperature, time, and plasticity were examined.
ACHNANTHIDIUM ATOMOIDES SP. NOV., A NEW DIATOM FROM THE GRAND-DUCHY OF LUXEMBOURG
International audience
Surface and Interfacial Characterization of Wood-PVC Composites: Thermal and Dynamic Mechanical Properties
Maleation significantly influenced thermal and dynamic mechanical properties of resultant wood-PVC composites. Experimental results indicated that storage modulus (E′) and complex modulus (E*) increased with increase of maleated polypropylene (MAPP) retention at low MAPP retention for both E-43 and G-3015, but leveled…
Progress and effectiveness of structural models of carbons
Recent progress of structural models of carbon materials is reviewed by the classification of structures into nano, and mesoscopic views. The graphitic materials are viewed on the basis of the structural units of hexagon plane, graphite crystal, nano, meso, and macroscopic structural units. Novel 3-dimensional models…
ENHANCEMENT OF CHITIN’S DEGREE OF DEACETYLATION BY MULTISTAGE ALKALI TREATMENTS
was carried out with 5 wt% NaOH at 90°C in a nitrogen atmosphere.Chitosan was prepared with high degree of deacetylation. The effect of deacetylation conditions in the multistage alkali treatments in comparison with continuous alkali treatment was studied. Chitosan’s nitrogen content and the extent of degree of deacet…
Parametrical analysis of a tubular pressurized SOFC
High temperature fuel cells of the solid oxide type (SOFC) are simple electrochemical devices that operate at 1000 o C and are capable of con- verting the chemical energy of natural gas to AC electric power at approxi- mately 55-60% efficiency (net AC/LHV in atmospheric pressure). In this paper, a zero-dimensional mod…
Hiral effects of single‐wall carbon nanotube fluorination and hydrogenation
Abstract The results of calculations of the electronic and energy characteristics of atomic hydrogen and fluorine adsorption processes on an external surface of single‐wall hiral carbon nanotubes (n,m) are represented. Molecular cluster model within a framework of quantum chemical semiempirical schemes modified neglec…
A Comparison of PZT-Based and TiNi Shape Memory Alloy-Based MEMS Microactuators
Microactuators based on PbZr1-xTixO3 (PZT) and TiNi shape memory alloys (SMAs) are compared using microelectromechanical systems (MEMS) micropumps and microvalves as typical devices. The advantages of PZT-based microactuation include large actuation forces and high operating frequencies, leading to high operating pres…
Rubidium doped zeolite rho: structure and microwave conductivity of a metallic zeolite
Large crystallites of high purity zeolite rho were synthesized by controlled monitoring of the aging and heating period of the mother gel. The microwave conductivity of Rb-rho doped with up to 20 Rb atoms per unit cell was measured over the temperature range 15-300 K, and the structures of three of the samples were ex…
Plasma Modification of Porous Low-k Dielectrics
The effect of CF 4 / O 2 -based plasma treatment on two types of porous low dielectric constant (low- k ) materials was investigated. For the microporous film, the surface appears to be sealed, most likely by the formation of a silicon oxide-like layer within 5 s of treatment. For both microporous and mesoporous mater…
Bullet Impact on Steel and Kevlar®/Steel Armor: Computer Modeling and Experimental Data
Computer hydrocode analyses and ballistic testing have been used to investigate the effectiveness of steel plate armor against lead/copper bullets commonly available in the U.S. and across the world. Hydrocode simulations accurately predict the steel plate thickness that will prevent full penetration as well as the im…
Synthesis and molecular structures of nitrosoarene metalloporphyrin complexes of ruthenium
Several new ruthenium porphyrins containing nitrosoarene ligands have been synthesized and characterized by IR and (1)H NMR spectroscopy, and by single-crystal X-ray crystallography. Bis-nitrosoarene complexes of the form (por)Ru(ArNO)(2)(Ar = aryl group; por = TPP, TTP; TPP = tetraphenylporphyrinato dianion, TTP = te…