Materials Literature
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As a fundamental study to develop a new process for eliminating detrimental elements and for recovering valuable ones from secondary Cu-Fe base alloys with a considerably high content of arsenic, both the phase relations in a miscibility gap of the Cu-Fe-As system saturated with carbon and the distribution of some min…
Poly[3-(oligoethylene oxide)-4-methylthiophene] is doped by HCl in aqueous solution in the absence of oxygen and undergoes dramatic solvatochromism in water-ethanol mixtures.
Thermal cross‐linking of poly(vinyl methyl ether) (PVME) in the absence of cross‐linking agent, was detected rheologically. The linear viscoelastic properties of PVME were found to be greatly changed by the onset of the cross‐linking process. The viscoelastic material functions, such as dynamic shear moduli, G′ and G″…
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.
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…
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…
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…
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…
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 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…
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…
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.
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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…
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…
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…
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…
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…
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…
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…