Materials Literature
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The structural change in electron-irradiated graphite was examined at elevated temperatures by means of TEM, HREM and ELNES. Above ∼650 K irradiation the electron diffraction patterns gradually turned into sharp Debye-Scherrer rings, in contrast with the formation of diffuse halo rings at lower temperature irradiation…
A copoly (DL-lactic/glycolic acid) (PLGA), with a weight-average molecular weight of about 8400, has been characterized using fast atom bombardment (FAB)-tandem mass spectrometry in order to determine the sequence. Because of the large molecular size, PLGA was partially hydrolyzed and the terminal hydroxyl groups in t…
We have observed the behaviour of chiral nematic droplets with positive dielectric anisotropy subjected to electric fields. With increasing field, the Frank-Pryce spherulitic director configuration is distorted progressively into a quasi-cylindrical spiral twist wall. As the field increases further this wall progressi…
The solubility of oxygen in solid and liquid neodymium, were measured by the solid state electrotransport and metal-oxide equilibrium methods, are determined as follows: Solubility in solid neodymium; log (CO /mass %) Nd (α) = -1760 (± 20)T-1/ K-1) + 0.65 (± 0.02) (1,023 ∼ 1,123 K) log (CO /mass %) Nd (β) = -1850 (± 3…
The mono- and di-metallic N6-ruthenium(II) complexes [Ru(terpy)L][PF6]2 1 and [{Ru(terpy)}2L][PF6]4 2, where L is 2,3-bis(2,2′-bipyridin-6-yl)pyrazine and terpy is 2,2′∶6′,2″-terpyridine, have been prepared. Extensive and careful 1H and 13C NMR spectroscopic studies at ambient temperature showed that complexation indu…
Traditional test methods to provide information on the condition of insulation between core laminations of large rotating electrical machines require a substantial supply to excite the core at rated magnetic flux, temperature rises due to faults being detected by various means. The test is performed with the rotor rem…
In this paper, the design and dynamics of a new Shape Memory Alloy (SMA) actuator that possesses impressive payload lifting capabilities are presented. This actuator consists of 48 SMA wires mechanically bundled in parallel forming one powerful muscle. The new actuator can lift up to 100 lbs., which is approximately 3…
The tetragonal-to-monoclinic phase transformation of 3mol% and 4mol% Y2O3-doped ZrO2 (Y-PSZ) was investigated by annealing at 140°C in hot water. Sintered bodies of 3Y-PSZ and 4Y-PSZ were prepared by sintering at 1350°C for 0-10h, in air, and sintering at 1400 or 1450°C, respectively. A 3mol% and 4mol% Y-PSZ fine powd…
a-(Benzotriazol-I-yl)alkyl ethers were prepared in synthetically useful yields by direct reaction of the corresponding ethers with Nchlorobenzotriazole in the presence of Lewis acids.
Tablets manufactured from micronized anhydrous nitrofurantoin exhibited unsatisfactory dissolution properties, whereas excellent results were obtained with unmilled drug material having fine particle size.
A wide-band (102 − 2 × 1010Hz) dielectric study of epoxy compounds was carried out under isobaric conditions (atmospheric pressure) by changing the temperature down to the supercooled and glassy phases. One of these systems (diglycidyl ether of bisphenol A (DGEBA)) was also measured under isothermal conditions at 293…
A theoretical analysis nas been made, in terms of the spectral density, of plane-wave vibrational modes propagating in disordered solids. The Ioffe-Regel crossover freauency for vitreous silica has been found to be ≃1 THz for both longitudinal and transverse waves. The analytic results agree well with the results obta…
A Ti-50.7 at % Ni shape memory alloy was welded by friction welding process at several upsetting pressures. The characteristics of individual phase which relates to shape memory phenomena and mechanical properties in a weld metal was investigated and discussed.Weld metal microstructures were identified using a transmi…
New kinds of modified electrodes have been prepared on the basis of electroactive polymers containing bimetallic ‘anil’ and ‘salen’-type complexes. New tetrahydro ‘anil’ ligands and complexes have been synthesized, giving birth to a new family of electroactive polymers. The polymers have been prepared potentiostatical…
Doubly functionalized 4,6-bis(6-(2,2'-bipyridyl))pyrimidine ligands based on pyridine and pyrimidine units were synthesized starting from a commercially available nicotinic acid derivative using Stille-type carbon_carbon bond-forming reactions. The resulting hydroxy-terminated ligand, functionalized at the terminal py…
Molecular modeling techniques have been used to study the adsorption and film formation of N-containing corrosion inhibitors on hematite (Fe{sub 2}O{sub 3}) and magnetite (Fe{sub 3}O{sub 4}) surfaces. In oilfield applications as temperature and carbon dioxide partial pressure vary, different corrosion products are for…
The advances of ladle metallurgy have led to very significant developments in the internal cleanliness of low alloy steel products. This development, which started with the design of the first functioning ladle furnaces with effective stirring facilities, has now reached a level where “standard” produced steels outper…
Partial discharge monitoring is an effective on-line predictive maintenance test for motors and generators at 4160 volt and above, as well as other electrical distribution equipment. The benefits of on- line testing allow for equipment analysis and diagnostics during normal production. Corrective actions can be planne…
High-resolution core-level and valence band x-ray photoemission spectroscopy measurements were performed on perovskite oxide powders synthesized for applications in solid-oxide fuel cells by high-temperature solid-state reaction ( x = 0.3 and 0.19) and by room-temperature mechanical activation of the precursors ( x =…
Distortion of metal frameworks for the ceramic fused to metal technique during firing is attributed to thermal creep of the alloys. Usually thermal creep measurements are performed at constant load and constant temperature over varying time periods. Because metal frameworks for the ceramic-fused-to-metal technique are…