Materials Literature
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A new ferrite-ceramic composite material with inductive, capacitive, and impedance properties was fabricated by a solid-state reaction. The composite materials were prepared with ferromagnetic NiCuZn ferrites and ferroelectric BaTiO/sub 3/ perovskite. Co/sup 2+/, Bi/sup 3+/, Y/sup 3+/, Dy/sup 3+/, and Ca/sup 2+/ ions…
Corona discharge mechanism and breakdown voltage characteristics of air gaps in the presence of metallic particles were investigated including the relationship between the corona discharge mechanism and the phase resolved partial discharge patterns. These results are of interest for detection of foreign particles in g…
Abstract Grain boundary mobility has been measured in high-purity aluminum alloyed with 0.03 wt.% Zr using energy stored during plastic deformation as a driving force. In general, the dependence of mobility on grain boundary character was similar to that observed by previous authors with a maximum in mobility in the v…
The effect of an external magnetic field (up to 0.8 T) on the anodic dissolution of microstructures has been investigated systematically. Copper and silver wires (100 microm in diameter) were embedded in epoxy resin and dissolved potentiostatically while a magnetic field was periodically switched on and off. A special…
Spectral properties and photochromic behavior of a series of novel 1',3',3'-trimethyl-1,2-tetramethylenespiro[7H-furo(3,2-f)-(2H-1)-benzopyran-7,2'-indolines] 1-4 have been studied. The mechanism of the photoinitiated ring-opening reaction involves the formation of an acoplanar cis-cisoid intermediate, the lifetime of…
This paper presents a nonlinear control scheme for deflection control of a flexible beam using shape memory alloy (SMAs) actuators. These actuators possess interesting properties in terms of force generation capacity, possibility of miniaturization, and power consumption. However, their use in precision applications i…
Experimental and modeling studies of the gas-phase chemistry occurring in dilute, hot filament (HF) activated B2H6/H2 and B2H6/CH4/H2 gas mixtures are reported. Spatially resolved relative number densities of B (and H) atoms have been measured by resonance enhanced multiphoton ionization methods, as a function of proc…
Cu 2 O nanoparticles with diameters in the range 6.0-8.6nm were prepared by a chemical method. Both dc and ac electrical properties were measured on a compacted nanoparticle assembly. dc electrical resistivity in the temperature range 140-300K was found to arise due to a variable range hopping conduction mechanism. Th…
This paper first investigates the correlation between acoustic signals and electric power-source signal angles using ultrasonic detection technique. This paper then compares said acoustic signals' three-dimensional patterns with their polar-coordinate patterns and, with angle-zones established, provides a new analyzin…
Intrinsic /spl alpha/-damping constants of Co/sub 2/MnAl Heusler alloy films prepared by magnetron sputtering were investigated. After deposition of Co/sub 2/MnAl films, the films were annealed at 200-400/spl deg/C to control the crystal structure and the atomic order between Co, Mn, and Al sites. Ferromagnetic resona…
Abstract Carbonate-intercalated layered double hydroxides of Co(II) and Ni(II) with Fe(III) and Al(III) were precipitated under different conditions (pH = 8–12; T = 25–80°C). All the samples are replete with stacking faults which are not eliminated by post-precipitation hydrothermal treatment (80–180°C, 18 h). DIFFaX…
Les particules de mineraux du groupe du platine (MGP) sont presentes en grand nombre dans les alluvions des rivieres drainant la partie orientale du complexe de Bushveld, en Afrique du Sud. Environ 32% d'un total de790 pepites de MGP, mesurant entre 50 et 1600 μm, font preuve de modifications chimique ou texturale. Le…
We report detailed synthesis studies of large-scale fabrication of single-crystalline cobalt nanorods using thermally evaporated gold as a conducting electrode on a nanoporous anodized aluminum oxide (AAO) template. By varying the time (i.e., adjusting the current density), it is possible to control the length of the…
Abstract Tetranuclear lanthanide clusters of composition [Ln 4 ( μ 3 ‐OH) 2 (Ph 2 acac) 10 ] (Ln = Pr, Nd, and Sm) (Ph 2 acac = dibenzoylmethanide) were prepared starting from [LnCl 3 ·(n H 2 O)] (n = 6, 7) with 2.5 equivalents dibenzoylmethane in presence of triethylamine. Single crystals X‐ray analyses of compounds…
Abstract For a series of mixed-layer illite-smectite (I-S) minerals from a drillhole near the Kakkonda geothermal field, one-dimensional structure analysis by X-ray diffraction (XRD) was performed using Casaturated specimens in both air-dried and ethylene glycol-solvated states. The expandability characteristics of co…
Pyrochlore-type (A 2 B 2 O 6 O’) ceramics are considered for the immobilization of highly radioactive waste. Understanding the alteration process of such potential nuclear waste form materials in aqueous media is critical for the prediction of their long-term stability in a nuclear repository. Current models on pyroch…
A molecular modeling approach is used to study the stability of different polymorphic forms of l-glutamic acid through building and optimizing molecular clusters of different sizes and shapes with the latter corresponding to the predicted crystal growth morphologies. The results reveal that the initially nucleating (a…
Western blot analysis is a widely used technique for protein immunodetection. Its current format, however is unsuitable for multiplex detection of proteins, primarily due to intrinsic limitations of standard organic dyes employed as probes. Quantum dot (QD) semiconductor nanoparticles exhibit significant advantages ov…
The introduction of combination chemotherapeutic regimens for the treatment of childhood leukaemia in the 1960s provided the proof-of-principle that cytotoxic drugs were capable of curing cancer. However, in the four decades since this discovery, the majority of cancers still cannot be cured by chemotherapy. Clinical…
Alternating polyelectrolyte “layer-by-layer” deposition has been used to create emissive thin films of a weakly anionic, nonaggregating poly(phenylene ethynylene) on silica microspheres. The resulting particles are smooth and emit fluorescence solely from the outside polymer-coated surface. Suspensions of the coated m…