Materials Literature
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In this paper, the authors propose a calculation method for the compensating current reference of an active power filter, where a nonlinear load exists in a three-phase three-wire unsymmetrical voltage system. This new method has been named the extension pq method. The authors have experimented with the extension pq m…
A transition-metal oxide NaCo/sub 2/O/sub 4/ system has been synthesized by a standard solid-state reaction method, and the thermoelectric properties have been measured. The resistivity /spl rho/ and the thermoelectric power /spl alpha/ of the as-sintered NaCo/sub 2/O/sub 4/ is 2 m/spl Omega/cm and 100 /spl mu/V/K at…
Partial discharges are a symptom of most of the stator winding insulation deterioration mechanisms found in motors and generators rated 6 kV or more. Thus, partial discharge testing has been used for over 40 years as a means of determining the maintenance requirements of such high voltage stators. As the benefits of s…
In flip-chip packaging, an underfill mixture is placed into the chip-to-substrate stand-off created by the array of solder bumps, using a capillary flow process. The underfill mixture is densely filled with solid silica particles to achieve the desired effective coefficient of thermal expansion. Thus, during the flow…
One-pot reaction between the dinuclear [MnII2(bpym)(H2O)8]4+ complex and the mononuclear [MIV(CN)8]4− unit (M = Mo and W; bpym = 2,2′-bipyrimidine) in aqueous solution yields the novel heterobimetallic complexes of formula {(μ-bpym)[Mn(H2O)]2-(μ-NC)6M(CN)2} with M = Mo (1) and W (2). 1 and 2 are isostructural three-di…
This paper provides analytical and graphical tools for the study, performance evaluation and design of the popular carrier based PWM methods which are widely employed in PWM VSI-fed AC motor drives. Simple techniques for generating the modulation waves of the high performance PWM methods are described. The two most im…
We present adsorption isotherm results for Ne, CH4, and Xe on bundles of close-ended single-wall carbon nanotubes, for coverages above the completion of the first layer. We find a small, sharp, substep present in the second-layer data for Ne and CH4, and a weaker feature, that produces an isothermal compressibility pe…
The purpose of this study is to gain insight into the instability which is observed, under operative conditions, in SnO 2 nanocrystalline materials. To this end, the binding and fragmentation energies of SnO 2 crystalline grains have been evaluated quantum mechanically at the semi-empirical level using the extended De…
Research on the use of shape memory alloy actuators for miniature applications is interesting due to their high power-to-weight ratio and self-sensing capabilities based on resistance-strain models. Hysteresis behaviour in addition to slow cooling response makes the control a major problem to be addressed. This work i…
This paper demonstrates the effects of a laminated busbar on power electronics circuits, and compares its characteristics to those of other power distribution topologies. Included in the discussion are physical as well as electrical characteristics, along with the manufacturing implications that need to be considered.
A simulator is developed to model and design high strain shape memory alloy (SMA) tension actuators. The simulator may be used predict characteristics of a given actuator, or to design its geometry under specifications such as force, speed, stroke and size. The accuracy of the model is verified experimentally in refer…
Previous work by the authors has involved producing a non-linear conductivity characteristic in a thermoset polymer (polyester) by the introduction of particulate ZnO. This work has now been extended to cover a thermoplastic material (LDPE). Filler/resin ratios have been varied to obtain a critical level at which the…
Surface (air−fluid) and interfacial (fluid−fluid) tensions of coexisting isotropic and anisotropic aqueous suspensions of microcrystalline cellulose have been investigated as a function of suspension concentration and ionic strength using the pendant drop method. The surface tension of the individual phases remained c…
A geometrical model of a porous silicon structure is proposed. The resulting size distribution spectra are analyzed by their relation to photoluminescence and Raman scattering. Both experimental data are investigated and compared to those results. The model well describes the presence of a low-energy part of the photo…
Abstract We fabricate a 25.5‐μm‐thick monocrystalline Si solar cell with a confirmed power conversion efficiency of 15.4% and an area of 3.88 cm 2 using a layer transfer process with porous Si. The process is free of photolithography and contains no high‐temperature oxidation steps. We investigate three design feature…
A new thermal reference model provides the foundation for a more flexible approach to design and optimization, forcing uninterrupted coherence between electromagnetic behavior and predefined thermal conditions. Design and optimization of HF magnetic components usually involves a number of trade-offs between performanc…
A new thermal model is introduced which is based on unique references, specifically suited to design and high frequency high power magnetic components. This thermal reference model is independent of shape, size and orientation, so that a general set of data may be used to optimize transformer structure. The model, its…
Abstract Porous membranes were prepared through the thermally induced phase separation of poly(ethylene‐ co ‐vinyl alcohol) (EVOH)/glycerol mixtures. The binodal temperature and dynamic crystallization temperature were determined by optical microscopy and differential scanning calorimetry measurements, respectively. I…
The DtxR protein is a global iron-dependent repressor in Corynebacterium diphtheriae that regulates transcription from multiple promoters. A search of the partially completed C. diphtheriae genome identified a gene, mntR, whose predicted product has significant homology with the DtxR repressor protein. The mntR gene i…
This work presents a study of the quantification of the benefits that can be achieved by applying interleaving techniques between different layers (interlayer effect) and in the same layer (intralayer effect). A method to estimate the leakage inductance is also introduced in this work. This method allows the designer…