Materials Literature
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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…
The spontaneous oxidation of crystallized ZrAu at room temperature leads to the formation of ultrafine monoclinic zirconia (MZ) particles (about 3.6 nm in diameter). The presence of tetragonal phase (TZ), generally observed in very small zirconia particles, was investigated by X-ray diffraction and Raman experiments b…
Oil-filled nanocapsules were synthesized using the oil droplets of an O/W microemulsion as templates. A polysiloxane/silicate shell was formed at the surface of the oil droplet by cross-linking n -octadecyltrimethoxysilane and tetramethoxysiloxane. The shell imparted stability to the oil droplets against coalescence.…
Recently, Johansson and co-workers provided the first direct evidence for the existence of nonfluorescent bodipy (4,4-difluoro-1,3,5,7-tetramethyl-4-bora-3a,4a-diaza-s-indacene) H dimers in double-labeled proteins and fluorescent J dimers in labeled lipid vesicles (Bergstrom, F.; et al. J. Am. Chem. Soc. 2002, 124, 19…
This paper reports the results of a study of the effect of nitrogen on the optical properties of dislocations in nitrogen-doped Czochralski and nitrogen-doped float zone silicon samples where the nitrogen doping was carried out by adding Si 3 N 4 in the molten silicon charge or by nitrogen gas dissolution. Dislocation…
Thin-film microstrip lines with a polymer dielectric between ground and signal conductor are proven to be an attractive alternative to coplanar waveguides for (sub)-MM-wave interconnects. Both simulation and electrooptic characterization reveal negligible modal dispersion up to 1000 GHz and low attenuation even if the…
Materials with the skutterudite crystal structure possess attractive transport properties and have a good potential for achieving ZT values substantially larger than for state-of-the-art thermoelectric materials. Studies conducted at JPL on CoAs/sub 3/, RhAs/sub 3/, CoSb/sub 3/, RhSb/sub 3/ and IrSb/sub 3/ have shown…
The chemical effects of ultrasound originate from acoustic cavitation, which produces extremely energetic local transient conditions. In cavitating clouds of bubbles, both sonochemistry and sonoluminescence occur. Spectroscopic analysis of sonoluminescence from hydrocarbons and from metal carbonyls reveal temperatures…
A permeation study using bare Ba0.5Sr0.5Co0.8Fe0.2Ox membranes shows that stable oxygen fluxes are only achieved when operating the membrane at temperatures higher than 1023 K and indicates therefore that short contact time membrane reactors will be most suitable for future upgrading of light hydrocarbons.
Nitrogen limitation induces the nitrogen-regulated (Ntr) response, which includes proteins that assimilate ammonia and scavenge nitrogen. Nitrogen limitation also induces catabolic pathways that degrade four metabolically related compounds: putrescine, arginine, ornithine, and gamma-aminobutyrate (GABA). We analyzed t…