Materials Literature
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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…
NAD is an indispensable redox cofactor in all organisms. Most of the genes required for NAD biosynthesis in various species are known. Ribosylnicotinamide kinase (RNK) was among the few unknown (missing) genes involved with NAD salvage and recycling pathways. Using a comparative genome analysis involving reconstructio…
A luminescent film with terbium-complex-bridged polysilsesquioxanes has been prepared by sol-gel processing of a new bifunctional monomer that combines the role of a sol-gel molecular precursor with a Tb3+ ion coordinate donor. The emission from Tb3+ ion due to ligand-to-metal energy transfer was observed by UV excita…
Abstract In this article we describe our continuing research on a novel nanocomposite approach for reducing gas permeability through biomedical polyurethane membranes. Nanocomposites were prepared using commercially available poly(urethane urea)s (PUU) and two organically modified layered silicates (OLS). Wide‐angle X…
Variable angle reflectance FTIR spectroscopy was used to investigate the optical properties of indium tin oxide (ITO) and fluorine-doped tin oxide (SFO) thin films in the near-IR spectral region. The reflectance data were used to determine the plasma frequency and the electronic scattering time using the Drude free-el…
The architecture of three-dimensional interconnecting self-organized nanofiber networks from separate needlelike crystals of L-DHL (lanosta-8,24-dien-3beta-ol:24,25-dihydrolanosterol = 56:44) in di-isooctylphthalate has been achieved for the first time, on the basis of the completely new concept of branching creation…
Lactose molecules were installed on the surface of poly(ethylene glycol)-poly(d,l-lactide) (PEG-PLA) block copolymer micelles in the scope of seeking specific recognition by cell surface receptors at hepatic sites. This, in turn, is expected to result in the formation of a complex displaying prolonged retention times…