Materials Literature
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The synthesis of a double-cavity porphyrin with interesting allosteric binding properties toward viologens (N,N'-disubstituted 4,4'-bipyridines) is described. The porphyrin host forms very strong 1:2 complexes with viologens, displaying a negative allosteric behavior. The first viologen guest binds exceptionally tight…
Oxochromium(V) complexes of 5,10,15-tris(pentafluorophenyl)corrole and brominated derivatives oxygenate substrates (triphenylphosphine and norbornene) with concomitant production of chromium(III). Regeneration of CrVO by reaction of dioxygen with CrIII completes an aerobic catalytic cycle, with very large solvent effe…
The first fluorescent styryl dye library with a broad color range was synthesized by combinatorial condensation of various aldehydes and methyl pyridinium compounds, and their applications as organelle specific staining probes were demonstrated.
Statistical properties of the critical current distribution in superconductor with fractal clusters of a normal phase are considered. It is found that there is the range of fractal dimensions in which the variance and expectation for this distribution increases infinitely. Simple technique of avoiding such a divergenc…
In our preceding serial works, we have investigated the generation of higher-order atomic dipole squeezing (HOADS) in a high-Q micromaser cavity, discussing the effects of dynamic Stark shift, atomic damping, atomic coherence and nonlinear one-photon processes and different initial states (for example, correlated and…
Two-mode quantized electromagnetic fields can be entangled and admit a large number of coherent states. In this paper, we consider a two-mode system that consists of a two-level atom interacting with a two-mode quantized electromagnetic field, which is initially prepared in an entangled two-mode coherent state, via a…
Monodisperse silver nanowires with high aspect ratio are prepared via electrochemical plating into monodomain porous alumina templates. The nanowires have a length of 30 μm or more, adjustable uniform diameters ranging between 180 and 400 nm, and a monodispersity of about 2%. The templates were fabricated by anodizati…
Complete regeneration of complex tissues and organs is usually precluded by fibrotic reactions that lead to scarring. Fish, salamanders, and larval anurans are among the few vertebrates capable of regenerating lost appendages, and this process seems to recapitulate ontogenic development of the structure in most respec…
Through an interplay between scanning tunneling microscopy (STM) and density functional theory (DFT) calculations, we show that bridging oxygen vacancies are the active nucleation sites for Au clusters on the rutile TiO2(110) surface. We find that a direct correlation exists between a decrease in density of vacancies…
Thermal fatigue tests were performed on tungsten-copper brazed specimens within the designed temperature range of design temperature of the Fusion Experimental Reactor (FER) divertor collector plates. Two types of brazing fill metals (nickel-based and titanium content silver-based metals) were selected for bonding the…
Abstract Switching to N 2 or CO 2 for foaming thermoplastics increases cooling requirements for a foam extrusion line. Factors affecting cooling heat transfer and proposed correlations are described. © 2003 Wiley Periodicals, Inc. Adv Polym Techn 22: 69–74, 2003; Published online in Wiley InterScience (www.interscienc…
Charge buildup in 30- mu m-thick films of polypropylene irradiated with monoenergetic electron beams of 10-45-keV energy is investigated. Using the split-Faraday cup, the mean charge depths at the beginning of electron injection, at the termination of injection, and 10 minutes after injection are measured. It is found…
Electrical conduction in the aromatic polyamides commercially known as Nomex or HT-1 film is studied over a temperature range of 50-200 degrees C and electric-field strengths up to 400 kV-cm/sup -1/ over a time range of 1-60 min. This material has excellent thermal and mechanical properties, making it suitable for hig…
The authors reevaluate the required test voltage, necessary stabilization time, and traditional measurement frequencies for corona probe testing. Studies indicate that the corona inception voltage (CIV) can be estimated for each stator slot. When a coil is operated below its CIV, deterioration due to electrical discha…
A Be-packed bed between the high-temperature breeder and low-temperature coolant has been proposed for an ITER solid breeder base blanket. The design offers the possibility of adjusting the solid breeder temperature through active control of the packed-bed effective conductivity; such control can potentially be achiev…
Four candidate materials were evaluated for use as high-temperature capacitor dielectrics. The materials investigated were polybenzimidazole polymer and three aramid papers. The samples were characterized with and without heat treatment in terms of their dielectric constant and loss. These properties of the heat-treat…
A light and high-torque servo motor using SMA (shape memory alloy) is presented. Its design method is derived using the dynamical properties of SMA and the geometrical relationships of the SMA motor. A fixed-ring-type SMA motor with a synchronous belt was designed, and its torque and maximum rotary speed were calculat…
One single-layer and two four-layer example winding structures are used to illustrate the impact of excitation frequency on the magnetic field intensity and current density distributions in transformer windings. By plotting the distributions as phasors in three-dimensional isometric plots, greater insight is gained in…
Inelastic x-ray scattering data of liquid Li, Na, and Al for dynamical structure factors have been analyzed by proposing a semiempirical model. The model is based on the extension of the hydrodynamic model to the viscoelastic region so that it satisfies the first four nonvanishing sum rules. It has been found that the…
A millimeter-size actuator to drive a rotary joint for a small robot was designed and fabricated using shape memory alloy (SMA), which has the merits of large force/weight and extendability to micron size. The actuator is of the push-pull type, composed of two SMA sheets of 0.05 mm*0.5 mm*3 mm. The theoretical model o…