Materials Literature
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In PWRs, the Zr-1Nb-O alloy shows a marked enhancement in corrosion resistance in comparison with Zircaloy-4. The aim of this work is to analyze the reasons for these different behaviors and to determine the respective nature of the oxide growth controlling mechanisms under irradiation. Samples taken from Zircaloy-4 i…
Ordered macroporous silica and titania have been prepared using poly[styrene-co-(2-hydroxyethyl methacrylate)] (PS-HEMA) latex arrays as templates. Polystyrene (PS) particles have also been used to template macroporous titania. Arrays of spherical latex particles, with average diameters of 260 nm (PS-HEMA) and 390 nm…
When semiconductor developers noticed in the 1950s that electropolishing of bulk silicon left certain areas rougher than the rest and somewhat porous, they regarded these simply as imperfect areas. It was not until Leigh Canham, a scientist with DERA (the UK’s Defence Evaluation and Research Agency), discovered in 199…
Nanocrystalline ferrite formation by ball milling in Fe–0.89C steels with initial pearlite and spheroidite microstructures and their annealing behaviors have been studied through microstructural observation and microhardness measurement. It was found that nanocrystalline ferrite first forms near the surface of powders…
Time-resolved luminescence spectra of ZnO epitaxial thin films were measured by the optical Kerr gate method in femtosecond time regime under resonant excitation of the excitonic state. We observed the relaxation of hot carriers until the buildup of luminescence due to an electron–hole plasma (EHP) state and recovery…
A thermodynamic description of the Bi–In–Sb ternary system of lead-free solder alloys using the CALPHAD (Calculation of Phase Diagram) method is presented. Phase equilibria information such as vertical sections, liquidus projection and thermochemical quantities were calculated and compared with the experimental data.…
An automatic method has been developed with digital image analysis. The method uses background from the fuzz and pills on the textile with an automatically generated Fourier mask. An evaluation feature is calculated from values enclosed in the power spectrum by the Fourier mask. The image analysis evaluation results a…
(CoFeB)-(Si01.9) and CoFeB films were fabricated by synchronous triple RF magnetron sputtering with rotating a cylindrical electrode. Three types films for RF application in the range over 1 GHz were obtained, and these permeability characteristics and micro-structures were investigated.The as-deposited films exhibite…
The biocompatibility and degradation characteristics of cross-linked high amylose starch (Contramid were investigated in rats over 4 months. Contramid pellets (3-mm diameter and thickness) obtained by direct compression, were implanted subcutaneously and intramuscularly. On sequential time points, macroscopic observat…
The nonlinear shear rheology of a hyperbranched polyisobutylene (PIB) with narrow molecular weight distribution (Mw/Mn=1.3) was compared to that of a polydisperse (Mw/Mn=2.5) linear PIB. After adjusting the respective measurement temperatures to yield equal shear viscosities, the rheology was found to be quite similar…
Polyamide (nylon 6) fabrics have been treated with tetrafluoromethane low temperature plasma and then dyed with commercially available acid and disperse dyes. The morphology of the treated surfaces has been examined by scanning electron microscopy and chemical surface changes characterised by X‐ray photoelectron spect…
This paper discusses the theory, modeling, design, fabrication and preliminary test results of the MEMS loop heat pipe being developed at the Center for Microelectronic Sensors and MEMS at the University of Cincinnati. The emphasis is placed upon the silicon micro wick and its production through a novel technique know…
Abstract Crystal structures of 1,2-bis(2,4-dimethyl-3-thienyl)perfluorocyclopentene 1a, 1,2-bis(2,4,5-trimethyl-3-thieny)per-fluorocyclopentene 2a and their mixture were determined by X-ray crystal structure analysis and their photochromic reactivities were compared. In the crystal of 1a, 17 mol% of molecules adopted…
The synthesis and magnetic properties of two new hexanuclear iron complexes [Fe6O2(OH)2(O2CR)10L2] (R = But (3), Me (4); LH = 2-(2-hydroxyethyl)pyridine (hepH) (3), 6-methyl-2-(hydroxymethyl)pyridine (Me-hmpH) (4)) are reported. Both compounds are prepared by treatment of [Fe3O(O2CR)6(H2O)3]+ with three equivalents of…
A simplified theoretical model has been proposed to predict optical parameters such as thickness, thickness irregularity, refractive index, and extinction coefficient from transmission spectra. The proposed formula has been solved for thickness and thickness irregularity in the transparent region, and then the refract…
Abstract. Shape memory alloys (SMAs) constitute a unique class of materials that undergo a reversible phase transformation allowing the material to display dramatic stress-induced and temperature-induced deformations which are recoverable. Nickel Titanium (NiTi) SMA has be synthesized with refined grain size by a mech…
AlCu solid-solution alloys were dealloyed by immersion in alkaline solution to produce a high surface density of copper nanoparticles, simulating the region around a cathodic intermetallic phase in an industrial AlCuMg alloy. The cathodic behavior of the copper-enriched surface in neutral chloride or sulfate solutions…
Certain isotropic and anisotropic media with negative permittivity and/or permeability parameters have been recently labeled as BW-media due to their capability of supporting backward waves. Various suggestions for constructing composite materials realizing such media (also called metamaterials) have also been recentl…
This paper describes model-based, active control of an aftertreatment system for a spark ignition engine equipped with a three-way catalyst (TWC) and pre- and post-TWC oxygen sensors. A controller is designed to manage the oxygen storage level in the TWC in order to maximize the simultaneous conversion efficiencies of…
Gd(III) complexes are under intense scrutiny as contrast agents for magnetic resonance imaging (MRI). They act by enhancing tissutal proton relaxation rates. Much has already been done in order to get an in-depth understanding of the relationships between structure, dynamics, and contrastographic ability of these para…