Materials Literature
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Recently, the clinical application of electronic portal imaging devices has enabled more frequent verification of patient setup for radiation treatment. However, the image quality has sometimes proven to be inadequate, motivating the investigation of alternative sensors with better image quality. Amorphous selenium (a…
The first sharp diffraction peak which signifies medium-range structural order in chalcogenide glasses has been studied based on some observations and the construction of ball-and-stick models. The crystalline model originally proposed by Vaipolin and Porai-Koshits provides straighforward explanations for most feature…
The reversible cleavage of indole-3-glycerol by the alpha-subunit of tryptophan synthase has been proposed to be catalyzed by alphaGlu49 and alphaAsp60. Although previous x-ray crystallographic structures of the tryptophan synthase alpha2beta2 complex showed an interaction between the carboxylate of alphaAsp60 and the…
Poly(oxyethylene)s containing n -octylthiomethyl side groups were synthesized by the reaction of poly[oxy(chloromethyl)ethylene] (CE) and sodium n -octanethiolate in DMAc. These were oxidized to poly(oxyethylene)s containing n -octylsulfonylmethyl side groups. When the mole percentage of sulfur containing monomeric un…
Various kinds of alkali-free Ga-substituted MCM-41 catalysts were synthesized. The BET surface area of all catalysts was over 700 m2/g, and the XRD patterns suggested the hexagonal structure. The hexagonal repeat distance was controlled by changing the carbon number of the surfactant. The acid-probe reaction, 2-methyl…
Nine solution‐phase electrochromic thin‐layer cells based on N,N' ‐di‐ n ‐heptylviologen perchlorate, , and N,N,N',N' ‐tetramethyl‐ p ‐phenylenediamine, TMPD (50 mM each in , no supporting electrolyte), were arranged in three rows and three columns, and were matrix‐addressed without crosstalk with six inputs. The abse…
A low concentration of rare earths $(R)$ plays an important role in magnetic materials because of their large anisotropy. However, the Curie temperature ${(T}_{C})$ has a decreasing trend with increasing Fe concentration in $R$-Fe compounds. In order to understand the variation of ${T}_{C}$ as a function of iron conce…
A thin film multilayer structure consisting of Pb(Zr0.53Ti0.47)O3(PZT) and PbTiO3(PT) were fabricated by a sol-gel process. The effects of the number of PZT/PT layers upon microstructure and dielectric characteristics were investigated. For a pure PZT thin layer annealed at 600 °C, the microstructure observed was a ro…
Abstract The feasibility of shaping a nucleated polymer/gas solution represents a significant advancement for microcellular plastics process technology. Through proper design of the foaming die, nucleated solution flows can be shaped to arbitary dimensions while maintaining the functional independence of cell nucleati…
Homogeneous and inhomogeneous spectral linewidths of the ${(}^{2}{F}_{5/2}{)}_{1}\ensuremath{-}{(}^{2}{F}_{7/2}{)}_{1}$ transition in ${\mathrm{Yb}}^{3+}$-doped fluorozirconate glasses are determined by fitting Voigt profiles to the inhomogeneously broadened emission and absorption spectra between 10 and 300 K. The ho…
The final phases of zirconia powders depend on the synthesis method employed, and the amounts of stabilizer present. In this study, ceria‐ and yttria‐doped zirconia powders were prepared by urea hydrolysis and subsequent hydrothermal treatment. The amount of tetragonal ( t ) vs monoclinic ( m ) phase in the powders in…
A homology-based modeling study on the extremely halophilic glutamate dehydrogenase from Halobacterium salinarum has been used to provide insights into the molecular basis of salt tolerance. The modeling reveals two significant differences in the characteristics of the surface of the halophilic enzyme that may contrib…
Persistent spectral hole burning has been observed at 77 K, 180 K, and room temperature for Eu(3+) in sodium aluminosilicate glass melted under a reducing atmosphere. In particular, room-temperature persistent spectral hole burning is reported for the first time to our knowledge in Eu(3+) -doped materials. The persist…
Microfabrication by coextrusion is a novel ceramic processing technique capable of creating complex ceramic‐metal structures. These structures are fabricated by multiple pass coextrusion of a feedrod comprised of several powder‐filled thermoplastic compounds. The compounds contain either ceramic, metal, or fugitive po…
A new method was developed for binding poly-(ethylene oxide) (PEO) to polymer surfaces that involves the use of electron beam irradiation in two steps. In the first, methacrylic acid was grafted and polymerized to a polymer surface, changing it from hydrophobic to hydrophilic. Exposure of this surface to aqueous PEO s…
The metallic state of conducting polymers is a subject of continued interest and controversy. By means of a series of high-precision reflectance measurements on PF6-doped polypyrrole (PPy-PF6), the processes occurring as the system passes through the metal–insulator (M–I) transition are clarified. Evidence is presente…
We show via calculation and experiment that a recently observed angular magnetoresistance effect in low-dimensional conductors can be explained by ``effective electrons,'' which dominate the conductivity for magnetic-field orientations near inflection points on a warped Fermi surface. Closed orbits, which form in cert…
Novel poly(oxyethylene)/poly(caprolactone) POE/PCL copolymers were synthesized by step growth polymerization of poly(ε-caprolactone) diols and poly(ethylene glycol) diacids using dicyclohexylcarbodiimide as coupling agent. The reaction was performed at room temperature and yielded multiblock copolymers with predetermi…
Two samples with the same nominal composition ${\mathrm{La}}_{0.83}{\mathrm{Sr}}_{0.17}{\mathrm{Mn}}_{0.98}^{57}{\mathrm{Fe}}_{0.02}{\mathrm{O}}_{3}$ were prepared in air and argon. Thermograviametric, structural, resistive, and magnetic measurements show that the air-made sample has slightly higher ${\mathrm{Mn}}^{4+…
We explore a simple model for supercooled liquids in which reorientational and translational motions are inherently coupled to the structural relaxation. Several controversial aspects of the molecular motion in glass-forming materials are naturally resolved within the framework of our model. These include the geometry…