Materials Literature
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X‐ray photoelectron spectroscopy (XPS) has been used to study surface segregation in 9.5 mol% single‐crystal Y 2 O 3 ‐ZrO 2 which has been subjected to air anneals at temperatures ranging from 900° to 1500°C. The kinetics of segregation reveal an enrichment of Y, Si, Na, and Fe at short times; however, at longer times…
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<div class="htmlview paragraph">Vacuum insulation and phase-change thermal storage have been used to enhance the heat retention of a prototype catalytic converter. Storing heat in the converter between trips allows exhaust gases to be converted more quickly, significantly reducing cold-start emissions. Using a s…
Mitochondrial 2-enoyl-CoA hydratase (mECH) and 3,2-trans-enoyl-CoA isomerase (mECI), two enzymes which catalyze totally different reactions in fatty acid beta-oxidation, belong to the low-similarity hydratase/isomerase enzyme superfamily. Their substrates and reaction mechanisms are similar [Müller-Newen, G. & Stoffel…
This article reviews aspects of the electronic, chemical, and structural properties of metal/oxide and oxide/oxide interfaces which are formed via ultrathin film growth on oxide single-crystal surfaces. The interactions at the interfaces are classified based on the nature of the reaction products, thermodynamic predic…
The influence of ethylene oxide gas treatment on the in vitro degradation behavior of noncrosslinked, glutaraldehyde crosslinked or hexamethylene diisocyanate crosslinked dermal sheep collagen (DSC) using bacterial collagenase is described. The results obtained were compared with the degradation behavior of either non…
The multifragment emission for central collisions of $^{40}\mathrm{Ar}$ (25--150 MeV/nucleon) on $^{27}\mathrm{Al}$ was studied via the quantum molecular dynamics model. The distribution of intermediate mass fragments (IMFs) can be described by a power-law function with the parameter \ensuremath{\tau} or an exponentia…
The second-electron affinity of the oxygen atom is often required in modelling the behaviour of ceramics. It is usually taken to be about 8 eV, independent of the structure of the oxide being modelled. We show that this is not so. Quantum-mechanical calculations show that the true second-electron affinity of an in-cry…
Abstract New phosphorylated epoxy‐imide polymer was obtained using diimide‐diepoxide (DIDE) cured with bis(3‐aminophenyl)methylphosphine oxide (BAMP). In addition, composition of the synthesized diimide‐diepoxide (DIDE) with common curing agents, e.g., 4,4′‐diaminodiphenylether (DDE) and 4,4′‐diaminodiphenylsulfone (D…
Metallocene/aluminoxane catalysts are among the most important recent discoveries in the field of catalytic polymerization of olefins. Not only their high activities, but also the fact that they permit the synthesis of polymers with superior blends of properties are remarkable both from academic and industrial points…
RATIONALE AND OBJECTIVES: Gd-DTPA is a well-characterized, safe contrast agent frequently used in magnetic resonance imaging (MRI) of the central nervous system. The purpose of this double-blind, comparative MRI study of brain, spine, trunk, and limbs was to evaluate the safety and efficacy of Gd-DOTA versus Gd-DTPA i…
We have observed strong photoluminescence (PL) from a well-defined two-dimensional (2D) Si structure formed on a SIMOX (separation by implanted oxygen) wafer, where the thin ( <5 nm) single crystalline silicon film is sandwiched between SiO 2 layers. The PL intensity has a sharp maximum at a Si thickness of about 2…
Quality factors and fluence-to-ambient and fluence-to-personal-dose equivalent conversion factors for neutrons have been recalculated for neutrons with energies ranging from thermal to 20 MeV. The new calculations are based on the recommendations given in ICRU Publication 60 for the quality factor and on stopping powe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrisubstituted Heteropolytungstates as Soluble Metal-Oxide Analogs. Isolation and Characterization of [(C5Me5)Rh.cntdot.P2W15Nb3O62]7- and [(C6H6)Ru.cntdot.P2W15Nb3O62]7-, Including the First Crystal Structure of a Dawson-Type Polyoxoanion-Supported Organometallic ComplexMat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Diversity in Solvated Lanthanide Halide ComplexesWilliam J. Evans, Julie L. Shreeve, Joseph W. Ziller, and Robert J. DoedensCite this: Inorg. Chem. 1995, 34, 3, 576–585Publication Date (Print):February 1, 1995Publication History Published online1 May 2002Published…
<div class="htmlview paragraph">In the Dual Equal variable camshaft timing strategy, the intake and exhaust events are equally phase-shifted relative to the crankshaft as a function of engine operating conditions. The primary emphasis is on improved fuel economy and emissions at part load. The external EGR syste…
A differential scanning calorimeter with a temperature range of 77 to 873 K has been developed for use in combination with either time-resolved X-ray scattering or high-resolution energy-dispersive powder diffraction studies using synchrotron radiation. The first results of successful experiments are briefly described.
The synthesis of chiral liquid crystalline diacrylates is described. By mixing one of them with non-chiral liquid crystalline diacrylates. cholesteric phases are obtained of which the wavelength of reflection can be chosen by the composition of the mixture. After isothermal photopolymerization of the mixture a crossli…
D/H exchange between methane and a zeolite is the simplest reaction between a zeolitic proton and a hydrocarbon. Because of its simplicity, it offers a unique opportunity to test out possibilities that are offered by present-day computational techniques to obtain theoretical insight into the catalytic action of zeolit…
A computer experiment on foam rheology is performed with a simplified model in which the viscous dissipation in the liquid phase is taken into account. The simulation is carried out under the sheared boundary condition with a small shear rate. It is observed that violent flow like that of an avalanche occurs intermitt…