Materials Literature
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The ZrC‐coated UO 2 particle is a promising fuel for high‐temperature gas‐cooled reactors. Particle fuels with multiple layers of pyrolytic carbon and ZrC have been irratiation‐tested to a maximum fast‐neutron fluence exceeding 2 × 10 25 /m 2 ( E < 29 fJ). In‐reactor fission‐gas release measured at a burnup of 1.5…
The water vapor (WV) permeance of lipid and lipid‐hydrocolloid films exposed to relative humidity (RH) gradients of 100–0%, 100–50%, 100–65% and 100–80% RH were determined. The lipids used were beeswax (BW) or a blend of BW and acetylated monoglycerides (AG). Hydrocolloids used were methylcellulose, carboxymethylcellu…
An alternative procedure is developed to the smoothed linear fitting method of McDonald and Owen. The procedure is based on the detection of discontinuities by comparing, at any given position, three smooth fits. Diagnostics are used to detect discontinuities in the regression function itself (edge detection) or in it…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariable modes of nickel(II) coordination with macrocyclic ligands based on 1,5-bis(2-mercaptoethyl)-1,5-diazacyclooctane (BME-DACO)Marcetta Y. Darensbourg, Ivan Font, Daniel K. Mills, Magdalena Pala, and Joseph H. ReibenspiesCite this: Inorg. Chem. 1992, 31, 24, 4965–4971Pu…
Direct write e-beam lithography and reactive ion etching was used to fabricate square-wave gratings in quartz substrates which serve as pure phase masks in the near-field holographic printing of gratings. This method of fabricating these masks extends the flexibility of the printing technique by allowing both abrupt p…
Abstract In the presence of a catalytic amount of bis(dipivaloylmethanato)manganese(II) (= Mn(dpm)2), various cholesterol derivatives are smoothly converted into the corresponding β-epoxides in good to high yields with combined use of molecular oxygen and isobutyraldehyde. These stereoselectivities are the reversal of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImproved synthesis of alumina-pillared montmorillonite by surfactant modificationLaurent J. Michot and Thomas J. PinnavaiaCite this: Chem. Mater. 1992, 4, 6, 1433–1437Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 N…
Cu2+ and VO2+ are the paramagnetic centers of the ferroelectric complexes ML2 that both display a S mesophase. The spontaneous polarization of these first paramagnetic ferroelectric liquid crystals is 23 and 20 nCcm−2, respectively.
It is commonly observed that displacive phase transitions, including ferroelectric phase transitions, can be accurately described by mean-field theory and hence Landau theory. In same cases the reasons why can be deduced by renormalisation group theory, but there are many other cases where the reasons are less clear.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemistry of poly(pyrrole chloride) films: a study of polymerization efficiency, ion transport during redox and doping level assay by electrochemical quartz crystal microgravimetry, pH and ion-selective electrode measurementsC. S. C. Bose, S. Basak, and K. RajeshwarCi…
An elektronische Schaltkreise erinnert das Bild rechts eher als an eine chemische Formel. Es symbolisiert jedoch einen Ru 22 ‐Komplex, wobei die Kreise für Metallzentren, die Sägezahnkurven für verbrückende und die Striche für terminale Liganden stehen. Der Ru 22 ‐komplex, der zur Klasse der Kaskadenverbindungen (Arbo…
A theory based on the concepts of quasi-punctual defects and hierarchically constrained molecular dynamics is extended to account for the effects of large stresses on the rate of elementary molecular motions. The extended theory provides a physical interpretation for the general features of the experimentally observed…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric relaxations of poly(fluoroalkyl methacrylates) and poly(fluoroalkyl .alpha.-fluoroacrylates)Shun Koizumi, Kenji Tadano, Yuji Tanaka, Tetsuo Shimidzu, Shoichi Kutsumizu, and Shinichi YanoCite this: Macromolecules 1992, 25, 24, 6563–6567Publication Date (Print):Nove…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanistic studies of group transfer polymerization. Silyl group exchange studiesRoderic P. Quirk and Jie RenCite this: Macromolecules 1992, 25, 24, 6612–6620Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November…
The tensile properties of three carbon matrix composites reinforced with SiC (Nicalon) fibers (materials A, B, C) have been measured with and without notches. One of the three materials (material B) had a relatively low strength and exhibited notch brittleness. This material had both a high interface sliding stress an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, reactivity, and dynamic behavior of a boron-containing silsesquioxaneFrank J. Feher, Theodore A. Budzichowski, and Joseph W. ZillerCite this: Inorg. Chem. 1992, 31, 24, 5100–5105Publication Date (Print):November 1, 1992Publication History Published online1 May 200…
Electron-beam induced deposition (EBID) of tungsten from the precursor gas W(CO)6 was investigated with the aim of enhancing the growth rate of the process. By varying dwell and loop time over a limited range, experimental deposition rates were compared to a time dependent model developed to describe the focused ion b…
From the systematic replacements of amino acid residues of Escherichia coli ribonuclease HI with those of its thermophilic counterpart, the basic protrusion domain including region 6 (R6) from residues 91 to 95 was found to increase the structural stability of the mutant protein (Kimura, S., Nakamura, H., Hashimoto, T…
Barnacle adhesion measurements provide an excellent method of assessing the foul release characteristics of non‐toxic surfaces. This paper describes both tensile and shear force methods that have been developed for field applications. Selected data are presented and the results discussed with respect to the variables…
Cobalt was incorporated by direct synthesis into three distinct kinds of microcrystalline microporous aluminophosphates (ALPOs): the large-pore ALPO-5 (free diameter ca. 7 angstrom), medium-pore ALPO-11 (free diameter ca. 6 angstrom), and small-pore ALPO-21 (free diameter < 4 angstrom) molecular sieves. All three p…