Materials Literature
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Crystalline silicon carbide (SiC) fiber was produced by a new, simple procedure. Activated carbon fiber (ACF) was reacted with gaseous silicon monoxide and was converted to SiC fiber at elevated temperature and reduced pressure. The reaction was completed at temperatures as low as 1473 K. The reacted fiber consisted o…
Leucine dehydrogenase has been purified to homogeneity from a moderate thermophilic actinomycete, Thermoactinomyces intermedius IFO 14230. The enzyme can be stored without loss of its activity at a low temperature (e.g., 4 degrees C) for over two years. The enzyme was more thermostable at higher concentrations of salt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLarge photorefractivity in an exceptionally thermostable multifunctional polyimideZhonghua Peng, Zhenan Bao, and Luping YuCite this: J. Am. Chem. Soc. 1994, 116, 13, 6003–6004Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue…
Abstract Treatment with 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ) oxidized 2,6‐diethyl‐1,3,5,7,8‐pentamethylpyrromethene–BF 2 complex 1 , 13,14‐trimethyl‐2, 3, 4, 5,9,10,11,12‐octahydroindomethene–BF 2 complex 5 , and 1,3,5,7,8‐pentamethyl‐1,2,3,5,6,7‐hexahydropyromethene–BF 2 complex 8 to the weakly fluorescent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolylactones. 28. Syndiotactic Poly(.beta.-D,L-hydroxybutyrate) by Ring-Opening Polymerization of .beta.-D,L-Butyrolactone with Butyltin MethoxidesHans R. Kricheldorf, Soo-Ran Lee, and Nico ScharnaglCite this: Macromolecules 1994, 27, 12, 3139–3146Publication Date (Print):Ju…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubvalent Ternary Silver Oxides: Synthesis, Structural Characterization, and Physical Properties of Pentasilver Orthosilicate, Ag5SiO4Christoph Linke and Martin JansenCite this: Inorg. Chem. 1994, 33, 12, 2614–2616Publication Date (Print):June 1, 1994Publication History Publ…
The mechanisms contributing to densification during non‐isothermal heat treatments in sol‐gel titania films have been studied. At low temperatures, shrinkage is attributed to condensation reactions between hydroxyls located primarily within the oxide skeleton. At higher temperatures, densification is due to both conti…
This paper deals with the stresses generated during high temperature oxidation and their relationship to scale fracture. In the first part, the objective is to differentiate growth stresses from thermal stresses and give evidence for relaxation phenomena. The results obtained for materials which develop NiO, Cr2O3 or…
Summary Changes in soil and biogeochemical processes following the replacement, 60 years ago, of part of a deciduous forest by a coniferous stand were evaluated by (i) a balance‐sheet approach using soil and biomass element content analyses and the mineral flux, and (ii) the inclusion of test‐mineral and resin bags in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectroless Plating of Organic Thin Films by Reduction of Nonionic Surfactants Containing an Azobenzene GroupTetsuo Saji, K. Ebata, Kazuhiro Sugawara, Shunlin Liu, and Ken KobayashiCite this: J. Am. Chem. Soc. 1994, 116, 13, 6053–6054Publication Date (Print):June 1, 1994Publ…
The crystalline structure of the heavy alkaline earth chalcogenide SrSe was studied at high pressure by x-ray diffraction using a synchrotron source. The NaCl-type (B1) structure of SrSe was found to be stable on loading to 14.2 GPa where the CsCl-type (B2) structure was evidenced with a 10.7% decrease in relative ato…
We have measured partially angle-integrated photoemission with linearly polarized undulator radiation on the valence band and on the 3p and 3s core levels of iron in an Fe(100) single crystal. A large asymmetry is measured for 3p core levels when reversing the magnetization direction perpendicular to the photoemission…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMobile Metal-Metal Bonds: Studies on Mixed Valence Ir3 and Ir4 ClustersAnne Venturelli and Thomas B. RauchfussCite this: J. Am. Chem. Soc. 1994, 116, 11, 4824–4831Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994…
Abstract Physical and chemical structure, as well as thermal behavior of solution‐cast regenerated films, prepared from tussah ( Antheraea pernyi ) silk fibroin, were compared with those of solution‐cast native films, in order to ascertain whether treatment (degumming, dissolution) used for preparation affected their…
Niendorf HP, Alhassan A, Geens VR, Claufß W. Safety Review of gadopentetate dimeglumine: extended clinical experience after more than five million applications. Invest Radiol 1994;29:S179–S182.
Abstract The pillaring process of montmorillonite and beidellite with Al and Ga polymers has been studied using XRD, IR, 27 Al, 71 Ga, and 29 Si MAS NMR, TGA, TEM, N 2 adsorption and chemical analyses. The Al adsorption maximum for montmorillonite is close to 5.5 mEq Al/g clay, whereas the maximum for Ga is higher. Ba…
Deformation behaviour of a DO19, compound with an off-stoichiometric composition of Ti-36·5 at.% Al has been studied as a function of orientation at temperatures from −196°C to room temperature in compression. The critical resolved shear stress (CRSS) for {1100} 〈11 20〉 prism slip and (0001)〈1120〉 basal slip increases…
Hydrogen insertion in the ${\mathrm{Ce}}_{2}$${\mathrm{Fe}}_{17}$${\mathrm{H}}_{\mathit{x}}$ system leads to spectacular changes of the physical properties. A relative increase of the Curie temperature of almost 100% is observed as well as the highest volume increase. In addition to previous neutron diffraction measur…
With optical tweezers plus fluorescent labels it is now possible to force, and to observe, the stretching and the relaxation of a single polymer chain. We calculate here the unwinding of a tethered, flexible, chain ( N monomers) immersed in a solvent if, at time t = 0 starting from rest, one imposes either a flow ( V…
Several utilities have found partial discharge testing to be very useful for identifying motors or generators with deteriorated stator winding insulation. Such partial discharge tests are sensitive to problems associated with overheated insulation, loose stator bars, and pollution, all of which can cause in-service fa…