Materials Literature
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Environmental cracking of ductile nickel-base alloys has occurred both in pressurized water reactors (e.g., steam-generator tubing) and boiling water reactor components such as pressure-vessel safe ends, weld butters, and filler metals for joining nickel-base alloys or dissimilar metals, and attachment welding pads on…
Abstract The synthesis and characterization are reported of two new series of structurally isomeric polyacrylates containing the azobenzene moiety spaced away from the backbone by a hexamethylene spacer and substituted in 4‐position with linear alkoxy groups (C 1 C 6 , C 10 ) and with a lateral methyl group in 2′‐ or…
The fracture toughness of chemically vapor‐deposited diamond is estimated by a Vickers indentation method. Freestanding diamond films of 400‐μm thickness are produced with plasma‐enhanced chemical vapor deposition and highly polished for indentation testing. Indentation testing was performed with a microhardness teste…
Abstract The effect of pretreatment with sulfuric acid on several metal oxide catalysts for the title reaction was investigated. TiO2, ZrO2, and Fe2O3 Pretreated with sulfuric acid showed high activity, whereas the activity of Al2O3 was decreased by the treatment.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel thermoplastic elastomer triblocks of a soft polyisobutylene midblock connected to two hard PMMA stereocomplex outer blocksJoseph P. Kennedy, Jack L. Price, and Katsuo KoshimuraCite this: Macromolecules 1991, 24, 25, 6567–6571Publication Date (Print):December 1, 1991Pub…
Rigid-rod polyesters with long alkyl side chains, denoted as H-Cn, have been prepared by reacting 1,4-dialkylesters of pyromellitic acid with hydroquinone. The alkyl groups were varied from hexyl (n=6) to octadecyl (n=18). The mesomorphic properties and structure of these polyesters were examined by optical microscopy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn approach to organic ferromagnets. Synthesis and characterization of 1-phenyl-1,3-butadiyne polymers having a persistent nitroxide group on the phenyl ringKatsuya Inoue, Noboru Koga, and Hiizu IwamuraCite this: J. Am. Chem. Soc. 1991, 113, 26, 9803–9810Publication Date (Pr…
A new serpin (serine proteinase inhibitor), having antichymotryptic activity, was isolated from silkworm, Bombyx mori, larval hemolymph and was named silkworm antichymotrypsin II (sw-AchyII). Amino-acid-sequence analysis of sw-AchyII revealed that it consisted of 375 amino acids without cysteine or glycosylated residu…
The electrical resistivity of the D${0}_{3}$-type (${\mathrm{Fe}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{V}}_{\mathit{x}}$${)}_{3}$Ga and (${\mathrm{Fe}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ti}}_{\mathit{x}}$${)}_{3}$Ga alloys has been measured over the temperature range from 4.2 to 1250 K. The temp…
We have purified the enzyme 5,10-methylenetetrahydrofolate dehydrogenase (EC 1.5.1.5) from Escherichia coli to homogeneity by a newly devised procedure. The enzyme has been purified at least 2,000-fold in a 31% yield. The specific activity of the enzyme obtained is 7.4 times greater than any previous preparation from…
Irradiation of Cr(CO) 3 (η 6 ‐1,3,5‐cycloheptatriene) ( 1 ) in the presence of bis(trimethylsilyl)ethyne results in [6 + 2] cycloaddition of the alkyne to the cycloheptatriene ligand, yielding Cr(CO) 3 (η 4:2 ‐7,8‐bis(trimethylsilyl)bicyclo[4.2.1]nona‐2,4,7‐triene} ( 2 , 60% yield, Φ=0.08), which upon oxidative decomp…
The effect of plastic strain on the deformation microstructure has been investigated in polycrystalline copper rolled at room temperature to 5, 10, 20, and 30% reduction in thickness (equivalent strain 0·06–0·42). Results from transmission electron microscopy (TEM) observations show that dense dislocation walls (DDWs)…
Abstract A new route for the synthesis of bioadhesive water soluble polymeric drug carriers has been developed. Novel monomers, namely, N ‐methacryloylglycylglycylgalactosamine (MA‐Gly‐Gly‐GalN) [ 8 ], MA ‐Gly‐Gly‐FucN [ 9 ], MA ‐Gly‐Gly‐GlcN [ 10 ], and MA‐Gly‐Gly‐ManN [ 11 ], and copolymers [ 12–16 ] based on N ‐(2‐…
Engineers are increasingly applying polymers in structures that have to withstand impact. However, compared to metals, relatively few studies of their mechanical properties at high rates of deformation have been carried out. Ibis paper describes an investigation of the high strain-rate behaviour in compression of a nu…
The symmetry adapted cluster (SAC) and SAC-configuration interaction (SAC-CI) theories are applied to the calculations of the ground and excited states of MnO−4. With the use of three different active spaces, we examine the convergence of the results. Electron correlations work to relax charge polarizations of the Mn–…
A solution sol‐gel method has been developed to prepare 0.9Pb(Mg 1/3 Nb 2/3 )O 3 ‐0.1PbTiO 3 (0.9PMN‐0.1PT) ceramics. During the processing the gel first converted to cubic pyrochlore phase at a calcination temperature of 600°C followed by the formation of pure perovskite phase at 775°C. The ceramics sintered at 1250°…
A new kind of discotic liquid crystal has been investigated where one out of the six ether side chains of a triphenylene core was replaced by an ester side chain. We have found greatly increased clearing temperatures and suppressed crystallization thus leading to glass forming discotics. Here we report the synthesis,…
The detailed emission and excitation spectra and the temperature dependence of the excitation efficiency are obtained for MgS:Cu + , CaS:Cu + , SrS:Cu + and BaS:Cu + at various temperatures between 16 and 293 K. In the excitation spectra of all the powder phosphors, two bands assigned to the intraionic transitions in…
The temperature dependence of the order parameters in quartz, NaNO3, Mo8O23 show saturation behaviour with characteristic saturation temperatures θ. The quantitative behaviour is in good agreement with the predictions of Salje, Wruck and Thomas (1991) for both displacive (eg. quartz) and order/disorder systems (eg. Na…
The interaction of atomic and molecular hydrogen with the (0001) surface of magnesium has been studied using EELS, TDS, work-function measurements, and core-level spectroscopy. No evidence for molecular or dissociative adsorption of H2 is observed at the substrate temperature investigated (>110 K, atomic hydrogen is b…