Materials Literature
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The changes in composition of the grain boundary regions in Nimonic PE16, which occur during heat treatment and on neutron irradiation, are described. The results show that the composition of these regions is sensitive to heat treatment variables, bulk composition, and irradiation. In particular, molybdenum has a stro…
This article Introduces a technology for the simultaneous control of the emissions of PCDD/ PCDF, hydrochloric acid (HCI) and nitrogen oxides (NOx) from municipal solid waste (MSW) Incinerators. The technology uses ammonia as the control medium for all three pollutants. In this paper, the theoretical basis of the tech…
Abstract The strength distribution of reaction-bonded silicon carbide tubes that failed by internal pressurization was predicted from strength distributions obtained from simple laboratory test specimens at room temperature. The strength distributions of flexure bars, C-rings tested in tension, C-rings tested in compr…
Abstract Graft copolymerization was carried out onto a poly(methyl methacrylate) (PMMA) plate for surface modification. The following treatments were conducted to introduce peroxides into the PMMA surface prior to graft copolymerization: UV irradation, corona discharge, glow discharge, and ozone exposure. The static c…
In order to study the structure of defects in nematic liquid crystals, we have constructed a numerical procedure that minimizes the Landau-de Gennes free energy model. Using a new representation, a finite-element discretization, and a direct minimization scheme based on Newton's method and successive overrelaxation, t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of large but defective deltahedra in the structural chemistry of very complex solid borides and gallidesJeremy K. Burdett and Enric CanadellCite this: Inorg. Chem. 1991, 30, 9, 1991–1998Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Pu…
Reversible phase transformations with volume contractions were found at 18 GPa and 22 GPa when graphite was compressed at room temperature. Volume contraction was detected in a diamond anvil cell by observing a plateau in the curve of generated pressure versus the cell load. The phase realized at 18 GPa is thought to…
Reactive sputter deposition was used to grow a phase-separated 0.40 Au/0.56 Au2O3/0.04 Au-hydroxide cermet film and x-ray photoelectron spectroscopy was used to examine the Au 4f and O 1s core electron binding energy of each phase. The valence band structure of Au2O3 is reported here for the first time, and consists o…
Abstract 2‐Ethyl‐2‐hydroxymethyltrimethylene carbonate (5‐ethyl‐5‐hydroxymethyl‐1,3‐dioxan‐2‐one) ( 1 ) was treated with trimethylsilyl chloride, benzyl chloroformate and phenyl isocyanate to give the corresponding 5,5‐disubstituted 1,3‐dioxan‐2‐ones 2 , 3 and 4 . These monomers were subjected to anionic ring‐opening…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of a bridging dicarboxylate ligand on the synthesis and physical properties of (.mu.-oxo)bis(.mu.-carboxylato)diiron(III) complexesRobert H. Beer, William B. Tolman, Simon G. Bott, and Stephen J. LippardCite this: Inorg. Chem. 1991, 30, 9, 2082–2092Publication Date (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric relaxation studies of poly(4-hydroxybenzoic acid) and copolyesters based on 4-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acidDouglass S. Kalika and Do Y. YoonCite this: Macromolecules 1991, 24, 11, 3404–3412Publication Date (Print):May 1, 1991Publication Histor…
Calculations are reported of the dynamic second hyperpolarizabilities (\ensuremath{\gamma}) of ${\mathrm{H}}_{2}$ and ${\mathrm{D}}_{2}$ which are relevant to three different nonlinear optical processes. They have been carried out using an expanded basis set for the \ensuremath{\Delta} states that occur in the sum-ove…
Losses were measured as a function of magnetization frequency f/sub d/ for two advanced soft magnetic alloys: laser-scribed 0.23-mm HI-B steel ZDKH (designated HB) and consolidated amorphous Powercore (designated PC). Although domain observations on HB yielded distinct domain refinements due to the laser treatment, an…
Perovskite oxides , [ and , ] containing A site defects were studied by thermal analysis, measuring of the temperature dependence of electrical conductivity (373–1273 K) and x‐ray diffraction. The results showed that underwent a phase transition accompanied by oxygen desorption at about 1000 K in air. The electrical c…
The synthesis of new zirconium and hafnium bisporphyrinate double deckers M(P) 2 (MZr, Hf; POEP, TPP) 2,3) is described. The complexes are characterized by UV/Vis/NIR and 1 H‐NMR spectroscopy and cyclic voltammetry. As compared with MCe, the redox potentials or the energies of the nearinfrared absorption bands of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(carbosilane) precursors of silicon carbide: the effect of cross-linking on ceramic residueBruno Boury, Robert J. P. Corriu, and William E. DouglasCite this: Chem. Mater. 1991, 3, 3, 487–489Publication Date (Print):May 1, 1991Publication History Published online1 May 200…
Single crystals of the reduced niobate Ba2Nb15O32 are produced by heating NbO2 in BaO·3B2O3 under high-vacuum conditions. The borate acts both as a source of BaO and as a flux for crystallization. The compound Ba2Nb15O32 crystallizes in space group R3 (a = 7.777 (1) Å, c = 35.518 (6) Å) and contains isolated [Nb6O12]O…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSegregation of low molecular weight symmetric diblock copolymers at the interface of high molecular weight homopolymersPeter F. Green and Thomas P. RussellCite this: Macromolecules 1991, 24, 10, 2931–2935Publication Date (Print):May 1, 1991Publication History Published onlin…
Two distinct types of fumarase were purified to homogeneity from aerobically grown Escherichia coli W cells. The amino acid sequences of their NH2-terminals suggest that the two enzymes are the products of the fumA gene (FUMA) and fumC gene (FUMC), respectively. FUMA was separated from FUMC by chromatography on a Q-Se…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBenzoannelated centropolyquinanes. Part IX. Synthesis and conformational behavior of fenestrindans (tetrabenzo[5.5.5.5]fenestranes) with four bridgehead substituentsDietmar Kuck, Andreas Schuster, and Ralph A. KrauseCite this: J. Org. Chem. 1991, 56, 11, 3472–3475Publication…