Materials Literature
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Microstructural evolution of a 7.8 mol% Ca‐PSZ, fired at 1870°C and subsequently aged at 1300°C, was studied and correlated with the mechanical properties. The morphology, rafting, and subsequent coarsening of the tetragonal ( t ) ZrO 2 precipitates were of particular interest, as was the instability of some of the t…
It is shown that the degradation of XLPE, resulting from its exposure to partial discharges, leads to the formation of solid, liquid and gaseous products that result directly from the discharge synthesis reactions taking place within the intervening electrode gap space. The prime reagents in the discharge synthesis pr…
Abstract Trifunctional hydroxy‐terminated oligomeric polyesters, M n 500, 1000, and 2000, were prepared by initiating ring‐opening copolymerization of δ‐valerolactone and ε‐caprolactone with glycerol. The prepolymers were converted to crosslinked polyester‐urethanes by their reaction with hexane‐1,6‐diisocyanate in pr…
Abstract This article reveals the diverse nature of runaway systems as well as some general trends. In addition, it also serves to point out the usefulness of such an apparatus in characterizing virtually unknown systems.
Ultrafine ferrites, {MFe_2O_4} where M = Mg, Mn, Fe, Co, Ni, and Zn, were prepd. by the combustion/decompn. in a melt of solid soln. precursors, hydrazinium metal hydrazinecarboxylate hydrates, {N_2H_5M_1}/{3Fe_2}/{3(N_2H_3COO)}3.{H_2O} (M = Mg, Mn, Fe, Co, Ni, and Zn). The precursors decomp. at low temps. (75-200°) w…
Kerr electro-optic field mapping measurements are presented in electron beam irradiated polymethylmethacrylate (PMMA) where the accumulated trapped charge results in large self-electric fields of the order of 1 to 2.5 MV/ cm. The resulting numerous light maximum and minimum recorded on photographic film and videotape…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsotope and temperature dependence of transition-metal shielding in complexes of the type M(XY)6Cynthia J. Jameson, Dieter Rehder, and Martin HochCite this: J. Am. Chem. Soc. 1987, 109, 9, 2589–2594Publication Date (Print):April 1, 1987Publication History Published online1 M…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNuclear relaxation in the magnetic coupled system Cu2Co2SOD. Histidine-44 is detached upon anion bindingL. Banci, I. Bertini, C. Luchinat, and A. ScozzafavaCite this: J. Am. Chem. Soc. 1987, 109, 8, 2328–2334Publication Date (Print):April 1, 1987Publication History Published…
The authors present self-consistent band-structure calculations of HCP Be made by means of the full-potential linearised-augmented-plane-wave (LAPW) method and on the basis of the local density approximation. In contrast to earlier calculations no shape approximations for the charge density or the potential are made a…
Paramagnetic complexes of manganese(II), iron(III), and gadolinium(III) with many ligands appear to undergo ligand substitution in vivo, producing biodistribution data similar to the hydrated metal ions. To identify ligands likely to be valuable in the preparation of paramagnetic contrast agents, a series of aminopoly…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcid-mediated trans-cis isomerization of substituted tetrathiafulvalenes. Selective precipitation of the trans isomerAbdelaziz Souizi, Albert Robert, Patrick Batail, and Lahcene OuahabCite this: J. Org. Chem. 1987, 52, 8, 1610–1611Publication Date (Print):April 1, 1987Public…
Abstract Self aggregation of 4,4′,4″,4'″-(21H,23H-porphine-5,10,15,20-tetrayl)tetrakis[1-methylpyridinium] cation (TMPyP4+) in water has been verified by means of fluorescence and 1H NMR spectroscopy. The novel fluorescence behavior of TMPyP such as extraordinarily red-shifted Q(0-0) fluorescence band, blue shift of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational spectra of carboxylate complexes. VII. Partial valence trapping in a trinuclear mixed-valence iron(III,III,II) cluster: vibrational spectra of [Fe3O(OOCCH3)6L3] and related mixed-metal complexesL. Meesuk, U. A. Jayasooriya, and R. D. CannonCite this: J. Am. Chem.…
Cytochrome c oxidase contains four redox-active metal centers: two heme irons, cytochromes a and a3, and two copper ions, CuA and CuB. Due to the paucity of spectroscopic signatures for both copper sites in cytochrome c oxidase, the ligands and structures for these sites have remained ambiguous. The specific depletion…
In den letzten fünfzehn Jahren wuchs die Einsicht in die Notwendigkeit eines effizienten Umweltschutzes. Konkrete Maßnahmen setzen allerdings eine umfassende Analyse der gegebenen Umweltsituation und die Abschätzung sowohl der positiven Auswirkungen als auch der Risiken einer geplanten Veränderung voraus. Dies ist nur…
An electron spectrometer is described for use in threshold photoionisation studies. The spectrometer incorporates a penetrating field extractor stage, a 127 degrees cylindrical deflection analyser and an electrostatic lens system to match the two together. The high collection efficiency, resolution, transmission and s…
Unidirectional L-phenylalanine transport into six brain regions of pentobarbital-anesthetized rats was studied using the in situ brain perfusion technique. This technique allows both accurate measurements of cerebrovascular amino acid transport and complete control of perfusate amino acid composition. L-Phenylalanine…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, spectroscopic, and structural studies of extremely short chain basket handle porphyrins and their zinc(II) complexesUrsula Simonis, F. Ann Walker, Patricia Lani Lee, Bernard J. Hanquet, Dieter J. Meyerhoff, and W. Robert ScheidtCite this: J. Am. Chem. Soc. 1987, 1…
The map of the intermolecular overlap integrals(S) of the lowest unoccupied molecular orbital(LUMO) of Ni(dmit) 2 was calculated by varying the intermolecular configuration parameters in order to examine the dimensionality of the electronic band structure of the molecular conductors based on Ni(dmit) 2 . Despite the s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of tautomerism in 2-substituted 5,10,15,20-tetraphenylporphyrins: directionality of proton transfer between the inner nitrogensMaxwell J. Crossley, Leslie D. Field, Margaret M. Harding, and Sever SternhellCite this: J. Am. Chem. Soc. 1987, 109, 8, 2335–2341Publicati…