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(A,E,B)-invariant and (E,A,B)-invariant subspaces for the two-dimensional singular Roesser model are investigated. These subspaces are related to the existence of the solutions when the boundary conditions are in these subspaces. Also, the existence of a solution sequence in certain subspaces derived from the invarian…
The presence of TiC or TiN paritcles in an Al 2 O 3 matrix affects the thermal stability of the composites in oxidizing environments. In isothermic oxidation tests at 700°, 800°, 900°, 1000°, and 1100°C for up to 20 h, two different oxidation regimes have been observed at T < 900°C and at 900°C ≤ T ≤ 1100°C. At low…
An eight-coordinate manganese(II) ion is found in dication 1, the first complex between the [2.2.2]cryptand and a transition metal. The O- and N-donor centers take up positions at the corners of an almost perfect cube. The formation of this extremely rare coordination polyhedron for MnII can be attributed to the high…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTParticle beam-induced reactions versus thermal degradation in PMDA-ODA polyimideGiovanni Marletta, Fabio Iacona, and Andras TothCite this: Macromolecules 1992, 25, 12, 3190–3198Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published iniss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin crossover, dimerization, and structural dynamics of manganocenes probed by deuterium NHR spectroscopyFrank H. Koehler and Bjoern SchlesingerCite this: Inorg. Chem. 1992, 31, 13, 2853–2859Publication Date (Print):June 1, 1992Publication History Published online1 May 2002…
Abstract Novel 1,3,4‐oxadiazole‐containing polyazomethines were synthesized by the polycondensation of diamines, 2,5‐bis ( m ‐aminophenyl)‐1,3,4‐oxadiazole (BMAO) and 2,5‐bis ( p ‐aminophenyl)‐1,3,4‐oxadiazole (BPAO), with aromatic dialdehydes, isophthalaldehyde and terephthalaldehyde, in m ‐cresol at 20°C. These poly…
Abstract X-ray diffraction studies of the pore-lining chloritic mineral from the Tuscaloosa Formation disclose a marked pattern of odd-order line broadening for the 001 to the 00,16 reflections. The odd-order peaks are approximately twice as broad as the even orders after correction for instrumental broadening effects…
Abstract It is shown that the nth center of a radical ring coincides with that of its adjoint group, from which a result of Jennings is sharpened and a conjecture of his is confirmed.
Abstract We investigate the validity of methods for background correction in XPS by comparing determined peak intensity ratios with theory. For Ag, Pt and Au, peaks are considered for which possible errors in the inelastic electron mean free path and in the energy dependence of the analyser response function have mini…
Abstract Rhaetian (Upper Triassic) sandy horizons were sampled from the Paris Basin from SW to NE, crosscutting the Rhaetian at different depths from outcrop in the NE to 2700 m in the centre of the basin. The smallest day sub-fractions (<0·2 μ m) from the deepest samples consist mainly of illite and chlorite havin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, crystal structure, magnetic susceptibility, and single-crystal EPR studies of bis(diazafluorenone)dichlorocopper(II): a novel Cu(NN)2X2 system with an unusual distortionC. Balagopalakrishna, M. V. Rajasekharan, S. Bott, J. L. Atwood, and B. L. RamakrishnaCite this…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon filament growth on platinum catalystsW. T. Owens, N. M. Rodriguez, and R. T. K. BakerCite this: J. Phys. Chem. 1992, 96, 12, 5048–5053Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https://pubs.acs.org/d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectra and structure of acetylene on sodium chloride (100)S. Keith Dunn and George E. EwingCite this: J. Phys. Chem. 1992, 96, 13, 5284–5290Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https://doi.o…
Flagstaff, AZ 86011 ABSTRACT-Seventy-eight taxa of diatoms were identified from the epiphytic community of Cla- dophoraglomerata in the Colorado River through Glen and Grand Canyons. Achnanthes affinis, Cocconeis pediculus, Diatoma vulgare, and Rhoicosphenia curvata made up 80% of the diatom epiphyton community within…
To date, CaVO 3- y has been reported and believed to be one of the typical metallic oxides. From our detailed study, however, it has been found that this system shows insulating properties with stoichiometric oxygen content. This insulator phase was obtained by oxidation of as-cast single crystals. The magnetic suscep…
The long quest for a VV triple bond has finally met with success, as shown by the synthesis of the title compound 1. A short intermetallic distance and high magnetic anisotropy indicate strong interaction between the vanadium centers. R = p-CH3C6H4.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSymmetrical and unsymmetrical quadruply aza bridged closely interspaced cofacial bis(5,10,15,20-tetraphenylporphyrins). 3. Interplanar distances, proton NMR chemical shifts, and the catalysis of the electrochemical reduction of oxygenRafik Karaman, Seungwon Jeon, Orn Almarss…
Vibrational assignments for α-syndiotactic polystyrene are made with the use of parallel and perpendicular polarization of uniaxially oriented film, and by comparison of vibrational data and assignments for toluene and atactic and isotactic polystyrene. Vibrational assignments are given for a cast film of β-syndiotact…
A spin-polarized electron gun for electron spectroscopies is described in detail. The gun consists of an electron source based on a negative electron affinity GaAs photocathode coupled to an appropriate transport electron optics. The gun has been designed with the aid of ray-tracing analysis and then accurately tested…
EXAFS measurements were performed on four sulfided catalysts with the same compn. as their 57Co-contg. counterparts which were previously characterized by Moessbauer emission spectroscopy. The Co species in Co/C catalysts with a Co-Mo-S-like Moessbauer emission spectrum after sulfidation at 373 K is similar to the spe…