Materials Literature
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The dimers 1 can be prepared in 70% yield by Glaser coupling, if the reaction is carried out in the presence of 4,4′-bipyridine as template. With a tripyridyltriazine as template, formation of the corresponding trimer (52%) is favored. Without template the reaction is unselective: Dimer and trimer are formed together…
Higher multipole corrections to the dipole-approximation result for angular distributions of photoelectrons at low photon energies are discussed. The first-order corrections lead to a simplified formula for the angular distribution, which extends the dipole results for linearly, unpolarized, and partially polarized li…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA tetranuclear hydroxo-bridged copper(II) cluster of the cubane type. Preparation and structural and magnetic characterization of tetrakis[(2,2'-bipyridyl)hydroxocopper(II)] hexafluorophosphateJorunn Sletten, Astrid Soerensen, Miguel Julve, and Yves JournauxCite this: Inorg.…
Two quasiperiodic planar patterns with fivefold symmetry are derived from the root lattice A 4 in 4-space. A detailed analysis of the geometry of the A 4 Voronoi complex and its dual complex is presented with special emphasis on fivefold symmetry. By means of the general dualization method, 2D patterns are obtained, o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTObservation of strain-induced β form in poly(β-hydroxyalkanoates)W. J. Orts, R. H. Marchessault, T. L. Bluhm, and G. K. HamerCite this: Macromolecules 1990, 23, 26, 5368–5370Publication Date (Print):December 1, 1990Publication History Published online1 May 2002Published inis…
Intrinsic defects have been produced in yttria- and calcia-stabilized zirconia (YSZ or CaSZ) single crystals either by x irradiation at 300 and 77 K or by thermochemical reduction at 1370, 1670, and 1870 K. The spectroscopic properties of the defects have been studied by electron paramagnetic resonance (EPR), optical…
Despite strong twisting of the conjugated system, the tetrathiafulvalene homologue 1 reacts with the electron acceptor tetracyanoquinonodimethane to give the dication 12⊕. The anthracene moiety is embedded in the 12⊕ [(TCNQ)4]2⊖, and the dithiol rings are twisted 86° with respect to the anthracene plane: The 1:4 stoic…
Domain boundaries (DB's) in convection patterns are studied near the onset of convection within the framework of amplitude equations of the Newell-Whitehead-Segel type. It is demonstrated that DB's of an arbitrary direction are possible between domains occupied by convection rolls with different orientations. Those DB…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew route to unsymmetrical phthalocyanine analogs by the use of structurally distorted subphthalocyaninesNagao Kobayashi, Ryoko Kondo, Shinichiro Nakajima, and Tetsuo OsaCite this: J. Am. Chem. Soc. 1990, 112, 26, 9640–9641Publication Date (Print):December 1, 1990Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR and crystallographic studies of a p-sulfonatocalix[4]arene-guest complexSeiji Shinkai, Koji Araki, Tsutomu Matsuda, Nobuaki Nishiyama, Hirotaka Ikeda, Isao Takasu, and Masakazu IwamotoCite this: J. Am. Chem. Soc. 1990, 112, 25, 9053–9058Publication Date (Print):December…
It must be measured the height that is obtained in the peaks indicated in the diffractograms of the compounds: CaO, SÍO2, β-C2S γ-C2S, C3A, C2F and C4AF, with the finality of study their mutual influences, and also study the aluminoferrites over such bicalcic silicates, obtained from differents raw mix. The adquired k…
Two factors have determined the actual deterioration state of the Cathedral of Cádiz, one is natural and the other is anthropogenic. On one hand, the presence of salts conditioned by atmospherical environment and saline solutions of the rising damp; on the other hand, the vicissitudes suffered by the temple during its…
The hidric behaviour of two slaty rocks from the NW of Spain (phyllite of Rande —La Coruña— and slate of Luarca —Asturias—) used as ornamental and roof slate is studied. An experimental methodology for proper interpretation of the hidric phenomena to which they can be subjected due to their particular use in the build…
This paper attempts to describe the recently approved UNE standards through a systematic analysis of the main specifications therein contained and the values considered for each of them, as well as the drafts for ISO and EN concrete block standards. Furthermore, the study tries to place the set of ISO standards in the…
It is argued that powders have so many particles per unit volume that they can be treated in a manner similar to conventional liquids. They have an entropy S(V,N), but as energy is not important the place of temperature delta E/ delta S is taken by delta V/ delta S. Equations capable of giving plug flow are derived. I…
The presence of methanogens Methanobacterium arboriphilus, Methanobacterium bryantii, or Methanobrevibacter smithii increased the level of cellulose fermentation by 5 to 10% in cultures of several genera of anaerobic fungi. When Neocallimastix sp. strain L2 was grown in coculture with methanogens the rate of cellulose…
Pitting of single crystals of Al and homogenized Al‐Cu alloys has been studied on low index surfaces as a function of surface orientation and alloy content in . The potentials at which pitting phenomena occurred were determined potentiodynamically using single‐cycle pitting tests at a scan rate of 0.5 mV/s. Galvanosta…