We investigate the accuracy of several schemes to calculate ground-state correlation energies using the generator coordinate technique. Our test-bed for the study is the sd interacting boson model, equivalent to a 6-level Lipkin-type model. We find that the simplified projection of a triaxial generator coordinate state using the S 3 subgroup of the rotation group is not very accurate in the par...

Nanocrystalline ZnZr4(PO4)6 ceramics as an efficient catalyst have been used for the preparation of methyl 6-amino-5-cyano-4-aryl-2,4-dihydropyrano[2,3-c]pyrazole-3-carboxylates by the four component reaction of dimethylacetylenedicarboxylate, hydrazinehydrate, malononitrile and aromatic aldehydes in water at room temperature. In this research Nano-ZnZr4(PO4)6 coordinate with the active groups(...

We make four contributions to the literature on voter coordination and identities: First, we find that natural identities have a stronger negative influence on coordination than payoff relevant minimal identities. Second, communication and repeated interaction can significantly increase coordination in both cases. Third, we show that multiple natural identities negatively affect coordination, b...

The number of applications for central catadioptric systems, often called central panoramic systems, are increasing. Among these are surveillance systems, commercial systems for web navigation and robot localization and navigation. This works includes itself in the last case, and presents an analytical method for pose estimation using any central catadioptric system. Any known four points in th...

We study the pressure-driven phase transition from the four-coordinate wurtzite to the six-coordinate rocksalt structure in CdSe nanocrystals with molecular dynamics computer simulations. With an ideal gas as the pressure medium, we apply hydrostatic pressure to spherical and faceted nanocrystals ranging in diameter from 25 to 62 A. In spherical crystals, the main mechanism of the transformatio...

The noteworthy structural feature of the title complex, poly[acetonitrile-tetra-μ(2)-thio-cyanato-barium(II)digold(I)], {[Au(2)Ba(SCN)(4)(CH(3)CN)]}(n), is that the bis-(thio-cyanato)-aurate(I) anion adopts both monomeric and trimeric motifs. The trimer unit has an Au⋯Au distance of 3.1687 (3) Å. In both the monomeric and trimeric units, the Au(I) atoms are also bonded to two S atoms. Within th...

The first structurally characterized isobutyl-containing aluminoxane compound is presented. The Al10O6iBu16(mu-H)2 (I) cluster is produced from neat octakis-isobutyltetraluminoxane (Al4O2iBu8) at 80 degrees C in 6-8 h followed by slow crystallization. The crystal is triclinic (space group P1) with the molecule lying on an inversion center. This aluminoxane contains both nearly linear, 154(2) de...

In the last decade many studies examined egocentric and allocentric spatial relations. For various tasks, navigators profit from both kinds of relations. However, their interrelation seems to be underspecified. We present four elementary representations of allocentric and egocentric relations (sensorimotor contingencies, egocentric coordinate systems, allocentric coordinate systems, and perspec...

In the polymeric title complex, [Pb(2)(CH(3)CO(2))(2)(C(10)H(6)O(6)S(2))](n), the acetate anion functions in a chelating mode and both O atoms also coordinate to adjacent Pb(II) atoms. The naphthalene-1,5-disulfonate dianion, which lies on a center of inversion, is connected to four Pb(II) atoms. The bridging modes of the monoanion and dianion give rise to a three-dimensional coordination polym...