The first continuous silver polyhedra framework containing four kinds of coordination spheres has been successfully prepared by the reaction of silver(I) nitrate and 4(1H)-pyridone-3-sulfonic acid. This polyhedra framework is constructed from four kinds of silver(I) polyhedra by sharing corners, edges and faces.

A novel compact circular-polarization (CP) operation of the square microstrip antenna with four slits and a pair of truncated corners is proposed and investigated. Experimental results show that the proposed compact CP design can have an antenna-size reduction of about 36% as compared to the conventional corner-truncated square microstrip antenna at a given operating frequency. Also, the requir...

W.K. Kellogg Biological Station, Michigan State University, Hickory Corners, MI 49060, USA Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI 48824, USA Department of Integrative Biology, Michigan State University, East Lansing, MI 48824, USA Department of Mathematics, Michigan State University, East Lansing, MI 48824, USA Department of Earth and Environmental Sc...

The structure of the title polymer, }[Mg(C6H14N2O6P2)(H2O)4]·0.5H2O} n , is based on centrosymmetric MgO6 octahedra, which are linked by [(piperazine-1,4-diium-1,4-di-yl)bis-(methyl-ene)]di-phospho-nate ligands, forming chains parallel to [1-1-1]. These chains are connected via hydrogen bonds primarily formed between the phospho-nate groups and water mol-ecules. The latter constitute four of th...

Abstract. In this paper we investigate theoretically an approximation technique for avoiding the crowding phenomenon in numerical conformal mapping. The method applies to conformal maps from rectangles to "long quadrilaterals," i.e., Jordan domains bounded by two parallel straight lines and two Jordan arcs, where the two arcs are far apart. We require that these maps take the four corners of th...

Many important image cues such as 'T'-,'X'and 'L'junctions have a local two-dimensional structure. Conventional edge detectors are designed for one-dimensional 'events'. Even the best edge operators can not reliably detect these two-dimensional features. This contribution proposes a solution to the two-dimensional problem. In this paper, I address the following: • 'L'-junction detection. Previo...

The article provides a statistical analysis of the data on accounting for penalty corners in field hockey. As many team sports, one decisive moments and very important playing situation is corners. Of total number goals scored international competitions, during corners, third them lead to goal. presents results successful delivery corner, its correct performance, which depends three main compon...