Conditions of Pressure Wave Focusing in a Bubbly Wedge

Acoustical Physics - Dynamics of pressure waves in a flat channel with a sloping boundary between bubbly and pure liquids is investigated. It is shown that, at the boundary between water–air...     

Propagation of Detonation Waves in Bubbly Liquids in Suddenly Widening Channels

Acoustical Physics - The propagation of detonation waves in a channel filled with a bubbly liquid that suddenly widens is investigated. Possible scenarios for the dynamics of detonation waves after...     

Effect of porous structure of activated carbon electrodes on characteristics of double-layer supercapacitors

Porous structure of electrode materials was studied and the role played by macroporous in electrodes of model double-layer supercapacitors was experimentally analyzed. It was shown that the excess macropore volume in electrodes has an adverse effect and, on the whole, reduces in a complicated way the specific electrochemical characteristics of these devices. This makes necessary to develop the optimal electrode structure as regards not only nanoporous, but also macroporous structure.     

Coordination Numbers of Central Atoms in Coordination Compounds

A sample of structurally characterized 10000 complexes (X-ray diffraction data) was carefully selected from available databases for analysis of coordination numbers (CNs) of their central atoms (complexing agents). The coordination numbers of various chemical elements are tabulated for their different oxidation numbers (ONs). Variations in CN with the ordinal number of an element in the Periodic Table were followed. A general distribution of the sample complexes over the CNs of the central atom, as well as their distributions for particular ONs, is displayed. References to particular coordination compounds are given for extreme and very uncommon CNs of a central atom with different ONs. A general pattern of the observed variations in the CN of chemical elements can be useful for predicting the properties of complexes, constructing their stability models, designing compounds with rich and unique properties, and developing retrieval and graphic tools for chemical databases.