Biological air filtration is a promising technique for air-quality control in closed environments in space and on Earth, and it offers several advantages over existing techniques. However, to apply it in these environments, specific criteria have to be met. A concept for biological air filtration in closed environments was developed and tested by

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The partition function for atoms in a gas with partial ionization is obtained by assuming that the internal and atomic linear energy densities are equal, and considering that the kinetic energy per degree of freedom is sufficient to ionize the upper levels of the atoms, and, at the same time, approximating the sum by an integral, which we solve

We present interferometric imaging at 33 GHz of the Corona Borealis supercluster, using the extended configuration of the Very Small Array. A total area of 24 deg2 has been imaged, with an angular resolution of 11 arcmin and a sensitivity of 12 mJy beam-1. The aim of these observations is to search for Sunyaev-Zel'dovich (SZ) detections from known

We select 4 pointings for the Wide Field Camera (WFC) mounted at the prime focus of the 2.5m Isaac Newton Telescope (INT), located at the Roque de Los Muchachos Observatory, La Palma. We carried out observations from October 12 to October 14, 1999. (1 data file).

The observations were obtained with the automated 60cm telescope of Konkoly Observatory, Svabhegy, Budapest equiped with a Wright 750x1100 CCD using BV(RI)c filters, between 25 September and 14 December in 2003. (5 data files).