... Determination of the Permissible Solutions Area by Image Reconstruction from a few Projections: Method 2­CLEAN DSA Michail I. Agafonov Radiophysical Research Institute (NIRFI), 25 B.Pecherskaya st., Nizhny Novgorod, 603600, Russia, E­mail: agfn@nirfi.nnov.su Abstract. ... Application The problem requires the solution of the equation G = H # F (+noise) , (1) where F (x, y) is the object brightness distribution, H(x, y) is the fan (dirty) beam, and G(x, y) is the dirty (summary) image. ...

... Panoramic spectroscopy of the sample of 80 nearby lenticular galaxies is presented. ... By comparing the subsample of the S0s with the chemically distinct nuclei to the total sample of nearby S0s (Fig. 1), we have assured that the chemically distinct nuclei are always younger than the surrounding bulges: the mean age difference between the chemically distinct nuclei and their surrounding bulges is 2.8 Gyr while the age difference between the nuclei and the bulges for the whole sample is only 1 Gyr. ...

... May 1998 Date Field Exposure NObj Comments 980519 sgp171 3x1200s 87 980523 sgp173 5x1200s 96 980523 sgp172 3x1200s 82 June 1998 Date Field Exposure NObj Comments 980618 sgp248 6x1200s 119 clear ,1.8arcsec 980626 sgp208 3x900s 70 ended in twilight Sept 1998 Date Field Exposure NObj Comments 980913 sgp249 4x900s 136 (s1) Clear , 2arcsec 980913 sgp180 3x1200s 104 980913 sgp181 3x1200s 91 (s1) 980913 sgp182 ...

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... Planets, moons, asteroids and comets contain resources such as water and minerals, valuable to astronauts and potentially to Earth, with other elements such as platinum as a byproduct of the extraction. ... Lewis hoped we could defray cost s b y "bringing inexpensive products down to Earth. ... We could make travel to Mars cheaper by "bringing just enough fuel [to get there], then use the Martian CO2 atmosphere to go home. One ton of equipment will be able to produce 100 tons of fuel." ...