INSTRUMENTAL POLARIZATION: CROSS COUPLING AND HYBRID CONVERSION ISSUES Jim Cordes and Joe Lazio 2 December 1992 Arecibo Upgrade Notes Summary The standard Gregorian feed and receiver system will yield linear polarizations at the output of the orthomode transducer OMT and after at least the rst stage of ampli cation. ... As above, a linearly polarized source will show Q; U varying as cos 2 f and sin 2 f , with f being the orientation angle of the feed. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Stars . ... Telescopes and Observatories . ... The majestic star-forming region in the Lagoon Nebula. The pale ring to the right is an internal reflection in the telescope.€а (Image credit: ESO/ VPHAS+/ V. Kalari and J. Vink (Armagh Observatory) . ... The 18 component images were further processed twice. ... Venu and his colleagues use images like this to identify individual young forming stars in the Lagoon Nebula and determine their ages. ...

... The Magazine . ... Get to Know the Night Sky . ... Cosmic particle accelerators get things going . Cluster has shown that narrow shocks may be vital to kick-starting the acceleration process in exploding stars, young stars, black holes, and whole galaxies. ... For example, the Large Hadron Collider at CERN employs a series of small accelerators to get its particles up to speed before injecting them into the main 17-mile-circumference (27 kilometers) ring for further acceleration. ...

... Depuis quelques semaines, l'arrivИe des Lightbridge de Meade suscite la tentation chez tous les amateurs. ... La sИrie Lightbridge fait face Ю une concurrence asiatique dans la mЙme gamme de prix. ... La fluiditИ du mouvement sur cet axe est d'une douceur exemplaire. ... Pour chercher les objets, l'instrument est pourvu d'un viseur type "point rouge". ю l'usage, celui-ci ne donne pas pleine satisfaction : son support sur le tube est assez souple, ce qui rend difficile son rИglage prИcis. ...

... BLUE STRAGGLER STARS are unusually hot and bright stars found in the cores of ancient star clusters known as globulars. ... BACKGROUND (from wikipedia): Blue straggler stars are stars in open or globular clusters that are hotter and bluer than other cluster stars having the same luminosity. ... There is evidence in favor of this view, notably that blue straggler stars appear to be much more common in dense regions of clusters, especially in the cores of globular clusters. ...

... Nikolaev 2.8 USNO 104 Italy, San 0.40 21 x 21' 2.5 10 32 0.253 0.436 Marccello 2.0 GSC 106 Slovenia, 0.36 36 x 36' 2.0 2235 9264 0.307 0.295 Crni vrh 2.4 USNO 113 Germany , 0.50 13 x 10' 2 42 283 0.260 0.319 Schonbrunn 2.3 USNO 114 213 1172 0.260 0.222 118 Slovakia, 0.57 14 x 10' 1.7 7 42 0.165 0.077 Modra 3.3 USNO 130 Italy, 0.4 15 x 10' 1.0 9 36 0.284 0.275 Lumezzane 1.8 ... 1.8 UCAC A24 New Millennium 0.36 12 x 12' 1.4 86 399 0.341 0.284 Obs., ... 3.5 UCAC H15 ISON-NM Obs., ...

Special Option #1 and #3 Summary + Precision EW e Polarization E3 - Linear Collider Plenary Snowmass 2001 July 17th, 2001 Snowmass , Colorado Eric Torrence University of Oregon З Giga-Z З Beam Energy З Polarimetry Please note: I am a virtual expert... http://www.cern.ch/ torrence /talks/SM01_SO13 Eric Torrence Snowmass July ... Giga-Z Outlook З Substantial improvement in sin З Modest improvement in m W З Dramatic improvement in W ? ... Eric Torrence Snowmass July 2001 ...