Towards celestial sources above 1 THz with a heterodyne receiver based on a hot-electron bolometer mixer Sergey Ryabchun, Ivan Tretyakov, Matvey Finkel, Natalia Kaurova, Boris Voronov and Gregory Gol'tsman HOT-ELECTRON BOLOMETER (HEB) MIXER Scient ific and Educatio nal Radiophysics Center Mo scow State Pedago gical University Mo scow, Russia FIRST GROUND-BASED OBSERVATION WITH HEB MIXERS BEYOND 1 THz Submillimeter Telescope ...

... Pour profiter au mieux d'une image, une position confortable est toujours prИfИrable ! ... Tube optique Une finition satisfaisante S'il y a v ait un reproche Ю faire au Star Blast, il concernerait sa formule optique : celle d'un Newton trХs ouvert, qui nИcessite de frИquents rИglages pour des observations optimisИes. ... DИbuter avec le Star Blast est donc formateur puisqu'il permet de comprendre le fonctionnement d'un tИlescope et de dИmystifier les manoeuvres d'alignement des optiques. ...

... The then president of the Society, Mr. Robert Burke, appointed a committee of eight or ten members, most of whom had made smaller mirrors, as an instrument committee, with Mr. Thorpe as chairman. ... Seriously, the best practicable solution seemed to be to build a machine to do the grinding and polishing. ... It was decided to grind the edges of the mirror to make it truly circular, as the rough cast glass was some 3/8 inch longer on one diameter than on the other. ...

... Printed in U.S.A. NATURE OF NUCLEAR RINGS IN UNBARRED GALAXIES : NGC 7742 AND NGC 7217 O. K. Sil'chenko and A. V. Moiseev Special Astrophysical Observatory, Nizhnij Arkhyz 369167, Russia; moisav@sao.ru Received 2005 ... Isaac Newton Institute of Chile, Moscow Branch, Moscow 119992, Russia; olga@sai.msu.su ABSTRACT We have studied an unbarred Sb galaxy with a nuclear star-forming ring, NGC ... 1 7217, Pos. ... Left: Stellar velocity dispersion map for NGC 7217 according to the SAURON...

ELT MASS/DIMM instrument for atmospheric turbulence measurements. ... 1.2 Principal geometry of MASS­DIMM device . ... The next chapter is a guide for alignment of the optical scheme elements ­ the op eration which is mandatory after the device assembly or while installing the device on the telescop e. Exit pupil optics tuning (MASS segmentator and DIMM mirrors), fo cusing and lateral p ositioning of the Fabry lens, checking the entrance pupil p osition are the sub jects of particular attention. ...

... В то время это был крупнейший телескоп в Европе, и молодые астрономы Г.А.Шайн и В.А.Альбицкий первыми начали на нем спектральные наблюдения. ... Обсерваторию необходимо было отстраивать заново. 30 июня 1945 года, по инициативе Академии Наук СССР, правительство решило преобразовать Симеизское отделение Пулковской обсерватории в самостоятельную Крымскую Астрофизическую Обсерваторию и построить для нее современный телескоп-рефлектор с зеркалом диаметром 2,6 метра. ... Руководит обсерваторией член корр....