... Contamination on optical surfaces degrades the throughput of an optical system. ... Contamination is particularly pernicious on the unprotected aluminum that is commonly used on the large first-surface mirrors of reflecting telescopes. ... During that period, the covers of their protective cases is opened whenever the 3.5-m telescope primary mirror cover is opened for nighttime observing. ... CO2 clean exposed mirrors in SS case. ... Light scattering measurements performed on cleaned mirrors. ...

... Science User Portal . ... ESO, the European Southern Observatory . ... Member States . ... United Kingdom . Travel and Contacts . Travel to ESO Headquarters . ... Green ESO . ... Survey Telescopes . ... ESO Science Newsletter . ... VLT Unit Telescopes Names . ... ESO 3.6-metre telescope . ... MPG/ESO 2.2-metre telescope . ... ESO 1-metre Schmidt telescope . ... The VISTA mirror . ... Staff clean the 8.2-metre mirror of one of the Very Large Telescope's Unit Telescopes at Paranal Observatory. ...

... Heliostat is cleaned and wrapped in plastic sтАж . Sidebar Left . Sidebar Top . No Sidebar . Sidebar Bottom . Sidebar Right . ... Title: Heliostat is cleaned and wrapped in plastic sheeting. Description: The scaffolding is removed, so further access will be impossible until rebuilding is complete. NOTE: All images and movies are copyright and must not be reproduced or mirrored in any form without written permission. ... Heliostat is cleaned and wrapped in plastic sheeting. ...

ATM Forum Message . Forums: . ... Do I Have A Dirty Polished Mirror? ... Posted by Scott Pelger on August 4, 2006 19:30:27 UTC . ... Polished mirror - bobmay - August 6, 2006 - 23:34 UTC . dirty mirorr - spelger - August 7, 2006 - 19:28 UTC . ... do i have a dirty polished mirror? - rick_crockett - October 21, 2006 - 06:05 UTC . ... www.astronomy.net . ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... Home Articles Optical Surface Cleaning Procedure . ... Clear Sky Chart . This Month's Sky . ... Beyond New York City . ... Optical Surface Cleaning Procedure . Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . Observing Resources for Amateur Astronomers - Part 2: Intermediate Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

Next: Sample instrument files Up: Instrument configuration and Previous: Other detectors: DET= . ... Possible values are 'CLEAN' , if the mirrors have been re-coated or cleaned within two weeks of the observing run, and/or a flashlight beam is barely visible on optical surfaces; 'AVERAGE' , if a flashlight beam is plainly visible on the optical surface, but the dirt is not very bad; and 'DIRTY' , if shining a flashlight beam on the primary produces a sensation of revulsion in a trained observer. ...

... User Guide ] Task: clean Purpose: Apply Hogbom, Clark or Steer CLEAN algorithm to a map Categories: deconvolution CLEAN is a MIRIAD task that performs a hybrid Hogbom/Clark/Steer Clean algorithm, which takes a dirty map and beam, and produces an output map which consists of the Clean components. This output can be input to SELFCAL to self-calibrate visibilities, or input to RESTOR to produce a "clean" image. ... Key: map The input dirty map, which should have units of Jy/beam. No default. ...

... Рубашка Clean Cut Модель: CC1064 New Rooney Flannel Состав: 60% хлопок 40% полиэстер На пуговицах Длинные рукава Модель: 28714324 . ... Рубашки с длинными рукавами . ... Кровать-машина Гоночная зеленая Пятая точка - яркая и практичная модель с ортопедическим основанием. ... Цвет: Зеленый . ... Комплект нижнего белья для мальчика зеленый с трусами в полоску КотМарКот - Котмаркот - Котмаркот . ... Свитер D-xel Модель: 2737094 - D-xel - D-xel . ...

... For the Corner Method, Clean_lc was originally a FORTRAN 77 program developed by Steve Snowden and Kip Kuntz in 2005-6. ... Clean_lc's purpose is to clean a light curve by creating a histogram of rate values from the light curve, finding the most likely value assuming that to be similar to the mean of the quiescent rate, then fitting a Gaussian to a small window around that value in the histogram to determine the true mean and dispersion of the quiescent background rate. ...

... Previous: ESO C Library for an Image Processing Software Environment (eclipse) . ... A new CLEAN-type algorithm searches for model components not in the dirty image but in the multi-resolution wavelet transform of the dirty image based on the dirty beam. ... The improvement of this prototype Wavelet CLEAN, which does convolve with the dirty beam, can be attributed to a suppression of noise and aliasing in the dirty image by use of information in the sidelobes of the whole image domain. ...

... Apache HTTP Server Version 2.2 . Apache > HTTP Server > Documentation > Version 2.2 > Programs . ... htcacheclean is used to keep the size of mod_disk_cache 's storage within a certain limit. This tool can run either manually or in daemon mode. ... You can stop the daemon cleanly by sending it a TERM or INT signal. ... Options . ... This assumes that the Apache web server is not running (otherwise you may get garbage in the cache). ... Specify limit as the total disk cache size limit. ...

The Kermit Dewar, open for assembly of the electornics at UH. Inside the dewar, looking at the detector mount (left) and the gold M1 mirror (in back, visible as two gold squares). Katie Whitman, hard at work assembling the motor drive cables. ... Another view of the dewar interior . Jeff Kuhn cleans the Hawaii 2 detector immediately before installing it in the dewar. Jeff Kuhn installs the detector onto the fanout board. ...

... Views of the Solar System is maintained at several different sites on the Internet. ... This is the primary site for "Views of the Solar System." ... This site is maintained by Lee Burnside ; see also their home page . ... You are permitted to set up a Views of the Solar System mirror site as long as you follow the following guidelines: Views of the Solar System may be distributed on the World Wide Web as long as it is used for non-profit applications and the pages are not modified. ...

... 2005 June 6 . Saturn: Dirty Rings and a Clean Moon . Credit: Cassini Imaging Team , SSI , JPL , ESA , NASA . Explanation: Eating surface ice from Enceladus might be healthier than eating ice from Saturn's rings -- it certainly appears cleaner. From their apparent densities and reflectance properties, both the rings of Saturn and its shiniest moon, Enceladus , are thought to be composed predominantly of water ice . ... About APOD | ... NASA Official: Jay Norris. ...

... Saturn: Dirty Rings and a Clean Moon . ... Credit Copyright: Cassini Imaging Team , SSI , JPL , ESA , NASA Explanation: Eating surface ice from Enceladus might be healthier than eating ice from Saturn's rings -- it certainly appears cleaner. ... For reasons that are not yet understood, however, many of Saturn's ring particles have become partly coated with some sort of relatively dark dust, while the surface of Enceladus appears comparatively bright and clean. ... In the Shadow of Saturns Rings . ...

On 1 February 2002 this Mirror was upgraded from NVSSlist v2.10 to NVSSlist v2.17 . ... This form searches the source catalog produced by the NRAO/VLA Sky Survey (NVSS). ... Object name [optional] : . ... Search radius and verification halfwidth in arcseconds [Optional] : . ... Enter a list of positions to search: . ... The contents of the NVSS source catalog and the techniques used by NVSSlist to derive error estimates and other parameters are described here. ...

... Primary Mirror after being stripped and recoated in 3-layer protected silver (NiCr-Ag-NiCr) on 12 September 2009. image: CIMG7901.jpg . ... Primary Mirror held by (yellow) handling tool being lifted off transport container (note the tennis balls it rested on), to be put on wash cart during unpacking at VISTA on 29 March 2008. image: P1060207.jpg (taken 29/03/08) . ... VISTA Mirror Blank: Shape of 4m primary mirror blank being tested at Schott Glas in Germany. image: M1_shape_checking-300dpi.jpg . ...

Alexander S. Dmitriev . Institute of Radioengineering and Electronics of the Russian Academy of Sciences . Mokhovaya st., 11, Moscow, 103907, Russia. ... Moscow Institute for Physics and Technology . ... The relationship between the problem of cleaning chaotic signals off noise and the information properties of the signals is shown. Some methods for chaotic signal cleaning are considered. The efficiency of these methods is evaluated by computer simulation. ...

In 2005 we have made some attempts at cleaning up the rfi in the 327 Mhz receiver band. ... sept05)It produces combs at: . ... It is center centered on the 40Mhz comb (at 320 Mhz in the 327 band). ... A 1 Mhz comb. ... See: 1 Mhz comb in 327 receiver (coming from AC units in dome) . ... Azimuth dependence of birdies in the 327 receiver ( more info ). ... The 327 Az swings showed that the 327 Mhz birdies have an azimuth dependence (which means they are coming from outside the dome). home_~phil ...

. Приложение к лекции для студентов . Верходанов О.В. Рис.12. Пример работы алгоритма чистки. На верхнем рисунке приводится модельное изображение, на среднем - грязная карта, на нижнем - изображение, восстановленное с помощью CLEAN. Рисунок воспроизведен из работы Стиэра и др. (1984). vo @ sao.ru ( Oleg Verkhodanov ) .