... 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. ...

... разработка теории и методов расчета лучевых дифференциалов первого, второго и третьего порядков в градиентных оптических системах; . ... разработка методов расчета геометрических аберраций второго и третьего порядка осесимметричных оптических систем, содержащих асферические поверхности и градиентные среды типа "псевдоаксикон"; . ... получены формулы для расчета смещения изображения и геометрических аберраций второго порядка в градиентных оптических системах с малыми нарушениями осевой симметрии; . ...

Winer Observatory P.O. Box 797, Sonoita, Arizona 85637-0797, USA . ... Irvin M. Winer . ... Winer . ... The Irvin Marvin Winer Memorial Mobile Observatory, Inc. was named upon its incorporation in 1983 after Irvin M. Winer. The Winer Scientific Director, Mark Trueblood, met Irv at Wesleyan University in 1971, when Mark had just begun his graduate studies in physics and Irv had just completed his Ph.D. and was staying on as an assistant professor. ... 2013 Winer Observatory. ...

This module provides mmap()ing of a statically configured list of frequently requested but not changed files. Status: Experimental . ... Compatibility: Available in Apache 1.3 and later. ... You can easily create a broken site using this module, read this document carefully. mod_mmap_static maps a list of statically configured files (via MMapFile directives in the main server configuration) into memory through the system call mmap() . ... Context: server-config . ... Module: mod_mmap_static . ...

Click for a video of the pendulum . ... In 1851 Leon Foucault (1819-1868) was made famous when he devised an experiment with a pendulum that demonstrated the rotation of the Earth. Joseph Ashbrook's book, The Astronomical Scrapbook , (Cambridge University Press, 1984) has a short chapter on Foucault's contributions to astronomy. ... Click here for more a detailed pdf document (5MB) about the University of Louisville's Foucault pendulum along with technical notes and the original working drawings. ...

The Archeops experiment aimed at measuring the cosmic background emitted just after the Big Bang. The study of this radiation is essential to obtain precise information on the evolution of the Universe: density, Hubble constant, age of the Universe.. To achieve this goal, measurements have been done with devices cooled down at 100mK temperature placed at the focus of a warm telescope. ... 28960 visitors . ...