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Apache Point Observatory
The Apache Point Observatory (APO; obs. code: 705) is an astronomical observatory located in the Sacramento Mountains in Sunspot, New Mexico, United States, approximately south of Cloudcroft. The observatory is operated by New Mexico State University (NMSU) and owned by the Astrophysical Research Consortium (ARC). Access to the telescopes and buildings is private and restricted. History The ARC was formed in 1984 with the goal of building the 3.5 m telescope. It originally consisted of five institutions: New Mexico State University, University of Washington, University of Chicago, Princeton University, and Washington State University, some of which have since withdrawn. Several additional organizations have joined over time: Johns Hopkins University, University of Colorado, University of Virginia, Georgia State University, University of Oklahoma, University of Wyoming, and Brigham Young University. Funding for the 3.5 m and 0.5 m telescopes comes from the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Virginia
The University of Virginia (UVA) is a Public university#United States, public research university in Charlottesville, Virginia. Founded in 1819 by Thomas Jefferson, the university is ranked among the top academic institutions in the United States, with College admissions in the United States, highly selective admission. Set within the The Lawn, Academical Village, a World Heritage Site, UNESCO World Heritage Site, the university is referred to as a "Public Ivy" for offering an academic experience similar to that of an Ivy League university. It is known in part for certain rare characteristics among public universities such as #1800s, its historic foundations, #Honor system, student-run academic honor code, honor code, and Secret societies at the University of Virginia, secret societies. The original governing Board of Visitors included three List of presidents of the United States, U.S. presidents: Thomas Jefferson, Jefferson, James Madison, and James Monroe. The latter as si ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charge-coupled Device
A charge-coupled device (CCD) is an integrated circuit containing an array of linked, or coupled, capacitors. Under the control of an external circuit, each capacitor can transfer its electric charge to a neighboring capacitor. CCD sensors are a major technology used in digital imaging. In a CCD image sensor, pixels are represented by p-doped metal–oxide–semiconductor (MOS) capacitors. These MOS capacitors, the basic building blocks of a CCD, are biased above the threshold for inversion when image acquisition begins, allowing the conversion of incoming photons into electron charges at the semiconductor-oxide interface; the CCD is then used to read out these charges. Although CCDs are not the only technology to allow for light detection, CCD image sensors are widely used in professional, medical, and scientific applications where high-quality image data are required. In applications with less exacting quality demands, such as consumer and professional digital cameras, act ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echelle Grating
An echelle grating (from French ''échelle'', meaning "ladder") is a type of diffraction grating characterised by a relatively low groove density, but a groove shape which is optimized for use at high incidence angles and therefore in high diffraction orders. Higher diffraction orders allow for increased dispersion (spacing) of spectral features at the detector, enabling increased differentiation of these features. Echelle gratings are, like other types of diffraction gratings, used in spectrometers and similar instruments. They are most useful in cross-dispersed high resolution spectrographs, such as HARPS, PARAS, and numerous other astronomical instruments. History The concept of a coarsely-ruled grating used at grazing angles was discovered by Albert Michelson in 1898, where he referred to it as an "echelon". However, it was not until 1923 that echelle spectrometers began to take on their characteristic form, in which the high-resolution grating is used in tandem with a cro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cost-sharing Agreement
In taxation and accounting, transfer pricing refers to the rules and methods for pricing transactions within and between enterprises under common ownership or control. Because of the potential for cross-border controlled transactions to distort taxable income, tax authorities in many countries can adjust intragroup transfer prices that differ from what would have been charged by unrelated enterprises dealing at arm’s length (the arm’s-length principle). The OECD and World Bank recommend intragroup pricing rules based on the arm’s-length principle, and 19 of the 20 members of the G20 have adopted similar measures through bilateral treaties and domestic legislation, regulations, or administrative practice.World Bank pp. 35-51 Countries with transfer pricing legislation generally follow th''OECD Transfer Pricing Guidelines for Multinational Enterprises and Tax Administrations''in most respects, although their rules can differ on some important details. Where adopted, transfe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rothney Astrophysical Observatory
The Rothney Astrophysical Observatory (RAO) is an astronomical observatory located near the hamlet of Priddis, Alberta, Canada, about southwest of Calgary. The observatory is owned and operated by the University of Calgary (UC), and was dedicated in 1972. The facility is used for research, undergraduate and graduate teaching, and public outreach. Research performed at the RAO included a variable star search program, follow-up observations of variable star discoveries, and detailed investigation of binary stars. An outstanding minor planet search program was also performed with comet discoveries by Rob Cardinal. The RAO now participates in many follow-up observation programs, including the Quark Nova project. Telescopes * The A.R. Cross Telescope (ARCT) is a Ritchey-Chrétien design dedicated in 1987. It is attached to an unusual altitude-altitude (alt-alt) mount which allows greater access to northern skies than other mounts. It was originally equipped with metal mir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Primary Mirror
A primary mirror (or primary) is the principal light-gathering surface (the objective) of a reflecting telescope. Description The primary mirror of a reflecting telescope is a spherical or parabolic shaped disks of polished reflective metal (speculum metal up to the mid 19th century), or in later telescopes, glass or other material coated with a reflective layer. One of the first known reflecting telescopes, Newton's reflector of 1668, used a 3.3 cm polished metal primary mirror. The next major change was to use silver on glass rather than metal, in the 19th century such was with the Crossley reflector. This was changed to vacuum deposited aluminum on glass, used on the 200-inch Hale telescope. Solid primary mirrors have to sustain their own weight and not deform under gravity, which limits the maximum size for a single piece primary mirror. Segmented mirror configurations are used to get around the size limitation on single primary mirrors. For example, the Giant Mag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Focus (optics)
In geometrical optics, a focus, also called an image point, is a point where light rays originating from a point on the object converge. Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle. This non-ideal focusing may be caused by aberrations of the imaging optics. In the absence of significant aberrations, the smallest possible blur circle is the Airy disc, which is caused by diffraction from the optical system's aperture. Aberrations tend to worsen as the aperture diameter increases, while the Airy circle is smallest for large apertures. An image, or image point or region, is in focus if light from object points is converged almost as much as possible in the image, and out of focus if light is not well converged. The border between these is sometimes defined using a "circle of confusion" criterion. A principal focus or focal point is a special focus: * For a lens, or a spherical or parabolic mirror, it is a point ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alt-azimuth Mount
An altazimuth mount or alt-azimuth mount is a simple two-axis mount for supporting and rotating an instrument about two perpendicular axes – one vertical and the other horizontal. Rotation about the vertical axis varies the azimuth (compass bearing) of the pointing direction of the instrument. Rotation about the horizontal axis varies the altitude angle (angle of elevation) of the pointing direction. These mounts are used, for example, with telescopes, cameras, radio antennas, heliostat mirrors, solar panels, and guns and similar weapons. Several names are given to this kind of mount, including altitude-azimuth, azimuth-elevation and various abbreviations thereof. A gun turret is essentially an alt-azimuth mount for a gun, and a standard camera tripod is an alt-azimuth mount as well. Astronomical telescope altazimuth mounts When used as an astronomical telescope mount, the biggest advantage of an alt-azimuth mount is the simplicity of its mechanical design. The primary disadv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
D70050914 15 ApolloLLR
D7, D07, D.VII, D VII, D.7 or D-7 may refer to: Arts and entertainment * D7, a chord (music) * D7, a note in the whistle register * ''D-7'' (Wipers song), a song by the Wipers from the 1980 album '' Is This Real?'' ** Covered by Nirvana on the 1992 album '' Hormoaning'' * ''D-7'', a fictional ''Star Trek'' Klingon starship class Businesses and organisations * Dinar Líneas Aéreas (1992–2002), IATA airline designator D7 * AirAsia X, IATA airline designator D7 * Digital 7, a group of national governments seeking to strengthen the digital economy Places * D7 road (Croatia), a state road * D7 motorway (Czech Republic) * A Dublin postal district Science, technology and mathematics Military *D.VII aircraft (other), a number of aircraft **Fokker D.VII, a German World War I fighter aircraft * HMS ''Patroller'' (D07), a 1943 British Royal Navy escort aircraft carrier * HMS ''D7'', a Royal Navy submarine launched in 1911 Transportation and vehicles * Bavarian D VI ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brigham Young University
Brigham Young University (BYU, sometimes referred to colloquially as The Y) is a private research university in Provo, Utah. It was founded in 1875 by religious leader Brigham Young and is sponsored by the Church of Jesus Christ of Latter-day Saints (LDS Church). BYU offers a variety of academic programs including those in the liberal arts, engineering, agriculture, management, physical and mathematical sciences, nursing, and law. It has 186 undergraduate majors, 64 master's programs, and 26 doctoral programs. It is broadly organized into 11 colleges or schools at its main Provo campus, with some colleges and divisions defining their own admission standards. The university also administers two satellite campuses, one in Jerusalem and one in Salt Lake City, while its parent organization the Church Educational System (CES) sponsors sister schools in Hawaii and Idaho. The university is accredited by the Northwest Commission on Colleges and Universities. Almost all BYU students ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
