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PALFA Survey
PALFA is a large-scale survey for radio pulsars at 1.4 GHz using the Arecibo 305-meter telescope and the ALFA multibeam receivers. It is the largest and most sensitive survey of the Galactic plane to date. Introduction Most of the advances in pulsar astronomy were due to the discovery of new objects. A major increase in search sensitivity has already started a new era of discovery at the Arecibo Observatory. This increase in search sensitivity is due first and foremost by the ALFA receiver and the pulsar surveys it makes possible, which are now being carried by the Pulsar Consortium using the Arecibo 305 m radio telescope. Preliminary estimates (see below) indicate that the Arecibo Galactic plane survey using ALFA could find many hundreds of new pulsars. As of November 2019, the survey had already discovered a total of 192 new pulsars. The survey is targeting low Galactic coordinate system, Galactic latitudes (, b, ≤5°) in the Galactic coordinate system, Galactic longitude ra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Galactic Coordinate System
The galactic coordinate system is a celestial coordinate system in spherical coordinates, with the Sun as its center, the primary direction aligned with the approximate center of the Milky Way Galaxy, and the fundamental plane parallel to an approximation of the galactic plane but offset to its north. It uses the right-handed convention, meaning that coordinates are positive toward the north and toward the east in the fundamental plane. Spherical coordinates Galactic longitude Longitude (symbol ) measures the angular distance of an object eastward along the galactic equator from the Galactic Center. Analogous to terrestrial longitude, galactic longitude is usually measured in degrees (°). Galactic latitude Latitude (symbol ) measures the angle of an object northward of the galactic equator (or midplane) as viewed from Earth. Analogous to terrestrial latitude, galactic latitude is usually measured in degrees (°). Definition The first galactic coordinate system was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cornell University Center For Advanced Computing
The Cornell University Center for Advanced Computing (CAC), housed at Frank H. T. Rhodes Hall on the campus of Cornell University, is one of five original centers in the National Science Foundation's Supercomputer Centers Program. It was formerly called the Cornell Theory Center. Establishment The Cornell Theory Center (CTC) was established in 1985 under the direction of Cornell Physics Professor and Nobel Laureate Kenneth G. Wilson. In 1984, the National Science Foundation began work on establishing five new supercomputer centers, including the CTC, to provide high-speed computing resources for research within the United States. In 1985, a team from the National Center for Supercomputing Applications began the development of NSFNet, a TCP/IP-based computer network that could connect to the ARPANET at Cornell University and the University of Illinois at Urbana–Champaign. This high-speed network, unrestricted to academic users, became a backbone to which regional networks would ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pulsars
A pulsar (from ''pulsating radio source'') is a highly magnetized rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles. This radiation can be observed only when a beam of emission is pointing toward Earth (similar to the way a lighthouse can be seen only when the light is pointed in the direction of an observer), and is responsible for the pulsed appearance of emission. Neutron stars are very dense and have short, regular rotational periods. This produces a very precise interval between pulses that ranges from milliseconds to seconds for an individual pulsar. Pulsars are one of the candidates for the source of ultra-high-energy cosmic rays. (See also centrifugal mechanism of acceleration.) The periods of pulsars make them very useful tools for astronomers. Observations of a pulsar in a binary neutron star system were used to indirectly confirm the existence of gravitational radiation. The first extrasolar planets were discovered aroun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astronomical Surveys
An astronomical survey is a general map or image of a region of the sky (or of the whole sky) that lacks a specific observational target. Alternatively, an astronomical survey may comprise a set of images, spectra, or other observations of objects that share a common type or feature. Surveys are often restricted to one band of the electromagnetic spectrum due to instrumental limitations, although multiwavelength surveys can be made by using multiple detectors, each sensitive to a different bandwidth. Surveys have generally been performed as part of the production of an astronomical catalog. They may also search for transient astronomical events. They often use wide-field astrographs. Scientific value Sky surveys, unlike targeted observation of a specific object, allow astronomers to catalog celestial objects and perform statistical analyses on them without complex corrections for selection effects. In some cases, an astronomer interested in a particular object will find tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Franklin & Marshall College
Franklin & Marshall College (F&M) is a private liberal arts college in Lancaster, Pennsylvania. It employs 175 full-time faculty members and has a student body of approximately 2,400 full-time students. It was founded upon the merger of Franklin College and Marshall College, in 1853. The college offers various majors and minors across 62 fields of study, across the humanities, social sciences, natural sciences, and other disciplines. The college also operates an advanced studies program in Bath, England. All of the college's 2,254 students are undergraduates, and nearly all live on campus. The college has some notable alumni, including a Pulitzer Prize winner, and is a top producer of Fulbright Fellows. Statistics Rankings and reputation In the '' U.S. News & World Report'' annual college rankings for 2022, Franklin and Marshall College tied for 42nd in National Liberal Arts Colleges, 44th in Best Undergraduate Teaching, 98th in Top Performers on Social Mobility, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Wisconsin–Milwaukee
The University of Wisconsin–Milwaukee (UW–Milwaukee, UWM, or Milwaukee) is a public urban research university in Milwaukee, Wisconsin. It is the largest university in the Milwaukee metropolitan area and a member of the University of Wisconsin System. It is also one of the two doctoral degree-granting public universities and the second largest university in Wisconsin. The university consists of 14 schools and colleges, including the only graduate school of freshwater science in the U.S., the first CEPH accredited dedicated school of public health in Wisconsin, and the state's only school of architecture. As of the 2015–2016 school year, the University of Wisconsin–Milwaukee had an enrollment of 27,156, with 1,604 faculty members, offering 191 degree programs, including 94 bachelor's, 64 master's and 33 doctorate degrees. The university is classified among "R1: Doctoral Universities – Highest research activity". In 2018, the university had a research expenditure of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Texas At Brownsville
, mottoeng = Cultivated mind is the guardian genius of democracy. , established = , closed = (merged with UT–Pan American to form The UTRGV) , type = Public State University , president = William Fannin , endowment = US$12.5 million , provost = Alan F. J. Artibise , city = Brownsville, Texas , country = U.S. , students = 8,612 (fall 2013) , faculty = 279 (=fall 2013) , administrative_staff = 1,326 , campus = Urban, , athletics_affiliations = Red River Athletic ConferenceNational Association of Intercollegiate Athletics , former_names = , sports_nickname = Ocelots , mascot = Ozzie the Ocelot , colors = , parent = UT System , logo = UTBrownsville wordmark.png , website = , free = ''UT ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CLUMEQ
CLUMEQ (Consortium Laval-UQAM-McGill and Eastern Quebec) was a Supercomputer based in McGill University founded in 2001 and has received two successive grants from the Canada Foundation for innovation. In 2011 CLUMEQ and its partner organization RQCHP were consolidated into a new consortiuCalcul Quebéchttps://www.calculquebec.ca/a-propos/historique/ (french) Computers Past Beowulf Cluster *256 CPUs *AMD Athlon 1900+ *1.6 GHz and 1.5 GB RAM / CPU *Myrinet-2000 Switch *366 GB RAID-5 storage SGI Origin 3800 *Sixty-four 600 MHz MIPS R14000 microprocessors *128 GB RAM *1.6 TB storage Colosse * 960 Sun Blade X6275 nodes (7680 cores total) * 23 TB RAM * Infiniband QDR network * 1000 TB storage Krylov * 48 Sun Fire X4100 nodes (300 cores total) * 384 GB RAM * 15 TB storage Guillimin * 1200 compute nodes * 2 Intel Xeon 5650 hexa-core CPUs per node = 14400 cores @ 2.66 GHz * 46 TB RAM * Infiniband InfiniBand (IB) is a computer networking communications standard use ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frequency Domain
In physics, electronics, control systems engineering, and statistics, the frequency domain refers to the analysis of mathematical functions or signals with respect to frequency, rather than time. Put simply, a time-domain graph shows how a signal changes over time, whereas a frequency-domain graph shows how much of the signal lies within each given frequency band over a range of frequencies. A frequency-domain representation can also include information on the phase shift that must be applied to each sinusoid in order to be able to recombine the frequency components to recover the original time signal. A given function or signal can be converted between the time and frequency domains with a pair of mathematical operators called transforms. An example is the Fourier transform, which converts a time function into a complex valued sum or integral of sine waves of different frequencies, with amplitudes and phases, each of which represents a frequency component. The "spectrum" of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pulsars DMscale PALFA
A pulsar (from ''pulsating radio source'') is a highly magnetized rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles. This radiation can be observed only when a beam of emission is pointing toward Earth (similar to the way a lighthouse can be seen only when the light is pointed in the direction of an observer), and is responsible for the pulsed appearance of emission. Neutron stars are very dense and have short, regular rotational periods. This produces a very precise interval between pulses that ranges from milliseconds to seconds for an individual pulsar. Pulsars are one of the candidates for the source of ultra-high-energy cosmic rays. (See also centrifugal mechanism of acceleration.) The periods of pulsars make them very useful tools for astronomers. Observations of a pulsar in a binary neutron star system were used to indirectly confirm the existence of gravitational radiation. The first extrasolar planets were discovered aroun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cornell University
Cornell University is a private statutory land-grant research university based in Ithaca, New York. It is a member of the Ivy League. Founded in 1865 by Ezra Cornell and Andrew Dickson White, Cornell was founded with the intention to teach and make contributions in all fields of knowledge—from the classics to the sciences, and from the theoretical to the applied. These ideals, unconventional for the time, are captured in Cornell's founding principle, a popular 1868 quotation from founder Ezra Cornell: "I would found an institution where any person can find instruction in any study." Cornell is ranked among the top global universities. The university is organized into seven undergraduate colleges and seven graduate divisions at its main Ithaca campus, with each college and division defining its specific admission standards and academic programs in near autonomy. The university also administers three satellite campuses, two in New York City and one in Education City, Qatar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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