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Research And Development Array
The Research and Development Array (RDA) is a research and development effort related to the Pierre Auger Observatory. It consists of a set of water tanks and communication towers near Lamar, CO. Goals The goals are to study potential upgrades to the existing Auger South ultra-high-energy cosmic ray observatory as well as develop technology for the proposed Auger NorthAuger North Proposal presented to the Physics Advisory Council at Fermilab in November 2009 (Fermilab proposal 997) observatory. The RDA investigates modifications to the Pierre Auger Observatory surface detectors (SD) and to the communications system by which the SDs transmit their data to the central data acquisition. Overview The RDA is located in an area of several square miles just South of the city of Lamar, Colorado, in the United States, part of the area proposed for Auger North. It consists of surface detectors (water tanks instrumented with photomultiplier tubes and readout electronics), communication ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pierre Auger Observatory
The Pierre Auger Observatory is an international cosmic ray observatory in Argentina designed to detect ultra-high-energy cosmic rays: sub-atomic particles traveling nearly at the speed of light and each with energies beyond 1018 eV. In Earth's atmosphere such particles interact with air nuclei and produce various other particles. These effect particles (called an " air shower") can be detected and measured. But since these high energy particles have an estimated arrival rate of just 1 per km2 per century, the Auger Observatory has created a detection area of —the size of Rhode Island, or Luxembourg—in order to record a large number of these events. It is located in the western Mendoza Province, Argentina, near the Andes. Construction began in 2000, the observatory has been taking production-grade data since 2005 and was officially completed in 2008. The northern site was to be located in southeastern Colorado, United States and hosted by Lamar Community C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lamar, Colorado
Lamar is the home rule municipality that is the county seat and the most populous municipality of Prowers County, Colorado, United States. The city population was 7,804 at the 2010 United States Census. The city was named after Confederate slaveholder Lucius Quintus Cincinnatus Lamar II during the period that he was Secretary of the Interior in the futile hope that the town would be named as the land office. History Lamar was founded on May 24, 1886 by Issac Holmes. It was named after Lucius Lamar. At the time Lamar was the Secretary of the Interior, but previously he had written the Mississippi Ordinance of Secession, served the Confederacy as an officer and a diplomat. The first town elections were held in December, and C. M. Morrison became the town's first mayor. In 1889 Prowers County was established, and Lamar was elected to house the county's government. Throughout its history, Lamar has suffered from fires and floods. The town was also greatly affected by the Dust ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ultra-high-energy Cosmic Ray
In astroparticle physics, an ultra-high-energy cosmic ray (UHECR) is a cosmic ray with an energy greater than 1 EeV (1018 electronvolts, approximately 0.16 joules), far beyond both the rest mass and energies typical of other cosmic ray particles. An extreme-energy cosmic ray (EECR) is an UHECR with energy exceeding (about 8 joule, or the energy of a proton traveling at ≈ % the speed of light), the so-called Greisen–Zatsepin–Kuzmin limit (GZK limit). This limit should be the maximum energy of cosmic ray protons that have traveled long distances (about 160 million light years), since higher-energy protons would have lost energy over that distance due to scattering from photons in the cosmic microwave background (CMB). It follows that EECR could not be survivors from the early universe, but are cosmologically "young", emitted somewhere in the Local Supercluster by some unknown physical process. If an EECR is not a proton, but a nucleus with ''A'' nucleons, then ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bandwidth (computing)
In computing, bandwidth is the maximum rate of data transfer across a given path. Bandwidth may be characterized as network bandwidth, data bandwidth, or digital bandwidth. This definition of ''bandwidth'' is in contrast to the field of signal processing, wireless communications, modem data transmission, digital communications, and electronics, in which ''bandwidth'' is used to refer to analog signal bandwidth measured in hertz, meaning the frequency range between lowest and highest attainable frequency while meeting a well-defined impairment level in signal power. The actual bit rate that can be achieved depends not only on the signal bandwidth but also on the noise on the channel. Network capacity The term ''bandwidth'' sometimes defines the net bit rate 'peak bit rate', 'information rate,' or physical layer 'useful bit rate', channel capacity, or the maximum throughput of a logical or physical communication path in a digital communication system. For example, bandwidth test ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
