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The Moon's mean radius is, as it is for planetary objects like the Earth, determined as the average distance from the physical center to the surface. The value, symbolized rmoon, is equal to approximately 1,738,000 meters (1.738 x 106 m). This is roughly 1,738 kilometers (km) or 1,080 statute miles.
The Moon is not a perfect sphere; its shape is slightly distorted because of tidal effects caused by the gravitation of the Earth. In addition, there are irregularities in the surface because of craters and mountains. The actual lunar radius varies slightly depending on the direction in which it is measured. The mean... More... |
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Roy Schulte on the BPM drive and SOA adoption
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Definitions
Forensic, in a general sense, means "related to or used in courts of law" or "used for formal public debate or discussion."" The word is used in several ways in information technology, including:
network forensics: the capture, recording, and analysis of network events in order to discover the source of security attacks or other problem incidents.
computer forensics: (also called cyberforensics) the application of computer investigation and analysis techniques to gather evidence suitable for presentation in a court of law
forensic animation: the use of full-motion computer graphics to recreate an event such as an automobile accident, the collapse of a building, an assault, or the workings of a mechanical device from a variety of perspectives
forensic watermark: (also called a digital watermark) a sequence of characters or code embedded in a digital document, image, video or computer program to uniquely identify its originator and authorized user.
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Aug 31, 2007
White space, in a communications context, refers to underutilized portions of the radio frequency (RF) spectrum. Large portions of the spectrum are currently unused, in particular the frequencies allocated for analog television and those used as buffers to prevent interference between channels. In the United States, frequency allocations in the RF spectrum are made by the Federal Communications Commission (FCC). In November 2008, the FCC voted unanimously to make unlicensed portions of the spectrum available for use. At that time, at least three-quarters of the spectrum allocated for analog television was unused. These frequencies will become available once the changeover to digital television is complete in February 2009. White space allocation is expected to stimulate development of wireless technologies and services. According to Google co-founder Larry Page, white space operation will be like "Wi-Fi on steroids," because the signals in that portion of the spectrum have much longer ranges than those currently used for Wi-Fi. The increase in range means that fewer base stations will be required to give better coverage; that increased efficiency, in turn, should yield better service at lower costs. Signals in the white space range can also penetrate through solid objects better, which should yield more reliable service. Opponents of white space allocation have argued that it could lead to unexpected instances of disruptive and potentially dangerous interference between different services using the same frequencies at the same time. The FCC is testing white space devices designed to operate in the newly available frequencies to ensure that they will not cause interference. According to the FCC, wireless microphones and other low-power auxiliary stations will be able to continue to operate in bands below 700MHz.
Learn More About IT: Opponents of white space allocation have argued that it could lead to unexpected instances of disruptive and potentially dangerous interference between different services using the same frequenc More... May 22, 2006
An astronomical unit (AU) is the mean distance between the center of the Earth and the center of the sun. The actual distance varies depending on the time of year, because the Earth's orbit around the sun is not a perfect circle. The mean, or average, separation is approximately 1.4959787 x 1011 meters, which is 1.4959787 x 108 kilometers or 9.2955807 x 107 miles.
Distances within the solar system are commonly measured in AU. Mercury, the innermost planet, orbits at a mean distance of about 0.4 AU from the sun, while Neptune, one of the most distant planets known, has an average orbital radius of about 30 AU. Interstellar and intergalactic distances are expressed in light-years or parsecs. Interestingly, the Earth is closest to the Sun during the month of January, and farthest during July. The variation is about ±1 percent of the mean distance. Seasonal weather results from the tilt of the Earth's axis, and is not significantly affected by the distance of the planet from the sun. Also see the Table of Physical Units and Constants.distance between the center of the Earth and the center of the sun. The actual distance varies depending on the time of year, because the Earth's orbit around the sun is not a perfect circle. The mean, or average, separation is approximately 1.4959787 x 1011 meters, which is 1.4959787 x 108 kilometers or 9.2955807 x 107 miles. Distances within the solar system are commonly measured in AU. Mercury, the innermost planet, orbits at a mean distance of about 0.4 AU from the sun, while Neptune, one of the most distant planets known, has an average orbital radius of about 30 AU. Interstellar and intergalactic distances are expressed in light-years or parsecs. Interestingly, the Earth is closest to the Sun during the month of January, and farthest during July. The variation is about ±1 percent of the mean distance. Seasonal weather results from the tilt of the Earth's axis, and is not significantly affected by the distance of the planet from the sun. Also see the More... Sep 6, 2002
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