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Topic: Effective Earth radius

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	Rodents in Poultry Houses
		The drawbacks to red squill, compared to zinc phosphide, are that it is effective only against the Norway rat, is generally less acceptable by all rats, has poor reacceptance after sublethal intake, has less overall killing effectiveness, and is not readily available for purchase.
		It is not considered effective enough for house mice or roof rats.
		They are effective against both rats and mice and, when used at the recommended level, bait shyness is not developed.
	www.msstate.edu /dept/poultry/rodents.htm (6139 words)

	Earth radius - Wikipedia, the free encyclopedia
		The radius of Earth (or any planet) is the distance from its centre to a point on its surface at mean sea level.
		The Earth's polar radius, or semi-minor axis, is the distance from its center to the North and South Poles, and equals 6,356.750 km (≈3,949.901 mi; ≈3,432.370 nm).
		It is this radius that would be used to approximate the ellipsoid's average great ellipse (i.e., this is the equivalent spherical "great-circle" radius of the ellipsoid).
	en.wikipedia.org /wiki/Earth_radius (373 words)

	Encyclopedia: Earth radius
		The Earth's polar radius is the distance from its center to the North or South Pole, and is approximately 6,356.750 kilometres (3,949.9 statute miles).
		The Earth's equatorial radius is the distance from its centre to the equator, and is approximately 6,378.135 kilometres (3,963.2 miles).
		See also: Effective Earth radius In telecommunication, effective Earth radius is the radius of a hypothetical Earth for which the distance to the radio horizon, assuming rectilinear propagation, is the same as that for the actual Earth with an assumed uniform vertical gradient of atmospheric refractive index.
	www.nationmaster.com /encyclopedia/Earth-radius (585 words)

	radius
		The radius (plural radii, pronounced ray-dee-eye) of a circle or sphere is the distance from its center to the edge or periphery.
		The radius is the bone of the forearm that extends from the inside of the elbow to the thumb side of the wrist.
		The radius is situated on the lateral side of the ulna, which exceeds it in length and size.
	www.fact-library.com /radius.html (1372 words)

	Earth radius (Site not responding. Last check: 2007-10-10)
		The radius of the Earth is the distance fromthe Earth's centre to its surface at mean sea level.
		The Earth is not aperfect sphere, but instead is somewhat flattened at the North and South Poles, and it bulges at the equator.
		The Earth's equatorial radius is the distance from its centre to the equator, and is approximately 3963 miles (6378.5kilometres).
	www.therfcc.org /earth-radius-31170.html (187 words)

	Earth Radius Encyclopedia Article, Definition, History, Biography (Site not responding. Last check: 2007-10-10)
		The Earth's polar radius is the distance from its center to the North or South Pole, and is approximately 6,356.750 kilometres (3,949.901 statute miles).
		The Earth's equatorial radius is the distance from its centre to the equator, and is approximately 6,378.135 kilometres (3,963.189 miles).
		The Earth's authalic ("equal area") mean radius is approximately 6,371.005 kilometres (3,958.759 statute miles; 3,440.067 nautical miles).
	www.karr.net /encyclopedia/Earth_radius (437 words)

	EFFECTIVE EARTH'S RADIUS (Site not responding. Last check: 2007-10-10)
		The radius of an ideal spherical Earth without atmosphere for which propagation paths are along straight lines, the height and ground distances being the same as for the actual Earth in an atmosphere with a constant vertical gradient of refractivity.
		virkelig jordradius (actual radius of the earth, effective radius of the Earth, real radius of the earth, true earth radius), sand jordradius (actual radius of the earth, effective radius of the Earth, real radius of the earth, true earth radius).
		rayon terrestre réel (effective radius of the Earth), rayon réel de la terre (effective radius of the Earth).
	www.websters-online-dictionary.org /ef/effective+Earth%2527s+radius.html (451 words)

	Aerospace Science and Technology Dictionary E Page
		A fictitious value for the radius of the earth, used in place of the geometrical radius to correct for atmospheric refraction when the index of refraction in the atmosphere changes linearly with height.
		The wavelength corresponding to the effective propagation velocity.
		The terrestrial equator is 90° from the earth's geographical poles; the celestial equator or equinoctial is 90 ° from the celestial poles; the galactic equator or galactic circle is 90° from the galactic poles.
	www.hq.nasa.gov /office/hqlibrary/aerospacedictionary/508/e.html (10023 words)

	Effective Studying (Site not responding. Last check: 2007-10-10)
		Antenna effective area 1: In telecommunication, '''antenna effective area''' is the functionally equivalent area from 3: ''Note 1:'' Antenna effective area is usually expressed in square meters.
		Effective data transfer rate 1: In telecommunication, '''effective data transfer rate''' is the average number of un 3: ts, characters, blocks, or frames per second.
		Effective Earth radius 1: In telecommunication, '''effective Earth radius''' is the radius of a hypothetical [ 3: i>Note: For the standard atmosphere, the effective Earth radius is 4/3 that of the actual Earth ra 8: Category:EarthRadius, effective
	www.lottery-news.net /dust14446-effective_studying.html (463 words)

	AMS Glossary
		The effective earth radius is a convenient fiction that makes straight the actual curved path of a radio ray in the atmosphere by presenting it relative to an imaginary earth with a radius larger than the radius of the real earth, thus maintaining the relative curvature between earth and radio ray.
		where R is the radius of the earth and dn/dz is the refractive index gradient of its atmosphere.
		The radius of curvature of the propagating rays depends on the vertical gradient of the refractive index.
	amsglossary.allenpress.com /glossary/search?id=effective-earth-radius1 (208 words)

	Earth radius
		Earth radii are sometimes used to measure distance.
		The radius of Earth is ~ 6,378 km.
		The text of this article is licensed under the GFDL.
	www.ebroadcast.com.au /lookup/encyclopedia/ea/Earth_radius.html (36 words)

	Read about Earth radius at WorldVillage Encyclopedia. Research Earth radius and learn about Earth radius here! (Site not responding. Last check: 2007-10-10)
		The radius of the Earth is the distance from the Earth's centre to its surface at
		The Earth is not a perfect sphere, but instead is somewhat flattened at the
		The Earth's polar radius is the distance from its center to the North or South Pole, and is approximately 6,356.9
	encyclopedia.worldvillage.com /s/b/Earth_radius (243 words)

	Wireless Units... The leader In Refurbished Wireless Equipment - Calculators
		However the ATIS Committe T1A1 recommends use of the effective earth radius (4/3 * earth radius).
		Previous calculations used the earth's radius and were higher by ~30%.
		The calculator will generate the radius of the 1st Fresnel zone only (at the obstable point or the mid-point), the 60% (no obstacle) radius and the height of the effective earth curvature at the mid-point of the Total link distance using the effective earth radius.
	www.wirelessunits.com /index.php?action=page_display&PageID=34 (0 words)

	Earth radius Information (Site not responding. Last check: 2007-10-10)
		Earth Radius are great for when you're looking to get better at earth radius for selfish purposes.
		If you need help locating earth radius then you've come to the right place because we have all the earth radius you could want.
		...effective Earth radius effective Earth radius: The radius of a hypothetical Earth for which the distance to the radio horizon, assuming...
	earth.1infochest.info /flat-earth/earth-radius.html (238 words)

	NASA's Cosmicopia -- Ask Us -- Earth and Moon
		The Earth is not a perfect sphere, so the distance to the center of the Earth varies from 6378 km (3963 miles) at the equator to 6357 km (3950 miles) at the poles.
		Since the Earth is revolving around the Sun, it actually has to rotate almost one degree (360 degrees/365.25 days) further until the Sun is in the same place in the sky, which is the definition of a day that everyone is used to.
		From The Nine Planets, the diameter of the Earth is 12,756 km, and the diameter of the Moon is 3,476 km.
	helios.gsfc.nasa.gov /qa_earth.html (10674 words)

	Welcome to IEEE Xplore 2.0: Effective earth radius for refraction of radio waves at altitudes above 1 km (Site not responding. Last check: 2007-10-10)
		For propagation paths within 1 km of the earth's surface, the effective earth radius model is normally valid and commonly used.
		Results obtained from the ray trace model are employed to show that the effective earth radius method (EERM) can be used for approximate determinations of grazing angle, ground range and slant range for higher altitude paths.
		Effective earth radius scale factors are given as functions of transmitter altitude for selected values of surface refractivity.
	xplqa.ieee.org /xpls/abs_all.jsp?isnumber=25673&arnumber=1143948&count=14&index=4 (200 words)

	[No title] (Site not responding. Last check: 2007-10-10)
		That part of the atmosphere which effectively influences a particular process or motion, its outer limits varying according to the terms of the process or motion considered.
		] A radius value used in place of the geometric radius to correct for atmospheric refraction in estimating ranges of antennas when the index of refraction in the atmosphere changes linearly with height; under conditions of standard refraction it is &frac43; the geometric radius.
		Also known as effective radius of the earth.
	www.accessscience.com /Dictionary/E/E3/DictE3.html (2462 words)

	TVTechnology - RF Technology
		Both of these numbers represent the typical refractivity and effective earth curvature seen in the U.S. Although the two numbers are related, the difference is that the K factor represents the effect of the refraction on RF propagation rather than the amount of refraction.
		K factor makes it easy to plot propagation over earth as it changes the effective earth radius to represent the path a signal will take through an atmosphere, over the earth, with a certain amount of refraction.
		Note that while the graphs look similar, the scale is much different, reflecting the change in effective earth radius with the change in K factor.
	tvtech.com /features/On-RF/f-DL-signals.shtml (1603 words)

	Dictionary of Technical Terms for Aerospace Use - E (Site not responding. Last check: 2007-10-10)
		meteor trajectory intersects the surface of the earth.
		conic, the ratio of the length of the radius vector through a point on the conic to the distance of the point from the directrix.
		Escape velocity from Earth is 7 miles/sec; from Mars it is 3.2 miles/sec; and from the Sun it is 390 miles/sec.
	zaphod1.grc.nasa.gov /~dglover/dictionary/e.html (8183 words)

	Aerospace Science and Technonlogy Dictionary E Section
		Earth Resources Observation Systems Data Center (EDC) is a national archive, production, distribution, and research facility for remotely sensed data and other geographic information.
		Areas on or near the Earth's equator; regions between the Tropic of Cancer and the Tropic of Capricorn (23 degrees 27 minutes North or South of the Equator).
		Gliding flight in which the sum of the vertical components of the aerodynamic lift and centrifugal force is equal to the force of gravity.
	www.hq.nasa.gov /office/hqlibrary/aerospacedictionary/aerodictall/e.html (10437 words)

	Pathloss 4.0 - Multipath Module (Site not responding. Last check: 2007-10-10)
		A curved earth representation is used and all rays are drawn as straight lines.
		The display uses a flat earth representation and the rays are drawn as curved lines.
		An instructional display which illustrates the concept of the effective earth radius is available in the multipath module.
	www.pathloss.com /p4/multipath.html (128 words)

	USIGS Definitions and Descriptions - E
		Component of uncorrected observed gravity obtained on a moving platform that is attributed to the east-west component of the velocity that either increases or decreases the effect of the centrifugal force caused by the Earth's rotation.
		The angle at a celestial object subtended by the equatorial semidiameter of the Earth used to indicate the distance of the object from the Earth.
		The azimuth angle, and the radius of curvature in the meridian and in the prime vertical must be known.
	www.fas.org /irp/agency/nima/nug/gloss_e.html (9165 words)

	Oct 23 Venus (Site not responding. Last check: 2007-10-10)
		Venus is often called the twin planet to Earth because 1) it has a similar radius/size, 2) is has a similar mass, 3) it has a similar density and 4) it has an atmosphere.
		However, the environment of Venus is very different from the Earth.
		The effective resolution of this image is about 3 kilometers.
	zebu.uoregon.edu /disted/ph121/js11.html (429 words)

	IBC 2002 Conference Papers (Site not responding. Last check: 2007-10-10)
		The effective earth radius used in this calculation is modified according to the time percentage required for the prediction.
		In the UKPM we have used an algorithm, described by Ordnance Survey (3), that takes the earth’s curvature into account, and therefore accurately traces the correct curve that corresponds to the shortest path.
		A common use for the UKPM is for predictions where the transmitter and receiver are in different countries and therefore in different grid systems.
	www.broadcastpapers.com /tvtran/IBCNTLUKPlanningDTTVC02.htm (1547 words)

	On the Validity of the Longley-Rice (50,90/10) Propagation Model for HDTV Coverage and Interference Analysis
		A Standing Wave Ratio (SWR) of 5:1 across the UHF band is not unusual and a ratio of 2:1 is common.
		The effective noise figure, accounting for the SWR in the downlead cable, would then be closer to 13 dB than to 7 dB.
		The FCC's LR model assumes an effective earth radius of 5280 miles everywhere.
	www.dielectric.com /broadcast/longley-rice.asp (2779 words)

	E E 473 ANTENNAS AND PROPAGATION
		Radiation patterns; radiated power; antenna impedance; gain, directivity, and effective aperture; reciprocity in transmission and reception; Hertz element and half-wave dipole; effective height; Friis transmission equation; farfield approximation.
		Refraction and effective Earth radius; line-of-sight propagation conditions; Fresnel reflection coefficients and pseudo-Brewster angle; effect of ground on radiation pattern; propagation between elevated antennas over lossy earth; obstacles and first Fresnel zone clearance; ionospheric reflection at oblique incidence; Faraday rotation.
		Friis transmission equation, propagation between elevated antennas over lossy earth, Fresnel zones and the effect of obstacles, earth curvature and the effects of refraction, ionospheric reflection.
	www.ee.ualberta.ca /courses/EE473.html (254 words)

	Calculation of the Earth's Effective Temperature. (Site not responding. Last check: 2007-10-10)
		The effective temperature of a planet is the temperature it would have if it acted like a fl body, absorbing all the incoming radiation received at its surface and reradiating it all back to space.
		The Earth intercepts a small part of the total radiation that arrives in its neighborhood of the solar system (its distance from the Sun).
		Since you know the average intensity of the radiation the Earth's surface receives from the Sun (and if the Earth is a fl body it will reradiate the same amount to space), you can use the Stephan-Boltzman equation to calculate the effective temperature of the Earth.
	www.ldeo.columbia.edu /dees/ees/ies2/energy/effective_temp.html (457 words)

	Greenhouse effect
		Mars, Venus and other celestial bodies with atmospheres (such as Titan) have greenhouse effects, but for simplicity the rest of this article will refer to the case of Earth.
		The term greenhouse effect may be used to refer to two different things in common parlance: the natural greenhouse effect, which refers to the greenhouse effect which occurs naturally on earth, and the enhanced (anthropogenic) greenhouse effect, which results from human activities (see also global warming).
		The former is accepted by all; the latter is accepted by most scientists, although there is some dispute.
	www.kiwipedia.com /greenhouse-effect.html (128 words)

	Geophysics at K-State (Site not responding. Last check: 2007-10-10)
		On the practical side, geophysical exploration is the most efficient and cost-effective way to locate oil, gas, and minerals, as well as objects or substances related to the study and protection of the environment.
		Our study using seismic waves recorded by about 100 seismic stations suggests that a sedimentary lens structure buried about 4 km beneath the damaged area was responsible for the heavy damage, by focusing energy to the 2 by 2 km area.
		Introduction to the broad area of solid earth geophysics and exploration geophysics, such as plate tectonics, earthquakes, structure and dynamics of the Earth's deep interior, and geophysical exploration for natural resources.
	earth.geol.ksu.edu /geophysics/introduction.html (913 words)

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