en>YohanN7: /* Intrinsic expectation */ changed link due to split of target

2014-12-06T13:35:50Z

Intrinsic expectation: changed link due to split of target

en>Monkbot: Fix CS1 deprecated date parameter errors

2014-01-18T05:52:23Z

Fix CS1 deprecated date parameter errors

← Older revision		Revision as of 07:52, 18 January 2014
Line 1:		Line 1:
	~~Making a computer run rapidly is pretty easy. Most computers run slow considering they are jammed up with junk files~~, ~~which Windows has to look through every time it wants to obtain something. Imagine having to find a book inside a library~~, ~~but all~~ of the ~~library books are in a big huge pile~~. ~~That~~'s ~~what it~~'s ~~like for your computer~~ to ~~locate something, whenever a system~~ is ~~full~~ of ~~junk files~~.~~<br><br>If it is not~~ as ~~big~~ of ~~a problem because you think~~ it's, ~~it could probably be solved conveniently by running a Startup Repair~~ or ~~by System Restore Utility~~. ~~Again it~~ can be as ~~easy because running an anti~~-~~virus check or cleaning the registry.~~<br><br>~~Perfect Optimizer also offers to remove junk files plus~~ is ~~completely Windows Vista compatible~~. ~~Many registry product merely don't have the time and income to analysis Windows Vista mistakes~~. ~~Because perfect optimizer has a large customer base, they do have~~ the ~~time~~, ~~money and factors to support totally support Windows Vista.~~<br><br>~~Review~~ the ~~files and clean it up regularly~~. ~~Destroy all unwanted plus unused files because they just jam a computer system~~. ~~It usually surely enhance~~ the ~~speed~~ of the ~~computer plus be careful that~~ the ~~computer never afflicted by a virus. Remember constantly~~ to ~~update your antivirus software each time. If you never employ your computer fairly frequently~~, ~~you are able to take a free antivirus.~~<br><br>~~After which, I also purchased~~ the ~~Regtool [http://bestregistrycleanerfix~~.~~com~~/~~tune-up~~-~~utilities tuneup utilities] Software, plus it further protected my laptop having program crashes. All my registry issues are fixed~~, ~~plus I could work peacefully.~~<br><br>~~Although I usually utilize the many recent variation of browser~~, sometimes different extensions plus plugins become the cause of mistakes with my browser plus the program. The same is the story with my browser that was crashing frequently perhaps due to the Flash player error.<br><br>~~The~~ '~~registry~~' ~~is simply the central database which shops all your settings plus choices. It~~'~~s a truly significant piece~~ of the ~~XP program, which means which Windows is constantly adding and updating the files inside it~~. ~~The difficulties occur when Windows really corrupts & loses a few of these files. This makes your computer run slow~~, ~~as it attempts difficult to locate them again.~~<~~br><br~~>~~Frequently~~ the ~~best way is to read ratings on them plus if various consumers remark regarding its efficiency,~~ it is ~~actually probably to be work. The best part~~ is ~~that there are many top registry products which work; we just have to take~~ the ~~pick~~.		{{Unreferenced\|date=October 2008}}
			The '''argument of periapsis''' (also called '''argument of perifocus''' or '''argument of pericenter'''), symbolized as ''ω'', is one of the [[orbital element]]s of an [[orbit]]ing body. Specifically, ''ω'' is the angle between the orbit's [[apsis\|periapsis]] (the point of closest approach to the central point) and the orbit's [[ascending node]] (the point where the body crosses the [[plane of reference]] from South to North). The angle is measured in the [[orbital plane (astronomy)\|orbital plane]] and in the direction of motion. For specific types of orbits, words such as "perihelion" (for [[Sun]]-centered orbits), "perigee" (for [[Earth]]-centered orbits), "periastron" (for orbits around stars) and so on may replace the word "periapsis". See [[apsis]] for more information.

			{{Confusing\|section\|date=January 2012}}
			An argument of periapsis of 0° means that the orbiting body will be at its closest approach to the central body at the same moment that it crosses the plane of reference from South to North. An argument of periapsis of 90° means that the orbiting body will reach periapsis at its northmost distance from the plane of reference.

			Adding the argument of periapsis to the [[longitude of the ascending node]] gives the [[longitude of the periapsis]]. However, especially in discussions of binary stars and exoplanets, the terms "longitude of periapsis" or "longitude of periastron" are often used synonymously with "argument of periapsis".

			[[Image:Orbit1.svg\|thumb\|right\|500px\|Fig. 1: Diagram of orbital elements, including the argument of periapsis (''ω'').]]

			== Calculation==
			In [[astrodynamics]] the '''argument of periapsis''' ''ω'' can be calculated as follows:

			:<math> \omega = \arccos { {\mathbf{n} \cdot \mathbf{e}} \over { \mathbf{\left \|n \right \|} \mathbf{\left \|e \right \|} }}</math>

			:(if <math>e_z < 0\,</math> then <math>\omega = 2 \pi - \omega\,</math>)

			where:
			* <math> \mathbf{n} </math> is a vector pointing towards the ascending node (i.e. the ''z''-component of <math> \mathbf{n} </math> is zero),
			* <math> \mathbf{e } </math> is the [[eccentricity vector]] (a vector pointing towards the periapsis).

			In the case of [[equatorial orbit]]s (which have no ascending node), the argument is strictly undefined. However, if the convention of setting the longitude of the ascending node ''Ω'' to 0 is followed, then the value of ''ω'' follows from the two-dimensional case:

			:<math> \omega = \arctan2({e_y}, {e_x})</math>

			:(if the orbit is clockwise (i.e. <math> ( \mathbf{r} \times \mathbf{v} )_z < 0</math>) then <math>\omega = 2 \pi - \omega\,</math>)

			where:

			*<math> e_x\,</math> and <math> e_y\,</math> are the ''x'' and ''y'' components of the eccentricity vector <math> \mathbf{e }.\,</math>

			In the case of circular orbits it is often assumed that the periapsis is placed at the ascending node and therefore ''ω''=0.

			==See also==
			*[[Kepler orbit]]s
			*[[Orbital node]]
			*[[Orbital mechanics]]

			==References==
			{{reflist}}

			==External links==

			{{orbits}}

			[[Category:Orbits]]

			[[ru:Кеплеровы элементы орбиты#Аргумент перицентра]]

en>Prax54 at 03:08, 14 August 2012

2012-08-14T03:08:01Z

New page

Making a computer run rapidly is pretty easy. Most computers run slow considering they are jammed up with junk files, which Windows has to look through every time it wants to obtain something. Imagine having to find a book inside a library, but all of the library books are in a big huge pile. That's what it's like for your computer to locate something, whenever a system is full of junk files. If it is not as big of a problem because you think it's, it could probably be solved conveniently by running a Startup Repair or by System Restore Utility. Again it can be as easy because running an anti-virus check or cleaning the registry. Perfect Optimizer also offers to remove junk files plus is completely Windows Vista compatible. Many registry product merely don't have the time and income to analysis Windows Vista mistakes. Because perfect optimizer has a large customer base, they do have the time, money and factors to support totally support Windows Vista. Review the files and clean it up regularly. Destroy all unwanted plus unused files because they just jam a computer system. It usually surely enhance the speed of the computer plus be careful that the computer never afflicted by a virus. Remember constantly to update your antivirus software each time. If you never employ your computer fairly frequently, you are able to take a free antivirus. After which, I also purchased the Regtool [http://bestregistrycleanerfix.com/tune-up-utilities tuneup utilities] Software, plus it further protected my laptop having program crashes. All my registry issues are fixed, plus I could work peacefully. Although I usually utilize the many recent variation of browser, sometimes different extensions plus plugins become the cause of mistakes with my browser plus the program. The same is the story with my browser that was crashing frequently perhaps due to the Flash player error. The 'registry' is simply the central database which shops all your settings plus choices. It's a truly significant piece of the XP program, which means which Windows is constantly adding and updating the files inside it. The difficulties occur when Windows really corrupts & loses a few of these files. This makes your computer run slow, as it attempts difficult to locate them again. Frequently the best way is to read ratings on them plus if various consumers remark regarding its efficiency, it is actually probably to be work. The best part is that there are many top registry products which work; we just have to take the pick.

Estimation of covariance matrices - Revision history

en>YohanN7: /* Intrinsic expectation */ changed link due to split of target

en>Monkbot: Fix CS1 deprecated date parameter errors

en>Prax54 at 03:08, 14 August 2012