Anti-gravity - Revision history

en>Fireball24fire: /* See also */

2014-03-02T18:17:08Z

See also

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	~~{{Unreferenced\|date=December 2009}}~~		Greetings. The author's name is Isobel but she never really liked that name. He's always loved living in New Mexico. As a girl what I like is playing dominoes but i don't offer the time currently. Invoicing already been my employment for a little while but I've always wanted my own business. I'm no real at webdesign but stores want to be sure of my website: http://www.43things.com/entries/view/6515440<br><br>Feel free to surf to my web blog :: epoxi resina - [http://www.43things.com/entries/view/6515440 made a post],
	The ~~term '''center''' or '''centre''~~' is ~~used in various contexts in [[abstract algebra]] to denote the set of all those elements~~ that ~~[[commutative operation\|commute]] with all other elements~~. ~~It is often denoted~~ '~~'Z,'' from German ''[[wikt:Zentrum\|Zentrum]],'' meaning "center"~~. ~~More specifically:~~
	* The '''[[center of a ~~group]]''' ''G'' consists of all those elements ''x'' in ''G'' such that ''xg'' = ''gx'' for all ''g'' in ''G''. This~~ is ~~a [[normal subgroup]] of ''G'~~'.
	* The center of a [[ring (mathematics)\|ring]] ''R'' is the subset of ''R'' consisting of all those elements ''x'' of ''R'' such that ''xr'' = ''rx'' for ~~all ''r'' in ''R''. The center is~~ a ~~[[commutative ring\|commutative]] [[subring]] of~~ '~~'R'', and ''R'' is an [[algebra (ring theory)\|algebra]] over its center~~.
	* The center of an [[algebra over a field\|algebra]] '~~'A'' consists~~ of ~~all those elements ''x'' of ''A'' such that ''xa'' = ''ax'' for all ''a'' in ''A''. See also~~: ~~[[central simple algebra]].~~
	* The center of a [[Lie algebra]] ''L'' consists of all those elements ''x'' in ''L'' such that [''x'',''a''] = 0 for all ''a'' in ''L''. ~~This is an [[ideal (ring theory)\|ideal]] of the Lie algebra ''L''~~.
	* The [[centre (category)\|center]] of a [[monoidal category]] '''C''' consists of pairs ''(A,u)'' where ''A'' is an object of '''C''', and <~~math~~>u:~~A \otimes~~ - ~~\rightarrow - \otimes A<~~/~~math>~~ a ~~natural isomorphism satisfying certain axioms.~~

	~~== See also ==~~
	*[[Centralizer and normalizer]]

	~~== References ==~~
	~~Modern Algebra~~, ~~R. Durbin, 3rd edition (1992), page 118, exercise 22.22~~

	~~{{DEFAULTSORT:Center (Algebra)}}~~
	~~[[Category:Abstract algebra]]~~

en>Aldebaran66: Reverted 1 edit by Manuelfeliz (talk): Rm self-promotion and WP:OR (again). (TW)

2014-02-01T02:40:12Z

Reverted 1 edit by Manuelfeliz (talk): Rm self-promotion and WP:OR (again). (TW)

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	~~Wikipedia defines epoxy resins as "Epoxy~~ is ~~a copolymer;~~ that is, ~~it is formed~~ from ~~two different chemicals. These are referred to as "resin" or~~ "~~compound~~" ~~and the "hardener" or "activator~~." The ~~resin consists~~ of ~~monomers or short chain polymers with an epoxide~~ group ~~at either end." One~~ of ~~the first attempts to make resins from the compound Epicholorohydrin was made~~ in ~~the 1920~~'s in ~~the United States~~. ~~These resins today are~~ a ~~multi billion industry in the United States and have a variety~~ of ~~uses that can either be commercial and industrial~~.~~<br><br>In~~ the ~~section below, we have discussed some~~ of ~~the applications and versatile uses~~ of ~~epoxy resins-<br><br>~~The ~~adhesive industry uses epoxy based resins for the process~~ of ~~curing~~, ~~which alters the chemical properties~~. ~~These properties make these resins appropriate~~ for ~~coating and adhesive purposes~~. ~~If you treasured this article therefore you would like to obtain more info relating to~~ [~~http://vazquezn1.wordpress.com/2014/06/17/la-fibra-de-vidrio-un-elemento-preciado-con-considerable-potencial-en-el-reciclaje/ epoxi resina~~] ~~nicely visit our own web-site~~. ~~These resins form~~ a ~~thin protective layer around the object offering it excellent hardness. Used in industrial and automobile industry, they help to provide effective results in case~~ of ~~corrosion and its prevention.<br><br>Their residential applications may include its uses as paints or for color protectors. These resins have their uses~~ in ~~repairing things~~ that ~~are made of porcelain~~, ~~things made of wood or leather, metal and glass.<br><br>When it comes to industrial uses, these resins have~~ a ~~wide usage in the cosmetic dentistry industry, communication industry in the form of fibre optics and optoelectronics. The electronics industry uses these resins widely~~ for ~~making insulators, and electricity conductors.<br><br>In electrical systems and electronics industry, these resins find its uses~~ in ~~motors, bushing, and insulators~~. ~~Protection~~ is ~~provided to electrical components from external factors as dust or short-circuiting with~~ the ~~help~~ of ~~these resins.<br><br>One~~ of ~~biggest areas~~ where ~~these resins have their applications~~ is ~~in the marine industry. There are some important reasons due to which they are used in the marine industry. One~~ of ~~these reasons is the better mechanical properties as compared to the polyester resins that for it to be employed widely in the production of marine components. The other reason is their strength~~, ~~property to fill gaps~~ and ~~adhesion.~~<br><br>~~Epoxy resins~~ also ~~have applications in the aerospace industries where they are mixed with fibre in order to construct structural matrix material~~.~~<br><br>Finally~~, ~~these highly utilized resins are also used in biology for the sectioning of the samples which are later imaged using an electron microscope~~.		{{Unreferenced\|date=December 2009}}
			The term '''center''' or '''centre''' is used in various contexts in [[abstract algebra]] to denote the set of all those elements that [[commutative operation\|commute]] with all other elements. It is often denoted ''Z,'' from German ''[[wikt:Zentrum\|Zentrum]],'' meaning "center". More specifically:
			* The '''[[center of a group]]''' ''G'' consists of all those elements ''x'' in ''G'' such that ''xg'' = ''gx'' for all ''g'' in ''G''. This is a [[normal subgroup]] of ''G''.
			* The center of a [[ring (mathematics)\|ring]] ''R'' is the subset of ''R'' consisting of all those elements ''x'' of ''R'' such that ''xr'' = ''rx'' for all ''r'' in ''R''. The center is a [[commutative ring\|commutative]] [[subring]] of ''R'', and ''R'' is an [[algebra (ring theory)\|algebra]] over its center.
			* The center of an [[algebra over a field\|algebra]] ''A'' consists of all those elements ''x'' of ''A'' such that ''xa'' = ''ax'' for all ''a'' in ''A''. See also: [[central simple algebra]].
			* The center of a [[Lie algebra]] ''L'' consists of all those elements ''x'' in ''L'' such that [''x'',''a''] = 0 for all ''a'' in ''L''. This is an [[ideal (ring theory)\|ideal]] of the Lie algebra ''L''.
			* The [[centre (category)\|center]] of a [[monoidal category]] '''C''' consists of pairs ''(A,u)'' where ''A'' is an object of '''C''', and <math>u:A \otimes - \rightarrow - \otimes A</math> a natural isomorphism satisfying certain axioms.

			== See also ==
			*[[Centralizer and normalizer]]

			== References ==
			Modern Algebra, R. Durbin, 3rd edition (1992), page 118, exercise 22.22

			{{DEFAULTSORT:Center (Algebra)}}
			[[Category:Abstract algebra]]

en>DVdm: /* Gyroscopic devices */ gsjournal.net is not a wp:reliable source - anyone can put anything there

2012-08-18T10:29:09Z

Gyroscopic devices: gsjournal.net is not a wp:reliable source - anyone can put anything there

New page

Wikipedia defines epoxy resins as "Epoxy is a copolymer; that is, it is formed from two different chemicals. These are referred to as "resin" or "compound" and the "hardener" or "activator." The resin consists of monomers or short chain polymers with an epoxide group at either end." One of the first attempts to make resins from the compound Epicholorohydrin was made in the 1920's in the United States. These resins today are a multi billion industry in the United States and have a variety of uses that can either be commercial and industrial. In the section below, we have discussed some of the applications and versatile uses of epoxy resins- The adhesive industry uses epoxy based resins for the process of curing, which alters the chemical properties. These properties make these resins appropriate for coating and adhesive purposes. If you treasured this article therefore you would like to obtain more info relating to [http://vazquezn1.wordpress.com/2014/06/17/la-fibra-de-vidrio-un-elemento-preciado-con-considerable-potencial-en-el-reciclaje/ epoxi resina] nicely visit our own web-site. These resins form a thin protective layer around the object offering it excellent hardness. Used in industrial and automobile industry, they help to provide effective results in case of corrosion and its prevention. Their residential applications may include its uses as paints or for color protectors. These resins have their uses in repairing things that are made of porcelain, things made of wood or leather, metal and glass. When it comes to industrial uses, these resins have a wide usage in the cosmetic dentistry industry, communication industry in the form of fibre optics and optoelectronics. The electronics industry uses these resins widely for making insulators, and electricity conductors. In electrical systems and electronics industry, these resins find its uses in motors, bushing, and insulators. Protection is provided to electrical components from external factors as dust or short-circuiting with the help of these resins. One of biggest areas where these resins have their applications is in the marine industry. There are some important reasons due to which they are used in the marine industry. One of these reasons is the better mechanical properties as compared to the polyester resins that for it to be employed widely in the production of marine components. The other reason is their strength, property to fill gaps and adhesion. Epoxy resins also have applications in the aerospace industries where they are mixed with fibre in order to construct structural matrix material. Finally, these highly utilized resins are also used in biology for the sectioning of the samples which are later imaged using an electron microscope.