Disjunctive sequence - Revision history

en>R.e.s.: /* Examples */ The polynomial is evaluated at 1,2,3,..., not at the primes. Also, this is not a third case of the previously cited result.

2014-05-18T18:44:14Z

Examples: The polynomial is evaluated at 1,2,3,..., not at the primes. Also, this is not a third case of the previously cited result.

← Older revision		Revision as of 20:44, 18 May 2014
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	'~~''Atkinson friction factor'''~~ is ~~a measure of the resistance to airflow of a duct~~. It is ~~widely used in the [[Underground mine ventilation\|mine ventilation]] industry but is rarely referred to outside of it~~.		The author's name is Andera and she believes it sounds fairly great. Alaska is exactly where I've always been living. My working day job is an information officer but I've currently utilized for another one. To play lacross is the factor I love most of all.<br><br>My homepage accurate psychic readings ([http://chorokdeul.co.kr/index.php?document_srl=324263&mid=customer21 chorokdeul.co.kr])

	~~Atkinson friction factor~~ is ~~represented by the symbol <math>k</math> and has the same units as air density (kilograms per cubic metre in [[SI\|SI units]], pounds per cubic foot in [[Imperial unit]]s)~~. It is ~~related to~~ the ~~more widespread [[Fanning friction~~ factor~~]] by~~

	~~<math>~~
	~~k = \frac{1}{2}\rho f,~~
	~~</math>~~

	~~in which <math>\rho</math> is the density~~ of ~~air in the shaft or roadway under consideration and <math>f</math> is Fanning friction factor (dimensionless)~~. ~~It is related to the [[Darcy friction factor]] by~~

	~~<math>~~
	~~k = \frac{1}{2}\rho \frac{\lambda}{4},~~
	<~~/math~~>

	~~in which~~ <~~math~~>~~\lambda</math> is the Darcy friction factor (dimensionless).~~

	~~It was introduced by John J Atkinson in an early mathematical treatment of mine ventilation~~ (~~1862) and has been known under his name ever since.~~

	~~==See also==~~

	* [[Atkinson resistance]]

	~~==References==~~

	* NCB Mining Dept., ''Ventilation in coal mines: a handbook for colliery ventilation officers,'' National Coal Board 1979.

	~~==Further reading==~~
	* [http://~~www~~.~~mvsengineering~~.~~com/admin/images/pdfs~~/~~Practical_Values_of_Friction_Factors~~.~~pdf 1999 paper giving the derivation of <math>k</math>]~~
	* Atkinson, J J, ''Gases met with in Coal Mines, and the general principles of Ventilation'' Transactions of the Manchester Geological Society, Vol. ~~III, p~~.~~218, 1862~~

	~~[[Category:Fluid dynamics]]~~
	~~[[Category:Mine ventilation]~~]

en>Cooperstimson: /* Examples */ Generalizing the second example into a third example set to illustrate the variety of disjunctive sequences.

2013-12-10T17:31:42Z

Examples: Generalizing the second example into a third example set to illustrate the variety of disjunctive sequences.

← Older revision		Revision as of 19:31, 10 December 2013
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	~~I would like~~ to ~~introduce myself~~ to ~~you, I am Andrew and my wife doesn't like~~ it ~~at all~~. ~~tarot card readings -~~ [~~http://conniecolin.com/xe/community/24580 homesite~~] ~~- For years she'~~s ~~been operating as a journey agent~~. ~~Some time~~ in the ~~past he selected to reside~~ in ~~North Carolina~~ and ~~he doesn't strategy on altering it~~. ~~I am truly fond of~~ to ~~go to karaoke online psychic chat (~~[~~http:~~//~~isaworld~~.pe.~~kr/?document_srl~~=~~392088 homesite~~]~~) but I~~'~~ve been using on new issues lately~~.~~<br><br>My blog post ::~~ [http://~~medialab~~.~~zendesk~~.com/~~entries~~/~~54181460-Will-You-Often-End-Up-Bored-Try-One-Of-These-Hobby-Ideas- clairvoyance~~]		'''Atkinson friction factor''' is a measure of the resistance to airflow of a duct. It is widely used in the [[Underground mine ventilation\|mine ventilation]] industry but is rarely referred to outside of it.

			Atkinson friction factor is represented by the symbol <math>k</math> and has the same units as air density (kilograms per cubic metre in [[SI\|SI units]], pounds per cubic foot in [[Imperial unit]]s). It is related to the more widespread [[Fanning friction factor]] by

			<math>
			k = \frac{1}{2}\rho f,
			</math>

			in which <math>\rho</math> is the density of air in the shaft or roadway under consideration and <math>f</math> is Fanning friction factor (dimensionless). It is related to the [[Darcy friction factor]] by

			<math>
			k = \frac{1}{2}\rho \frac{\lambda}{4},
			</math>

			in which <math>\lambda</math> is the Darcy friction factor (dimensionless).

			It was introduced by John J Atkinson in an early mathematical treatment of mine ventilation (1862) and has been known under his name ever since.

			==See also==

			* [[Atkinson resistance]]

			==References==

			* NCB Mining Dept., ''Ventilation in coal mines: a handbook for colliery ventilation officers,'' National Coal Board 1979.

			==Further reading==
			* [http://www.mvsengineering.com/admin/images/pdfs/Practical_Values_of_Friction_Factors.pdf 1999 paper giving the derivation of <math>k</math>]
			* Atkinson, J J, ''Gases met with in Coal Mines, and the general principles of Ventilation'' Transactions of the Manchester Geological Society, Vol. III, p.218, 1862

			[[Category:Fluid dynamics]]
			[[Category:Mine ventilation]]

en>R.e.s.: remove the "orphan" tag, which no longer applies

2012-07-24T03:06:37Z

remove the "orphan" tag, which no longer applies

New page

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