Maximum coverage problem - Revision history

en>Semihatakan: Operations research people like this problem too (see the 1st reference), added that to the intro.

2014-02-12T18:27:27Z

Operations research people like this problem too (see the 1st reference), added that to the intro.

← Older revision		Revision as of 20:27, 12 February 2014
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	~~{{context\|date=September 2010}}~~		UGGUgg boots, owned by Decker Outdoor Corp., reported earnings last week, and the results were bad.<br><br>

	[~~[Ligand~~]~~] K-edge [[X-ray absorption spectroscopy\|XAS]] is a spectroscopic technique~~ that ~~allows the direct study of metal-ligand bonding~~.<~~ref~~>~~{{Cite doi\|10~~.~~1016~~/j.~~ccr~~.~~2004~~.03.~~020}}<~~/~~ref> In a XAS experiment, electrons~~ in ~~ligand 1s orbitals are excited~~ to ~~unfilled p (~~[~~[principal quantum number]~~] ~~n <= 4) and continuum states. This results in a large spectral feature known~~ as a ~~rising edge~~. ~~Transitions at energies lower than the edge can occur, provided they are~~ to ~~orbitals with some ligand p character~~, and are ~~called pre-edges. Such transitions are often observed in~~ the ~~data of complexes with metal-ligand bonding~~.		Profits were down 31 percent, mostly because women aren't buying [http://tinyurl.com/nqbkz6z ugg boots sale] boots. The company said it was going to slash prices to draw more interest to the boots, but even that isn't guaranteed to help. <br>Until now, [http://tinyurl.com/nqbkz6z ugg boots sale]'s biggest obstacle was image. The boots were seen as sloppy and something women wore with sweatpants. <br>So [http://Www.uggstarted.org/ Ugg started] advertising in fashion magazines to seem more chic. Famous Vogue creative director Andre Leon Talley even came out to endorse the boots, wearing them at New York Fashion Week. <br><br>[http://tinyurl.com/nqbkz6z ugg boots sale] also hired Tom Brady as a [http://www.Adobe.com/cfusion/search/index.cfm?term=&spokesmodel&loc=en_us&siteSection=home spokesmodel] to try and draw men into its stores. So far that move has been successful, and sales are up with the male contingent. <br>But [http://tinyurl.com/nqbkz6z ugg boots sale] faces a terrifying reality: women's boots might be going out of style. <br>"The worst is yet to come," Sam Poser, an analyst at Sterne Agee, told the Huffington Post, adding that "weaker Uggs sales might not just be due to weather, but may indicate that the boots have fallen out of fashion." <br>If that's true, [http://tinyurl.com/nqbkz6z ugg boots sale]'s problems become a lot more daunting. While the company is making strides with men, women's boots make up the vast majority of its business. <br><br>Women are unlikely to shell [http://tinyurl.com/nqbkz6z ugg boots sale] out for Ugg flats or loafers because they are already loyal to other brands. Boots are the core product. <br>If boots are actually out of style, Ugg will have just have to wait for the fashion cycle to turn around. <br>DON'T MISS: It Was Pretty Clear During The Hurricane That Best Buy's Training Initiative Isn't Working >

	~~Pre-edge intensities (D~~<~~sub~~>0</~~sub>) are related to the amount~~ of ~~ligand (L) character in the unfilled orbital:~~

	<~~math>D_0(L \ 1s \rightarrow \psi^) = const \ \vert \langle L \ 1s \vert \mathbf{r} \vert \psi^ \rangle \vert^2~~
	~~= \alpha^2 \ const \ \vert \langle L \ 1s \vert \mathbf{r} \vert L \ np \rangle \vert^2 </math>~~

	~~where <math>\psi^</math~~> is ~~the wavefunction of the unfilled orbital~~, ~~'''r''' is~~ the ~~transition dipole operator~~, ~~and <math>\alpha^2</math> is the~~ "~~covalency" or ligand character in~~ the ~~orbital~~. ~~Since~~ <~~math>\psi^ = \sqrt{1-\alpha^2} \vert M_d \rangle - \alpha \vert L_{np} \rangle </math~~>, ~~the above expression relating intensity and quantum transition operators can be simplified to use experimental values~~:

	~~<math> D_0 = \frac{\alpha^2 h}{3n}I_s<~~/~~math>~~

	~~where n~~ is ~~the number of absorbing ligand atoms~~, ~~h is~~ the ~~number~~ of ~~holes, and I~~<~~sub~~>s</~~sub> is~~ the ~~transition dipole integral which can be determined experimentally~~. ~~Therefore, by measuring the intensity~~ of ~~pre-edges~~, ~~it is possible~~ to ~~experimentally~~ the ~~determine the amount of ligand character in a molecular orbital~~.

	~~==References==~~
	<~~references/~~>

	~~[[Category~~:~~Spectroscopy]]~~
	~~[[Category:Synchrotron-related techniques]]~~
	~~[[Category:X-rays]]~~

en>Baldazen: /* Known extensions */ corrected typo

2012-10-17T14:27:05Z

Known extensions: corrected typo

← Older revision		Revision as of 16:27, 17 October 2012
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			{{context\|date=September 2010}}

			[[Ligand]] K-edge [[X-ray absorption spectroscopy\|XAS]] is a spectroscopic technique that allows the direct study of metal-ligand bonding.<ref>{{Cite doi\|10.1016/j.ccr.2004.03.020}}</ref> In a XAS experiment, electrons in ligand 1s orbitals are excited to unfilled p ([[principal quantum number]] n <= 4) and continuum states. This results in a large spectral feature known as a rising edge. Transitions at energies lower than the edge can occur, provided they are to orbitals with some ligand p character, and are called pre-edges. Such transitions are often observed in the data of complexes with metal-ligand bonding.

	~~Latoria is~~ the ~~identify people use to contact me but I hardly ever really preferred that identify. To participate~~ in ~~[http~~://~~www.britannica.com/search?query=lacross lacross]~~ is ~~a person~~ of the ~~items I really like most. Kansas~~ is ~~in which we've been dwelling for several years~~ and ~~I have almost everything that I need to have~~ in ~~this article~~. ~~Reserving vacations has been my job for some time. Go~~ to ~~my web site to come across out more: http~~://~~transitionlab~~.~~sinnwerkstatt~~.~~com/index.php?title~~=~~Benutzer_Diskussion:Danuta34Kvddlhv~~<br>~~<br>Check out my web blog~~ - [~~http~~:~~//transitionlab.sinnwerkstatt.com/index.php?title=Benutzer_Diskussion:Danuta34Kvddlhv Zapatillas MBT Precios~~]		Pre-edge intensities (D<sub>0</sub>) are related to the amount of ligand (L) character in the unfilled orbital:

			<math>D_0(L \ 1s \rightarrow \psi^) = const \ \vert \langle L \ 1s \vert \mathbf{r} \vert \psi^ \rangle \vert^2
			= \alpha^2 \ const \ \vert \langle L \ 1s \vert \mathbf{r} \vert L \ np \rangle \vert^2 </math>

			where <math>\psi^</math> is the wavefunction of the unfilled orbital, '''r''' is the transition dipole operator, and <math>\alpha^2</math> is the "covalency" or ligand character in the orbital. Since <math>\psi^ = \sqrt{1-\alpha^2} \vert M_d \rangle - \alpha \vert L_{np} \rangle </math>, the above expression relating intensity and quantum transition operators can be simplified to use experimental values:

			<math> D_0 = \frac{\alpha^2 h}{3n}I_s</math>

			where n is the number of absorbing ligand atoms, h is the number of holes, and I<sub>s</sub> is the transition dipole integral which can be determined experimentally. Therefore, by measuring the intensity of pre-edges, it is possible to experimentally the determine the amount of ligand character in a molecular orbital.

			==References==
			<references/>

			[[Category:Spectroscopy]]
			[[Category:Synchrotron-related techniques]]
			[[Category:X-rays]]

2620:0:10C8:1001:A800:FF:FE3A:F94B: rm incorrect definition

2012-07-04T09:19:47Z

rm incorrect definition

New page

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