en>Andreschulz: /* References */ accent

2013-12-05T06:40:06Z

References: accent

← Older revision		Revision as of 08:40, 5 December 2013
Line 1:		Line 1:
	~~If you are looking for the best Optometrists~~ in ~~Brampton~~, ~~to get an eye examination, just because you~~ are ~~having some difficulty with your vision, you might be thinking about whether~~ to ~~choose between contact lenses~~ or ~~eyeglasses~~ in ~~Brampton, if such~~ a ~~prescription is given by~~ the ~~doctor~~. ~~Generally~~, ~~choosing between the two purely depends [http://tinyurl.com/pch83be uggs on sale] your personal preference~~, ~~some~~ of the ~~[http://browse~~.~~deviantart~~.~~com/?qh~~=~~&section~~=~~&global~~=~~1&q~~=~~factors factors] like aesthetics, budget, convenience, comfort and lifestyle should be taken into consideration in the process~~ of ~~selection between the two~~. ~~The thing to remember here is~~ that ~~one is not better than the other as each of these~~ two ~~options has their own pros and cons with respect to the health of your eyes~~, ~~easiness to use and in terms~~ of ~~vision~~.~~<br><br>Contact lenses: When you opt for contact lenses in Brampton, it is better to understand~~ the ~~following pros and cons associated with this option~~:<br>~~[http://tinyurl.com/pch83be cheap ugg boots] Pros~~:<br><br>~~1. They conform to the curvature of your eyes, thereby causing lesser vision distortions and providing a wider field of view as compared to the other alternative.~~<br><br>~~2. They will not create any disturbance when you engage in exercising and sporting activities~~<br><br>~~3. They do not fog up because of cold weather like glasses.~~<br><br>~~4. You can try out different contact lenses in Brampton in different colors to match your costume~~<br><br>~~Cons:~~<br><~~br>1. If you frequently work in computer, using lenses can cause a [http://tinyurl.com/pch83be http:/~~/~~tinyurl.com/pch83be] problem called as computer vision syndrome<br~~><br>2. Some people will have a problem in applying lenses in their eyes, but this problem can be rectified with practice.<br><br>3. This alternative can cause dry eye syndrome in some people.<br><br>Eyeglasses: When it comes to Eyeglasses in Brampton, you can enjoy the ~~following pros~~:<br><br>~~Pros:~~<br><br>1. If ~~you have dry eye problems, it [http://tinyurl.com/pch83be ugg boots usa] will not worsen when you use eye glasses as against the [https://www.Vocabulary.com/dictionary/contacts contacts].~~<br><br>~~2. When you use this alternative~~, ~~there will not~~ be ~~any need for touching your eyes as against the contacts~~. ~~So, chances of irritation and infections~~ can be ~~avoided<br><br>3~~. ~~You can get extra protection against external factors like debris~~, ~~dust~~ and ~~wind when you go~~ for ~~this alternative as per~~ the ~~suggestion~~ of ~~optometrists~~ in ~~Brampton~~.~~<br><br>Cons:<br><br>1. When you do not choose~~ the ~~right frame~~, ~~there~~ are ~~chances of pressure to your nose~~ and ~~behind the ears~~, ~~which can lead~~ to ~~headaches~~ and ~~other issues.<br><br>2~~. ~~If you are concerned about aesthetics~~, ~~this cannot~~ be the ~~right option for you~~.<br>~~<br>When you visit an optometrist~~ for an ~~eye exam in Brampton~~, [http://~~tinyurl~~.com/~~pch83be cheap ugg boots] you can consult the professional to suggest the right alternative for you~~. ~~Also~~, ~~regular eye exam in Brampton will be helpful regardless of the option you choose~~.		{{multiple issues\|citation style = June 2012\|context = June 2012\|refimprove = June 2012\|
			{{Underlinked\|date=December 2012}}
			}}

			'''Semibatch''' (semiflow) reactors operate much like [[batch reactor]]s in that they take place in a single stirred tank with similar equipment. However, they are modified to allow reactant addition and/or product removal in time. A normal batch reactor is filled with reactants in a single stirred tank at time=0 and the reaction proceeds. A semibatch reactor, however, allows partial filling of reactants with the flexibility of adding more as time progresses. Stirring in both types is very efficient, which allows batch and semibatch reactors to assume a uniform composition and temperature throughout.

			== Advantages ==
			The flexibility of adding more reactants over time through semibatch operation has several advantages over a batch reactor. These include:

			===Improved selectivity of a reaction===
			Oftentimes a particular reactant can go through parallel paths that yield two different products, only one of which is desired. Consider the simple example below:

			A→V (desired product)<br>
			A→W (undesired product)

			The rate expressions are:

			<math>\frac{dC_V}{dt}</math> = <math>k_1</math> <math>C_A^\alpha</math>

			<math>\frac{dC_W}{dt}</math> = <math>k_2</math> <math>C_A^\beta</math>

			Selectivity of the desired product is defined as:

			S = <math>\frac{dC_V}{dC_W}</math> = <math>\frac{k_1}{k_2}C_A^{\alpha-\beta}</math>

			If <math>\beta > \alpha</math>, the concentration of the reactant should be kept at a low level in order to maximize selectivity. This can be accomplished using a semibatch reactor.

			===Better control of exothermic reactions===
			Exothermic reactions release heat, and ones that are highly exothermic can cause safety concerns. Semibatch reactors allow for slow addition of reactants in order to control the heat released and thus, temperature, in the reactor.

			===Product removal through a purge stream===
			In order to minimize the reversibility of a reaction one must minimize the concentration of the product. This can be done in a semibatch reactor by using a purge stream to remove products and increase the net reaction rate by favoring the forward reaction.

			==Reactor Choice==
			It is important to understand that these advantages are more applicable to the decision between using a batch, a semibatch or a continuous reactor in a certain process. Both batch and semibatch reactors are more suitable for liquid phase reactions and small scale production, because they usually require lower capital costs than a continuously stirred tank reactor operation (CSTR), but incur greater costs per unit if production needs to be scaled up. These per unit costs include labor, materials handling (filling, emptying, cleaning), protective measures, and nonproductive periods that result from changeovers when switching batches. Hence, the capital costs must be weighed against operating costs to determine the correct reactor design to be implemented.

			==References==
			<references/>
			* Hill, C. (1937). An Introduction to chemical engineering kinetics & reactor design. John Wiley & Sons, Inc.
			* Grau, M., Nougues, J., & Puigjaner, L. (2000). Batch and semibatchreactor performance for an exothermic reaction. Chemical Engineering and Processing: Process Intensification, 39(2), 141-148. Retrieved from http://www.sciencedirect.com/science/article/pii/S025527019900015X
			* Heinzle, E. (n.d.). Semi-batch Reactor and Safety. Retrieved from http://www.uni-saarland.de/fak8/heinzle/de/teaching/Technische_Chemie_I/HE3_Semi-Batch Reactor_Text.pdf
			* Wittrup, D. (2007). Reactor Size Comparisons For PFR and CSTR. Retrieved from http://ocw.mit.edu/courses/chemical-engineering/10-37-chemical-and-biological-reaction-engineering-spring-2007/lecture-notes/lec09_03072007_w.pdf

			[[Category:Chemical reactors]]

en>Sun Creator: A to An typo fixing, replaced: has a acute → has an acute (2) using AWB

2012-08-26T21:29:09Z

A to An typo fixing, replaced: has a acute → has an acute (2) using AWB

New page

If you are looking for the best Optometrists in Brampton, to get an eye examination, just because you are having some difficulty with your vision, you might be thinking about whether to choose between contact lenses or eyeglasses in Brampton, if such a prescription is given by the doctor. Generally, choosing between the two purely depends [http://tinyurl.com/pch83be uggs on sale] your personal preference, some of the [http://browse.deviantart.com/?qh=&section=&global=1&q=factors factors] like aesthetics, budget, convenience, comfort and lifestyle should be taken into consideration in the process of selection between the two. The thing to remember here is that one is not better than the other as each of these two options has their own pros and cons with respect to the health of your eyes, easiness to use and in terms of vision. Contact lenses: When you opt for contact lenses in Brampton, it is better to understand the following pros and cons associated with this option: [http://tinyurl.com/pch83be cheap ugg boots] Pros: 1. They conform to the curvature of your eyes, thereby causing lesser vision distortions and providing a wider field of view as compared to the other alternative. 2. They will not create any disturbance when you engage in exercising and sporting activities 3. They do not fog up because of cold weather like glasses. 4. You can try out different contact lenses in Brampton in different colors to match your costume Cons: 1. If you frequently work in computer, using lenses can cause a [http://tinyurl.com/pch83be http://tinyurl.com/pch83be] problem called as computer vision syndrome 2. Some people will have a problem in applying lenses in their eyes, but this problem can be rectified with practice. 3. This alternative can cause dry eye syndrome in some people. Eyeglasses: When it comes to Eyeglasses in Brampton, you can enjoy the following pros: Pros: 1. If you have dry eye problems, it [http://tinyurl.com/pch83be ugg boots usa] will not worsen when you use eye glasses as against the [https://www.Vocabulary.com/dictionary/contacts contacts]. 2. When you use this alternative, there will not be any need for touching your eyes as against the contacts. So, chances of irritation and infections can be avoided 3. You can get extra protection against external factors like debris, dust and wind when you go for this alternative as per the suggestion of optometrists in Brampton. Cons: 1. When you do not choose the right frame, there are chances of pressure to your nose and behind the ears, which can lead to headaches and other issues. 2. If you are concerned about aesthetics, this cannot be the right option for you. When you visit an optometrist for an eye exam in Brampton, [http://tinyurl.com/pch83be cheap ugg boots] you can consult the professional to suggest the right alternative for you. Also, regular eye exam in Brampton will be helpful regardless of the option you choose.

Kinetic smallest enclosing disk - Revision history

en>Andreschulz: /* References */ accent

en>Sun Creator: A to An typo fixing, replaced: has a acute → has an acute (2) using AWB