Photon rocket - Revision history

en>A876: +"Photonic Laser Thruster" and link. +"radiation pressure by emission" and link. replace link.

2014-11-20T00:45:11Z

+"Photonic Laser Thruster" and link. +"radiation pressure by emission" and link. replace link.

← Older revision		Revision as of 02:45, 20 November 2014
Line 1:		Line 1:
	~~'''Ceiling temperature''' (<math>T_c</math>) is a measure of the tendency of [[polymer]]s to revert to their [[monomer]]s. When a polymer is at its ceiling temperature~~, ~~the rate of [[polymerization]]~~ and [[depolymerization]] of the polymer are equal. Generally, the ceiling temperature of a given polymer is correlated to the steric hindrance of the polymer’s monomers. Polymers with high ceiling temperatures are often commercially useful.		36 yr old Financial Expense Adviser Adolfo from Shoal Harbour, has hobbies for example snowmobile riding, ganhando dinheiro na internet and rc model cars. Gets inspiration by making a vacation in Historic Inner City of Paramaribo.<br><br>Look into my page: [http://comoganhardinheironainternet.comoganhardinheiro101.com/ como ganhar dinheiro na internet]

	~~==Thermodynamics of polymerization==~~
	~~At constant temperature, the reversibility of polymerization can be determined using the [[Gibbs free energy]] equation:~~

	~~:<math>\Delta G_p = \Delta H_p - T \Delta S_p</math>~~

	~~where <math>\Delta S_p</math> is the change of [[entropy]] during polymerization~~. ~~The change of [[enthalpy]] during polymerization, <math>\Delta H_p</math>, is also known as the [[heat of polymerization]], which is defined~~ by

	~~:<math>\Delta H_p = E_p - E_{dp}</math>~~

	~~where <math>E_p</math> and <math>E_{dp}</math> denote the activation energies for polymerization and depolymerization, respectively.~~

	~~Entropy is the measure of randomness or chaos. A system has~~ a ~~lower entropy when there are few objects~~ in ~~the system and has a higher entropy when there are many objects in the system. Because the process~~ of depolymerization involves a polymer being broken down into its monomers, depolymerization increases entropy. In the Gibbs free energy equation, the entropy term is negative. Enthalpy drives polymerizations. ~~At low temperatures, the enthalpy term is greater than the <math>T\Delta S_p~~<~~/math~~> term, which allows polymerization to occur. At the ceiling temperature, the enthalpy term and the entropy term are equal. Above the ceiling temperature, the rate of depolymerization is greater than the rate of polymerization, which inhibits the formation of the given polymer.<~~ref~~>~~{{cite book\|last=Carraher Jr\|title=Introduction of Polymer Chemistry\|year=2010\|publisher=CRC Press, Taylor and Francis\|location=New York\|isbn=978-1-4398-0953-2\|edition=2nd\|coauthors=Charles E\|~~page~~=224\|chapter=7}}</ref> The ceiling temperature can be defined by~~

	:~~<math>T_c = \frac{\Delta H_p}{\Delta S_p}</math>~~

	~~==Monomer-polymer equilibrium==~~
	At the ceiling temperature, there will always be excess monomers in the polymer due to the equilibrium between polymerization and depolymerization. Polymers derived from simple [[vinyl]] monomers have such high ceiling temperatures that only a [~~[Wikt~~:~~minuscule#Adjective\|minuscule]] amount of monomers remain in the polymer at ordinary temperatures. The situation for [[alpha-Methylstyrene\|α-methylstyrene]], PhC(Me)=CH<sub>2<~~/sub>, is an exception to this trend. Its ceiling temperature is around 66 °C. [[Steric hindrance]] is significant in polymers derived from α-methylstyrene because the phenyl and methyl groups are bonded to the same carbon. These steric effects in combination with stability of the tertiary benzylic α-methylstyryl radical give α-methylstyrene its relatively low ceiling temperature. When a polymer has a very high ceiling temperature, it degrades via [[bond cleavage]] reactions instead of depolymerization. A similar effect explains the relatively low ceiling temperature for [[Polyisobutylene\|poly(isobutylene)]].

	~~==Ceiling temperatures of common monomers==~~

	~~{\| class="wikitable"~~
	\|-
	~~! Monomer !! Ceiling Temperature (°C)<ref>{{cite book\|last=Stevens\|first=Malcolm P~~.~~\|title=Polymer Chemistry an Introduction\|year=1999\|publisher=Oxford University Press\|location=New York\|isbn=978-0-19-512444-6\|pages=193–194\|edition=3rd\|chapter=6}}</ref> !! Structure~~
	\|-
	~~\| [[1,3-butadiene]] \|\| 585 \|\| CH<sub>2</sub>=CHCH=CH<sub>2<~~/~~sub>~~
	\|-
	~~\| [[ethylene]] \|\| 610 \|\| CH<sub>2</sub>=CH<sub>2</sub>~~
	\|-
	~~\| [[isobutylene]] \|\| 175 \|\| CH<sub>2</sub>=CMe<sub>2</sub>~~
	\|-
	~~\| [[isoprene]] \|\| 466 \|\| CH<sub>2</sub>=C(Me)CH=CH<sub>2</sub>~~
	\|-
	~~\| [[methyl methacrylate]] \|\| 198 \|\| CH<sub>2</sub>=C(Me)CO<sub>2</sub>Me~~
	\|-
	~~\| α-methylstyrene \|\| 66 \|\| PhC(Me)=CH<sub>2</sub>~~
	\|-
	~~\| [[styrene]] \|\| 395 \|\| PhCH=CH<sub>2</sub>~~
	\|-
	~~\| [[tetrafluoroethylene]] \|\| 1100 \|\| CF<sub>2</sub>=CF<sub>2</sub>~~
	\|}

	~~==References==~~
	~~{{reflist}}~~

	~~[[Category:Polymer chemistry]]~~
	~~[[Category:Enthalpy]]~~
	~~[[Category:Thermochemistry]~~]

en>Addbot: Bot: Migrating 1 interwiki links, now provided by Wikidata on d:q7187861

2013-03-22T11:11:41Z

Bot: Migrating 1 interwiki links, now provided by Wikidata on d:q7187861

← Older revision		Revision as of 13:11, 22 March 2013
Line 1:		Line 1:
			'''Ceiling temperature''' (<math>T_c</math>) is a measure of the tendency of [[polymer]]s to revert to their [[monomer]]s. When a polymer is at its ceiling temperature, the rate of [[polymerization]] and [[depolymerization]] of the polymer are equal. Generally, the ceiling temperature of a given polymer is correlated to the steric hindrance of the polymer’s monomers. Polymers with high ceiling temperatures are often commercially useful.

			==Thermodynamics of polymerization==
			At constant temperature, the reversibility of polymerization can be determined using the [[Gibbs free energy]] equation:

	Are you affected by a continuing deficiency of energy? Could it be challenging so that you can complete tasks your peers appear to have no troubles with? Are you heavy or attempting to lose weight? If you cherished this report and you would like to receive far more information with regards to [http://~~videobookface.com/bookmarks/view/486792/improve-your-nutrition-today-with-these-effective-tips best weight gainer for sensitive stomach~~] ~~kindly check out our own page~~. ~~Should you solution indeed to the questions, to~~ [~~http://whackynet.com/groups/reasons-why-planks-are-superior-to-stomach-crunches/ eliminate~~] ~~the trouble you need to combine an exercise routine. Carry on and check this out article to learn how to get started your new exercise program.~~<br><br>~~The table click~~, ~~squat and deadlift certainly are a essential exercise routines to pay attention to. There exists a good reason these workouts are regarded~~ as the ~~basis~~ of ~~proper [http~~://~~riddlesandpoetry.com/?q=node/181836 absolute best weight gainer] training. Those are the workouts which will increase your energy~~ and ~~muscular mass. Consist of these 3 in some manner at every workout.~~<br><br>~~Appropriate warm ups are essential if you would like develop muscular mass. As your muscle tissue work, repair~~ and ~~increase~~, ~~they come to be more prone to accidents~~. ~~When you heat, accidents may be averted~~. ~~Warm up by completing~~ a ~~cardio exercising, like operating over~~ a ~~treadmill~~, ~~for 10 minutes before starting strength training~~, ~~then begin with some light representatives to get into~~ the ~~groove~~.<br><br>~~Don't overlook carbs when trying~~ to ~~construct muscle mass~~. ~~Carbs are~~ the ~~factor that provides your own muscles~~ the ~~electricity essential to perform daily~~ and ~~recuperate for~~ the ~~next~~. On the ~~whole~~, ~~should you figure out frequently~~, ~~then you must consume a couple gr~~ of ~~carbohydrates for each and every pound of your respective bodyweight~~.<br><br>~~Consider to go into as much reps and units as you~~ can ~~while~~ in ~~each~~ and ~~every weight training treatment~~. ~~Objective fifteen lifts, permitting~~ a ~~minute bust between each set up. As a result, you are making your lactic acids movement, which often, aids muscles growth. You will maximize your strength training by~~ [~~https~~:~~//independent~~.~~academia.edu/MMulgrave/Posts/3056395/You~~-~~could~~-~~possibly-believe-that-it-takes-several-years-of-tough-gym-time-to-get-muscle-tissues.-Musc committing~~] ~~to this many times in the course of all of your sessions.~~<br><br>~~Given that you may be eliminating a lot more energy than usual~~, it is ~~crucial that consume properly on days and nights you lift up. Fuel up for your exercising session by taking in a few energy~~ an ~~hour well before moving~~ to ~~the gym~~. ~~This doesn't mean you need to eat too much on workout days and nights, but take in over you normally do~~ in the ~~times you don't go~~ to the ~~health club~~.~~<br><br>In order to make sure that you have~~ the very [~~http://ganga94~~.~~byethost24~~.~~com/user/?action~~=~~user&id~~=~~2125 best calorie weight gainer] muscles expansion you can, it is crucial you conduct compound exercises. These types~~ of ~~exercise routines use a great deal of diverse muscle groups in one elevate~~. ~~Am illustration can be a bench press that assists work out shoulder muscles~~, ~~tricep, and also the upper body in one exercise.~~<br><br>Do not workout for longer than one hour. When exceeding beyond 1 hour, your system will begin to increase its quantity of cortisol, and that is a anxiety hormone. Extra cortisol could prohibit androgenic hormone or testosterone as well as your efforts at muscle building may be wasted. Ensuring workouts are less than an hour or so assists you to to get the [~~http:~~//~~www.abcshop24.com~~/~~author~~/~~nablyth~~/ ~~best weight gainer no fat~~] ~~results.~~<br><br>Following exercising it is vital to stretch out, so your muscle tissues can build and maintenance them selves nicely. If you are below 40, maintain your expands for no less than thirty seconds. Individuals around 40 ought to keep on their stretches for 1 minute. This will aid stop accidents.<br><br>~~When start a muscle mass~~-developing plan, many individuals improve the quantity of proteins they take in an excessive amount of too early. Should you be taking in far more protein and energy than you happen to be employing, then you will gain fat instead of muscle. Ease towards you in a higher-~~protein diet program which means that your body has an opportunity to adjust. Progressively raising your absorption by~~ 2 ~~or 3 one hundred calorie consumption at two~~- ~~or a few~~-~~day time durations is smart.~~<br><br>With some body weight picking up exercises, keeping the quantity you are weightlifting to a minimum will manage to benefit you. It is possible to danger critical damage by performing neck work, dips and break up squats that may involve risky joint jobs. More weight must be restricted to larger workout routines like lines, presses, dead raises and leg squats.<br><br>~~It bears practicing that efficient~~ [~~http~~:~~//Www.Hooddirectory.com/helpful-ways-to-construct-new-muscles-speedy/ bodybuilding depends~~] upon more than your dedication or maybe the volume of the routines. You should keep your right point of view to get outcomes. Apply the ideas using this write-up and make a muscle development strategy that will provide you with robust muscle tissues in the speedy fashion.		:<math>\Delta G_p = \Delta H_p - T \Delta S_p</math>

			where <math>\Delta S_p</math> is the change of [[entropy]] during polymerization. The change of [[enthalpy]] during polymerization, <math>\Delta H_p</math>, is also known as the [[heat of polymerization]], which is defined by

			:<math>\Delta H_p = E_p - E_{dp}</math>

			where <math>E_p</math> and <math>E_{dp}</math> denote the activation energies for polymerization and depolymerization, respectively.

			Entropy is the measure of randomness or chaos. A system has a lower entropy when there are few objects in the system and has a higher entropy when there are many objects in the system. Because the process of depolymerization involves a polymer being broken down into its monomers, depolymerization increases entropy. In the Gibbs free energy equation, the entropy term is negative. Enthalpy drives polymerizations. At low temperatures, the enthalpy term is greater than the <math>T\Delta S_p</math> term, which allows polymerization to occur. At the ceiling temperature, the enthalpy term and the entropy term are equal. Above the ceiling temperature, the rate of depolymerization is greater than the rate of polymerization, which inhibits the formation of the given polymer.<ref>{{cite book\|last=Carraher Jr\|title=Introduction of Polymer Chemistry\|year=2010\|publisher=CRC Press, Taylor and Francis\|location=New York\|isbn=978-1-4398-0953-2\|edition=2nd\|coauthors=Charles E\|page=224\|chapter=7}}</ref> The ceiling temperature can be defined by

			:<math>T_c = \frac{\Delta H_p}{\Delta S_p}</math>

			==Monomer-polymer equilibrium==
			At the ceiling temperature, there will always be excess monomers in the polymer due to the equilibrium between polymerization and depolymerization. Polymers derived from simple [[vinyl]] monomers have such high ceiling temperatures that only a [[Wikt:minuscule#Adjective\|minuscule]] amount of monomers remain in the polymer at ordinary temperatures. The situation for [[alpha-Methylstyrene\|α-methylstyrene]], PhC(Me)=CH<sub>2</sub>, is an exception to this trend. Its ceiling temperature is around 66 °C. [[Steric hindrance]] is significant in polymers derived from α-methylstyrene because the phenyl and methyl groups are bonded to the same carbon. These steric effects in combination with stability of the tertiary benzylic α-methylstyryl radical give α-methylstyrene its relatively low ceiling temperature. When a polymer has a very high ceiling temperature, it degrades via [[bond cleavage]] reactions instead of depolymerization. A similar effect explains the relatively low ceiling temperature for [[Polyisobutylene\|poly(isobutylene)]].

			==Ceiling temperatures of common monomers==

			{\| class="wikitable"
			\|-
			! Monomer !! Ceiling Temperature (°C)<ref>{{cite book\|last=Stevens\|first=Malcolm P.\|title=Polymer Chemistry an Introduction\|year=1999\|publisher=Oxford University Press\|location=New York\|isbn=978-0-19-512444-6\|pages=193–194\|edition=3rd\|chapter=6}}</ref> !! Structure
			\|-
			\| [[1,3-butadiene]] \|\| 585 \|\| CH<sub>2</sub>=CHCH=CH<sub>2</sub>
			\|-
			\| [[ethylene]] \|\| 610 \|\| CH<sub>2</sub>=CH<sub>2</sub>
			\|-
			\| [[isobutylene]] \|\| 175 \|\| CH<sub>2</sub>=CMe<sub>2</sub>
			\|-
			\| [[isoprene]] \|\| 466 \|\| CH<sub>2</sub>=C(Me)CH=CH<sub>2</sub>
			\|-
			\| [[methyl methacrylate]] \|\| 198 \|\| CH<sub>2</sub>=C(Me)CO<sub>2</sub>Me
			\|-
			\| α-methylstyrene \|\| 66 \|\| PhC(Me)=CH<sub>2</sub>
			\|-
			\| [[styrene]] \|\| 395 \|\| PhCH=CH<sub>2</sub>
			\|-
			\| [[tetrafluoroethylene]] \|\| 1100 \|\| CF<sub>2</sub>=CF<sub>2</sub>
			\|}

			==References==
			{{reflist}}

			[[Category:Polymer chemistry]]
			[[Category:Enthalpy]]
			[[Category:Thermochemistry]]

en>Metsavend: /* References */

2012-07-28T21:08:40Z

References

New page

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On the whole, should you figure out frequently, then you must consume a couple gr of carbohydrates for each and every pound of your respective bodyweight. Consider to go into as much reps and units as you can while in each and every weight training treatment. Objective fifteen lifts, permitting a minute bust between each set up. As a result, you are making your lactic acids movement, which often, aids muscles growth. You will maximize your strength training by [https://independent.academia.edu/MMulgrave/Posts/3056395/You-could-possibly-believe-that-it-takes-several-years-of-tough-gym-time-to-get-muscle-tissues.-Musc committing] to this many times in the course of all of your sessions. Given that you may be eliminating a lot more energy than usual, it is crucial that consume properly on days and nights you lift up. Fuel up for your exercising session by taking in a few energy an hour well before moving to the gym. 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Ensuring workouts are less than an hour or so assists you to to get the [http://www.abcshop24.com/author/nablyth/ best weight gainer no fat] results. Following exercising it is vital to stretch out, so your muscle tissues can build and maintenance them selves nicely. If you are below 40, maintain your expands for no less than thirty seconds. Individuals around 40 ought to keep on their stretches for 1 minute. This will aid stop accidents. When start a muscle mass-developing plan, many individuals improve the quantity of proteins they take in an excessive amount of too early. Should you be taking in far more protein and energy than you happen to be employing, then you will gain fat instead of muscle. Ease towards you in a higher-protein diet program which means that your body has an opportunity to adjust. Progressively raising your absorption by 2 or 3 one hundred calorie consumption at two- or a few-day time durations is smart. 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