Talk:Dissipation

message: The conservation of energy requries that in a closed system (where there is no energy crossing the boundary, either in or out) the total amount remains exactly constant, so adding up all the energies, potential, kinetic, heat gives a constant, measured in joules. Most systems are not closed, and it's a matter of choice where we draw a system boundary.
I think it's important to be clear about the thermodynamic manifestation of energy - the generation of heat is not, of course, loss, it is just a movement of the system towards a more entropic state. The heat and noise created by waves may transfer energy to the atmosphere and coastal matter, but in the overall system there is no energy loss. Looking at the sea as a system means there is energy leaving it, but at the same time the sun and wind add energy to it, so it's a dynamic system with flux in and out. Overall I'd say there is conservation in a closed system, but closed systems can consist of many interacting dissipative systems, all exchanging energy.
I'm sure someone could express this ina neater form, it's early in the day for me.
Jas 11:50, 12 January 2007 (UTC)
thread_title:  Dissipative systems and boundaries 

message: Ephesians 5:18 provides; And do not get drunk with wine, for that is dissipation, but be filled with the Spirit, [5:19] speaking to one another in psalms and hymns and spiritual songs, singing and making melody with your heart to the lord;...
Dissipation used in this biblical context appears to define the term as a concept of a weakening or divided spirituality.  —Preceding unsigned comment added by Jentingh1 (talk • contribs) 12:02, 7 April 2009 (UTC)
thread_title:  Biblical Usage of Dissipation 

message: In many numerical simulations, forms of artificial dissipation are intentionally added in order to make a system numerically stable.  For instance, Runge-Kutta 4 is not always stable when using multigrid methods and various modes can grow exponentially at grid boundaries.  However, it's been found that intentionally adding small amounts of dissipation over the domain can overcome this problem without significantly affecting the physics being simulated.  I don't know the citation but I am certain this is discussed in a book by Kreis and Oliger. —Preceding unsigned comment added by Grigjd3 (talk • contribs) 13:52, 30 September 2010 (UTC)
thread_title: Artificial Dissipation

message: I deleted the new sub-section headed 'Energy' because it had a notion of heat that contradicts present Wikipedia thermodynamic consensus. The deleted quote treated heat as a state variable. The present Wikipedia thermodynamic consensus is that heat is a process variable. The source was of a chatty character in a foreign language and was a unsuitable source for an article of this kind.Chjoaygame (talk) 13:00, 15 March 2014 (UTC)
replies: text: Please provide a source for your claim that the part you mentioned is contradicting the Wikipedia thermodynamic consensus. See for a proper description https://en.wikipedia.org/wiki/Thermodynamics which is very clear on energy and heat. The "deleted quote" treated heat part of a process function, which is considered 101 of Thermodynamics. Prokaryotes (talk) 14:05, 15 March 2014 (UTC)
replies: text: Heat.Chjoaygame (talk) 23:03, 15 March 2014 (UTC)
thread_title:  deleted sub-section 'Energy' 

message: I have deleted the new sub-section headed 'Physics" because it was not about physics. It was about computation. The deleted material may well have a place in an article about computation, but it would not be a good plan to try to extend the reach of the present article to cover dissipation in all its possible meanings. The present article is about dissipation as it is meant in physics, especially in thermodynamics.
True, considering that there are uses of the term 'dissipation' other than in physics, especially in thermodynamics, it would be a good idea to change the heading of the present article to 'Dissipation (thermodynamics)' or to 'Dissipation (physics)'. I am not familiar with the process for changing the heading or title of an article. I know it requires special expertise. If anyone here knows the proper process, I would be glad if they would set it in motion.Chjoaygame (talk) 13:11, 15 March 2014 (UTC)
thread_title:  deleted sub-section 'Physics' 

message: I have deleted the new sub-section headed 'Mathematics'. While an advanced article on physical dissipation could perhaps use such material, it is not suitable for the present article, which is not advanced.Chjoaygame (talk) 13:15, 15 March 2014 (UTC)
replies: text: Hmm, that is because you changed the scope of the article (renaming and such). And this part wasn't new ( i just added a headline), it has been there in your earlier edits. Prokaryotes (talk) 13:52, 15 March 2014 (UTC)
replies: text: Yes, it should not have been there at all, and should have been removed in the past. Just because I make an edit to one part of an article, I am not obliged to fix every fault in that article.Chjoaygame (talk) 23:05, 15 March 2014 (UTC)
thread_title:  deleted sub-section 'Mathematics' 

message: When all else fails, connect the device with good leads, and turn the power switch to the 'on' position. On no account read the instructions. Well, I did read the instructions, and have moved the page to have a more precise title. It didn't need such great expertise after all!Chjoaygame (talk) 13:31, 15 March 2014 (UTC)
replies: text: Ok. Well, if you change the scope of an article you shouldn't just start by deleting everything which falls out of your scope. If you change the scope move the other parts to a new article. Prokaryotes (talk) 13:55, 15 March 2014 (UTC)
replies: text: The inappropriate material that I removed should not have been shoe-horned into the article in the first place. Those who want to post that material should have posted it to a suitable article initially.Chjoaygame (talk) 23:07, 15 March 2014 (UTC)
replies: text:  Chjoaygame (talk), as long this article amounts only to a few paragraph i conclude: No reason to diversify the term at this stage. However, if you insist on term diversity create the relevant articles and move content there, instead of just deleting content. Prokaryotes (talk) 15:03, 16 March 2014 (UTC)
thread_title:  when all else fails 

message: I have written some notes on the physics of dissipation. Also I have deleted the quote from François Roddier because it is in obsolete terminology that would be misleading to readers unless the obsoleteness was pointed out. In current Wikipedia thermodynamics, heat is not produced, it is manifest only in transfer. I have changed some headings. I have not deleted the entries in the section Dissipation (thermodynamics)#Other uses of the term 'dissipation' out of regard for the concerns of one editor, but I think the section should be deleted in due course.Chjoaygame (talk) 11:45, 18 March 2014 (UTC)
thread_title:  edits today 

message: I have more or less repeated my revision of the explanation in the lead. I originally wrote the unrevised explanation some time ago, and looking at it now I see it was not a very lucid explanation. I hope my revision is better. Pace an editor who is concerned about the introduction of the heat engine idea here, I think it is helpful.Chjoaygame (talk) 01:38, 19 March 2014 (UTC)
replies: text: 1.) Pick proper section headlines 2.) Do not spam section headlines 3.) Do not proceed with your rewriting of the article scope unless the related discussion has settled. I find your repeated edits without acknowledging input from others not helpful. Prokaryotes (talk) 17:25, 20 March 2014 (UTC)
thread_title:  another edit