exchemist
Senior Members-
Posts
4233 -
Joined
-
Last visited
-
Days Won
67
Content Type
Profiles
Forums
Events
Everything posted by exchemist
-
How interesting. Molecular hydrogen can get adsorbed onto iron compounds and may dissociate on the surface into atoms. If it does that, then I would expect it to prefer to pair up with an atom of opposed spin before desorbing again, since that has the lower of the two energy states. But I'm just guessing about the mechanism.
-
I would imagine it has to be via emission and absorption of microwave radiation corresponding to the energy of the transition between the two states, as in nmr. Later note: Sorry, no, it can't be. The probability of spontaneous emission at RF frequencies is negligible, because of the ν³ rule. It must be the presence of fluctuating external fields from neighbouring molecules that does it, cf. spin-lattice relaxation in nmr. (This was all a long time ago so my recollection is hazy, to say the least.)
-
You could start a thread called "Gloss". 😁
-
No it was a fair cop in that I had been using it to poke fun at a Brazilian crank, which was a bit rude of me. But I wasn't being rude about Brazilians, which is what the mod seemed to think. (I'm quite well in with the local Brazilian community, as it happens.) Anyway, the moral of the story for me is that making assumptions about shared culture is risky.
-
True. Though we are starting to see them screw up: Trump, Boris Johnson, Erdogan, Putin, Bolsonaro......
-
Sure. Nativist movements like Trumpism certainly don't tend to come from university students, nor religious fundamentalism.
-
Isn't that where just about all ideologies start? Certainly true of the Reich example.
-
What do you mean by unique in this context? If you mean novel, i.e. one nobody knows about yet, then obviously we can't help you. If you want a UV absorber that only absorbs in a hydrated form, then I'm sure there must be candidates. Possibly some of the organic dyes even. But hard to think of offhand.
-
Not sure you are right about environmentalism. It seems to be the dominant ideology among the young these days, as I know from the associates of my 19yr old son, now at university. .
-
Really? These people are still selling indicator paper impregnated with CoCL2. https://uk.vwr.com/store/product/2994210/cobalt-ii-chloride-paper-in-strips-for-detection-of-water-vapour
-
If Fox loses, it certainly wont be green for them. But I'm not sure why you see Reich vs. Fox as the only 2 choices. Surely we are going somewhere else now, aren't we?
-
Anhydrous cobalt chloride. Goes from blue to pink and is often used to colour dessicants such as silica gel, so you know if they are still active or not.
-
Having been rapped over the knuckles by the mods for referring to Brazil as "where the nuts come from", I suppose I should explain that this is a reference to a catchphrase from "Charley's Aunt". This is a late Victorian farce, subsequently made into more than one film, with a plot involving an Oxford undergraduate in drag, pretending to be an aunt returned from Brazil, "where the nuts come from". https://www.comedy.co.uk/film/charleys_big_hearted_aunt/about/
-
One of the most impressive calculations in theoretical physics
exchemist replied to vova's topic in Speculations
Editions Saint Honoré, which published the book you refer to, is listed here as a publisher not to be used on any account: https://piegesauteur.blogspot.com/2015/11/liste-maisons-dedition.html ("pieges auteur" meaning traps for author.) But you are in Brazil, right? Where the nuts come from? And according to this you have even written to President Lula about your ideas: https://www.researchgate.net/publication/368242832_Request_sent_to_President_Lula Hmm. -
OK. What I would do then is to look up the journal on Wikipedia or something. You can quite quickly tell from that which ones are prestigious or at least well-recognised. It can also sometimes be worth looking up the authors, especially when there is only a single author saying something eccentric, just to make sure he or she is not a well-known crank or charlatan. For suspicious journals you can check Beall"s List of potentially predatory journals: https://beallslist.net For suspected cranks there there is the Encyclopedia of American Loons: https://americanloons.blogspot.com/2022/ , though sadly this is very incomplete and only deals with one country.
-
To my mind this is all getting too speculative to be useful. I can only make a few suggestions as to why it is yellow. Could be protein. Could be a bit of one of the coloured porphyrin type compounds I mentioned. Could be a trace of iron, e.g.: https://en.wikipedia.org/wiki/Iron(III)_acetate . Or something else entirely. Eggshells, like just about anything biological, are not a pure chemical substance. But by all means try heating it to see what happens to the colour, or recrystallising to see if it comes out whiter.
-
Just in case of any doubts about authorship, here is Gareth's paper on Quora: https://www.quora.com/profile/Gareth-Lee-Meredith-1/On-The-Elastic-Paper-Part-II-A-Rebuttal-To-Accusation-and-Further-Insights-When-I-proposed-this-new-theory-a-critiqu?ch=15&oid=100930088&share=8daaadb7&srid=uUK54g&target_type=post
-
There is something called the journal impact factor: https://en.wikipedia.org/wiki/Impact_factor It's far from perfect but it's a lot better than nothing. But I wouldn't have thought you would get a view of what science, collectively, says on a topic from reading research papers. I'd have thought they would be too narrowly focused. How is it that you are in a position where you need to review these articles? Are you a journalist or something?
-
But they are NOT physically realisable. Field lines are a construct, as I said in my previous post, rather like the contours on a relief map. Like field lines, contours are not allowed to cross, but they can touch (at precipices and cliffs). Field lines are a way for us to picture how the field is distributed in space, that's all. They are not really there. When you go walking in the hills, you don't seen any contour lines, do you?
-
No. Don't forget these "lines" (which are just a construct to show how the field behaves) are deemed to be of zero thickness. So they cannot "overlap", unless they actually cross. Which they obviously don't if they emanate from a single point. They simply "tend towards" touching, as you trace them back to the origin.