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user54412
12:57 AM
Software recommendation request: Does anyone know of a good program for cataloging scientific papers locally on one's computer (preferably for mac)? I want to be able to sort by author, title, year, or keywords. Also preferably without clobbering my directory structure (so like iTunes for papers, but better). Bibtex interfacing entirely unnecessary.
 
1:49 AM
@ChrisWhite Mendeley (mendeley.com) is what we've used
 
 
1 hour later…
3:03 AM
Hi, how's going?
 
As good as it can typing up a thesis at 5am ;)
 
Well, I'm from Argentina, the time here is 12:05 am. Where are you from?
 
Germany - and the end of the semester has just completely shredded my day-night cycle
 
Oh, Germany... do you like football?
 
I'm afraid not, I just don't get why I should in any way identify with some people doing sports just because they happen to be born in the same country.
 
3:12 AM
Good point. What do you do?
 
I'm studying physics in Heidelberg, currently getting my Bachelor's degree in theoretical phyiscs (gauge theories). How about you?
(I'm also frequently found perusing the manifold bars of this city, however...)
 
Still on school (I'll graduate in 2015), currently in winter holidays.
Started with programming about five years ago and now interested in physics I think...
 
Sounds just like me :) I was also more of a programmer in school, but I somehow lost the passion for that - you're always implementing things when you could be busy discovering them.
 
And how about the income in Germany for physicists?
 
Honestly, I have no clue
The professors seem quite well off, and the assistant workers are not paid too shabby either
 
3:24 AM
That's my worry
 
But I don't know any figures, and if you wanna make real money, you gotta go into the industry
But, as cliche as that sounds, I think you're selling your soul if you do that
 
What do you mean with industry? I don't get the English language very well :P
 
I mean, work for some company as some kind of analyst
Optimising their processes
Perhaps directing a researching subdivision
They definitely pay way more than the universities
 
And why that would be like selling my soul?
 
Because I believe science is about getting to know things, researching things because you would like to understand them
Not researching things because someone is paying you to find a better way to produce some thing X
Of course, you could get lucky and be paid handsomely to research something you're truly interested in
But I don't see that happening for me
 
3:29 AM
Your point of view makes me think a lot... I need to tell you :P
What does the H means? Hydrogen maybe?
 
Of the "h bar"?
 
Yes!
 
It's about Planck's constant
The first indication that the wirld is not classical
*world
 
Oh, I see...
Let me ask you something.
I didn't find anything about this on the internet.
 
And it's a silly pun on "bar", obviously^^
 
3:36 AM
Is there any physic theory or explanation about how a thing looks like when no one is seeing (or looking?) at it?
 
That's difficult
And there is no unique answer
 
@cdonts "Looks" implies an observer. It is emitting or reflecting the same electromagnetic radiation it was when you were looking at it, but no one sees it.
 
It has very much to do whether or not you believe in hidden variables or not
 
@dmckee Is your reply about the English language or physics?
 
And theories that tell you that no observer is required delived the same predictions as theories that tell you it all depends on the observer
 
3:39 AM
@ACuriousMind Now you're getting subtle. The classical answer is easy and pretty good when the object is the tree in the quad.
 
@dmckee: Of course I'm getting subtle - the world is not classical, as much as we wish it were
 
@cdonts A little of both. Mind you the physic my answers uses is classical (pre-quantum) and there are arguments for a subtly different answer you you delve deep into QM.
 
@dmckee Well, you know what I was trying to ask. How it would be properly asked? Seeing or looking?
 
I might frame it as "Does the electromagnetic radiation coming from a unobserved object remain the same as when it was observed."
 
I think, essentially, phyiscs doesn't care about that. Theories are judged by whether or not they predict observations correctly. If a theory says "If you don't look, it's X" and another says "If you don't look, it's Y", how are you ever gonna distinguish between the two?
(if both say "If you look, it's Z", that is)
 
3:44 AM
The classical answer is unambiguously yes, and applies reasonable to macroscopic objects. The quantum answer is "Maybe." and depends on a physical fact that is not uet experimentally probed. You must use the quantum answer in some cases and should use it when talking about the world of the very small.
 
"electromagnetic radiation" sounds like physicists terms... I'm just 16 years old lol
 
@ACuriousMind is one of the user you want to ask about the special cases. I'm not. I keep meaning to make the time to understand entanglement, but so far it hasn't happened.
 
This is really interesting stuff, at least for me. Don't you think?
 
@cdonts. Yeah, it's intriguing. And if you find a definite answer, be sure to let us know ;)
 
I'm sure you'll get the answer before I do it
 
3:52 AM
@ACuriousMind Well, I mean "understand how to set up the math reliably" which is good enough for me.
 
Nice to talk with you guys, take care!
 
@dmckee: It takes a great deal of self-discipline and epistemology to be satisfied with that! I've spent almost a year on digging through every kind of QM I could get my hands on till I finally gave up on "understanding" QM and accepted that that's good enough for all practical purposes
(Fun fact: Bell himself used "for all practical purposes" so often he abbreviated it FAPP)
 
 
2 hours later…
6:12 AM
@ChrisWhite My friends with Macs tend to use Papers, though you have to pay, they have an academic license. Don't use it myself, but others swear by it.
 
 
6 hours later…
12:41 PM
Hi
 
1:34 PM
@ACuriousMind Hah, FAPP? Thats a good one
 
 
3 hours later…
4:41 PM
@ACuriousMind New implementations are discoveries :D
 
@Kyle Kanos: As long as you believe that ;) (More seriously, that's true for a broader stance on discovery than I usually take, but to each their own)
 
Aside from that aspect of discovery, once your code is working, you'll have plenty of physics to explore
The hydro code I'm using, AstroBEAR, is being used for a wide array of astronomical phenomena (star formation, molecular cloud formation, shocked clumps, supernova remnants, etc)
 
That's also true. Sometimes, simulation is the best (or only) way to see what really happens
And, "AstroBEAR"? Physicists always choose the best names :D
 
Astronomical Boundary Embedded Adaptive Refinement
The BEAR part is a particular implementation of Adaptive Mesh Refinement
Basically, AMR level 3 must be fully contained within AMR level 2, which must be fully contained in level 1, which must be fully contained in level 0
Some AMR implementations allow you to have level 3 without level 2 or level 1 beneath it.
 
4:57 PM
I'm afraid I know next to nothing about hydrodynamics or astrophysics, so I've got only a very vague idea what the adaptive mesh may be you are talking about
 
We're limited in solutions by resolution
Higher resolution == better answers, but at the cost of long run times
Lower resolution == bad answers, but very fast simulations
AMR increases resolution in some areas and not in others
 
I see
I guess the trick is to know which areas to resolve higher?
 
Sorta
I mean, we have criteria to set (e.g., density or velocity jumps)
The trick is more how much of the area needs to be resolved
If the density jump is only 2 cells wide, should you only do those two cells, or move out 4 or 6 cells?
And storage of the domain & such
That's pretty complicated too
Well, can be.
 
5:37 PM
Chris White is now stealing AMR ideas to give to the next guy to work on Athena ;)
Bah, no dice on strikethrough.
 
 
3 hours later…
8:07 PM
Heh, it seems people trying to ping @KyleKanos can easily ping me instead by accident. I do like hearing about AMR stuff, so I guess that's fine :)
 
@Kyle Hello
 
@hwlau hi
 
I am pinging you now :)
 
and intentionally too :)
anything going on?
 
I guess you get pinged when one types the gap between the Kyle and the Kanos - so we have write Kyle Kanos' name the wrong way to ping him. What sorcery is that?
 
8:15 PM
just saying hi to you :)
 
well if you just omit the space you get him
@ACuriousMind you writing up your MSc? PhD?
 
@Kyle: Nah, my BSc.
 
ahhh
I guess that one makes more sense at 5am... shorter timescale overall so you don't necessarily need to sleep too much during the process ;)
 
Heh. :D It's rather that my sleep cycle has shifted and made me somewhat vampire-like now that the lectures are over
And somehow I am more focused during the night, though there's not much distracting me during the day either
 
I did the same when I was an undergrad, but now I've gone completely the other way... this is what comes of having a baby, but early starts are kind of nice once I got used to them
was just scrolling up... Heidelberg eh? some good people there :)
 
8:25 PM
I guess so :) I'm very satisfied with the program here so far
 
what's your thesis? some sort of QM stuff?
 
It's basically reviewing the results and techniques for dealing with two-dimensional gauge theories, so one could strech it and say it's QFt, but due to the low dimension it's almost pure topology and group theory instead of the usual messy analysis of QFTs
Most my time is spend deciphering one or two sentences in a research paper and then writing two or three pages about what they did there ;)
(or rather, what I think they did there)
 
I usually call that "doing science"
or one aspect of it, anyway
sounds like some heavy stuff... I took an intro course to particle physics and (standard) QFT, and decided to steer clear after that
 
It's mathy for sure, but it's beautiful math, in my view, at least :)
Admittedly, it's quite a strech till you see the first result you could even remotely think about applying it to the real world, so I understand it's not everyone's kind of thing
 
8:42 PM
well, I could do the math and see the beauty, but the underlying qualitative ideas just never really piqued my interest I guess... was happy to just learn the ideas, had no interest in trying to push the boundaries of the topic
 
Well, we physicists would be a sorry bunch indeed if everyone found the same things interesting
 
true :) so you thinking grad school after this?
 
Yeah, I'm probably gonna stay in Heidelberg for my Master's degree, but would like to go somewhere else for my PhD, just to see a bit of the world
 
nods, lots of fun places to do physics in the world
 
 
1 hour later…
10:15 PM
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Q: What happens after death?

user46147What will happen with my SE account after my death? Is there something that eg. warn foture users not to try contact with me, because I'm dead? Would my account be deleted for preserving servers memory? Could my family make something memorial with this account? What other meta problems are gener...

 

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