« first day (2225 days earlier)   

12:02 AM
@dmckee Emilio has posted it before, and I think you've also reacted to it before
 
@ACuriousMind ::Tosses potato::
 
I still can't tell whether Lego Grad Student is dark humor or just depressing.
@DanielSank ::activates automated anti-potato defense system::
(Yes, I have taken precautions for @BernardMeurer's eventual stab at world domination ;) )
 
If by stab you mean success I might just let you survive
 
12:18 AM
@dmckee no, it's a thing. It's pretty new but it's got a hell of a voice, you should check it out. Only problem is it's maybe the bleakest commentary on grad school ever.
I've posted some highlights here before, I'm sure search will bring them up easy
 
I read the more recent ten pages or so. I identified with bits of it, but didn't want to get into it in more depth.
 
Fair enough
There isn't all that much back material tbh
 
vzn
@EmilioPisanty nice work, reminds me of phd comic. saw the movie somewhat recently, not bad. that reminds me, a lego movie sequel is coming out soon (early) next yr, a lego fanatic salesman in the store just told me... did you see the 1st one?
 
@vzn yeah, much the same vein
Except Jorge Cham started head school well past a decade ago, and he pretty much ran out of steam, I think
 
vzn
@EmilioPisanty lol so did watterson :P ... theres a great documentary on him too... saw it, liked it... :)
 
12:24 AM
"Anderson and DeWitt were the first to consider the free scalar field in the trousers spacetime. They argued that the crotch singularity produces an infinitely bright flash, which was interpreted asevidence that the topology of space is dynamically preserved. "
Intensely bright flash at the crotch
I like Krasnikov
He is just so very determined to show that time travel is real
 
12:44 AM
@Slereah Was there really no better word for it than the "crotch singularity"?
 
@ACuriousMind Due to the topology of the spacetime, it is actually a naked crotch singularity
 
Wonderful
 
Do string theorists also like to have fun?
I know they do a lot of pants diagrams
Is there a crotch interaction
 
Well, you can build all of the 2D manifolds that are the "Feynman diagrams" for string perturbation by gluing pants together
But I don't think they have something that can rival the crotch singularity
 
that's a lot of pants
the trouser spacetime is pretty poorly known
I've seen like two papers talking about it
 
12:58 AM
I started a bounty on a Chemistry question and it's ending in 11 hours. Please, if anyone has any thoughts relevant to my question, think about posting them as an answer. I still haven't accepted the single answer that I've received so far:
 
@Kaumudi I have no idea what the "inductive effect" in chemistry is, but I don't see what is unsatisfactory about the given answer
I read the question and the answer and had a rather strong impression the given answer actually answered it.
 
No, not fully. The 2nd part of his answer is really confusing. We just had a small discussion at The Periodic Table and still didn't reach any sort of consensus.
 
@Kaumudi I'm afraid I don't see what's confusing about it, but then again I don't know much about this sort of chemistry
 
1:54 AM
Is there a smeared version of GR
Where quantities are measured over test functions
I think the Colombeau version of GR is
 
@ACuriousMind Want to see a magic trick?
 
Does it involve rabbits?
 
2:12 AM
@ACuriousMind No :/
 
2:45 AM
I am currently marathoning Enterprise
The worst of all Star Trek
 
Your masochistic trait is more pronounced than I ever imagined :P
Although I recently tried to rewatch DS9 and it didn't go too well, either. I didn't remember the acting being that wooden.
 
rob
Heh, I just started re-watching DS9 and I had the same thought. But given the difference between TNG season 1 and the "good" TNG, I'm prepared to hold out for a while yet.
 
@rob DS9 is awesome.
 
rob
I remember that discovering TNG on television as a kid changed my life for the better ... but if a rerun came on where Riker didn't have a beard, it was pretty safe to shut the thing off.
 
3:00 AM
Hm, I fear if I try to watch TNG again, my nostagia might take a critical hit :P
 
rob
I was excited when DS9 started, but never really got into it ... I wonder whether I watched the first season and never went back.
 
In contrast to DS9, Babylon 5 was as good as I remembered it when I watched it again.
 
rob
It's definitely more painful to watch Star Trek now that I know more about science than their writers did.
The thing that gets me most is the spurious precision.
"We've contacted these aliens for the first time, and their deflector shields have INCREASED BY TWO POINT FOUR PERCENT, OMG"
 
@ACuriousMind TNG doesn't stand up that well for me.
Some episodes are great, but the show as a whole is less so.
DS9 is a lot more watchable as a show for me.
 
3:21 AM
Well
I tried to watch Enterprise before
And I gave up
But I'd like to say
I watched ALL of Star Trek
And it's the only one left
 
rob
Next you have to read all the paperback novels, though.
 
nah
I'm fine with it
I don't think it's even canon
 
rob
And did you find the TOS-inspired animated series?
 
It was amusing
Especially when Spock summons the devil
Also for some reason there was a Kzinth episode
 
 
2 hours later…
5:13 AM
Hi, everyone :-)
I've a quick question for anybody who knows some inorganic chemistry.
We have:
$Al: [Ne]3s^2, 3p^1$ and $Mg: [Ne]3s^2$
Since the penetration of the $s-$ orbital is more than that of the $p-$ orbital, it becomes clear that the first ionization energy of Magnesium is greater than that of Aluminum.
The same argument must apply to $Si: [Me]3s^2, 3p^2$. However, we find that the first ionization enthalpy of $Si$ is higher. Is this because the increase in nuclear charge compensates for the reduced penetration of the $p-$ orbital?
 
5:41 AM
@JohnRennie : Hi. According your answer to this question, metals can't be used as an antenna in optical frequencies. But actually there is a type of antennas which operates in optical frequencies. How can it be explained then? Thankyou.
 
6:21 AM
@JohnRennie: Too busy with work these days?
 
@Kaumudi Morning. It's a bit busy this morning, but nothing too serious :-)
 
I see. Morning :-)
 
6:40 AM
@Kaumudi re your question about screening: the 3s orbital is closer to the nucleus that the 3p oribtal in some vague way that we're not going to fully define.
So you'd expect the 3p ionisation energy to be lower simply because the electron is farther away from the nucleus and therefore the magntiude of the electrostatic binding energy is smaller.
It isn't really a screening effect.
Now as you add elecrons to the 3p orbital the 3p electrons are all at the same distance from the nucleus, and they don't completely screen each other. So each successive 3p electron sees a slightly higher effective nuclear charge.
As a general rule, as you full an orbital the atom gets smaller and the ionisation energy increases.
 
7:04 AM
Oops, sorry, I'd gone to have lunch!
 
"A pump is required to lift 800 kg of water per minute from a 10 m deep well and eject it with a speed
of 20 m/s. The required power in watts of the pump will be ? "...can anyone here answer this question? I can calculate the work done to raise the water by 10 m but how do i take into account the work done to eject it with a velocity 20 m/s
 
I don't believe this.
 
Hmm, OK, it makes sense. Thank you :-)
 
I come home from work, get the mail, see an issue of Physics Today.
Warm up some leftover dinner (sausage and apples) and sit down at the table to eat and read a few articles.
I almost never do this. I usually toss those magazines in the trash immediately.
However, this evening, for some reason, I felt motivated to read a bit.
I open the magazine and browse the table of contents. Oh, neat! An article about artificial intelligence.
I start reading...
The article is about a research group that investigates an AI while it's running and learn things about the nature of consciousness.
Wow!
At some point the article mentions an AI mishap that occurred in 2096.
That's odd... that's in the future.
Then I realize this section of the magazine is a set of articles written as imagined in 2116.
They're all science fiction.
I was so mad that I flipped to the equipment advertisements and read about lock-in amplifiers.
@BernardMeurer @ACuriousMind @Danu you might find that amusing.
 
physics.stackexchange.com/questions/297096/… Can anyone here answer this question please ?
0
Q: Power required by pump to lift water and eject it with certain velocity

TheStackExchange A pump is required to lift $m \space kg$ of water per minute from a $h$ metres deep well and eject it with a speed of $v \space ms^{-1}$. The required power in watts of the pump will be? The above question is from my textbook exercise. I have removed the numerical values from the origin...

Okay....I solved it now ^...nevermind
(deleted)
 
7:25 AM
Indian Physics journals (with names Physics Today and Physics Spectrum) are mostly problem solving. It is sad that Indians seldom get a chance of experiencing the aesthetic side of physics.
 
7:46 AM
@JohnRennie: Halp! (Regarding s'thing other than phy/chem/math :-P)
 
@Kaumudi Yes?
 
You wake up pretty early, correct?
..?
 
Yes, generally about 5 a.m.
 
And dyou find yourself super sleepy at any other time of day?
 
No. Not usually. Only after one of my giant weekend lunches :-)
 
7:52 AM
:-P I see.
 
I have always had a tendency to insomnia, so I'm very disciplined in my sleeping habits. I always go to bed at 9 p.m. and I always wake at 5 a.m.
 
And for how long have u been waking up at this time?
 
If i start changing my sleeping time then I find I can't sleep and feel tired all day.
@Kaumudi Can't remember - years. Though when i was your age I would stay upmuch later and get up later.
 
Oh, I see.
Years?! Well, that explains it, then.
 
It's not unusual for intensive studying to mess with your sleep cycle. Especially when you're doing it on your own as you are.
 
7:54 AM
:-/ I see.
 
Studying under those circumstances is a surprising stressful thing to do. I suffered a bit in the last couple of months before my university finals.
 
Ohh, I see. Cambridge and all, so I imagine that it really was very stressful, eh?
 
I don't think there's a lot you can do about except try to relax as much as possible and bear in mind that it will be over soon ...
 
Yes, I guess. Thank you :-)
 
@Kaumudi it's much easier when you're surrounded by your friends. You're certainly doing it the hard way!!
 
7:57 AM
:-P Yeah, I can imagine.
 
I've currently got Star wars IV playing on your laptop to test the battery, and it's really good. You forget what a good film it is :-)
 
"My" laptop. Boy, that feels nice to hear :-D I dunno when I'll stop thanking u!
 
Obi Wan has just started teaching Luke how to use a light saber ...
 
I dunno who either of those two people are :-P I promise to catch up next year!
 
@JohnRennie 9pm to 5 am is 8 hours. You're really disciplined.
 
8:07 AM
@Kaumudi Star Wars
 
Yep, Ik that!
 
Now they're in the bar in Mos Eisley. Did Han shoot first?!!!
@SwapnilDas I have to be. If you have trouble sleeping then having a strict sleeping schedule is really important.
 
I see.
 
@JohnRennie Who are u hoping will reply? :-P
 
"Han shot first" is a phrase referring to a controversial change made to a scene in Star Wars (1977), in which Han Solo (Harrison Ford) is confronted by the bounty hunter Greedo (Paul Blake) in the Mos Eisley cantina. The change was made for the 1997 Special Edition re-release of Star Wars, and has since been altered twice more. The phrase "Han shot first" is meant to express that "Han was the only one who shot", and is a colloquial retort to series creator George Lucas's explicit cinematic assertion that Greedo shot first. == Scene == Han Solo and Greedo both independently work for Jabba the...
 
8:17 AM
My god, SW is a lot famous than I thought.
 
Ohh :-P
For anybody having a bad day, BTW:
 
That ^ is the Nyan cat, whose body has been replaced by a NAND gate.
 
Ellis did a paper on singularity classification
 
@Slereah John Ellis?
 
8:19 AM
Georges Ellis
 
Ohk.
 
For me, most of my taking a test dreams are reflecting that I have obligations or responsibilities that I don't like and keep on procrastinating them, but it is getting more and more urgent to get them to finish. For example over the past months, I had a couple of dreams where I failed my english, chinese, maths, lab etc. tests and assignments. They can all be traced back to the fact that I keep procrstinating for my driver license test studying cause it is simply SO BORING but necessary
---
Falling teeth dreams often relates to my stress level
typo: peast=past
 
I dreamed I was a middle aged computer nerd - what a horrible nightmare :-)
 
@JohnRennie "dreamed"
 
@DanielSank I haven't woken up yet. This can't be real life, I mean, it's just too absurd :-)
 

« first day (2225 days earlier)