The h Bar

11:30 AM

I got a notification that a package for me has been handed to a neighbour. The neighbour's name was "Herr Briefkasten" - Mr Letterbox. And indeed, the package had just been placed on top of the letterboxes -.-

3

Slereah

Remember to wish mr. letterbox a merry christmas

ACuriousMind

I will! Next time he might not accept a package for me otherwise

Anonymous

11:52 AM

Lol, the deliveryman trolled you...hard. :P I could use that on someone next April.

Anonymous

@ACuriousMind Was it something you ordered online or a gift from someone?

ACuriousMind

@Blue Something I ordered, why?

Anonymous

@ACuriousMind Oh. Weird. (Online) Delivery companies usually have some protocols to follow - like they don't hand it over to a neighbour without the customer's consent (but then, I dunno about Germany but it's true here)

Anonymous

If they did that, you should probably raise a complaint

ACuriousMind

@Blue Uh...most online shops just use the same few delivery services everyone uses (including the standard postal service)

Anonymous

11:59 AM

Ah, I see. It's different here. They deliver stuff directly here

Anonymous

Not by postal service

Anonymous

Which is sorta sorta helpful as you can track the exact location of your package and they even give you the phone number of the deliveryman who's supposed to carry your package

Anonymous

Putting it on the letterbox would be totally unacceptable here, afaik

bolbteppa

2:31 PM

Leonard Susskind on Richard Feynman, the Holographic Principle, and Unanswered Questions in Physics

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user55789

3:20 PM

Heylo, anyone heard of Bethe Ansatz? :P

I have the most simple question but I can't find it explained anywhere

Or at least I'm assuming it's simple, because it's very fundamental

John Rennie

Yes I've heard of it. Why?

Lozansky

Is there a collective term for something that is horizontal or vertical?

John Rennie

@Lozansky serried ?

user55789

@JohnRennie The idea is pretty simple: the one hole excited state is explained many times over

Lozansky

@JohnRennie That's a nice word, but not sure it fits

John Rennie

3:34 PM

@Lozansky I can't think of anything. You could ask on The English language Stack Exchange/

user55789

The way I see it is, making a hole in the distribution of quantum numbers "removes" a rapidity that satisfies the BEs, so really there are no BEs for a particular quantum number, instead the rapidity is q... how am I doing so far?

Lozansky

The context is naming a Java-method that returns the horizontal/vertical path

John Rennie

@user55789 no idea, sorry. I learned the Bethe Ansatz technique at university (like we all did) but I've long ago forgotten the details. There must be a thousand web sites that discuss it ...

Lozansky

So I have one aptly named diagonal that returns a... diagonal path

John Rennie

warp and weft ?

ACuriousMind

3:36 PM

@Lozansky How does the method know whether to return a horizontal or vertical path?

user55789

@JohnRennie Except there are none, I've been looking for six hours now

Lozansky

@ACuriousMind I just check the signs of the difference between the end points for the respective components

user55789

Thanks for your effort tho

ACuriousMind

@Lozansky Ah, I misundersttod what you're doing. You're returning a path that consists only of horizontal and vertical parts, right?

bolbteppa

Kirone Mallick - Bethe Ansatz technique and application (1)

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ACuriousMind

3:41 PM

Sounds like you're finding the shortest path in taxicab geometry. I propose "GetTaxicabPath" ;)

Lozansky

@ACuriousMind Right, it returns a int[][] of the tuples that make up a horizontal/vertical path

Sha Vuklia

Lozansky

I mean, the problem is not the code

It works fine

Sha Vuklia

guys, I have a question.. they say that $\Delta H=Q$ if no “other” work is done (I’m assuming no other work than compression-expansion work). however, we’re dealing with a chemical reaction, so the number (and type) of particles is changing.. I would think then that $\Delta H=Q+\mu_idN_i$.. why isn’t this the case?

Lozansky

The problem is naming the method

But getTaxiCabPath is not a bad name I guess

ACuriousMind

3:44 PM

@ShaVuklia I'm not sure the text implies that that is not the case. If I see this right (and I might not, since thermodynamics is not my strong suit), if you know the stochiometry of the reaction, you already know the $\mu_i \mathrm{d}N_i$ term and don't need to measure it

Sha Vuklia

@ACuriousMind that wouldn't contradict what they're saying, and it makes sense

I guess that will do then:p

Lozansky

I guess the path is orthogonal

John Rennie

@Lozansky rectilinear path?

Lozansky

@JohnRennie Oh that's also good!

Sha Vuklia

this bit seems to imply that $\Delta H$ is the heat $Q$ after all, right? @ACuriousMind

danielunderwood

3:58 PM

ACuriousMind

@ShaVuklia Right. Now that I think about it, why do you think that the chemical potential term is not part of the heat?

Mostafa

One of my friends said they couldn't find the textbook introduced by the instructor for one of their courses. Not on libgen or any other website. He said he decided to email the library of Harvard University and ask for the book, and they have sent him the scanned copy of it!

Sha Vuklia

well, I think because Schroeder calls $\mu dN$ "chemical work", and $Q$ is (kinda) defined as "not work" (I know, this is semantics)

ACuriousMind

At least Wikipedia agrees that the $\mu_i\mathrm{d}N_i$ term is part of the change in internal energy, and heat usually is "change in internal energy during a process".

Sha Vuklia

but mechanical work also changes the internal energy, no?

heat, as defined by Schroeder, is the spontaneous flow of energy due to a temperature difference

Anonymous

4:01 PM

@Mostafa Yeah, they do keep scanned copies for many of their course books. Iirc 0celo also used to send such mails

Sha Vuklia

internal energy is much broader, right?

ACuriousMind

Ugh, this is why I hate thermodynamics :P

Sha Vuklia

:p

I mean, I'm just looking at the thermodynamic identity and the first law of thermodynamics:

ACuriousMind

Just do statistical mechanics instead. It's still boring, but at least it has proper definitions :P

Sha Vuklia

$dU=TdS-PdV+\mu_idN_i$

$dU=Q+W$

@ACuriousMind lol yea, well I have a test, so I have no choice:d

ACuriousMind

4:03 PM

@ShaVuklia Yeah, brilliant how it lets everyone choose which part of the first expression is $Q$ and which part $W$, isn't it? ;P

Mostafa

@ACuriousMind Why is it boring?

Sha Vuklia

well $Q$ is spontaneous energy flow due to T difference, while $\mu dN$ is the change in energy due to particles moving in or out of the system

Anonymous

@Avantgarde Managed to get the bibliography work? :)

Sha Vuklia

so I would think that it should be at least clear that mechanical and chemical work aren't part of $Q$:x

Anonymous

@Mostafa ....compared to string theory, I'd guess :P

ACuriousMind

4:07 PM

@Mostafa Stochastics and probability theory never managed to excite me when I learned them in math, and they didn't suddenly start to when I saw them applied to physics :P

Mostafa

@ACuriousMind You kinda seem to believe that God does not play dice ;)

Anonymous

DanielSank seems to have some affinity for statistical mechanics. I took a noise theory class this semester, and some of his Physics SE answers were really insightful.

Anonymous

Thermodynamics, I agree, can be a bit boring.

Anonymous

Statistical mechanics is fun.

Mostafa

@Blue Yeah, his interests are close to EE students...signal processing, stochastic processes, and even circuit theory

Anonymous

4:12 PM

@Mostafa Well, he is a "quantum electronics engineer", after all ;)

Anonymous

I'd presume he works on fun stuff at Google.

Mostafa

@Blue But his profile reads "quantum electronics physicist"!

Anonymous

@Mostafa He recently changed that :P

Anonymous

Lemme dig up his Martinis group profile

Anonymous

@Mostafa web.physics.ucsb.edu/~martinisgroup/people.shtml

Mostafa

4:15 PM

@Blue Yeah but I'm almost sure that his SE profile was always physicist

Anonymous

@Mostafa Oh, possible then. Maybe I'm confusing it

Anonymous

Feb 26 at 17:39, by DanielSank

@Blue Ah, yes well I get both. I am on the "research scientist" job track, but my role (or whatever) is still Quantum Hardware Engineer. We can write whatever we want as our role ;-)

ACuriousMind

@ShaVuklia Pretty sure that only happens at chemical equilibrium

Sha Vuklia

yea:p

@ACuriousMind wikipedia does say that $dG=\sum \mu_i dN_i$, and since the book is explaining how we would measure $dG$, we probably don't know $\mu_idN_i$ in advance:d

but they do say that it's just an conceptual explanation

I think people are using different definitions at different occasions

basically what you said from the beginning:d

danielunderwood

5:54 PM

@enumaris Just saw this and figured you may find it interesting github.com/sebastianruder/NLP-progress. Looks like it's converted to a nicer version at nlpprogress.com

Sir Cumference

6:22 PM

O RLY?

O RLY? is an Internet phenomenon, typically presented as an image macro featuring a snowy owl. The phrase "O RLY?", an abbreviated form of "Oh, really?", is popularly used in Internet forums in a sarcastic manner, often in response to an obvious, predictable, or blatantly false statement. Similar owl image macros followed the original to present different views, including images with the phrases "YA RLY" (Yeah, really.), "NO WAI!!" (No way!)., and NO RLY. (Not really.) == History == Outside of Internet forums, O RLY? has been referenced in various video games, including World of Warcraft in which...

Anyone remember this?

Good times

danielunderwood

I don't remember it as a sarcastic thing, but I do know of the books google.com/search?q=o+rly+books

dmckee

8:28 PM

@danielunderwood NIce. But you left out the wedge I'm learning all out these days ...

> Realizing that the junior developer you gave a sub-project too didn't quite understand the design, and then figuring out how to fix the resulting mess without trashing either the existing code or the developer's self-confidence.

or does that count as "Dealing with other people"?

danielunderwood

Maybe a little bit of "dealing with other people" and a little bit of "working with someone else's code"?

But joke's on you. The times I've been given a junior dev to work with, they didn't get far enough to make a mess!

ACuriousMind

10:52 PM

@dmckee At least you have a design.

Avantgarde

11:48 PM

@Blue I gave up, for now. I had to work on the main things in the tex file. Bibliography can be done later.

But I will do it later.

For now, I'm trying to see how I can get TeXShop to allow auto-completion of commands.

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