The h Bar

12:46 AM

@heather it's Saturday night, go do something fun

1:29 AM

does anybody here knows Induction Coupled Plasma or
Induction Coupled Plasma Spectroscopy?

Giskard42

1:42 AM

@Sweeper Funny you should ask that, I was just about to ask if anyone here knows anything about PVD systems, I know just enough about induction plasma to be deemed "incompetent"

My only attempt ended in failure and misery, but I blame that on my test equipment

@Sweeper What are you trying to do?

2:04 AM

@0celo7 I am...

physics = fun

6

we did go out for pizza - that was nice.

2:24 AM

@Sweeper, out of curiosity, what's your question (I probably/definitely won't be able to answer)

@heather I'm standing in line for popcorn

Giskard42 I am trying to turn small amount of gases into plasma,but stationary gases at atmosferic pressure,becose Induction Coupled Plasma is specific term that means certain industrial process that use flowing,low pressure and high volume gas

I have three big questions 1. Why does the Induction Coupled Plasma use RF freqency? I saw numbers between 13mhz up to 40mhz! There must be good reason for that becose 40mhz electronics at power like 1000 watt is much more expensive than 60hz Induction Heating of steel for example

@loltospoon That piece of information is suppose to be taken in combination with the knowledge that the zero of potential energy is set at infinite remove.

2. Why do electrodeless lamps use PHOTONS and not AC magnetic field to ionise gas? Why they use magnetrons and not coils?

@0celo7 where are you at? movie theater? amusement park?

2:28 AM

So, if at any finite distance the total energy is less than zero, then the system can't get to infinite remove: it's bound.

The graph shows you unambiguously that this is possible. To actually arrange that a bond occurs you need to bring an electron in and then lose some energy somehow.

I hate the term electro magnetic.... becose every moving electron or photon is described as "electromagnetic" but magnetic,electric and photon is three different things so when I tried to study on internet its giant cluster f-word becose all there ways to make ionised gas are described as electromagnetic

@Sweeper they arent really that different as far as things go

2:45 AM

I disagree! Magnetic ionisation is solenoid coil using high current..... electric ionisation is electrode using high voltage..... electromagnetic wave aka photon ionisation uses crystal like ruby or nd:yag and is pumped by flashtube

2:59 AM

ah, nevermind, figured out the nuclear physics question

only to find a new one in the next sentence

geesh

brehmsstrahlung?

are they trying to get people to misspell it?

so (generally) electrons decelerate as they come near a nucleus and emit a photon...okay...

but why does this affect higher energy electrons more than lower energy electrons? surely it'd depend more on how nuclei-dense the area was...

3:23 AM

asked a question about the above here if anyone's interested

3:41 AM

@heather It makes sense in German: the "ss" is a transliteration of a ß.

@dmckee oh yeah - the esset, right?

Yeah.

thank you for your comments by the way - I'm pulling up the Particle Data Book right now.

Of course, now that I look I find I'm wrong. It's spelled "ss" auf Deutsch, too.

and for the first comment - the faster car lost the most. though i'm not quite sure i get intuitively why that is.

3:47 AM

The intuition is tricky. In the math is just comes from the $v^2$ dependence which means slope increases with velocity. But to get why you have to really think about hte meaning of work and how the distance covered comes into play.

One of Ron M's old answer is a very nice treatment: physics.stackexchange.com/a/14752/520

okay, i'll read through that. also in the latest review of particle physics i can't find a chapter titled passage of radiation through matter. there is one called passage of particles through matter, is that it?

@heather Yeah. That's the one. I forget when they changed the title, but I still recall the old one.

okay

when you said hard sledding, you weren't kidding.

i'll give it a go, though =) thanks so much

4:12 AM

@heather Chicago

nice.

sorry to bug you @0celo7, but since you study nuclear engineering I thought I'd ask you - would you mind looking at this question?

isn't he in the middle of watching a movie?

although that would be a great test of multitasking :-)

oh, i didn't realize he was in a movie

i thought he was just in chicago

@heather whats the difference at that point

um...a city vs a movie theater

seems a fairly large difference to me =)

4:26 AM

all of life is a stage, and i bet chicago shenanigans rival the theater sometimes

2 hours ago, by 0celo7

@heather I'm standing in line for popcorn

"All the world's a stage, And all the men and women merely players" - As You Like It, Act II, Scene VII

satyatech

Who is the watcher(audience)--- non-men and non-women ...lol

@heather

4:48 AM

@satyatech its actually a quantum superposition of them

6:30 AM

@skillpatrol @heather Chicago is a musical

@heather It's spelled bremsstrahlung.

user228700

6:46 AM

@JohnR: Morning :-)

Morning :-)

7:05 AM

hello @JohnRennie

have you heard of this book?

thenextweb.com/media/2013/01/15/…

No, that's new to me. But then I don't use Quora.

What do you think if one where to produce a similar book for SE

would one legally be able to publish such a book?

I'm not sure. The licencing for posts on Stack Exchange is documented somewhere.

There's a "legal" link in the footer

it is creative commons with attribution required

interestingly JEff states attribution should include a hyperlink

not sure how to include a hyperlink in a physical book though

7:10 AM

You could legally publish a book like that for SE as long as you distribute it under the CC license

@Kenshin You could just print the URL

yeah

@DavidZ do you think I could sell the book to recoup publishing costs?

or would the book need to be free?

There's no requirement that the book is free

yeah I thought so, so long as the content is under CC license

FWIW, there are CC licenses that prohibit commercial use, and if SE used one of those, then the book would have to be free (or maybe you could charge the cost of preparing a physical copy, if you were distributing physical copies)

But they have chosen a license without that particular restriction

nice

so the next step is to check if anyone is interested in the idea of a best of SE book

would you prefer to see a best of Physics SE, or a best of SE in general with chapters from a variety of SE sites?

I think a variety of sites is more interesting

since most users of Physics.SE already know the best content, but this book will allow them to learn intersting things from a variety of different topics

7:18 AM

Well, personally I don't think I'd be interested in this book either way

But you can ask around

Yeah I'll make a meta post and see if there is any interestr

@DavidZ while the content of user contributions on SE is licensed under CC, the Stack Exchange brand isn't. So before publishing we would definitely need the permission of SE

that is, if we are going to sell it with the SE brand

7:54 AM

If you called it something like "The Stack Exchange Compilation of Best Posts" then yes, you would need the permission of SE (and with that title I'm guessing you would be unlikely to get it). If you called it "Best of Stack Exchange" then it's unclear whether you would need permission, i.e. the mere fact that the book title includes the words "Stack Exchange" probably doesn't necessarily mean you need permission from SE. (But it might.)

Q: The Best of Stack Exchange Book

yeha

I think if the book only consisted of physics posts, I would title the book PHYSICS

or Best of Physics

user228700

It's too hot,
It's too hot in this town.
My will to live is melting
And that's what's got me down.
It's too hot
And my state is on fire.
I'm an endothermic organism
And that's why I perspire
When it's too hot.

user228700

August 1: It's Too Hot

►

Physics Meta

1

As you may be aware, Quora has created a physical book compiling some of the top contributions from a variety of topics. I'm wondering if there would be any interest in publishing a similar hard-copy book compiling the top posts from Physics.SE or perhaps even have the top posts from a variety...

discussion

Not all endothermic organisms perspire ...

user228700

8:09 AM

To be clear, I didn't write that song :-P

user228700

I'm (Yes, me) making lemon rice for lunch todaah, I will post a picture when I finish making it.

Ooh, lemon rice :-)

user228700

Yep. I'm off for about half an hour to make it, toodles!

8:49 AM

This is too early

user228700

9:19 AM

Sheesh, that took much longer than anticipated. Anyway, @JohnR, here:

user228700

user228700

^ Lemon rice and potato "crisps".

Looks yummy.

user228700

It was :-)

I don't see a fork?

or chopsticks

user228700

9:22 AM

Fork?

To eat the rice.

user228700

Typically, we eat rice (and everything else, really) with hand.

Hmm...very traditional :-)

user228700

In case it's gooey and I'm afraid to stain my dress or something, I use a spoon, not a fork. I don't even know how to use chopsticks.

user228700

Hang on, do people really eat rice with chopsticks?!

9:25 AM

Chinese do.

user228700

Holy crap, wow, I see. I wasn't aware that it was even possible to eat rice using chopsticks!

Yup, it's a skill.

user228700

Nice.

user228700

Using a fork to eat rice is simply ludicrous, though.

I do :-/

user228700

9:28 AM

Spoons!

Q: The Best of Stack Exchange Book

That sounds reasonable.

user228700

:-P Try--u'll be able to finish a lot faster.

Yashas Samaga

10:06 AM

2

As you may be aware, Quora has created a physical book compiling some of the top contributions from a variety of topics. I'm wondering if there would be any interest in publishing a similar hard-copy book compiling the top posts from Physics.SE or perhaps even have the top posts from a variety...

discussion

10:29 AM

@Kaumudi.H peanuts?

user228700

Yes, peanuts too :-)

Wasn't that a bit dry just eaten on its own?

user228700

A bit dry, well, yes.

user228700

Tasty all the same!

I would have eaten it with a side dish. Sambar or some other vegetable disk with sauce.

user228700

10:32 AM

Nope, lemon rice is a dry dish, we don't eat it with other curries, that corrupts the richness of the flavor.

Bhavya Sharma

Kidney beans and rice...unbeatable combo..

@JohnRennie Got Led Zeppelin IV yesterday :)

Cool :-) On vinyl?

@JohnRennie Yep :P

I've had it in Flac for ages

Yashas Samaga

You still use vinyl discs? o.0

10:44 AM

Zep 4 is probably the one everyone thinks of as their best album, and I'd go along with that. There isn't a bad track on it.

@JohnRennie Just listened to it end to end, truly a great record

I like III too

and in through the outdoor

They got a bit arty after that. Plant started trying to write deep meaningful lyrics rather than just concentrating on writing good songs.

I'm afraid I struggle to like In Through the Out Door ...

That album is worth it just for Fool in the Rain IMO