The h Bar - 2017-02-26 (page 3 of 5)

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5:00 PM

There might have been flags before that too

Or maybe not

I don't know :/

83

Q: How was this answer posted after this question was closed?

Question: lot of .exe folders are created on my windows7 Answer: try that... The question was closed at 11:57:57 (according to the hover-over-"x-mins-ago" bar) and the answer was posted at 12:16:35. It's a fairly lengthy answer, so it's possible that it was started to be written before it was c...

bug status-bydesign answers closed-questions

It has the "status-bydesign" tag :O

However, this is only a client-side restriction, so it is possible in some cases that this process fails.

For users answering from a mobile device, there's no client-side restriction in place to begin with, so this situation is presumably even easier to create when using the mobile version of the site.

(Maybe they answered using the mobile app and started writing it before getting duped)

@DanielSank sorry was afk, and I don't remember but I did beat it several times.

Daniel Son; Necklace Don

Daniel Son; Necklace Don is a mixtape by American rapper 2 Chainz. It was released on August 5, 2016 independently by 2 Chainz. The project consists of ten tracks, with guest appearances from Drake and YFN Lucci, with production from TM88, C4, Dun Deal, DJ Spinz, Bobby Kritical, K Swisha, Mr. 2-17, Southside, and Buddah Bless. == Critical reception == Daniel Son; Necklace Don received mixed reviews, with XXL Magazine giving the mixtape a 3 out of 5 stars. == Track listing == == References == == External links == Official download on DatPiff...

@DanielSank ^reminds me of you

@JohnRennie Has there ever been a time when you hit the 200 max reputation limit in a day without answering any question?

5:09 PM

No, or at least I don't think so.

I get a steady trickle of upvotes from old answers but I'd guess it averages out at 3-5 upvotes a day. Far short of the limit anyway.

As the number of questions a person has answered well increases, there might be a point where the answerer earns the reputation for doing nothing. People might bump into one of the answer and upvote it.

So the people with high reputation and a lot of answers will become more richer (reputation-wise)?

lol

Kind of like real life then :-)

yea :D

In a way I would prefer it if reputation decayed exponentially.

2

That way your rep would be a good guide to your current prowess. As it is you get people with massive reps who just live of past glories - a bit like me :-)

So this is a flaw in the SE system.

5:13 PM

@JohnRennie wat? Why?

My ability to use my site privileges for awesome doesn't decay exponentially does it?

@JohnRennie Uh, it at least already gets exponentially more useless the more you have :P

I mean, maybe it does...

What kind of time constant do you have in mind?

@DanielSank half life of a year.

@ACuriousMind Yeah, which is probably good.

@JohnRennie Hmm, you know... perhaps having both numbers would be interesting.

@DanielSank Yep, it's not a bad thing

5:15 PM

It would take some thinking through. Ideally the privileges you get wouldn't change and you wouldn't lose the upvotes. It's just that the rep from each vote decays with time.

@YashasSamaga I'm not really sure why this is a flaw: People who produce a lot of good content get a lot of rep - where's the flaw?

JD gets a lot of good rep

There are several flaws with the rep system in my view, but that you can get rep from old posts is not one of them

@ACuriousMind If a time comes when you get 200 rep daily just becaz of the old answers, then that would discourage the user from making new posts. As more people enter that group, the new users will find it extremely difficult to compete.

Look what I've just found at the bottom of a drawer:

5:19 PM

I believe that if an answer has 50 upvotes, at least 10 of them are from people who never read the answer.

It is just a belief which could be wrong.

@YashasSamaga The top SO users are exactly in that situation, yet SO does not appear to be stagnating.

After reading a research paper on herd-like behaviour of humans, I have started speculating too much I think :p

user image

2

Maybe the problem is that you think Stack exchange is a competition

Me in 1985 in my motorbiking days. I think that was in the Alps somewhere.

5:21 PM

Jon Skeet gets 200 rep a day, every day, and is still writing new answers. If you have posted so much that you get 200 rep on old posts alone, I think it is evident you're not actually doing it for the points.

SO is ruled by Jhon, PSE is also ruled by a John :D

@JohnRennie is...is that you?

I was wondering the same

You think that's bad, look at this one!

What on earth is a "Furener Knupp"?

@JohnRennie It's not bad, it is...authentic. That's pretty much how I imagined you when you said you rode motorcycles :P

5:24 PM

user image

2

@JohnRennie is your profile pic photoshopped?

Who is that young git? !!!

or do you really have that awesome beard?

@YashasSamaga no the profile picture really is me, though that was 20 years ago and I've shaved the beard off since.

aw you look handsom with the beard

I am not saying that you look ugly without the beard

5:26 PM

lmao

user image

And just to prove that motorbikes really were involved :-)
Mercifully the picture is too low resolution to show me in any detail.

@ACuriousMind I think it's good to require some level of content creation as prerequisite to privileges, but after a point rep is just a measure of how much time a good user spends on the site.

What on earth does this mean "Can we fully describe a sine wave as a form of uniform increase in acceleration?"?

Well no

@JohnRennie Ah!!! You look really nerdy (and a bit stylish :P) in that picture :D

@JohnRennie This is cute :P

5:38 PM

Only my mother thinks I'm cute :-)

I'm not your mother and still feel that you are a cute old gentleman :D @JohnRennie BTW I guess it is time for a new profile picture now :)

@JohnRennie With all this handsomeness, how did you manage to stay unmarried?

@JohnRennie Great scenery there :)

@YashasSamaga Na na...I am sure he had multiple girlfriends :D

Being a bachelor was a choice :D

Aha! That's the reason.

xD

@2017 It was on the Luxembourg Germany border.

5:47 PM

@JohnRennie what about your so?

somebody posted a pic awhile back of fonda or hopper in this movie, easy rider, cant find it again. has anyone seen it? legendary in US. imdb.com/title/tt0064276

0

Q: Potential wells in nanostructures

When do finite potential wells form and when do infinite potential wells form?

quantum-mechanics potential nanoscience

opinions?

because I can't even

I actually flagged it for close

easy rider movie seems like it might have been loosely inspired by this legendary book also semifamous, on the road by kerouac en.wikipedia.org/wiki/On_the_Road

the question appears as if the author did not show any research effort

5:55 PM

@YashasSamaga for which reason, though?

it also looks like a homework question

but I think I am going over the line here by flagging too many questions as homework questions

@EmilioPisanty sup?

@DanielSank nothing much, leaving in a bit

just came online to buy my Rogue One tickets, and I'm off to see it in a min

so there

see y'all after some starwars

Eh, Rogue One still running in theaters ?

Wasn't it released in 2016 ?

You watch movies? :o

6:03 PM

Obvio

you don't?

hello

@DanielSank article class? twocolumn? okay

oh, and the sectioning link, okay

@YashasSamaga Is there any equation that relates base current to collector current in transistors ?

yes

Ib/Ic = alpha

@2017 Second run theater and uneeded screeds a huge multiplexes in small towns will keep running the blockbusters long after most places have moved on.

Given that I know the percentage of electrons injected into base region that passes into collector

6:12 PM

You should be given alpha and beta.

As long as there are enough fan-kids and grumpy old people who didn't want to pay $20 but did actually want to see it, it'll stay on the screen in the smaller projection rooms.

@YashasSamaga Alpha and beta is not given. I need to derive it I guess. Wait I'm showing you the question.

?

alpha and beta are constants for a given transistor

@dmckee Oh, never heard of such theaters !

yea just post the whole question

6:15 PM

@2017 They aren't as common these days as they used to be, but most regions have one or two. Seats can be $5 or even $3 for the matinee (out in fly-over country where I live, anyway).

Minimal staffing and limited refreshment, relatively plain seating.

And they get the rights to run the film cheep because the studios can't sell them to the big boys anymore.

In an npn power transistor the collector current is 20 mA. If 98 % of electrons injected into base region reach the collector, then what is the base current? I think the 98% will help in finding alpha and beta

@YashasSamaga

But that means they don't get the film for a month or more after its release.

@dmckee Good way to earn for small theaters :)

Nice

@YashasSamaga α (Alpha), the factor by which emitter current is multiplied to yield collector current, can be calculated in two ways.

I am confused between alpha and beta

not sure which one is which

leme check

Me too

I'm checking

Ic/Ib

6:18 PM

Ic/Ib is beta lol

Yep

so beta is 0.98

These formulae are hard to remember :P

Yep, then toh it is done

base for beta :)

I need to revise semiconductors!!!

6:19 PM

anyway

the question you posted is just stupid

you have 20mA current in the collector

98% of the base current = collect current

this is a 6th grade school problem ,=,

Yeah, it is stupid and so am I (sometimes) :P

have you ever used transistors?

I have made a 4 bit adder once :D

I had also made a two register 4bit computer in minecraft

@YashasSamaga I am using transistors even while typing this sentence. LOL :'D

-_____________________________-

My CPU has too many :P

6:23 PM

@YashasSamaga If you've played the online game agario, it's almost the same situation. In this game, you have to eat others and get big.

you obviously know what "used" in that context meant

But once you hit a certain mass threshold, your mass starts decaying. The bigger you are the faster your mass decays.

I have played agario :D

I form teams :D

I never betray anyone but some people betray me :'(

Remember the Trump skin (agario) in the election days? :)

I haven't played agario for a long time

6:28 PM

It's especially similar to the SE rep system because of those tiny masses floating around: the bigger you are, the more mass you absorb from them *for free*.
It's equivalent to the reps coming from the old posts; which is more for the *bigger* users.

Therefore it is absolutely necessary to have some kind of decay if you want to have a fair competition (not sure if this is what you're looking for at SE).

@YashasSamaga Hmm, I think beta should be 0.02 as 98 percent base electrons flow into collector leaving behind 2 percent in base...

omg

I made a mistake even in that simple thing

Ib/Ic=0.02 and not 0.98

yea

wait what?

See, overconfidence kills ;)

6:30 PM

alpha is Ic/Ib

I checked the answer

Ic is common for both formulae and is at the toop

It is 0.02

@JohnRennie wow you looked so... geeky back in 1985 :O

G*d*****t, film's dubbed in Spanish

And Spain Spanish at that

Hell no

6:31 PM

Yeah, beta is reciprocal of Ib/Ic

@EmilioPisanty, what film?

@2017 what the hell

base current is always very tiny

$\frac{2}{100}(20 mA)$

98% of base current goes to collector

wth

that question is non-sense

oh nvm

Hypothetical

6:33 PM

nah it is correct

it says 98% of the base current reaches the collector

Yeah, that's what I am saying

it did not tell collector current is 98% of the base current

Yeah, 2 percent of total is base current

If Ib=2 units then Ic=98 units

$\beta= Ic/Ib=\frac{98}{2}$

@YashasSamaga Form teams in team mode or FFA (individual) mode?

FFA mode

people make teams in FFA mode

lol

6:36 PM

that's not really fair

Ic is NOT 98 units

@2017

If Ib = 2

then Ic is 98 + emitter current

you are getting confused

Firstly, the base current has to be tiny. Base current cannot be 98% of the collect current.

That is ridiculous.

Base current is 2 units..

Secondly, the question said 98% of the base current goes to collector.

How does emitter current come into play? You don't even know alpha!

It did not say98% of the base current "IS" the collector current.

21 mins ago, by 2017

In an npn power transistor the collector current is 20 mA. If 98 % of electrons injected into base region reach the collector, then what is the base current? I think the 98% will help in finding alpha and beta

There is a big difference between telling "98% of X goes to Y" and "98% of X is Y"

Ok, that question looks unsolvable now.

6:38 PM

I said that suppose there are 100 units of current entering. Then 98 units goes in collector and 2 units is in base.

pff

the question is wrong

@YashasSamaga why?

If 100 units enters base, 98 of them go to the collector.

and what you said is right

but

98 units is NOT collector current

if you are writing a paper by yourself, should you still use "we" in the abstract? it sounds awkward (to me) to say "I show" instead of "We show".

98% of the base current goes to collector but 98% of base current is not the collector current

6:40 PM

user image

@heather you are writing a research paper while you are in 8th grade?

@2017 That diagram makes absolutely no sense with your question.

wrong configuration

@YashasSamaga How?

@YashasSamaga it's not really a research paper

@2017 oh nvm

Hi, heather.

6:41 PM

i'm just doing it for practice with the format

@DanielSank, hello =)

About sectioning: the usual way of doing it with \section, \subsection etc. works fine until you start wanting to reuse document fragments.

When you get to that point, if ever, then the thing in my blog is relevant.

Until then you can ignore it.

yes, I read through your blog post.

oh ok

@YashasSamaga What is collector current according to you? I think my analysis is correct.

i think this paper is short enough and unimportant enough I don't need to do that, but I will certainly keep it in mind - I've bookmarked it =)

6:42 PM

In any case, I definitely recommend breaking all TeX projects into smallish bits, i.e. one file for each section or something.

Makes editing a lot easier.

Another suggestion I wish I'd had:

@2017 Collector current is the current flowing through the collector.

Within each document, choose some kind of name prefix for named figures and equations and use it consistently.

@YashasSamaga I'm asking for value.

@Mostafa have you worked with transistors?

@DanielSank what do you mean?

(by name prefix)

6:43 PM

That way, if you ever need to cross refer to equations later when re-using document fragments, you avoid name collisions.

In TeX you can label equations:

\begin{equation}
g(x) = \int f(x) \, dx \label{my_equation}
\end{equation}

well that's cool!

zomg yes it's essential.

Then later in your document you say From Eq.\,(\ref{my_equation}) we can see that....

Yeah, you need dis.

@DanielSank Doesn't the label go after the "begin"?

@ACuriousMind It really doesn't matter.

@YashasSamaga Remember that the base emitter junction if forward biased. Electrons injected into base won't cross over to that as easily as it will cross over to collector.

6:45 PM

I've been taught to label enviroments directly after opening them, I think there are some weird cases where it breaks otherwise

@heather, in multiline equation arrays you can label individual lines:

That isn't the point. @2017

@YashasSamaga Then what is?

The question said 98% of the base current goes to the collector.

It did not tell 98% of the base current is equal to the collector.

but you considered Ic = 0.98Ib

\begin{align*}
g(x)
&= 5x + x \\
&= 6x \label{second_line}
\end{align*}

6:46 PM

@DanielSank @heather meh

the base region is very thin is super lightly doped @2017

I mean, it's nice

@EmilioPisanty Meh yourslef.

Bit nowhere near crucial

@EmilioPisanty How can you TeX without it?

Anyway, heather, after generating a lot of TeX, i started wanting to include some bits in more than one larger project.

6:47 PM

@DanielSank by being mildly careful when I reuse TeX from some other document

@YashasSamaga A small change in base current causes a huge change in collector current. You can say that collector current value is governed by base current value. That is the mechanism used in amplifiers. So approximately my calc is good enough.

So now what happens if I have my_equation in more than one included document? Answer: I'm fukt.

@EmilioPisanty How do you even ref within one document without using label and ref?

@2017 facepalm

I really don't know what to say any more.

@DanielSank oh, that, yes

You manually put equations numbers in? That's like hard-coding memory addresses in computer code. Forget it. No.

6:48 PM

But document-specific label prefixes?

@EmilioPisanty Yes, for exactly the same reason people do that in C libraries.

It's not elegant but it's the best available options and it's 100% time tested.

If there's one thing this exercise is teaching me, it's that I can write a terrible abstract.

=P

@heather heheh

@EmilioPisanty It's not necessary until it is.

and then you really wish you'd done it.

@YashasSamaga It will be better if you state facts rather than emotions.

"So approximately my calc is good enough"

6:50 PM

@2017 Is that a fact or an emotion? :P

I get annoyed at the authors of papers for using obscure, strange, archaic language, and now I'm doing it, lol.

@2017 It is not an approximate.

I just came out of a 240 page document that reused code from six different papers and survived without it

@2017 Error of 5,000% or more is not approximate

@ACuriousMind Both.

6:51 PM

Labels had prefixes on a per-chapter basis

@ACuriousMind can you answer this?

35 mins ago, by 2017

In an npn power transistor the collector current is 20 mA. If 98 % of electrons injected into base region reach the collector, then what is the base current? I think the 98% will help in finding alpha and beta

@YashasSamaga What?

Ah

@YashasSamaga You're asking a mathematician about transistors ;-)

4

That is rather amusing.

But giving labels on a per-paper basis would just have been more noise and red tape

@DanielSank that

6:52 PM

@DanielSank aren't transistors a part of the high school syllabus?

@EmilioPisanty Tell that to every C programmer ever.

I vaguely know how a transistor works, but that's it, certainly couldn't calculate anything for it

@YashasSamaga Heh, not in the USA anyway.

:|

@DanielSank well, tex is not C

6:52 PM

not even in 12th grade?

@YashasSamaga Hmm, unless you point out the mistake then it is no use talking to you. Phew. in this way you are blocking yourself to suggestions and I am wasting my time.

@EmilioPisanty It's similar in how multi-document projects work.

@YashasSamaga No.

@2017 I already told the mistake. 98% of the base current goes into the collector but 98% of the base current is NOT the collector.

@DanielSank oh, I forgot to tell you: my highschool offers a digital electronics class! =D

@YashasSamaga Why?

6:53 PM

@heather Excellent. Do it.

needless to say, I'm going to take it.

Don't skimp on analog electronics too, if you can help it.

You need both to become a true wizard.

@2017 Firstly, the base current has to be tiny. Base current cannot be 98% of the collect current.
That is ridiculous.

i will try not to skimp =)

@EmilioPisanty Well...both are probably Turing-complete, though ;)

6:54 PM

@2017 Secondly, the question said 98% of the base current goes to collector.

@DanielSank yeah, but when Heather gets to concurrent-multi-document peirce she can start worrying about that

@EmilioPisanty Yes, and if she's like me, she'll get there after having generated a ton of content, and have to go back through all of it and fix the labels.

@YashasSamaga BASE CURRENT ISN'T 98 PERCENT OF COLLECTOR CURRENT! PLEASE READ THE QUESTION.

omg

THat is exactly what I was telling lol

In the meantime, there's plenty of more important good TeXing practices to learn, I'd say

6:55 PM

@EmilioPisanty at first I misread that as TeXting

@DanielSank nothing search and replace wasn't designed to fix

@EmilioPisanty Perhaps.

17 mins ago, by 2017

I said that suppose there are 100 units of current entering. Then 98 units goes in collector and 2 units is in base.

you said it other way round earlier

oh wait wrong msg

@YashasSamaga 2 units isn't 98 percent

@YashasSamaga Earlier might have been a mistake. Let it go.

<3 LaTeX

6:57 PM

@heather it's the best we have. It's really outdated though.

@YashasSamaga Yes. Had 4 electronics courses (ElectronicsI & II & III + RF electronics ...but 3~4 years ago

@DanielSank how is it outdated?

@Mostafa solve this

41 mins ago, by 2017

In an npn power transistor the collector current is 20 mA. If 98 % of electrons injected into base region reach the collector, then what is the base current? I think the 98% will help in finding alpha and beta

Who remembers stuff from 3-4 years ago?

LOL XD

i mean, admittedly, I can waste hours just making a table or a simple TikZ diagram, but depending on how you look at it, those are features, not problems

6:59 PM

@heather The compiler error messages are completely worthless. There's no namespacing for labels etc., the build system involves you running the same executables several times in the right order, and other such nonsense.

@2017 nobody forgets the basics -,-

@YashasSamaga I don't agree. You need revision from time to time.

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