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/sci/ - Science, Technology, Engineering, and Mathematics

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New Textbook/Book Request Thread deadbabies ## Mod ## 13/08/25(Sun)06:03 No. 15270 ID: f34135 [Reply] Stickied

File 137740339172.jpg - (401.45KB , 1680x1050 , titanfalsecolor.jpg )

First off, hello there, I'm deadbabies, and I will be taking over as /sci/ moderator. Rules will remain the same. Please use the report function if you see posts that violate the rules, but also do not abuse it.

I have officially expanded the scope of /sci/ a bit. You may discuss Science, Technology, Engineering, and Mathematics here now. No science is discriminated against as long as it's of the peer-reviewed variety. If someone wants to discuss Anthropology or Social Science, by all means, let them. If you do not like it, just don't post in the thread.

The IRC channel #/sci/ is now (finally) re-registered and I am running as operator on here. Feel free to stop by and say hi. I do leave my computer idling on IRC, so check back or leave me a message if you have any ideas, suggestions, or just want to tell me off. You can get onto #/sci/ by joining the server irc.7chan.org at port 6667. You can also use SSL at port 6697 but you will have to set your client to accept invalid certificates.

ADDITIONALLY and IMPORTANTLY I have had several requests on IRC regarding the old Ebook FTP that we used to have. Unfortunately, the mod who ran it entered the military and no longer runs or maintains it. I have no plans to make another one, but if one of you guys would like to, by all means advertise here.

That being said, I'm just going to leave this link here:


You may find what you seek here.

I will be unstickying the old ebook/source articles thread. Please post any new ebooks/source articles here, and feel free to post any working links from the old thread there; I will eventually be deleting it.
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Solutions Manual to E&M, 3rd Edition by Purcell Anonymous 16/11/19(Sat)00:05 No. 16384 ID: 1ae570

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Looking for the the solutions manual to Electricity and Magnetism, 3rd edition by Purcell and Morin. The problems are much more difficult and numerous than in the previous two editions, making it one of the best problem books on the subject. Was able to find the solutions to two analogous books in Classical Mechanics:



Sadly, all my searches for the solutions to the E&M book have been fruitless. It's the last manual that I need to complete my collection.

Anonymous 17/01/16(Mon)06:55 No. 16414 ID: 57a468 [Reply]

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A mental health question for armchair psychiatrists.

Gender dysphoria is a mental health disorder as described in the DSM-5 as someone who identifies as something other than their assigned biological sex. Given that psychiatry still follows the scientific method as to making decisions over what is and isn't a mental disorder. There are still legitimate causes of such individuals.

My question is targeted toward those individuals who somehow manged to turn 'being transgender' into a trend. While they haven't done much to really affect the lives of others unless the lives of others are affected by whining and bitching about their lives on Tumblr without, as they say, checking their privileges. I want to know what a proper diagnosis would be for certain transtrending social justice warriors who encourage violence.

From what I read, gender dysphoria is a fairly weak disorder that most likely isn't the culprit of such extremism. So is it possible that schizophrenia or another such disorder may also be effecting said people? While I do believe a few of them may legitimately be transgender who only seek to find a voice and somehow end up falling into a bad group. There are still a majority of them that make me question their beliefs.

I probably should be asking these questions on a psychiatry forum instead of a chan website, but whatever, I anticipate some negativity.

1 post omitted. Click Reply to view.
Anonymous 17/01/19(Thu)10:53 No. 16423 ID: ef54e2

>There's nothing wrong or correctable with the person's brain chemistry
Citation needed.

>Why would anyone give the tiniest flying fuck if a person with a dick decided to wear dresses and makeup? Or decides to cut off their dick?
So, by the same token, no one should give a fuck if someone cuts their wrists or attempts suicide? Because the only difference between someone who self-harms because of some psychosis or whatever and someone who gets gender reassignment surgery and hormonal treatment because they they have gender disphoria is that the latter is done by doctors. But in both cases the person is irreversibly mutilating their bodies because of a mental issue.

>The real issue here might be that psychatrists are unfounded megalomaniacs who think they can poke around in a person's brain and make things all better, when they still have no idea how the fuck it works on more than a macro level. They're mechanics whacking at an engine with a wrench, when they don't even know how internal combustion functions, and thinking themselves so smart for it.
Yeah, fuck progress! Who cares that the only way to know if a treatment works is by trying it out? Nah, fuck that. We should stop trying to improve things and just settle with our lot. If a better solution existed we would've found it by now, right?

Anonymous 17/01/21(Sat)08:06 No. 16424 ID: 785374

I don't care if someone self-harms, or even self-terminates. There's enough people on this planet, and most of them who will amount to nothing of importance, that we can spare a few of them. Humanity isn't going extinct just because of a few people removing themselves from the gene pool due to genital mutilation or suicide.

That said, I feel the only point of wondering why they do this is for the theoretical knowledge. To help us maybe understand ourselves a little bit. There is no "fixing" of people's minds, generally speaking, especially of something as complex as a social disorder masquerading as a mental one. And I feel it's a bit arrogant to say that some body modifications are okay, like tattoos or piercings, but others are not, just because they are "permanent".

The only reason people get upset about this is because they threaten their own personal definition of what it means to be a man. Like how it is with gays. It's ridiculous and a pointless waste of effort. Live your own life; that's all you can do. The only thing you're going to be able to control is what you do with your own two hands.

Anonymous 17/01/21(Sat)11:51 No. 16425 ID: ef54e2

>There's enough people on this planet, and most of them who will amount to nothing of importance, that we can spare a few of them.
Alright, since you believe that, I assume you'd be willing to do your part and forgo treatment in case of life-threatening trauma or illness.
It's easy to ignore the value of human life when it's not your ass on the line.

>There is no "fixing" of people's minds, generally speaking
Again, citation needed.

>especially of something as complex as a social disorder masquerading as a mental one.
What about this? https://en.wikipedia.org/wiki/Body_integrity_identity_disorder
Would you argue that someone believing that they should be disabled and therefore resorting to amputating their own limbs is also a social disorder?

>And I feel it's a bit arrogant to say that some body modifications are okay, like tattoos or piercings, but others are not, just because they are "permanent".
I wouldn't say "not okay". I'd say "less preferable".
That aside, no. The reason is that a) a piercing does not significantly alter one's biological functions, and b) people who get piercings don't do it to alleviate a mental condition.
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Anonymous 15/07/26(Sun)20:15 No. 16178 ID: c84a9c [Reply]

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i just need to upload this somewhere
that fucking bitch tinypic breaks 8000 wide pics

Anonymous 17/01/18(Wed)18:45 No. 16421 ID: 3bc715

To begin your quest, you must find a little man entitled "Imgur"...

Microsoft Edge Anonymous 16/11/08(Tue)04:49 No. 16376 ID: 57a468 [Reply]

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Serious opinions about this new browser?

And I want honest opinions and not those entirely based upon the fact that a past iteration of the engine was not good. Like all things, they can improve or get worse.

Anonymous 16/12/15(Thu)13:00 No. 16399 ID: 75c683

It's garbage.

Anonymous 17/01/18(Wed)18:33 No. 16420 ID: 3bc715

It's trying entirely way too hard to be 'good', also it spawned an endless cascade of edge jokes, and I am not fine with that.

SSID ideas BillyJoeThePianoMan!!HjBTVkMQpk 15/09/29(Tue)00:57 No. 16202 ID: 8aea60 [Reply]

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/sci/ give me some "edgy" SSID ideas, I can have up to four or five on my WRT54Gv5 with DD-WRT. I also figured out I can up the power to about 1.6 watts, but cannot get the -o command to turn on "override" where you can set basically any Tx power. Also I can use channel 12 13 and 14 freely :)

Other than SSID ideas that are "edgy" can you think of any illegal (in the US in general or wherever) SSIDs? Just for lulz.

4 posts omitted. Click Reply to view.
Anonymous 16/03/22(Tue)05:22 No. 16305 ID: a76768


Anonymous 16/11/03(Thu)04:06 No. 16375 ID: c58625

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the social security numbers of your enemies.

Anonymous 17/01/18(Wed)17:47 No. 16419 ID: 3bc715

Try "OsamaIsKing" or "DatKiddieArse"
Pretty edgy if you ask me.

Storage madness Anonymous 16/08/31(Wed)10:13 No. 16356 ID: f62a88 [Reply]

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Basically, my file/folder organization is pretty non-existent. EG: pictures folder has like 5 subfolders that make no fucking sense.

TL:DR how do you sort out your shit?
and are many fucks given about filenames

5 posts and 1 image omitted. Click Reply to view.
Anonymous 16/12/12(Mon)07:42 No. 16398 ID: ef54e2

It's me again. I finally set aside some time to look at Hydrus. While its features definitely appeal to me, this is a deal-breaker:
My collection consists not of gigabytes, but of terabytes of files. Literally millions of files in a ZFS array. I simply cannot afford an import operation that performs a full file copy.

Anonymous 17/01/15(Sun)07:04 No. 16411 ID: 4c82ad


I am also tossing my hat in as a guy who had this idea independently. Mine is probably going to be written using the sfml library in c++ though. I guess a lot of us have similar issues :)

Anonymous 17/01/15(Sun)11:04 No. 16412 ID: ef54e2

Hey, I'm ef54e2.

Would you be interested in working as a team on this? I already have a fully functional viewer and a PoC client/browser for the database, and a server. You can browse a virtual directory structure and open files with the image viewer. The server sends the file contents to the viewer through a socket (entire file resides in the client's memory; streaming is WIP) using a custom protocol.

You can take a look at the viewer code: https://github.com/Helios-vmg/Borderless
The server and browser code is private for now, but I'd be willing to share it with someone interested in working on it, of course. The client and server are written in C# (the server binary can run unmodified on both Windows and Linux) and the database is PostgreSQL.

Let me know, man. I really want to get this done, but my time is divided between my day job, real life, and other projects, so I can never find the time to work on this.

Earth Hole Anonymous 17/01/05(Thu)16:26 No. 16406 ID: 4318e8 [Reply]

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Hello /sci/. If there was a giant hole in the earth leading from one end to the other and- if you jumped in- would you just be pulled to the other side, or just be trapped in the middle by gravity?
>Pic unrelated

Anonymous 17/01/05(Thu)18:53 No. 16407 ID: 8b2816

Ignoring effects of air resistance, you would experience pendular motion. That is, you would reach approximately the same distance from the center on the other side. "Approximately" because the Earth is not uniformly dense.

If you were to brake yourself and stop at the center you'd become trapped. Not because the center is pulling you towards it, but because all the atoms of the Earth are simultaneously pulling you away from the center in all directions.

Another interesting aspect is that as you get closer to the center you'll experience an increasingly weaker acceleration from gravity, because there's less planet under you to pull you down.

Anonymous 17/01/09(Mon)15:12 No. 16409 ID: 4318e8


Anonymous 17/01/15(Sun)07:00 No. 16410 ID: 4c82ad

Gravity is actually the force of all bodies in the universe pulling on all other bodies in the universe. However, the strength of the pull weakens with the square of the distance between two given bodies. Since the celestial bodies in the universe are so far apart, you can say for conveniences sake that you are only under the effect of the gravity of the nearest one (the earth).; in reality though, you are even (very, very weakly) being pulled towards other people, which means that the "your momma" joke about her having a gravitational pull is technically true.

start learning about computers Bigattao 16/03/10(Thu)06:19 No. 16297 ID: 00af9a [Reply]

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Hi sci,
I'm a noob about computers and going to do college of Computer Engineering. I don't know even how to start learning. Can somebody give a tip?

9 posts and 2 images omitted. Click Reply to view.
Americium 16/12/09(Fri)01:51 No. 16397 ID: ed8b6e

Here you go:


Arduino is a great place to start! Anonymous 16/12/30(Fri)09:26 No. 16404 ID: 01d2f8

Code academy and cybrary are pretty helpful sites but I really learned a lot building and programming little projects with the arduino mega2560. Jeremy Blum has some great tutorials on you tube to get you started. Also building raspberry pi projects is a great way to get your feet wet. Best of luck to you.

Nooby Anon 17/01/07(Sat)07:51 No. 16408 ID: 122f98

Also use Udemy if you have a little bit of money their courses are very informative and useful. Also very good for Python beginner courses.

Good luck bro

replacing speaker with 1/4" jack chrissychris 16/12/19(Mon)21:09 No. 16401 ID: 8ed2cc [Reply]

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Alrighty, I am looking for some help.

For the sake of experimentation and fun, I'd like to replace the speaker of a shitty kids toy (very similar to the one in the pic) with a 1/4" audio jack so it can play through a larger amp, possibly even through guitar effect pedals.

I've already tried this twice. Taken apart the toy, soldered in a 1/4" jack, and plugged it in. Both times I ended up with a reallyyyy spotty and quiet sound. At first I thought it may be a bad soldering job, but now I feel like it could be due to the low power of the toy, it takes 3 AA batteries.

So what's the deal here? Any ideas what could be wrong?

Anonymous 17/01/01(Sun)23:02 No. 16405 ID: 67f38c

It has nothing to do with the electrical power. Real electric guitars don't have any batteries. The issue could be that the amp is designed to work with the signals from a guitar's pickup, which are probably not the same as the signals from a speaker. If I had to guess, the pickup would be taking the signals from each string individually, while the speaker from this kid's toy is taking the entire sound as a whole.

It's also possible that the teeny-tiny magnet in that speaker just isn't strong enough to send a strong signal. I'm not sure what you could do about this.

Cool little Simulator CometCrazy 16/12/27(Tue)01:31 No. 16402 ID: ec6349 [Reply]

File 148279866422.jpg - (45.39KB , 1271x601 , CometCrazy.jpg )

Check out this cool simulator

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