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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
15270

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:

http://ebookee.org/index.php?tag=7

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.
Message too long. Click here to view the full text.


11 posts and 2 images omitted. Click Reply to view.
>>
deadbabies 15/12/09(Wed)07:14 No. 16262 ID: 533275

> anyone have "a first course of quality engineering" to download?

I looked quite hard and cohld not find it. Sorry. :(

By the way, if anyone wants access to my ebook collection, which is mostly fiction but there are some ood nonfiction books as well, depending on your interest, please come on IRC and get a hold of me (irc.7chan.org or bobba.7chan.org seem to work pretty well) and contact me (deadbabies.) I can usually be found on #channel7 and #7chan among other places.
l have over 10000 books in my calibre library. :3




Machine learning for gaming AI? Anonymous 16/02/10(Wed)13:52 No. 16279 ID: 716d81 [Reply]
16279

File 145510874991.jpg - (8.05KB , 200x200 , Cale-AI.jpg )

Hello /sci/!

Let's say that I want to create an AI for a simple board game, maybe chinese checkers. So I record multiple games with 2 to 6 players.

So can anyone please tell me if there's
some program that can simply read the database and construct a gaming AI from it?


>>
Anonymous 16/02/10(Wed)14:29 No. 16280 ID: e402bb

That's not AI, it would only be able to perform the observed actions or act psuedo-randomly. AI would require it to be able to plan and execute strategies independently.


>>
Anonymous 16/02/10(Wed)16:36 No. 16281 ID: 716d81

>>16280
Is there any AI used in gaming?




Anti-Aging Anonymous 14/07/31(Thu)06:00 No. 15779 ID: 800849 [Reply]
15779

File 140677920234.jpg - (370.63KB , 850x565 , iStock_000010280186Small.jpg )

Can we get a thread on anti-aging and lengthening lifespans?

Any possibilities, and problems with those possibilities. And ways to get around said problems. And more problems. And repeat. Until we get to even a slightly plausible solution.

Then, maybe somebody like Qin Shi Huang will say, "Hey, maybe if we try to make this better, it will work in a few thousand years!"

First time on /sci/, so bear with me.
Anyway's, lets go?


23 posts and 2 images omitted. Click Reply to view.
>>
Anonymous 15/09/07(Mon)00:17 No. 16189 ID: c2c43a

>>15844
Okay, so cells that can replentish their own telomeres is a problem.
Is there a way to utilize viruses as a method of introducing a set number of new telomeres to cells? If someone had weekly injections of telomere transporters that affected, say, 10M random cells in the body, then wouldn't this avoid the cancer hell path and still give the genome some padding for splits?


>>
Nazi Icktor 15/12/08(Tue)04:06 No. 16261 ID: 6db675

>>15779
It can not be done without good belief in Jesus Christ. Certainly be a Christian if you want to live a long life.


>>
Lengthened Lifespan Artemis 16/02/09(Tue)18:28 No. 16278 ID: fd4497

The trick to lengthening human lifespan lies within the active regeneration chemical that lies within blood.

The younger the person, the more of the chemical exists within the person.

Currently, the only way to gain access to this chemical's beneficial properties in order to apply it's use to lengthen lifespans is to receive repeated blood transfusions from someone 10 or over years younger than the subject that has a compatible blood type.

Of course this is subject to the chance of rejection.

Other than this, research is currently underway to try to recreate this chemical in a lab environment.

If this is not possible, blood transfusions may be the only way.

Of course this explains the myth of vampires, so enjoy this new knowledge that has in fact been kept secret for a long long time.




Homosexuality, could it be an anomaly in brain developement? Dr. Nick Riviera 15/02/05(Thu)04:59 No. 16039 ID: 8ec688 [Reply]
16039

File 14231087868.png - (64.35KB , 320x307 , Dr__Riviera.png )

Hi guys, to begin I just want to make a couple of things clear.

- This thread is NOT about discrimination of homosexuals.
- This thread is NOT about considering homosexuality as disease.
- This thread is for pure scientific discussion.

Well, let me begin by telling you that I'm a med student and a embriology assistant at my university and I'm not a native english speaker, so you may encounter some grammatical errors in the text, but you'll get the point.
This whole dilemma began two weeks ago, when my brother told my family that he is gay. It was quite a shock, not because of the fact of him being gay but because he doesn't fit the gay man stereotype. He's a big dude, loves sports, bearded, the true definition of what some call "manly man". We accepted him, of course, and I have to say I've never seen him happier.
But after a few days I began to think, was he always gay? Did he decided to be gay? Why now? These questions started lingering in my mind. So I went to talk with my him about it.
He told me that he always has been, for as long as he remembers. Nothing has changed about him, except for his sexuality (for us, not for him haha). So that got me even MORE questions. Why are some gay men that are like extremely feminine? Why are some gay women extremely masculine? Why are gay guys like my brother who don't appear to be gay? Why do some gay people feel like they are traped inside the other genders body and need to get medical treatment (sex change surgery, hormone therapy) and why others don't?And why are there women like that too? Why many species, whose main goal is to survive (actually this is every species main goal, it's literally in our DNA), has certain individuals who are the contrary to this?
So I decided to tackle all these matters from a scientific point of view? What if during the development of the lymbic system (the part of the brain which controles emotions, memory, sexual desire, etc.) something doesn't go as it should?
So after I thought of this I told myself I couldn't be the first one to ask myself these questions. And of course I wasn't in a world with 7 billion people so thanks to the magical power of the internet I managed to get a cool text about the subject. I took some paragraphs which I thought were the most interesting, still I'm leaving the link (please don't take the text as discriminatory, it's merely scientific, it refers to homosexuality as an anomaly in brain developement because seen from a medical point of view it is, still doesn't mean it's moraly wrong).

"..the body and the brain first become sexually differentiated at about the third fetal month. Prior to this age, although genetically male or female, the fetus is physically/sexually-neutral. With the formation of the testes, and the secretion of testicular androgen, target ti Message too long. Click here to view the full text.


20 posts and 1 image omitted. Click Reply to view.
>>
¬†Rembrandt 16/01/24(Sun)22:43 No. 16274 ID: af6485

Thus, we have to ask ourselves, "Are gay men effeminate because they are effeminate, or are they effeminate because we notice and remember every single case of gay men being effeminate?"

The answer is probably some of both. "Stereotypes exist for a reason" is an incredibly true statement, if for no other reason than "someone is propagandizing a stereotype" (see: WWII & the Holocaust).

All that being said, the short answer to a lot of the questions people ask about sexuality is: "Its complicated" because it is. To rapidfire answer some faqs, though:

>Is being gay genetic or learned
Almost entirely genetic, bisexuality can somewhat be "learned"
>Can you be a masculine gay man or an effeminate gay woman?
Absolutely
>Can you be a gay transexual?
100%
>Is being transexual genetic or learned
As with homosexuality, it is roughly 100% genetic
>Is there a scientific correlation between homosexuality and masculinity/effeminacy for a specific gender?
Message too long. Click here to view the full text.


>>
¬†Rembrandt 16/01/24(Sun)22:52 No. 16275 ID: af6485

In my second post:
>culture affects, and is affect by culture
was supposed to read
>culture affects, and is affected by perception

It was also greentexted there.


>>
Anonymous 16/01/27(Wed)06:48 No. 16276 ID: b41207

>>16275
You make some very good points. I do not have a great understanding of anatomy or biology as a whole, but I have always believed that the reasons behind a person's personality was genetic (to a point) or atleast heavily affected by it. As you said, society also plays a role in the perception or movement on these actions relating to personality. If you are conditioned by the people and ideals around you to be something else, then you most likely are going to become that. Also pertaining to the environment around someone, and how it effects them: if a gay man for instance was only in contact or even only knew of women (besides himself), then this man would have little idea that he was gay. Perhaps he would not feel whole, or a little voice in the back of his head wanting something different, but the idea of wanting someone different would be little existent. I ocassionaly see posts on other imageboards following the idea "the internet made me gay". Perhaps these people always considered themselves straight (as heterosexual is the norm) and never saw gay porn because the mentality " I'm straight not gay, I don't watch gay porn", and once being exposed, they realised these suppresed or blinded tendencies.




Beginners questions about relays and what not Anonymous 16/01/22(Fri)20:33 No. 16271 ID: 2ff71e [Reply]
16271

File 14534912089.jpg - (154.50KB , 291x640 , relay.jpg )

I'm currently building a switch cabinet or whatever it's called, its supposed to operate a servo motor and an asynchron motor. One of the tasks is to use a relay for the emergency stop, and it's supposed to be wired so that the ES has an NO and an NC switch. When ES is pushed, the relay will lose contact with the contactors. I kinda get that part, but why not just have two NC switches hooked up to the contactors? What exactly is the point of messing around with the relay?

Also, if i could get a quick word on how the wiring described on this relay (Jokab rt9) works, i'd be more than thankful. I assume i just hook it up the way it's described, but i don't fully understand the logic behind it. Seems more reasonable to me to just go with 2 NC switches and skip the relay altogether.




sadness Anonymous 15/12/31(Thu)13:54 No. 16268 ID: 4ba928 [Reply]
16268

File 145156648466.jpg - (268.59KB , 1414x1414 , brain1.jpg )

i know it's more complicated than this, but basically: what are the primary neurotransmitters and chemicals etc that cause "sadness" and how does that work? are the triggers for sadness learned and based on memories/etc and behavior stuff or..?


>>
Anonymous 16/01/06(Wed)14:45 No. 16269 ID: aeacb3

From what I understand, sadness is not caused by a hormone in the body, it's caused by a lack of them (serotonin, dopamine, norepinephrine).


>>
Anonymous 16/01/06(Wed)14:49 No. 16270 ID: aeacb3

>>16269
Triggers for sadness can be learned (e.g. finding out your favorite football team lost) or it can be instinctive (e.g. finding out someone close to you died).




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

File 144348106459.jpg - (68.15KB , 1000x845 , greenlexluthor.jpg )

/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.


>>
Anonymous 15/09/29(Tue)03:09 No. 16203 ID: e520ce

put some emjois up in there


>>
Anonymous 15/10/02(Fri)23:53 No. 16204 ID: ef7945

Where do you live, your SSID is not nearly as important as the ability to track you down is.


>>
Anonymous 15/12/19(Sat)05:42 No. 16264 ID: b41207

>>16202
threatening politcal or goverment people is illegal
>"ima blow up obama"




Anonymous 15/10/03(Sat)18:24 No. 16205 ID: cd3867 [Reply]
16205

File 144388947844.jpg - (92.78KB , 950x534 , ljud.jpg )

This might seem like an idiotic question, but i'd like to find out the science behind sounds and what not. Such as in music.
For example, if a catchy tune could be broken down into numbers, i would like to know how.
I also know that if it was that easy, people would already be doing it.

To be perfectly honest, i know nothing about the subject, but i have to start somewhere.
So my very first step is asking you guys.
I will learn more in time of course. This was just the first place i thought of asking, because i assume you won't get angry at me.


7 posts omitted. Click Reply to view.
>>
Anonymous 15/11/21(Sat)08:53 No. 16249 ID: 6a8cdf

>>16210
hmm.
good questions. well, when something is distorted, for this example we'll use a distortion effect on an electric guitar or something, the effect adds harmonic and inharmonic overtones or partials [so, more frequencies, more complexity to the actual sound wave] to the signal, and may alter the main harmonics, which creates a different timbre [or.. texture, sort of how it sounds].

urm..
OH, got it. check this out --> https://www.coursera.org/course/digitalsounddesign

take that course, it'll teach you a lot.

look into acoustics if you wanna know about sound waves and how they work and how they bounce around.

look into human psychology, auditory processing, and psychoacoustics if you wanna know about how sound works with our brains and why we like certain sounds and dislike other sounds.

look into sound design if you wanna learn how to create sounds yourself.

Message too long. Click here to view the full text.


>>
Anonymous 15/12/06(Sun)07:54 No. 16252 ID: 2d7f4c

Google psycoacoustics


>>
Anonymous 15/12/13(Sun)14:10 No. 16263 ID: 53fc09

>>16205
Hey op, this delves into the field of psycho-acoustics.
also http://www.mp3-tech.org/programmer/docs/LA_report_53.pdf




Anonymous 15/11/18(Wed)03:47 No. 16245 ID: dd0d0b [Reply]
16245

File 144781482117.jpg - (8.25KB , 256x197 , Choice.jpg )

Best STEM degree?


1 post omitted. Click Reply to view.
>>
Nazi+Icktor 15/12/08(Tue)03:59 No. 16258 ID: 6db675

>>16257
I do not think it the best STEM major only if you like money. If you like working with and making new clean technology for others to use rightly then it is a good major for you.

My credibility: I solved the Hodge Conjecture - certainly, proved it at least.


>>
Nazi Icktor 15/12/08(Tue)04:00 No. 16259 ID: 6db675

>>16257
test


>>
Nazi Icktor 15/12/08(Tue)04:01 No. 16260 ID: 6db675

>>16245
>>16257
I do not think it the best STEM major only if you like money. If you like working with and making new clean technology for others to use rightly then it is a good major for you.

My credibility: I solved the Hodge Conjecture - certainly, proved it at least.




Conservation of Angular Momentum Anonymous 15/12/06(Sun)08:36 No. 16253 ID: 237410 [Reply]
16253

File 144938739318.jpg - (82.23KB , 484x230 , 06566.jpg )

How do i find a new speed of two objects that are spinning on top of a merry-go-round? If both objects are on a merry-go-round (on the edge) at a certain speed in meters per second, and one object decides to move to the center of the merry-go-round whilst still spinning. What would be the new speed, with a given radius of the merry-go-round of course. I know I have to use the angular momentum and the momentum formulas. Is there any other formulas that i should considered?

By the way--those two objects are humans, all i know is that the speed would definitely increase.


>>
Anonymous 15/12/06(Sun)17:45 No. 16256 ID: ef0164

You've confused yourself already, you're not looking at momentum you're looking at speed.

Find you angular speed: w=v/r
This is a constant and won't change unless the merry-go-round speeds up/slows down.

You've got w you've got your new radius, if you can't figure the rest you've got problems.




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