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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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10 posts and 2 images omitted. Click Reply to view.
Anonymous 15/07/02(Thu)01:17 No. 16168 ID: 7d0760

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

Electrolysis and Renewable Energy Mfats 15/10/07(Wed)09:54 No. 16215 ID: e329a9 [Reply]

Youtube - Toggle Video
  Im currently devoting my time to developing a new form of renewable energy based off of the already-existing Hydrogen fuel cell concept. I plan to experiment using different combinations of electrolytes, anode/cathode materials, voltages/amps etc. Ive started a kickstarter campaign in order to fund the research. To keep things short and sweet, I'm looking for backers to help with my project; anything at all helps! Also, use this thread to share opinions/ideas on fuel cells and how they could be made more efficient. So far my research has lead to the creation of a basic fuel cell, some new concepts and 12,000 volts accidentally delivered directly to my genitals (dont lean on loose wires). https://www.kickstarter.com/projects/718106819/advancement-in-electrolytic-energy-production

plane Anonymous 12/11/18(Sun)21:09 No. 14427 ID: fb908a [Reply]

File 135326934614.jpg - (54.35KB , 384x288 , Futuristic_Plane[1].jpg )

Hi /sci/, I'm making a concept of a electric jet. What would you use as a energy storage. It should contain 3 MW/h and weight less then 400 kg.

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Anonymous 15/07/02(Thu)22:59 No. 16169 ID: 393361

Honestly a nuclear generator is by far the best option and already has proof of concept.

Anonymous 15/10/06(Tue)05:57 No. 16213 ID: 4da266

Multiple extension cords.

Anonymous 15/10/06(Tue)22:04 No. 16214 ID: 6828d1

Rigid airship: use the innate buoyancy to offset the weight of battery.

What's that you say Skippy? It's a jet, not an airship. Fill the internal cavities with hydrogen pockets and it'll have the same affect.

Sci-fi 20/Traveller 20 rule book PDF Anonymous 15/10/04(Sun)23:42 No. 16212 ID: 592535 [Reply]

Youtube - Toggle Video
  Me and a couple friends are looking for the PDF collections of Sci-Fi 20 and Traveller 20 roleplaying games.

Could anybody lend us a hand?

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

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.

2 posts omitted. Click Reply to view.
Anonymous 15/10/03(Sat)20:42 No. 16208 ID: 7d9839


Anonymous 15/10/04(Sun)00:03 No. 16210 ID: cd3867

Most excellent! I'll get on that as soon as i can find my keyboard. If i can't find it, i'll get a used guitar for cheap.

However, there is also the more sciency part of it all. How does tweaking sound work? How to distort a sound or a noise? What is it that actually happens, for example with autotuning? Certainly, there must be some way to describe what is happening that isn't just a feeling?

Anonymous 15/10/04(Sun)00:15 No. 16211 ID: cd3867

Perhaps i should clarify, just in case. I know about wavelengths and frequencies, but i don't fully understand how they can be tweaked for a desired effect.

For example, if the frequency is high, but the wavelength is long... I have a hard time putting it all into images the way i am used to when figuring things out.

BCBA Exam is a Scam Anish 15/10/03(Sat)20:49 No. 16209 ID: 3b12fc [Reply]

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Hello, my name is Anish Patel and you should read this if you have ever taken or plan to take the BCBA exam.

I am someone who, let’s just say know how things work.

Have you failed the BCBA exam.

This may be the reason why.

The board raises the percent rate to pass as each person meets that rate or passes the test. Here is an example, let’s say the starting rate to pass the test is 76 percent and there are ten people taking the test. The first person taking the test passes, the rate is still 76 percent. The second person that takes the exam passes, now the board raises the pass rate to 77 percent. The third person takes the test and passes; now the board raises it to 78 percent. So even if the next couple of people got the original rate of 76 or 77 percent, they now will fail, And everyone who got the original passing rate of 76 percent, will also now fail, because the board kept raising the rate. As more and more people pass the higher. Then eventually after a certain percentage of people pass the test, the board will have a cutoff point. Did you ever just miss the exam by a couple of points? Chances are you really passed but were part of the cut off.

The way you pass the test is almost by luck, not by aptitude. It depends on how many people take the test, and how many people pass, and what the cut off rate is. Not only is the grading of the test scores is manipulated, but after a certain number of people pass the board will fail everyone after that point whether they passed or not. How you ever wondered why it takes 45 days after you take your test to get the results. You are taking your test on a computer, the results should be instant. The waiting period is for the board to see how many people took the test and for the board to decide how to manipulate the test scores and decide a cut off rate. There is a 150 questions you get a certain amount of questions right you either pass or fail. They claim they are measuring you and weighing you against other candidates. The board states their own words on the report they send you “The graph shows your performance in comparison to the group of candidates who have “just passed” the examination. These are candidates who obtained scaled scores between 400 and 414 (which is 1 standard error of measurement [SEM]* above 400.)” Chances are you just were on the wrong side of their manipulated passing line.

The board also looks down on you if you fail the test. Each time you have to take the test, you will have to start at a higher percentage point, in order to pass. That is why people are taking the BCBA exam multiple times.

The board claims it is all about “ethics” but they are being the most unethical.
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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.

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.

polymeric falcighol derivation John 15/09/28(Mon)22:21 No. 16201 ID: e8c624 [Reply]

Youtube - Toggle Video
  c = λ/2 (1-λ/2)

Anonymous 14/10/27(Mon)22:39 No. 15950 ID: d126e2 [Reply]

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What are the factual negative and positive side effects from watching pornography? I recently did some reading into this and found a lot of articles talking about how the neurons create stronger pathways to the brain from the pleasure reward that comes from watching pornography (much similar to the effects from taking drugs). This can lead to addiction and dependency on this type of stimulus to become aroused. So I come to you /sci, does pornography have a negative effect on the brain?

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Anonymous 15/08/17(Mon)06:15 No. 16185 ID: 56cebc

Ah, camaraderie. Good sex analogy there.

Anonymous 15/09/16(Wed)04:44 No. 16194 ID: 93ff3e

so, he only does it in public at bars?


Anonymous 15/09/28(Mon)07:21 No. 16200 ID: 751c6d

I'm the opposite. Porn doesn't work anymore, but real (casual) sex is even worse than porn. The only thing that works is being in love. But that also gets worse over time. Still works, unlike porn and casual sex, but I expect that this too will eventually stop working, even though I'm very much in love.

I don't mind a sexless relationship. It's really about the pleasure of being with the person, whatever form that pleasure may take.

Anonymous 14/04/18(Fri)01:45 No. 15631 ID: 0f9d09 [Reply]

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So they found a new exoplanet that may be habitable, 490 light-years away. That is so great I guess Palestinians and Jews will stop killing each other now.

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D 15/09/18(Fri)18:16 No. 16195 ID: 7d9d65

I get up every morning and think, you know, since I'm jewish, I'm going to go kill some palestinians now.

Anonymous 15/09/26(Sat)06:10 No. 16198 ID: b97d8a

That may sound like sarcasm, unless you're an israeli soldier then its like a daily prayer.

Anonymous 15/09/26(Sat)06:18 No. 16199 ID: b97d8a

20 billion? You're crazy. We barely have enough now. I guess you haven't kept up with how crops are strained to the limits of genetic modification and pest controls. Basic staples like rice that once took up a quarter of the third world's income to buy, now takes half or more because of supply (lack of it). Water.... large freshwater lakes are starting to lose water instead of maintaining and replenishing because of growing populations and especially industries using crazy amounts of it. TThe whole bottled water craze is accounting for big chunk of it, when the fact is that the bottled water you buy is probably siphoned from some far-off source that is specifically chosen because it's cheaper and less-regulated than a local source, and so the water in your bottle has probably been less thoroughly tested and treated than your municipal supply. Look, Europe has had to absorb about 100,000 syrian refugees and already they're feeling strained. And you think we can support an extra 12 billion? You should research what the Council on Foreign Relations thinks needs to happen to population.

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