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/sci/ board - Science & Math - February 2014

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Most viewed threads in this category

So, I was going to ask this... 62 posts and 8 image replies omitted. Click to view.
So, I was going to ask this question in /g/, but they are too busy arguing about which distro is the best. Anyway, I'm interested in learning Matlab, but I was wondering what is it actually used for? Is there an advantage of using matlab instead of other programming languages? Also, if you are a Matlab user (I'm guessing a lot of you are), what are you using it for exactly? Oh, and do you have any suggestions on where to start? Thanks :3
Let me get this... 8 posts and 0 image replies omitted. Click to view.
Let me get this straight >Universe >No such thing as true nothing >Empty space contains dark energy >Combined with gravity = 0 total energy >Different Universes exist with different energy levels/laws of physics >But our Universe is the only one where the energy levels/laws of physics were at the right levels to allow for a big bang and galaxies to form >We spontaneously came from a 0 energy state that split and allowed bodies of virtual matter to form >Other Universes are just empty, closed, or a weird energy state? >And infinite timeline of universe possibilities eventually leads to one like ours. >The Universe was going to happen by itself no matter what, there was no other way

Hopfield Network Simulators

Hopfield Network Simulators 1 posts and 0 image replies omitted. Click to view.
Any good Hopfield neural network simulators?

helical gear

helical gear 2 posts and 1 image replies omitted. Click to view.
Hi all looking for knowledge about helical gears, if you cut a helical gear 45 degrees left and cross over with 45 degrees right over the same cut what sort of impact will that make on the strength of the gear is it possible or would it just crack?
Any fusor builders on /sci/? I... 24 posts and 4 image replies omitted. Click to view.
Any fusor builders on /sci/? I am restarting my project to build mine. It's been about 4 years and I've forgotten quite a bit behind the theory and construction of it, but I just found my old notes and schematics so I think I should be able to figure it out. My question is, does anyone know the average price for a compressed cylinder of deuterium? I'm thinking I'll probably get a 50-100L tank.
any math majors here?what... 10 posts and 0 image replies omitted. Click to view.
any math majors here? what inspired you to want to learn math?
I desperately need some help... 0 posts and 0 image replies omitted. Click to view.
I desperately need some help with something guys. I have been working with vectors and equations of motion, etc for a few years now, but I still manage to stuff it up constantly. I understand the theory behind what I have been taught, but every time I do the calculations myself I just end up confused or I make stupid mistakes. Any tips on how to get better at this? It is a major problem, and is hindering what I want to do.

Special Relativity Length Contraction

Special Relativity Length... 1 posts and 0 image replies omitted. Click to view.
So, in thought experiments about length contraction, like the ladder paradox... We take a ladder that is longer than a barn (i.e. the two ends of the ladder can't be in the barn at the same time), and then move the ladder at high velocity, so that the ladder gets shorter and the two ends of the ladder get closer together, so that we can now fit the ladder in the barn. But... if we think about how we actually made the ladder move... Say we, from the barn's perspective, accelerate each part of the ladder at the same rate until the ladder reaches the desired velocity. But then consider the ladder's two ends. They were initially stationary, and then we gave them identical accelerations. So at any point in time, they had the same velocity. But then this means that the two ends of the ladder must always have been the same distance apart. So the ladder has the same length and it can't fit in the barn. You stumped?
This seems to be the board for... 0 posts and 0 image replies omitted. Click to view.
This seems to be the board for academic questions so; I'm 18 and I completely jerked off in high school my freshman and sophomore years, and only a little extracurricular activity. I'm graduating soon, am I doomed to never get into a good undergrad school? What should I do to make myself more appealing?
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I need some help from the maths guys out there, although it's pretty simple so anyone should be able to help. Even though I can subtract 2 numbers in my head, if I try to work it out on paper, I get it wrong every single time. Could someone walk me through each step of their working out for the numbers below? 1489 3270 ------- -1781 help me, 4chan, your my only hope
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Is the adjoint representation of a Lie algebra related to the concept of adjoint operators on Banach spaces or is the name a pure coincidence?
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>instasynch DOT com SLASH rooms SLASH iwork # Now streaming The Outer Limits ¯\_(?)_/¯ expect feels and occasional boners
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I don't even know what this math/physics concept is called (I know it's related to entropy) but I'm trying to figure this problem out. Say you had 2 rooms connected by a door, same size, both perfectly insulated. One room is 80 degrees, and the other is 50 degrees. If you opened the door, what would the end temperature of the two rooms be? Is it just an average? Or does it take more energy to heat the colder room than the hotter room provides, so it would be closer to 50? Sorry if this is a dumb question, I've never taken a physics class or anything and I'm not exactly sure how temperature change works.
0 posts and 0 image replies omitted. Click to view.
This is something that's always been bothering me. The partition coeffient equation (K = conc in solvent A / conc in solvent B) means that using smaller extractions is more efficient for extraction as opposed to one large extraction of the same total volume. To the point that you can reach 100% efficiency with an infinite amount of aliquouts. But why is this the case? I never had to take math beyond first year, so I'm just having a hard time rationalizing this in my head.


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My tax dollars pay for research. Why should I have to pay to read the journals. This stuff should be free.


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Hey, /sci/! We're playing 2 hours of Cosmos: A Personal Voyage, so come on in! Link's in the subject field

Sleft-teaching Mathematics

7 posts and 0 image replies omitted. Click to view.
What resources would /sci/ suggest for self-learning mathematics? I would prefer a platform that can assess your current level, such as a website or program. Thanks in advance.
7 posts and 0 image replies omitted. Click to view.
>taking linear algebra >doing hw >proving some results involving matrix(complex) norms >accidentally prove them for real matrices >get hw back >0/10 >mfw professor is a heartless bitch
4 posts and 1 image replies omitted. Click to view.
I need help. I'm in college algebra right now in my first semester of college and I'm failing the shit out of it. I did good enough on the ALEKs test (need to get a certain score to get into certain classes) for the class and passed the professor's own "see if you're smart enough" test with a 75, did fine on the first 2 quizzes, started failing after we started learning new shit and stopped reviewing. I have no idea how to actually study math, the professor doesn't do more than give one example per new concept in the lectures. I'm going to start going to tutoring tomorrow but I need to be able to learn on my own too, and I have no idea how to do that. When I see shit that I don't know, I have no idea what to do. I'll just stare blankly at the problem hoping I come up with something until I decide I'm fucked anyways, and that if I do think of something it'll be wrong and skip it. TL;DR How the fuck do I learn math on my own, failing MAC 1105, please help.
19 posts and 1 image replies omitted. Click to view.
Hey, /med/. I started taking benzene three years ago for chronic back pain and I haven't really seen improvement. Are there any 'eastern' treatments you can recommend?
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