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/sci/ Science & Math

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Most viewed threads in this category

66 more posts in this thread. [Missing image file: 232.jpg]
Cicada 3301 Recruitment puzzle is back. Anybody interested in IT, Cryptography and Freedom of information welcome. IRC: http://webchat.freenode.net/?channels=#33012013 Outguess: http://pastebin.com/KGfE6DVt Dropbox: https://www.dropbox.com/s/r7sgeb5dtmzj14s/3301 CicadaOS: http://www.youtube.com/watch?v=GGMrmsWxQ5E Twitter: https://twitter.com/1231507051321 Wiki: http://uncovering-cicada.wikia.com/ Mural chart: http://mrl.li/X2p8Ry
10 more posts in this thread. [Missing image file: models and bottles.jpg]
Hey /sci/, can you give me some tips on finding textbook pdf? Ebookee used to be my to-go place but most of the links are dead now. I've been combing google for hours but couldn't find any of my textbook. Can any of you help out a fellow scientist please? -introduction to molecular thermodynamics by hanson and green -The elements of physical chemistry 6th edition by atkins -Quanta, matter and Change - a molecular approach to physical chemistry by Atkins, de Paula and Friedman -Physical Chemistry-A Molecular Approach. McQuarrie and Simon -Molecular Quantum Mechanics. Atkins and Friedman -Biochemistry 3rd by matthews, van holde, appling and anthony-cahill -the organic chemistry of biological pathways by Mcmurry and begley -Advanced organic chemistry by bernard miller 2nd edition These are some of my txtbooks this semester, PLEASE HELP ;_;
1 more posts in this thread. [Missing image file: maxminthermo.jpg]
How do minimum (alcohol) and maximum (mercury) thermometers work? Here is one definition I found for minimum thermometer: >"The liquid used in minimum thermometer is alcohol in which a dumb-bell-shaped index is set. When the temperature falls, the alcohol column drags the index towards the bulb end but when the temperature rises the alcohol column expands and runs past the index without disturbing it. Thus the end of the index farthest from the bulb gives the lowest temperature attained in a day." How does it drag the index? And why doesn't it move the index when it expands? Is there some kind of animation anywhere. I couldn't find anything on Youtube. -- Maximum thermometer: >"Maximum thermometer is also a mercury-in-glass thermometer having a constriction near the bulb end. When the temperature of air rises, the mercury in the thermometer expands and forces its way into the stem past this constriction. But when the bulb cools none of the mercury above the constriction will get back into the bulb and then the length of the mercury remains the same. The end of the mercury thread farthest from the bulb registers the highest temperature reached in a day." Why can't mercury go back down past the constriction when it cools down? Why is the maximum thermometer slightly tilted? Wouldn't the expanded mercury past the constriction point go back down to constriction point when it cools down?
21 more posts in this thread. [Missing image file: SimpleMutantStrawberry.jpg]
Explain why a polynomial of odd degree must have at least one real zero. This is killing me because I know Descartes' law, and yet I have no idea what the answer to this question is. What is it? A single sentence answer is perfect.

What's so bad about INFPs?

63 more posts in this thread. [Missing image file: wwswq.png]
So, I'm a medical student, but I'm also an INFP, a friend of mine seems to think this means I'm destined to fail at medicine. Why? I'm not sure what the NF means, but my friend was able to explain about perceiving and judging and I already knew about introverted/extroverted. That being said, from what I do understand, I'm introverted, which just means I do a lot of extra-research because I'd rather be doing that than socializing a lot of the time. And if I withhold judgment wouldn't that make me good at diagnosis? My friend does neuroscience, so I tend to trust his opinions on these matters, and looking the type up on Wikipedia it thinks I'd make a great writer which, oddly enough, makes sense to me. I never thought of it as a career path but I genuinely do love to write, just for my own satisfaction. If I don't write anything for a while I tend to get grumpy and/or every other thing I say is some sort of pun. Anyway, before this gets any more self-indulgent, what do you guys think? About personality tests? About my personality (doing the test I scored really high on every factor except I, which was 20, everything else was 60+. I dunno what that means, but maybe someone else does?)
11 more posts in this thread. [Missing image file: 119600981_Mpemba_372841c.jpg]
How the heck do you pronounce Mpemba ? I cant find a single definitive webpage. What the hell?
18 more posts in this thread. [Missing image file: 1358349182394.png]
Okay, this is what we have so far. We might have a connection between 4220220 and 332 and it's Decatur, Illinois IF we take the first number as a phone number and the second one as an area code.
49 more posts in this thread. [Missing image file: 1357864145427.jpg]
What are the limitations of building shit in space? Hoe big, assuming you had the resources, could you go before you had structural soundness problems? Are O'Neil cylinder type structures possible?

titrations

1 more posts in this thread. [Missing image file: a-thermometric-titration-281.jpg]
I'm currently doing my AH chemistry investigation on a thermometric titration between HCl and NaOH/ CH3COOH and NaOH, and I need to find some decent sources for background theory. Also, in the guide for the experiment, it just says "make graph with results", which is fine, but then it says "find enthalpy of neutralisation", which I am not sure how to do.
3 more posts in this thread. [Missing image file: A440waves.jpg]
Ironically /mu/ is retarded when it comes to this part of music since it deals more with acoustics than aesthetics. Is there any solid argument for the tuning A432 rather than A440? A lot of it is psuedoscience and correlations but I want solid proof
5 more posts in this thread. [Missing image file: Frechet.jpg]
I am learning french, and i'm wondering if anyone knows of any good french resources. I.e. websites that check grammar, actually good movies in french, french news, ect... Pic related, Frechet is french and discovered metric spaces. So general metric space theorem discussion.
3 more posts in this thread. [Missing image file: advice god.jpg]
Sup sci, been reading about trading recently just want to ask some question.. Is High Frequency Trading hax? How hard it is to start a HFT firm?
0 more posts in this thread. [Missing image file: VeY5N.jpg]
DONE
5 more posts in this thread. [Missing image file: failownedr.jpg]
Hey /sci/, quick question. I need help understanding something from BCS theory: how does one show that the Cooper pair flow is actually dissipationless? The simplest idea that I got is since that there's an energy gap in excitation spectrum the Cooper-pair state simply cannot scatter to anything. Is that it?
2 more posts in this thread. [Missing image file: maths.jpg]
Hello /sci/ Would be awesome if someone spared a minute for this, I'm sure this is very easy for the most of you and this is almost embarrassing to ask. Here is the first stage of a transportation problem that I don't understand, how did my teacher find out what routes to use (PB PC QA QB etc)? Thanks so much
0 more posts in this thread. [Missing image file: 1353795205757.gif]
http://free-energy-info.co.uk/PJKBook.html Anyone want to take a look and talk about this?

Linear Algebra question

12 more posts in this thread. [Missing image file: Linear-Algebra-9780130084514.jpg]
hey /sci/, I was hoping someone here could help me understand an exercise I'm having trouble with. I already have the solution from the instructors manual, but I don't completely agree with a step being trivial, since I'm having trouble proving it. The question: Let U be a linear operator on a finite-dimensional vector space V. Prove that: if the dimension of the range of U^m equals the dimension of the range of U^{m+1} for some positive integer m, then the dimension of the range of U^m equals the dimension of the range of U^k for any positive integer k greater than or equal to m. I think that I can prove this if I can prove that range(U^{p})\supseteq range(U^{p+1}) for all p, since then the range of U^m would actually be equal to the range of U^{m+1}, and I could apply induction to finish the proof. Am I wrong? Is range(U^{p})\supseteq range(U^{p+1}) too hard to prove? It seems to me like it should not be, but here I am. Any pointers to help me out /sci/?
5 more posts in this thread. [Missing image file: Transistor_Count_and_Moore's_L(...).png]
when will this stop?
1 more posts in this thread. [Missing image file: Exocytosis-machinery.jpg]
Anybody here use ImageJ or Fiji? a) How the fuck do I multiple line integrals on the same picture? The line tool is easy enough, but my line disappears as soon as I try to draw another. and.. b) Having finally figured out how to cause that line to also draw on a synchronized image at the same coordinates, how can I get a plot of the integral? Ctrl-k gives me the plot for the first window, but not the second one. >inb4 manual, ive read it front to back and frankly at this point im either retarded or convinced its a piece of shit when it comes to answering simple and i would think common questions. ckedman conjuga help me /sci, you're my only hope.
26 more posts in this thread. [Missing image file: 1354919253953.jpg]
Why do you want to do science? Please think and be honest.






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