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/sci/ Science & Math

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Most viewed threads in this category

3 more posts in this thread. [Missing image file: 09.png]
Does anybody have a .pdf of On Numbers and Games by John Conway?
2 more posts in this thread. [Missing image file: 1385681948038.gif]
http://www.bbc.co.uk/news/health-25156510 Was Freud right all along /sci/? >Behaviour can be affected by events in previous generations which have been passed on through a form of genetic memory, animal studies suggest. >"The experiences of a parent, even before conceiving, markedly influence both structure and function in the nervous system of subsequent generations," the report concluded. >One of the researchers Dr Brian Dias told the BBC: "This might be one mechanism that descendants show imprints of their ancestor.

Valence Band Maxima always at \Gamma ?

2 more posts in this thread. [Missing image file: gaas.png]
Sup, /sci/, I'm currently writing some solid state physics code, using the Empirical Pseudopotential Method ( https://github.com/aphirst/BandFTN if anyone's interested), and I'm having trouble reasoning-out my next step. Pic related is the kind of output my code gives presently, specifically that's the bandstructure of GaAs. As you can see, the energy axis has not been normalised as per the usual convention, i.e. "0 at the top of the Valence Band". What I want to be able to do is automatically determine where the 'top of the valence band' is, and shift the energies (or the graph axis, doesn't matter which), by the appropriate amount. However, I'm not sure what sort of algorithm that would be like. My initial idea was to consider the "valence bands" to be the first (bottom) set of mutually-overlapping bands. That works for materials like Si or Ge, but as you can see in the attached picture for GaAs, some materials have a "gap" before (below) the top of the VB. Would it be sufficiently general to do something like: >check each band (from the bottom, upwards) to see if its maximum is at $\Gamma$ >once you find one, check which bands after (above) mutually intersect >the last (highest) of these must be the top valence band Does the top of the VB necessarily have to be at $\Gamma$ ? Are there any semiconductors/metals for which my greentexted algorithm would fail to recognise which bands were Valence and which were Conduction? If so, what ought the approach be?
0 more posts in this thread. [Missing image file: Gerald-Ford-9298683-1-402.jpg]
Is there any life form that would survive on mars? If so, why not bring such a life form to mars?

Comet ISON = Nibiru

17 more posts in this thread. [Missing image file: ASTROID HITTING EARTH AWS(...).jpg]
COMET ISON HEADED STRAIGHT TOWARD EARTH IN MANY FRAGMENTS http://stereo-ssc.nascom.nasa.gov/comet_ison/ http://www.nytimes.com/2013/11/30/science/space/comet-presumed-dead-shows-new-life.html Astronomers are marveling at the death and apparent resurrection of a comet that dove close to the sun on Thanksgiving. Comet ISON passed within a million miles of the sun’s surface at 1:37 p.m. Eastern time on Thursday — by which time observers had already glumly concluded that the comet had disintegrated and vaporized. ISON, which spent several billion years at the frigid edge of the solar system before starting a long journey toward the sun, had been billed as a possible “comet of the century.” Its demise seemed to be an anticlimactic ending to the story. But “then it appears again,” said Karl Battams, an astrophysicist at the Naval Research Laboratory who has been observing the comet from Kitt Peak National Observatory in Arizona. “We see something come out.” === The second angel sounded, and something like a great mountain burning with fire was thrown into the sea; and a third of the sea became blood, and a third of the creatures which were in the sea and had life, died; and a third of the ships were destroyed. The third angel sounded, and a great star fell from heaven, burning like a torch, and it fell on a third of the rivers and on the springs of waters. The name of the star is called Wormwood; and a third of the waters became wormwood, and many men died from the waters, because they were made bitter. Revelations 8
1 more posts in this thread. [Missing image file: honeycomb1.gif]
Hey /sci/ When I was in high school we learned about how honey-bees use hexagons because they're the most efficient shape for making walls (IE require the least material). Why don't we use this principle when designing cities? Is there a reason that it's better to have square vs hexagonal cities? Dumbing down is appreciated, but I'd also love to see the actual math behind the concept.

What's weirder than a Theory Of Quantum Gravity?

2 more posts in this thread. [Missing image file: shut up bitch im doing sc(...).jpg]
So a couple of the guys and got together and one of them asked, "What's the hardest thing you can't wrap your mind around?" One of them pipes up and says Quantum Gravity and I agree. Then another friend pipes up and says there are stranger things than that, though the dilweed doesn't give an example. What say you /sci/?
41 more posts in this thread. [Missing image file: vishnu, looking stunning (...).jpg]
True faith is the next step in mankind's teleological journey towards absolute truth. The dialectic of intellectual history has culminated to this point in time, /sci/. It has all become so clear: the vast unverified hypotheses of quantum physicists, the abysmal uncertainty of philosophers of mathematics and science, the incompleteness theorems and NP completeness. True faith is the humanity's next step in its hegelian discourse. What does this mean? What are the implications of this? Are the theists on the right track? Adopt faith in God, adopt faith in the world, adopt faith in yourself, because if you remain tied to the obsolete nonsense that science preaches you'll be left behind like the alchemists and the mystics. Embrace your intellectual destinies, /sci/
20 more posts in this thread. [Missing image file: qI4QgJl.jpg]
I was thinking about stuff. What would happen if all the bacteria in your digestive tract died? Would you die? If so, could you engineer a bacteriophage which is only transmitted sexually and targets intestinal bacteria? It could be used to wipe out the gays.
0 more posts in this thread. [Missing image file: 1472765_657022481009495_1(...).jpg]
Can you help me solve this, /sci/? A goldsmith has two gold alloys. The first alloy is 40% gold; the second alloy is 70% gold. How many grams of each should be mixed to produce 20 grams of an alloy that is 58% gold?

A Model for a New Government

39 more posts in this thread. [Missing image file: picture053-gray.jpg]
A New Government: Council based. 1.) Mail council 2.) Mathematics council 3.) Building council 4.) Science council 5.) Food council 6.) Brief, general council consisting of members of other councils. There is no permanent council. Agreements are made by the workers of the council. To be specific: - all of the workers in each of their assigned councils make rules for themselves. - i.e. mail for mail, math for math, science for science - the brief, general council is composed of members from the other councils That is all. The format is clear and concise. Basic, so that those of lower IQ or breakers/destroyers are taken care of. We are a worker based and problem-solving based society. The work is problem-solving. Sources: 1.) Noam Chomsky 2.) Francis Fukuyama
39 more posts in this thread. [Missing image file: 1384336676980.jpg]
(The last 2 digits of your post number) * 2 is your IQ for the rest of your life.
5 more posts in this thread. [Missing image file: can't touch this.png]
I just found something that will shake the foundations of mathematics as we know it
3 more posts in this thread. [Missing image file: itsavirus.jpg]
ITT: Common misconceptions Also, "Don't go outside, you'll catch a cold because it's so freezing"
17 more posts in this thread. [Missing image file: disgusting.gif]
>hurrr durr scientists discovered the gene that makes people violent >hurrr durr the homosexual gene >hurr durr the intelligence ger >hurr durr muh biological reductism >hurr durr it's all in the genes u r just a stoopid sociologist http://learn.genetics.utah.edu/content/epigenetics/rats/
17 more posts in this thread. [Missing image file: 600838_10202160641238010_(...).jpg]
environmentally friendly sustainable energy to power our planet discuss
18 more posts in this thread. [Missing image file: 62362.8.jpg]
Why are fun things fun?
0 more posts in this thread. [Missing image file: hodeme-hodagelle.jpg]
Do you believe what this woman says? She believes women can orgasm by brushing their teeth. When I hear of supposed cases like that, I think they must have been lying or psychotic (maybe they had a crazy fetish bout brushing teeth--not actual orgasm from the act of it). I just want to know why anyone would believe such stories. I want to see these claims put to scientific testing, not just believing these nutjobs who want to be weird. There weirdos threaten my idea of what we should be -- normal humans. https://www.youtube.com/watch?v=7jx0dTYUO5E

What is your view on self-plagiarism?

0 more posts in this thread. [Missing image file: No_Plagiarism.gif]
I am in the first semester of my first post-doc position and many of my colleagues have a very relaxed approach to copypasta of their own work. It is not necessarily condoned, but it is accepted with adequate citation. During my undergraduate career, I had many peers that would reuse blocks of their own papers (particular for theory sections of reports) and I never knew one of them to be disciplined. Please consider four specific cases: 1. Direct copy of your own informal work (eg. lab reports and protocols) without citation 2. Case 1 with citation 3. Direct copy of your own formal work (eg. published material or work owned by an entity other than yourself) without citation 4. Case 3 with citation Where do you draw the line and how should academia deal with "self-plagiarism"?
6 more posts in this thread. [Missing image file: spss2[1].jpg]
Why is SPSS so expensive? Am I even reading the website correctly? Over $2300 for a 1 year license? That's not even the professional package! https://www-112.ibm.com/software/howtobuy/buyingtools/paexpress/Express?part_number=D0EKZLL%2CD0EEMLL%2CD0EK0LL%2CD0EEJLL&catalogLocale=en_US&Locale=en_US&country=USA&PT=jsp&CC=USA&VP=&TACTICS=%26S_TACT%3D%26S_CMP%3D%26brand%3Dnone&ibm-submit=View+US+prices+%26+buy

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