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/sci/ Science & Math

Threads added between 2013/02/27 and 2013/03/06

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Most viewed threads in this category

8 more posts in this thread. [Missing image file: map00190.png]
Hey, /sci/. I've got a Bio 101 short essay question that is killing me and taking up time that I could be using more productively for other schoolwork. If you guys could help me out with this within the next 3-4 hours, I would be extremely grateful. Hell, I wouldn't mind giving $5-13 via PayPal to whoever could first take the time to arrange a good answer (close to 100 words). Here it is: Explain how oxidative phosphorylation is an example of how new properties emerge at each level of the biological hierarchy.
13 more posts in this thread. [Missing image file: Fphoto-44349803D-2RM[1].jpg]
dear /sci/ why the FUCK is my 10 molarity HCl turning fucking yellow? it's clear then i pour it into glassware and it turns yellow. my equipment is fucking clean. what the fuck is going on? is the HCl being oxidized producing chlorine? pic semi related. not that yellow, but fairly yellow.
7 more posts in this thread. [Missing image file: algebraic-graph-theory-c-d-godsil-p(...).jpg]
Anyone have a PDF of Algebraic Graph Theory by Godsil and Royle? I need it to study for the upcoming USAMO.
0 more posts in this thread. [Missing image file: hs-2004-32-d-large_web.jpg]
https://docs.google.com/document/d/1r6lqZTKOyv6Uk0MP-KyU8ZzX17Ct48vc85c2zXyrEz0/edit?usp=sharing Comment pls
6 more posts in this thread. [Missing image file: 1329007439537.jpg]
The automatic opening device of a military cargo parachute has been designed to open when the parachute is 200 metre above ground. The manufacturer claims that the opening altitude of the parachutes has a Normal distribution with the mean value of 200 m and standard deviation of ?=30 m. (a) Equipment damage will occur if the parachute opens at an altitude of less than 100 m when it is dropped from the air. (i) Calculate the probability of equipment damage to the payload of a parachute dropped from the air. (ii) Calculate the probability that there is equipment damage to the payload of at least one of the five independently dropped parachutes? I've completed part one - but I'm struggling with part two. Can anyone give me a hint? I know I'm working with z-scores and the tables but I'm confused. Many thanks.

Curvilinear Asymptotes?

5 more posts in this thread. [Missing image file: Parabolic_Architecture.jpg]
curvilinear asymptotes, slant asymptotes, and oblique asymptotes are the same thing right? On my Pre-Calc HW There are problem sections that say to find the oblique asymptotes, and then there are others that say to find the curvilinear asymptotes. >What's the difference?
2 more posts in this thread. [Missing image file: 29a.gif]
http://www.youtube.com/watch?v=ivu4nlvD_90 Water is so fucking cool.
36 more posts in this thread. [Missing image file: 851896B4-277D-486E-836F-061AC149C52(...).jpg]
>An early detection test for pancreatic cancer: Jack Andraka at TED2013 http://blog.ted.com/2013/02/27/an-early-detection-test-for-pancreatic-cancer-jack-andraka-at-ted2013/ This kid invented a safe, effective and cheap test for pancreatic cancer. 1. Is the media hyping this, or did he really do this all himself? 2. Why shouldn't I an hero? Should this kid be a source of inspiration or a realization of how pathetic my life is?
11 more posts in this thread. [Missing image file: IrisDatabase.png]
So I have black eyes, and my iris looks like this with the night vision of any handy cam. Then I point it at someone with green eyes, their iris looks black. Can /sci/ explain? >pic is not of my eyes
17 more posts in this thread. [Missing image file: ratbot2-1360741943809-1360776782921.jpg]
Regarding Connectionism and its use in AI While it seemingly work pretty well in various demonstrations. And I was intially very impressed by it. The more I read about it however the less elegant it seems and leans more towards some variation of brute force. The whole process looks like learning to play the piano by bashing it in a hamfisted manner and looking at the audience reaction and vary the bashing based on that, as opposed to refined study and practice.
35 more posts in this thread. [Missing image file: sci.jpg]
Hey /sci/, should i major in chemical engineering?
20 more posts in this thread. [Missing image file: 1356770882521.gif]
Fuck man. Mathematical rigor is the worst. It's like jumping through hoops to show the most obvious things. Really. Is it normal to feel this way when first introduced to this horrid thing? I mean, I sometimes can see the beauty of it, but then it slaps me in the face with the fact that I might need a whole page to explain or prove something I could have done in just one or two sentences. Also, recommend me books for dealing with this shit. Can be textbooks or other, I just need something different from my current course book. The sticky has none of this as far as I can tell.

Mating Probabilities

30 more posts in this thread. [Missing image file: musica.jpg]
Lets see if we can find the chances of finding a suitable mate using my personal selection criteria: -Must not be fat. 6/10 (0.6) Americans are too fat (this includes the obese plus the curvy types). -Must not smoke. I think its about 1/5 (0.2) -Must not be a lesbian. 1/20 (0.05) -Must not have cats (I'm allergic). 1/2 (0.5) -Must be moderately attractive. Standard curve, above 1 standard deviation acceptable. 3.18/10 (0.318) -Must be at or around target age (1/5) (0.2) -Must believe in global warming (47/100) (0.47) -Must not be religious (about 4%) (0.04) so we have 0.6 * 0.2 * 0.05 * 0.5 * 0.318 * 0.2 * 0.47 * 0.04 = 0.00000358704 Out of a US population of 320 million, 320000000 * 0.00000358704 = 1147.8528 There are only about 1,148 girls which meet my criteria. Lets say I'm above average in looks, and only 40% of them will reject me. That leaves about 669 women who are eligible. Lets take the population density of America, 88.6 people/sq mi, and half being women, then 44.3 * 0.00000358704, then the probability is about (0.000159 * 100) or about 1.6% that she's in ANY given square mile. These are shit odds, /sci/. What do?
6 more posts in this thread. [Missing image file: 20100501..gif]
are there any evidence of artificial nucleosynthesis made on Earth?

black holes

7 more posts in this thread. [Missing image file: url.jpg]
Hey /sci/, i was wondering if u could tell me if in theory i was to stand in the middle of a black hole and hold a flash light, would i see the light? me and my friend were talking about this and i came up with that if i point it at me i would see it but not if i pointed it out and i would see the light of everything outside the black hole
14 more posts in this thread. [Missing image file: Lighthouse.jpg]
Hi everyone. I'm 18 years old, and I started getting episodes of insomnia in early January (I was 17 at the time, my birthday is in February) and in February it developed into something more persistent. I tried diphenhydramine as well as melatonin and nothing seems to be helping me. I feel deprived of motivation, no libido, and dumber than ever before. It is now March, and although the insomnia has been somewhat alleviated, I still don't get enough sleep during the night. I have accumulated an overwhelming amount of sleep debt and I feel absolutely dead mentally. To worsen my situation I have school to tend to as well, (and they are AP classes). I want to return to my original mental state very much. I wanted to know whether insomnia causes permanent/irreversible brain damage (especially at my age since I'm only 18 and my brain is still evolving). I sleep better now, but I still feel tremendously burdened mentally by brain fog due to my sleep debt. Please reply asap. Your feedback will be immensely appreciated.

Life

6 more posts in this thread. [Missing image file: 83056702.gif]
'Evnening /sci/ Is particles enough in order to create life?
9 more posts in this thread. [Missing image file: protein.png]
Is there a program to simulate whole protein reaction with an organic chemical compound ( ligand) and how is changes it conformation?
11 more posts in this thread. [Missing image file: 3426234.jpg]
May be a noob question but here goes, Isn't a gene just three nucleotides, what is the significance of three? Why do we classify them separately? The most logical thing I could come up with is let's say there are 5 DNA sequences differing in everything but a 3 consecutive nucleotides and still functional. Something like this could implicate that those 3 are the source of the function...?
4 more posts in this thread. [Missing image file: 1324186678112.jpg]
>2013 >using Mathematica >not using open source software like Sage >treating Stephen Wolfram like a god ISHYGDDT






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