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/sci/ Science & Math

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Most viewed threads in this category

2 more posts in this thread. [Missing image file: 677.jpg]
chem help? In the Haber process, ammonia is synthesized from nitrogen and hydrogen: N2(g)+3H2(g) yields 2NH3 (g)? sisco asked 2 years ago ?G°at 298 K for this reaction is -33.3 kj/mol. The value of ?G at 298 K for a reaction mixture that consists of 1.9 atm N2, 1.6 atm H2, and 0.65 atm NH3 is ____. a. -1.8 b.-3.86 x 10^3 c.-7.25x10^3 d.-104.5 e.-40.5 pic unrelated

Adderall use, any success?

11 more posts in this thread. [Missing image file: adderallxr30.jpg]
Anyone here ever use it? Did it help you science things? I'm a dumbfag who can't get good math grades.
5 more posts in this thread. [Missing image file: shutterstock_64256725.jpg]
How do you guys get into serious study mode and what methods do you use to prepare for a test? > Also how often do you're skills as a scholar effect your everyday life?
12 more posts in this thread. [Missing image file: probability_logo.png]
What is the best probability book? Must cover the basics: - finite sample spaces - conditional probability and independence - unidimensional random variables - random variables functions - random variables of two or more dimensions - discrete random variables (Poisson, Pascal, Multinomial, etc.) - continuous random variables - applications - etc. You know, the usual. The course has an emphasis on applications for engineering, it seems. But anything is fine, as long as it really teaches probability. The Apostol/Spivak of probability is what i'm asking, more or less.

CHERT GENERAL

0 more posts in this thread. [Missing image file: chert-380.jpg]
Eternal /cht/ thread Discuss any and all things CHERT
0 more posts in this thread. [Missing image file: IMG_1920.jpg]
Anyone here a biology major or at any level of higher education in the field of biology? If so, what sort of information would you pass on to a person looking to get their BS in biology and also, more importantly, to attain quality employment through higher education? Thanks
0 more posts in this thread. [Missing image file: Caratheodory0.png]
guys listen if we define measurability on outer measures like listen guys if we define it like this we can get this guys we get a borel measure! a borel measure from metric outer measures!
6 more posts in this thread. [Missing image file: IMG_20130922_130418.jpg]
Hello. I Just started learning logarithms and I encountered a problem. How do you solve : log (4?6) 1/6 (if its unclear : log base 1/6, logarithmic number 4?6)
1 more posts in this thread. [Missing image file: 1359127260997.jpg]
so, any of you into android programming and packet capture? working on an app similiar to "tpacketcapture". is any one familiar with that? Using VpnService to capture packets is working. now i'm creating my own socket for every connection and am basically the proxy between the phone and the socket, since i'm only getting real packets (ip / tcp header / application data) from the phone but only data from the socket ... neeed help!!
8 more posts in this thread. [Missing image file: s0pcyjy52ejl6g1z2kmi.jpg]
Linear Algebra vs. Multivariable Calculus (calculus 3). These are both second year courses but I love math and want to take a second math course as a first year student in the second term. I can only take one next semester though so which one is more useful/better to know first?
3 more posts in this thread. [Missing image file: beaker.jpg]
How necessary is A Level Chemistry (Britfag here) if you want to study mechanical/aerospace engineering or physics at a top uni? >pic unrelated
17 more posts in this thread. [Missing image file: 1369262784957.jpg]
What is it with autism that give a kid a chance to either be a useless dependent or a fucking genius? http://www.huffingtonpost.com/2013/05/11/jacob-barnett-autistic-14-year-old-nobel-prize_n_3254920.html
13 more posts in this thread. [Missing image file: text.png]
Someday (within 10 years) I will build myself laboratory (haven't seen/experienced how much I will be able to access university laboratories for my own projects,) because I have had big project of genetic/biology research since 18y old. I want to ask /sci/genetists or well biology researchers what kind of equipment I will need to build a average / top laboratory to research genetics, well to be more specific I want to be able to make research papers like this: http://nar.oxfordjournals.org/content/26/17/3908.full.pdf+html Please help me! ps. answers which indicate price, specific equipment etc very much appreciated

Any scientists around?

6 more posts in this thread. [Missing image file: 1360199866506.gif]
http://en.wikipedia.org/wiki/Petroleum_exploration_in_the_Arctic So, oil is created by animal remains that are subjected to sedimentary processes, and then brought to a simmer by metamorphic processes, correct -- or close enough? How exactly does this fit into modern science? How was the arctic so livable millions of years ago? Is evolution wrong? Is global warming wrong? Is Earth crust displacement true? Or is the arctic just a massive sea animal graveyard where everything goes to die? Even so, wouldn't the crustaceans just eat everything eventually? The bones would simply be eroded into sediments before they could be subjected to such heat and pressure as to form oil. Unless the idea is that they melt out of the sediments and pool, but, if that were the case, then why wouldn't the liquified bones, etc, simply continue heating until they were broken down entirely and their molecules scattered? How does oil in the arctic make any sense?
9 more posts in this thread. [Missing image file: datsmileop.jpg]
sin x = 1/sqrt(2) I know its eventually: x = pi/4 But a step-by-step would be nice.
6 more posts in this thread. [Missing image file: article-0-02BD53320000044D-753_468x301.jpg]
So I re-watched the Jurassic Park film trilogy recently and I thought... is it really possibly to clone dinosaurs using frog DNA and blood from a mosquito encased in amber from the Jurassic period? Why can't we do it already? If we can't do it, is there any other way?

Chromosomes

18 more posts in this thread. [Missing image file: chromosome.jpg]
If scientists ever found a way of manipulating chromosomes, could this lead to a possible cure for down's syndrome, autism, and aspergers? Hell, could this lead to humans finally having the ability to modify themselves to how they desire by changing their race, gender, and possibly even their sexuality?

Heine Borel and nutty intervals

0 more posts in this thread. [Missing image file: 1-s2.0-S0315086003000028-gr001[1].jpg]
Yo /sci/ so whilst learning about topology I got up to the section on the general definition of compactness. For a bit of context I thought I'd have a look at Hardy's proof of Heine-Borel. One of the examples Hardy gives us is the set of all closed balls centre p/q rational in [0,1], radius ?/q^3. Obviously for some values of ? this is a closed cover of [0,1]. Then he tells us to consider the maximum length of a finite subcover: Turns out this is 2?*(1+1/2^3+2/3^3+3/4^3+...). Obviously the series converges to a finite value, so for sufficiently small ? this is less than one. Thus we can't find a finite subcover so we can pick a ?>0 such that the set of intervals doesn't cover [0,1]. I must say, I guess it's sinking in but feels highly counterintuitive - you'd think you could, given any r in [0,1] find an interval of that form for any ?. So my question is, /sci/, what is the maximum possible value of ? for which we won't have a cover? And which values will be missed?
7 more posts in this thread. [Missing image file: 1371911339629.gif]
Learning about the birthday problem in my stats class. According to all the mathematicians, having 366 people in a room warrants a 100% probability of having 2 people with the same birthday. I say this is wrong - what if you have one person born on February 29th? Checkmate, PhD's
12 more posts in this thread. [Missing image file: matrix1.gif]
I didn't have an education growing up in extreme destitution. I didn't even attend school until I was 14. I'm in university now (passing math literacy tests and getting my HS diploma) at 23. Everything I've been learning thus far has been a smooth entry into my brain. Everything is going great, but I struggle with the rudimentary maths you must have learned in late childhood. Basically I can do calculus, matrix manipulation, logic, etc but I struggle with stuff like Pythagorean theorem, factoring, combinatorics, etc. I just finished my first matrix test today and it went smooth except for one problem. I had to solve for a product of three matrices and the final question was "solve for k in the product", the product being 4k^3 + 12k^2 + 4 = 0. I flubbed the question because I didn't know how to factor things out and solve for k. This may sound stupid as shit, but can /sci/ suggest some elementary math texts I can quickly catch up in my weak spots?






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