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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: 1354082802317s.jpg]
Sodium chloride is an ionic compound. How can you account for any observed differences in conductivity between dry and dissolved sodium chloride?

Science Math

0 more posts in this thread. [Missing image file: Koala.jpg]
x^4-y^4 factor. please help

Master Thesis

2 more posts in this thread. [Missing image file: vlok2.jpg]
Hey, I'm a graduate student who's studying Bio-Science Engineering, major in Chemical Engineering and Bioprocess Technology. I have a little dilemma in the chosing of my masters thesis, and maybe you guys can help me. I'm interested in modelling systems and using this knowledge in things like process control, optimization,... Two professors have offered me several subjects, saying I can choose whichever I want if I do my thesis with them. One is working on continuous models based on PDE (cfr. CFD, bioreactor models,...) while the other is working on discrete models based on cellular automata (cfr Wolframs 'A new kind of Science). The first kind of models has already an established amount of knowledge so the subjects would be more applied, for example setting up a model for a waste water treatment plant. PDE's offer a lot of limitations in the model complexity however and sometimes offer bad approximations. The CA models are relatively new, so the subjects in this niche cover 'simpler' things like the modelling of a chemical reaction, which would still be rather complex but not as complex as an entire bioreactor of course. The goal here would be to build a model from scratch, as CA-models have no established protocols (yet). It would be more a research 'in the unknown' but would ofcourse also be more difficult because of this, and literature would offer less support. Has /sci any thoughts for me to help me make my decision? If you need more information, ask away.

WiFi n shizzlee

4 more posts in this thread. [Missing image file: PKR_moechumad.jpg]
So is WiFi bad for our health?
8 more posts in this thread. [Missing image file: 1350569850766.jpg]
Why do you guys hate the liberal arts?
8 more posts in this thread. [Missing image file: molten-earth.jpg]
How much energy do I need to melt the entire Earth (and to boil away all the water)?

WTF?

6 more posts in this thread. [Missing image file: .png]
So I'm sure this is going to be blindingly obvious once someone points it out but I cannot get this what so ever. Surely x^2 cancels itself and you end up with E=-1?
3 more posts in this thread. [Missing image file: goldbloom.jpg]
When an opinion poll calls residential telephone numbers at random, only 20% of the calls reach a live person. You watch the random digit machine make 15 calls. What is the probability that at least 3 calls reach a person? What is the probability that more than 3 calls reach a person?
5 more posts in this thread. [Missing image file: img_816.jpg]
I have a crude soap made from castor oil with NaOH. The pH is 12 and I though I would lower it with acetic acid. How do I go about this? Should I just heat the soap in water with the acid and then salt the thing out? Or would just curing and storing the soap reduce the pH?
79 more posts in this thread. [Missing image file: dav_soc.jpg]
So this guy lived to see 70 eating only but bread. Many others lived to 90 on the same diet. Tell me why I'm eating anything else than carbs again?
197 more posts in this thread. [Missing image file: history.gif]
If life ever developped sentience before mankind, wouldn't they have had a huge time span to reach Earth at least once in the past 1.9 billion years? Just considering the possibility of near to c speeds of interstellar travel they would have had 950 million years to get here. So we can be fairly certain that there is no intelligent life, or an interstellar civilisation in a 950 million lightyear radius around Earth. If we assume the highest speed achievable with engineering would be half the speed of light that would mean there is absolutely no life in a 425 million light year radius around Earth. It would take 950 million years for light of Earth to reach their planet and then they would travel for another 950 million years if they master near c relativistic speeds. If they only master half the speed of light that would mean light from Earth would take 633 million years to get to their planet and and they would need 1267 million years to get to Earth. If we consider any advanced civilization to achieve at least 0.005% c at one point in their history then we can assume that in a radius of about 94.9 thousand lightyears around Earth there is or was no other technological civilization ever.
26 more posts in this thread. [Missing image file: 1355918036229.jpg]
Why is it that fapping in the morning helps wake you up but fapping at night helps you fall to sleep?

Worst calculus

1 more posts in this thread. [Missing image file: hell.png]
Hey /sci/ What's the worst calculus you went through or made you give up? Just found mine: \lim_{x \rightarrow +\infty}\cosh{x}^{\sinh{x}}-\sinh{x}^{\cosh{x}}
4 more posts in this thread. [Missing image file: images.jpg]
Hey there /sci/. I don't know if this is the right place to ask, but i need help. Can any of you explain to me how does the rand() function work in C? I mean, how does its code works, not how to use the function. Thanks in advance.
6 more posts in this thread. [Missing image file: Calcium_unter_Argon_Schutzgasatmosphäre.jpg]
What you guys' opinion on calcium?
2 more posts in this thread. [Missing image file: illusionpeak.jpg]
>>444512889 So, since this could never happen, according to the scientifically minded, what we're looking for is basically an escape. A realistic alternative for those who wont or cant take ascension seriously. >10 billion people >more every day >limited resources >less every day >limited capacity of the planet to support life >more polluted every day begin the discussion of timeline for cybernetic technology to arise so we may escape our polluted bodies and planet >before its too late
8 more posts in this thread. [Missing image file: 2010-07-15_euler_identity (1).jpg]
Anyone else have their mind blown with power series? Isn't it incredible how this formula is true?
4 more posts in this thread. [Missing image file: UK-education.gif]
Is a MSci degree considered a full masters degree? And would it be unnecessary to follow it up with a standalone Msc degree?

Stats and busstops

5 more posts in this thread. [Missing image file: 089-Normal-Distribution.jpg]
Any other examples of seeing gaussian curve in so pure form in nature?
5 more posts in this thread. [Missing image file: calculus2[1].png]
Hello, /sci/. Is it possible to get a basic understanding of multivariable calculus in roughly 5 weeks? I'm about to enter my second semester at a university studying physics. I just took calc 2 and got a near 100% in the class. I'm taking multivariable calc and linear algebra at the same time next semester and I have absolutely nothing to do over winter break so I was considering self-learning one of them to get a bit ahead. Is this manageable or should I just wait for the semester to start?






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