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/sci/ board - Science & Math - May 2014

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Most viewed threads in this category

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http://www.iflscience.com/physics/scientists-create-most-powerful-acoustic-tractor-beam-date
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Sup /sci/Im an aspiring med... 16 posts and 0 image replies omitted. Click to view.
Sup /sci/ Im an aspiring med student hoping to get in next year, and im assembling a home chemistry set. Its mainly to solidify my knowledge of chemistry, but also for perhaps a few household applications. What should I put in my kit? And are there any particular experiments/applications I should think about? Dos/donts also appreciated So far, I have: NaOH: ceramic/glass oven tray cleaner (for burnt on stains/hardcore grease elimination) Vinegar/acetic acid: Rust treatment of various fucked up, rusty tools I have around house
ITT we post pseudoscience... 32 posts and 0 image replies omitted. Click to view.
ITT we post pseudoscience bullshit that even educated people believed until relatively recently. I'll start. http://en.wikipedia.org/wiki/Spontaneous_generation
Hey /sci/, I could really use... 0 posts and 0 image replies omitted. Click to view.
Hey /sci/, I could really use some help here. I'm trying to compare the binding affinity of a ligand I found for a protein with the affinity of an inhibitor for a similar protein. I have calculated the Kd value of my ligand using free energy, but the other protein only has an IC50 value for its inhibitor. Now, I think can convert IC50 to Km or Ki, but how do I justify comparing either of these to the Kd?
how can /sci/ deny that not a... 4 posts and 0 image replies omitted. Click to view.
how can /sci/ deny that not a god did this and gave us eyes to see it, no?
How does one acquire an... 3 posts and 0 image replies omitted. Click to view.
How does one acquire an analytical mind? Can it be induced with training? When it comes to solving problems my brain just panics and does not follow any sort of rational steps to try and arrive at a conclusion. Am I mentally defective? I'd like to be more math literate but it seems higher math is out of my reach, since I can only learn and memorize to solve problems mechanically, instead of deducing an answer. tl; dr I'm fucking stupid.
Hello guise.I have made a... 3 posts and 0 image replies omitted. Click to view.
Hello guise. I have made a digital questionnaire (test) in Word 2007, using text and combobox fields. Now, I know it's possible, but I'm sadly not really good with Visual Basic (as the VB component in Office is, I suppose, how I could make a button in Word to do the following task): extract all the entered data into a spreadsheet, which I could use in SPSS for analysis. This would greatly improve my speed and completely avoid typing errors. Do You people have an idea how to achieve this? I've found this: http://www.vbaexpress.com/forum/showthread.php?39654-Exporting-data-from-content-control-fields-in-word-to-excel-2010 But sadly, I don't understand shit. Are You willing to help a bit out? All I can say is that I am willing to learn, as I would use and tweak this feature in the future as well. I hope it's not necessary to understand the whole VB language to this work. Pic related, it's a screenshot of the questionnaire, so You know approximately how I'd like my data extracted (a spreadsheet with columns of labeled variables, into which I could add further lines from further questionnaires). (Or is there a better and easier way to do this?)
Tell me about your Ph.D 27 posts and 0 image replies omitted. Click to view.
Tell me about your Ph.D

What is this graph algorithm called?

What is this graph algorithm... 6 posts and 0 image replies omitted. Click to view.
Let's say we are at the node A and there are nodes B and C connected to them. At first, A is selected and marked as visited. Then, B and C are selected *simultaneously* and are also marked as visited. What is this graph algorithm called? Is there such an algorithm at all?
Guys I'm desperate I need... 16 posts and 0 image replies omitted. Click to view.
Guys I'm desperate I need to pass linear algebra. Its my last math class as a comp sci major. I passed calculus 1 and 2 with A's then I passed discrete math with an A- and now I'm taking linear algebra and I have a C- my final is in a week. If I get a C I will pass that's all I need is a C. So I'm going to bust my ass and go all out studying. Here's my issue I can do all the computation ( row reduction, determinants, projections, orthogonal projections, diagonalization, eiegnvalues and vectors, complex eigenvalues and vectors, etc.) You name it if its computational I can do it. But who cares its all super easy computation anyway. Now what is killing me is the abstract theoretical stuff. Example "B is an orthormal basis for matrix A. Is A symmetric?" My book has a theorem that says if a matrix is symmetric then there exists two eigen vectors from different eigenspaces that are orthogonal. So I have a ton of trouble determining the answer with theorems that are indirectly related. Im studying hard and I'm desperate. How do I study for this final?
Is psychology a science? 17 posts and 0 image replies omitted. Click to view.
Is psychology a science?

domesticated crows

domesticated crows 4 posts and 0 image replies omitted. Click to view.
do you think crows could be trained to pick trash up? maybe initially teach them to pick trash up, bring it to a receptacle, and then fly back to the trainer for food or something? i know crows remember human faces and have learned to use currency and all kinds of useful things, they seem clever enough, does anyone know of any efforts to 'put crows to work for us'?
What would have happened if he... 19 posts and 0 image replies omitted. Click to view.
What would have happened if he had deployed his parachute just a few seconds after jumping off from this point?
What are considered to be some... 6 posts and 0 image replies omitted. Click to view.
What are considered to be some of the most "fun" disciplines of mechanical/chemical/materials engineering? Money isn't an issue.

Quantum physics and consciousness

Quantum physics and... 19 posts and 0 image replies omitted. Click to view.
I tought about this today. After reading about the aura of people and the fact that people's very will of something can physically modify the thing, by toughts and will only. As suggested by Dr. Korotkov on his work about the fact that people can change the world by using their energy, I came to the following question : May consciousness be the key to quantum physics ? As an exemple, a quantum bit (computer science related) can have the value of 0 AND 1 instead of a regular bit that takes 0 OR 1, may the consciousness change the value of the bit depending on what the person in the room is willing the bit to be ? ( I WANT THIS BIT TO BE 1; bit becomes 1/// I WANT THIS BIT TO BE 0; bit becomes 0) ? I know this is highly theorical, but I want to have a constructive discussion and learn about something that interests me. Thanks ! J.A
If I minor in math by the time... 5 posts and 0 image replies omitted. Click to view.
If I minor in math by the time I get my bs in CS, should I go ahead and try to major in pure math? Would it open up any more career windows?
Anyone know a good... 20 posts and 0 image replies omitted. Click to view.
Anyone know a good video/site/whatever explaining orbitals? More specifically this thing in the picture.
In /sci/'s opinion, which... 2 posts and 0 image replies omitted. Click to view.
In /sci/'s opinion, which fields advanced mathematics should a respectable theoretical physicist, which ones a respectable mathematical physicist be able to handle? My small list: Theoretical Physicist: -Advanced Group Theory, including Representation Theory and Lie Groups- and Algebras -Basic Functional Analysis, including Hilbert Space stuff, basic spectral analysis, Fourier Analysis and Distribution Theory -Basic knowledge in Calculus of Variations -Basic knowledge in complex analysis -Basics in Differential Geometry For the mathematical physicist of course all of the above, and furthermore: -Topology -Advanced Functional Analysis Stuff, including PDE theory, advanced spectral analysis and more depending on the area of expertise -Basics in harmonic, geometrical and convex analysis -Algebra and homological algebra, more depending on the area of expertise: Algebraic geometry and computational algebra -Advanced knowledge in differential geometry, Riemannian and semi-riemannian manifolds, more depeding the area of expertise: e.g. symplectic geometry, kähler manifolds and stuff like that -Depending on area of expertise: Advanced probability theory, ergodic theory What did i forget? What is maybe too much? I am curious for your suggestions!
If everything had the same... 9 posts and 0 image replies omitted. Click to view.
If everything had the same density, how would we know whether gravity existed?
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