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/sci/ Science & Math

Threads added between 2014/01/25 22:00 and 2014/01/26 04:00

30 more posts in this thread. [Missing image file: love-162v.jpg]
Does "love" truly exists? Or is it really just lust?
37 more posts in this thread. [Missing image file: 46_wtc1spiretodustjg4.jpg]
How does this happen?
17 more posts in this thread. [Missing image file: 1723558_10153759105465183(...).jpg]

Are dolphins conscious?

192 more posts in this thread. [Missing image file: 1390697983283.jpg]
Hey /sci/entists, biologists and neuro/sci/entists, Are dolphins and whales conscious? Are they self-aware? How smart are they can can we calculate their IQ, for example? This just from India: >India Declares Dolphins & Whales As ‘Non-Human Persons’ >It was a great day for animal rights activists around the world when India’s Ministry of Environment and Forests agreed to ban the use of dolphins and other cetaceans such as whales and porpoises for public entertainment and forbid them from being held captive anywhere in India. http://www.collective-evolution.com/2013/09/17/india-declares-dolphins-whales-as-non-human-persons/

Matlab Help

5 more posts in this thread. [Missing image file: rescale.png]
Okay, so I'm taking a matlab course and I'm juusst getting started with it and I'm not used to the syntax yet. I'm supposed to create a 3 dimensional matrix with dimensions M*N*P and each ith page is going to be multiplied by i*10. So the first page of the matrix would be multiplied by 10 and the second by 20, etc. This is to be done without loops. So for creating a random 3 dimensional matrix part, I have this: M = randi([5 10], 1); N = randi([5 10], 1); P = randi([20 30], 1); Y = round(-10 + (10 - (-10)).*rand(M, N, P)); And I know that I need to have another matrix of the same dimensions (where each page would be composed of the number of the third dimension times 10) and multiply it by the first matrix. I have this so far: sz = size(Y) S = 10*ones(sz) ^ this creates a matrix of the same dimensions, all full of 10 but how do it get each page to be scaled by the page number. Any ideas? I was thinking of creating a 2d matrix and using reshape to make it into a 3d matrix but I'm not sure how exactly that would work either.
25 more posts in this thread. [Missing image file: rogue66.jpg]
It's really frustrating to me how people... way too many people... don't believe in psychology or cause and effect. They want to be "normal" so badly. They want to believe that their uniqueness comes from their souls, they weren't influenced by anybody that raised them at all, and that they'd be the exact same person with any other parents. So they deny, deny, deny... it's like pulling teeth for 20 minutes trying to get to the root of their problem and why they hate their mom or dad. And they don't want to take ANYBODY'S advice! You try to teach them that people aren't born with personalities and babys don't know shit about anything... and they go, "no dat's not right, stupid faggot!..." or "DAT'S INSULTING!!" We should be teaching psychology in school and showing them case studies and statistics that show the patterns that arise! How can we fix anybody's problems and turn them into better people if they think that their personalities were set in stone, their negative qualities are inbred, and nothing will ever change them? So they're just going to be shitheads for the rest of their lives and go other and be shitheads to other people and to kids so they can make a new generation of shitheads.
128 more posts in this thread. [Missing image file: equations.jpg]
I'm new to 4chan but I am a professional mathematician. I'm curious to know, are there good mathematicians on this forum who will be able to discuss high level problems, or just college level mathtrolls? Can anyone prove themselves to me by solving this problem: - - - - - - - - - - - - - - - - - - - - - - - There are some pairs of integers (n,m) such that both n divides m^2+1 and m divides n^2+1. The pair (1,2) is an obvious example since 2 divides 1^2+1 = 2, and clearly 1 divides 2^2+1 = 5. Prove that there are infinitely many such pairs.
92 more posts in this thread. [Missing image file: IMG_152600370345318.jpg]
I really do find it funny how simple physics such as (pic related) people start questioning it saying its 'fake'. Does /sci/ feel the same about these people?
132 more posts in this thread. [Missing image file: fag.jpg]
What pop-sci personality do you hate the most? Pic related.
8 more posts in this thread. [Missing image file: 1000px-Standard_Model_of_(...).png]
No one outside of physics knows what a boson or a gluon is. Why are the electron, proton, and neutron seemingly sufficient to describe all of chemistry and chemical interactions? What are the applications of all these other particles? Will chemistry students in the future learn about quarks, bosons, other leptons, etc. as part of their basic understanding of the atom?
14 more posts in this thread. [Missing image file: analitic.png]
/sci/ help an undergradutate math student here. I need to find the coordinates of point O through analytic geometry where O is the centroid. I'm only given the picture and the coordinate system {A;AB;AC} as shown in the picture. Been getting a lot of equations but none work.
43 more posts in this thread. [Missing image file: 137347154525.jpg]
Even though I'm not a religious man, I pray to the lord Jesus Christ my savior that there's a stats guy lurking. Anyone have any idea how to test if two circular distributions have unequal means, while including a co-variate (analogue to the linear analysis of covariance)? I found the following paper, which presents a modified Watson-Williams test: http://www.tandfonline.com/doi/abs/10.1080/03610920801893962#.UuQOu2dgWpo It'd be great if you could let me know which section is the relevant one, and in particular, which equation. I'd at least have a place to start trying to understand it all.
31 more posts in this thread. [Missing image file: images-7.jpg]
>How much does air resistance effect the falling speed of two object of the shape and size but different weight? Just asking because Galileo's Leaning Tower of Pisa experiment, the story of the iron cannonball and a wooden ball is taught in schools everywhere to dispell the idea that heavier objects fall faster but few teachers actually bother to clarify that different objects only fall at the same rate in a vacuum. Pissed me off a lot as a kid.
9 more posts in this thread. [Missing image file: caul.jpg]
Can we get a thread going on the conspiracy theories of Isaac Newton regarding his suspicions of the Catholic church?
3 more posts in this thread. [Missing image file: EM_Spectrum3-new.jpg]
Question about the nature of sound and light. Now I know both are waveforms, but they differ vastly in the way they operate. But in either case the human eyes and ears have a limited range. That is, Audio frequencies between .2 and 20 kHZ is what we percive as Sound while EM frequencies between 400 and 789 THz are what we percive as sound. Now my question is, given an EM freqnecy set within our audible range, could we hear it? And vice versa. That is , say for example, an EM Frequency of 3 kHZ, in the ULF band of the spectrum, would we be able to hear that as an 8th octave or the like?
3 more posts in this thread. [Missing image file: 6a00d8341bf7f753ef0154377(...).jpg]
Just finished an astronomy class, learned about nebulas and shit, but I've got a question. If you had a suit on for live preservation and another astronaut in a suit next to you, in a nebula, nix the radios, could you hear each other? Would the particles and atoms be close and dense enough for sound to carry?
1 more posts in this thread. [Missing image file: JacobLawrence.jpg]
Hey guys, I'm studying for my upcoming calc. class. I'm reviewing some topics, as my memory is a little hazy on some of the shit I learned in algebra. I'm reviewing logarithms, and I don't understand this: cancellation property: a^loga(x)=x, x>0 I understand that it cancels out, by why is x>0? pic unrelated
12 more posts in this thread. [Missing image file: universe.jpg]
What shape is the universe? If you traveled endlessly in one direction, would you reach an end? or loop back on yourself? These are simple questions so if I see mumbo jumbo answers I'll take it as "nobody knows".
3 more posts in this thread. [Missing image file: st.png]
Sup /sci/ If the Star Trek universe happened in real life, based on the current political state our world is in, Would that universe be friendly like that of Star Trek TNG or more along the lines of the Mirror universe?
6 more posts in this thread. [Missing image file: 0x600[1].jpg_fit=scale&am(...).jpg]
Ok /sci/entists I had tough life while growing up, with abusive parents, barely qualified as parents. My mother inherited money from her dad when he passed away, and she never saved any of the money to put my through good university. Just like most people I am in community college. The community college I am attending is not even that bad its huge for a community college. But my question is I am working dead end job. I am working with this one associate who bitches more than a teenage girl. I am sick of it, and how can I put any effort into my engineering major if I have to work more hours a week then I put into school? Anyone else in this situation? If so, how are you dealing with it?
13 more posts in this thread. [Missing image file: index.jpg]
What is more energy efficient; a 2,000 watt kettle running for 1 minute to heat water for a hot water bottle that stays warm for 4 hours, or a 50 watt electric blanket running for 4 hours?
10 more posts in this thread. [Missing image file: 20140102_194248.jpg]
http://themindunleashed.org/2014/01/scientific-proof-thoughts-intentions-can-alter-physical-world-around-us.html What the fuck am I reading? Are there people who actually believe this?

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