Archived threads in /sci/ - Science & Math - 203. page
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If we can detect light coming from all directions going back the exact same amount of time -however many billion years.
Then how can we possibly assume the universe is only as big as we can see.
The odds of us being exactly in the centre are 0.0000000000000000000000000000000000000000000000000000000000000000000
Therefore why havent we accepted the universe extends beyond what we can see?
> Then how can we possibly assume the universe is only as big as we can see.
Tell me which scientific statement says that ?
>>8013096
i never hear people talking about how it probably extends a ridiculous distance past what we can see.
At this point i feel we can definitely say it is bigger than what we can see.
>>8013096
reddit is always going on about the universe being that big and all these facts and stories how big the observable universe is.
hey /sci/,
can someone help me with discrete Fourier transform?
i have a data set. It is produced by skin conductance sensor readings. A Java program periodically samples the signal produced by the sensor through a microcontroller.
The Java program stores the data in a 1D array. But I suspect the sensor data has a lot of noise in it.
Will finding the DFT (to convert the data from time to frequency domain) help me to isolate the signal among the noise? Like, just calculate the DFT for all the data and then plot the power spectrum? Will that show me...
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>>8013019
Why don't you just do it and see what happens? Do you actually know which frequency you're expecting the desirable portion of the signal to show up at?
>>8013026
unfortunately, i don't know what I should be looking for. but I figure this might be better than nothing for my project.
i guess i'll try it.
>>8013036
Yeah, just plot it and see what happens. Hopefully you can narrow down the signal to a range of frequencies, and hopefully that range of frequencies is nicely separated from the power spectrum of the noise (probably not). Then you can just do something simple like a high/low/band pass filter. If that doesn't work, you can always just try a sliding average/freq-domain sinc filter.
What is the Psychology behind pop music?
music for brainlets
>>8013002
The science behind its success is the fact that exactly half of all people are dumber then the average person.
-simple,memorable beats
-relatable lyrics (to the average mediocre person)
And that's it,actually
Yes, this is a food thread, this global problem is directly caused by scientists and psychologists - yet you all refuse to take responsibility - indeed you laugh as millions get sick or die.
70 years ago food scientists advised governments that eating fat caused obesity. They ignored sugar and conspired to discredit anyone who suggested carbohydrates and sugar were to blame.
This dismissive attitude extended into psychology and psychiatry. Anorexia is a recognized mental condition whereas 'obesity' is not.
We the general public are the victims...
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stop eating fatty
>>8012943
>Americans
Just eat less calories you hamplanet
>>8012943
The only way you can get fat is if you eat more calories than you burn.
The solution then is simple: stop eating so much you fat fuck.
Are there any examples of clear, transparent non-Newtonian fluids?
>>8012893
precum
>>8012893
glycerin
polymer melt
silicone oil
...
https://en.wikipedia.org/wiki/Non-Newtonian_fluid
>>8013685
What about something less viscous?
What can look like this, but be even more thicker and firmer
https://www.youtube.com/watch?v=sSl3M6uVB18
You have 10 seconds to explain what a Banach Space is
>>8012869
>this again
It's a space that is "complete" in the sense that every sequence of points that gets "closer" to each other at the sequence goes on converges to some point in the space. This is useful because you can talk about points in this space by constructing a sequence that converges to that point.
>>8012872
More than 10 seconds. Next.
Hey, /sci/, I need a function that allows me to do exponentiations.
a^b
I already did it, but it only works raising any base with ONLY whole numbers. I need to operate bases with real numbers.
Here's the code I did for only whole numbers at the exponent:
double pow(double b,double e){
double x=b;
for(e;e>1;e--) {
x*=b;
}
return x;
}
Sorry about my english.
http://opensource.apple.com/source/Libm/Libm-315/Source/ARM/powf.c
>>8012483
Too advanced for me.
>>8012499
well it's a real-world power function
>be 18
>be in high school engineering class
I've gotten really into programming and math in the last year. Is computer science still a relevant field to go into?
>>8012450
Yes but its becoming saturated with absolute mongoloids because they recognize that it's still relevant.
>>8012472
True. I wish the media didnt make a big deal when there is a need for careers. Makes shit too oversaturated
>>8012482
My advice to you is that if you're REALLY into it, like REALLY, go into it. Your passion will probably lead to you being able to being better at it than the plebs who go into it for social capital or money. It's still very relevant with tons of interesting specializations.
What do you call the notion that a very small change in some physical/other system can produce radically different outcomes over the long term?
margarine mosquito affect
Chaos theory is exactly what you are looking for
Susan
http://wormlab.biology.dal.ca/publication/view/boyce-d-lewis-m-worm-b-2010-global-phytoplankton-decline-over-the-last-century/
>Since measurements began in 1899 global phytoplankton levels have declined, on average, by 59% and continue to decline by roughly 1% every year - and the rate of yearly decline is increasing
>The decline is worst in high-latitude oceans (>60 latitude) where rates of decline are 78-80% of pre-industrial phytoplankton levels
>The study generated debate among...
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>>8012325
Because most people don't understand or care.
I don't know if I'm reading that shit right, but is the southern stuff increasing and the northern decreasing?
>>8012432
Unsure of how to read the graphs, am quoting the actual text from the paper.
>>8012436
I was just looking at the last set of graphs.
I live in Indiana, and right now to the left of the moon a star is visible.
What is it?
have you ever seen such a big boobed slim redhead irl?
(I can't help you with your question, the pic just seemed off)
>>8012287
probably venus
>>8012287
Jupiter
If our mind was to process information faster would time go by faster or slower?
>asking comparatives for an incomparable situation
>>8012250
time passes at a stable rate of 1s/s for everyone. if we could process information faster then we would make faster decisions. if you want to say time moving at a different "speed" you need a temporal dimension external to "our" "time"
faster. like flies make those computations much faster due to their shorter circuits and less complex computations, so they're said to experience time 40 times slower than us humans. So whenever a fly sees you striking, it sees you very slow motion and has a lot of time to think it through.
How do I learn what this shit means?
>>8012206
Stop lurking on 4chan and try to learn the math behind ?
>>8012216
Stop being a dick.
OP, dont listen to him. What you need to do is lurk 4chan 24/7 until you achieve mathematical nirvana.
>>8012206
take any stats class.
I am driven mad by a lever problem. I am designing a crane in my spare time and have performed the calculations for the hydraulic actuator that manipulates the angle of the arm. I am however uncertain if my reasoning is correct - I have to apply the force to a different point on the axis, to which the actuator is fixed.
My calculations are in the image. L is the length of an extended arm, while l (small L) is the distance from the fixed end of the arm to the point where the actuator connects to it.
>>8012196
I think you should investigate rotational effects- for example, torque, before applying N2L in x and y to get the amount of force that must act perpendicularly to the arm; that makes finding your F_b for any angle beta pretty trivial. Once you know that, just solve for the forces in the x directions and you're good.
>>8012213
Oh wait, just saw the second calculation.
No, that's fucked.
F_a is
[math]
|\vec{Q}|sin(\alpha)
[/math]
and F_b is
[math]
|\vec{Q}|cos(\alpha)
[/math]
And then you can apply the "law of the lever" (really just newton's second law for rotational motion applied to a static system), but that only can tell you how much force is acting perpendicularly to the lever arm.Those vectors that you have at the end do not sum to Q
>>8012213
I have broken down the load Q into two forces acting along the hydraulic actuators - it is the only means of moving the crane arm, so the forces have to be calculated along those axes.
After having calculated Fa and Fb, I already have the force that acts along the arm. However, I still need to reapply the force Fb so that it aligns with the second hydraulic actuator.
I was under the impression that it boils down to equating the moment Fb*L*sin(specific_angle) and Fb' * l * sin(specific_angle). As...
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https://www.youtube.com/watch?v=rRmv4uD2RQ4
Well, /sci/? How accurate was Dudeweed's description of quantum computing?
Sounds to me like he's describing analog computing. Is analog data storage part of quantum computing? I would've thought the opposite; that at the quantum level everything would be... well, quantized.
>>8012084
It's more or less right -- it's obvious that someone explained to him since one of the reasons he was there was because of it, but his ability to succinctly turn the information he was given and impart it to someone else shows a lot of things about his competence as a politician.
Not like it matters though since his other skills seem to be burning millions on other things while in charge.
>>8012088
This tbqh
>>8012084
>>8012088
Of course he was given the information, and though his delivery was very eloquent I think it was pretty clear he had no idea what he was talking about. The bit where he invoked the wave particle duality really sold it for me.
Don't be an idiot. At best he's a better version of the same ol' politician. And in all likelihood it's not even that.
