Archived threads in /sci/ - Science & Math - 1261. page

>If there is anyone interested I'm here to argument about this subject. Test mme and decide if I'm bullshitting or not.
you know most people do science when they make scientific claims, not leaving it up to argument

>>8454497

If you want to read about it from PubMed wait for few years.
If you want to have an discussion feel free.

Everyone already knows how to prevent this. It's called pace yourself and drink plenty of water.

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>>8454468
If we put Time as another dimension than logically it should have movable directions. we are stuck in this bounded time called now. Which shouldn't be the case. Anyhow, Travelling back in time is not possible because that would change the history timelines of Space.

Honestly I think it's just what ScuFic writers do to fuck it up. It would not be possible to Time travel ever for humans. Period

>>8454468
Hur dur time travel is possible because we're going into the future

But I remember some physicist talking about how you can have a mass that bends spacetime in such a way that it loops into the past or something. He said that's the only way it could be possible to go back as far as we know, it could possibly have something to do with black holes.

>>8454491
>Travelling back in time is not possible because that would change the history timelines of Space.
What do you actually understand by that?

>>8454463
Here's what you do to find out:

1. You fit the gaussian pdf
2. You calculate the cumulative distribution of your data
3. You calculate your fitted cdf
4. You calculate the maximum difference between fit and data
5. What you just did is called the Kolmogorov-Smirnov test. You can look it up somewhere to find thresholds for specific confidence levels.

You should calculate errors to your data too. It should be pretty simple to do (you count shit and sort them into bins, so it's poisson statistic). If you've managed to do that, you can also do a chi-squared test:

1. You fit the gaussian pdf
2. For every bin you calculate [eqn] \sum_i \frac{x_i^\mathrm{fit} - x_i^\mathrm{data}}{\sigma_i}[/eqn]
3. You can look up thresholds etc online

Now, from the image, it's impossible to tell, because you didn't give us your statistics (most importantly, how many samples you have), you only gave us a density estimate, which is useless for this kind of stuff (really, try to avoid density estimation). It has this strange peak that makes the whole thing look like the superposition of two gaussians (one with high sigma, one with low sigma), but that's just a guess.

>>8454502
question for you since you obviously know your stats (not OP)

I was in a situation a while ago where I wanted to compare two sample sets to see if they were from the same distribution (i'm a biologist who knows just enough stats to hurt myself), and after some digging came across K-S and other related tests. I also came across some people saying things along the lines of, "tests for normality can be done, sure, but are rarely worth doing". their reasoning was something like, no comparison of empirical data is going to find exactly the same distribution anyway, and what matters is what level of difference you're willing to tolerate before you say they're meaningfully different

what are your thoughts on that?

>>8454463
>Is this a normal distribution
No, it looks like a normal (Gaussian) distro
with a superimposed (additional) triangular distro.

>>8454439
Lang's "Basics Mathematics"
Gelfand's "Algebra" and "Trigonometry"
Kline's "Calculus: An Intuitive and Physical Approach"

>>8454439
You either try to gain the interest again by reading interesting topics or switch to other things that isn't math

But hey, you took Calc!

Just one question OP: Do you have a new interests?

>>8454451
Learning lots on chemistry, I major in geology so I'd like to go into geochemistry, gain some respect in that field, then transfer to planetary geology. Analyzing meteorites to piece together mechanisms on other planets.
I've just always had a phobia of math and did not pursue it. Luckily I just run into a few integral equations but as my career advances I'm going to have to understand more math.

>>8454423
Real depression, not the I'M SO SAD XDDDx10^99

>You literally stop being intelligent or creative (neccesary shit for Mathfags)
>You have suicidal thoughts and you could kill yourself anytime
>You stop studying, get fat and lose brain gains
Literally /sci/'s worst nightmare except killing themselves since sometimes stress fucks the average /sci/entist

>>8454423
It's some terrifying shit. And you don't even need to stroke out to experience it. It can occur during a migraine aura for a couple of minutes. Had my first episode of aura about a year and half ago and those couple of minutes of being totally unable to communicate were the most terrifying of my life.

>>8454423
Hows about aphantasia. Literally having no imagination.

http://www.cracked.com/personal-experiences-2026-a-weird-brain-anomaly-took-my-imagination-away.html

Yeah, not exactly the most academic of sources, but it's a neat read.

what are you even trying to do, calculate S_n?

>>8454420
It's not gonna happen. You've pretty much got twice the partial sum of the harmonic series, which can't be simplified any further.

>>8454442
Yes
>>8454458
Ik, but my professor seems to think otherwise.

You win by not playing.

>>8454372
Pls no, c'mon, you're all mathematical prodigies and shit, give me something pls.

I swear to fucking god if I win I'll give the guy who helped me 25% of the money.

>>8454373
I hope you're trolling. If someone could do it why would they help you instead of doing it themselves?

>>8454294
Define "Space Literature"

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>>8454301

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>>8454328

“There is plenty of carbon in municipal waste water sludge and interestingly, there are also fats,” said Corinne Drennan, who is responsible for bioenergy technologies research at PNNL. “The fats or lipids appear to facilitate the conversion of other materials in the wastewater such as toilet paper, keep the sludge moving through the reactor, and produce a very high quality biocrude that, when refined, yields fuels such as gasoline, diesel and jet fuels.”

In addition to producing useful fuel, HTL could give local governments significant cost savings by virtually eliminating the need for sewage residuals processing, transport and disposal.

“The best thing about this process is how simple it is,” said Drennan. “The reactor is literally a hot, pressurized tube. We’ve really accelerated hydrothermal conversion technology over the last six years to create a continuous, and scalable process which allows the use of wet wastes like sewage sludge.”

An independent assessment for the Water Environment & Reuse Foundation calls HTL a highly disruptive technology that has potential for treating wastewater solids. WE&RF investigators noted the process has high carbon conversion efficiency with nearly 60 percent of available carbon in primary sludge becoming bio-crude. The report calls for further demonstration, which may soon be in the works.

PNNL has licensed its HTL technology to Utah-based Genifuel Corporation, which is now working with Metro Vancouver, a partnership of 23 local authorities in British Columbia, Canada, to build a demonstration plant.

“Metro Vancouver hopes to be the first wastewater treatment utility in North America to host hydrothermal liquefaction at one of its treatment plants,” said Darrell Mussatto, chair of Metro Vancouver’s Utilities Committee. “The pilot project will cost between $8 to $9 million (Canadian) with Metro Vancouver providing nearly one-half of the cost directly and the remaining balance subject to external funding.”

Once funding is in place, Metro Vancouver plans to move to the design phase in 2017, followed by equipment fabrication, with start-up occurring in 2018.

“If this emerging technology is a success, a future production facility could lead the way for Metro Vancouver’s wastewater operation to meet its sustainability objectives of zero net energy, zero odours and zero residuals,” Mussatto added.

In addition to the biocrude, the liquid phase can be treated with a catalyst to create other fuels and chemical products. A small amount of solid material is also generated, which contains important nutrients. For example, early efforts have demonstrated the ability to recover phosphorus, which can replace phosphorus ore used in fertilizer production.

liquid gold.

no such thing as an "opposite charge". it's just a naming convention basically.

protons exert an electric force on an electron in a direction towards themselves and vice versa.

the + / - makes it more convenient to keep track of everything without having to explicitly say electron or proton or whatever. also brainlets like you can understand it.

>>8454233
Because our observations say so.
Do the Feynman diagrams

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>>8454240
>protons exert an electric force on an electron in a direction towards themselves and vice versa.

But Why?

>>8454190
that's either a meteor or an airplane

comets don't enter the atmosphere

>>8454190
It's a contrail. Likely formed due to a plane, but they can also form due to a meteor.

>>8454190
chemtrail

>>8454163
Delet males and call it
"Epilepsy in females"

>>8454164
but that removes 25% of my applicant pool, which consists of only 220 applicants altogether

>>8454168
Still 165 people. What's it about?

Oh crap, this is going to require us to reconsider the very foundations of modern mathematics.

>x=-x
>2x=0
>x=0
nice bait

>>8454153
[eqn] e^{2\pi i}=1 [/eqn]
[eqn] ln(e^{2\pi i})=ln(1) [/eqn]
[eqn] 2\pi i=0 [/eqn]
[eqn] \pi=0 [/eqn]

>>8454152
I-Is that vegetation?
Also >dat mist

>>8454152
There are aliens in the right hand side in the distance

>>8454152
That actually looks like Earth

>>8454104
Wow Anon i think you might need to check your calendar because you may be unaware that its THE CURRENT YEAR!

Is any field safe

>>8454104
Old news.