Archived threads in /sci/ - Science & Math - 144. page

>>9124221
The results will always be dependent on mesh size, but they should gradually converge to a certain equilibrium value. You just have to estimate what that value is by plotting convergence. Also what program are you using? Uniform meshes are really inefficient.

>>9124256
Reminds me of femm but I only used that for modeling electric motors lol

>>9124221
Thank you for your answer!
Yes, I know that it's always dependent on the size, but the difference between average velocities in the two last step wich converged is about 100 mm/s, while the maximum velocity in the system is 2 m/s, so i think it's quite big.

I'm using COMSOL Multiphysics 5.2a. The system is basically an inverted version of a magnetic mixer.

The capsule here is on the top of the dish, rotating, and I'm interested in the velocity profile at the bottom of the dish. So around the stirring capsule and at the bottom of the dish I'm using an extremely fine mesh ~0.1 mm the maximum element size. There are 15 boundary layers coming from the bottom with starting size 0.05 mm and in every next layer it's 1.5 times thicker than the previous.

I'm using a little bit coarse mesh on the top and the side of the cylinder. there the maximum element size is 1 mm. At the side of the cylinder I'm using the boundary layers described above, the difference is only that the next layers always 2x thicker than the previous.

>>9124203
>nothing that ever happened will even matter

Who gives a fuck?

>>9124204
obviously you give a fuck otherwise you wouldn't have posted anything

keep living in your delusional fantasy world, suffering for zero reason at all

>>9124204
This. I don't get why people need meaning. The fact that you have a subjective experience is amazing enough. Go experience life anon, your experience is the only thing that you'll ever have. If that doesn't matter enough for you, why should other things.

>>9124127
Cont. The question is not even valid.

I hope this is /r/iamverysmart bait, the answer is 273 celsius. Absolute zero is a thing, and you're retarded.

>>9124140
If you can't make a difference between a point of no more movement between atoms and a point of nothingness, then you are retarded. A "zero" in temperature as in 0 Celsius is not the same as in "Zero" Kelvin. Again, make a difference between ratio and interval variables and don't play smart.

Organic Chem as a Second Language by Klein

Then once you read that,
Grossman has a book on writing mechanisms.

You honestly don't have to read the assigned textbook

>>9124115
the assigned book after doing some digging to try and find a old slyb, is 9th edition of organic chemistry by Francis A. Carey, Robert M. Giuliano

>>9124115
This honestly. Just grab any cheap ochem textbook and this, follow with ochem as a second language

>>9123865
>When we add these formulas

>>9123869
i can't understand how he did that

>>9123876
if you don't know how to add you probably shouldn't be in a calculus class

File: IMG_0152.png (115KB, 491x503px) Image search: [Google]

115KB, 491x503px

>>9123826
Differential equations and PDE's are apparently essential to my chosen acedemic path aswell (theoretical ecology) I have no idea how they work but I've seen what they are used for. Modeling systems, computational modeling makes sense.
I just wish physhits and math autists would give ecologists the respect they deserve. https://www.researchgate.net/figure/279961058_fig1_Fig-1-Wave-equivalence-between-physics-and-ecology-a-Graphical-summary-of-stationary
What really pisses me off is I get all of this at a conceptual level and have yet no idea how to into maths

being able to take a derivative or to integrate a function is the half of the skill of calculus. It assumes you have the function to begin with.

Differential equations is the other half of the skill that lets you make the function based on the differential measurments or assumptions.

The two halves are inseparable from the start. It is just that, like multiplication and division; like multiplication the derivation and integration is a determined algorithm, while like division. differential equations requires trial and error and a lot of tricks.

Differentiation and Integration start with the function and give you information on how it changes. Differential equations starts with the differential changes and gives you the function.
Sometimes...

>>9124619

As for why it is under computation, because that is how we do calculus nowadays.
You never get the function. You simply get the answer for the starting parameters you enter and it is solved numerically by taking lots of little steps billions of times.

>>9123812
Immersion in a fluid of similar density to human tissues. Already proven at 32 Gs for 25 seconds.
http://www.airspacemag.com/history-of-flight/the-g-machine-16799374/

reduce the amount of g forces

cyborg bodies

Bernoulli itself can be interpreted as the conservation of energy (by applying the first principle)
i think you got the pressure wrong at A

It's not known for sure how siphons work.

>>9124615
tubes

File: 1460408552439.png (48KB, 1121x798px) Image search: [Google]

48KB, 1121x798px

Ah, cool

>>9123710
You mean the particle horizon? That's not a black hole. Black holes are (once you are inside) a singularity towards which all timelines end, in the future, sucking all the energy.

If anything, the particle horizon is the exact opposite of a black hole, being a singularity from where all timelines begin, in the past, and from where all the energy comes from.

>>9123710
so whats beyond the blackhole exactly?

Is it worth going for Masters, or should I take the the first degree and run?

>>9123641

I am hoping to get a free CS degree from my autism. (everyone point and laugh)

>>9123768
If you wanna do research a masters is nececary.

They did, it's called T*rkey

File: Australian culture.gif (3MB, 500x253px) Image search: [Google]

3MB, 500x253px

>>9123635

>>9123635

they may have invented pottery by now

>>9123604
Study some basic fucking biology before you post.

>randomly throws the term organic chemistry

>>9123611
> something something well known xkcd cartoon

File: TiqzIP5.jpg (241KB, 1082x785px) Image search: [Google]

241KB, 1082x785px

>>9123604
But... what about the giant breast you cannot see?

Brainlet detected
Time isn't real it's just one big moment

already been done

>>9123599
why can't i see what happened now then

>>9123602
give me the footage please

>>9123523
Nope. Evolution chooses what works, and size worked in that age. Dinosaurs had tiny brains, and we only gained intelligence because we're pack animals that need to communicate and can readily experiment with and manipulate the world through the use of our hands.

Communication came from our being social as a hunting & defense strategy, and hands came from us living in trees and hanging on to the branches, same as birds' zygodactyl feet. These experimentation & information-sharing tools came together to allow humans to comprehend abstraction, and the invention of the word was truly the experience that gave birth to the human spirit. It's why "the word" came first in many ancient religions, including in the Bible. Without fine manipulation and communication, you do not have the word and therefore do not evolve intelligence.

File: Pigeon_on_high_tension_cable.jpg (107KB, 513x768px) Image search: [Google]

107KB, 513x768px

They have.

>>9123552
Your views on evolution are very humancentric

kek Crower chickened out

Is potholer /ourguy/?

I just posted this because the ass heads from /pol/ always post "louder with Crowder" shit when there is something about climate science here.