/sci/ - Science & Math

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Alright, what am I in for?

Anonymous Wed 11 Aug 02:17:37 2021 No.13501901 View Reply Original Report

Quoted By: >>13501949 >>13501950

3 posts and 1 image omitted

Anonymous

Anonymous Wed 11 Aug 2021 02:29:47 No.13501949 Report

Quoted By:

>>13501901
Looks like basic mathematics.

Anonymous

Anonymous Wed 11 Aug 2021 02:29:53 No.13501950 Report

Quoted By:

>>13501901
How to add, subtract, multiply, divide, etc.

Anonymous

Anonymous Wed 11 Aug 2021 02:38:49 No.13501988 Report

Quoted By:

>>13501928
Notes taken. Appreciated

Anonymous

Anonymous Wed 11 Aug 2021 03:21:24 No.13502122 Report

Quoted By: >>13502252

>>13501928
>Stewart calculus
what's the difference between the transcendental version and regular version?

Anonymous

Anonymous Wed 11 Aug 2021 04:02:36 No.13502252 Report

Quoted By:

>>13502122
No idea. I have whatever edition was the latest in 2013. I had Spivak earlier because of the memes, but I did not have the mathematical maturity for it at the time. Never looked at apostol as im not fond of calculus to begin with.

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Anonymous Tue 10 Aug 14:47:55 2021 No.13499188 View Reply Original Report

Quoted By: >>13500041 >>13500115

How do I improve my mental math skills? I am a math major and it's embarrassing when people ask for example what's 15*16 and I have to think a lot to answer. I'm great otherwise, when I have paper.

7 posts and 4 images omitted

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Anonymous Tue 10 Aug 18:04:41 2021 No.13499855 View Reply Original Report

Quoted By: >>13502084

Does /sci/ like logic puzzles? Are logic puzzles good for you?

16 posts and 2 images omitted

Anonymous

Anonymous Wed 11 Aug 2021 02:46:21 No.13502018 Report

Quoted By:

>>13501017
But it doesn't ask me to do anything

Anonymous

Anonymous Wed 11 Aug 2021 03:09:58 No.13502084 Report

Quoted By: >>13502169

>>13499855
I am a filthy brainlet. I narrowed it down to three date (July 16, August 15 and 17) but I don't get how the third sentence rules out 15 and 17.

Anonymous

Anonymous Wed 11 Aug 2021 03:39:44 No.13502169 Report

Quoted By: >>13502177

>>13502084
You rule out the 15th and 17th by Albert saying "now I know her birthday"
Albert only knows the month, so if he says he now knows the date, it can only be the month with 1 date left (July 16th) because he would have no way of knowing if it was the 15th or 17th

Anonymous

Anonymous Wed 11 Aug 2021 03:41:56 No.13502177 Report

Quoted By:

>>13502169
Ah yes, I'm stupid. Thanks

Anonymous

Anonymous Wed 11 Aug 2021 03:45:27 No.13502192 Report

Quoted By:

>>13501017
kek

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Wait wot?

Anonymous Mon 09 Aug 10:27:58 2021 No.13493523 View Reply Original Report

Quoted By:

https://mobile.twitter.com/pfizer/status/1420474141686255624

49 posts and 5 images omitted

Anonymous

Anonymous Tue 10 Aug 2021 15:07:57 No.13499262 Report

Quoted By:

>>13495720
>without requiring extremely toxic doses.

Anonymous

Anonymous Wed 11 Aug 2021 02:24:25 No.13501933 Report

Quoted By:

>>13495741
kys kike

Anonymous

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Anonymous Wed 11 Aug 2021 03:20:50 No.13502118 Report

Quoted By: >>13502124

>>13497678
>Cases drop by 150k per day in the 10 days prior to Ivermectin being recommended
Wow, it reminds of something... ah yes! Vaccines.

Anonymous

Anonymous Wed 11 Aug 2021 03:22:34 No.13502124 Report

Quoted By:

>>13502118
>Wow, it reminds of something... ah yes! Vaccines.
Really? Cases dropping reminds you of vaccines? So why'd you post a photo of deaths? Because death rate could have declined without cases declining due to better medical care.

Anonymous

Anonymous Wed 11 Aug 2021 03:35:16 No.13502156 Report

Quoted By:

>>13493692
Off my board. Now

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Anonymous Tue 10 Aug 01:44:16 2021 No.13497158 View Reply Original Report

Quoted By: >>13502040 >>13502136

Weren't the polar icecaps supposed to have completely melted by now? What happened?

26 posts and 5 images omitted

Anonymous

Anonymous Tue 10 Aug 2021 20:17:21 No.13500400 Report

Quoted By:

>>13500124
So no ice by 2040? Someone save this, and post it in 20 years.

Anonymous

Anonymous Tue 10 Aug 2021 22:24:13 No.13501067 Report

Quoted By: >>13502030

>>13500124
Are you implying the media is guilty of climate alarmism? False flag oil shill.

Anonymous

Anonymous Wed 11 Aug 2021 02:50:50 No.13502030 Report

Quoted By:

>>13500124
>>13501067
?

Anonymous

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Anonymous Wed 11 Aug 2021 02:52:58 No.13502040 Report

Quoted By:

>>13497158

Anonymous

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Anonymous Wed 11 Aug 2021 03:26:06 No.13502136 Report

Quoted By:

>>13497158
>what happened?
Al Gore and friends cherrypicking a couple of climate scientists they could find with the most extreme estimates, and then distorting their actual words.

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space elevators only exist in the minds of morons

Anonymous Tue 10 Aug 19:03:30 2021 No.13500122 View Reply Original Report

Quoted By: >>13502123

>place item in the sky
>anchor it to the ground
>the only thing keeping it from falling back to the ground is the "artist's conception" of it

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Anonymous

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Anonymous Wed 11 Aug 2021 00:55:45 No.13501590 Report

Quoted By: >>13501610 >>13501805

>>13501541
NOTES ON PLAUSIBILITY:

Adding time as a factor, the amount of energy required to power this array would be have to take kWh consumption into effect. This can be assumed to scale the power consumed roughly by number of hours spent in the air. ROUGHLY, because of the possible deployment pattern chosen (some modules will spend more time in orbit than other modules, so an average time of deployment can be taken - the main time taken into consideration is after ring completion, when it must be slowed and connected to the earth)

Overall, the energy requirements are ABSURDLY higher than any *achievable* expectation of power generation capabilities. As stated in the calculations, we would need 55.6 million hydroelectric dams, that of which are the biggest that mankind has ever created. Comparatively, with nuclear power:
>Most effective fast breeder reactor - 800 MW
>12.52*10^11 / 800 MW = 1.565 BILLION nuclear reactors.
This further shows how unrealistic of an energy requirement the deployment of a space ring calls for.

Solid fuel thrusters could be considered, but due to the nature of the space ring, a fuel tank body would negate the purpose of the ring in the first place - the body itself would not be traversable or hollow.

In conclusion, from a purely economical perspective, the orbital space ring concept that requires a stationary fixation to the planet is not realistically plausible, due to its energy requirement being that of far-fetched science fiction. Immense sources of energy such as harvesting the fusion energy from the sun or the gravitational energy from a black hole would be required, and quantum-electrical energy storing methods to power each module's sustained flight would have to be developed to match such requirements. Other types of orbital ring concepts would have to be explored.

Anonymous

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Anonymous Wed 11 Aug 2021 01:03:44 No.13501610 Report

Quoted By: >>13501805

>>13501590
POSSIBLE CONCEPTS FOR EXPLORATION:

>Using the moon as a weight for centripetal momentum around the Earth. Or using the Moon as an intermediary station for spaceship generation instead of a ring.

>Maintaining the ring's orbital speed, and instead developing large platforms that would act as surfaces to construct manufacturing centers for new spaceships. Shuttling resources to the ring from Earth would be required initially, but the supply chain could be continued from asteroid mining with relative ease.
>Such ring could be suspended still by large columns with rollers that keep the ring's shape form flexing or deviating.

>Smaller rings in station orientation could be made in geosynchronous orbit, and spun to simulate Earth's gravity.

Anonymous

Anonymous Wed 11 Aug 2021 01:55:29 No.13501805 Report

Quoted By:

>>13501541
>>13501590
>>13501610
50000 kgs a module?! anon thats not simply overweight, thats gigaobese.

calculations as per>>13500499 with your module count indicated 7.07 kg per module

Anonymous

Anonymous Wed 11 Aug 2021 03:19:10 No.13502112 Report

Quoted By:

>>13501271
>How do you transport things via. elevator if it's still *spinning*

The tether is connected via electromagnetic rail.

Anonymous

Anonymous Wed 11 Aug 2021 03:22:07 No.13502123 Report

Quoted By:

>>13500122
one part touches the earth, one part touches the moon
boom problem solved

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Anonymous Tue 10 Aug 14:43:28 2021 No.13499172 View Reply Original Report

Quoted By: >>13501447

I have an original audio file and a distorted audio file. I want to restore the original audio file from the distorted audio file. How can I do this if I have the MSE? This is for a signals and systems class. No fancy shit. I just wanna improve the distorted signal

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Anonymous

Anonymous Tue 10 Aug 2021 23:03:47 No.13501211 Report

Quoted By:

>>13501190
Sorry I'm sleepy and stupid, min and max is 22kHz. Nyquist and all.

Anonymous

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Anonymous Tue 10 Aug 2021 23:08:05 No.13501223 Report

Quoted By:

kk I tried to fix the plots. idk wtf happened by the axis retarded.

Anonymous

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Anonymous Tue 10 Aug 2021 23:11:41 No.13501230 Report

Quoted By:

I'm having trouble making the code for the low pass filter. I'm going to be using the filterDesigner tool.

So the sampling frequency Fs is 22050

What are the parameters I put it in for the Fpass and Fstop?

I hovered over the lower end of the noise and I got a value of approximately like 5564 and at the higher end I got a value of 16447.

Not entirely sure if this is correct. My axis are totally fucked.

Anonymous

Anonymous Wed 11 Aug 2021 00:17:09 No.13501447 Report

Quoted By:

>>13499172
>I have an original audio file and a distorted audio file. I want to restore the original audio file from the distorted audio file.
Subtract the original from the distorted one; then, subtract that from the distorted file. That should restore your original file :)

Anonymous

Anonymous Wed 11 Aug 2021 03:13:10 No.13502094 Report

Quoted By:

holy fucking shit

b = fir1(20,0.5)
z=filter(b,1,x)

where x is your distorted signal.

Look at the function descriptions to understand what happened. Adjust 20 up to 100 see what happens. Adjust 0.5 to 0.9 see what happens, etc. You will get a basic understanding from playing around with this stuff and plotting the yfil in both the time and frequency domain.

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Anonymous Wed 11 Aug 01:39:36 2021 No.13501740 View Reply Original Report

Quoted By: >>13502049

is comp sci boring

9 posts omitted

Anonymous

Anonymous Wed 11 Aug 2021 02:49:12 No.13502028 Report

Quoted By: >>13502036

>>13501756
I'm not from the states, what's the difference between CS and CE?

Anonymous

Anonymous Wed 11 Aug 2021 02:51:40 No.13502036 Report

Quoted By: >>13502041

>>13502028
CE = CS + EE, focused on EE
CS is CS

Anonymous

Anonymous Wed 11 Aug 2021 02:53:14 No.13502041 Report

Quoted By: >>13502054

>>13502036
thanks anon, being a EE already, what would be the core subjects to study to get into CE?

Anonymous

Anonymous Wed 11 Aug 2021 02:55:51 No.13502049 Report

Quoted By:

>>13501740
It's not boring because it's practical.

Anonymous

Anonymous Wed 11 Aug 2021 02:56:43 No.13502054 Report

Quoted By:

>>13502041
operating systems, networking, digital design / assembly language

if you need practice on coding then you may want to focus on CS/software engineering more

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Water Purification

Anonymous Tue 10 Aug 19:19:08 2021 No.13500174 View Reply Original Report

Quoted By: >>13500802 >>13502019

Are there impurities in water that could make it through solar distillation?

1 post omitted

Anonymous

Anonymous Tue 10 Aug 2021 19:22:30 No.13500188 Report

Quoted By: >>13500701 >>13502022

>>13500187
I'm kinda worried about VOCs in the plastics too since they will be at elevated temperatures.

Anonymous

Anonymous Tue 10 Aug 2021 21:21:54 No.13500701 Report

Quoted By:

>>13500188
Then don’t use plastic in your solar distillery
Glass exists for a reason

Anonymous

Anonymous Tue 10 Aug 2021 21:40:26 No.13500802 Report

Quoted By:

>>13500174
Its a fun project but economically irrelevant. Just get a normal desalinator

Anonymous

Anonymous Wed 11 Aug 2021 02:46:53 No.13502019 Report

Quoted By:

>>13500174
Yeah
Potentially the chlorine fumes from the tap water. That's the only real issue I've run into when researching solar distillation, and I don't know how to measure it.
Obv it would be small if any, but still not pure.
Still (heh), solar distillation is the best I've come up with after digging into this topic way too fucking much. There's some other interesting things I've come up with too I think

I really have no idea what's in atmosphere rain water but that's another option to source from, and can do away with the pipes which is kino

Imo
Try a bunch of distillation methods from tap water and then go visit a friend with cats and offer them a bowl of different types. See what they take to

If you dry fast for a day or two, you can taste and feel the water a lot more and you can tell when there's garbage in it or when it's right for you.

Anyone else pls share
I've been thinking about magnetizing water too
Suck my dick water carries memory and all that city water just repeat recycling over and over. Magnetize it and then "bless" it/project onto it like religious types do with food. This is not just "thanking god"

Also you can energize it by rotating it clockwise and counterclockwise, and humming or singing tones and raising or lowering the octaves.
Basically like doing do re me fa etc scales up and down

You source faggots can ligma, we getting real nigga water this decade

Anonymous

Anonymous Wed 11 Aug 2021 02:47:55 No.13502022 Report

Quoted By:

>>13500188
It's all silicone and glass

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yup

Anonymous Tue 10 Aug 18:41:35 2021 No.13500039 View Reply Original Report

Quoted By: >>13500487 >>13501215 >>13501289 >>13501979

I'm 23 going back to college for computer science, I went to college at 18 for like 2 weeks and dropped out and now I'm going back. Is this a good idea?

11 posts omitted

Anonymous

Anonymous Tue 10 Aug 2021 20:41:00 No.13500487 Report

Quoted By:

>>13500039
Well my cousin went back to school in his 30s for computer science and he had 3 boys to support. It’s possible. Try not to be a little bitch.

Anonymous

Anonymous Tue 10 Aug 2021 22:09:38 No.13500975 Report

Quoted By:

Terrible Idea, assuming you don't know how to code. You will be mogged by kids if not.

Anonymous

Anonymous Tue 10 Aug 2021 23:04:22 No.13501215 Report

Quoted By:

>>13500039
I'm 26, graduating at 27 with a Math/CS degree. It goes by fast, so don't wait on getting pet projects on github or practicing leet code. I have no idea what I'm gonna do for work as I didn't get internships, I intend to apply after graduation though.

Anonymous

Anonymous Tue 10 Aug 2021 23:28:39 No.13501289 Report

Quoted By:

>>13500039
why wouldnt it be a good idea? life has no user's guide, just do whatever you want

Anonymous

Anonymous Wed 11 Aug 2021 02:36:05 No.13501979 Report

Quoted By:

>>13500039
No.

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Alright, what am I in for?

Wait wot?

space elevators only exist in the minds of morons

Water Purification

yup