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/sci/ - Science, Technology, Engineering, and Mathematics

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Amazon’s Wireless Wristbands Can Track Warehouse Workers Sophie+Wilson 18/04/07(Sat)14:49 No. 16642 ID: 92f56e [Reply]
16642

File 152310539335.jpg - (893.78KB , 1170x660 , amazon.jpg )

The global technology market is ever-evolving, and companies have not shied away from implementing them in workplaces. Amazon too has been working to create and patent a wristband system, to keep an eye on their workers in the huge warehouses and optimize the work.
https://www.evolving-science.com/information-communication/amazon-s-wireless-wristbands-can-track-warehouse-workers-00612




Naomi "Sexy Cyborg" Wu is a liar and a fake. Anonymous 18/04/04(Wed)14:46 No. 16638 ID: aeab35 [Reply]
16638

File 15228459614.jpg - (218.01KB , 1400x1050 , C67929040DD3C711CF587E26D68EA5F3.jpg )

More evidence connecting Timaz to Sexy Cyborg Naomi Wu. This pair is using her "fame" to rip people off. They hide behind their army of White Knights and SJW feminists when anyone critiques her bullshit backstory and cry sexism instead of addressing the points made. Now they are trying to ruin people's careers. They are scumbags and the truth needs to be shared.

In this thread, user Timaz talks about his Up Plus 2 and Leapfrog Creatr

https://web.archive.org/web/20180224212900/http://3dprintboard.com/search.php?searchid=3203938

https://imgur.com/DyNZpUm

In this article, Wu talks about the same type of printer

https://web.archive.org/web/20180116013841/https://3dprint.com/185153/spotlight-naomi-wu-sexycyborg/

https://imgur.com/NNhW8yR

She also has it listed on her thingvirse
Message too long. Click here to view the full text.


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Anonymous 18/04/04(Wed)20:39 No. 16640 ID: fecce6
16640

File 152286717561.jpg - (1.18MB , 2550x1950 , liars.jpg )




Researchers Turn Fiction Into Fact By Developing Bio-Inspired Invisibility Sophie+Wilson 18/04/04(Wed)16:02 No. 16639 ID: 40a775 [Reply]
16639

File 152285056964.jpg - (441.16KB , 1179x660 , Researchers Turn Fiction Into Fact By Developing B.jpg )

phalopods, the class of marine animals including squids, octopuses and cuttefish, have a specialized mechanism of escaping from their prey or while signaling — camouflage.
https://www.evolving-science.com/matter-energy/researchers-turn-fiction-fact-developing-bio-inspired-invisibility-skin-00609




Hypothetical Question Anonymous 18/03/08(Thu)15:46 No. 16633 ID: 9469d5 [Reply]
16633

File 152052040874.jpg - (23.14KB , 512x384 , IMG_0740.jpg )

If I were to throw a paper air plane from northern Texas would the global winds more likely carry it towards Canada or the east coast?
Thanks


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Anonymous 18/03/20(Tue)02:39 No. 16635 ID: 5a2853

If you throw it from a standing position on the ground they will carry it to . . . /me mumbles . . . just a moment while I do some calculation . . . /me mutters . . . Ah, yes, I thought so. To Texas.




Magnetic Particle Inspection Anonymous 18/03/17(Sat)16:37 No. 16634 ID: bf1cc6 [Reply]
16634

File 152130103222.jpg - (117.55KB , 563x422 , Magnetic Testing.jpg )

Anybody on this board done any MPI and has experience with different methods. Im newish and want to learn some new ways that are better suited to my work




Is cold air denser than hot air? Anonymous 18/02/27(Tue)19:46 No. 16630 ID: dfa669 [Reply]
16630

File 151975716827.jpg - (92.68KB , 1024x768 , IMG_0592.jpg )

Plz help


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Anonymous 18/02/28(Wed)01:07 No. 16631 ID: a5c275

Yes. You would have known that by now: hot air balloons rise due to the warm air being less dense. The molecules in warm air spread out, becoming less dense, conversely, cold air molecules remain close, making it dense.

-M


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Anonymous 18/03/02(Fri)04:56 No. 16632 ID: 6914e6

volume = mass / pressure * temperature * constant

If you hold all the variables on the right side but increase the temperature, the volume also increases, and since density = mass / volume, when the volume increases, the density decreases. So an ideal gas under constant pressure becomes less dense as the temperature increases.




Anonymous 17/08/28(Mon)20:04 No. 16539 ID: 269c1e [Reply]
16539

File 150394348278.jpg - (28.69KB , 400x300 , bad-math-fotolia-29084487.jpg )

I'm hoping to return to college and do a second degree in math/a math related subject (ideally Computer Science). Unfortunately, I haven't done math in well over a decade, and when I did math previously it wasn't exactly the highest level math.

Can anyone recommend how I can best learn/re-learn/catch up to college level math and be ready and prepared?


11 posts and 3 images omitted. Click Reply to view.
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Anonymous 18/01/22(Mon)00:19 No. 16617 ID: 7332e9

>>16613
If he’s catching up to college level stuff he has to do highschool math first, best starting with analytic geometry ending somewhere in calculus I or II.
Arithmatic mastery will make the difference between doing well on a timed test, and the discipline from mastering arithmatic when used to master secondary school math concepts will make the difference between getting 80s n 90s vs getting 100s.


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Anonymous 18/01/22(Mon)10:08 No. 16618 ID: 2a858b

>>16617
>the discipline from mastering arithmatic when used to master secondary school math concepts
So please explain how arithmetic helps you solve quadratic equations, or systems of linear equations.
Like, if I need to find the exact roots of f(x) = -sqrt(pi) * x^2 + e*x + 10, how does it help me to know how run a multiplication algorithm by hand?


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Anonymous 18/02/09(Fri)23:58 No. 16622 ID: bee93c

>>16540
which one




start learning about computers Bigattao 16/03/10(Thu)06:19 No. 16297 ID: 00af9a [Reply]
16297

File 14575871945.jpg - (186.25KB , 860x450 , Engenharia_de_Computacao-BLOG-860x450_c.jpg )

Hi sci,
I'm a noob about computers and going to do college of Computer Engineering. I don't know even how to start learning. Can somebody give a tip?


11 posts and 2 images omitted. Click Reply to view.
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Nooby Anon 17/01/07(Sat)07:51 No. 16408 ID: 122f98

Also use Udemy if you have a little bit of money their courses are very informative and useful. Also very good for Python beginner courses.

Good luck bro


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Anonymous 18/02/01(Thu)04:53 No. 16621 ID: fcbe0a

>>16404
how good is cybrary? been told it's a meme and not too good


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Anonymous 18/09/24(Mon)08:25 No. 16696 ID: 3a84e2

>>16621
Cybrary is a big meme

t. edgy hacker

Jokes besides though personally I wouldn't recommend it.
You could look into hacking ctf's tbh anon.
Look into pwnable.kr or pwnable.tw :).
Also search for "ctf" and "liveoverflow", I'm confident you'll learn a lot from him.




Earth Hole Anonymous 17/01/05(Thu)16:26 No. 16406 ID: 4318e8 [Reply]
16406

File 148362999864.jpg - (6.12KB , 300x174 , hjjfokjfklerajogfiaejrgfaer.jpg )

Hello /sci/. If there was a giant hole in the earth leading from one end to the other and- if you jumped in- would you just be pulled to the other side, or just be trapped in the middle by gravity?
>Pic unrelated


4 posts omitted. Click Reply to view.
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Anonymous 17/07/18(Tue)15:21 No. 16528 ID: 9eed6d
16528

File 150038406684.jpg - (583.52KB , 8525x4795 , renakinblue - Copy.jpg )

You would bounce a view times around the center just like in that star wars spoof scene- like a jojo or what that crap is called...


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Anonymous 17/11/10(Fri)21:43 No. 16576 ID: ea535a

you would be trapped like a spring


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Anonymous 18/01/12(Fri)09:30 No. 16612 ID: 42dc73

>people still doesn't know how gravity doesn't work

If there was a hole like that then the planet would just merge back into a ball because o gravity. Let's say it doesn't then it means the whole planet somehow lost a lot of mass which means that the planet is going to fall to you because your gravity pulls it to you.




Difference between instruments playing the same note Anonymous 17/11/30(Thu)16:21 No. 16585 ID: 864454 [Reply]
16585

File 15120552626.jpg - (85.73KB , 1180x613 , rd-2000_hero.jpg )

At the same pitch? I'm trying to create a piece of music from an advert since I cannot seem to pay anyone enough to recreate it as they fear copyright backlash as a piece of production music.

The original track uses several synthetic guitars

https://www.youtube.com/watch?v=_T3skSSt1xU

https://www.youtube.com/watch?v=5mqqj0yfiWM


This is my reasonable attempt :
https://vocaroo.com/i/s1epL4Ex3kBz


I'm an expert at the piano but unfortunately don't really know much about guitars and that's why despite me playing the same notes at the same pitch, it sounds almost entirely different.

Message too long. Click here to view the full text.


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Anonymous 17/11/30(Thu)17:03 No. 16586 ID: f9cb15

It's not possible to explain it in analogy to sine waves, because instruments are not sine wave generators. If instruments were capable of producing perfect sine waves at consistent phases, frequencies, and amplitudes then yes, they would all sound the same.

Comparing an electric guitar to a piano:
1. Plucking a string causes it to vibrate differently vs. striking it. For a given pitch, this generates differently shaped "main waves", which itself gives the sound different harmonics. Compare the sound of a piano to that of a harpsichord. The harpsichord has more harmonics.
2. The guitar doesn't have a resonance chamber, nor do its strings vibrate the air directly. Instead it uses electromagnets to measure the distance of a piece of metal several thousand times per second. Because the strings vibrate perpendicularly to the pickups, this adds a non-linear distortion to the wave, which adds harmonics.
3. Certain maneuvers are possible in a guitar but impossible in a piano. For example, a piano is not capable of doing a proper glissando, because it can only produce notes at discrete ranges. A guitar is also able to do tremolo, which I think it's impossible with a piano.
4. Finally, different mechanisms of producing sound cause the attack, decay, sustain, and release phases to have different lengths, which also affects the "feel" of the sound.


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Anonymous 17/12/01(Fri)09:22 No. 16593 ID: 0c2267

i think some of your later notes are off
also it will sound slightly different if it's in the context of a chord or if there are other parts playing
i think i phrased that wrong
a phrase will sound different in terms of "mood" or "tone" (not tone as in timbre, etc) if it has accompanying notes
i think i phrased that wrong again
whatever
Also yes the timbre of an instrument and the harmonics/partials will effect how it is perceived
but
it probably shouldn't be so different that it sounds so wrong
try a different register, play higher
check your notes again




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