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

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Virtual reality talk Anonymous 15/05/02(Sat)09:04 No. 16093 ID: 4532ed [Reply]

Youtube  Hey /Sci recently I have been thinking significantly about how close we are to making a genuine virtual reality rig/game. With technology like the occlus rift and hi def headphones it should be relatively easy placing someone in a virtual world. The only issue I see at the moment is the actual interaction such as touch and movement. As I see it there is a relatively simple approach which is to model a physical environment to be similar to a virtual environment. I.e track a persons movements within a boundary in a game like virtual tennis there is no tricky terrain or elevation and a user's position is monitored inside the bounds of a physical space the same size. Surely something like this is possible and affordable. Why haven't we seen this yet?.




Something that's been bugging me. Anonymous 14/12/16(Tue)19:41 No. 15999 ID: 465a65 [Reply]
15999

File 14187553071.gif - (1.81MB , 350x331 , strawberries.gif )

If you flip an asymmetrical two-dimensional Flatlander through the third dimension, his right side will become his left side and vice-versa.

Let's say you did something similar to a person, flipping him through a fourth spatial dimension. The problem with this is that the flip isn't just his body parts. The molecules in his body would be flipped too, and many chemicals have asymmetrical molecules which take on different properties when mirrored.

So taking this into consideration, would this flipped person even be able to continue living? Would his death be immediate or more lingering? What effects could we expect to see? Take me down this rabbit hole, /sci/.


6 posts and 1 image omitted. Click Reply to view.
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Anonymous 15/01/30(Fri)23:39 No. 16038 ID: 0c9b56

It's so weird that nobody noticed that this not a new hypothesis.

http://en.wikipedia.org/wiki/Non-orientable_wormhole


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Anonymous 15/03/08(Sun)06:40 No. 16068 ID: 9ecb4f

>>15999
Ignoring the implausibility of 2D life forms and their biochemistry and assuming the survivability of being flipped, by which I also assume you mean he's lifted off his plane into the third dimension and placed back, then he will probably die a lingering death. If any of whatever hypothetical mechanisms permit 2D biosynthesis were to be reversed on even 1 axis it would render him unable to receive nutrition and calories from his former food supply. It would be like human astronauts landing on a planet with a biosphere based on right handed chirality. I believe we're left handed on Earth. They would waste away eating the local foods which, with exception perhaps to some non-chiral oils and amino acids, would provide no nutrition and taste odd if they were not in fact completely poisonous.


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np Madpianist 15/04/29(Wed)18:14 No. 16091 ID: 9fa2a8

Well it would survive, given the fact that an organism in the 2nd dimension also belongs in the third and so on, so a 3D org. also belongs in the 4th with properties that are unknown yet, but all 3D forms, have a determinate form in the 4D, they are not split, all dimensions exist at the same time.




Anonymous 13/11/02(Sat)01:29 No. 15407 ID: 5dd374 [Reply]
15407

File 138335215071.jpg - (11.30KB , 380x380 , human body muscles.jpg )

Why is the human body organized the way it is? Why have decisions so centralized? Do you think there is a model for the system of organization that the body uses, relative to political systems in use in the modern world?


8 posts and 1 image omitted. Click Reply to view.
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Anonymous 13/12/16(Mon)20:05 No. 15487 ID: 1c2d8f

>relative to political systems in use in the modern world

There's the thing, OP. Modern political systems are inefficient. The last thing I'd want is my body to mock modern politics.


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Anonymous 15/03/29(Sun)05:36 No. 16077 ID: ae1ae2

>>15477
wow, look at me go all those years ago
I sound like a children's education programme presenter...


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Anonymous 15/04/16(Thu)11:09 No. 16086 ID: 4182eb

well I could sustain myself by eating money and the souls of children and blacks if my body operated this way.

might be fun




education help Anonymous 15/03/06(Fri)02:12 No. 16065 ID: b80d08 [Reply]
16065

File 142560434327.gif - (1.51MB , 400x223 , idk-what-im-doing.gif )

Hey /sci/ I'm currently looking into an new career choice, I always wanted to do something with math or science, and I'm addicted to computers
My request is if any of you guys are computer engineering or computer engineering tech I would love to get some input on how the career is. For example, if you can be a family man or if you travel too much stuff
like that


2 posts omitted. Click Reply to view.
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Anonymous 15/03/09(Mon)19:23 No. 16072 ID: e3615c

To clarify, are you looking at *computer* engineering, or *software* engineering?

Computer engineers design computer hardware; the occupation is sort of like a specialization of electronics engineering. To my knowledge, they aren't in extremely high demand. Depending on where you live, you might not even be able to find a job.

Software engineers design and build software systems.
Computer science is yet another possibility. Computer scientists often occupy at companies the same positions as software engineers, since the training they receive have a lot of overlap. Computer scientists, unlike software engineers, are also trained to do research, and also spend more time learning about the more theoretical aspects of computer science.


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Anonymous 15/03/29(Sun)07:45 No. 16078 ID: da1583

Best if you have a gf/wife.. it just makes everything make more sense.. also, if you're an adult, that's the normal thing to do


>>
Anonymous 15/04/02(Thu)08:24 No. 16082 ID: 79e9a1

>>16065
You don't want to be a family man. Especially if you have children. Having kids is a terrible financial decision.




need calculations without sci notation _kp_ 14/05/30(Fri)22:51 No. 15694 ID: 105678 [Reply]
15694

File 14014830663.jpg - (100.20KB , 238x579 , rs.jpg )

Hello Gents & Ladies,

I need to calculate x=2^n
where n goes from 0 to 319 in interval of 1.

I tried MATLAB etc but they all start converting the result to exponential form whereas I need the result to be accurate upto unit position.

Can any wise person suggest a way/software to calculate this ( and preferably do it for all values of n so that I don't have to manually calculate for each) ?

Your time & thoughts are much appreciated.


24 posts and 4 images omitted. Click Reply to view.
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Anonymous 15/02/09(Mon)20:07 No. 16051 ID: 58e797

>>16050
You do know using arbitrarily large numbers is pointless, all you're doing is obscuring any point you're trying to make behind incomprehensibly vague values even the most autistic of us would struggle with. Why not chuck in a googolplex or two while you're at it.

Here's a nice article that should help you understand why using real-world values is more useful when trying to make a point:
http://spacecollective.org/TheUndying/5970/Big-numbers-and-the-human-mind


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Anonymous 15/02/09(Mon)20:36 No. 16052 ID: e3615c

>>16051
>You do know using arbitrarily large numbers is pointless
The pointlessness is a property of the operation you'll apply to the value, not of the value itself. For example, 1.067993e+96 and 2^319 are not interchangeable if you're going to use them in cryptographic operations.
In particular, OP originally stated,
>I need the result to be accurate upto unit position

>all you're doing is obscuring any point you're trying to make behind incomprehensibly vague values even the most autistic of us would struggle with.
The numbers are so large because someone settled with a 1e-13% error in a 96-digit value. The error is an 81-digit value.


>>
Anonymous 15/03/31(Tue)05:52 No. 16080 ID: da1583

was going to reply to the content of the message but the picture was too distracting, sry




Anonymous 15/01/17(Sat)18:16 No. 16028 ID: 36bbdb [Reply]
16028

File 142151497518.jpg - (44.80KB , 600x600 , LOOMINATI.jpg )

Kay guys. Not sure if I should post this here or in Tech Support but I need some basic tech assistance, nothing is borked. I bought a Windows phone and I'm disgusted with its obsession on finding my location and harvesting my data, often without my permission. When I tell apps and programs they can't use GPS to stalk me or gather my data, they refuse to work--even though the functions they perform are not reliant on positioning.

What can I use to keep the phone from being a little Big Brother all the time? I'm not worried about the gubbermint, they are welcome to my porn and terrifying Internet history. I just hate being advertised to and watched by corporations everywhere I go. Are there any add-ons I can use to make the phone more secure/more resilient to casual data trawling?

I'll take this to tech-help if I have to, but I wanted to ask you chaps first. Thanks in advance.


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Anonymous 15/01/17(Sat)18:17 No. 16029 ID: ab9f96

I have a windows phone and it rarely does this. Mostly because I don't have any apps.

solution? Use phone for text/calls only and turn off data. gj




A nice initiative Anonymous 15/01/09(Fri)20:44 No. 16024 ID: c7d0c5 [Reply]
16024

File 142083267722.jpg - (8.75KB , 100x100 , 7moon.jpg )

It's nice that this emerging site tries to introduce progressively the mathematics and the science at the people.
http://www.magikbit.com/english/mathematics/mathematics.php
we hope that they follow other chapters, as they promise on their home page.




how to make airplane Anonymous 15/01/04(Sun)17:37 No. 16019 ID: 61d208 [Reply]
16019

File 142038945866.jpg - (548.56KB , 1280x720 , F24F35.jpg )

http://youtu.be/XjEO8NqgAKk




Cryptoforums.net Technology Forum Cryptoforums.net Technology Forum 14/05/13(Tue)10:25 No. 15656 ID: 288b60 [Reply]
15656

File 139996955137.png - (8.43KB , 82x77 , CF-logo.png )

Hello chans of the internet. We at https://cryptoforums.net have created a MyBB forum dedicated to the discussion of things like Bitcoin, Privacy, Security, Cryptography, GNU/Linux, Philosophy, Politics, Freedom, Cryptocurrency, Hacking and many other general subjects. We are currently in our early stages and we want to invite more members. If you like any of those subjects you should come check us out! We also respect anyone's opinion even if negative so give us all your positive/negative support/criticism!


7 posts omitted. Click Reply to view.
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Anonymous 14/08/11(Mon)18:38 No. 15815 ID: d9f5aa

>>199869
the joke's getting old, shillfag.

OP your forum would be a lot more appealing if it didn't require an email.
trashmail makes it easy but waiting for the email to arrive is a fucking dealbraker.
I'd probably rather enter a fucking google recaptcha and have my everchanging dynamic IP logged by some useless waste-of-money agency than wait for a shitty activation mail (and possibly still get logged if my ISP or trashmail provider is sharing data as much as google does).


>>
Anonymous 14/08/11(Mon)18:39 No. 15816 ID: d9f5aa

>>15662, not 199869 obv.


>>
Registration requires captcha, but none displayed for me Anonymous 15/01/02(Fri)05:55 No. 16015 ID: 226b1d

I've tried to register on cryptoforums three times tonight, using Opera, FireFox, and IE. In all three browsers, I agree to the terms, populate the fields, and submit the form, to be greeted with:


Please correct the following errors before continuing:
•The image verification code that you entered was incorrect. Please enter the code exactly how it appears in the image.

There is no captcha image to enter. There's a question to answer, which I answered correctly each time.

Is the new user registration broken, or am I the only one having this issue?

Also, your Contact Us mailto link is broken. It contains no email address. Ergo, I could find no way to reach a site administrator, hence the post here.

Thanks.




Anonymous 13/07/18(Thu)15:31 No. 15206 ID: 9083c1 [Reply]
15206

File 137415428455.jpg - (94.22KB , 640x569 , turkey_roast.jpg )

I might sound like an idiot for asking this, but can somebody explain the science behind the following:

When you're grilling two steaks over a flame, it takes the same amount of time, whether it's just one or two steaks.

When you're roasting two turkeys inside an oven, it usually takes 1.5 to 1.8 times longer than when there's just one turkey inside.

Why doesn't it take the same amount of time as it does when grilling two steaks over a flame?

Why am I an idiot for not understanding this?


2 posts omitted. Click Reply to view.
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CandleJack 13/07/23(Tue)22:45 No. 15220 ID: 2f260d

>>15219

Ovens are not perfectly efficient. With the one turkey, say 50% of the energy goes toward heating it, while the remainder heats the air or escapes outside. With two turkeys, 75% of the heat goes to them, while the rest heats the air (which there is less of because the oven is more full) or escapes.


Have you heard how a full refrigerator is more efficient than an empty one? That's because it takes more energy to heat or cool air (and maintain it) than it does to heat or cool an object. It's just like that, but in reverse. Because there is less air in the oven, it doesn't waste energy heating that air; the conserved energy goes into heating the other turkey.


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Anonymous 13/07/24(Wed)01:59 No. 15221 ID: 9083c1

>>15220
Now I get it, thanks a lot!


>>
Anonymous 14/12/30(Tue)20:13 No. 16012 ID: a607c9

>>15220

Thats incorrect. It is a common misunderstanding that air needs more energy to cool down in a fridge than solid or liquid mass(like bottles full of water) does.
While it is true that a full fridge uses less energy than a empty one, that is only the case if you leave the solid mass inside. Air has a thermal capacity of roughly 1 J/gK (Joule per gram and Kelvin ). The thermal capacity of Water is very roughly 4 times higher. This means you would need 4 times the energy to cool down (or heat up) 1 kg of Water than 1 kg of air. A fridge is typically less than 200 liters big inside, which is 0,25 Kg of air. If you put something in your fridge which is at least 0,065 kg (or 65 g) heavy and mostly made of water, it will take more energy to cool down than if all the air inside the fridge would have changed.

So why is it still more efficient to have a full fridge than an empty one?
When you open the fridge there is normally no liquid or solid mass leaking. However the cold air is escaping even if you don't want cold air in your kitchen. Thus the air loss is energy loss. If you have a full fridge there is less air in it and therefore less air can escape.
Top-opening-freezers are more efficient because of that. Cold air is more dense (heavier) than warm air. The cold air stays in the top-opening-freezer while it floats out of a front-opening-freezer.




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