File: 4a8259427562956.jpg (102KB, 778x960px) Image search:
[Google]
102KB, 778x960px
The representation of lasers in popular culture, and especially in science fiction and action films, is very often misleading, if not downright wrong. Some examples?
Unlike in air, a laser beam would not be visible to the naked eye in the near-vacuum of space, because there is not sufficient matter in space to produce the light scattering needed to actually see the beam. Blaster strikes from the Tie Fighters in Star Wars? They'd be invisible.
Science fiction films also often depict lasers moving at only a few metres/second, in a manner reminiscent of conventional tracer ammunition. But a laser is electromagnetic radiation - it travels at the speed of light.
Action movies e.g. Mission Impossible, often depict laser-based security systems whose beams can be illuminated with dust or powder and cleverly defeated with a combination of mirrors. Such security systems almost never use visible lasers, and putting enough dust in the air to make the beam visible would probably trigger the alarm anyway.
In the 1964 film Goldfinger, Bond faces a hot laser beam approaching his groin, inch-by-inch melting the solid gold table to which he is strapped. Goldfinger's director, Guy Hamilton, found that a real laser beam would not show up on camera, so it was inserted after filming as an optical effect. The table was also precut and then coated with gold paint, and the faux-laser melting effect was achieved by a man sitting below the table armed with an oxyacetylene torch.
2 Posts / 1 Images
View this topic
>>
>>7780893
We know, it is called science FICTION for a reason. /thread
If you are not in the top 50 you can't even claim to achieve something in life.
6 Posts / 1 Images
View this topic
>>
>>7780793
>takes university rankings seriously
That's evidence that you'll never achieve something in life.
>>
>>7780796
this desu.
>None of the reviewed criteria for international ranking seems to have very good construct validity for both educational and research excellence, and most don't have very good construct validity even for just one of these two aspects of excellence. Measurement error for many items is also considerable or is not possible to determine due to lack of publication of the relevant data and methodology details. The concordance between the 2006 rankings by Shanghai and Times is modest at best, with only 133 universities shared in their top 200 lists. The examination of the existing international ranking systems suggests that generic challenges include adjustment for institutional size, definition of institutions, implications of average measurements of excellence versus measurements of extremes, adjustments for scientific field, time frame of measurement and allocation of credit for excellence.
(source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2174504/)
>>
>>7780793
>takes rankings seriously
>thinks he's going to make it
Bruh, I got something to tell you...
File: images (31).jpg (23KB, 592x248px) Image search:
[Google]
23KB, 592x248px
So scientists have now confirmed finding gravitational waves that bend space and time, thereby proving the last of Einsteins theories right. In addition to finding a protein which could be responsible for unicellular organisms evolving to become multicellular.
Best Science Week ever?
3 Posts / 1 Images
View this topic
>>
>>7780592
trollscience.com/2016/01/gravitation-waves-found-100%-for-sure
>>
>>7780555
>thereby proving the last of Einsteins theories right.
desu the indirect measurement from 2004 was proof enough for me.
File: 1427908659046.jpg (377KB, 1280x853px) Image search:
[Google]
377KB, 1280x853px
How the fuck do I learn to discipline myself?
I have these:
>Pomodoro Technique every single day (no zero days)
>Wake up every day at 8 AM no matter what (hard asf tbqh)
>SMART tasks (google it. may sound like bullshit at first but makes a lot of sense in practice)
>Start doing the least pleasurable task first. This is combined with pomodoro to increase my discipline. I hate working on my dissertation, but I woke up at 8 AM and did 5 pomodoros on it.
What else is there? I probably need to address eating habits/diet at some point cause I eat like shit. For physical exercise I skateboard. I've done 6 months of gym, but no thanks.
So how do you self-discipline like a fucking monk?
And yes this is /sci/ because I'm looking for methods actually tested scientifically, not bullshit "10 ways to suck dick" from shitty websites, and besides, a lot of us are students here and self-discipline is one of the most important ingredients to do real progress in our fields
49 Posts / 4 Images
View this topic
>>
>>7780509
You just fucking do it. Every passing moment you're getting closer to lying 6 feet under, so hurry the fuck up and do it.
>>
>anyone here
>doing real progress in their fields
heheheheheheheheheheheh
>>
Meditate on the fact that you will be dead soon.
You think you have time. You dont.
Either get it done or do something else because one day your last breath will escape you and the blackness will come in from the sides
Conremplate it and you wont have to worry about motivation
File: bølgefysik.png (2KB, 304x101px) Image search:
[Google]
2KB, 304x101px
Hey guys
i'm gonna make a school project with wave physics, but i need a social problem, do some of you guys know one?
9 Posts / 1 Images
View this topic
>>
>>7780508
Isn't posting homework-esque requests against protocol?
>>
>>7780522
it is not the report i need just a problem
>>
>>7780522
Shut up stupid tripfag.
Anonymous
Help needed. Heat resistant, non heat transferring, electrical conductive material. 2016-01-13 10:05:24 Post No.7780410
[Report] Image search: [Google]
Help needed. Heat resistant, non heat transferring, electrical conductive material. 2016-01-13 10:05:24 Post No.7780410
[Report] Image search: [Google]
Help needed. Heat resistant, non heat transferring, electrical conductive material.
Anonymous
2016-01-13 10:05:24
Post No. 7780410
[Report]
[View this topic]
Hello /sci
We are looking for a material that meets the following three conditions:
It should be able to withstand a fire (temperatures of maximum 1200 degrees celsius (2192 F) in our conditions)
It should be able to act as an antenna (electrically conductive)
It should not be heat transferring (to prevent it from grilling the electronic component that it is attached to.
So short story long, we want to make a component that is able to transfer some data, while inside a burning building. So we seem to have solved the problem of cooling and protecting the other electronic components with some heavy isolation, but we fear that an antenna made of kobber or steel will be too much of a heat bridge. Furthermore, it is not possible to have the antenna inside the heat shield, as that will weaken the signal too much. So we hope that you guys in here can help us find a material that does just what we want.
Feel free to ask if my gibberish english is not clear enough :)
Thanks everyone in advance!
9 Posts / 1 Images
View this topic
>>
bump for interest
>>
>>7780410
I doubt you can find such material.
Have you considered a combination of materials?
I'm sure you could find a combination of all three required properties.
>>
>>7780410
Tungsten?
But why don't you get an long list of metals and alloys along with their heat and electrical conductivities ? Then you can select the best one for your use case.
Is NASA going to die? Judging by the looks of many potential politicians, funding is either gonna be dimunutive or non-existent. Only hope is that Trump wins.
4 Posts / 1 Images
View this topic
>>
Bernie doesn't care about NASA and will probably funnel all that money to somewhere else. Carson doesn't even believe in evolution so he might just dismiss most scientific instutituons.
Trump will make NASA great again.
>>
>>7780355
>bernie doesn't care about nasa
>refering to an out-of-context choice he made in his 20s
>thinking the government will ever start funding nasa again unless it has profit or some sort of arms race motive
>>
>>7780368
How would you like to have cheap orbital vehicles that could send bombs down to decimate the enemy? No one has any cheap way to counter them
File: Arend_Heyting_(1967).jpg (12KB, 220x293px) Image search:
[Google]
12KB, 220x293px
Do you like constructive mathematics?
8 Posts / 2 Images
View this topic
>>
>>7780286
very much.
I reject non-constructive mathematics, which basically says *take my word for it*
>>
Well it's an interesting idea. Besides, I'm sure anyone who does math is more satisfied with an "effective" proof than a reductio ad absurdum.
Then again, I would not reject non constructive math. It does not bother me that much, the constructive proofs are like a bonus.
>>
>>7780358
and then banach tarski happens
File: Keynes.jpg (83KB, 860x549px) Image search:
[Google]
83KB, 860x549px
I want to study economics. How should I get started? What are the best places to learn? Do you have an economics degree and what do you do now?
32 Posts / 6 Images
View this topic
>>
Where do you live/ want to study?
How to get started? I guess there is a lot of online learning resources... a basic macro and micro course would be a good start. Ensure you have a sufficient background in math and statistics is desirable.
Currently, graduating undergrad and looking to go into masters.
>>
>>
File: bad_economics.gif (11KB, 485x478px) Image search:
[Google]
11KB, 485x478px
>>7780282
Understand the economics is very depressing. It really is a "dismal science". You learn how massive collective stupidity can be, in a manner that effectively destroys your hope for humanity.
So I ask why do you want to study this?
note: I hold a secondary Bachelors of Since in Economics.
I'm new to /sci/ so sorry if this is a shit question.
I study philosophy and psychology in uni and am primarily interested in questions pertaining to "the unconscious" or unconscious processes. Philosophers and psychoanalysts definitely seem to be interested in explaining what the unconscious "is" and giving a topographical account of the mind as such, but I don't always get that same impression in my more neuroscience based classes. My questions are basically: in what ways do cognitive scientists and neuroscientsists try to explain unconsciousness? Are they also interested in giving a topographical account of the mind? What type of work is being done in these fields to explore unconsciousness?
9 Posts / 4 Images
View this topic
>>
Here is an interesting experiment you can do.
Pick up two objects simultaneously.
Tell yourself which object is heavier.
You'll notice that your evaluation was nearly instant, and also had nothing to do with your conscious mind. It's as if your conscious mind ordered some unconscious part of the brain to do this judgement, and then relay back the answer so that linguistically you can acknowledge the result.
>>
File: yfwgodexists.gif (2MB, 235x240px) Image search:
[Google]
2MB, 235x240px
>>7780229
>>
>>7780219
Ask for a refund of your tuition fees.
Alright so I'm starting my physical science 101 course this semester with its lab, but I'm also taking some other serious courses that I may need to focus more on. I'm not expecting to get by without studying or anything, but could someone maybe give me a heads up on what I'm getting into. Will it be that difficult?
2 Posts / 1 Images
View this topic
>>
>>7780175
>what I'm getting into
you could just look at the syllabus
Anonymous
Probably commonly asked 2016-01-13 05:33:40 Post No.7780135
[Report] Image search: [Google]
Probably commonly asked 2016-01-13 05:33:40 Post No.7780135
[Report] Image search: [Google]
File: 1444833592860.gif (545KB, 320x796px) Image search:
[Google]
545KB, 320x796px
Under a hypothetical voice, what exactly IS at the end of the universe? Could we just be a peice of matter amidst of white noise? Or the thought of a god?
4 Posts / 1 Images
View this topic
>>
Probably commonly answered: No one knows
>>
>>7780145
Guess then
>>
I think it can either be a closed or open system. Closed = the end is the beginning, open = there's nothing but empty space that extends indefinitely
File: th (24)_kindlephoto-88726358.jpg (9KB, 480x480px) Image search:
[Google]
9KB, 480x480px
I shoulder this shotgun and shoot a deer with a slug. Strangely, the stock tapers to a point that's roughly 12 gauge.
The slug tears through the deers central cavity destroying the heart, lungs, and bones around it.. killing it quickly.
My shoulder doesn't even get bruised.
Fuck you, Newton. And fuck your laws.
9 Posts / 1 Images
View this topic
>>
The entire gun's mass has to be accelerated by the recoil, and since it is much larger than the bullet, it is accordingly accelerated much less.
That being said, I think it probably would bruise you. I've known people to get bruises from firing guns with entirely unmodified stocks, especially guns and relatively powerful cartridge configurations
>>
I'm pretty sure you're supposed to attach an actual stock to that pointy part.
>>
>>7780026
OP here I'll admit shooting that thing would SUCK.
But if it was shouldered on the most fleshy area, it would not bruise. Unless you're prone to bruising.
It would still hurt.
File: motherfucking titanium png.png (1MB, 1508x2449px)
1MB, 1508x2449px
Motherfucking Substances Thread
Anonymous
2016-01-13 03:41:12
Post No. 7779973
[Report]
[View this topic]
Fresh hand-made OC
9 Posts / 3 Images
View this topic
>>
>>7779973
Bretty gud, OP.
>>
>>7779973
Saving, good shit
>>
>shit never brokes
File: transcash.png (200KB, 768x768px) Image search:
[Google]
200KB, 768x768px
Any male nurses or male nurse students? I'm choosing nursing for the money. I do have compassion for others, but I don't know if i'll like being a nurse. I will like a median salary of 63k. I will like being done with school after an 18 month program. I will like tuition reimbursement to get my bachelors.
My end goal is not to do nursing all my life. My goal is to make and save as much as possible and get back into business. I am an entrepreneur at heart, but the realist in me says I wont be able to secure a business loan unless i'm making good money already.
3 Posts / 2 Images
View this topic
>>
I hear its hard as fuck to get in because med students use the faculty of nursing to take their science courses. It's a high paying job and hell you will meet a lot more bitches than the engineers.
>>
File: 1450024935645.jpg (186KB, 1050x1080px) Image search:
[Google]
186KB, 1050x1080px
>>7779969
>choosing nurse for money
>not choosing nurse for unlimited supply of liberated female med students