/diy/ - Do It Yourself

>>681463
any material can absorb multiple photons. it just get extremely unlikely. you need a high intinsity laser to even get a measurement with high grade equipment, and thats only 2 photons absorbed at the same time. It get highly unlikely the more photons . Now since the op can only deal with IR. you would have to absorb maybe 3-5 photons at once to get to the visible band.

>>681446
No. In order to get the Phosphorescence effect you need to have the electron in a high excited state (about the same excitation energy as visible light). Normally objects absorb light and emit it back out very fast. But for some materials there is a state below the excited state and above the ground state that can have a long lifetime. This means it takes longer to emit the light. In order to get to this state between the excited and ground the electron has to lose energy (small amount of heat).

So you can't get a Phosphorescence effect from low temperature heat for 2 reasons i can think of:
1. the amount of heat required would melt or breakdown the material (temp of the sun).
2. the light radiation of low heat is less than visible light and therefore can't fall back down to the ground state by releasing a photon of visible light energy.

basically your input is too low of energy to get a output of visible energy

If someone knew of such a thing it would probably be top secret IR cameras for the military.

>>664416
what camera do you have?

here is the general trend of a typical camera sensor Quantum efficiency

Try to get just random lenses (even flat peices of glass) around the house or whatever and try to see if you can focus an image behind it. try far and close up.

>>659742
i think thats that sharp needle stuff. humans can touch it and not get stabbed by the tiny tiny needles but when an insect touches it they get completly fucked like they are in a pool full of knifes. i dont remember what its called.

cool shit try that op.

>>658902
also today while measuring i just found an amazing property of a certain organic solar cell that will be a major game changer. I just need to get with my team and write the damn paper.

other one was too blurry

cool little guy

measureing

hope its not that blurry

>>650304
Archived
http://4archive.org/diy/thread/650304

>>650304
HAHAHAHAHAHAHAHAHAHAHAHHAHHAHA OH SHIT this had me tearing up from how hard i'm laughing. I'm surprised there isn't marks on the floor from the knuckle dragger that made this. Someone archive this please

>>648401
Make a lightbulb vape dude. The only pipe i can think of is an apple pipe

>>643532
sorry horrible video didn't describe anything
https://www.youtube.com/watch?v=DtQ746MPrNs

>>642850
how old is it?

could be the timing, spark plugs, air filter, alot of things man.

>>640651
they do use nuke reactors for power and use xenon for fuel. I would use nuke for both. They use xenon because its nonreactive not because its heavy. you use the same amount of energy pushing a xenon particle 17m/s vs an alpha particle 100m/s.

>>640645
same princple

captcha: restricted ionolice

>>639310
that's silly bro.
i've been workin with Carbon nano tubes for a while now and can tell you the only thing hold it back is how hard it is to mass produce. i think the only thing the CNTs should be used for is for strength. You can shield it with insulators/ceramics.

IF anything the counter wieght on the space elevator should be collecting solar ionized particles and become electrically CHARGED and then insulated from the ground but climber should be able to fell the field on the CNTs and then climb up like your hair to a balloon.

>>639288
Ion propulsion isn't purely electric

you need a fuel source of ions. Right now its radioactive materials (alpha particles and beta particles).

you create a small nuclear reactor that generates electricity and alpha particles or beta particles.The reactor creates a static electric field were one particle is accelerated oppositely from the spaceships direction and gives the momentum to the spaceship. This is exactly what happens when you sit on a rolly chair and throw a heavy ball in one direction and you roll the other way. Very simple concept and very slow acceleration.

You will always need a fuel source of ions though. It will NEVER be purely electric. You always need to push something away from the spacecraft.

However if you find someway to bend the spacetime infront and behind the spaceshitp... then you don't need fuel and you have the noble prize for the year 2200 cus that shit isn't gonna happen anytime soon.

>>631190
4. you could also stack a shit load of magnets along the middle wire to enhance the magnetic field. that should do a lot better than just 2 on top and bottom. just make sure insulate them from the middle wire.

as long as the magnetic field lines are vertical (perpendicular to the the water flow) you should be good.

>>630786
>http://www.physicscentral.com/experiment/physicsathome/electricwhirlpool.cfm
you are correct

>>630793
this guy is wrong

follow the picture described in the link but remove the battery and use the whirlpool to spin the water.

The problems that will arise:
1. If the whirlpool makes a cavity in the middle your wire won't be able to make contact with the water in the middle.
2. you need a second wire or conductive surface on the edge of the whirlpool in order of it to work (hell try making the whole container metal.
3. you have to make sure you don't create a electrolytic cell with the voltage and electrodes and salt used.
4. your magnetic field has to be strong enough to get the same effect on top so i'd recommend just put 2 magnets on top and bottom so their fields complement each others.


you will have a potential at both electrodes.

>>627030
>low current

I think you mean low voltage. The only thing that will determine the current for these is if it is charging dust or particulates with free electrons. If it isnt chargeing particulates then it basically a big capacitor and caps dont have current unless it charging. If the voltage is near high enough to spark and break down then you are making ozone. If the 2 metal screens are flat ( basically a parallal plate capacitor) then it gonna need some high voltage to charge it. Less than or around 10kV per cm of seperation is my rule or else you start breaking down high humidit. It would spark but it will sizzle. It will spark at the edges because the E field is strongezt there.

>>625652
this was the scattered laser light from the smoke at zero voltage.

don't have a pic at max voltage

>>624842
i used a series of copper wire meshes alternating high voltages. The distance between each mesh and the voltage difference gives the electric field. You want it to be somewhere less than the ionization of oxygen or nitrogen. I'd say getting the high voltage DC is the hardest.

pic related. if you set it up right you could have a lot of flow. i think there are better models than mine. I used mine for a physics project to get measurements easily. I was getting really high efficiency too. about 70-90% under heavy load of burning incense sticks.