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Re: The Cell Phone Thread
Posted: Mon Nov 04, 2013 6:46 am
by fhunter
foxytaur (imported) wrote: Sun Nov 03, 2013 10:15 pm
Moi, go get the nexus 5. It's the hip thing to do. Tinfoil hats are not cool.
I drools over that phone.
NB: I agree with A1, phones are like modern swiss army pocket knives.
Smartphones stopped draining battery in less than two days?
PS. Nexus 5 is not a phone, it's a shovel. With phone functions.
Re: The Cell Phone Thread
Posted: Thu Nov 07, 2013 7:38 pm
by george2u2 (imported)
I've had a Nokia windows phone and I'm curently using a 4Glte Android I haven't had one that would go 24 hours on a charge for years, of course I have been known to use 29gb a month.
Re: The Cell Phone Thread
Posted: Sun Nov 17, 2013 3:55 am
by transward (imported)
fhunter wrote: Fri Nov 01, 2013 3:12 pm
Power from any source (radioactive, light, sound, etc) is proportional to reverse of squared distance. (1/r²).
).
A minor point. If my memory serves me, that is referring to a point source of radiation. On power lines where there is a line source of radiation the power is proportional to the inverse of the distance (1/r) rather than the inverse of the squared distance. At least until the distance from the power line is great in relation to the length of the line.
Transward
Re: The Cell Phone Thread
Posted: Sun Nov 17, 2013 1:38 pm
by fhunter
transward (imported) wrote: Sun Nov 17, 2013 3:55 am
A minor point. If my memory serves me, that is referring to a point source of radiation. On power lines where there is a line source of radiation the power is proportional to the inverse of the distance (1/r) rather than the inverse of the squared distance. At least until the distance from the power line is great in relation to the length of the line.
Transward
Yes, that is for the point source.
I've done a bit of calculation,
basically said, that a line source is a collection of point sources. Then, by the principle of superposition, I summed all fields of those points:
for one point: p/(r²+x²), where x is a distance from the point, p is source intensity, and r is radius.
Then I integrated this by x from -∞ to ∞, to calculate sum of field strengths for infinitely long wire. Ok, I cheated and used maxima, a symbolic mathematics software, and got:
πp/r
So, yes, you remember right.
Re: The Cell Phone Thread
Posted: Sun Nov 17, 2013 5:54 pm
by transward (imported)
fhunter wrote: Sun Nov 17, 2013 1:38 pm
Yes, that is for the point source.
I've done a bit of calculation,
basically said, that a line source is a collection of point sources. Then, by the principle of superposition, I summed all fields of those points:
for one point: p/(r²+x²), where x is a distance from the point, p is source intensity, and r is radius.
Then I integrated this by x from -∞ to ∞, to calculate sum of field strengths for infinitely long wire. Ok, I cheated and used maxima, a symbolic mathematics software, and got:
πp/r
So, yes, you remember right.
And, moving on to the next dimension, radiation from an infinite plane would be constant regardless of distance, which might be important for implementing Tesla's dreams of wireless transmission of power.
Transward
Re: The Cell Phone Thread
Posted: Mon Nov 18, 2013 1:20 pm
by fhunter
transward (imported) wrote: Sun Nov 17, 2013 5:54 pm
And, moving on to the next dimension, radiation from an infinite plane would be constant regardless of distance, which might be important for implementing Tesla's dreams of wireless transmission of power.
Transward
If one can create infinite plane, I somehow think that wireless power would not be that important.