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You can put isotopes in plastic to make self
powered lighting, governments just don't like the idea
of anything nuclear being used.
http://en.wikipedia.org/wiki/Tritium_illumination
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Tim Attwood wrote:
> You can put isotopes in plastic to make self
> powered lighting, governments just don't like the idea
> of anything nuclear being used.
>
> http://en.wikipedia.org/wiki/Tritium_illumination
Interesting. I wonder what the half-life of tritium is? (You realise
that once all of it decays, it stops glowing, right?)
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Invisible <voi### [at] dev null> wrote:
> Tim Attwood wrote:
> > You can put isotopes in plastic to make self
> > powered lighting, governments just don't like the idea
> > of anything nuclear being used.
> >
> > http://en.wikipedia.org/wiki/Tritium_illumination
> Interesting. I wonder what the half-life of tritium is? (You realise
> that once all of it decays, it stops glowing, right?)
Your google-fu fails you, once again.
--
- Warp
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>> Interesting. I wonder what the half-life of tritium is? (You realise
>> that once all of it decays, it stops glowing, right?)
>
> Your google-fu fails you, once again.
Meh. Just over 12 years.
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Warp wrote:
> Your google-fu fails you, once again.
That *is* why it's fu, after all.
I like how you don't even have to hit "I'm feeling lucky" on that one. :-)
--
Darren New, San Diego CA, USA (PST)
Forget "focus follows mouse." When do
I get "focus follows gaze"?
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On 8-2-2010 5:54, Darren New wrote:
> andrel wrote:
>> Actually also that is partly true. If the cell did not maintain an
>> electric field over the membranes (both cell and SR) it would not
>> function.
>
> Yes, but I was under the impression that the depolarization happened
> across the cell membrane, rather than having ions or free electrons
> moving *along* the nerve like a wire.
They don't. Along the length of the axon ion channels are opening
causing ions to flow across the membrane. That in itself will trigger
the opening of channels close by and that will run as a bushfire over
the membrane.
> In other words, unlike a few messages up, it's not "electrical power"
> that's causing muscles to move and such. There's no electricity coming
> into or out of the nerve, but rather a change of potential across the
> membrane.
It is not electrical power, but more electronic signals. More ethernet
than power lines.
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On 8-2-2010 5:54, Darren New wrote:
> andrel wrote:
>> No. It travels within a cell as an electrical signal.
>
> OK. I had thought it was ions moving, rather than free electrons.
>
It is ions. But there are no chemical reactions involved. Just charged
particles that move in space.
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andrel wrote:
> They don't. Along the length of the axon ion channels are opening
> causing ions to flow across the membrane. That in itself will trigger
> the opening of channels close by and that will run as a bushfire over
> the membrane.
Right. We're just arguing over what constitutes "electricity" now. Since it
was originally about supplying power to make illumination, I was assuming
the "electrons flowing thru a conductor" definition.
> It is not electrical power, but more electronic signals. More ethernet
> than power lines.
Sure.
--
Darren New, San Diego CA, USA (PST)
Forget "focus follows mouse." When do
I get "focus follows gaze"?
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andrel wrote:
> It is ions. But there are no chemical reactions involved. Just charged
> particles that move in space.
Interesting. Thank you.
--
Darren New, San Diego CA, USA (PST)
Forget "focus follows mouse." When do
I get "focus follows gaze"?
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On 8-2-2010 20:02, Darren New wrote:
> andrel wrote:
>> They don't. Along the length of the axon ion channels are opening
>> causing ions to flow across the membrane. That in itself will trigger
>> the opening of channels close by and that will run as a bushfire over
>> the membrane.
>
> Right. We're just arguing over what constitutes "electricity" now. Since
> it was originally about supplying power to make illumination, I was
> assuming the "electrons flowing thru a conductor" definition.
For me electricity is a flow of charge. That includes holes in a
semiconductor. It may be that electrons are a required part of some
definition but not in physics or engineering.
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