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http://web.mit.edu/newsoffice/2007/wireless-0607.html
Sounds wonderful, but...
I'm not sure if speakers or any magnetic device would work in such a strong
magnetic field.
-Nekar
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Nekar <nek### [at] gmail com> wrote:
> http://web.mit.edu/newsoffice/2007/wireless-0607.html
> Sounds wonderful, but...
> I'm not sure if speakers or any magnetic device would work in such a strong
> magnetic field.
Not to talk about pacemakers or the unknown long-term effects that can
have on human health.
--
- Warp
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"Nekar" <nek### [at] gmailcom> wrote in message
news:4789a70b@news.povray.org...
> http://web.mit.edu/newsoffice/2007/wireless-0607.html
>
> Sounds wonderful, but...
> I'm not sure if speakers or any magnetic device would work in such a
strong
> magnetic field.
>
Didn't Tesla claim to have discovered something like this?
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>> Sounds wonderful, but...
>> I'm not sure if speakers or any magnetic device would work in such a strong
>> magnetic field.
Well, it's not a stationary field, and it's well outside the audio
frequency range. And, indeed, if these dudes have out their science
right, the field is virtually invisible to anything that doesn't
resonate at just the right frequency.
[Hmm, I wonder what happens when several homes have these, and their
frequencies clash?]
> Not to talk about pacemakers or the unknown long-term effects that can
> have on human health.
1. You're standing in a 40 microtesla magnetic field right now.
2. You're surrounded by devices that produce far stronger magnetic fields.
3. Medical imaging scanners often generate fields of up to 3 T, yet show
no known negative effects on human health.
4. According to known physics, most physical materials are very weakly
affected my magnets.
If you want to worry about something, worry about all those migrating
animals which reputedly use the Earth's magnetic field to navigate with...
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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Gail Shaw wrote:
> Didn't Tesla claim to have discovered something like this?
Telsa claimed to have come up with several such schemes, IIRC. (Of
varying degrees of practicallity or otherwise.)
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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Orchid XP v7 <voi### [at] devnull> wrote:
> > Not to talk about pacemakers or the unknown long-term effects that can
> > have on human health.
> 1. You're standing in a 40 microtesla magnetic field right now.
Can you charge a laptop with a 40 mecrotesla magnetic field?
> 2. You're surrounded by devices that produce far stronger magnetic fields.
But far stronger than the suggested form of wireless energy transmission?
> 3. Medical imaging scanners often generate fields of up to 3 T, yet show
> no known negative effects on human health.
They do so for relatively short periods of time, and humans are exposed
to them once of twice. They are not generated for hours every single day
with the same person present at all times.
> 4. According to known physics, most physical materials are very weakly
> affected my magnets.
Yet a strong enough magnetic field can kill a human. (Sure, it has to
be staggeringly strong, but it's possible.)
--
- Warp
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"Orchid XP v7" <voi### [at] devnull> wrote in message
news:4789e75f$1@news.povray.org...
> If you want to worry about something, worry about all those migrating
> animals which reputedly use the Earth's magnetic field to navigate with...
>
Ooh... are migrating birds dangerous to my health? =^S
;o)
-Nekar
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"Gail Shaw" <initialsurname@sentech sa dot com> wrote in message
news:4789e57e@news.povray.org...
>
> "Nekar" <nek### [at] gmailcom> wrote in message
> news:4789a70b@news.povray.org...
> > http://web.mit.edu/newsoffice/2007/wireless-0607.html
> >
> > Sounds wonderful, but...
> > I'm not sure if speakers or any magnetic device would work in such a
> strong
> > magnetic field.
> >
>
> Didn't Tesla claim to have discovered something like this?
>
I remember something like that.
Interesting how wi-tricity, plasma rockets and the travelling to Mars in 3
hours all use magnetic fields.
What next?
...The Philedelphia Experiment comes to mind... (the myth/story/whatever -
claims resonating magnetic fields were used to transport the ship large
distances instantly) =oP
This is all sounds very crazy to me. But then again when electricity was
introduced at the beginning of the modern era it must have looked like magic
to everyone.
-Nekar
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>> 1. You're standing in a 40 microtesla magnetic field right now.
>
> Can you charge a laptop with a 40 mecrotesla magnetic field?
Unlikely.
>> 2. You're surrounded by devices that produce far stronger magnetic fields.
>
> But far stronger than the suggested form of wireless energy transmission?
The document referenced (and similar reports I've seen) don't actually
go into just "how strong" this field actually is. Presumably it's quite
a bit more than 40 microtesla, but that's all I could tell you.
>> 3. Medical imaging scanners often generate fields of up to 3 T, yet show
>> no known negative effects on human health.
>
> They do so for relatively short periods of time, and humans are exposed
> to them once of twice. They are not generated for hours every single day
> with the same person present at all times.
How about the machine operator?
The magnet in an NMR machine is essentially a permanent magnet - you
don't "turn it on" just to do the scan, and then turn it off again. It
takes several days to charge up, and a similar time to shut it down
properly.
[You can actually buy 3 T magnets that fit in your pocket. The challenge
for an NMR machine is to make a field that's 3 T *all over*, or at least
in a space big enough to fit a person inside...]
>> 4. According to known physics, most physical materials are very weakly
>> affected my magnets.
>
> Yet a strong enough magnetic field can kill a human. (Sure, it has to
> be staggeringly strong, but it's possible.)
Really? That's news...
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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Orchid XP v7 <voi### [at] devnull> wrote:
> >> 3. Medical imaging scanners often generate fields of up to 3 T, yet show
> >> no known negative effects on human health.
> >
> > They do so for relatively short periods of time, and humans are exposed
> > to them once of twice. They are not generated for hours every single day
> > with the same person present at all times.
>
> How about the machine operator?
Does the machine operator really stay in the same room as the NMR machine?
He has to use some buttoms? They separate the computers from the magnetic field,
don't they?
> The magnet in an NMR machine is essentially a permanent magnet - you
> don't "turn it on" just to do the scan, and then turn it off again. It
> takes several days to charge up, and a similar time to shut it down
> properly.
That's right, but people usually don't stay all day and night in NMR machines.
Nobody tried, nobody says it's dangerous. Perhaps it isn't, but might be pretty
boring. Boring enough to get hurt? :-)
No, I'm not talking about those things, some people do, when doing medications
with small magnetic fields ("as your blood contains iron and as everybody
knows, it has magnetic attribute" :-) ), but there aren't safety guides for the
use of NMR machines without reasons.
> >> 4. According to known physics, most physical materials are very weakly
> >> affected my magnets.
> >
> > Yet a strong enough magnetic field can kill a human. (Sure, it has to
> > be staggeringly strong, but it's possible.)
>
> Really? That's news...
We are not sure, if it really kills humans, as we never tried it. (I hope so)
But it has effects and a magnetic field strong enough is able to kill germs, as
a US patent proves.
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2Fsearch-bool.html&r=31&f=G&l=50&co
1=AND&d=ptxt&s1=4524079&OS=4524079&RS=4524079
But I don't conclude those magical magnetic fields are bad. :-)
bluetree
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