C
Chiron
Guest
On Thu, 05 Apr 2012 11:50:52 -0700, Ron Hubbard wrote:
transfer of power between the circuit and the coil, it matters. Since it
appears that you don't have such a concern, you probably aren't going to
lose too much. Also, what you're investigating may not follow the math
anyway, if it's some unknown phenomenon.
Of course, if you get some sort of an effect, your results will be less
useful since you won't be able to quantify them. If you're just
experimenting to see whether there's any effect at all, this won't be too
important.
The reason I mentioned TMS was because of the intensity of the fields
used. Your experiments appear to be working with very low-intensity
magnetic fields. The page you cited says 100 nT. TMS uses fields of 1-3
teslas, or 1-10 million times that. The frequencies TMS uses are often
in the kHz range, but they also have tried very low frequencies as well.
There have been some effects, but they were subtle. For example, check
out:
Sallustio, F., S. Di Legge, B. Rizzato, P. Stanzione, and G. Koch.
âChanges in Cerebrovascular Reactivity Following Low-frequency Repetitive
Transcranial Magnetic Stimulation.â Journal of the Neurological Sciences
295, no. 1â2 (2010): 58â61.
Google for more of the same...
So my point was basically that if you don't get major effects at a field
intensity of a tesla or two, the effects you'd get at a millionth of that
intensity would likely be even less noticeable. Or conversely, if there
*were* effects at 100 nT, then you'd expect for these effects to be
severe at a full tesla - which isn't observed.
This comment doesn't *prove* anything, of course. Maybe there is some
sort of effect that doesn't scale along with the stimulus. Still, that is
one of the cardinal signs of "pathological science" as mentioned by
Langmuir, as I pointed out in a separate post.
--
Your mileage may vary.
this case. I think that if you're concerned about the *efficient*Before you invest a whole lot of time and energy into this project, you
might want to do some research into the topic, which is currently under
intense investigation. Â The technique is called "transcranial magnetic
stimulation," or TMS.
I already did the research--
http://www.elfis.net/elfol8/e8elfeeg2.htm
which is why I want an effective coil whose impedance matches the
amplifier though maybe I might just do what th author did and screw the
math...
Ron
I don't think you would have too many problems by ignoring the math in
transfer of power between the circuit and the coil, it matters. Since it
appears that you don't have such a concern, you probably aren't going to
lose too much. Also, what you're investigating may not follow the math
anyway, if it's some unknown phenomenon.
Of course, if you get some sort of an effect, your results will be less
useful since you won't be able to quantify them. If you're just
experimenting to see whether there's any effect at all, this won't be too
important.
The reason I mentioned TMS was because of the intensity of the fields
used. Your experiments appear to be working with very low-intensity
magnetic fields. The page you cited says 100 nT. TMS uses fields of 1-3
teslas, or 1-10 million times that. The frequencies TMS uses are often
in the kHz range, but they also have tried very low frequencies as well.
There have been some effects, but they were subtle. For example, check
out:
Sallustio, F., S. Di Legge, B. Rizzato, P. Stanzione, and G. Koch.
âChanges in Cerebrovascular Reactivity Following Low-frequency Repetitive
Transcranial Magnetic Stimulation.â Journal of the Neurological Sciences
295, no. 1â2 (2010): 58â61.
Google for more of the same...
So my point was basically that if you don't get major effects at a field
intensity of a tesla or two, the effects you'd get at a millionth of that
intensity would likely be even less noticeable. Or conversely, if there
*were* effects at 100 nT, then you'd expect for these effects to be
severe at a full tesla - which isn't observed.
This comment doesn't *prove* anything, of course. Maybe there is some
sort of effect that doesn't scale along with the stimulus. Still, that is
one of the cardinal signs of "pathological science" as mentioned by
Langmuir, as I pointed out in a separate post.
--
Your mileage may vary.