Subject: (Curry) (Cvijovic) mobile phones / power (fwd)
Date: Thu, 19 Nov 1998 191348 -0600 (CST)
From: "Roy L. Beavers" <rbeavers@llion.org>
To: emfguru <rbeavers@llion.org>
--------------------------------------------------
---------- Forwarded message ----------
Date: Thu, 19 Nov 1998 15:10:17 -0700
From: "Bill P. Curry"
To: "Roy L. Beavers"
Subject: Re: (Cvijovic) mobile phones / power (fwd)
Roy and Drasko,
The experiments that I have seen reported which showed sensitivity to the AC
magnetic field and not the AC electric field were carefully devised to reveal
any electric field sensitivity which might be there and showed none. Some
experiments showed sensitivity to both fields, but most were more sensitive to
the magnetic component. Remember that an electromagnetic wave has both
components with the associated vectors at right angles to each other. Because
of this fact and the nature of the Poynting vector EXH which describes the
flow of energy per unit time through a surface of unit area normal to the
direction of wave propagation, one can always go between descriptions of the
wave in terms of fields or in terms of power density, provided one knows the
dielectric properties of the medium and its conductivity - if any.
Roy, you mentioned resonance phenomena. One of these, the ion parametric
resonance, requires description in terms of a parameter which is the ratio of
the AC and (aligned) DC magnetic fields, multiplied by the frequency of the AC
field. When this parameter takes on certain predictable values, some cellular
effects such as inhibition of calcium ion efflux through membranes are
maximized and certain other predictable values give minimum effect - i.e.,
normal calcium ion outflow. At other values of the parameter, the effects are
intermediate and the experimental results follow the same trend predicted by
the theory. This behavior reminds me very much of quantum mechanics (or at
least of wave mechanics), although it is not truly a matter of only discrete
quantum states occurring, becuase there are experimental data showing the
existence of intermediate values of the effect between maximum and minimum.
Some papers have also dealt with the flow of electrons through biologically
interesting molecules, treating these from the viewpoint of solid state
physics. Whether any resonances associated with these electron flows have
been identified, I don't know, but I suspect that there will be resonant behavior.
I don't understand how you can expect there to be effects of EM radiation
upon living cells without there being absorption of energy. Even resonance
phenomena require some absorption of energy - even though it may be very
small. I think the SAR is a significant metric, even when you are considering
non-thermal and non-ionizing interactions. The proper description of resonant
behavior must include those dissipative terms whioch prevent the resonance
from causing an infinite response, and these terms are associated with
absorption of energy.
The mathematical description of near resonant behavior is exemplified by the
so-called resonant denominator (be it a mechanical oscillator, an electrical
oscillator, or the quantum mechancial behavior of resonant atomic and
molecular states). This expression (appearing in the denominator of a
fraction) always has the sum of two squared terms: one of these is the
difference between the energy of the system in question and the energy at
which the system goes into resonance. The other term represents the finite
width of the resonant state. If you are measuring the cross section
(probability of an event occurring expressed in the units of cross sectional
area), the width of the resonant state is the full width (on the energy axis)
at half maximum of the cross section for the process which is undergoing
resonance. Fromm the uncertainty principle, you can relate the width of the
resonant state to its lifetime. Suppose, for example, that you consider an
electron of just the right energy approaching a nitrogen molecule. The
electron will form a temporary negative ion state during which it can transfer
its energy to excitation of the nitrogen molecular vibration. If you measure
the rate at which this happens as a function of the electron energy, you will
find the kind of resonant behavior that I was describing. The cross section
peaks at about 1.7 eV electron energy, and the resonance is fairly broad.
--
----
Bill P. Curry, Ph.D. |Physics is fun.
EMSciTek Consulting Co. |Trying to make a living!
22W101 McCarron Road, |Phone: (630) 858-9377
Glen Ellyn, IL 60137 |Fax: same, but require prior notice
Home page: http://www.EMSciTek.com
____________________________________________________
| Analysis, experiment design & software development |
| for engineering and the physical sciences |
----------------------------------------------------
Archive provided courtesy of WaveGuide, http://www.wave-guide.org
Reprinted with permission of Roy Beavers, http://www.feb.se/EMF-L/EMF-L.html