Hi,

Please, somebody explain the following to me:

/ What will be the next great invention on the order of the laser? We
don't know, but clever new ideas keep coming along. The
second-place award in the technological innovation competition went
to Marin Soljacic (MIT) for his concept of wireless, non-radiative
energy transmission. Just as in the quantum case in which the
Schrodinger equation allows for a wave trapped in a box to tunnel
out, so Maxwell's equations allow for the leakage of electromagnetic
energy from an electromagnetic resonance object. If another such
object were placed not far from the first one, and the resonant
frequencies of both were the same, then the energy could be
transferred between them with very little energy lost to other
objects in the nearby environmental that do not share the same
resonant frequency. The transmitted energy, although
electromagnetic in nature, would not be referred to as "radiation"
since it is bound to the resonant objects. It is rather an example
of "near-field" physics. Soljacic avoids words like "antenna,"
since the process does not involve broadcasts of energy in the usual
sense. In contrast, the vast majority of energy radiated by
antennas is typically wasted and lost into free space, while only a
small portion is picked up by the eventual receivers. Instead,
Soljacic uses terms like "source" and "drain" in analogy with
transistors to describe the movement of energy. An exemplary setup
might consist of a transmitter in a ceiling and devices in that room
(e.g robots, or computers) being powered wirelessly by this energy.
/

A*s*i*m*o*v


.... Light at the end of the tunnel may be an oncoming train!

On Sun, 16 Oct 2005 22:06:33 GMT, "Asimov"
wrote:

Hi,

Please, somebody explain the following to me:

it is called parsing:

/ What will be the next great invention on the order of the laser? We
don't know, but clever new ideas keep coming along.

The usual side-show opening.

[material that followed and not included here, parsed to 0]

The transmitted energy

the radiated energy [need one actually go on?]

, although electromagnetic in nature

electromagnetic transmitted energy

would not be referred to as "radiation" since it is bound to the resonant objects.

All things resonant radiate - a fact of life

If the authors intend that the energy moves by any method, even by a
speculative means, resonance is immaterial.

It is rather an example of "near-field" physics.

which is a characteristic of radiation

Soljacic avoids words like "antenna,"

How do you make a chocolate cake when the recipe does not call for
chocolate? Use Cocoa.

since the process does not involve broadcasts of energy in the usual
sense.

in the un-usual sense does not change physics, it simply changes an
expression to un-chocolate cake.

[material that followed and not included here, parsed to 0]

An exemplary setup
might consist of a transmitter in a ceiling and devices in that room
(e.g robots, or computers) being powered wirelessly by this energy.

and have been with us since Tesla. They are called transformers.

Asimov wrote:
"The transmitted energy, although electromagnetic in nature, would not
be referred to as "radiation" since it is bound to the resonant
objects."

A mistaken idea is expressed above. Radiation happens from conductors
carrying radio frequencies. Radiation escapes. That`s a definition of
radio. It`s the energy that gets away. It may be hard to contain.

When a conductor is swept by r-f, the current which flows upon or within
a conductor depends on its impedance. Unless the conductor is without
significant reactance, little current flows. A resonant, and
low-resistance conductor may have a large current flow, depeending also
on the strength of the electromagnetic (r-f) field.

Induced current on a conductor will all be re-radiated if there is no
loss to a load or heat conversion. There is coupling between source and
receiving conductors. A synonym is mutual impedance. Maximum available
power out to a load on an antenna is 50% of that captured. The other 50%
is lost in the antenna`s source impedance (its radiation resistance). In
other words, it is re-radiated.

Mutual impedance does not trap energy on or in a conductor or limit
excitation of multiple conductors.

Necessity is said to be the mother of invention. Identify the greatest
needs and you may forecast some invention.

Best regards, Richard Harrison, KB5WZI

All just symmantics.

HOWEVER...

OT, but... For something that sounds too good to be true search on "Woody"
Elwood G. Norris. I researched this and he has something here. Not
previously unknown, just previously unused.

HyperSonicTM Sound by Elwood G. Norris 6/07/97


73, Steve, K.9.D;C'I


"Asimov" wrote in message
...
Hi,

Please, somebody explain the following to me:

/ What will be the next great invention on the order of the laser? We
don't know, but clever new ideas keep coming along. The
second-place award in the technological innovation competition went
to Marin Soljacic (MIT) for his concept of wireless, non-radiative
energy transmission. Just as in the quantum case in which the
Schrodinger equation allows for a wave trapped in a box to tunnel
out, so Maxwell's equations allow for the leakage of electromagnetic
energy from an electromagnetic resonance object. If another such
object were placed not far from the first one, and the resonant
frequencies of both were the same, then the energy could be
transferred between them with very little energy lost to other
objects in the nearby environmental that do not share the same
resonant frequency. The transmitted energy, although
electromagnetic in nature, would not be referred to as "radiation"
since it is bound to the resonant objects. It is rather an example
of "near-field" physics. Soljacic avoids words like "antenna,"
since the process does not involve broadcasts of energy in the usual
sense. In contrast, the vast majority of energy radiated by
antennas is typically wasted and lost into free space, while only a
small portion is picked up by the eventual receivers. Instead,
Soljacic uses terms like "source" and "drain" in analogy with
transistors to describe the movement of energy. An exemplary setup
might consist of a transmitter in a ceiling and devices in that room
(e.g robots, or computers) being powered wirelessly by this energy.
/

A*s*i*m*o*v


... Light at the end of the tunnel may be an oncoming train!