Re: Need advice regarding prohibitive measures

Re: Need advice regarding prohibitive measures

Group: rec.running Date: Thu, Mar 3, 2005, 1:04pm (EST+5) From:
[email hidden] (Doug Freese)
"Trio Funingtrain" <[email hidden]> wrote in message
news:[email hidden]... Rest the bad leg
Just run miles on the good one.
then when no pain. run on both legs.
Yo Tommie, you bikin' on the post without a seat? You might want to hang
out at Roswel for the next alien landing.
-DF

I talk to some one here last night.
from the station, it was closed butt that another storie. they not
seen....

seems the seat laws there has been down sized for lack of funds.
That what I been trying to say all the time.
trash parts work........
butt do any one Listen.
NOOOOOoooooooooooo
s.o..b. issey bound....
Way I heard a few years back. the silicons money was put to other uses.
Like important stuff.
Nano teck
hot tubs
bmw silver ones.
longer boats.

The cigar craft has been seen by me last summer as i stated.
707 took 1 - 2 miss iss ippi. 135 times
or 135×1 m i s s i s s i p p i. recount

to cross my weight lifting bar doin bench press.

the cigar shape one in u.f.o.spot watch.
or somthing.
was seen in London
africa.
and other places.
was at a speed greater then:
5 G.or 5³ or 5,000 m.p.r.
or 1 miss iss ippi i and ½ miss is gone.....
was the cigar (fat) one. like Gun die...... in movie Preditor 2...
Do you want some Gun di mun........
clip from movie.
in ref of. Aliens......

Engineers devise invisibility shield

Group: alt.discuss.science.general Date: Mon, Feb 28, 2005, 9:20pm
(EST-1) From:
by Philip Ball --
The idea of a cloak of invisibility that hides

electronic engineers have now come up with a way to make one.

Andrea Alù and Nader Engheta of the University of Pennsylvania in
Philadelphia say that a 'plasmonic cover' could render objects "nearly
invisible to an observer".

doesn't obviously violate any laws of physics.
Pendry, a physicist at Imperial College in London, UK. "It could find
uses in stealth technology and camouflage."
For example, inventor Ray Alden in North Carolina has proposed a system
of light detectors and emitters that project a replica of the scene
appearing behind an object from its front surface.

Researchers at the University of Tokyo are working on a camouflage
fabric that uses a similar principle, in which the background scene is
projected on to light-reflecting beads in the material.

But the invisibility shield proposed by Alù and Engheta in a preprint
on arXiv1 is more ambitious than this. It is a self-contained structure
that would reduce visibility from all viewing angles. In that sense it
would be more like the shielding used by the Romulans in the Star Trek
episode "Balance of Terror" in 1966, which hid their spaceships at the
push of a button.

[Scatter-brained]
The key to the concept is to reduce light scattering. We see objects
because light bounces off them; if this scattering of light could be
prevented (and if the objects didn't absorb any light) they would become
invisible. Alù and Engheta's plasmonic screen suppresses scattering by
resonating in tune with the illuminating light.

Plasmons are waves of electron density, caused when the electrons on the
surface of a metallic material move in rhythm. The researchers say that
a shell of plasmonic material will scatter light negligibly if the
light's frequency is close to the resonant frequency of the plasmons.
The scattering from the shell effectively cancels out the scattering
from the object.

For visible-light shielding, says Engheta, nature has already provided
suitable plasmonic materials: silver and gold. To reduce the scattering
of longer-wavelength radiation such as microwaves, one could make the
shield from a 'metamaterial': a large-scale structure with unusual
electromagnetic properties, typically constructed from arrays of wire
loops and coils.

Alù and Engheta's calculations show that spherical or cylindrical
objects coated with such plasmonic shields do indeed produce very little
light scattering. It is as though, when lit by light of the right
wavelength, the objects become extremely small, so small that they
cannot be seen.

[Size matters]
drawback, he points out, is the fact that a particular shield only works
for one specific wavelength of light.

An object might be made invisible in red light, say, but not in
multiwavelength daylight.

And crucially, the effect only works when the wavelength of the light
being scattered is roughly the same size as the object. So

shielding from visible light would be possible only for microscopic
objects; larger ones could be hidden only to long-wavelength radiation
such as microwaves. This means that the technology could not be used to
hide people or vehicles from human vision.

But that need not undermine other potential uses, Engheta says. For
example, the effect could be useful for making antiglare materials.

Another possible use for plasmonic screening is microscopy, he adds.
Light microscopes could surpass their usual resolution limits by using
tiny probes to measure the light field very close to the object being
imaged. Such probes could be made 'invisible' so that they don't disturb
the imaging signal.

And of course the shielding would work fine for concealing large objects
such as spaceships from sensors or telescopes that used long-wavelength
radiation instead of visible light.