| Topic: |
Science > Physics |
| User: |
"Sam Wormley" |
| Date: |
19 Oct 2006 10:50:13 PM |
| Object: |
Materials that can hide objects from prying eyes |
Invisibility cloak unveiled in the US (Oct 19)
http://physicsweb.org/article/news/10/10/12
A mainstay of science fiction and prized possession of the young wizard
Harry Potter, the invisibility cloak is also of great interest to the
defense and intelligence communities. As a result, a great deal of
research (both secret and public) has gone into the development of
materials that can hide objects from prying eyes -- or at least radar
systems. Now researchers in the US and the UK have claimed the first
public success (Science).
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| User: "Helmut Wabnig" |
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| Title: Re: Materials that can hide objects from prying eyes |
20 Oct 2006 02:49:27 AM |
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On Fri, 20 Oct 2006 03:50:13 GMT, Sam Wormley <swormley1@mchsi.com>
wrote:
Invisibility cloak unveiled in the US (Oct 19)
http://physicsweb.org/article/news/10/10/12
A mainstay of science fiction and prized possession of the young wizard
Harry Potter, the invisibility cloak is also of great interest to the
defense and intelligence communities. As a result, a great deal of
research (both secret and public) has gone into the development of
materials that can hide objects from prying eyes -- or at least radar
systems. Now researchers in the US and the UK have claimed the first
public success (Science).
Rumors have it that end WW2 the Germans had already developed
a black anti reflective radar tarnish. Back then radar was at rather
low frequencies. Today we equip children's toys within that range.
The rumors proceed telling the person who handed out the paint
to the investigators was allowed to settle in the U.S. and live there.
There are reports how they tried to cover U-boat towers with
a mat made of thousands of resistors, 377 ohm each. Theoretically
the resistor grid will absorb radiation down to lambda ~ mesh size.
It is not that their efforts were all unsuccessful, rather it was too
little too late. But today nobody can claim to be the first one.
w.
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| User: "" |
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| Title: Re: Materials that can hide objects from prying eyes |
20 Oct 2006 03:02:22 AM |
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In article <04vgj2lpho13a1ehuth01ppdcp9vhbtntf@4ax.com>, Helmut Wabnig <hXXXwabnig@aXXXon.at> writes:
On Fri, 20 Oct 2006 03:50:13 GMT, Sam Wormley <swormley1@mchsi.com>
wrote:
Invisibility cloak unveiled in the US (Oct 19)
http://physicsweb.org/article/news/10/10/12
A mainstay of science fiction and prized possession of the young wizard
Harry Potter, the invisibility cloak is also of great interest to the
defense and intelligence communities. As a result, a great deal of
research (both secret and public) has gone into the development of
materials that can hide objects from prying eyes -- or at least radar
systems. Now researchers in the US and the UK have claimed the first
public success (Science).
Rumors have it that end WW2 the Germans had already developed
a black anti reflective radar tarnish. Back then radar was at rather
low frequencies.
Not so low, actually. As I recall, 3cm radar was already in use
toward the end of the war. This is not much lower than what is used
nowadays since at significantly shorter wavelengths atmospheric
absorption becomes a serious issue.
Today we equip children's toys within that range.
The rumors proceed telling the person who handed out the paint
to the investigators was allowed to settle in the U.S. and live there.
There are reports how they tried to cover U-boat towers with
a mat made of thousands of resistors, 377 ohm each. Theoretically
the resistor grid will absorb radiation down to lambda ~ mesh size.
It is not that their efforts were all unsuccessful, rather it was too
little too late. But today nobody can claim to be the first one.
w.
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
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| User: "" |
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| Title: Re: Materials that can hide objects from prying eyes |
20 Oct 2006 09:55:03 AM |
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wrote:
In article <04vgj2lpho13a1ehuth01ppdcp9vhbtntf@4ax.com>, Helmut Wabnig <hXXXwabnig@aXXXon.at> writes:
On Fri, 20 Oct 2006 03:50:13 GMT, Sam Wormley <swormley1@mchsi.com>
wrote:
Invisibility cloak unveiled in the US (Oct 19)
http://physicsweb.org/article/news/10/10/12
A mainstay of science fiction and prized possession of the young wizard
Harry Potter, the invisibility cloak is also of great interest to the
defense and intelligence communities. As a result, a great deal of
research (both secret and public) has gone into the development of
materials that can hide objects from prying eyes -- or at least radar
systems. Now researchers in the US and the UK have claimed the first
public success (Science).
Rumors have it that end WW2 the Germans had already developed
a black anti reflective radar tarnish. Back then radar was at rather
low frequencies.
Not so low, actually. As I recall, 3cm radar was already in use
toward the end of the war. This is not much lower than what is used
nowadays since at significantly shorter wavelengths atmospheric
absorption becomes a serious issue.
Early radar was in the low VHF range with frequencies as low as 50 MHz.
As the war progressed and experience gained, frequencies climbed to
VHF to UHF.
It wasn't until the British invented the magnetron and the Americans
figured out how to produce them in quantity that radar went into the
cm range.
Full scale field deployment started around 1942 or 1943 as I recall.
The Allies didn't share the technology with the Axis powers.
It took a while to replace all existing systems so VHF and UHF radars
were still around after the war.
--
Jim Pennino
Remove .spam.sux to reply.
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| User: "" |
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| Title: Re: Materials that can hide objects from prying eyes |
21 Oct 2006 01:41:36 AM |
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In article <lg4n04-4f2.ln1@mail.specsol.com>, writes:
mmeron@cars3.uchicago.edu wrote:
In article <04vgj2lpho13a1ehuth01ppdcp9vhbtntf@4ax.com>, Helmut Wabnig <hXXXwabnig@aXXXon.at> writes:
On Fri, 20 Oct 2006 03:50:13 GMT, Sam Wormley <swormley1@mchsi.com>
wrote:
Invisibility cloak unveiled in the US (Oct 19)
http://physicsweb.org/article/news/10/10/12
A mainstay of science fiction and prized possession of the young wizard
Harry Potter, the invisibility cloak is also of great interest to the
defense and intelligence communities. As a result, a great deal of
research (both secret and public) has gone into the development of
materials that can hide objects from prying eyes -- or at least radar
systems. Now researchers in the US and the UK have claimed the first
public success (Science).
Rumors have it that end WW2 the Germans had already developed
a black anti reflective radar tarnish. Back then radar was at rather
low frequencies.
Not so low, actually. As I recall, 3cm radar was already in use
toward the end of the war. This is not much lower than what is used
nowadays since at significantly shorter wavelengths atmospheric
absorption becomes a serious issue.
Early radar was in the low VHF range with frequencies as low as 50 MHz.
As the war progressed and experience gained, frequencies climbed to
VHF to UHF.
It wasn't until the British invented the magnetron and the Americans
figured out how to produce them in quantity that radar went into the
cm range.
Yes, exactly.
Full scale field deployment started around 1942 or 1943 as I recall.
The Allies didn't share the technology with the Axis powers.
For rather obvious reasons:-)
It took a while to replace all existing systems so VHF and UHF radars
were still around after the war.
Sure. There was no great hurry at this point, except for critical
applications.
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
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| User: "PD" |
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| Title: Re: Materials that can hide objects from prying eyes |
20 Oct 2006 07:46:27 AM |
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Sam Wormley wrote:
Invisibility cloak unveiled in the US (Oct 19)
http://physicsweb.org/article/news/10/10/12
A mainstay of science fiction and prized possession of the young wizard
Harry Potter, the invisibility cloak is also of great interest to the
defense and intelligence communities. As a result, a great deal of
research (both secret and public) has gone into the development of
materials that can hide objects from prying eyes -- or at least radar
systems. Now researchers in the US and the UK have claimed the first
public success (Science).
Gee, and concrete seems to work so well already.
PD
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| User: "tj Frazir" |
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| Title: Re: Materials that can hide objects from prying eyes ( heat )morons |
21 Oct 2006 11:06:19 PM |
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Cloke IS A FUCKING JOKE.
standing on deck on a hot day you cant see the entire deck.
Stand in the hot sand and Ill hide my fucking hat dumbasses.
Poeple are fucking retared as *****.
I can hide the road MORONS .
on a hot day .
what a fuckin joke !!
is sam so fucking stuuuupid ??? OH ***** YES HE IS so fucking stupid.
IDITOT
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