Two independent groups of physicists have built invisibility cloaks that can shield large objects lying on a plane. These "carpet cloaks" are far closer to the intuitive idea of an invisibility cloak than devices previously built, they argue, because they hide objects that can be seen with the naked eye and do so at visible wavelengths. The cloaks are also relatively cheap and easy to make, being constructed from the natural material calcite.
Group items tagged
NASA - X-48B: Eighty Flights, Priceless Facts - 2 views
-
looks nice!
Invisibility cloaks shield the large and visible - physicsworld.com - 1 views
-
-
The team used a technique known as transformation optics to design their cloak.
-
Tomas Tyc of Masaryk University in the Czech Republic, who was not a member of either group, thinks that the papers "describe important achievements in the area of experimental cloaking." But he maintains that a carpet cloak is quite different to a fully fledged Harry Potter-style invisibility cloak. He points out that a carpet cloak only really works when viewing an object – be it a rucksack or a sword on someone's back, for example – side on. Otherwise the object will appear flat but still be visible.
Airbus Concept Cabin - 3 views
-
Another futuristic view on flying by Airbus. To make it more sexy it also includes some biomimetics...
-
"The cabin electrical system can be compared to the human brain, with a network of intelligence pulsating through the cabin.". Oh, come on, ...
BBC NEWS | Science & Environment | Round-the-world solar plane debut - 0 views
-
It's the wrong Cpt. Picard, but nevertheless...
Forget Dark Matter: This Astrophysicist Found the Fastest Way to Board a Plane - 0 views
-
these astrophysicists are universally employable ...
GPS Navigation Could Boost Fuel Efficiency on Oceanic Flights | Autopia from Wired.com - 0 views
-
for Franco - nothing revolutionary to me but OK ...
Track Flight Status - 0 views
Hypersonic Successor to Legendary SR-71 Blackbird Spy Plane Unveiled - 1 views
-
he new SR-72 will use a turbine-based combined cycle (TBCC) that will employ the turbine engine at lower speeds, and use a scramjet at higher speeds. A scramjet engine is designed to operate at hypersonic velocities by compressing the air through a carefully designed inlet, but needs to be traveling supersonic before it is practical to begin with. So far research projects from NASA, the Air Force and other Pentagon entities have not been able to solve the problem of transitioning from the subsonic flight regime, through hypersonic flight with a single aircraft. Same problem as Reaction Engines is trying to solve, so I am not sure whether they actually cracked it. In any case, nice pictures. Not sure why the exhaust color is purple in color. Its not running on Argon I believe.
-
Weird article. Intermediate thruster stage (Ramjet) is missing. Scramjet has supersonic combustion and a normal turbine delivers subsonic flows. Even with afterburner - the Scramjet inlet would decelerate the flow down to subsonic velocity with "normal" subsonic combustion. The only thing I can imagine is that the Scramjet stage is bi-functional and covers both, subsonic and supersonic combustion. But the article doesn't say anything about it.
‹ Previous
21 - 31 of 31
Showing 20▼ items per page