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Saturday, January 28, 2012
Thursday, January 26, 2012
Cloak's on you: Scientists create 'invisible' object
by Martin LaMonica January 26, 2012 7:04 AM PST
This image demonstrates at which frequencies the 3-D cloaking experiment worked successfully, with the third band showing the upper range of the microwave scattering.
It's not quite the Invisible Man, but researchers say they have gotten a step closer to creating a "three-dimensional cloak" that would render objects invisible.
Scientists at the University of Texas in Austin today said they have hidden a cylinder from microwaves, demonstrating cloaking of an object in free space, rather than a two-dimensional image. The group has not been able to scatter visible light, but it expects that cloaking small objects is possible.
"Cloaking small objects may be exciting for a variety of applications. For instance, we are currently investigating the application of these concepts to cloak a microscope tip at optical frequencies. This may greatly benefit biomedical and optical near-field measurements," said University of Texas assistant professor Andrea Alu in a statement. He is co-author of a paper published today in the Institute of Physics and German Physical Society's New Journal of Physics.
Researchers for years have been designing synthetic materials to coat an object and make it appear transparent. In its experiment, the University of Texas group covered a cylinder with a shell coated with a nanometer-sized plasmonic material that scatters light and other electromagnetic waves.
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When we see an object, our eyes receive the reflection of light rays off that object and our brain processes that visual information. At certain frequencies, plasmonic materials can excite electron oscillations that make the light waves scatter in a way that counteracts the normal reflection, according to the University of Texas. The effect is to make it appear transparent.
The paper says that the plasmonic materials work regardless of the shape of the object and, in principle, could work on a broader range of frequencies, including visible light. But there appear to be some limitations on what sorts of materials it will work on. The experiment worked on a dielectric object but not on metals, according to a description from the University of Texas.
In the future, though, portions of aircraft could be covered or optical instruments could use the material to correct effects. "We believe that our results pave the way to realistic, practical applications of 3D stand-alone cloaks for radar evasion and non-invasive radio frequency probing," according to the paper.
Correction at 9:15 a.m: Andrea Alu's gender has been corrected.
Martin LaMonica
Martin LaMonica is a senior writer covering green tech and cutting-edge technologies. He joined CNET in 2002 to cover enterprise IT and Web development and was previously executive editor of IT publication InfoWorld.
Tuesday, January 24, 2012
Hi-Tech MOM
A couple of years back an NRI a friend of ours visited us. I had prepared some Indian delicacies in his honor. In between I attended calls on my mobile and messeges on my PC. He (guest) remarked, Wow ! bhabhi you have gone hi tech. I just smiled.
During those days my daughter was staying in London. I was frantically keen on talking to her on ‘skype.’ I insisted my hubby to buy a LapTop for me “We have a PC ”he remarked , “ Why cant we buy one LapTop” i insisted again. “ Do the young ones only need it.?” My thoughts raced to the ad of famous actress Kareena Kapoor flambyontly dressed and displaying my favourite colour(red) Laptop. I wanted desperately. It had all the recent software applications and above all the model was sleek and light weight.
My daughter was thrilled to see this beautiful piece on my bed.
“Your Dad gifted me.” .I exclaimed. Seeing her on the screen and talking had appeased my anxiey. “Mom! Why don’t you open a blog?” I was new to this term. Soon I learnt to write my blog. Now daily after my household chores I dash to my bed and do all the reading writing and listening to music on my lap. On my cosy bed .
The adventure does not stop here.
As I open my mail, there are warning of hackers! Etc.
But there are mails from my new Facebook friends. Daily chatting , commenting and writing sharing our thoughts has opened new vision to my mind.
Change has definitely come in our home with the change in me.
I saved all my important information in separate files. And stored them in my pendrive. Instead of carrying my laptop I carry my pendrive at outstation. I consider my Laptop most precious .
All the informations etc are getting nano…compressed…smaller and smaller. The technology deals with atoms the smallest particles of a matter. But the decoding of atom, it consists of particles, the electrons and protons..which are infinitial small particles , they are the base of recent research .
My study in spirituality deals with abstractness . The Yogis travel in space through such fine (atomic) level bodies, I learnt.
The West is also in the race to travel in space and are reaching the distant stars. Men have walked on the Moon years back. Now the distant planet (Mars) is our next destination. Another decade will unravel the truths of Mars how mankind can make the place habitable.
The Recent Kepler Telescope
"is specifically designed to survey our region of the Milky Way galaxy to discover hundreds of Earth-size and smaller planets in or near the habitable zone and determine how many of the billions of stars in our galaxy have such planets." The telescope is named after JohannesKepler,an astronomer, astrologist and mathematician fromGermany in the late1500 and early 1600s.(Wikipedia)
I receive mails(videos) from n no of foundations. Recent talks from the revered holy men, scientists . Its simply amazing! My late night working on my laptop. Tweeting , chatting on Facebook is the most entertaining.
Reading Stephen Hawking, he says we shall soon travel in Space to different planets if we survive this accumulation of Nuclear Warheads. God knows what is written in our fate if the demons get control over them.
I Tweet with (Stephen Hawing) .More years and Blessing of God on his 70th Birthday .
Reminiscing the famous quote of Omar Khayyam:
“The moving finger writes, and having written moves on. Nor all thy piety nor all thy wit, can cancel half a line of it.”
Prajakta Dighe,
y
During those days my daughter was staying in London. I was frantically keen on talking to her on ‘skype.’ I insisted my hubby to buy a LapTop for me “We have a PC ”he remarked , “ Why cant we buy one LapTop” i insisted again. “ Do the young ones only need it.?” My thoughts raced to the ad of famous actress Kareena Kapoor flambyontly dressed and displaying my favourite colour(red) Laptop. I wanted desperately. It had all the recent software applications and above all the model was sleek and light weight.
My daughter was thrilled to see this beautiful piece on my bed.
“Your Dad gifted me.” .I exclaimed. Seeing her on the screen and talking had appeased my anxiey. “Mom! Why don’t you open a blog?” I was new to this term. Soon I learnt to write my blog. Now daily after my household chores I dash to my bed and do all the reading writing and listening to music on my lap. On my cosy bed .
The adventure does not stop here.
As I open my mail, there are warning of hackers! Etc.
But there are mails from my new Facebook friends. Daily chatting , commenting and writing sharing our thoughts has opened new vision to my mind.
Change has definitely come in our home with the change in me.
I saved all my important information in separate files. And stored them in my pendrive. Instead of carrying my laptop I carry my pendrive at outstation. I consider my Laptop most precious .
All the informations etc are getting nano…compressed…smaller and smaller. The technology deals with atoms the smallest particles of a matter. But the decoding of atom, it consists of particles, the electrons and protons..which are infinitial small particles , they are the base of recent research .
My study in spirituality deals with abstractness . The Yogis travel in space through such fine (atomic) level bodies, I learnt.
The West is also in the race to travel in space and are reaching the distant stars. Men have walked on the Moon years back. Now the distant planet (Mars) is our next destination. Another decade will unravel the truths of Mars how mankind can make the place habitable.
The Recent Kepler Telescope
"is specifically designed to survey our region of the Milky Way galaxy to discover hundreds of Earth-size and smaller planets in or near the habitable zone and determine how many of the billions of stars in our galaxy have such planets." The telescope is named after JohannesKepler,an astronomer, astrologist and mathematician fromGermany in the late1500 and early 1600s.(Wikipedia)
I receive mails(videos) from n no of foundations. Recent talks from the revered holy men, scientists . Its simply amazing! My late night working on my laptop. Tweeting , chatting on Facebook is the most entertaining.
Reading Stephen Hawking, he says we shall soon travel in Space to different planets if we survive this accumulation of Nuclear Warheads. God knows what is written in our fate if the demons get control over them.
I Tweet with (Stephen Hawing) .More years and Blessing of God on his 70th Birthday .
Reminiscing the famous quote of Omar Khayyam:
“The moving finger writes, and having written moves on. Nor all thy piety nor all thy wit, can cancel half a line of it.”
Prajakta Dighe,
y
Sunday, January 22, 2012
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