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BerichtGeplaatst: 29-10-2018 09:41:04    Onderwerp: Moussa Sissoko Jersey Reageren met citaat

SAN FRANCISCO Ben Davies Hotspur Jersey , Feb. 24 (Xinhua) -- A researcher at the University of California, Berkeley, is working on a new type of lens that may do away with the classic convex piece of glass or plastic in cell phones with cameras.


Jie Yao, an assistant professor with UC Berkeley's Department of Materials Science and Engineering, is fabricating nano-thin sheets of phase change material that are glass-like at room temperature but becomes metallic when heated slightly.


The work is about "metamaterials," made of millions of nano-scale particles Victor Wanyama Jersey , each about the size of a virus, and made into arrays of nano-structures. They are so named because they perform unlike any other natural substances. Although the particles themselves are made of atoms, their novel effects on material's performance have earned them the name "artificial atoms."


With support from the Bakar Fellows Program, which fosters faculty entrepreneurship at UC Berkeley, Yao is trying to transform a natural phase change material in a way that seems like alchemy, turning some sections of the material into metal but leaving others unchanged.


The metallic portions can interact with light as if they were nanoscale antennas Toby Alderweireld Jersey , and Yao has shown that in certain conformations, the combined effect of tens of thousands of these antennas can focus light like a lens.


"The metallic phase change material is the working part of the material, while the insulating part provides the matrix to hold the 'artificial atoms' in place," Yao was quoted as saying in a news release from UC Berkeley. With a local heat source, he is able to convert part of the thin sheets into the metal antennas while letting other parts remain transparent.


"Using a local heat source, we can 'write' new structures into the material. Then Son Heung-min Jersey , by lowering the temperature, we can erase and re-write them. We can change the material's structure, and performance at will. No complicated nano-fabrication process is needed," he said.


By using this etch-a-sketch local heating strategy, his team can change the material's configuration in real time, potentially in less than a second. "In this we may be able to create a dynamic optical device Serge Aurier Jersey , for example, a single lens whose focus can be changed whenever necessary."


The interactions of the nano-antennas with light are so effective that films hundreds of times thinner than a conventional lens could tightly control the path of light that passes through the film, Yao said.


"When a broad beam of light hits the array, it can be considered as composed of many finer beams. Each new beam passes by an antenna, which is able to change its unique path."


The array can be "written" in such a way that each antenna will guide light to the same focal point to form a lens. The next moment, the array can be erased and a new array may be written Paulo Gazzaniga Jersey , and the focal point changed to another location, which could be used to improve the performance of photography and other imaging processes.


He intends to refine his technology's novel ability to tweak the metallic components' 3-D shape, and hopes to open up a range of applications to control visible light as well as infrared and microwave wavelengths.


"The material is a platform that allows us to draw any photonic structure, so we really can achieve a range of applications and transform them from static devices to dynamic ones," he said.


North Korea objected on Saturday to a ban on imports of equipment for a luxury ski resort, indicating toughened U.N. sanctions are impacting the state.


Under the leadership of North Korean leader Kim Jong-un Moussa Sissoko Jersey , who studied in the Swiss capital Berne and is believed to have enjoyed skiing in the Alps, the North has carried out work on the "Masik Pass" ski project since last year, in rivalry with South Korea which is hosting 2018 Winter Olympics.


Last week, Switzerland halted the sale to the North of equipment for a ski resort and luxury sporting goods including golf, horseback riding and water sports under the sanctions.


North Korea reportedly asked several Swiss companies to provide chair lifts and cable cars worth the equivalent of $7.24 million for its grand Masik resort.


North Korea's Skiers Association said in a statement carried by KCNA news agency on Saturday that countries should not prohibit Pyongyang from buying equipment which does not produce any rocket or nuclear weapon.


"Some countries, pressurized by the U.S. high-handed practices Mousa Dembele Jersey , are blocking the DPRK from importing even equipment to be installed in mass sports facilities such as the ski resort," an association spokesman said. North Korea's official name is the Democratic People's Republic of Korea (DPRK).


Although the statement did not elaborate on which country blocked the import, it called such a move unjustifiable and a violation of the UN Charter that states sanctions should not affect people in relevant countries.


Earlier this year, North Korea threatened nuclear and missile strikes against the United States and South Korea at the height of tensions after it was hit with UN sanctions for its February nuclear test.


(Agencies)


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