Reuse this content Matildas’ winning run ends with goalless draw against Portugal Share on Twitter Australia sport Share on Messenger Share on Facebook The Matildas claimed a deserved 2-0 win over China but the scoreline fell short of delivering an Algarve Cup final appearance.Injury-hit Australia endured some unlucky moments and at times struggled to break down a compact China in their third and final group match. Matildas In the end, Chloe Logarzo and Sam Kerr found the net to hand Alen Stajcic’s side a third-place play-off against host nation Portugal on Thursday.Despite scoring eight goals against China over November’s two friendlies, the world No 4 Matildas could not deliver the four required here to make the final of the invitational tournament, key preparation for next month’s World Cup qualifiers.Their 14th-ranked counterparts had the better of the first-half chances, and Australia could thank some resolute defending for their half-time clean sheet.Wang Shuang sent a golden chance begging, swiping wide on the break, and Wang Shanshan had a crack that MacKenzie Arnold gathered comfortably.China allowed Kerr little of the ball and the Matildas, toiling in a bid to dictate the midfield rhythm, could not find a clear passage.One opened up in the 30th minute when goalkeeper Wang Fei fumbled Elise Kellond-Knight’s free kick. Kerr toe-poked home but was ruled to have fouled Wang.A lifeline finally materialised after the break. Alanna Kennedy, who played well throughout, put in a precise ball and Logarzo finished with finesse, looping a header over Wang Fei.It opened the game up with Lisa De Vanna skying a sitter and Wang Shanshan heading marginally wide. Logarzo then fired in a shot from 25 metres out but her effort bounced cruelly off the post.China came close to a late equaliser from a free kick following a foul by Kennedy; Arnold saved and then spilled Wang Shuang’s subsequent free-kick but Kerr was on hand for the vital clearance.Kerr finally converted a chance at the death, clipping a lob past the onrushing keeper that sailed into the far corner.Sweden and the Netherlands qualified for the final. Share on WhatsApp Read more Share via Email Topics Share on Pinterest Share on LinkedIn news Women’s football
© 2015 Phys.org More information: Anders Pors, et al. “Analog Computing Using Reflective Plasmonic Metasurfaces.” Nano Letters. DOI: 10.1021/nl5047297 Citation: Metasurface solves calculus problems as an analog computer (2015, January 12) retrieved 18 August 2019 from https://phys.org/news/2015-01-metasurface-calculus-problems-analog.html Plot of the reflection coefficient, r, as a function of nanobrick dimensions. The inset shows a gold nanobrick on top of a glass spacer and gold substrate. This study marks the first time that the amplitude and phase of the reflected light are controlled simultaneously and independently, by varying the dimensions of the nanobricks. Credit: Pors, et al. ©2014 American Chemical Society This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Scientists have demonstrated that a 2-D man-made material called a metasurface can perform spatial differentiation and integration, the two main types of calculus problems, when illuminated by a laser beam. Essentially, the metasurface transforms the shape of the incoming light wave profile (the input) into the shape of its derivative or integral (the output). The achievement requires very precise control of light at the nanoscale—specifically, controlling both the amplitude and the phase of the reflected light at the same time. Explore further While amplitude and phase have previously been controlled individually, this study marks the first time that the two properties are controlled simultaneously and independently by varying the dimensions of the metallic scatterers, representing unprecedented control of light at the nanoscale.”We believe the greatest significance is, in fact, not analog computing but the possibility to simultaneously control the amplitude and phase of reflected light at visible frequencies,” Pors told Phys.org. “As mentioned in the conclusion of the article, this allows for new operations of metasurfaces, like the generation of complex wave fronts or information storage in (phase- and amplitude-controlled) holograms. Moreover, one could envision metasurface plates being used as add-ons in optical microscopes—for example, for edge-detection imaging by calculating the second derivative, or phase imaging using a Zernike plate.”He explained that there are several potential advantages of analog computing that have attracted recent attention to the subject.”The renewed interest comes from the possibility of using light instead of an electrical signal or mechanical motion, which can allow for faster computation in a compact setup,” Pors said. “In general, researchers hope in the future to replace electrical signals with light because the frequency of light is much higher than GHz operation typically used in electronics. Light, however, cannot conventionally be squeezed down to the dimensions of electronics, which is the reason why electronics dominates, with light mainly being used to transfer huge amounts of data over long distances. Regarding analog versus digital computation, analog computations have the advantage that the input signal doesn’t have to be converted to a digital stream of bits, meaning that analog operations don’t suffer from conversion delays; i.e., it can be faster than digital computations.”In the future, the researchers plan to investigate the wider potential of metasurfaces.”We will not solely focus on analog computing, but continue exploring the possibilities of using gradient metasurfaces to control light and design new spectacular/important functionalities,” Pors said. Scanning electron microscopy (SEM) images of fabricated 50 x 50 µm2 (a) differentiator and (b) integrator metasurfaces. Credit: Pors, et al. ©2014 American Chemical Society Journal information: Nano Letters The researchers, Anders Pors, Michael G. Nielsen, and Sergey I. Bozhevolnyi at the University of Southern Denmark, have published their paper on the new metasurface in a recent issue of Nano Letters.Somewhat unexpectedly, the work builds on recent research on analog computing, which is based on continuous values, rather than incremental values as used digital computing. The new metasurface uses continuous values of the phase and amplitude of light to perform the calculus operations, making it an example of analog computing. The concept of analog computers may conjure up images of slide rules and other old-fashioned tools that were replaced by digital computers in the 1960s and ’70s. But last year, a team of researchers (A. Silva, et al.) presented simulations suggesting that metamaterials can perform computational tasks in an analog fashion—that is, by using continuous optical fields rather than discrete bits to represent data. That work showed that metasurfaces have the advantage of being extremely thin—orders of magnitude smaller than conventional optical elements such as bulky lenses or wave plates. Their thinness potentially allows for the design of miniaturized, compact optical circuits, with analog computing as one unique application. In the new study, the researchers from Denmark demonstrated a practical approach to realize compact analog computing using metasurfaces. In general, metasurfaces consist of an array of tiny metallic scatterers that are smaller than the wavelength of the light passing through them. New hologram technology created with tiny nanoantennas Here, the researchers used gold nanobricks as the scatterers, placed on top of a silicon dioxide spacer and a gold film. When an 800-nm laser beam illuminates the metasurface, the light excites gap-surface plasmons that propagate in the spacer region between the nanobricks and gold film, resulting in reflected light whose amplitude and phase are determined by the sizes of the nanobricks.
Kolkata: Be it Avenue Road in Bangalore or College Street in Kolkata, both the places attract avid readers from all over the country.Although the online markets for books were able to draw a gloomy face over the book sellers, both these places are still able to hold up their traditional history in book culture, selling a rare variety of books for affordable rates that the online start ups cannot afford to offer.While other book shops carry a price tag, these places don’t, the price of the books depends on the seller-buyer bargaining sessions. Also Read – Heavy rain hits traffic, flights It’s the smell of old books and the fact that books go on to have a second life is the very essence of both these places.Avenue Road is a locality in Bengaluru, one of the few places known for its traditional trade in used textbooks. These shops are found on one side of the lane, with other one being homes and shops to others. These shops in Karnataka are more than 5 decades old. One can buy second-hand books and sell them in return of new books or money. It has around 70 bookshops and 350 street booksellers. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedThe category of books varies from fiction, textbooks and coaching books for many competitive exams. The wide range of textbooks on Avenue road attracts students from all fields and ready to travel from faraway places.If you are a book lover and have visited the place for at least once, the scent of Avenue Road will never disappear from your memory. Kolkata, rich in its cultural heritage and literature, even to the present day, doesn’t fail to attract ardent bibliophiles from all over the world to the largest second hand book market in India. College Street, a mile long stretch of small and big bookshops spread across pavements, streets and by lanes, has a remarkable history of more than 200 years. The stretch of this bustling book market is so engaging and captivating that one can while away time by browsing through the stacks for hours. College Street spans multiple genres like literary classics, British and American Literature, books on politics, Indian literature, educational textbooks, fiction, fantasy and self help books. This place witnesses a wide range of avid bibliophiles from all backgrounds and age groups. All of these ardent book lovers try their best to get their hands on both old and new books at reasonable prices after a ‘must’ bargaining session. One cannot forget to mention the booksellers, while talking about the avid readers. The booksellers are so passionate that they call everyone walking around to have a good look at the walls piled up with books. They simultaneously search for other books which the readers would be interested in and spew out titles by Tagore or Dicken’s.Apart from their distinct assemblage of various hits such as Dan Brown, one can find rare editions, bestsellers of yesteryears as well. It’s the rarity of these books which motivates the bookworms to flock to pavements for throwaway prices. One cannot forget going to the traditional 300-year-old Indian Coffee House, which is considered the meeting place for city’s intelligentsia. This ‘adda’ provides a perfect ambience for variety of people. It used to be a favorite hang out for young poets, painters, writers, painters, filmmakers and politicians. Remember to drop there for a cup of chai and samosa to get the essence of Kolkata. This stretch of books in College Street with the best to the rarest collections, has given it an endearing name ‘boi para’.A trip to Boi Para, the heart of Kolkata, is a must for every book lover in search of treasure chests of books and civilised pleasure. The satiety of buying books in ardent book lovers will not be fulfilled with one visit, it calls for another, again and again. Robert Southey once said, “My never-failing friends are they, With whom I converse day by day”.