Month: August 2019


  • Sharps New Semiconductor Laser for Triple and Quadruple Layer Bluray Discs

    first_img Sharp announced its new development in Japan earlier this month, at the Japan Society of Applied Physics’ 70th Autumn meeting.The semiconductor laser is blue-violet, producing an optical output up to 500 mW and 405 nm wavelength of oscillation under pulsed operation. The new laser has been proven reliable over 1,000 hours of testing.The device is designed to be used in Blu-ray Disc recorders, and can write at 8 x speed on both triple- and quadruple- layer discs. This would mean recordable discs (with 25 GB per layer at present) to be 75 or 100 GB. The development follows the mass production of a 320 mW blue-violet semiconductor laser starting in June this year. The 320 mW device can write at 8 x speed on single- and dual- layer discs.The optical output of the laser was improved by changing the way the edge of the semiconductor laser crystal is processed. Previous devices have covered the semiconductor laser crystal with a non-crystalline film, but this method allowed heat to degrade the crystal and eventually stop oscillation. The new process uses an AION (aluminum oxynitride) crystalline coating between the dielectric film and the semiconductor crystal’s edge face. This allows the laser output to be increased.Sharp announced it is ready to produce the new semiconductor laser, but is holding off until triple and quadruple layer disc specifications are settled.© 2009 PhysOrg.com A cross-sectional image of the semiconductor laser with an aluminum oxynitride film. Explore further 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. Sharp to Begin Volume Production of High-Power 210-mW Blue-Violet Laser Diodes Citation: Sharp’s New Semiconductor Laser for Triple- and Quadruple- Layer Blu-ray Discs (2009, September 18) retrieved 18 August 2019 from https://phys.org/news/2009-09-sharp-semiconductor-laser-triple-quadruple-.html (PhysOrg.com) — Sharp Corporation has announced the development of a new 500 mW semiconductor laser for triple- and quadruple- layer Blu-ray discs.last_img read more

  • Supermarket robot to help the elderly w Video

    first_img © 2009 PhysOrg.com (PhysOrg.com) — Robovie-II, a retail-assistant robot designed to help elderly and disabled people shop in supermarkets, is being tested in Kyoto, in Japan. New robot skier takes to the slopes (w/ Video) One of the approximately 20 elderly shoppers taking part in the experiments said it was fun shopping with the robot, and it reminded her of shopping with her grandchild. She said she didn’t get tired because the robot carried the shopping basketJapan has an aging population and a love of consumer culture and technology, and the retail assistant robot is expected to be well-received. ATR sells a range of robots, and according to the Director of ATR Intelligent Robotics and Communication Laboratories, Norihiro Hagita, the company is aiming to develop robots that can serve people with special needs, such as the elderly.The system is being tested until March 2010 at the Apita-Seikadai supermarket in Kyoto. The child-sized robot was developed from an earlier version of the Robovie-II humanoid robot designed by Advanced Telecommunications Research Institute International (ATR), which is based in Kansai Science City, or “Keihanna Science City”. Along with other digital technologies and sensors, the company hopes the robot will make shopping easier and more entertaining for elderly people, helping them remember what is on their list, guiding them to the items, and carrying the groceries for them. Citation: Supermarket robot to help the elderly (w/ Video) (2009, December 17) retrieved 18 August 2019 from https://phys.org/news/2009-12-supermarket-robot-elderly-video.htmlcenter_img Explore further More information: In Japanese: robot.watch.impress.co.jp/docs … 20091214_335825.html 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. Before leaving home, a shopper enters his or her shopping list into a mobile device that displays an avatar of the robot. When the shopper arrives at the supermarket, sensors detect the mobile device and the shopping list data is transmitted wirelessly to a waiting retail-assistant robot. The robot then greets the shopper by name and says “Let’s go shopping,” and then follows them through the store, helping them find the items on the list, and carrying the goods in a shopping basket.As they travel through the supermarket the robot reminds the shopper of items on the list, and makes recommendations and suggestions of other items that would go well with items on the list (such as lettuce with other salad items), and makes comments on how delicious foodstuffs look.last_img read more

  • Robotic arm simulates driving a Ferrari w Video

    first_img The device, called the CyberMotion Simulator, was created by Paolo Robuffo Giordano and colleagues at the Max Planck Institute for Biological Cybernetics, in Tübingen, Germany, and recently presented at the ICRA 2010 conference. Their goal was to make the experience of driving a Ferarri F2007 as realistic as possible in order to better understand how humans experience the sensation of motion, which in turn could provide insight into the cognitive processes of the brain. The robotic arm simulates the player’s steering of the car in a video game. The researchers also wanted to test the simulator in an environment that requires quick and massive acceleration. The CyberMotion Simulator has a delay of just 40 milliseconds, and allows players to be freely displaced in six degrees of freedom in space, including upside-down.The robotic arm is a Robocoaster that the researchers modified on a six-axis Kuka KR 500, which has the ability to lift up to 500 kg. The system is often used in amusement parks but normally does not allow users any control. The researchers predict that the CyberMotion Simulator could be adapted to experiences in addition to car racing, such as controlling airplanes, helicopters, and ships, as well as for telepresence applications.via: IEEE Spectrum A special kind of flight training In the CyberMotion Simulator, players can experience the quick and massive acceleration of driving a Ferrari. Credit: IEEE Spectrum. Engineers have turned a robotic arm into a “Ferrari simulator,” enabling users to feel what it’s like to experience high-speed driving while controlling the car in a video game. As shown in the video below, players sit in the robotic arm positioned about two meters off the ground, and the arm twists and turns to simulate the car’s motion. Citation: Robotic arm simulates driving a Ferrari (w/ Video) (2010, August 16) retrieved 18 August 2019 from https://phys.org/news/2010-08-robotic-arm-simulates-ferrari-video.html © 2010 PhysOrg.com 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. Explore furtherlast_img read more

  • Does the quantum wave function represent reality

    first_img Copyright 2012 Phys.Org All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com. Colbeck and Renner argue that, unlike a weather forecast, the wave function of a quantum system fully describes reality itself, not simply a physicist’s lack of knowledge of reality. In their paper, they logically show that a quantum system’s wave function is in one-to-one correspondence with its “elements of reality,” i.e., the variables describing the system’s behavior. The claim’s only assumptions are that measurement settings can be freely chosen and that quantum theory gives the correct statistical predictions, both of which are usually implicit in physics research, as well as experimentally falsifiable.“This [idea that the wave function represents reality] means that the wave function includes all information that is in principle available about the system, i.e., nothing is missing,” Renner told Phys.org. “Nevertheless, even if we knew the wave function of a system (and therefore reality), its future behavior cannot be predicted with certainty. This means that there is inherent randomness in nature.”The scientists’ claim relies on two seemingly opposite statements: First, any information contained in the system’s complete list of elements of reality (the list is complete if it contains all possible predictions about the outcome of an experiment performed on the system) is already contained in the system’s wave function. That is, the wave function includes all the elements of reality. The physicists formulated this statement in a paper last year. The second statement, which the physicists present here, is that a system’s list of elements of reality includes its wave function. Taken together, the two statements imply that a system’s wave function is in one-to-one correlation with its elements of reality. By showing that the wave function fully describes reality, the argument also implies that quantum mechanics is a complete theory.“Take again the analogy to a meteorologist’s work,” Renner said. “In this analogy, the data and models used by the meteorologist take the place of the wave function, and reality corresponds to the current weather. If there was a one-to-one correspondence between the meteorologist’s data and the weather, we would be in a very favorable situation: the forecast would then be as accurate as it can possibly be, in the sense that there does not exist any information that has not been accounted for.“Similarly, our result that there is a one-to-one correspondence between the wave function and the elements of reality means that, if we know a system’s wave function then we are exactly in such a favorable situation: any information that there exists in nature and which could be relevant for predicting the behavior of a quantum mechanical system is represented one-to-one by the wave function. In this sense, the wave function is an optimal description of reality.”This argument is not the only one made recently in favor of the wave function’s complete representation of reality. In November 2011, a team of physicists from the UK (Matthew F. Pusey, Jonathan Barrett, and Terry Rudolph) argued that the subjective interpretation of the wave function contradicts plausible assumptions in quantum mechanics, such as that multiple systems can be prepared in a way so that their elements of reality are uncorrelated. While this approach is completely different from that of the current paper, the support from both papers may help point to an answer to one of the most long-standing debates in physics. In the future, Colbeck and Renner plan to work on making the assumptions less stringent than they already are.“Our result is based on the assumption that an experimenter can, in principle, ‘freely’ choose which measurements he would like to carry out,” Renner said. “Hence, if one is ready to accept this assumption, our answer can be considered final. However, it is certainly legitimate to question this ‘free choice’ assumption (as well as the way ‘free choice’ is defined). We are currently working on a proof that the assumption can be replaced by a weaker one (which one might term ‘partial freedom of choice’).” As Colbeck and Renner explain in their paper published in Physical Review Letters, there are two prominent interpretations of the wave function dating back to its origins in the 1920s. In one view, the wave function corresponds to an element of reality that objectively exists whether or not an observer is measuring it. In an alternative view, the wave function does not represent reality but instead represents an observer’s subjective state of knowledge about some underlying reality. In 1927, Niels Bohr and others advocated this alternative view in the Copenhagen interpretation, in which the wave function is merely a mathematical probability that immediately assumes only one value when an observer measures the system, resulting in the wave function collapsing. Still others disagree with both views: in the ’30s, Einstein, Podolsky, and Rosen argued that the wave function does not provide a complete physical description of reality and suggested that the entire theory of quantum mechanics is incomplete.In their paper, Colbeck and Renner illustrate the difference between the two main views of the wave function’s probabilistic nature with a simple example:“Consider a meteorologist who gives a prediction about tomorrow’s weather (for example, that it will be sunny with probability 33% and cloudy with probability 67%),” they write. “We may assume that classical mechanics accurately describes the relevant processes, so that the weather depends deterministically on the initial conditions. The fact that the prediction is probabilistic then solely reflects a lack of knowledge on the part of the meteorologist on these conditions. In particular, the forecast is not an element of reality associated with the atmosphere but rather reflects the subjective knowledge of the forecaster; a second meteorologist with different knowledge may issue an alternative forecast. Moving to quantum mechanics, one may ask whether the wave function that we assign to a quantum system should be seen as a subjective object (analogous to the weather forecast) representing the knowledge an experimenter has about the system or whether the wave function is an element of reality of the system (analogous to the weather being sunny).” More information: Roger Colbeck and Renato Renner. “Is a System’s Wave Function in One-to-One Correspondence with Its Elements of Reality?” PRL 108, 150402 (2012). DOI: 10.1103/PhysRevLett.108.150402 Researchers conduct experimental implementation of quantum algorithm Explore furthercenter_img Two meteorologists predicting the chance of sunshine in a weather forecast. The meteorologist on the left has access to additional data (today’s weather, which is partly cloudy), and consequently the two make different forecasts. Unlike a weather forecast, the quantum mechanical wave function gives a complete description of a quantum system’s future behavior, and nature itself is inherently probabilistic at small scales. Image credit: Colbeck and Renner. ©2012 APS (Phys.org) — At the heart of quantum mechanics lies the wave function, a probability function used by physicists to understand the nanoscale world. Using the wave function, physicists can calculate a system’s future behavior, but only with a certain probability. This inherently probabilistic nature of quantum theory differs from the certainty with which scientists can describe the classical world, leading to a nearly century-long debate on how to interpret the wave function: does it representative objective reality or merely the subjective knowledge of an observer? In a new paper, physicists Roger Colbeck of the Perimeter Institute in Waterloo, Ontario, and Renato Renner who is based at ETH Zurich, Switzerland, have presented an argument strongly in favor of the objective reality of the wave function, which could lead to a better understanding of the fundamental meaning of quantum mechanics. Citation: Does the quantum wave function represent reality? (2012, April 25) retrieved 18 August 2019 from https://phys.org/news/2012-04-quantum-function-reality.html 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.last_img read more

  • Delhi gets a Nobel wall for Tagore

    first_imgThe Wall, which was jointly inaugurated by Swedish Ambassador Harald Sandberg and DMRC Managing Director Mangu Singh, will be on display Nov 9- 15 at the Rajiv Chowk Metro station.’This is a unique way to honour the Nobel laureates from India and give our youth an opportunity to know about such famous personalities, while they are on the move,’ said Mangu Singh.’It is a matter of pride for us to host the Nobel Memorial Wall with the Embassy of Sweden to honour Rabindranath Tagore. The contribution of his work has given India recognition all over the world,’ he added. Also Read – ‘Playing Jojo was emotionally exhausting’On the occasion, Sandberg said that this was a great initiative to commemorate the great minds that India has given to the world. The Nobel Memorial Wall will help the commuters to know about the life of such eminent personalities.’I believe metro stations are the best place to exhibit such things, as I have got to know that than fifteen lakh people use metro to commute daily,’ he added.The Nobel Memorial Wall will also be exhibited at the Huda City Center Metro station.last_img read more

  • Solitude and Serenity

    first_imgIt was the celebration of Solitude and Serenity in our lives, although a human is bound to the society he lives in, he has a side only to his own, the solitude where he finds serenity.Sumit Sehgal who is Butterfly and The Bee’s literati wizard started the evening along with Yaseen Anwer, founder of Poets Corner group by quoting that encouragement, dedication and zeal are the hallmarks that decides the success of a team, as a team.Art is a wandering form that has many stoppages and destinations, it never ends evolving. And, with times where everything is commercialised, Art is too, not left uninfluenced. Where writing is commercialised, the ardent need of quality literature endeavors and its recourse comes into being. Also Read – ‘Playing Jojo was emotionally exhausting’Poets Corner is a group of enthusiastic and prolific poets across the country and beyond, given chance to more than 120 new and previously unpublished poets from no less than 19 countries together for the cause of reviving poetry. The evening saw four book releases. Storm to Serenity by Vandana Arora was released by Poet Dolly Singh. The Bliss of Solitude by Farah Siddiqui was released by Poet Meenakshi Singh; Kindle the Spirit by Kamlesh Acharya was released by best-selling author and poet Sujata Parashar and Anthology: Confessions of a Heartan affair with Words was released by poets.last_img read more

  • Singing the memories of Pancham Da

    first_imgA musical evening dedicated to the memories of Late RD Burnam on his 75th birthday, hosted by PHD Chamber of Commerce, took over the Capital on 2 August. The show witnessed performances by renowned Bollywood singers like Vinod Rathore, Harshdeep Kaur, Babul Supriyo, Mamta Sharma and Hema Sardesai.The gala, held at  Talkatora Stadium, also honored the city’s finest media and entertainment personalities at the first edition of PHD Awards for the Excellence in Entertainment and Media on the basis of their proficiency.  Also Read – ‘Playing Jojo was emotionally exhausting’The Chairman of PHD Chamber of Commerce, Sharad Jaypuriya said, ‘This is the beginning of PHD Excellence Awards in this field, and every year, it would be given to the journalists and artistes selected by the Chamber’s committee.’ The Chairman of the Media and Entertainment Committee of the Chamber, Mukesh Gupta said, ‘We are very happy to host this event. At PHD Chamber of Commerce and Industry, we are just not an organisation of the business community of India, as we always strive to live by our chosen motto ‘In Community’s Life and Part of It’.  Also Read – Leslie doing new comedy special with NetflixGupta further noted, ‘This event is demonstratively an endeavour towards it, and to contribute significantly to the socio-economic development and capacity building in several fields in the country.’PHD Chamber of Commerce and Industry was established in 1905.It is a proactive and dynamic multi-State apex organisation working at the grass-root level and with strong national and international linkages.last_img read more

  • Onduty police official succumbs mystery shrouds death

    first_imgA 47-year-old senior sub-inspector (SSI), posted with the Noida police, died under mysterious circumstances on Wednesday night. Police said that the man was on duty when his condition was reported to be deteriorating. He was admitted to a private hospital, where he died after a few hours of treatment.The police have yet not accepted foul play but have sent the body for post-mortem, the report of which is awaited. Notably, the SSI had attended a function hours before his death. Also Read – Company director arrested for swindling Rs 345 croreAccording to the police, the one, Anil Sharma, who was on duty at the Sector 57 police post, had gone to a guest house in Sector 11, along with another policeman, where he complained of acute pain in his chest. He was admitted to the nearby Metro hospital, where he succumbed after a few hours. “As he was a cardiac patient, we suspect that he might have suffered an arrest. However, we are investigating the matter from other angles too. We have informed his family members also,” said a police official. The police informed that Sharma was a resident of the Baghpat district and had been transferred to Noida about a month ago.last_img read more

  • Alipurduar administration holds meet with 1500 tea garden workers

    first_imgKolkata: In a bid to disseminate information about the various development projects of the Mamata Banerjee government among the tea garden workers, the Alipurduar district administration on Sunday held a meeting with more than 1,500 such workers and their family members.”The meeting titled ‘Apnar Baagane Proshashon/Sarkar Baagan ke Duar’ (government at your tea garden), aimed at grievance redressal and awareness among the tea garden workers, is the brain child of Chief Minister Mamata Banerjee who held the administrative meeting at Alipurduar on July 11. She had advised us to take the administration closer to the public and to bridge the information and awareness deficit which was prevailing in the tribal and tea garden belts of the district,” said Nikhil Nirmal, District Magistrate, Alipurduar. Also Read – Rain batters Kolkata, cripples normal lifeIt may be mentioned that there are 60 tea gardens in Alipurduar district, among which 28 are stressed, including six closed gardens.”We will first hold these programmes at the stressed gardens and then do the same in the open ones,” Nirmal said.The meeting venue at one of the closed tea gardens in the district consisted of the entire administrative machinery of Alipurduar, comprising 16 line departments who set up stalls where flagship schemes of the government such as Kanyashree, Rupashree, Anandadhara, Mission Nirmal Bangla, Banglar Awas Yojana & Manabik Pension Schemes were advertised. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedBeneficiaries enrolled and grievances, if any, were addressed on the spot. Pamphlets and banners highlighting the schemes were put up in Hindi and Bengali language.In addition, a beneficiary distribution programme was held where SC/ST certificates, disability certificates, cycles, medicated mosquito nets etc. were distributed.As most of the tea garden workers are Adivasis who speak Sadri language, the DM even tried his hand at the language during his address and later spoke in Hindi which is very similar to Sadri.last_img read more

  • Feeling compelled to watch horror shows

    first_imgEver wondered what makes horror so popular or why does something strange or even repulsive still make us want to look? This could well be because there is an attraction to “oddities” outside of our everyday experience, says a study.For the research, Gary Vaughn, associate professor of English at the University of Cincinnati, looked into the underlying themes of the popular TV show, American Horror Story: Freak Show. He examined the show in terms of its danger and allure of “monsters” as well as what he calls the show’s “bait-and-switch appeal to its audience that starts out in voyeurism but ends in reflection.” Also Read – ‘Playing Jojo was emotionally exhausting’“While the plot landscape of ‘Freak Show’ may have more dead ends than a new sub-division and the blunt sexuality may make us squirm in horror more intellectual than psychological, these writing choices are, I believe, deliberate attempts to make us, the audience, confront our own stereotypes about difference and ‘disability,’” Vaughn said.Vaughn explained that the beginning of this television viewing experience is similar to that of audiences that used to pay to take a seat at the carnival side shows of the 19th century — shows that featured the bearded lady or two-headed animals.  Also Read – Leslie doing new comedy special with Netflix“As the series unfolds, we are forced to confront what we consider issues of freakishness,” Vaughn noted. “The ‘freaks’ in the series have their own sense of justice, their own sense of trust—sometimes misplaced— and their own ethics. In many instances, they demonstrate more admirable human qualities than the town’s so-called ordinary characters,” Vaughn explained.“‘Freak Show’ forces us to confront our own intellectual fears about difference, about diversity and about fears of change,” Vaughn noted. Our desire to look outside of our everyday experience could make such shows popular, Vaughn suggested. The study will be presented at the conference of the Midwest Popular Culture Association/Midwest American Culture Association which will take place in Cincinnati, US between Oct 1-4.last_img read more