(A) Male Eastern Bluebird (Sialia sialis, Turdidae). (B) Male Plum-throated Cotinga (Cotinga maynana, Cotingidae). (C) Channel-type beta-keratin and air nanostructure from back contour feather barbs of S. sialis. (D) Sphere-type beta-keratin and air nanostructure from back contour feather barbs of C. maynana. (E & F) Small-angle X-ray scattering data from the channel-type feather barb of S. sialis, and the sphere-type feather barb of C. maynana. Scale bars in (C, D) 500 nm, (E, F) 0.025 (1/nm) of spatial frequency. Photo credits: (A) Ken Thomas; (B) Thomas Valqui. Courtesy of Hui Cao Research Laboratory (PhysOrg.com) — Researchers at Yale University have succeeded in building a new kind of laser based on the way brightly colored birds show their colors. Building on the new approach to creating laser beams, whereby holes are drilled in a material in such a way as to trap light inside for a long enough period of time to create the laser light they are after, researchers Hui Cao, Heeso Noh and their colleagues describe in a paper they’ve published in Physical Review Letters, how they’ve emulated the way birds use air holes to display their colors. In traditional lasers, light is bounced back and forth (trapped) between mirrors with a so-called gain material between them that amplifies the light until it is of sufficient strength to pass through one end of the semi-transparent mirror, producing the beam. More recently however, optics researchers have found that another way to hold on to the light is to drill air holes in a material that causes the light to become trapped as it moves between the holes.The air holes in the material can be placed either in a clear ordered fashion, producing just one strong wavelength, or in random fashion which allows for multiple wavelengths but isn’t very efficient; something that grows in importance as the laser power desired grows and uses more energy when it is produced.The new technique falls somewhere in-between, in that at first glance the air holes appear to be random, but upon closer inspection, turn out to be ordered after all. This is where the brightly colored birds come in; nature has given them feathers with air pockets that at first glance appear to be randomly spaced, but under closer scrutiny it’s revealed that there is in fact, order underneath; the result is some light is trapped and bounced around inside and between them, allowing the amount of light to build up before ultimately escaping and giving the birds their brilliant hues.To recreate the effect in the lab, the research team drilled holes in a 190 nanometer slice of gallium arsenide, a particularly good plastic for lasers, 235 to 275 nanometers apart, and which also had a layer of quantum dots that shine brilliantly when struck with just one photon. As suspected, when the wafer was lit up, it produced a laser of about 1,000 nanometers, which made it far more efficient than random lasers; after more tests were made it was found that the wavelength produced could be changed by altering the amount of space between the holes.Though it’s not yet clear how the new type of laser will be used, it does seem likely the new approach will be used to help bring down the costs of lasers, and perhaps more importantly, the amount of energy needed to rum them. 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. Researchers create faster, more efficient laser for communications © 2010 PhysOrg.com Citation: New lasing technique inspired by brightly colored birds (2011, May 9) retrieved 18 August 2019 from https://phys.org/news/2011-05-lasing-technique-brightly-birds.html More information: — Control of Lasing in Biomimetic Structures with Short-Range Order, Phys. Rev. Lett. 106, 183901 (2011) DOI: 10.1103/PhysRevLett.106.183901AbstractWe demonstrate lasing in photonic amorphous structures that mimic the isotropic nanostructures which produce noniridescent color in nature. Our experimental and numerical studies reveal that lasing becomes most efficient at certain frequencies, due to enhanced optical confinement by short-range order. The optimal lasing frequency can be tuned by adjusting the structure factor. This work shows that lasing in nanostructures may be effectively improved and manipulated by short-range order.– www.eng.yale.edu/caolab/ Explore further
© 2010 PhysOrg.com Citation: Sony shows off two new unique Android tablets (2011, July 18) retrieved 18 August 2019 from https://phys.org/news/2011-07-sony-unique-android-tablets.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. Sony unveils two Android 3.0 Honeycomb tablets in iPad challenge (PhysOrg.com) — Sony has finally unveiled the S1 and S2; two uniquely shaped tablets, that it says, are for the more status minded buyer. Though both run the Android operating system, neither is shaped like the mostly etch-a-sketch designs currently on the market. The S1 has a folded back looking top that was designed to look and feel like a magazine that has been folded back. Company reps say that makes it more comfortable to hold in one hand. The S2 is a dual screen tablet embedded in a clam-shell case that can be opened and closed, making it look, as one observer at a recent press junket in New York described, like a sunglasses case. Explore further The S1 and S2 will be the first tablets introduced by Sony into the United States, and both appear to be aimed at users who are both looking for something different and have the money to pay for it.In addition to being more comfortable to hold, the added thickness at the top of the S1 means that when it’s laid on a table it tilts slightly towards the user, rather than at the ceiling, making it easier to read and type. Listed as a 9.4 inch tablet, the S1, which like the S2 will almost certainly be renamed before its official launch sometime in the fall, features both a USB and docking port.The S2, listed as a 5.5 inch tablet, actually provides a virtual 10 inch screen when the images on the two screens are used as one; it can be used either horizontally or vertically, which makes it ideal for reading eBooks in one direction and for use as a regular tablet in the other. Its big selling point is that it can be closed and put in a pocket, even if just barely.Both tablets are based on the NVIDIA Tegra 2 system on a chip (SoC) and have been, according to Sony, optimized to provide a faster user experience. Oddly, the S1 doesn’t have cellular connectivity, and thus the only means for getting online is via WiFi. The S2 on the hand can’t connect via WiFi; users will connect using only AT&T’s (in the U.S.) wireless services. Another draw for these two tablets is that both will have a PlayStation Certification, which means both will be able to run the PlayStation games that have been ported to an emulator on Android systems.Pricing for the two new tablets has yet to be announced.
(Phys.org) — The Institute of Electrical and Electronic Engineers (IEEE) is taking steps to come up with a new Ethernet standard capable of between 400Gbps and 1Tbps.The IEEE announced Tuesday it is forming a group focused on ringing wired Ethernet speeds up to where they will need to belong by 2015. Speeds which could peak at 1 Tbps. The announcement names the “IEEE 802.3 Industry Connections Higher Speed Ethernet Consensus Group” as the body now handed the mission to hammer out details of what will be the new standards for the next speed of Ethernet. The IEEE 802.3 Industry Connections Higher Speed Ethernet Consensus Group is to meet next month in Geneva from September 24 to September 25. While some observers refer to the problem as a traffic “swell,” numbers indicate it is more like a tsunami. Gregory Bell, Director, Energy Sciences Network (ESnet), and Director, Scientific Networking Division, Lawrence Berkeley National Laboratory, said that even the phrase ‘big data’ doesn’t describe the revolution occurring in many scientific disciplines. He said one only has to consider CERN’s recent announcement of a new particle, evidence that had to be sifted from gigabytes of data generated every second. He called CERN data just the tip of the iceberg.“Within three to six years we predict the need for a minimum of 400 Gbps connectivity to meet data mobility needs of experiments in fusion, astrophysics, genomics, climate research and other fields.”Similarly, the existence of the new group comes after findings that show the need to start working towards new standards now. The Consensus group launch has its roots in the IEEE’s assessments of 802.3 Ethernet Bandwidth, and seeing an exponential climb in global bandwidth requirements (802.3 refers to standards defining the physical l and data link layer’s media access control of wired Ethernet), with total traffic doubling every 18 months. In a July IEEE 802.3 Ethernet Working Group Communication, for example, it was said that “the bandwidth associated with core networking was observed, on average, to be doubling every eighteen months.” Although there was a wide variation in aggregated bandwidth needs, said the communication, “the observed trend that the doubling every eighteen months on average of bandwidth requirements associated with core networking is still a reasonable approximation. If the current trend continues, then this translates to an increase in traffic of a factor of 10 by 2015 compared to 2010 and by a factor of 100 by 2020.”The IEEE collected data is a reminder that the standards homework ahead is caused by far more than daily end users downloading movies or listening to music. The IEEE has been collecting data from data center networks, high-performance computing, financial markets, carrier and cable operators, Internet exchanges, and the scientific community.The most aggressive growth rates in network bandwidth consumption is happening in the financial sector and data-intensive science, the IEEE has found, with compounded annual growth rates of 95 percent and 70 percent, respectively.Potential participants to help decide on the new standards are likely to include users and producers of systems and components for carriers, Internet exchanges, financial markets, data centers, networking systems, high-performance computing, and network storage and servers. Explore further Citation: IEEE forms group to confront network traffic swells (2012, August 21) retrieved 18 August 2019 from https://phys.org/news/2012-08-ieee-group-network-traffic.html IEEE Ratifies 802.11n Wireless LAN Specification More information: © 2012 Phys.Org 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. Image: Wikipedia. www.ieee802.org/3/ad_hoc/bwa/BWA_Report.pdfwww.businesswire.com/news/home … -IEEE-802.3-Tm-Group
Citation: Air Force school looks to Locata GPS antenna technology (2013, September 25) retrieved 18 August 2019 from https://phys.org/news/2013-09-air-school-locata-gps-antenna.html (Phys.org) —The Air Force Institute of Technology, or AFIT, is the Air Force’s graduate school of engineering and management as well as its institution for technical professional continuing education. Earlier this month, AFIT and Locata, based in Canberra, Australia, announced an R&D deal to build and demonstrate new Locata multipath mitigation technology for use in GPS receivers. Locata, which also has an office in Las Vegas, has attracted interest within and beyond the Air Force for advancements made in global positioning system receivers. “This cooperation is expected to leverage many years of proprietary Locata ground-based technology development to bring completely new capabilities to satellite-based GPS receivers,” said the AFIT announcement. AFIT is looking to develop GPS-specific versions of Locata’s correlator and switching algorithms. Locata has attracted general interest in its VRay, an invention of Locata co-founder David Small. This is a type of antenna that can eliminate multipath interference. This says a lot for the frustrated many who have come to realize that GPS does not guarantee precision in urban areas. The VRay has been purposed for better performance in difficult environments.The VRay uses a beam-forming antenna with receiving elements that identify and subtract multipath and other interference to extract a clean signal. The antenna scans for beams and distinguishes what GPS signal is valid. The VRay has been designed for use on automated industrial and warehouse equipment, such as forklifts. but the antennas are under development for other form factors including smaller devices.GPS has presented some difficulties in places where tall buildings in urban areas interfere with signals. Those familiar with the problem cite multipath interference as the hurdle, as satellite signals reflect off buildings and confuse the positioning systems. That is where VRay is said to come in, serving areas where multipath has made it almost impossible for other RF-based positioning technologies to work.VRay technology delivers the needed accuracy and reliability in those instances. A New Scientist report on Locata’s technology quoted consultant David Last, former president of the UK’s Royal Institute of Navigation, assessing the value of Locata’s technology. “The concept of beam-steering for GPS is well known. However, its use has been mainly confined to the military due to the high cost. Locata’s breakthrough is to time-multiplex the receiver,” he said. The basketball-sized VRay prototypes are still bulky for some of newer applications in mind but designs under discussion include antennas that are flush with airframes and vehicle roofs, and a version built into helmets. Locata was incorporated in 1997 by David Small and Nunzio Gambale. Explore further More information: www.insidegnss.com/node/3724www.afit.edu/PA/news.cfm?article=588&a=newswww.locata.com/ Locata positioning hits ground at New Mexico missile range © 2013 Phys.org 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.
About 10.5 years long 15 GHz observations of the blazar J1043+2408 from OVRO. Credit: Bhatta, 2018. Using Owens Valley Radio Observatory (OVRO), astronomers have detected a periodic signal in the radio light curve of the blazar J1043+2408, which could be helpful in improving our understanding about the nature of blazars in general. The finding was presented in a paper published November 30 on arXiv.org. Explore further More information: Gopal Bhatta. Detection of periodic radio signal from the blazar J1043+2408. arXiv:1811.12689 [astro-ph.HE]. arxiv.org/abs/1811.12689 Rhythmic oscillations detected in the blazar Markarian 501 Citation: Periodic radio signal detected from the blazar J1043+2408 (2018, December 12) retrieved 18 August 2019 from https://phys.org/news/2018-12-periodic-radio-blazar-j10432408.html Blazars are a class of radio-loud active galactic nuclei (AGN). Their characteristic features are relativistic jets pointed almost exactly toward the Earth. In general, blazars, which are the most energetic sources in the universe, are perceived by astronomers as high-energy engines serving as natural laboratories to study particle acceleration, relativistic plasma processes, magnetic field dynamics and black hole physics. BL Lacertae objects (BL Lacs) are a type of blazar showcasing lower-power jets and higher Doppler factors than other blazars. J1043+2408 is one of the objects of this type, frequently observed by space telescopes and ground-based observatories.By monitoring such BL Lacs like J1043+2408 astronomers hope to find quasi-periodic oscillations (QPOs) in the multi-frequency light curves, including radio, optical, X-ray and gamma-ray. For instance, at radio frequencies, QPOs with periods ranging from few hours to few years have been recorded in a number of blazars. These periodic signals could provide essential insights into aspects of blazar studies, including disk-jet connection, magnetic field configuration and strong gravity near supermassive black holes.Now, in a new study, a group of astronomers led by Gopal Bhatta of Jagiellonian University in Kraków, Poland, reports finding a periodic radio signal in J1043+2408. The detection is the result of long-term observations of this blazar over more than 10 years, using OVRO’s 40-m telescope.”In this work, we report detection of a periodic signal in the radio light curve of the blazar J1043+2408 spanning ~10.5 years. We performed multiple methods of time series analysis, namely, epoch folding, Lomb-Scargle periodogram, and discrete auto-correlation function,” the researchers wrote in the paper.The observations revealed a repeating radio signal with a periodicity of about 563 days. The researchers noted that a signal with such periodic modulation could be explained by various scenarios, including binary supermassive black hole system, the so-called Lense-Thirring precession and jet precession.However, the authors of the study concluded that in the case of J1043+2408, gravitational perturbation in a binary supermassive black hole is the most plausible hypothesis.”We conclude that while other above-discussed scenarios can not be completely ruled out, periodic modulations induced by gravitational perturbation in binary SMBH [supermassive black hole] system seems a more plausible mechanism at the root of the observed periodic radio signal,” the paper reads.The astronomers added that studies of periodic oscillations in objects like J1043+2408 could be essential for advancing our knowledge about the processes in the innermost regions of blazars. Given that there are currently numerous scenarios explaining such modulations, further observations are required to help better determine the driving mechanisms of this activity. © 2018 Science X Network 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.
Amid the furore generated by Virat Kohli’s abusive behaviour with an Indian journalist, off-spinner Ravichandran Ashwin on Thursday tried to defuse the tension by lauding the fourth estate for its support and for “taking cricket back” to the country. Although Ashwin refrained from making any comments on the ‘Virat Kohli abuse episode’ but it did look like he tried his best in his damage control act.“Media is here to support us. It’s very heartening to see the media turn up in huge numbers and try to support us. But I mean, this is my take on it, media has a responsible way of taking cricket back home in a responsible fashion, taking cricket to the public in the way it needs to be taken,” Ashwin said answering a specific question on what’s his take on the media in general. Ashwin said at times he has not agreed with what has been reported but there have been times when media has been supportive. Also Read – Khel Ratna for Deepa and Bajrang, Arjuna for Jadeja“There are times when I’m not happy with that, but that’s my opinion. But there are other times when you support the players and it’s very important to take the game forward,” said Ashwin.Ashwin, however, refused to comment when asked pointedly about the Kohli incident in which the swashbuckling batsman hurled abuses at a reporter mistaking him for another scribe. “Honestly, I do not know what’s happened. It’s definitely not in my jurisdiction. I do not know what’s happened. I’m very honest about it,” said the offie.
Kolkata: Police arrested a middle-aged man from Kanksa in West Burdwan on charges of duping his colleagues by using their credit or debit cards without their knowledge.For the past few months, officials of a private healthcare unit noticed that money was getting deducted from their bank accounts. But initially it did not draw attention as they failed to realise it immediately after the money got deducted from their bank accounts. During investigation, police have found out that the arrested persons had opted a unique modus operandi while using debit cards of his colleagues for shopping and even didn’t get caught. He used to wait for the times when his colleagues left their wallets or mobile phones on the desk. Taking the opportunity of the situation, he used to take out the debit card from the wallet and keep away the mobile phone so that they do not get to see balance alert messages. He used to buy goods using the debit card and the mobile phone was needed to enter the one time password (OTP). He also used to delete the messages from the mobile phones. Later, he used to keep the mobile phones at such a place in the office itself that its actual owner used to think that he had kept there by mistake and used to carry on with his work without suspecting anyone. Police initiated a probe after two three employees found that their money got deducted from their bank accounts.While investigating into the cases, police have suspected that someone from the same workplace was behind the incidents and finally the middl-eaged man was arrested.
Kolkata: With the completion of seven years of the “Maa, Mati, Manush government”, Chief Minister Mamata Banerjee said that her government is committed to continue its work for the betterment of common people. Bengal has reached a new height in al-most all fields in the past seven years.It was on May 20 in 2011, when Banerjee had taken oath as Chief Minister in Raj Bhavan and walked up to Writers’ Buildings, amidst lakhs of people congratulating her for her success in ensuring a change of guard in the state. Her party had defeated Left Front, a party that was in power in the state for 34 long years and formed the government. Also Read – Heavy rain hits traffic, flightsSoon after forming the government, her landmark decisions took Bengal to new heights and ushered in global recognition for the state. On Sunday, Chief Minister Mamata Banerjee tweeted: “On May 20, 2011, the first Maa, Mati, Manush government took oath of office. It has been seven years and we continue to be committed to work for the betterment of people.”In the past seven years, the Chief Minister has introduced schemes that give coverage from the birth of a child to the death of a person. Mother of a new-born girl child is given saplings for free under the Sabujshree scheme. Again, Samabyathi scheme is to help people from financially weaker sections perform last rites of their near and dear ones. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedThere can be hardly any family in the state, members of which have not derived benefit of any of the schemes. Common people of Bengal have been immensely benefitted by the initiatives, including giving rice at Rs 2 per kg to more than 8 crore people under Khadyasathi project and free treatment in the state-run hospitals. Kanyashree, Sabujsathi, Gatidhara and Shikshashri are some of the iconic projects of the Mamata Banerjee government. Many such projects were later taken up by other governments. The Kanyashree Prakalpa, that ensured a check on the number of school dropouts and child marriages, took Bengal to the top of the world with the state bagging the first prize in United Nations Public Service Award for Asia Pacific in Netherlands. Besides ensuring an overall development of the state by constructing better roads, even in villages and organising global summits to attract investment in the state, the Mamata Banerjee government has settled age-old problems and restored peace in Darjeeling and the Maoist hit Junglemahal. Moreover, the Chief Minister’s constant vigil has also helped in averting any major law and order problem in the state, that has a tradition and heritage of peace and harmony. In the Assembly election in 2016, it was the overall development carried out by the Mamata Banerjee government in the past five years, which once again brought her a landslide victory, following which she once again plunged into development work. She once again held administrative review meetings in all the districts, as a measure that helped in timely completion of development work. Moreover, the Centre has repeatedly appreciated the work of the Bengal government, by awarding it for its achievements in different fields, starting from ease of doing business to agriculture. Recently, Bengal has once again topped in the country, with Digambarpur Gram Panchayat (GP) in South 24-Parganas bagging the Centre’s award of best GP in India. Bengal government has also won Krishi Karman award for five consecutive years.With equal importance given for development in the urban and rural parts of the state, beautification work carried out in the City of Joy has been appreciated by people from across the globe. Several toilets were also constructed in Bengal, where 21,324 villages were declared Open Defecation Free (ODF). The number is the highest in the country and Nadia is the first ODF district in India.With the state witnessing marked development in the past seven years, people have extended their support to Banerjee and her party in the recently held Panchayat polls as well, which will help in easy execution of projects and implementation of schemes in the grassroot level.
Bringing a world of artificial intelligence and robots from the canvas of cinema, a three-day Artificial Intelligence Film Festival will be held here from September 17.The festival, being held in collaboration with Cinedarbaar, will show six science-fiction films that bring stories of robots and technology which will be followed by interactive sessions and robotic workshops at the American Center Auditorium (US Embassy) here, read a statement. The Day The Earth Stood Still, which stars Michael Rennie, Patricia Neal and Hugh Marlowe, will open the festival with its intriguing storyline about the alien landing and how the people of Earth fight for survival. Also Read – ‘Playing Jojo was emotionally exhausting’The closing film will be Chappie, featuring Sharlto Copley, Dev Patel and Hugh Jackman. With a futuristic setting, the film takes cinema-goers to
Kolkata: The state Assembly on Tuesday made an all-party resolution accusing the BJP government at the Centre of divisive politics over the National Register of Citizens (NRC) in Assam, that has excluded the names of more than 40 lakh people in the final draft.Trinamool Congress, Congress and CPI-M unanimously slammed the Centre for turning so many people into ‘refugees in their own homeland’.It may be mentioned that the motion for a discussion on the issue was placed by state Parliamentary Affairs minister Partha Chatterjee and Speaker Biman Banerjee allowed it, taking into account the seriousness and sensitivity. Also Read – Rain batters Kolkata, cripples normal lifeUrging all the Opposition parties to raise their voice in unison, state Panchayat minister Subrata Mukherjee took the attack to Prime Minister Narendra Modi, for his indifference regarding the whole episode.Partha Chatterjee said: “They (BJP) are trying to use the Supreme Court verdict as a shield and the NRC as a mechanism to drive the Muslims and the Bengalis out of Assam. We are sending a team to Assam and if needed our Chief Minister will also go. Many people including the intellectuals are calling me. Everyone is worried”. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killed”Difference in political opinions will always remain in democracy. But that does not mean that you can push so many people towards anuncertain future for the sake of politics. The Prime Minister has assumed the position of Nirab (Silent) Modi. It is unprecedented and we strongly condemn the act,” Mukherjee said.Minister of state for Health Chandrima Bhattacharya questioned the modus of the NRC and said that the Supreme Court has not provided any such guideline on the basis of which the NRC has excluded the names of so many Assam citizens, the majority of them being Bengalis. “The NRC in December 2017 had the names of these citizens and now in the latest NRC draft their names have been omitted. It is clearly a tactic to segregate and isolate those people who do not belong to BJP’s votebank,” she said.She lashed out at the Centre for shifting the onus upon the deprived population to prove that they are residents of the state.”Most of them had cast their votes in 2014 and 2016. A good number of them have been residents there for 105 years and now they have to prove their identity. Why?” Bhattacharya questioned and alleged that the Centre has illegally not brought NRC under Right to Information Act.Trinamool Congress leader Tapas Roy termed the episode as the greatest crisis in the country post independence.CPI-M leader Sujan Chakraborty alleged that it is an attempt to create unrest in the whole country. “This act is against the culture and tradition of the state of Bengal and has opened up a Pandora’s box where all states will feel the NRC Assam effect in the days to come, if the voice of dissent is not raised,” Chakraborty said.Leader of Opposition in the Assembly Abdul Mannan also strongly condemned the issue and appealed to all Opposition parties to bring the state intellectuals under an apolitical umbrella and take the protest to the Centre.