New superconductive properties discovered in old sandwich material

first_img Explore further © 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. (PhysOrg.com) — Japanese researchers, led by Masashi Kawasaki, have discovered that a previously known kind of double layered material created using electrostatic doping can be used as a superconductor. The team, working out of Tohoku University, found that by creating a double layered material using an ionic liquid atop a platform of potassium tantalum oxide (KTaO3) with deposited electrodes, a superconductive state could be made to exist by cooling the result to near absolute zero. They have published their results in Nature Nanotechnology.The authors are quick to point out that they have not created a new superconductive material, but have instead figured out a way to make a known material become superconductive by means of electrostatic doping (using electrostatic properties to control the conductivity of a material). They contrast this with more traditional methods that use chemical doping (adding chemical impurities to a substance to allow for controlling the amount of current that passes through it) which they say means a material might be found that would allow for superconductivity at room temperatures; the holy grail, or course, for many researchers for many years.The first part of the process, which had already been established, works by adding a drop of ionic liquid onto a set of electrodes that have been placed on a base of KTaO3. Doing so causes a double layer to form between the materials with a gap between them of approximately 2nm. When electricity is sent to the electrodes, the charge adheres electrostatically to either side of the gap, creating a sort of capacitor. The next part is new; this is where the team subjected the result to lowered temperatures, measuring the conductivity across the gap as they went. They found that as things got colder the conductivity changed; first, from that of an insulator, then to that of a metal, then to a semiconductor and finally, to that of a superconductor, at around 0.005K, very close to absolute zero.If the research team is successful in a finding another material that would provide the same results at room temperature they would set the stage for a whole new generation of electronic circuits that would be able to operate with very little power and produce little to no heat; options that would likely open the door to new and exciting types of computers and other types of electronic devices. More information: Discovery of superconductivity in KTaO3 by electrostatic carrier doping, Nature Nanotechnology (2011) doi:10.1038/nnano.2011.78Superconductivity at interfaces has been investigated since the first demonstration of electric-field-tunable superconductivity in ultrathin films in 19601. So far, research on interface superconductivity has focused on materials that are known to be superconductors in bulk. Here, we show that electrostatic carrier doping can induce superconductivity in KTaO3, a material in which superconductivity has not been observed before. Taking advantage of the large capacitance of the self-organized electric double layer that forms at the interface between an ionic liquid and KTaO3, we achieve a charge carrier density that is an order of magnitude larger than the density that can be achieved with conventional chemical doping. Superconductivity emerges in KTaO3 at 50 mK for two-dimensional carrier densities in the range 2.3 × 1014 to 3.7 × 1014 cm−2. The present result clearly shows that electrostatic carrier doping can lead to new states of matter at nanoscale interfaces. New property in warm superconductors discovered Image: Nature Nanotechnology (2011) doi:10.1038/nnano.2011.78. For more details, please see the original paper. Citation: New superconductive properties discovered in old sandwich material (2011, May 23) retrieved 18 August 2019 from https://phys.org/news/2011-05-superconductive-properties-sandwich-material.htmllast_img read more

AMDs Trinity is out to rattle Intels Ivy Bridge

first_imgA BBC report on the Trinity launch carries comments from AMD’s CTO, Joe Macri, who talked about Trinity’s Piledriver architecture of the CPU cores. He referred to Piledriver’s energy-saving technique, which is “resonant clock mesh technology,” where some of the energy consumed while doing calculations is recycled. Further, power savings have been achieved, says AMD, by running more processes on the GPU. The power is dynamically shifted between the CPU and GPU depending on application needs.Trinity is using AMD Radeon HD 7000 Series graphics for an increase of graphics performance up to 56 percent over the previous generation, claims AMD. Trinity offers HD, 1080p resolution gaming, delivering 30 frames per second. Similarly, the industry standard for smooth gaming is 30 frames per second. While graphics performance features are a marketable strength for gamers, AMD could also benefit from a class of business computer users whose work could use higher-end graphics capabilities, as for high-definition video discussions and trader applications, where multi-screen support and high-speed rendering are important.AnandTech, in assessing Trinity’s performance, found that, while AMD had a tough job of increasing performance without ballooning die size, the die size went up only by around 7percent and yet AMD achieved “double-digit increases” over Llano in CPU and GPU performance. “If you liked Llano, you’ll love Trinity,” said the report. According to AMD, Trinity has up to 12 hours of battery life, whereas Llano offered 10.5. Once products appear that carry Trinity processors, the real numbers will either comply or will need some adjustments. Besides HP, according to reports, Asus, Lenovo, Samsung, Toshiba, and Acer may announce mobile devices based around Trinity shortly. The battery-life calculations that were announced by AMD are based on the average power on multiple benchmarks and usage scenarios, said the company. Twelve hours of battery life are based on Windows Idle (740 min./12:20 hours) as a resting metric.Technology strengths in Trinity center on having fine-tuned power management. 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. © 2012 Phys.Org Explore further More information: Press release AMD Fusion APUs plumped, primped, stretched (Phys.org) — AMD has announced Trinity, its second-generation A-Series accelerated processing units (APUs), which are out to rival Intel’s Ivy Bridge processors. AMD’s Trinity is an update to its Llano, which attempted to challenge Intel’s Sandy Bridge. Trinity includes up to four CPU cores ad single GPU, with features especially suited for supporting laptops and ultra thin notebooks. The Trinity chips will appear on HP’s Sleekbook machines when the Sleekbook debuts next month. With Trinity, AMD is promoting its two appealing strong suits that sit well with manufacturers and consumers, in the name of graphics performance and power consumption. Citation: AMD’s Trinity is out to rattle Intel’s Ivy Bridge (2012, May 15) retrieved 18 August 2019 from https://phys.org/news/2012-05-amd-trinity-rattle-intel-ivy.htmllast_img read more

Industrial design students create solar bag that purifies water while person walks

first_imgThe two say that their Solar Bag can purify two and a half gallons of water in six hours, the same amount of time it typically takes other systems to treat much less water. Unfortunately, the bags aren’t yet being commercially produced; the two are currently looking for a backer. They say that the material costs for one Solar Bag amount to just $5, and possibly less if manufactured in bulk. (Phys.org) — It’s common knowledge that a lot of people in the world don’t have access to clean drinking water. In some parts of Africa, people, particularly children fall victim to bacteria in the water they drink; a lot of them die. For some, getting to a water source, even one that isn’t clean can mean walking for several miles, and then carrying it back. It’s for these people that industrial design students Ryan Lynch and Marcus Triest have designed and created what they call the Solar Bag, it’s a bag that holds water and hangs off the shoulders and lies on a person’s back and uses UV radiation from the sun to kill bacteria in the water while the person is walking or after they have arrived at their destination. To create their bag, they turned to a method of water purification known as SODIS, where PET (made of polyethylene terephthalate – the type of plastic used for soft drinks) bottles filled with water are exposed to sunlight for up to six hours, allowing UV radiation to kill most of the bacteria in it. Instead of bottles they created a two sided bag. On the outer side, the one that faces the sun when a person walks, is clear plastic that allows the UV rays to enter. On the inner side is black plastic that absorbs heat, helping the UV rays do their job. The bag is then connected to straps that allow the water to be carried like books in a common backpack. The bag can be hung on a wall as well, for continued treatment after the person carrying it arrives at their destination. It also has a tap at the bottom to let the water out and a squeeze balloon with filter for additional purification. © 2012 Phys.org 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.center_img Using UV rays to kill bacteria in water is nothing new, there are many gadgets that do so, though many require electricity to help the process and virtually all of them are centered around treating the water once it has arrived. Lynch and Triest saw that as inefficient and cruel. Why make seriously thirsty people sit around for hours waiting for their water to become safe to drink when the process could have been started right after filling the container that was brought back? More information: www.byrye.com/solar-bag.html New gadget for water purification: a ‘nano tea bag’ Citation: Industrial design students create solar bag that purifies water while person walks (2012, August 2) retrieved 18 August 2019 from https://phys.org/news/2012-08-industrial-students-solar-bag-purifies.htmllast_img read more

Model shows ejection of gasses around black holes due to magnetism

first_img Explore further An international team of researchers has created a model to explain the force that causes gases to be blown away from a black hole and have found the force to be magnetism. In their paper published in the journal Nature Astronomy, the team describes the factors that went into their model and the degree of confidence they have in it. A black hole devouring a star. Credit: NASA Journal information: Nature Astronomy Hubble gazes into a black hole of puzzling lightness Citation: Model shows ejection of gasses around black holes due to magnetism (2017, March 7) retrieved 18 August 2019 from https://phys.org/news/2017-03-ejection-gasses-black-holes-due.htmlcenter_img © 2017 Phys.org Scientists have suspected that magnetic fields were responsible for pushing gases away from a black hole since the 1970s, but there was not a consensus—others suggested it might have been due to the heat of the gas. In this new effort, the researchers built on a prior model that had found magnetism to be the force pushing gas away from a giant black hole—this time, they based their model on small black holes and found the same result. This, the team suggests, means that it is likely the case for all black holes.The gases in question come from a companion star—the black hole strips the star’s gas and as it does so, creates a spiral with an accretion disk. As the spiral turns, an electric current is generated in the accretion disk, which forms a vortex pulling in more and more matter. But, the model showed, some of the magnetism serves to push gas from the outer edges of the spiral out into space, where it escapes and can be observed by X-ray telescopes on Earth.The model also ruled out heat from the gas as the cause for its expulsion—if it were heat, the model showed, the gas would have been blown much farther than readings have shown. The researchers suggest the magnetic fields likely arc from pole to pole, though there is still no way to prove it. They note also that the expulsion of gas from around the black hole could be powerful enough in some situations to actually push out all of the gas, leaving the galaxy it inhabits empty and unable to form new stars. Such galaxies have been observed as simple blank red areas in space. More information: Keigo Fukumura et al. Magnetic origin of black hole winds across the mass scale, Nature Astronomy (2017). DOI: 10.1038/s41550-017-0062 (arxiv.org/abs/1702.02197) 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

Earthy music resonant voice

first_imgCoke Studio celebrated Khan and his band of musicians set the evening on fire with sufi magic rendered in true Rajasthani folk style. The nomadic tribe of entertainers from Rajasthan Josh spun a web of magic by rendering the ageless sufi numbers Aaj Rang Hai He Maa Rang Hai Ree, Dama Dum Mast Kalandar to name a few. To the accompaniment of dhol, tabla, harmonium, manjira and castanets, ace musical maestro Khan’s rich and powerful voice soared high in the tradition of the Manganiyar musicians. The Manganiyar musicians have wandered since time immemorial across the deserts of Rajasthan, regaling royalty as well as the commoner with stories of Rajput valour and devotional Sufi songs, celebrating life and festivals. Khan and his band brought alive the flavour of Rajasthan with their earthy music and resonant voices. The desert and its hypnotic sounds held the audience in complete thrall and swept up the enraptured listeners into a magical realm. The magic of the evening was further enhanced by the grace of the gypsy dancer who kept up with the rhythmic sounds with her moves in rich and colourful gypsy attire. The audience swayed in tune to the music and the beats.last_img read more

Panchayat violence intellectuals criticise TMC admn police

first_imgKolkata: A section of intellectuals today castigated the ruling Trinamool Congress, the administration and the police, claiming that they have remained “silent spectators” while widespread violence is taking place in West Bengal during filing of nominations for next month’s panchayat elections in the state. Former state advocate general Bimal Chatterjee said unleashing of violence to ensure a walkover in the panchayat elections is nothing but incapacitation of democracy. Also Read – Heavy rain hits traffic, flights”Villagers are being subjected to violence and harassment. The leadership of the ruling party, the administration and the police are silent spectators,” social activist Miratun Nahar said at a press conference called by the intellectuals from various fields to protest incidents of attacks on opposition candidates and supporters.Stating that several of these intellectuals had stood up against violence against the people of Nandigram during the anti-land acquisition movement in 2007 against the then Left Front government in the state, theatre personality Bivas Chakraborty claimed that they are apolitical and have protested against any undemocratic activity. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedHe expressed apprehension as to what will happen during the three-phase elections in the first week of May, if so much violence is perpetrated during the nomination process.”It is very painful when those whom we had supported act like those who they have replaced and resort to undemocratic means to win elections,” said singer Pratul Mukhopadhyay.He said domination is ultimately not good for those who are perpetrating such acts, and these acts are more harmful for the perpetrators than those they are trying to dominate.”Ensuring a walkover by those in power in the state by preventing the opposition from filing nomination is not good.It amounts to incapacitation of democracy,” Chatterjee, who had been appointed advocate general by the present dispensation in the state and had resigned later, said.last_img read more

Panic in Kolkata Metro

first_imgKolkata: There was panic among commuters following repeated sparks and sudden darkness inside a Kolkata Metro Railway rake here on Sunday night. There were, however, no injuries.Many passengers got out of the train by breaking the window glasses in a desperate bid to ensure their safety near the Netaji station in the Kudhat area.The Kavi Subhas station bound train from Dum Dum developed the snag while approaching Naetaji station and came to a halt. Also Read – Heavy rain hits traffic, flights”As the lights suddenly went out there was a big commotion inside the train. Many children traveling in the train for terrified and started crying. There was an announcement in the public address system asking the passengers to get out of the train quickly,” said a passenger.”There were sparks earlier also during the journey. We raised an alarm, but nobody listened to us. After the train gales Aa here, the doors did not open. After waiting for five minutes, we finally broke open the glass windows and came out,” said another passenger. The train services were disrupted after the incident.Metro Railway sources said the problem arose due a power failure.last_img read more

Siliguri train mows down 2 jumbos forest dept to lodge FIR against

first_imgDarjeeling: The Forest department will be lodging an FIR against the motorman of the Intercity Express train that mowed two elephants (mother and cub) in the Jalpaiguri district on Friday morning.The incident occurred at around 7:45 am in between Redbank Tea Estate and Debpara Tea Estate near Railway Pillar 875 and Banarhaat when a herd of elephants were crossing the tracks. The train runs between Siliguri Junction and Alipurduar.While the mother and the calf died on the spot, the rest of the herd moved into Dyna forest. “We have been constantly coordinating with the railways regarding elephant movement throughout the State. In the past, we have requested the railways to ensure that motormans exercise caution while driving through elephant corridors. It seems they have turned a deaf ear,” retorted Binay Krishna Burman, Forest Minister, Government of West Bengal.This year, four elephants have been mowed down by speeding trains (including these two elephants) in North Bengal.Since the conversion of the Jalpaiguri-Alipurduar railways track to broad gauge from meter gauge in 2004, 70 elephants have been killed.Ujjal Ghosh, Chief Conservator of Forest (Wildlife), Northern Circle: “The area in which the elephants were mowed down is an established elephant corridor.On Thursday, we had informed the Railways of elephant movement in the area and even intimated them of the location. The elephants were mowed down 500 meters away from the area we had earmarked. Ironically, the accident happened in broad daylight. We will lodge an FIR against the engine motorman.”The railways have constituted an enquiry committee. “The committee after conducting a thorough enquiry will submit its report,” stated Chandravir Raman, Divisional Railway Manager (DRM), Alipurduar.He, however, stated that the motorman of the train had applied emergency brakes when the elephants appeared on the tracks suddenly.”There is speed restriction of 30 km per hour from 5 pm to 5 am. As the accident occurred after 5 am, there was no speed restriction in the region at the time of the accident,” added Raman.Forest employees complain that the train was at a high speed at the time of the incident.last_img read more

8 dead in 2 separate road accidents in Hooghly

first_imgKolkata: As many as eight persons were killed and 11 others injured in two separate road accidents that took place in Hooghly district on Friday night.The first mishap occurred on Assam Link Road near Dumurdaha bus stand when a speeding vehicle mowed down 11 persons who were taking part in a procession arranged for the immersion of idols. The vehicle overturned soon after it hit them. Out of the total 11 persons, five were declared brought dead after being rushed to a Chinsurah Imambara Hospital. Six others are undergoing treatment at a local hospital some of whom had suffered critical injuries. Also Read – Rain batters Kolkata, cripples normal lifeThe deceased have been identified as Manoranjan Bachar, Kartik Malik, Chiranjit Mondal, Bimal Roy and Seikh Khoka. According to the police, a local club took out its Durga idol immersion procession along the Assam Link Road in Hooghly when a speeding car hit them. The driver of the vehicle applied emergency brakes but failed to stop the vehicle. The locals rushed the injured persons to the hospital. After being informed, the cops reached the spot and started an investigation. The officers are probing if the driver was in a drunken state at the time of the accident. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedAnother accident took place near Sahagunge area of Bandel on GT Road in the same district on Friday night when a speeding truck hit two Toto rickshaws. Three persons including the driver of the Toto were killed and five others injured. The truck driver fled the spot immediately after the accident while the helper was beaten up by the irate mob. He was later rescued by the police. The local residents staged protests. Police officers resorted to mild lathi charge to disperse the mob. The injured persons were taken to a local hospital. Police said the speeding truck was going towards Bandel from Hooghly when the accident took place near Katwa Gate. Police are conducting raids to nab the truck driver who had been at large since the incident occurred.last_img read more

SHGs to launch ecofriendly pens made from paper

first_imgKolkata: Various schemes taken up by the Panchayat and Rural Development department have not only helped the Self-Help groups to become economically independent but also in conserving the environment.Subrata Mukherjee, state minister for Panchayat and Rural Development department will release eco-friendly pens at a function on Monday. The unique eco-friendly paper made pens have been manufactured by some women associated with a Self-Help group at Para in Purulia district. It may be mentioned that the state Panchayat and Rural Development department has earned appreciation from the Centre for running Self-Help groups and implementing 100 days work programme excellently in the rural areas. Also Read – Rain batters Kolkata, cripples normal lifeThe ball point pens will be priced anything between Rs 5 and Rs 15. They contain a plastic refill while the bodies are made of coloured papers with a beautiful look. The paper has been processed so that it can be carried like ordinary plastic-made ball point pens. The use of plastic in the pens is minimum as the state government is slowly trying to do away with the use of plastic. “Each pen contains seeds of Palas or Simul trees so that after using the pens one can sow the seeds and help in aforestation. The women associated with the Self-Help groups are doing excellent jobs and many of them are coming up with new ideas that are excellent,” said a senior official. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedIt may be mentioned that the fly ash made bricks manufactured by some women run Self-Help groups have become quite popular. The Panchayat and Rural Development department has opened eight brick kilns so far and the brick kilns are eco-friendly. All these Self-Help groups have become economically self-reliant. In Nadia, some women have become economically independent by doing pisci culture. The Panchayat and Rural Development department has dug up the water bodies and the state Fisheries department has given up the necessary training.last_img read more