HighTemp Superconducting Nanowire System is First of its Kind

first_imgAn array of YBCO nanowires with 20-nanometer diameters. Image courtesy of James Heath. Citation: High-Temp Superconducting Nanowire System is First of its Kind (2008, November 26) retrieved 18 August 2019 from https://phys.org/news/2008-11-high-temp-superconducting-nanowire-kind.html Researchers around the world have been working to create superconducting nanowires, but few studies have investigated the feasibility of nanowires made of high-critical-temperature (high-Tc) superconducting materials and, prior to this work, no such nanowires had been produced.”We did not know whether high-Tc superconductivity could be maintained for very long, thin nanowires or whether their behavior would follow traditional superconductor models,” said CalTech chemist James Heath, the paper’s corresponding author, to PhysOrg.com.He added, “High-Tc materials as nanostructures are also notoriously difficult to fabricate because their crystal structure and other properties must be maintained, and this is not easy to do.”High-Tc materials are often more desirable than traditional superconductors because they function at temperatures “warmer” than the boiling point of liquid nitrogen, or 77 degrees Kelvin (about -321 degrees Fahrenheit). While still ultra-cold by everyday standards, these temperatures are easier to achieve in the laboratory because liquid nitrogen, which is commercially available and relatively easy to work with, can be used to cool them. This makes high-Tc materials more suitable for many applications.Despite the roadblocks, Heath and colleague Ke Xu created high-Tc nanowires using a widely known high-Tc material, a copper-oxide compound known as YBCO. The nanowires were fabricated from YBCO strips into arrays of up to 400 nanowires each, lined up in parallel. Metal contacts run across the wires perpendicularly so that their electrical properties could be measured.The wires are as narrow as 10 nanometers and as long as 200 micrometers (millionths of a meter). The critical temperature, the temperature below which a material superconducts, varies with the wires’ dimensions. For example, while all the wires exhibit a superconducting transition above liquid-nitrogen temperature, the temperature width of the transition broadens as the nanowires’ widths decrease. For example, the 10 and 15 nanometer wide wires become fully superconducting 20 K and 10 K, respectively.Because of this increased transition width, Heath and Xu’s high-Tc nanowires exhibit both superconducting and normal resistive behavior over a wide temperature range—greater than 50 K. This feature could be useful in nanowire-based superconducting quantum-interference devices, or SQUIDs, in which resistance oscillations caused by quantum interference between two wires is used to measure extremely small magnetic fields.In future work, Heath and Xu are designing nanomaterials to potentially increase the “critical current” of the high-Tc nanowire systems—the point at which the current is too high to pass through the material with no resistance.Citation: Nano Lett., 2008, 8 (11), pp 3845–3849Copyright 2008 PhysOrg.com. 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. 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) — Scientists from the California Institute of Technology have, for the first time, created an array of nanowires that are superconducting at relatively high temperatures. This work, published recently in Nano Letters, could lead to the incorporation of superconducting nanowires into emerging nanotechnologies.last_img read more

Photoshopped Images Could Carry Warnings in France

first_img The law has been proposed by Valerie Boyer, a member of parliament in France, because of concerns that airbrushed or “photoshopped” images can distort how people, especially young people, see themselves. Boyer is an advocate for awareness of body image problems such as obesity and anorexia, and worries that the preponderance of enhanced images in magazines encourages people to believe in a non-existent reality. Boyer believes the disclaimers could help young people realize that touched-up images distort reality. She said that many adolescents, especially young girls, have difficulty distinguishing between what is real and what is not, and they can develop body image problems and unrealistic expectations, that can sometimes lead to anorexia and other serious health problems.Boyer, a member of French President Nicolas Sarkozy’s UMP party, is backed by fifty other politicians, who are also concerned about protecting consumers, especially young people. Boyer said the group wants to fight the stereotype of women all being young and slim. The move follows a charter agreed to voluntarily by the fashion industry in France to avoid promoting extreme thinness.If the proposal becomes law French advertisers could be fined up to half the cost of their advertising campaign, or over $54,000 (US), if they do not include the statement. The law is currently being debated in the French parliament.© 2009 PhysOrg.com (PhysOrg.com) — A law has been proposed in France that would see digitally enhanced images carry a warning to viewers that the image has been retouched to change the physical appearance of a person. The proposed statement may eventually apply to political campaigns, billboards, photos on packaging, art photos, and press photographs as well as advertisements in magazines and newspapers. Citation: Photoshopped Images Could Carry Warnings in France (2009, September 28) retrieved 18 August 2019 from https://phys.org/news/2009-09-photoshopped-images-france.html Image: by casillar, photobucket. 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. High hopes turn poker machine players into problem gamblerslast_img read more

Black Hat presentation shows irisscanning breach

first_img Explore further An iris code is the data stored by recognition systems when they scan a person’s eye. This is information that the researchers could replicate in their synthetic images.A commercial iris system only looks for the iris code and not an actual eye, Galbally noted. He and his team tested their fake irises against a leading commercial-recognition system. In 80 percent of attempts, the scanner believed that the attempt was a real eye. The findings of their tests were shared at the annual Black Hat security conference that took place July 21 to July 26in Las Vegas. “A binary iris code is a very compact representation of an iris image, and, for a long time, it has been assumed that it did not contain enough information to allow the reconstruction of the original iris,” said the Black Hat conference note. The team’s approach was described as a probabilistic approach to reconstruct iris images from binary templates, and they also sought to analyze to what extent the reconstructed samples were similar to the original ones While a human expert would not be easily deceived by them, “there is a high chance that they can break into an iris recognition system,” it was noted.Further commenting at the Black Hat event, assistant professor Galbally, of the Biometric Recognition Group-of ATVS, said “The idea is to generate the iris image, and once you have the image you can actually print it and show it to the recognition system, and it will say okay,” determining that the image is the real person. To carry out the exploit, a hacker would need to access the database that holds the iris scans, stored as templates or digital records of an individual’s biometric features. Upon access to the templates, the hackers could use a genetic algorithm to alter the synthetic code over several iterations until a nearly identical template was produced. Creating the match would be as simple as printing it out and showing it to the recognition system. This in turn could be achieved by patching the image onto a contact lens to be worn by the attacker. One may argue that an exploit of this nature is not likely “but the vulnerability is there,” he said, and it is always useful for awareness that such vulnerabilities exist. Galbally is actively involved in European projects focused on vulnerability assessments of biometricsThe significance of the findings presented at Black Hat is that this is evidence of an identity-stealing technique where the fake image can be generated from the iris code of a real person. Past work in iris scanning vulnerabilities centered on creating synthetic iris images that had characteristics of real iris images but were not connected to real people. QUT researcher eyes off a biometric future Citation: Black Hat presentation shows iris-scanning breach (2012, July 27) retrieved 18 August 2019 from https://phys.org/news/2012-07-black-hat-iris-scanning-breach.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. (Phys.org) — A research team from Universidad Autonoma de Madrid and West Virginia University have troubling findings for those who think iris scanning is one of the safest methods of biometric security. Their reverse-engineered, “replicated eye” image was able to bypass iris scanning, fooled into thinking the synthetic image was real and correct. Javier Galbally and his team printed out synthetic images of irises taken from codes of real irises stored in security databases to test iris-scanning vulnerabilities. © 2012 Phys.orglast_img read more

Research trio finds bluebird mothers give sons extra dose of androgen when

first_img Journal information: Science (Phys.org)—A trio of researchers has found that western bluebird mothers add a little extra androgen to clutches of eggs during times when there is competition for nest cavities. In their paper published in the journal Science, University of Arizona biologists Renée Duckworth, Virginia Belloni and Samantha Anderson describe how they conducted a ten year field study of the bird species and also carried out some experiments to learn more about induced maternal effects on the cycle of species replacement. Ben Dantzer, with the University of Michigan, offers a Perspectives piece on the work by the team in the same journal edition. When forest fires happen in western parts of the U.S. many trees are killed but do not get burned away, providing an opportunity for insects. Woodpeckers then move into such areas to eat them and wind up creating nest cavities in the trees, which they eventually abandon. That leaves the nest cavities available for other birds to use. Quite often, mountain bluebirds move in first, because they are early migrants. But then, western bluebirds arrive and bully their way into the nest cavities, replacing the more docile species. Once established, though, less aggressive members of the western group eventually become the norm. Duckworth el at wanted to know what was the mechanism that allowed the western bluebirds to take over, so they set up a field study.After watching the birds for many years, the team began to suspect that in areas where there was antagonism between birds of the same species, the mothers began adding more androgen to their eggs—which would of course make them both more aggressive and likely to venture into new territory, such as where recent burns had occurred. In addition to testing eggs for androgen levels, the researchers modified some of the natural habitats by making more or fewer nest cavities available for the birds after a fire. They found that as the competition for such cavities increased, androgen levels in eggs rose, confirming their suspicions. The researchers are not, of course, suggesting that the bird mothers make a conscious decision to add more androgen—instead, it likely happens automatically as a reaction to certain types of stress.In an interview on Science’s weekly podcast, Duckworth noted such reactions are not restricted to birds, prior studies have shown that humans, for example, while in utero can be impacted due to environmental conditions in ways that have long term effects—thus, learning more about the process could very well lead to learning more about ourselves. Explore further First in non-primates: Research shows jackdaws use eyes for communication © 2015 Phys.orgcenter_img More information: Cycles of species replacement emerge from locally induced maternal effects on offspring behavior in a passerine bird, Science 20 February 2015: Vol. 347 no. 6224 pp. 875-877. DOI: 10.1126/science.1260154ABSTRACTAn important question in ecology is how mechanistic processes occurring among individuals drive large-scale patterns of community formation and change. Here we show that in two species of bluebirds, cycles of replacement of one by the other emerge as an indirect consequence of maternal influence on offspring behavior in response to local resource availability. Sampling across broad temporal and spatial scales, we found that western bluebirds, the more competitive species, bias the birth order of offspring by sex in a way that influences offspring aggression and dispersal, setting the stage for rapid increases in population density that ultimately result in the replacement of their sister species. Our results provide insight into how predictable community dynamics can occur despite the contingency of local behavioral interactions. Citation: Research trio finds bluebird mothers give sons extra dose of androgen when antagonized (2015, February 20) retrieved 18 August 2019 from https://phys.org/news/2015-02-trio-bluebird-mothers-sons-extra.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. This is an Eastern bluebird (Sialia sialis). Credit: Kitty Konolast_img read more

Being more colorful found to be disadvantage for female plover

first_img Recreational fishing poses threat to shore-nesting birds More information: The bright incubate at night: sexual dichromatism and adaptive incubation division in an open-nesting shorebird, Proceedings of the Royal Society B, rspb.royalsocietypublishing.or … .1098/rspb.2014.3026AbstractOrnamentation of parents poses a high risk for offspring because it reduces cryptic nest defence. Over a century ago, Wallace proposed that sexual dichromatism enhances crypsis of open-nesting females although subsequent studies found that dichromatism per se is not necessarily adaptive. We tested whether reduced female ornamentation in a sexually dichromatic species reduces the risk of clutch depredation and leads to adaptive parental roles in the redcapped plover Charadrius ruficapillus, a species with biparental incubation. Males had significantly brighter and redder head coloration than females. During daytime, when visually foraging predators are active, colour-matched model males incurred a higher risk of clutch depredation than females, whereas at night there was no difference in depredation risk between sexes. In turn, red-capped plovers maintained a strongly diurnal/nocturnal division of parental care during incubation with males attending the nest largely at night when visual predators were inactive and females incubating during the day. We found support for Wallace’s conclusion that reduced female ornamentation provides a selective advantage when reproductive success is threatened by visually foraging predators. We conclude that predators may alter their prey’s parental care patterns and therefore may affect parental cooperation during care. Citation: Being more colorful found to be disadvantage for female plover (2015, April 8) retrieved 18 August 2019 from https://phys.org/news/2015-04-disadvantage-female-plover.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. (Phys.org)—A team of researchers working in Australia has found that bright coloring on female birds appears to be a reproductive disadvantage. In their paper published in Proceedings of the Royal Society B, the team describes how they tested predation of red-capped plover eggs and discovered that enhanced coloring by the parent tending the nest, made the eggs a more likely target, at least during the day. © 2015 Phys.orgcenter_img Red-capped Plover (Charadrius ruficapillus), Orford, Tasmania, Australia. Female in breeding plumage. Credit: JJ Harrison/Wikipedia Journal information: Proceedings of the Royal Society B Explore further In many bird species, males sport bright colors and sometimes long feathers, as part of attracting a female. Meanwhile, females of the same species tend to be much more sedate in coloring. Red-capped plovers are one such example, the red cap on the head of males is bright red, while on the female its light brown. The researchers wondered if the female coloring was subdued due to reasons other than it simply being unnecessary. To find out, they set up a test environment consisting of models of plovers sitting next to a clutch of eggs—they used pheasant eggs instead of plovers—they look the same. They then taped ravens as they swooped down and grabbed some of the eggs. They varied the models, sometimes using red capping to mimic males, other times brown to mimic females. They also conducted their study when it was dark out, when it is foxes that are after the eggs. Plover parents take turns sitting on the nest—the females take the day shift while the males are on at night.In analyzing the video, the researchers discovered that ravens were far more likely to grab some eggs during daylight hours if a male with its red cap was guarding the eggs (80 percent of those on display were taken by ravens) versus the females (only 20 percent the eggs were taken)—at night, the red markings made no difference because foxes find eggs using their nose—the predators ran off with 80 percent of those set out.The researchers claim their findings indicate that the female birds have clearly evolved in ways that make them less noticeable to predators, and thus their eggs are more difficult to find than if they had coloring similar to their male mates.last_img read more

Eat up Santa or Soak up the sun

first_imgSpending Christmas in Delhi and no plans yet? Fret not, because some of the five-stars have thought way ahead of us and made plans for us already. Tuck out of bed late and head to The Claridges New Delhi for a special Christmas Day brunch in the garden. On offer are European, Indian and Chinese spread with unlimited premium beverages and a live band on top of that (Rs 3,495 + taxes). Soak the sun while the children engage themselves in pottery, face painting or tattoo making. Also Read – ‘Playing Jojo was emotionally exhausting’Or celebrate the Yuletide spirit with a special Christmas dinner at The One at Le Meridien. Spread out will be an elaborate buffet with roasted turkey, Christmas pudding, seafood and a glass of complimentary red or white wine — and all of this comes for Rs 3,500.Children will be Santa’s Pals at Le Meridien as they party. There are games, hair-braiding sessions, carol singing, workshop on Origami and clay modelling. The theme is Reduce-Reuse and recycle and to keep with the theme, the Xmas tree has been made using old newspapers. Also Read – Leslie doing new comedy special with NetflixThe connoisseur is spoilt for choice when it comes to confectionery items.  At The Claridges’ Ye Old Bakery, you can pick up delectable Christmas goodies like ginger bread house, chocolate Santa Claus, Yule log, chocolates besides the traditional butter ball turkey and attractive gift hampers.Le Meridien’s Caffe e Chocolart has good news for your sweet tooth. They are baking  a special selection of goodies that include plum cakes, stollen, chocolate Yule Log, Sacher gateaux, cookies, handmade chocolates, ginger huts and small chocolate Santas.   If you want to spend the day away from the mundane home, book yourself at The Claridges with your partner. Their special stay offer includes pick up and drop in a luxury sedan, lavish dining under lilac-draped canopies at their garden, a personal butler in attendance, music and Christmas Day Brunch. All for a neat Rs 49,995.So what are you waiting for? Take your pick now.last_img read more

Sexual exploitation in office is nothing new

first_imgMy husband has a lot of female friends. He’s very friendly with them and keeps chatting till late night! If I get irritated and complain, he says I’m over reacting. How do I handle this?Aarti, MeerutI understand that this is irritating. You can try to verbally sort this with him. Explain how it affects you. Do tell him that though you trust him completely, too many woman in his life makes you feel a bit uncomfortable, may be you can show your possessiveness towards him! If he still continues, you can try his way. Start interacting with your friends/guy friends or get active on a cyber social network. Pay no attention to him and ignore him completely. Just stop telling him anything and behave as if nothing he does affects you anymore. Sometimes, ignorance is bliss and he might rectify his actions soon. Also Read – ‘Playing Jojo was emotionally exhausting’My best friend is seeing a guy from a different religion. I don’t approve of this relationship. I feel the guy isn’t good for her but she’s adamant!Preeti, New DelhiWe never understand when others explain. So I feel that your friend will not pay attention to your words till and she feels it herself. I’m sure you have your reasons for disapproval. As a friend do express your feelings to her but don’t expect her to dump the guy based on your opinion. Don’t get too involved. I’m sure in today’s time all of us have our share of problems. Be happy with your life and don’t let external issues burn you. Also Read – Leslie doing new comedy special with NetflixI have met a girl on Facebook. She chats with me everyday and lives in a different city. I’m in love with her. I feel she loves me too. How should I take the relationship forward?Neerav, GhaziabadDon’t trust the cyber world blindly. There are too many people waiting to crush your imagination. I suggest take it slow. Before you make any decision, do meet this girl and she should meet you too. Love is a wonderful feeling, but sometimes a complicated game. Don’t get obsessed. Time is the biggest test and with time you’ll be able to handle this in a more mature manner. Commit only when you have met in person and spent quality time together. My boss wants to sleep with me. He’s married and I don’t find him attractive. But, my refusal will lead to problems! Please help.Unknown, New DelhiSeduction or sexual exploitation in office isn’t anything new. If you feel you want to avoid his advances, please talk to him and explain that you don’t have any such feelings towards him. You can also point, that you are in a relationship and certainly cannot accept such things. If this leads to any problem, look for a new job. Complaining to HR might help, but may lead to unnecessary gossip at the workplace. Do what you feel is right.My wife is very scared of anal sex. I love it but can’t convince her.Mr. Sharma, LudhianaMany men enjoy anal sex, but convincing your wife to have anal sex may be a challenge. Talk it out. Find out exactly what makes her hesitant to try it and then see what you can do to belie her fears. Many women only try anal sex once and then swear it off for life. This is usually because their first attempt was painful. The anus is nerve-packed and with the right kind of stimulation anal play can feel amazing. Unfortunately, the same cluster of nerves responsible for the pleasure can also transmit feelings of pain if your technique is wrong. Perfect the setting. She needs to be relaxed and prepared; anal sex is not suited for a quickie. Getting her aroused is of the utmost importance.Have a love or life query you cannot find an answer to? Send your questions to – roopshashotm@gmail.comlast_img read more

Lights Camera action

first_imgThe theme of the stall is Delhi as a Film Shooting Destination, where Delhi Tourism is highlighting its facilities available for film-makers intending to shoot in Delhi, as well as introducing its designated – Film Shooting Facilitation Cell – made for this very purpose.The Film shooting Facilitation Cell showcases the entire progression of how the film shoots are done in Delhi. It also portrays various nuances of film-making to the visitors in the stall. Also Read – ‘Playing Jojo was emotionally exhausting’One of the actors present in the stall, Kanisha Malhotra said, ‘There is a film shooting set which is created here in the stall with professional actors enacting various scenes live. We also invite willing participants from the visitors so they can get a feel of enacting in a movie themselves. The shows usually lasts for an hour or two but we keep it minimum during the rush hours.’Delhi Tourism has also produced a Film Shooting Manual for Film Shooting in Delhi, which is also available in the stall at Delhi Pavilion.last_img read more

Oscar fever

first_imgAssociation and Cinedarbaar is organizing The Oscar Fever from 28 February – 1 March , screening five selected movies nominated for the Oscars 2014 at the American Center Auditorium.The Oscars, one of the prestigious movie awards give honour to exemplary works in the movie industry. As part of the celebratory event, American Center is showcasing 2013 movies which are nominated for the Oscars this time. The festival will open with Saving Mr. Banks  Also Read – ‘Playing Jojo was emotionally exhausting’and Gravity on 28 February at 3:00 pm and 6:00 pm respectively. The last day will witness three movies Frozen, The Croods and Captain Phillips at 1:00 pm, 3:30 pm and 6:00 pm in chronological order.Saving Mr. Banks and Captain Phillips are biography dramas whereas Frozen and The Croods are animated adventure comedies. Also in store is an entertaining Sci-Fi drama thriller Gravity.  It will be an enriching experience for all the movie lovers to watch the Oscar nominated movies during the time when the much awaited results will be announced. Also Read – Leslie doing new comedy special with NetflixWatch all the movies this weekend and become the best judge to select your favourite in various categories. These five movies will not only be a source of fun and entertainment but also serve as a medium of knowledge and information to the masses.The entry to the festival is free and is on first come first serve basis. Please carry a valid photo ID to enter the American Center.WHEN: 28 Feb to 1 MarchWHERE: American Centre Auditorium (Basement Level), KG Marglast_img read more

CBI books BoM official 14 others in fraud case

first_imgCBI has registered case against former Assistant General Manager of Bank of Maharashtra (BoM) posted in Maharashtra beside 14 others for causing an alleged loss of Rs. 42.38 crores (approx) to the bank. Recently, BoM Aurangabad Zone, has lodged a complaint with the CBI against the former Assistant General Manager A.M. Raje and 14 persons including proprietors, partners of a local private firms for causing the loss.It was alleged that then Assistant General Manager during the period 2012-2013 had entered into criminal conspiracy with other accused persons and sanctioned credit facilities amounting to Rs.5 Crores (approx) each to the borrowers under the Loan Against Property Scheme of BoM by taking on record false valuation reports of the mortgaged property wherein their values were highly inflated by the Panel valuers. “The borrowers miss utilized the funds and did not repay the funds. An alleged loss of Rs.42.38 Crores (approx) was caused to the BoM,” CBI statement reads.last_img read more