The researchers, Dominique Brosteaux, Fabrice Axisa, Eva De Leersnyder, Frederick Bossuyt, Mario Gonzalez, and Jan Vanfleteren, of the Interuniversity Microelectronics Centre and Ghent University in Belgium, have recently designed and fabricated elastic interconnections that can stretch to more than twice their original lengths (a 100% stretchability). Their results are published in a recent issue of IEEE Electron Device Letters. Researchers ‘stretch’ the ability of 2-D materials to change technology “For biomedical and textile applications, the comfort of the user will be enhanced if the electronic circuits are not only flexible, but also elastic,” the researchers explained in their study. “Biomedical applications include implantable devices and electronics on skin.”In the paper, the scientists describe how they constructed 3-cm-long elastic connectors by embedding 4-micrometer-thick gold wires in a highly elastic silicone film. The wires were coated with a 2-micrometer-thick nickel layer for soldering wires to the ends. “Besides this construction, our team has also been developing alternative versions of this technology based on the same molded interconnect device (MID) technology,” Vanfleteren told PhysOrg.com. MID can combine electrical and mechanical functions on a single unit, replacing the conventional circuit board.The group patterned the gold wires onto a substrate in a “horseshoe”-shaped form, which significantly reduced the stress compared with an elliptical shape, while maintaining the initial electric resistance. The horseshoe shapes were then connected to create a wave-like pattern. To further increase the elasticity, the researchers found that splitting the wire conductor track into four thinner (15-micrometer-wide) tracks greatly minimized the induced stress.The researchers then tested a variety of different shaped connectors by stretching them to the point of electrical failure, which is caused by a rupture in the metallic track. The best connector stretched from 3 to 6 centimeters without losing conductance. However, all interconnections—even those that experienced electrical failure—recovered their conductance when they returned to their normal length. A goal of the SWEET project is to design electronics that are not only elastic, but also washable, as demonstrated by this water-resistant, stretchable LED circuit. Credit: Jan Vanfleteren, et al. (TFCG Microsystems Lab-Ghent University). Explore further This stretchable thermometer can wrap around a patient’s forehead like a headband thanks to the horseshoe-shaped metal wires, which can stretch up to twice their normal lengths. Credit: Jan Vanfleteren, et al. (TFCG Microsystems Lab-Ghent University). Currently the group is developing technology toward the incorporation of the elastic interconnections into full electronic circuits. This goal is being pursued by three projects: BioFlex (Biocompatible Flexible Electronic Circuits) with funding by the Institute for the Promotion of Innovation by Science and Technology in Flanders; STELLA (Stretchable Electronics for Large Area Applications) with funding by the European Commission; and SWEET (Stretchable and Washable Electronics for Embedding in Textiles) with funding by the Belgian Science Policy. “At the moment we’re focusing on the following applications: implantable electronics, smart textiles (with integrated stretchable circuits), and smart band aids (e.g. measuring physiological parameters that should follow skin deformations),” Vanfleteren said, adding that further details remain confidential at this time.The latest developments of the group on stretchable circuits can be found on their Web page:tfcg.elis.ugent.be/projects/stretchable.htmlCitation: Brosteaux, Dominique, Axisa, Fabrice, Gonzalez, Mario, Vanfleteren, Jan. “Design and Fabrication of Elastic Interconnections for Stretchable Electronic Circuits.” IEEE Electron Device Letters, Vol. 28, No. 7, July 2007.Copyright 2007 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. Citation: Elastic circuit connectors designed for rubber-band-like circuits (2007, July 10) retrieved 18 August 2019 from https://phys.org/news/2007-07-elastic-circuit-connectors-rubber-band-like-circuits.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. Researchers from Belgium have devised a plan for making headway into the area of flexible, washable electronics. These integrated electronics, which could be incorporated into clothing and biomedical applications, require all connections between components to stretch like rubber bands while maintaining their conductivity.
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. Copyright 2010 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. Explore further Modeling this idea isn’t too hard, Sarkar says. “Various physicists have constructed models for a new particle that would acquire the same excess of particles over anti-particles as baryons have.” Sarkar and Frandsen point out that gravity would affect these dark baryons, and that they would even interact with each other, although not very strongly, thus influencing the formation of galaxies. In order to test the idea of dark baryons, Sarkar and Frandsen suggest an experiment using the sun.“There is a simple point made 15 years ago, that dark matter will be captured when it comes close to the sun, just like ordinary matter. If these particles exist, then they will inevitably fall into the sun, and begin orbiting inside it, thus transporting heat outward, through their occasional collisions,” Sarkar says.He goes on to explain that, because we know a great deal about the sun, it is possible to work out how much heat should be transferred out, and calculate the change in the flux of solar neutrinos, particles that are very sensitive to the core temperature. “If dark matter particles are asymmetric, they can build up in the sun to higher levels since they aren’t annihilating, and we could see a measurable reduction in the flux of solar neutrinos.”Sarkar says that it should be possible to test this relatively soon. “There are already experiments looking for dark matter – however, they are looking for much higher masses. If detectors could be redesigned to be sensitive to lower masses, then they will find it soon. Another way is to measure solar neutrino fluxes with high accuracy to determine if dark matter has slightly cooled the solar core.”Sarkar admits that so far, this is just a theory. “We don’t know what dark matter is, but scientists would very much like to find out, since it has profound implications for the nature and origin of the universe.”“This is an idea we’re putting out there, to say it is a possibility. It predicts signals to look for, and provides an explanation for some puzzling features of the sun. We hope that experimenters will check this out, even if only to prove us wrong.” Citation: Could dark baryons explain dark matter? (2010, July 20) retrieved 18 August 2019 from https://phys.org/news/2010-07-dark-baryons.html Sarkar is a Professor at the University of Oxford in England. Along with Mads Frandsen, he has been working to show that asymmetric “dark baryons” can be a candidate for cold dark matter. This is a different approach, since dark matter is assumed to be heavy ‘supersymmetric’ particles that are very weakly interacting. Sarkar and Frandsen suggest though that dark matter could be much lighter, asymmetric (i.e. just particles and no antiparticles) and interact more strongly. Their work is published in Physical Review Letters: “Asymmetric Dark Matter and the sun.”“We have known for some time that most of the matter in the universe is not the (baryonic) matter that we are are made of. However, we know, from various measurements that dark matter is what holds different structures together through gravity,” Sarkar says. “We don’t know what it is, but we know it is out there.”For years, it has been thought that dark matter particles must be relatively heavy, and that they do not interact at all with other dark matter particles and only very weakly with ordinary matter. Thus the origin of dark matter is totally unrelated to that of baryons, which is in itself a mystery. If there had been equal amounts of (baryonic) matter and antimatter in the early universe, everything should have annihilated. “Clearly the universe is not empty so there must have been some matter-antimatter destruction, but there is an excess of matter that has survived,” Sarkar points out.“So there must have been an initial excess of matter over antimatter”. If baryon asymmetry makes it possible for matter to exist in the universe, could it be the same for dark matter? “If there is a new “dark baryon” which is five times as heavy as a baryon and has the same relic asymmetry, then dark matter would contribute five times as much as ordinary matter in the universe, as is indeed observed,” Sarkar explains. He adds that this was first proposed by the physicist David B Kaplan. (PhysOrg.com) — “The prevailing belief about dark matter particles is that they should be about 100 or more times heavier than protons,” Subir Sarkar tells PhysOrg.com. “However, we were thinking about the possibility of lighter particles that can constitute dark matter, which may be more easily detectable with current experiments.” Sun’s dark matter trap More information: Mads T. Frandsen and Subir Sarkar, “Asymmetric Dark Matter and the Sun,” Physical Review Letters (2010). Available online: link.aps.org/doi/10.1103/PhysRevLett.105.011301
My daughter hates studying. She’s in class 5 and we are getting very worried. Please help!Renuka Singh, New DelhiRenuka, I think most kids dislike the association with books. With age, some realize the importance of education and naturally start getting attentive. I strongly recommend that you politely discuss the power of studies. You should also try to help her understand her hobbies, her creative elements. May be she will make a successful alternative career someday. Whatever happens, don’t get stressed. Support her and help her understand her strength. Good luck! Also Read – ‘Playing Jojo was emotionally exhausting’I’m 46. I fear that my sex life will be completely disrupted after menopause! What to do?Name withheld, GujaratIt’s very common for women going through menopause to experience a decrease in libido and sex drive. Because a woman stops ovulating once she’s experienced menopause, she loses that extra hormone boost that results in arousal. But, at the same time, some women enjoy their sex life post menopause. No fear of unwanted pregnancy act as a peace factor and they get much closer to their partner than ever before. A lot is in the mind and for ages women have enjoyed their sexual life irrespective of their pauses! Also Read – Leslie doing new comedy special with NetflixI’m in love with a Muslim girl. We are Brahmins and they are not accepting this relation. We can’t live without each other. What should be done?Gourav S, HaryanaJust do what you want to do! Assuming you both are adults, I suggest, have a very open conversation with both families. Give them some time to absorb the facts and see how it turns out to be. If the attitude doesn’t change, work out the logistics and head for the ultimate decision of togetherness. Just be sure that you both weigh the situation before any final plunge. I’ve just returned from Bangalore where I did my Engineering. After I returned, I feel very alone here. I feel completely out of place.Dinesh, New DelhiProbably the place you left has left a permanent impression on your mind. Or may be the independence of staying alone, the freedom of being your own guardian gave you peace. Try to engage yourself in some work that will occupy your mind. Check out for a couple of months and if you still feel uneasy, you can relocate back to Bangalore or any other place of your choice! One life, don’t compromise on small things. Cheer up!Have a love or life query you cannot find an answer to? Send your questions to – [email protected]
After all the ‘streetilicious’ delights from Connaught Place and around, we bring you you our picks from Delhi’s very authentic ‘desi’ fast-food joints in Kamla Nagar. Kamla Nagar or K-Nags -arguably the most popular ‘hang out’ destination for Delhi’s Gen-Y and the DU (Delhi University) crowd K-Nags boasts of numerous legendary indigenous fast-food joints, ideal for a snack-on-the-go or a leisurely Sunday brunch with family and friends. Moving away from the staple of momo joints and chinjabi fare in the area and the host of Delhi University canteens, we bring you some grear authentic picks that are best enjoyes on an easy chilled-out day in the Capital. Read on… Also Read – ‘Playing Jojo was emotionally exhausting’OM DI HATTI Since 1956, a small non- descript shop named Om di Hatti at the Shakti Nagar ‘chowk’ is serving mouth-watering Chhole Bhature (priced at a very reasonable Rs 40). Presently run by the founders’ 4thgeneration, Om di Hatti also offers piping hot samosas and chhole-chawal. BOMBAY BHEL HOUSENext, a few meters down and turning right towards the Chhota Gol Chakkar, into the Kamla Nagar market area, you come across Bombay Bhel House, established in 1975, a heaven of healthy, refreshingly light Gujrati snacks. Here you can take your pick from traditional Gujju snacks like Dhokla, Khandvi, Bhel-puri, Khakra, Thepla, etc and a wide range of namkeens. Also Read – Leslie doing new comedy special with NetflixSHARMA KACHORI WAALEJust a few shops away from Om Di Hatti you will find one of the best and easily the cheapest kachori in Delhi. Established in 1941 Sharma KachoriWale offers a serving of 5 small crispy kachoris with spicy aalo-subzi ata ridiculous Rs 16. The taste and flavours are amazing and far better than the exorbitantly priced kachoris found in branded eateries across the city. BILLE DI HATTI This is true landmark of Kamla Nagar, famous across generations, since 1952, for its lip-smackingly delicious Punjabi Poori-Chhole (Rs 45 for a plate of 2 puris) and very rich and buttery Sweet Lassi (Rs 45). Bille di Hatti is where you can regularly see even the most devoted morning-walker and diet conscious succumb to the ultimate Punjabi combination of Poori-Chhole. VAISHNAV CHAAT BHANDHAR For those who prefer the more ‘chat-pata’ variety of traditional ‘desi’ snacks, Vaishnav Chaat Bhandhar, near Bungalow Road offers the ultimate mouth-watering options in Gol Gappas, Papri Chaat, Aaloo Chaat, Dahi Bhallas and Paneer Tikka at reasonable prices in the range of Rs 40 to Rs 70.NEERAJ CORNER Every day, for more than half a century, Neeraj Corner near the Barha Gol Chakkar, has been dishing out hundreds of glasses of its famous chilled lemonade (lemon-soda) to quench the thirst of millions in Delhi’s killing summer. For the less enlightened, Neeraj Corner also offers other more common beverages and on a chilly in wintery day, one could order a piping hot espresso.
The number of dengue cases in Delhi and its adjoining areas has climbed to 75. The figures from the civic bodies, 64 cases of dengue have been reported from the national capital. The 11 other cases have been reported from the adjoining areas in Uttar Pradesh and Haryana till 20 September.
Aakriti Art Gallery presents an exhibition of drawings by artist Ramkumar titled -Drawings from the 60’s. Ramkumar, a legendary artist is regarded as one of the first-generation of post-independence artists in India. His contemporaries included artists likes of M.F Husain, F.N Souza, SH Raza and Akbar Padamsee. As an artist, he evolved from his short lived figurative phase into a master of abstractions. The show is curated by poet and art-critic Prayag Shukla, a close associate of Ramkumar for five decades Also Read – ‘Playing Jojo was emotionally exhausting’‘The sense of quiet that pervades his work invites contemplation, not a gaze’ said Sham Lal on Ramkumar. Ramkumar trained under Andre Lhote and Fernand Legar in Paris.The 20th century modernism in Paris, Vienna and London served as an inspiration for him, combined with a desire to ethnically belong to the homeland- in its inherent Indianness. Ramkumar’s search for an Indian identity has transcended mere motifs and figurative. As an artist he evolved from his short lived figurative phase into a master of abstractions. Having renounced the active engagement with the state and civil society that had earlier characterized his position, the artist had turned gradually inward, choosing to be in an internal exile of the spirit. His drawings to be exhibited mark a transcendence into abstraction. The drawings reflect sheer beauty through lines creating an experience rather than a discourse. Drawings presented in the show are sensitive charting of momentous happenings, in fine lines, and speak volumes for Ramkumar’s delicate rendering quality. Where: Aakriti Art Gallery, Lado Sarai When : On till 29 November
Kolkata: In a unique initiative, National Ayurveda Students and Youth Association (NASYA) in collaboration with Vishwa Ayurveda Parishad (VAP) – WB, National Pharmaceutical Consultancy Service (NPCI)–WB and Independent Research Ethics Society is organising “Herbal Treasure Hunt”, a seven-day long competition where ayurvedic doctors and students have to capture selfies with minimum 55 herbs and plants and then send them with their local names, Also Read – Heavy rain hits traffic, flightsLatin names and medicinal usage as a part of an awareness campaign.NASYA and VAP members are eligible to take part in the programme. There will be six prizes, which will be distributed among the participants, who will be able to capture maximum number of selfies with the plants. Dr Sumit Sur, state president of the NASYA said almost all the plants have some medicinal values. The main purpose of the event is to make the people aware about the plants and herbs and their usage. This programme will help increase knowledge of Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedevery individual.The competition will start from 7 May and last till 13 May, during which the candidates will have to capture the selfies. The competition will be conducted across the country starting from Monday. The candidate who will be able to capture maximum number of selfies with the plants and correctly send their names will be awarded the first prize.Independent Research Ethics Society (IRES) has conceptualized the competition to enable the young and dynamic Ayurvedic doctors to identify medicinal plants. Dr Pawan Kumar Sharma, president of IRES said: “We hope that the programme will be a huge success. This will help the students to acquire knowledge about the plants and trees.”
In a bizarre mix-up, Swedish police raided an apartment after a couple hung 21-shaped balloons to celebrate a birthday but it was mistaken for ‘IS’ in a reverse image from outside and considered as Islamic State propaganda.Sarah Ericsson hung up the balloons in the shape of the number ‘21’ for her birthday which resulted in her home in Karlskrona, Sweden, being visited by Swedish police who thought it stood for ‘IS’ and had been put up by supporters of the Islamic State extremist group. “It was a little strange,” the 21-year-old told The Local from the library at Blekinge Institute of Technology in southern Sweden, where she is taking a course in Spatial Planning. Also Read – Pro-Govt supporters rally as Hong Kong’s divisions deepenThe student was already in class on Monday when her boyfriend Fabian Akesson, who was staying at her home received a visit from police.A passerby had called them after looking through the window at the two balloons pushed together to make the number ‘21’ and confusing their reverse image with the letters ‘IS’, which the extremist group also known as the Islamic State often uses as part of its propaganda.“We understand why someone would report it if they thought it looked like IS-propaganda, although everyone else just thought it looked like the number ‘12’ from outside,” Ericsson said. Also Read – Pak Army ‘fully prepared’ to face any challenge: Army spokesmanHer boyfriend Akesson explained that he was looking out of a window brushing his teeth when he noticed several police cars outside the house and then heard a knock on the door.When he went to open it, he was greeted by three police officers, who quickly realised that they had made a mistake.“I laughed about it and they showed me a photo that they had taken where from their perspective, it did almost look like the letters IS,” he told Swedish newspaper Kvallsposten.But despite police accepting the error, Akesson said he was still asked to remove the balloons from the window.