SelfHealing Sunlight Helps Scratches on Cars Electronics and Furniture Disappear

first_img 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) — There are few things in life that are more annoying than having your iPod’s beautiful face marred by scratches. But what if those scratches could “heal” themselves? New technology developed at the University of Southern Mississippi could lead to just that situation. And it would work on more than just your handheld music device: Scratches on furniture and cars could disappear as well. It isn’t magic, though. In order to protect your merchandise from scratches, it would be necessary to coat them with a special polyurethane treatment. The coating is clear, and its special properties are derived from chitosan. Chitosan is the material that makes the exoskeletons of such creatures as crustaceans and insects hard. The chitosan is combined with oxetane. Oxetane is ring-shaped — and unstable. This becomes important for the healing of scratches. When something scratches the coating, the oxetane ring is broken. The reactive ends of the broken rings are eager to re-bond to something. The ultraviolet rays of the sun act as an activation mechanism for the chitosan. The chitosan binds the molecule fragments together, closing the ring again and helping the scratch to “heal”. The scratch appears to have disappeared, leaving the surface smooth once more. The process takes about half an hour in natural sunlight.This new advance is significant because creating non-living coatings that can repair themselves is tricky work. From expandable gel to nanoparticles, the quest for a coating that heals its own scratches has come up short. The latest attempt, though, seems a little more promising. It combines natural sunlight with a substance that occurs naturally in nature. Bio-mimicry continues to provide interesting answers to perplexing problems of science and technology, and the use of chitosan as part of a self-healing polymer is another example.The coating isn’t quite ready for commercial use, however. There is no answer to what happens when a second scratch is made over the position of the first scratch. And what happens if you have intersecting scratches? Nevertheless, there is tremendous potential for this coating.© 2009 PhysOrg.com Explore further Citation: Self-Healing: Sunlight Helps Scratches on Cars, Electronics and Furniture Disappear (2009, April 2) retrieved 18 August 2019 from https://phys.org/news/2009-04-self-healing-sunlight-cars-electronics-furniture.html ‘Crabby’ compound that skewers bacteria could prevent medical implant infections Will the iPod be able to heal itself of scratches? Image source: Goldmund100 via Wikimedia Commonslast_img read more

Honey bee search strategy Robot swarms to search Mars caves

first_img Explore further The theory behind Kisdi’s robots incorporates the idea of quorum sensing, similar to that used by honey bees. Quorum sensing is a type of decision-making process used by groups to coordinate behavior and can be seen with honey bees when worker bees scout for new nest areas. Bees will leave the nest, gather information, and determine the best new location.Kisdi’s theory works on this same principle. A computer program has been created that functions in a similar way to the honey bees. The robots, called Jollbot, are a rolling and jumping robot. Mars surface. Jollbot A Lander would be able to release the swarm of 40 to 60 robots, allowing them to then individually go out and search for pre-programmed information, such as a difference of temperature found in a cave. Once a robot locates this information, it would return to the lander via the shortest route, and upload the information (temperature readings and coordinates).Once the information is uploaded, the robot can then evaluate information shared by previous robots and decide to either start a new search or revisit a previous finding for more information. As information is collected, those sites which the robots decide to be a potential site for more exploration can then be sent to mission control for further exploration by other rovers. This concept would be cheaper to build than the large rovers and allow for much more initial exploration, leaving the in-depth exploration for the rovers. The other benefit with this idea is that should one of the Jollbots in the swarm be lost or not function, the search process is still able to continue.In the simulation shown by Kisdi, a swarm of 50 robots would be able to cover a 300 square meter area in around 5 days. With the addition of more robots with a greater search capability, the search area would be able to be increased.Kisdi’s next step is to begin developing the hardware required for the robots, but the idea of a swarm of honey bee robots opens up the potential for much more in-depth searches becoming possible on Mars. Citation: Honey bee search strategy: Robot swarms to search Mars caves (2011, March 22) retrieved 18 August 2019 from https://phys.org/news/2011-03-honey-bee-strategy-robot-swarms.html Thanks to RoboEarth the bots can learn on their owncenter_img More information: Future robotic exploration using honeybee search strategy: Example search for caves on Mars, by Áron Kisdia and Adrian R.L. Tatnall, Acta Astronautica, Article in Press. doi:10.1016/j.actaastro.2011.01.013 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. © 2010 PhysOrg.com (PhysOrg.com) — In a recent paper published in Acta Astronautica, Aron Kisdi, a University of Southampton engineer, proposes an idea of utilizing a swarm of robots to search large areas of Mars and the caves which current robots have been unable to explore.last_img read more

Plastic products could easily become electronic with first moldable allcarbon circuits

first_img More information: Dong-Ming Sun, et al. “Mouldable all-carbon integrated circuits.” Nature Communications. (2013) DOI: 10.1038/ncomms3302Dong-Ming Sun, et al. “Flexible high-performance carbon nanotube integrated circuits.” Nature Nanotechnology. (2011) DOI: 10.1038/nnano.2011.1 © 2013 Phys.org. All rights reserved. (Left) All-carbon device fabricated on a flexible polymer substrate. (Right) The ON and OFF currents of the all-carbon transistor for different bending levels. Credit: Sun, et al. ©2013 Macmillan Publishers Limited The new circuits are composed of different types of carbon materials, with the active channels and passive elements consisting of carbon nanotubes, and the dielectric layers and substrates consisting of the plastic polymers polymethyl methacrylate (PMMA) and polyethylene naphthalate (PEN), respectively. Journal information: Nature Communications In a new study, researchers have for the first time developed integrated circuits that are composed entirely of flexible carbon-based materials, and can be molded into various shapes using the same molding techniques used for shaping plastic products. The development could allow electronic circuits to be easily integrated into a variety of plastic products, including everything from medical devices to plastic products around the home.”The plastic cases of smart phones and tablets, which are just protecting the electronic devices inside, will have electronic functions such as displays, touch sensors, and so on, making smart phones more functional and fashionable,” Yutaka Ohno of Nagoya University in Japan and Aalto University in Finland told Phys.org. “By integrating other functions such as displays and sensors into plastic devices, we are thinking of developing 3D interactive information communication devices, which can be used in medical settings, for example.”Ohno, along with Dong-Ming Sun of Nagoya University and their coauthors, have published a paper on the moldable all-carbon integrated circuits in a recent issue of Nature Communications.”The key point in our design is that the all-carbon devices are made of carbon nanotubes and polymers, and they exhibit better flexibility and stretchability compared with devices fabricated from rigid metals and oxide insulators, making the devices much more flexible and elastic,” Sun said. “The results of this study make it possible to achieve a fusion of electronic devices with plastic products, which can lead to the creation of plastic electronic devices that feature both designability and functionality.” Carbon nanotube transistors could lead to inexpensive, flexible electronics (Phys.org) —There has been a great deal of research lately on flexible electronics, but so far these devices (which are mostly made of carbon) still use metal electrodes and oxide insulators, and these rigid materials limit device flexibility. Some polymers and ionic liquids have been introduced as flexible alternatives, but have poor performance in terms of high operating voltages and low operating speeds, respectively.center_img Citation: Plastic products could easily become electronic with first moldable all-carbon circuits (2013, August 23) retrieved 18 August 2019 from https://phys.org/news/2013-08-plastic-products-easily-electronic-moldable.html (Left) A dome-shaped all-carbon device (scale bar, 10 mm). Inset: magnified photograph (scale bar, 1 mm). (Right) Illustration of the cross-section of the air-assisted thermopressure-forming apparatus used to mold the all-carbon device. Credit: Sun, et al. ©2013 Macmillan Publishers Limited Unlike the polymers and ionic liquids that have been previously tried as materials for flexible dielectrics, the PMMA that the researchers used here can enable transistors and integrated circuits to operate at low voltages and high speeds. The low operating voltage can be explained in part by the sparse, network-like carbon nanotube thin film used as the channels, which enhances coupling between the channel and gate electrode compared with using thick polymers as the channels.Previously, the researchers successfully fabricated a thin-film transistor with a mobility greater than 600 cm2V-1s-1 by developing a technology for forming a long, yet pure, carbon nanotube film on plastic. In the new study, the researchers made further progress on the optimization of the film-forming technology, achieving a mobility of 1,027 cm2V-1s-1. This mobility is higher than that of a MOSFET, which uses monocrystalline silicon, and the researchers describe it as an astonishing value for a thin-film transistor fabricated on a plastic substrate.Because these all-carbon devices are made of carbon nanotubes and polymers, they exhibit better flexibility and stretchability compared with devices fabricated from rigid metals and oxide insulators. Perhaps the most useful feature of the all-carbon circuits is their moldability, which the researchers demonstrated by heating and blowing a planar substrate to form a dome-shaped structure. The 3D dome is stretched during this molding process without cracking, in sharp contrast to rigid materials such as metals. The extreme stretchability of both the passive and active elements of the devices can allow them to be formed using the same molding techniques used today to shape plastic products. In order to scale up the devices, the researchers note that it will be important to grow carbon nanotubes with a uniform length and diameter to minimize current variation. Eliminating metallic nanotubes can also offer further performance improvements. They also hope to use fabrication methods other than the lithographic methods they used here.”It is desirable to form carbon nanotube channels and wirings at atmospheric pressure and low temperature by high-throughput printing techniques rather than current lithographic techniques,” Sun said. 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. , Nature Nanotechnologylast_img read more

Of notebooks and revolutions

first_imgThe Book Office of the Institut français en Inde or the Embassy of France in India is proud to be associated with the release of the English translation of Chowra Makaremi’s Le Cahier d’Aziz. Au cœur de la révolution iranienne (Gallimard, 2011) published in India by Yoda Press under the title Aziz’s Notebook: At the Heart of the Iranian Revolution.The author will be in conversation with books editors and press on 18 March. Head over for an interesting talk.last_img

Moments arrested in time

first_imgOfficially, a day before the chromatic festival, New Delhi based photographer Gaurav Singh is feisty this Holi with his vibrant manifestations. Arrested Moments, an exhibition of his photographs was inaugurated by Bhupinder Singh Hooda, Chief Minister of Haryana at Lalit Kala Academy. A collection of photographs portraying abstract human emotions, from the demon inside to the serenity, through Gaurav’s iris transpires to be, painted brush strokes. The photographs talk a hazy visual language but iridescent emotions and in deed a feast for a photography lover. Also Read – ‘Playing Jojo was emotionally exhausting’After lighting the lamp with Deepender Singh Hooda, Member of Parliament and Gaurav Singh, Bhupinder Singh Hooda released the catalogue of the photographs and accoladed the photography as dedicated and unique. Deepender Singh expressed his sincere wishes to Gaurav Singh to achieve more feats in photography.Gaurav Singh, who says photography as his raison d’etre says, ‘Human emotions and Nature are my inspirations.’ In his words his work is an amalgam of some of the most creative moments of his experiential spectrum and a reflection of his individual psyche.On 28 March Maha Mandaleshwar Pujya Shri Kailashanad Ji Maharaj, Dakshin Kali Mandir, Haridwar will bless the event with his presence.The exhibition is on from 26 March to 2 April at the Lalit Kala Akademy.last_img read more

MCD dithers holds up National Intelligence Grid

first_imgAs the Centre went about issuing an advisory on how to tackle terror in schools, its flagship intelligence security project – National Intelligence Grid (NATGRID), proposed after 26/11terrorist attack in Mumbai, got stuck in a land dispute between South Delhi Municipal Corporation and Delhi Development Authority. On Friday, the standing committee of the civic body refused to pass the layout plan of the NATGRID building and directed the municipal commissioner to approach Delhi High Court to safeguard its interests on the disputed land. Also Read – Need to understand why law graduate’s natural choice is not legal profession: CJI“We will pass the layout plan of the building only if the payment made by Union Ministry for Home Affairs to DDA is paid to South DMC plus annual ground rent of the proposed building or DDA must allot a similar 10 acre land at a suitable place to construct infectious disease hospital proposed by the corporation,” said Subhash Arya, chairman of the standing committee of South DMC and ‘referred back’ the matter. The 10 acre land which is part of a 22.15 acre plot of South MCD at Andheria More in Mehrauli was given to CRPF on rent to set up a temporary unit two years back. The price of the plot is estimated to be Rs 7.4 crore. Also Read – Health remains key challenge in India’s development: Kovind“Neither DDA nor Land & Building department could present any record but the officers of the ministry accepted the verbal claims of these agencies to accept the ownership of DDA on the land,”  said Manish Gupta in a written reply in the meeting. He further added that the decision of the Additional Secretary of Union Ministry for Urban Development Bhupendra Bahuguna to reject all their documents of ownership as ‘not credible’ was wrong and arbitrary. “We are ready to put all our records for forensic test,” Gupta said. Amid the furious debate on the issue the commissioner was pulled up by all  members of the standing committee cutting across party lines for his inability to present the matter to the ministry in a proper way.  Taking part in the debate leader of Opposition Farhad Suri said, “South MCD functions as per an act of parliament so we are equal to any central government agency. No one is above us but parliament,” said Suri. NATGRID was proposed in 2008 by the Union Ministry of Home Affairs and it approached South MCD in October 2013 to approve the layout plan of the building. After the new government took charge at the Centre it was expedited and three meetings were held between South MCD and NATGRID officers. On 7 October MHA asked South MCD to pass the layout plan ex post facto as the matter related to national interest and take the approval of the standing committee later but the civic body refused. On 14 October MUDS summoned a meeting of all the stakeholders and land ownership was decided in favour of DDA.last_img read more

Oust BJP in 2019 Mamata

first_imgKolkata: A sea of humanity defied torrential rain and inclement weather on Saturday to attend the July 21 Martyrs’ Day rally, where Chief Minister and Trinamool Congress supremo Mamata Banerjee spelt out the party’s strategy in the 2019 Lok Sabha elections.Lakhs of people were witness to a historic announcement which would mark a definite “movement” of a sort from this day onwards for the Trinamool Congress workers and its leaders with their task cut out for the forthcoming 2019 Lok Sabha polls. Also Read – Rain batters Kolkata, cripples normal lifeA confident Mamata Banerjee, more passionate than ever, with an unflinching pledge to free India from the clutches of the BJP, announced: “We will win all the 42 Lok Sabha seats in the state. It is our pledge. We will oust the BJP to save the country. We will organise a big rally here in January and invite all the (Opposition) leaders.”The Trinamool Congress will organise a rally at the Brigade Parade Ground on January 19, 2019, which will be attended by all the Federal Front leaders to usher in the BJP’s collapse. Speaking on the 25th anniversary of the Martyrs’ Day programme, the Chief Minister said: “The gathering at the Brigade will be more than today’s rally and I will request all the Federal Front leaders to address the meeting. We do not care for the chair but we are more concerned for the people of this land. We will show the way to Parliament.” She also instructed the party leaders to start preparations for the grand rally from November itself, immediately after the Durga Puja. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedShe also charted out the party’s programmes for the next few months. On July 27, Nanoor Divas will be celebrated and Firhad Hakim along with Anubrata Mondol will address the gathering. On July 28, party’s youth Congress president Abhishek Banerjee along with Partha Chatterjee, Firhad Hakim, Kalyan Banerjee and Suvendu Adhikari will address a rally at the Midnapore College ground, the venue from where Prime Minister Narendra Modi had addressed the rally on July 16. From August 1 to 15, meetings will be held all over the state to spread the message of communal harmony. On August 9, Mamata Banerjee will be present at a meeting in Jhargram where the theme will be “BJP, quit the country”. The meeting will be held to remember the Quit India movement which was organised against the British Rule in 1942. In September, the party will celebrate Teachers’ Day in which teachers from various schools, colleges and universities will be felicitated in every area. A convention will be held on September 17 under the leadership of Abhishek Banerjee. Coming down heavily on the BJP, Banerjee predicted that the saffron party will not be able to get more than 100-150 seats in the 2019 Lok Sabha polls as the situation will be completely different. She said the BJP had secured 325 votes while the Opposition got 126 votes at the no-confidence motion held on Friday because “AIADMK had voted for the BJP but the MPs would not have voted for the party had Jayalalithaji been alive. In 2019, Stalin will get the seats.In Uttar Pradesh, if Mayawatiji and Mulayamji join hands, then the BJP’s seats will come down to 30.In Madhya Pradesh, now the BJP has 28 seats which will come down to one fourth. In Rajasthan, the party has 25 seats which will come down to 5. In Bihar, Laluji will get more seats. In Gujarat, the BJP will not get any seat. In Bengal, the TMC will get all the 42 Lok Sabha seats.” She further added: “The number of votes the BJP got on Friday was on the floor of the House but outside, the scenario is totally different and take it from me that the BJP will not win in 2019 as people will not vote for the party.”Calling the BJP a “sword brandishing or gun-toting Hindu,” she said the BJP has actually insulted Hinduism. “We do not accept the BJP’s Hindutva. The party has insulted Hinduism. We follow the Hinduism that has been professed by Sri Ramakrishna and Swami Vivekananda. We believe in tolerance and universal acceptance,” she maintained.Accusing the BJP of spreading hate politics, she said throughout the country, the party is trying to divide society. Referring to the statement made by the Prime Minister and Home Minister Rajnath Singh in Parliament on Friday that the state governments should take stern action to stop lynching, she said: “The party should first try to control the language of the state president. He talks about burning down police stations and assault the TMC supporters, thus polluting the social environment.” She added: “The BJP is involved in lynching throughout the country and the leaders have blood on their hands.”Banerjee said Congress leaders in Bengal should decide whether they will go with the TMC or not. “In Delhi, we are supporting them but here the Congress, CPI(M) and the BJP have joined hands against us. This cannot be tolerated.”Referring to the collapse of the pandal at Modi’s rally in Midnapore, she said: “The party that cannot prevent the collapse of a pandal, how do you expect them to run the country properly? But it is not about the pandal. They are trying to divide the country and this trend is dangerous.”The Chief Minister said canards are being spread against the TMC over the Panchayat elections. “In Uttar Pradesh, 71 percent seats are won uncontested while in Sikkim 85 percent seats are won unopposed but no one says anything about that. In Panchayat elections, local issues and candidates are important and in Jhargram, even the TMC could not file candidates in several seats but I did not complain about it. I pity those who fail to understand this small equation.”last_img read more

Nepal elects first woman as parliament speaker

first_imgKathmandu: Nepalese lawmakers on Friday elected the country’s first woman speaker of Parliament following formation of a new government after promulgation of the Constitution.Parliament unanimously elected UCPN-Maoist lawmaker Onsari Gharti Magar as the Speaker of the House.Nepal’s Constituent Assembly was converted into the legislative Parliament after the promulgation of the Constitution on September 20 following which K P Sharma Oli was elected as the new prime minister defeating incumbent Sushil Koirala in a contest which became necessary after parties failed to forge a consensus amid violent protests over the country’s new Constitution. Also Read – Nine hurt in accident at fireworks show in French resortGharti was elected unanimously to the post after Nepal Workers and Peasants Party withdrew the candidacy of its lawmaker Anuradha Thapa Magar.With the victory, Gharti became the first woman to lead the legislative body in Nepal’s parliamentary history. Earlier she had served as Deputy Speaker in Parliament.Gharti was backed by the ruling coalition, consisting of CPN-UML, UCPN-Maoist, Rastriya Prajatantra Party-Nepal, Madhesi Janaadhikar Forum-Democratic and some fringe parties. The main opposition Nepali Congress had also extended support to her candidacy.last_img read more

Elderly woman stabbed in Salt Lake area

first_imgKolkata: An elderly woman was stabbed by an unknown miscreant who had come to her apartment in Salt Lake area seeking monetary help for his ailing mother on Friday.According to locals, one Jayashree Chakraborty aged about 71 years, was alone in a flat inside Cluster III of Purbachal Housing Complex. Around 11:30 am, Jayashree heard someone knock on the door and she thought that it might be her grandson who has come back from school. Without asking, she opened the door and saw the man at the door, wearing a helmet. Also Read – Rain batters Kolkata, cripples normal lifeSources informed that the miscreant asked Jayashree for money and before she could react, he started stabbing her. When she screamed, he took some cash from her bag and fled. Jayashree then somehow managed to alert her neighbours. Seeing her bleed, her neighbours immediately called Jayashree’s son Anish and narrated the incident. Jayashree was admitted to a private hospital in Salt Lake with serious stab injuries. Later, Bidhannagar South police station was informed. Sleuths went to the apartment and investigated the incident spot. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedThere was no CCTV installed in the housing. Due to this, the cops are in the dark about the miscreant. Later police met Jayashree and recorded her statement. Following this, police were able get hold of a CCTV camera footage on the road where a person was seen. As per Jayashree’s description, police identified several similarities with the person seen in the footage. It is suspected that the miscreant did not have any intention of robbery. Thus, he did not take any ornaments which could be robbed easily as Jayashree was not in a condition to resist. To know if the Chakraborty family had any enmity with anyone, sleuths are questioning them. The security guards of the housing complex have also been questioned.last_img read more

Forest dept undertakes steps to increase green cover

first_imgKolkata: The state Forest department is taking measures to increase the green cover in the state that is rapidly depleting due to urbanisation.”The loss of green cover is a world-wide concern and we have to address this issue along with reducing pollution and controlling carbon emissions. The present forest cover in our state is only 14 percent. We have to take it up to 30 percent and make the state a better place to live in,” Mayor Firhad Hakim said at the inaugural programme of the 16th edition of Flower Fair, popularly known as Phool Mela at Eden Gardens on Thursday. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedStressing on planting trees as the only alternative to bring down carbon emissions, Hakim said 40 percent of state population is suffering from Asthma because of depleting oxygen content. Under the instructions of Chief Minister Mamata Banerjee, Hakim has created a separate department of Urban Forestry at the Kolkata Municipal Corporation. He had held several meetings with the Railways and Kolkata Port Trust that own a reasonable amount of land in the city and have a kept a proposal in front of them asking to allow the civic body to plant trees on vacant lands not used for any commercial purposes. Also Read – Bose & Gandhi: More similar than apart, says Sugata BoseDifferent agencies from both Centre and state have been asked to take up plantation on their own or they can also urge the civic body to take up such initiatives on their behalf. State Forest minister Binay Krishna Barman said his department has recently handed over 1,000 saplings each to all MLAs in the state urging them to plant them in their respective areas. “We have planted 20,000 saplings and had distributed the same on last year’s Vanmohatsav in July. We are also conducting awareness programmes to inform people that stale flowers can be recycled and put into good use including generating employment. Discarded Marigold flowers are being used in some parts of the state for manufacturing Abir during Doljatra and Holi,” the minister said. The Flower Fair at Eden Gardens that kicked off on Thursday will continue for three days.last_img read more