Month: August 2019

Writing Patterns on Carbon Nanotubes With Polymer Chains

first_imgThe alternating pattern of PE and PEO formed on single-walled carbon nanotubes with a 12-nanometer period imaged using transmission electron microscopy. The dark and bright stripes represent the PEO and PE domains, respectively. Image courtesy Christopher Li. Plumbing Carbon Nanotubes Now, as reported in a recent edition of Nature Nanotechnology, a research group has successfully used polymers to create well defined patterns onto single-walled carbon nanotubes.“Very few reports have address periodic patterning on nanotubes, and those studies that have been conducted resulted in patterns that were poorly repeating rather than nicely periodic and uniform,” said the study’s corresponding researcher, Christopher Li of Drexel University, to PhysOrg.com. “The success of our work appears to be in the polymer material we used.”The group chose a block copolymer, a polymer chain formed by two (or more, in some cases) short polymer chains. In this case the two components are polyethylene (PE) and polyethylene oxide (PEO).Li and colleagues at Drexel deposited a single-walled carbon nanotube solution onto a pre-fabricated carbon-coated grid. The nanotubes lined up on the grid surface and the group decorated the nanotubes with a solution containing the copolymer. The result is a copolymer/nanotube hybrid, which the group analyzed using a transmission electron microscope.Even with the powerful microscope, the nanotubes were not visible under the copolymers, which formed worm-like structures with alternating dark and bright stripes (corresponding to the PEO and PE blocks, respectively). But the consistent spatial orientation of the stripes, and the size of the “worms,” averaging 50 nanometers wide and one micrometer long, indicate that the polymer chains forming the stripes had aligned with the long axes of the nanotubes; the stripes, then, cut across the nanotubes perpendicularly.The researchers used copolymer solutions of varying concentrations and found that the stronger the solution, the more stripes formed on each nanotube. The process causing this to occur, they propose, begins when the copolymer molecules randomly adsorb onto a nanotube surface. These molecule clusters nucleate the growth of crystals and, with increasing concentration, more crystals appear, growing into larger patches.At a critical concentration the patches connect and clear stripes begin to form. And when the concentration is too high, there are so many crystals forming on the nanotubes that they don’t have time to align properly.The period of the stripe pattern – that is, the distance between alternating stripes – is about 12 nanometers. This regularity is a key step toward fabricating multiple transistors on individual nanotubes.Additionally, the group was able to attach gold nanoparticles to the copolymer/nanotube hybrid structures in fixed locations, adding another functional element to the pattern. This shows that it is possible to pattern other structures onto the nanotubes, a route toward tailoring them specific tasks in nanoelectronics.More information: Bing Li, Lingyu Li, Bingbing Wang and Christopher Y. Li Nature Nanotechnology advance online publication 26 April 2009, DOI: 10.1038/nnano.2009.91Copyright 2009 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) — Carbon nanotubes are at the center of the nanoelectronics research movement, with scientists making great progress toward getting nanotube-based electronic devices into the hands of consumers. But one area of carbon nanotube research where there has been considerably less success is creating repeating, regular patterns onto individual nanotubes, a task necessary for a key goal of nanoelectronics: patterning transistors directly onto nanotube surfaces. Citation: ‘Writing’ Patterns on Carbon Nanotubes With Polymer Chains (2009, May 19) retrieved 18 August 2019 from https://phys.org/news/2009-05-patterns-carbon-nanotubes-polymer-chains.html Explore furtherlast_img read more

Humancomputer music performances use system that links music and musical gestures w

first_imgIn this image from the video below, computers, robots, and humans perform together in the Machine Orchestra, which uses the captured musical gestures. Image credit: Ajay Kapur. A demonstration of the gesture recognition system: in the second half of the video, the recognition system is parsing the events. When it detects a rim hit, it changes its pre-set processing on the physical modeling. Video credit: Adam Tindale. “The main advantage of the method is that it allows large amounts of training data for machine learning algorithms to be acquired without human annotation simply by playing an instrument enhanced with sensors,” Tzanetakis told PhysOrg.com. “Once the surrogate sensor has been trained and its performance evaluated, then it can be used in place of the actual physical sensor on unmodified instruments of the same type.” Citation: Human-computer music performances use system that links music and musical gestures (w/ Video) (2010, November 9) retrieved 18 August 2019 from https://phys.org/news/2010-11-human-computer-music-links-musical-gestures.html The system overcomes the previous difficulties in that it doesn’t hinder the performers or their instruments when performing, and doesn’t require large amounts of processing and analysis, greatly reducing time requirements. For instance, data from snare drum samples that took nearly a week of manual labor can be processed in less than an hour with the new method.The researchers demonstrated the system with professional musicians playing electronic sitars and electronic snare drums. The results showed that the trained surrogate sensors can accurately determine musical gestures when different musicians were performing, and not only the performer who was used to train the surrogate sensor. Further, any kind of performing (such as improvisation or playing a song) could be used to train the surrogate sensor. Musical illusion fools audiences and performers, says researcher 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. More information: — Adam Tindale, et al. “Training surrogate sensors in musical gesture acquisition systems.” IEEE Transactions on Multimedia. To be published. DOI:10.1109/TMM.2010.2089786 .—www.adamtindale.comcenter_img In a new study, researchers have developed a method for capturing musical gestures and mapping them to sounds that overcomes some of the disadvantages of previous methods. Adam Tindale, Ajay Kapur, and George Tzanetakis – all trained musicians and computer scientists working at the University of Victoria in Victoria, Canada – have described the new method in a study to be published in IEEE Transactions on Multimedia. The method grew out of the authors’ experiences in developing instruments for interactive human-computer music performances. At the time, Tindale and Kapur were both completing their PhDs at the University of Victoria. Tindale now works at the Alberta College of Art and Design and Kapur works at the California Institute of the Arts and the New Zealand School of Music.As the researchers explain in their study, there are two main approaches for capturing musical gestures. One approach is direct acquisition, which involves attaching permanent sensors to instruments to create “hyper-instruments.” However, this approach is often invasive to performers and requires modification of expensive instruments. The second approach is indirect acquisition, which involves using a microphone to capture the sound, as well as sophisticated signal processing and machine learning algorithms to extract gestures from the sounds, which requires large amounts of training.The researchers’ new method is somewhat of a hybrid of these two approaches. They temporarily attach sensors to an instrument to capture musical gestures and a microphone to capture sound. This data is analyzed, and the gesture-sound mappings are used to train machine learning models to extract gestures from sounds only. These machine models then create what the researchers call a “surrogate sensor,” which behaves like the original invasive sensor but is not attached to the instrument. The surrogate sensor can determine the musical gestures based only on the analyzed sound captured from the microphone. (PhysOrg.com)—Every musical sound comes from a specific way that an instrument is played. With modern technology such as sensors, signal processing, and sometimes machine learning algorithms, researchers can determine the precise musical gesture used to produce a particular sound on an instrument. The ability to recreate musical gestures from sounds can be used for interactive human-computer music performances, music transcription, and other innovative applications. 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 Computers, robots, and humans, including coauthor Ajay Kapur, perform together in the Machine Orchestra. Credit: Ajay Kapur In the future, the researchers plan to make the system more sensitive to additional features, such as training it to recognize the type of mouthpiece used by a woodwind instrument and the string on which a note is played on a violin. Both Tindale and Kapur currently use the system during musical performances, as shown in the accompanying videos. “Basically, the gesture information extracted is typically used in the following ways,” Tzanetakis explained. “(1) To map performance information to sound and a music generation algorithm that react in real-time expressively to the music; (2) to drive animations and visuals; (3) to synthesize sounds parametrically (for example, a synthesized drum sound might change based on where the snare drum is hit); and (4) to do analysis of the music played (for example, automatically tracking the tempo) in the context of computer-controlled robotic instruments interacting with humans.”last_img read more

Mesoscale eddies found to move far more ocean water than previously thought

first_img More information: Oceanic Mass Transport by Mesoscale Eddies, Science DOI: 10.1126/science.1252418ABSTRACTOceanic transports of heat, salt, and fresh water, dissolved CO2 and other tracers regulate global climate change and distribution of natural marine resources. While the time-mean ocean circulation transports fluid as a conveyor belt, fluid parcels can also be trapped and transported discretely by migrating mesoscale eddies. By combining available satellite altimetry and Argo profiling float data, we show that the eddy-induced zonal mass transport can reach a total meridionally integrated value up to 30-40 Sv (1 Sv = 106 m3 s−1), and it occurs mainly in subtropical regions where the background flows are weak. This transport is comparable in magnitude with that of the large-scale, wind- and thermohaline-driven circulation. Three-dimensional structure of an oceanic mesoscale eddy and the fluid trapped by this eddy. Credit: Sergey Kryazhimskiy Journal information: Science Explore further First direct evidence that breaking waves cause horizontal eddies (Phys.org) —A trio of researchers, two from the Ocean University of China, and a third from the University of Hawaii, has found that mesoscale eddies—swirling masses of water that travel westward in the subtropics—appear to carry far more water with them than scientists have realized. In their paper published in the journal Science, Zhengguang Zhang, Wei Wang and Bo Qiu discuss the study they undertook of the water vortices using altimetry and data from ARGO submersibles to measure the size of the eddies and to track their movements over time.center_img Mesoscale eddies are spinning masses of water (50 to 300 miles in diameter) that fall between observable eddies such as those created by ships and very large ones known as gyres. Scientists have known about them for quite some time, but till now, very little was known about their size and movements. To find out more, the researchers analyzed data from both satellites and submersible probes.Satellites operated by NASA have radar onboard that is sensitive enough to measure the altitude of the Earth’s surface to within inches—and that includes the oceans. Mesoscale eddies can be detected due to depressions formed as they spin. The researchers collected a decade’s worth of such data allowing them to create an animated map that shows the movement of multiple mesoscale eddies across the oceans—always moving east to west, and generally in subtropical regions, where background flows are weak. The team also studied data from the more than 3,000 ARGO submersibles that have been deployed to various depths in the world’s oceans—that allowed them to create 3D renderings of the eddies as they exist beneath the surface.Putting all the data together, the team was able to see that such eddies can live for months, or even years—it also allowed for calculating how much water they carry, approximately 30-40 Sv (1 Sv = 106 m3 s−1), which is roughly equivalent to the amount of ocean water moved by wind or due to temperature variations. The amount is far more than most oceanographers had imagined, and stirs questions regarding the role they may play as the oceans grow warmer.The researchers plan to continue their research, focusing most specifically on how tightly the eddies hold on to material they capture, such as floating debris, pollutants, heat and carbon. © 2014 Phys.org Citation: Mesoscale eddies found to move far more ocean water than previously thought (2014, June 27) retrieved 18 August 2019 from https://phys.org/news/2014-06-mesoscale-eddies-ocean-previously-thought.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.last_img read more

Made in India and for a cause

first_imgEmpowerment in association with Uttarakhand Artist Welfare Association are running Handloom clusters for tribal women artisans and weavers affected from Uttarakhand disaster. It motivated them to pick up the threads of their life using their craft to move on. This effort has resulted in many tribal women coming together and creating beautiful handmade and hand woven products.These products will be showcased in an exhibition Colours of Himalayas being organised on  December 12 at Artizen Art Gallery in the Capital. On display will be shawls, stoles, carpets, bamboo products, copper ware products, paintings and photographs depicting Uttarakhand and its crafts. All proceeds from the resulting sales of the products will directly go to these women artisans and weavers, motivating and inspiring them to come back to normal stream and move towards sustainable development. Also Read – ‘Playing Jojo was emotionally exhausting’Santosh Kumar Gangwar  Minister of State for Ministry of Textiles (IC) will be inaugurating the exhibition as the chief guest of the event. The exhibition will remain open till December 14.The exhibition is being curated by Sonika Agrawal and Kumar Vikas Saxena, who have closely watched these women going from being totally helpless and dejected to the spirit of wanting to move ahead and create a better living for themselves and their families. They say, “The immersion of the tribal women in crafts have given them a purpose of life and renewed their strength and courage, providing them with hope for the future.” Also Read – Leslie doing new comedy special with NetflixEmpowerment, a sociocultural not for profit NGO, aims to preserve art and cultural heritage of India through promotion and revival of arts and crafts. A socially responsible organisation, Empowerment spreads its message and works through capacity building of women and youth. In June 2013, a cloudburst on the North Indian state of Uttarakhand caused devastating floods and landslides becoming the country’s worst natural disaster. The aftermath of this tragic turn of events left many homeless and wanting. Though relief poured in from various sectors, a sustained effort is required so that people are rehabilitated and empowered through capacity building and work towards sustenance. Towards this objective of filling in the gap for a sustained efforts and rural development, Empowerment and Uttarakhand Artist Welfare Association are actively working with flood affected tribal women belonging to remote areas of Pithoragarh, Uttarakhand. This initiative has motivated the women to pick up the threads of their life using their craft to move on. It has also resulted in many tribal women coming together and creating beautiful handmade and hand woven products.Empowerment and Uttarakhand Artist Welfare Association are non-profit organizations, registered under the Societies Registration Act XXI, 1860 that actively advocates using art, culture and traditions as a tool for social change and emancipation, for creation of a sensitive, sustainable and peaceful world, for bringing nations closer and for forming a nexus between the citizens and governments.When: December 12-14Where: Artizen Art Gallery, Bahadur Shah Zafar marglast_img read more

Cricket mania looms large

first_imgAs the eighth edition of Indian Premier League concluded with the Mumbai Indians taking home the crown for the second time post a massive 41-run victory over two-time champions Chennai Super Kings, the IPL fever is refusing to die out among cricket fanatics. Despite being a punching bag for critics, who see it as nothing but cheap commercialisation of the game, the ground reality is strikingly different with its ever surging viewership according to TAM ratings. Also Read – ‘Playing Jojo was emotionally exhausting’The tournament continues to be hugely popular among children, who are not bothered by the controversies surrounding the tournament and watch it to get their dose of entertainment. The conclusion of this season, however, has created a void and has left many miserable as no major sporting tournament is scheduled to catch their fancy anytime soon, India being majorly a cricket loving nation.Sarthak Saini, 16, has mixed feelings over the ending of this season. He is ecstatic as his favorite team has taken the title, but at the same time gloomy as the good times have ended. “This season of the IPL has been special as my favourite team has won the title. But there is nothing interesting to catch up on television now,” he said. His opinion is similar to that of Vaibhav, 15, a CSK fan and budding cricketer. He said, “Although CSK eventually lost, overall the tournament has been exciting. I have watched almost every match since the beginning of my summer holidays and now the rest of my vacation is going to be quite boring.” Also Read – Leslie doing new comedy special with NetflixOn the other hand, Ayachi, 22, does not care much.” I supported KKR and lost interest in the tournament once they were out. I am disappointed, but hope to see them buckle up for next season. Being a sports aficionado, I have much to look forward to with the French Open in tow”, she said.The Indian Cricket team has a packed schedule this year. The team would be heading to Bangladesh for a test and then leave for the Zimbabwean shores in July to play a bilateral series comprising three One Day Internationals and two T20 ventures. However, both these series cannot match up to the excitement of IPL for youngsters. However, 15-year-old Smriti Jha said: “I am waiting for the series against Pakistan in December as that promises some real action.”  The reason for IPL’s high popularity among children seems to be its perfect amalgamation of cricket, glamour and entertainment. The tournament also gives fans a chance to see their favorite players from across the world on the same platform. “Although IPL cannot compete with other formats of Cricket in terms of standard, still I like it because it gives me an opportunity to see the likes of Kohli, De Villiers and Gayle playing together”, said Sanjeev,19, a diehard RCB fan. Since its inception, the tournament has been raising bars and has touched pinnacle this year. Although the cricket extravaganza has ended for this session, it promises to be back with a bang next year. Wait for the action!last_img read more

Governor releases ASSOCHAM Knowledge Report

first_imgKolkata: West Bengal Governor K N Tripathi today said there is increased realisation on quality of education at school level. Delivering his address at the ‘ASSOCHAM EduMeet 2018’ here, Tripathi said, Centre is working on certain focus areas like school curriculum, teachers skill with the intention to develop new ways and “create an eco-system which is self-sustainable and ever evolving.” “Our Prime Minister Narendra Modi is working hard on creating a framework,” Tripathi said. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killed The Governor said, “There is increased realisation on quality of education at school level with both government and private participation.” Stating the government was giving focus on pre-school, Tripathi said right to pre-school education was essential to help build up the formal education system. “In this regard private and government partnerships can help in sharing resources, experiences and help build a strong foundation,” he said. Pointing out India had immense potential to be an education hub and attract students and faculties across globe, Tripathi said, “In ancient days we had centres of excellence which attracted foreign learners.” Also Read – Naihati: 10 councillors return to TMC from BJP “Time has come up again in the present age to build modern centres of excellence which will put increased focus on learning outcomes,” he said. Talking about various methods of education in modern world, Tripathi said “education has evolved with times. Technological interventions will help to take education to masses,” propel economic and social growth and expand the educational social system. Tripathi said quoting a study that “We have 497 million people in education seeking category within the age of 5-24 years or 37.1 per cent of country’s total population.” “They form an important segment in accelerating economic growth,” he said. Tripathi also released the ASSOCHAM Knowledge Report on the occasion. Heads of different educational institutions from all over the country and ASSOCHAM Education Council members were present at the one-day meet.last_img read more

Tutoring can relieve math anxiety in kids

first_imgA one-on-one math tutoring programme can relieve anxiety about doing math problems in your kids, says a study by Indian-origin researchers.“The most exciting aspect of our findings is that cognitive tutoring not only improves performance, but is also anxiety-reducing,” said the study’s senior author Vinod Menon professor of psychiatry and behavioural sciences at Stanford University School of Medicine in California, US. Also Read – ‘Playing Jojo was emotionally exhausting’“It was surprising that we could, in fact, get remediation of math anxiety,” Menon noted. Even if they are good at math, many children feel anxious about doing math problems. For some, the anxiety persists throughout life, discouraging them from pursuing advanced math and science classes as well as careers that rely on mathematical expertise. The brain scans of the children with high levels of math anxiety showed activation in the brain’s fear circuits and so-called “fear centre”, or amygdala, before tutoring. Also Read – Leslie doing new comedy special with NetflixChildren then participated in an intensive, eight-week tutoring programme consisting of 22 lessons involving addition and subtraction problems. Tutors gave the lessons to each child individually. All of the children performed better on addition and subtraction problems after tutoring. The children who started the study with high levels of math anxiety had reduced anxiety after tutoring, while those in the low-math-anxiety group had no change in their anxiety levels.The study was published in The Journal of Neuroscience.last_img read more

Mitra lashes out at Centre for attempting to control Finance Commissions Terms

first_imgKolkata: State Finance minister Amit Mitra made a scathing attack at the Centre for its “attempt” to control the Terms of Reference (TOR) of the Fifteenth Finance Commission. This comes when there would be a loss of Rs 35,849 crore for Bengal, if the 2011 census is used as TOR of the Finance Commission.He was speaking in the state Assembly on Tuesday, during discussion over deprivation by the Centre in allocation of funds to the state government. A resolution was brought in the Assembly in this connection, in which the issue of the TOR of the Finance Commission has come up. Also Read – Rain batters Kolkata, cripples normal lifePartha Chatterjee, the state Parliamentary Affairs minister, also stated how Bengal is getting deprived of its rights as the Centre has reduced and even stopped giving its share of funds for different projects.Mitra said this is the first time when there has been attempts of the Centre in controlling the TOR of the Finance Commission, as it has been stated that “the Commission shall use the population data of 2011 while making its recommendation”. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedHe said: “It would lead to a loss of Rs 35,849 crore between 2020 to 2025 if the Fifteenth Finance Commission gives its recommendations on the basis of the 2011 census. In between 2020-21 and 2024-25, the state government will have to pay Rs 36,510 crore to clear its debt.”The population share in Bengal, which was 8.16 percent in 1971, had come down to 7.67 percent in 2011.He further said that it has been stated that the commission will examine whether revenue deficit grants would be provided at all. “This shows that it is direct intervention in a statutory body,” he said. He further said that he had attended a meeting in Andhra Pradesh, in which the ChiefMinister of Puduchery, Deputy Chief Minister of Delhi and Finance ministers of Kerala,Punjab and Andhra Pradesh were present. There was a detaileddiscussion over the TOR andrepresentatives of the six states went to the President to submita memorandum in this connec-tion.He further stated that there has also been steps to introduce surge charges and cess in most cases, as the state government doesn’t get its devolution from it. But in case of tax, there has to be devolution of Central tax to the states.This comes when almost all the political parties in Bengal had demanded enhancement of devolution of Central taxes to the states from 42 percent to 50 percent before the Fifteenth Finance Commission, during its visit in Bengal.last_img read more

Abhishek likely to visit Balurghat on August 7 boost party workers

first_imgBALURGHAT: Trinamool MP and party’s youth president Abhishek Banerjee is expected to visit Balurghat on August 7 in a party programme to boost up party workers in a bid to see good results for the upcoming Lok Sabha poll, South Dinajpur district party president Biplab Mitra said on Wednesday.Apart from Banerjee, senior party leaders Partha Chatterjee, Firhad Hakim and Subrata Bakshi are scheduled to attend Balurghat with him. According to Mitra, thousands of party workers and supporters covering all eight blocks will attend the programme, where Banerjee will deliver the message of party supremo Mamata Banerjee to exhibit her planning on how to fight with the communal forces in the forthcoming ballot battle in 2019. Also Read – Rain batters Kolkata, cripples normal lifeNotably, in the last Parliamentary poll, popular theatre personality Arpita Ghosh had bagged the Balurghat seat and dedicated it to Banerjee, while the people had voted for Mamata Banerjee to gear up the plethora of development projects undertaken during her two-term state ruling. Consequently and due to this, plenty of workers from different political parties have shifted to Trinamool in recent times.According to the political observers, Mamata has now set her target to strengthen the support base, covering each block of the district and the party has started boosting itself from the booth level. Mitra has asked the leaders and workers to initiate measures regarding the visit of Abhishek Banerjee. He has already conducted a party meeting at Gangarampur Marwari Bhavan on Tuesday, to chalk out a blueprint to ensure his visit becomes a memorable one.”Communal BJP is planning to stop development in Bengal. Our leader Mamata Banerjee is well aware of it. She has already delivered a stern message to us through her rejuvenating speech on Martyrs’ Day on July 21. Our party’s youth president Abhishek Banerjee is scheduled to arrive here on August 7, along with some senior state level leaders,” Mitra said.last_img read more

Official WhatsApp group on road repair works created

first_imgKolkata: Bidhannagar Police has found a unique way of communicating with the road repairing agencies in case urgent repairing work needs to be done.The Deputy Commissioner (headquarters) of Bidhannagar Police, Amit Javalgi created a whatsApp group, where working members and engineers from agencies like PWD, NKDA, NHAI and others were added.According to the officials, this step was found to be the fastest way to reach the agencies which are directly connected to road Also Read – Rain batters Kolkata, cripples normal liferepair works.It has been informed that during the month of June some officials came up with the idea to create a common platform for the purpose of staying updated with road repair works.During rainy season, major roads often get damaged that hampers the normal vehicular movement with high chances of accident.Following the creation of the whatsapp group — ‘Bidhannagar Road Update’ all the ‘Traffic Inspectors’ (TI) are to post any problem regarding road repairs and other related problems. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedThey have been ordered to give updates along with photos of the damaged areas whenever it is identified.As engineers and other members from road repairing agencies are there in the group, they can easily get the necessary information such as the location and the extent of damage which will help them to actquickly.The schedule of the work will also be shared in the group.”Our aim is to provide service to people. We have to ensure smooth and safe journey for them. For this, we need a fast communication process. This step is found to be very much useful,” said Javalgi.last_img read more