This years Nissan Leaf has battery issues

first_img Citation: This years Nissan Leaf has battery issues (2011, March 16) retrieved 18 August 2019 from https://phys.org/news/2011-03-years-nissan-leaf-battery-issues.html 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. Electric cars rolling out Like most new car issues the problem at hand is only effecting a small amount of users thus far, but several reports of the cars simply running out of battery with little to no warning have occurred in the 2011 model year. The stories all go a little something like this:The owner of one of these new Leaf’s will be driving along, usually on a highway, and they will get a notice that they are low on battery. You will get an estimated number of miles left from the on-board computer system. Whether you stay on the highway, or move onto less populated roads to get to your destination quicker, the car will up and die within the next five minuets, with no extra warnings to give you an indication that you are not going to make it home. There you sit, stranded on the side of the road, unable to even turn your car off.It’s not exactly a pleasant scenario, but it is happening. Many of the stranded are asking the same question. Why is this happening to me?Well, it seems that according to the company, you are looking at the wrong gauge. The miles left is an estimate, and cannot be relied upon until your car gathers more data about how you drive. The simple solution is to look at the state of charge gauge, which should give you a more accurate reading. So as it turns out this one may be a mix of mechanical failure and human error.center_img (PhysOrg.com) — Only an extremely small amount of new cars go from the lot to the road without owners having some kind of problems. It seems that one part or another will invariably cause problems. As it turns out electric cars are no exception to this rule, and the Nissan Leaf is here to prove it. Nissan LEAF Battery technology © 2010 PhysOrg.comlast_img read more

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Yamahaframe bike with scuba tank makes Dyson shortlist

first_imgThe O2 Pursuit was designed by Dean Benstead, an industrial designer and a graduate of RMIT University, in Melbourne, Australia. Benstead started out with a what-if idea: “Living in a world where people can commute in vehicles and have fun without impacting on the environment in a scenario that seems unachievable and unimaginable—what if we could?” He worked the idea into a functional prototype stage with numerous design iterations along the way. He said he conducted a validation of air as power source with the use of life-cycle analysis mapping and futuring. A Yamaha WR250R frame was fitted with a compressed-air engine, which is the DiPietro Air Engine developed by Engineair Australia, and a standard scuba diving tank. Last year, he showcased his O2 Pursuit air-powered motorcycle at the Sydney Motorcycle and Scooter Show. This year, the O2 Pursuit is one of the inventions that have been shortlisted for the upcoming James Dyson Award. There are 15 projects on the list and the winner and two runners-up will be announced on November 8. (Phys.org)—Look what an Australian designer would like us to roll with in a no-emissions future: A motorcycle powered by nothing but air. Adding to a growing portfolio of ideas centered around compressed-air engines, this good-looking entry is called the 02 Pursuit. As an alternative-fuel bike, it reaches impressive speeds, given that is powered by a tank of compressed air. Opened up all the way, according to claims, the O2 Pursuit can do over 60 miles on a single tank and can zoom past trees and mountains at 87 mph. The obvious advantage to electric bikes would be that this Pursuit cycle would not require the big heavy batteries, long re-charging waits, and thoughts about battery disposal. Citation: Yamaha-frame bike with scuba tank makes Dyson shortlist (2012, November 6) retrieved 18 August 2019 from https://phys.org/news/2012-11-yamaha-frame-bike-scuba-tank-dyson.html © 2012 Phys.org New design for motorcycle engines powered by compressed aircenter_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. Explore further As some suggest, however, the idea is wonderful but not yet practical. The drawback is lack of refilling stations, and a need to find power to compress the air in the first place. While gas stations are available to provide compressed air, they would not be efficient for something like a scuba tank. The answer would be in a “distributed generation smart grid,” he said, where refill stations can be positioned around a city or rural area to facilitate the required range. The refill points would be navigable via the user’s integrated smartphone and GPS system. Air energy could be compressed via solar or wind and stored in an inert state forever. Right now, however, the O2 Pursuit is a project that provides an inviting look into the use of air as an alternative fuel in, as he said, a post-petroleum world.last_img read more

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A practical synthesis for benzazetidine compounds

first_img Citation: A practical synthesis for benzazetidine compounds (2016, August 18) retrieved 18 August 2019 from https://phys.org/news/2016-08-synthesis-benzazetidine-compounds.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. © 2016 Phys.org Explore further Palladium-catalyzed C-H activation of primary amino alcohols More information: Gang He et al. Benzazetidine synthesis via palladium-catalysed intramolecular C−H amination, Nature Chemistry (2016). DOI: 10.1038/nchem.2585AbstractSmall-sized N-heterocycles are important structures in organic synthesis and medicinal chemistry. Palladium-catalysed intramolecular aminations of the C−H bonds of unfunctionalized amine precursors have recently emerged as an attractive new method for N-heterocycle synthesis. However, the way to control the reactivity of high-valent Pd intermediates to form the desired C−N cyclized products selectively remains poorly addressed. Herein we report a strategy to control the reductive elimination (RE) pathways in high-valent Pd catalysis and apply this strategy to achieve the synthesis of highly strained four-membered benzazetidines via the Pd-catalysed intramolecular C−H amination of N-benzyl picolinamides. These reactions represent the first practical synthetic method for benzazetidines and enable access to a range of complex benzazetidines from easily obtainable starting materials. The use of a newly designed phenyliodonium dimethylmalonate reagent is critical, as oxidation of Pd(II) palladacycles with this reagent favours a kinetically controlled C−N RE pathway to give strained ring-closed products.center_img Credit: Gang He, Gang Lu, Zhengwei Guo, Peng Liu, and Gong Chen Journal information: Nature Chemistry A group of researchers from Nankai University in China, the University of Pittsburgh, and The Pennsylvania State University have demonstrated, for the first time, a synthetic mechanism for N-unsubstituted benzazetidines that is high yielding and practical. Their synthetic strategy can be used to make a variety of benzazetidine-based compounds for possible drug design exploration. Their work appears in Nature Chemistry.Researchers have made headway in nitrogen-based heterocycle chemistry using a palladium-catalyzed intramolecular dehydrogenative C-H amination (IDCA) reaction. In this reaction, the oxidized palladium catalyst coordinates to the target carbon and the amine. Ideally, this would result in a reductive elimination reaction in which the palladium is reduced back to its original oxidation state and the dehydrogenated carbon and amine would form a ring-closing bond.However, in practice, this reaction is difficult to accomplish in high yields. Four-membered rings are hindered due to ring strain. This leads to side products that are more thermodynamically favored than forming the four-membered ring. Gang He, Gang Lu, Zhengwei Guo, Peng Liu, and Gong Chen have devised a synthetic scheme that results in the desired benzazetidine using N-benzyl-picolinamide (PAs) as the reactant and Pd(OAc)2 as the catalyst. Key to the success of their synthetic scheme is rigid ligand structures both from the N-benzyl-picolinamide and the oxidant.They developed the phenyl-iodonium dimethylmalonate (PhI(DMM)) as their oxidant after seeing that PhI(OAc)2, which is known to promote C-H acetoxylation using similar starting materials, formed a small amount of their target benzazetidine. However, the C-N ring closing reaction is thermodynamically unfavored compared to forming a C-OAc bond. After looking at computational studies to see how they could prevent the carbon-oxygen bond from forming, they decided to tether the oxygen on the carbonyl of the acetate to prevent it from reacting with the target carbon atom for the reductive elimination. After trying several tethers, they landed upon PhI(DMM), which proved to enhance the yield of the desired benzazetidine (48%).The next step was to see if this reaction was generalizable by changing the R group on the N-benzyl picolinamide reactant. Even in cases where the benzazetidine product could be formed using PhI(OAc)2, He, et al. saw better yields with PhI(DMM). Furthermore, their reaction worked with a variety of functional groups, although, interestingly, did not work for unsubstituted benzylamine. An additional advantage of their scheme is that the PA protecting group was easily removed with sodium hydroxide in methanol, THF, and water at room temperature. He, et al. conducted mechanistic studies in hopes of understanding the reaction better so that it may be optimized for later research,. They found that the transition state involves a bimetallic Pd(III)/Pd(III) complex instead of a monomeric Pd(IV) compound. It is this bimetallic complex with the PhI(DMM) tether that promotes the desired reductive elimination pathway and blocks the C-OAc bond from forming. This research opens the door to the possibility of finding pharmaceuticals that involve a benzazetidine. This synthetic mechanism is versatile for various functional groups and, using the PhI(DMM) oxidizing agent, produces product yields that make this reaction pathway significantly more practical than the limited reaction mechanisms that were previously used to make benzazetidines. (Phys.org)—A key chemical component to antibiotics, such as penicillin is the beta-lactam, a four-membered amide ring that is fused to another heterocycle. Researchers in drug design would like to explore compounds using a similar structure. One avenue may be found in the four-member azetidine ring. Similar to the beta-lactam ring, it is a four-membered amine heterocycle. However, less progress has been made for benzazetidines, an azetidine fused to a benzene ring, due to the significant ring strain in these four-membered scaffolds.last_img read more

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Heat things up

first_imgThings have changed for a modern bride and girlfriend, you need much more than basic lingerie. Women in India are a lot bolder today than they used to be, and are more open to expressing their desires. You need throw in some variety in lingerie, and it should be a mix of comfort and sensuality, with a combination of assorted colors, as these inner little things would help you sail through your wedding and honeymoon or just any other special night.  Also Read – ‘Playing Jojo was emotionally exhausting’We bring you the some must have lingerie products you need to have in your wedding trousseau or your lingerie wardrobe to heat things up- Silicon Bras: The modern day bride takes fabulous care of her figure before her wedding days. And to flaunt that, she opts for designer wardrobe which includes, backless cholis , halter neck gowns, off shoulder dresses. For such dresses, it’s important to remember that opting for the wrong style of lingerie can kill your dress and spoil your overall look. To avoid that, you must buy a silicon bra, it would keep you free from the tension of visible straps and you will get the desired lift. Price range – Rs 699  to Rs 799 Also Read – Leslie doing new comedy special with NetflixSexy Nightwear: Along with all other lingerie, you must keep a sexy and naughty one piece nightwears in your lingerie collection. It must be beautiful and sensuous enough for the wedding night. You can opt for satin and lace lingerie in red, black, maroon and purple for nightwear. Price range – Rs 1499 to Rs 1999Role Play Costumes: These days, couples get to know each other well before the wedding, and are very much aware of each other’s likes, dislikes and fantasies. Surprise your partner with a role playing costumes you think he would love to see you in. In the case of new couples, role playing adds that element of fun to mask possible discomfort that each partner would feel in the bedroom. It helps set the mood for your relationship. A mood we are sure would be much appreciated by both partners. Though the thought may not be extremely new, but the availability used to be a constraint. The availability has only sprung in the last few years, and you can get a costume of your choice easily. Price range – Rs 699  to Rs 2999.last_img read more

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The budding talents

first_imgA group show is going to be held in the Capital that brings together the artworks of six young artistes from across the country who have recently completed their studies. The show titled Peers 2014 is presented by Khoj International Artists’ Association. The participants are –  Amshu MS, Diptej Vernekar, Dheer Kaku, Ragini Bhow, Sanket Jadia and Sangita Maity. For Peers 2014, all the artists were chosen after a rigorous selection by a jury consisting of artists Vishal Dar, Zuleikha Chaudhari, Arunkumar HG and Khoj director Pooja Sood. Also Read – ‘Playing Jojo was emotionally exhausting’The show is the eleventh edition of the Peers Residency which is an annual education and outreach residency programme of four weeks, where these young and talented artists shed the expectations and rigidity of a structured curriculum, work together in a discursive space that stresses the role of free experimentation and risk-taking in art practice. Sood, director, Khoj said, ‘Peers Residency programme provides recent graduates and masters’ students opportunity for exchange and dialogue. It aims to provide young artists a forum for experimentation and interaction with the larger creative community, and also hopes to create a network of students from various art, architecture, media and design colleges. Through the programme, we aim to give young artists the tools and space to actively experiment within their practice and also hope to give them a forum for interaction with established practicing artists and creative practitioners’.Where: Khoj Studios, Khirkee ExtensionWhen: 19 – 22 JuneTiming: 11 am – 7 pmlast_img read more

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Screening for all

first_imgOver the past six decades, Sangeet Natak Akademi has built up an archive of audio and video tapes, photographs, slides and films on the performing arts. Documentary films in the archive have been screened for the general and specialised audiences from time to time. In 2005, an initiative was taken to exhibit the films on a regular basis. The first fortnightly screening was held on 24 June 2005 at the Sahitya Akademi Auditorium, New Delhi. Two films on Ustad Allauddin Khan and Ustad Bade Ghulam Ali Khan, both directed by Hari Das Gupta were shown on that occasion. Also Read – ‘Playing Jojo was emotionally exhausting’Sanchayan is a new initiative of the Akademi to share its collections with those who relish the performing arts through the screening of video recordings. Sanchayan’s first series of films were screened between 14 February – 19 May 2014, and included – performing art forms of Lakshadweep,  Adhe Adhure, Mand Mahotsava, Ang Tarang: Mayurbhanj Chhau, Chhayanatak, Sankirtana and Chhau. Some of the screenings concluded with an interaction between the artists featured in the film and the audience.  The next show that you wouldn’t want to miss would be Flying Crane and Antim Adhyay choreograohed by Narendra Sharma. To give you a top up on the shows, here’s a quick synopsis. Also Read – Leslie doing new comedy special with NetflixFlying Crane is a tribute to the migrating Siberian cranes visiting our land yearly after covering long distances — a continuous beautiful event of nature. Inspiration has been also drawn from Tagore’s poem written in 1916 in Kashmir. Antim Adhyaya (The Last Chapter) Visual images of the episodes and situation of life till man becomes the victim of the end – Death. He dares death with his courage but finally has to accept it. The episodes follow one after the other as follows: The Last Journey, Mourning Women, Death as Ritual, Victim of Speed, Death in Emotional Triangle, Man and Machine, Conquering Death and the finale – Last Journey of Fulfilled Man based on one of the last poems of Rabindranath Tagore – In front lies the ocean of peace….Flying Crane & Antim Adhyay: 26 July, 4 pmKallol (Play in Bengali) : 9 August, 4 pmlast_img read more

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Mamata to unveil strategy for next LS polls in TMC rally

first_imgKolkata: All roads in the city will today lead to Esplanade, the venue of the TMC’s annual Martyrs’ Day rally, where West Bengal Chief Minister Mamata Banerjee is likely to spell out the party’s strategy for the next Lok Sabha polls. The TMC observes the Martyrs’ Day every year on July 21 in its bid to pay homage to 13 Youth Congress workers, allegedly killed in police firing in 1993 during the Left Front regime in West Bengal. Banerjee was a leader of the Youth Congress at that time. Also Read – Rain batters Kolkata, cripples normal life “Today, we will get the directive from our supremo for the Lok Sabha polls next year. We will also give a befitting reply to allegations made by BJP leaders during Narendra Modi’s (Midnapore) rally,” a senior TMC leader said. The rally also comes a day after the no-confidence motion against the Modi government was decisively defeated. Banerjee had earlier said her party was supporting the motion against the BJP government at the Centre in the greater interest of the Opposition unity, and the TMC had issued a whip to its Lok Sabha MPs, asking them to be present in the House yesterday. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killed TMC workers and people from across the state started gathering in the metropolis since midnight to attend the public meeting to be held near Victoria House at Esplanade. The rally is of immense importance given the party’s ambition to play a major role after the next Lok Sabha polls, political observers said. It is also likely to see the joining of Congress MLAs and senior leaders from other parties. “We will take the pledge at the July 21 rally to oust the BJP in 2019. The country will definitely get the opportunity to see Chief Minister Mamata Banerjee’s developmental work nationwide after 2019,” TMC MP Abhishek Banerjee had recently said. The MP, along with senior TMC leaders, had visited the venue in the heart of the city yesterday and oversaw preparations for the rally. Around 6,000 police personnel will be deployed for the rally, a senior officer of the Kolkata Police said. Besides, close to 100 CCTVs have been installed in and around the area to keep a close watch on the proceedings, including hidden cameras near and underneath the dais of the rally to foil any “sabotage” attempt, he said. According to senior TMC leaders, the party’s aim to play a major role at the national-level can only be successful if it manages to bag the maximum number of seats out of the 42 Lok Sabha seats in West Bengal. The party presently has 34 Lok Sabha seats from West Bengal. With nearly 40 of the 42 Lok Sabha seats in the state being located in villages and semi-urban areas, the party is hoping to cash in on its stupendous performance in the May panchayat polls, where it managed to win all the zilla parishads and nearly 80 per cent of the gram panchayat seats.last_img read more

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State PWD takes measures to rid underconstruction sites of dengue threat

first_imgKolkata: The state Public Works Department (PWD) has initiated taking measures to check breeding of mosquitoes at the under-construction sites.Directions have been given to all the executive engineers of the state PWD posted at different locations to take necessary measures in this connection.It came to the notice of the concerned officials that accumulated water at under-construction sites turn to breeding grounds for mosquitoes. Hence, the step has been taken to control vector-borne diseases. Also Read – Rain batters Kolkata, cripples normal lifeIt may be mentioned that Rajiva Sinha, Additional Chief Secretary of the Health and Family Welfare department, wrote to the Principal Secretary of the state PWD, Arnab Roy, on August 17 in connection with the matter related to “prevention of dengue vector at construction sites”.Subsequently, the state PWD directed its executive engineers, who are in-charges of under-construction sites, to take necessary measures on an immediate basis “without fail”. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedIn the letter from the state Health department to the state PWD, it was mentioned that “you may be aware that rainy season between July to October is the active breeding time for vector-borne diseases including dengue. It is noticed that often under-construction sites are major breeding grounds of the dengue vector that is Aedes Aegypti.” It was also suggested that the executive engineers might hold meetings with the agencies carrying out the work at different sites for sensitisation on reduction and control of dengue vector at respective construction sites. The agencies have to keep the construction sites clean and at the same time, there should be daily monitoring to avoid accumulation of water. The Health department has also suggested: “if accumulation of water is unavoidable, larvicidal may be sprayed on weekly basis. If required, basis orientation on vector control may be given by health officials to engineers and agencies for implementing the vector control protocol.”The executive engineers have also started taking necessary steps soon after getting the direction and would also hold meetings with the agencies, wherever necessary, to avoid accumulation of water at the construction sites.It may be mentioned that Chief Minister Mamata Banerjee held several meetings with the concerned officials to check vector-borne diseases. She had directed to take pro-active steps in checking the same. Besides the concerned departments, all other civic bodies are directed to take necessary measures for the same in their respective areas.last_img read more

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12yearold to appear for Madhyamik 2019

first_imgKolkata: Madhyamik 2019 will witness an unprecedented event when a 12-year-old girl from Howrah will be sit for the secondary examination.Saifa Khatun, who had never been to school, will be appearing for the examination as an external candidate at 12 years of age. Saifa had sat for the eligibility test conducted by West Bengal Board of Secondary Education (WBBSE) and scored 52 percent marks. “She had successfully passed through our eligibility test for the external candidate. She will be appearing for Madhyamik 2019 in that category,” said Kalyanmoy Ganguly, president of WBBSE. Also Read – Rain batters Kolkata, cripples normal lifeIt may be mentioned that both regular and external candidates can appear for Madhyamik examination. The names of the regular candidates are provided by the respective schools, while the external candidates have to clear a test conducted by WBBSE. If they score well in that examination they are allowed to appear for the examination. Sources at WBBSE said Saifa’s father had applied to the Board in the month of February, a few days before this year’s examination mentioning her daughter’s desire to sit for the examination. However, the date of such application had already elapsed at that time so the Board advised her father to apply afresh later. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killed”The fresh application came in the month of June and it was in August when she sat for the Board’s test. It has been found that the girl, who had never been to school, scored 52 percent marks,” the source said. The girl from Amta in Uluberia has scored 42 in English, 48 in Bengali, 40 in Mathematics, 58 in Physical Science, 68 in Life Science, 56 in History and 60 in Geography. A senior Board official, however, recollected a similar incident some years back. “At least in the last five to six years, there has not been a single case on similar lines,” the official added.last_img read more

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Limiting childrens choice of toys can fuel stereotypes

first_imgWhile buying toys, parents and grandparents should consider the child’s interests, not their gender because limiting choice of toys according to gender can fuel stereotypes, suggests new research.Clues to the continued dominance of men in the STEM (science, technology, engineering, and mathematics) fields- and the reason nurturing often comes more easily to women- can be found in the children’s toy department, said sociologist Elizabeth Sweet from California State University, Sacramento, US. Also Read – Add new books to your shelf“When we wall off the toys that develop spatial skills or are devoted to science and say, ‘These are only for boys,’ and we wall off the toys that develop empathy and verbal skills and say, ‘These are only for girls,’ it severely limits how children develop,” Sweet said in a university statement.“If kids aren’t exposed to the kinds of toys and play that help them develop those skills, they may not be as good at them over time. But even more insidious is that it reinforces the stereotype that boys are good at science and math, and girls are not. It pushes women and girls out of that field, because they think it’s not for them,” she explained. Also Read – Over 2 hours screen time daily will make your kids impulsiveSweet believes that making STEM toys pink, as proposed by some toy manufacturers, would not help much.“I think that plays up the stereotype that girls are so different that they need a special kind of STEM toys,” noted.“Research shows that different kinds of toys help children to develop different kinds of skills, for instance, building blocks are great for building spatial skills. Playing with dolls is really good for developing language skills.” she added.last_img read more

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