Archive for "August, 2019"

Kondo effect in single magnetic molecules

Posted in tnljfllg on August 31st, 2019

first_imgThe Kondo effect was first explained more than 40 years ago by a Japanese physicist. It opened a new chapter in the study of fundamental physics. Now, that door is being pushed open a little further, thanks to the efforts of a team of physicists at the Institute for Theoretical Physics in Aachen, Germany. Their paper, published May 17th in Physical Review Letters, is titled “Quantum-Tunneling-Induced Kondo Effect in Single Molecular Magnets,” and it offers possibilities for the further study of molecular transport. Citation: Kondo effect in single magnetic molecules (2006, June 7) retrieved 18 August 2019 from https://phys.org/news/2006-06-kondo-effect-magnetic-molecules.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.center_img “The Kondo effect is known from a variety of systems,” explains Walter Hofstetter, one of the authors of the paper. “However, this is the first time that it has been predicted in a magnetic molecule.” Hofstetter and his colleagues believe this discovery can be used to create a device that can be used as a spectroscopy tool that can be used to take various measurements on a quantum level.Jun Kondo found that as the temperature approaches 0 K, the electrical resistance of an atom will be anomalously enhanced. This is known as the Kondo effect, and it represents the first known example of a situation in physics known as asymptotic freedom. Asymptotic freedom is demonstrated by coupling that, at low energies and temperatures, become non-perturbatively strong. “Until now,” Hofstetter tells PhysOrg.com, “the assumption was that this effect didn’t take place in magnetic molecules.”Hofstetter and his peers have turned that assumption in its head. “There is an interplay between two effects of magnetic anisotropy in magnetic molecules, of which the first one is indeed detrimental to the Kondo effect. Using basic methods, we calculate the temperatures for the Kondo effect to show up. The new thing we discovered was that the second effect of anisotropy, the famous quantum tunneling of the molecular magnet, completely restores, and even enhances, the Kondo effect.” “The other interesting note about this process,” Hofstetter notes, “is that the electrons involved will behave as though they have only two spin states. This is remarkable because the spin would be, in actuality, much greater. In some case the spin would be greater than 10. But even with so many spin states it behaves as if it has a spin of 1/2.”Hofstetter says that there are “lots of practical applications in the future. The main value of this discovery is that it is a very good way to get information about molecular transport.” He and his colleagues have shown in more recent calculations that the discovery could lead to a spectroscopy tool that could find magnetic states.“With such a spectroscopy tool,” Hofstetter explains, “You could characterize better, and get more information. It is an important first step in eventually building other devices.” He goes on to point out that when it comes to building devices of such small dimensions, such that they operate on the quantum level, a tool that can help measure such small particles is quite useful. And Hofstetter and his collaborators aren’t the only scientists who think so. He says that there are already physicists working on electron transport experiments that could make use of this discovery when it comes to analyzing the characteristics and states of magnetic molecules.“Trapping molecules is a big challenge,” Hofstetter says. “There are few that have done it. So any tool that could help experimentalists understand the molecules that they do have better would be helpful.”By Miranda Marquit, Copyright 2006 PhysOrg.com. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.last_img read more

Researchers develop algorithm to maximize friendship acceptance by strangers on social networks

Posted in hqpxmowc on August 31st, 2019

first_imgThe running example. Credit: arXiv:1302.7025 Journal information: arXiv Social network sites work based on the concept of one person sending a friend request to another. If the request is accepted, the two become “friends” which means they gain access to each other’s privately posted information. Quite often, one person wishes to become “friends” with someone else on the network that they don’t know—a celebrity perhaps, or a person of influence in business. Sending a friend request to such a person generally fails, however, because the person getting the request doesn’t have any reason to accept. Celebrities rarely if ever accept friend requests from people they don’t know, for example, if they did, their friend list would become unmanageable, not to mention useless—the idea behind a friend list is to keep in touch with friends, after all.But still, sometimes it would be beneficial to somehow manipulate a stranger into accepting a friend request by fooling them into believing that there are mutual acquaintances. Unfortunately, social networks don’t offer a way to make that happen. In this new effort, the research team has devised a way to do it, by creating an algorithm that offers the names of people to friend to create an eventual pathway to the intended target. As more and more of these friends accept friend requests, (because they appear to be in the same social circle), it becomes more and more likely that the actual intended target will accept a friend request as it appears to them that they and the requester have many common friends, and thus exist in the same social circle.There is one caveat here, and that is the algorithm only works if implemented by the social network itself because they are the only ones that can analyze the structure of friend relationships between different individuals who don’t know each other or have any friends in common. There is also the problem of figuring out why a social network such as Facebook would ever possibly want to add such a feature. It would seem contrary to their most basic philosophy—to allow “friends” to keep in touch. Explore further Citation: Researchers develop algorithm to maximize friendship acceptance by strangers on social networks (2013, March 6) retrieved 18 August 2019 from https://phys.org/news/2013-03-algorithm-maximize-friendship-strangers-social.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.center_img (Phys.org) —A small team of computer scientists from Taiwan, the U.S. and China has developed an algorithm that aids a desire to manipulate an unknown social network user into accepting a friend request. The idea, as they describe in their paper they’ve uploaded to the preprint server arXiv, is to offer intelligent suggestions of other people to friend to create a mutual social circle of friends, which will increase the odds of the ultimate target agreeing to a friend request. © 2013 Phys.org How well do you know your friends? More information: Maximizing Acceptance Probability for Active Friending in On-Line Social Networks, arXiv:1302.7025 [cs.SI] arxiv.org/abs/1302.7025AbstractFriending recommendation has successfully contributed to the explosive growth of on-line social networks. Most friending recommendation services today aim to support passive friending, where a user passively selects friending targets from the recommended candidates. In this paper, we advocate recommendation support for active friending, where a user actively specifies a friending target. To the best of our knowledge, a recommendation designed to provide guidance for a user to systematically approach his friending target, has not been explored in existing on-line social networking services. To maximize the probability that the friending target would accept an invitation from the user, we formulate a new optimization problem, namely, emph{Acceptance Probability Maximization (APM)}, and develop a polynomial time algorithm, called emph{Selective Invitation with Tree and In-Node Aggregation (SITINA)}, to find the optimal solution. We implement an active friending service with SITINA in Facebook to validate our idea. Our user study and experimental results manifest that SITINA outperforms manual selection and the baseline approach in solution quality efficiently.via Arxiv Bloglast_img read more

Researchers build selfassembling multicopter distributed flight array w Video

Posted in uwvmwtei on August 31st, 2019

first_img The point of the craft is to help students learn to understand distributed networks using a hands-on approach. To date, the team at ETH has built two such devices with two different means of communication, but the basic configuration remains the same. A number of individual copters, each shaped like a hexagon, roll around on a flat surface and eventually hook up in a random fashion with some or all of the others in the vicinity. After a moment of communication, each of the copters starts its rotor and the craft rises into the air and hovers, maintaining its balance. After another moment, the individual copters stop their rotors and the craft falls to the ground, breaking apart into individual copters again. Thus far the research group, which is made up of professors and students, acknowledges that the DFA doesn’t really serve any purpose other than as a teaching aid, but it does hold a certain beauty as the individual bots work together to achieve what none of them can alone.Each individual copter has inertial sensors that monitor tilt and roll and a processor that converts the sensor data to spin speed of its rotor. By itself, it’s incapable of flight—torque causes it to crash immediately upon takeoff. To offset torque, half of the copters in the multi-copter craft spin their rotors in the opposite direction of the other half. QFO Labs wants to send palm-sized copters out to play Researchers at ETH Zurich, a technical University in Switzerland, have developed a unique type of copter. It’s made of several single rotor craft that physically connect to one another autonomously to create a larger multiple rotor craft. Because the craft is self-assembled, each time it takes flight, it has a different configuration. The researchers call their craft a Distributed Flight Array (DFA). One test unit has the individual copters communicating via infrared signaling, the other through metal pins on the sides of bots. Also, one group has latches to allow the copters to physically connect to one another, the other magnets. Both configurations rely on a distributed network to operate, which means that there is no central control. Each of the copters monitors itself and makes adjustments as it sees fit. The end result is a multi-configuration craft that is able to lift itself off the ground and hover (keeping itself level) in the air and then return to Earth, with very minimal input (joystick control to keep the craft from wandering away) from its human operators. More information: www.idsc.ethz.ch/Research_DAndrea/DFA Explore furthercenter_img While the DFA itself might not be commercialized, concepts learned by students who helped create it will almost certainly be applied some day, helping to create multifaceted robots carrying out yet to be imagined missions. © 2013 Phys.org Citation: Researchers build self-assembling multi-copter distributed flight array (w/ Video) (2013, July 23) retrieved 18 August 2019 from https://phys.org/news/2013-07-self-assembling-multi-copter-flight-array-video.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

Assessing scientific research by citation wake detects Nobel laureates papers

Posted in iphgegfl on August 31st, 2019

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. In their study, the researchers analyzed all papers in the Physical Review database, dating back more than a century. In their method, each paper receives a wake citation score. A paper’s wake consists of all papers that that have cited it, either directly or indirectly. Since a paper can receive citations only from papers published at a later date, these papers form a “wake” of that paper as viewed on a graph. All papers in a paper’s wake are then assigned to neighborhood layers according to the length of the shortest path to the paper (similar to the concept of degrees of separation). In terms of idea propagation, the shortest path can also be viewed as the minimal number of processing steps of an idea. Finally, the paper’s wake citation score is computed as a weighted sum of the total number of papers in each layer. A detrending factor accounts for the fact that, the earlier a paper is published, the more papers there are in the future that could potentially cite it. A dilution factor can also be applied to restrict the number of layers considered, from only direct citations to the full wake of citations.The resulting wake citation scores yield a ranking of papers that is very different than a list of papers ranked by number of citations. As the results show, 9 out of the top 10 papers ranked by wake citation score are only moderately cited (the exception is the #1 ranked paper, “Theory of Superconductivity” by Bardeen, Cooper, and Schrieffer). The other papers show a very high ratio between the direct-citation-rank and the wake-citation-rank. For example, the paper ranked #2 according to wake citation score (“The Radiation Theories of Tomonaga, Schwinger, and Feynman” by F. Dyson) has a ratio of 707.5, indicating a direct-citation-rank of merely 1,415. Among the top 100 papers ranked by wake citation score, 86 show a ratio higher than 10.As for which ranking method is “better,” there is of course no objective measure of importance; otherwise, that would be the only measure needed. But considering the widely accepted scientific quality of Nobel Prize research, Klosik and Bornholdt have checked their top-ranked papers that have been coauthored by Nobel Prize laureates. They found that 18 of the top 25 and more than half of the top 100 papers have contributions from a Nobel Prize laureate. In contrast, the ranking by direct citation count yields Nobel author contributions in just 4 of the top 25 and 25 of the top 100 papers. (Overall, the ranking by direct citation in the Physical Review database is dominated by papers on density-functional theory.)Besides comparing to the direct citation ranking, the researchers also compared the wake citation ranking to one of the more elaborate measures of rank, which is Google’s PageRank algorithm. They found that the top papers according to PageRank contain more Nobel laureate coauthors than in the direct citation rank, but fewer than in the wake citation rank. One of the biggest differences between PageRank and wake citation is that PageRank counts weighted paths (the connections between papers) while wake citation counts weighted nodes (the papers themselves). While the wake citation method currently applies only to papers, Klosik and Bornholdt plan to extend the measure to scientists in the future.”We are currently exploring the wake citation score as an impact measure for scientists,” Bornholdt said. “This could provide a more balanced ranking of scientists from different fields.” The 10 top-ranked publications according to the wake citation score with dilution parameter chosen to be 0.9 (where 1.0 means the whole wake is considered). Nobel Prize laureates are labelled with an asterisk. The second column shows the fraction of the ranks assigned to the paper according to the number of direct citations and the wake citation score, respectively. Credit: © Klosik, Bornholdt (CC by 4.0) Journal information: PLoS ONE International collaborations produce more influential science, analysis finds (Phys.org)—Ranking scientific papers in order of importance is an inherently subjective task, yet that doesn’t keep researchers from trying to develop quantitative assessments. In a new paper, scientists have proposed a new measure of assessment that is based on the “citation wake” of a paper, which encompasses the direct citations and weighted indirect citations received by the paper. The new method attempts to focus on the propagation of ideas rather than credit distribution, and succeeds by at least one significant measure: a large fraction (72%) of its top-ranked papers are coauthored by Nobel Prize laureates. “Our wake citation score is less sensitive to the size of the research community of a paper than other existing measures, as we do not focus on the direct citation count of a paper,” Bornholdt told Phys.org. “What makes our wake citation score unique is our focus on whether a paper ‘started something,’ by estimating its ‘word of mouth dynamics’ from the subsequent citation network.” Ph.D. student David F. Klosik and Dr. Stefan Bornholdt at the University of Bremen have published their paper on the citation wake measure of publications in a recent issue of PLOS ONE.As Klosik and Bornholdt explain, scientists’ practice of citing the work that influenced them in the reference list of their own publications offers a wealth of data on the structure and progress of science. The difficulty lies in interpreting the data, which is often a controversial process. The first paper citation network was developed in the 1960s, and early analysis was based almost exclusively on counting a paper’s number of direct citations. This method has formed the basis of several newer quantitative methods of assessment, such as the h-index, which attempts to measure the impact of individual researchers, and the Thomson Scientific Journal Impact Factor, which ranks the relative importance of journals. However, it’s well-known that measures based on citation count have several shortcomings. For one thing, a paper’s ranking strongly depends on the citation habits and size of the paper’s field. Further, newer papers have fewer citations simply because they have not been around long enough to receive as many citations as older papers. On the other hand, the citation count may underestimate the impact of very old yet groundbreaking publications, since once seminal results become textbook knowledge, the original papers are often no longer cited. More recently, newer methods (such as CiteRank, SARA, and Eigenfactor) have addressed some of these drawbacks by accounting for factors other than direct citations. While they have made improvements, these methods generally view the citation network primarily as one of credit diffusion.Klosik and Bornholdt’s new measure differs in that it views the citation network as a picture of idea propagation, in which the ideas within a paper influence future research far beyond the citations the paper receives directly. © 2014 Phys.org The wake scores of all papers in the Physical Review citation base from 1892 to 2009. The dashed line shows the maximal wake size at a given publication date. The “ridge” formed by the data indicates cross-references between scientific subfields. Credit: © Klosik, Bornholdt (CC by 4.0) Explore further More information: David F. Klosik and Stefan Bornholdt. “The Citation Wake of Publications Detects Nobel Laureates’ Papers.” PLOS ONE. DOI: 10.1371/journal.pone.0113184 Citation: Assessing scientific research by ‘citation wake’ detects Nobel laureates’ papers (2014, December 12) retrieved 18 August 2019 from https://phys.org/news/2014-12-scientific-citation-nobel-laureates-papers.htmllast_img read more

Understanding reef systems at the genetic level

Posted in yemiwbag on August 31st, 2019

first_img More information: “The genome of Aiptasia, a sea anemone model for coral symbiosis.” PNAS 2015 ; published ahead of print August 31, 2015, DOI: 10.1073/pnas.1513318112AbstractThe most diverse marine ecosystems, coral reefs, depend upon a functional symbiosis between a cnidarian animal host (the coral) and intracellular photosynthetic dinoflagellate algae. The molecular and cellular mechanisms underlying this endosymbiosis are not well understood, in part because of the difficulties of experimental work with corals. The small sea anemone Aiptasia provides a tractable laboratory model for investigating these mechanisms. Here we report on the assembly and analysis of the Aiptasia genome, which will provide a foundation for future studies and has revealed several features that may be key to understanding the evolution and function of the endosymbiosis. These features include genomic rearrangements and taxonomically restricted genes that may be functionally related to the symbiosis, aspects of host dependence on alga-derived nutrients, a novel and expanded cnidarian-specific family of putative pattern-recognition receptors that might be involved in the animal–algal interactions, and extensive lineage-specific horizontal gene transfer. Extensive integration of genes of prokaryotic origin, including genes for antimicrobial peptides, presumably reflects an intimate association of the animal–algal pair also with its prokaryotic microbiome. 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. Citation: Understanding reef systems at the genetic level (2015, September 8) retrieved 18 August 2019 from https://phys.org/news/2015-09-reef-genetic.html Researchers have been seeking an experimentally versatile model of the cellular biology underlying this symbiosis, which could be a key to understanding the adaptability and resilience of reef systems. An international group of researchers now reports in the Proceedings of the National Academy of Sciences on a genetic study of the sea anemone Aiptasia, a globally distributed species that harbors Symbiodinium, the most widespread known group of endosymbiotic dinoflagellates, which inhabit many species and are common to cnidarians that occupy nutrient-poor waters.The host provides the algae with a sheltered environment and the nutrients necessary for photosynthesis and growth; in return, Symbiodinium supplies over 90 percent of the cnidarian’s total energy. The reasons this holobiont provides an attractive model system for reef studies include polyp sizes convenient for experimentation, and its easy production in a laboratory environment, where it can reproduce asexually, yielding large clonal populations. It can also be maintained indefinitely in an aposymbiotic state (without its endosymbiote) and reinfected with a variety of Symbiodium strains.The researchers sequenced the DNA from Aiptasia anemones and produced a reference transcriptome, which was sequenced using RNA derived from different developmental and symbiotic states. They uncovered a number of previously unknown genetic features of Aiptasia, but more importantly, the study provides a foundation for understanding the evolution and function of the symbiosis between the two organisms. Among their discoveries, the researchers found a novel cnidarian-specific family of putative pattern-recognition receptors that may be involved in the symbiotic relationship. Cnidarian hosts must necessarily distinguish among potential symbionts, and most can establish relationships with some strains of Symbiodinium but not with others. “Such discriminations must be accomplished in the absence of an adaptive immune system and presumably depend on innate immunity mechanisms that involve the recognition of microbial cell-surface molecules by host pattern-recognition receptors,” the authors write. The study’s findings support the hypothesis that invertebrate pattern-recognition capabilities are more flexible than previously assumed.They also document evidence for horizontal gene transfer (HGT) between the hosts and the symbiotic dinoflagellates. Given that the associations between the two organisms have evolved over millions of years, HGT is extremely likely to have occurred. The researchers found 275 HGT candidate genes specific to Aiptasia, plus another 548 candidates believed to have been transferred from a nonmetazoan source to a basal cnidarian in the evolutionary past and shared among a large number of cnidarians. The researchers conclude that the variety of conserved features found in their analysis should help to illuminate the evolution of many kinds of symbiotic anthozoans, not just Aiptasia-Symbiodinium holobionts, thus enhancing knowledge of reef systems, among the most important marine ecosystems. Journal information: Proceedings of the National Academy of Sciences (Phys.org)—Coral reefs are the most diverse marine ecosystems, biodiversity hotspots now under anthropogenic threat from climate change, ocean acidification and pollution. Efforts are underway to protect and expand shrinking reef systems, but such endeavors are inhibited by the lack of information about such fundamental features as the functional symbiosis between the cnidarian coral animal and the photosynthetic alga that live in its gastrodermal cells.center_img © 2015 Phys.org Aiptasia sp. Credit: Wikipedia/CC BY-SA 3.0 Caribbean coral findings may influence Barrier Reef studies Explore furtherlast_img read more

Physicists investigate erasing information at zero energy cost

Posted in mzibuqwe on August 31st, 2019

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. Scientists show how to erase information without using energy Credit: CC0 Public Domain Scientists have only recently investigated these fluctuations in the context of the Landauer principle, where they found that these fluctuations are quickly suppressed by something called the Jarzynski equality. This means that heat energy fluctuations have only a very tiny probability of violating the Landauer principle. In the new study, the scientists have for the first time investigated the corresponding discrete fluctuations that arise when erasing information using spin.Among their results, the researchers found that the discrete fluctuations are suppressed even more quickly than predicted by the corresponding Jarzynski equality for “spinlabor”—a new term the scientists devised that means the spin equivalent of work. This is the first evidence of beating this bound in an information erasure context. The quick suppression means that the fluctuations have an extremely low probability of using less than the minimal cost required to erase information using spin, as given by the Vaccaro-Barnett bound, which is the spin equivalent of the Landauer principle.”Our work generalizes fluctuation relations for erasure using arbitrary conserved quantities and exposes the role of discreteness in the context of erasure,” Bedkihal told Phys.org. “We also obtained a probability of violation bound that is tighter than the corresponding Jarzynski bound. This is a statistically significant result.”The scientists also point out that this process of erasing information with spin has already been experimentally demonstrated, although it appears to have gone unnoticed. In spin-exchange optical pumping, light is used to excite electrons in an atom to a higher energy level. For the electrons to return to their lower energy level during the relaxation process, atoms and nuclei collide with each other and exchange spins. This entropy-decreasing process can be considered analogous to erasing information at a cost of spin exchange.Overall, the new results reveal insight into the thermodynamics of spin and could also guide the development of future applications. These could include new kinds of heat engines and information processing devices based on erasure that use inexpensive, locally available resources such as spin angular momentum. The researchers plan to further pursue these possibilities in the future. “The erasure mechanism can be used to design generalized heat engines operating under the reservoirs of multiple conserved quantities such as a thermal reservoir and a spin reservoir,” Bedkihal said. “For example, one may design heat engines using semiconductor quantum dot systems where lattice vibrations constitute a thermal reservoir and nuclear spins constitute a polarized spin reservoir. Such heat engines go beyond the traditional Carnot heat engine that operates under two thermal reservoirs.” Explore further Citation: Physicists investigate erasing information at zero energy cost (2017, February 22) retrieved 18 August 2019 from https://phys.org/news/2017-02-physicists-erasing-energy.html More information: Toshio Croucher, Salil Bedkihal, and Joan A. Vaccaro. “Discrete Fluctuations in Memory Erasure without Energy Cost.” Physical Review Letters. DOI: 10.1103/PhysRevLett.118.060602, Also at arXiv:1604.05795 [quant-ph] Investigating this idea further, physicists Toshio Croucher, Salil Bedkihal, and Joan A. Vaccaro at the Centre for Quantum Dynamics, Griffith University, Brisbane, Queensland, Australia, have now discovered some interesting results about the tiny fluctuations in the spin cost of erasing information. The work could lead to the development of new types of heat engines and information processing devices.As the scientists explain in a new paper published in Physical Review Letters, the possibility that information can be erased at zero energy cost is surprising at first due to the fact that energy and entropy are so closely related in thermodynamics. In the context of information, information erasure corresponds to entropy erasure (or a decrease in entropy) and therefore requires a minimum amount of energy, which is determined by Landauer’s erasure principle.Since Landauer’s erasure principle is equivalent to the second law of thermodynamics, the zero-energy erasure scheme using arbitrary conserved quantities can be thought of as a generalized second law of thermodynamics. This idea dates back to at least 1957, when E. T. Jaynes proposed an alternative to the second law in which heat energy is thought of in a more general way than usual, so that heat incorporates other kinds of conserved quantities. Applying this framework to information erasure, in 2011 Vaccaro and Stephen Barnett showed that the energy cost of information erasure can be substituted with one or more different conserved quantities—specifically, spin angular momentum.One important difference between heat energy and spin angular momentum is that, while heat may or may not be quantized, spin angular momentum is an intrinsically quantum mechanical property, and so it is always quantized. This has implications when it comes to accounting for tiny fluctuations in these quantities that become significant when designing systems at the nanoscale. Journal information: Physical Review Letters © 2017 Phys.org (Phys.org)—A few years ago, physicists showed that it’s possible to erase information without using any energy, in contrast to the assumption at the time that erasing information must require energy. Instead, the scientists showed that the cost of erasure could be paid in terms of an arbitrary physical quantity such as spin angular momentum—suggesting that heat energy is not the only conserved quantity in thermodynamics.last_img read more

Surgeon General Sounds Alarm On Risk Of Mariju

Posted in bacbbpks on August 31st, 2019

first_imgSurgeon General Sounds Alarm On Risk Of Marijuana Addiction… Jane Khomi by NPR News Allison Aubrey 8.29.19 2:01pm At a time when more than 30 states and the District of Columbia have legalized the use of marijuana for either medical or recreational use, the U.S. surgeon general says no amount of the drug is safe for teens, young adults and pregnant women.”While the perceived harm of marijuana is decreasing, the scary truth is that the actual potential for harm is increasing,” Surgeon General Jerome Adams said Thursday during a press conference to announce the new advisory.Surveys show that an increasing number of adolescents and pregnant women use the drug, which can be eaten, smoked or vaped. But the surgeon general told NPR in an interview that many people are not aware of just how potent the drug can be.”This is not your mother’s marijuana,” he said. The THC concentration in marijuana plants has increased threefold between 1995 and 2014, according to the report, and concentrated products can contain up to 75% THC.”The higher the THC delivery, the higher the risk,” Adams said.Young people who regularly use marijuana are “more likely to show a decline in IQ and school performance [and] are more apt to miss classes,” Adams said. And frequent use of the drug can also impair a child’s attention, memory and decision-making.In addition, it can be habit-forming. “Nearly 1 in 5 people who begin marijuana use during adolescence become addicted,” Adams said. “That’s scary to me as the dad of a 15-, a 13- and a 9-year-old.”Symptoms of marijuana dependency include “irritability, mood and sleep difficulties, decreased appetite, cravings, restlessness, and/or various forms of physical discomfort that peak within the first week after quitting and last up to 2 weeks,” according to the National Institute on Drug Abuse. And marijuana becomes addictive “when the person cannot stop using the drug even though it interferes with many aspects of his or her life,” according to NIDA.Health and Human Services Secretary Alex Azar announced that President Trump is donating part of his salary this quarter — about $100,000 — to fund a digital media campaign to bring attention to the risks of marijuana use.There’s still a lot that’s unknown about the risks of marijuana, and federal officials say they support more local and federal research. Just this week, the Drug Enforcement Administration said it would start to process pending applications for permission to cultivate the plant for research, as NPR reported. The Trump administration is not the first to sound the alarm about the rising use of marijuana. At a time when surveys point to a significant increase in the number of pregnant women using the drug, the American College of Obstetricians and Gynecologists is educating women about the risks. “Marijuana and pregnancy don’t mix,” the group urges. The organization published an infographic that points to the range of risks for women and their fetuses, including disruption of brain development, smaller birth weight, higher risk of premature birth, and behavioral problems in childhood.Bottom line, the surgeon general wants to remind people that despite what’s happening in states, federal law hasn’t changed. And there is good reason for caution.Copyright 2019 NPR. To see more, visit NPR.last_img read more

Celebrating the art of photography

Posted in jnroxoco on August 31st, 2019

first_imgBeginning from 5 March, the festival incorporates eight cities which includes Delhi, Mumbai, Ahmadabad, Bangalore, Hyderabad, Goa, Kolkata and Trivandrum. Aimed at showcasing the multi-faceted nature of French culture through unique Indo-French co-productions, the festival will be held for a month.The festival endeavours to reach out to the audience by taking photography out of traditional spaces such as museums and galleries and showcase them in public spaces to change the relationship between people and their city. Delhi will witness Connaught Place being transformed into an art gallery with life size projections on the facades of inner circle, along with magical projections at the bus stops, subways to increase social inclusion. The idea is to explore all avenues to bring together amateur and professional photographers and photography enthusiasts. Also Read – ‘Playing Jojo was emotionally exhausting’Some highlights will include a mobile photo booth that will be showcased in Delhi TBC where Anay Mann, an expert photographer, will use backdrops of famous French places and venues. Other attractions of the festival will include the water screen image projections, a unique music tribute to India, photography exhibitions across several themes like urban living and Pablo Bartholomew’s World of Indian Cinema.WHEN: 5 March onwardsWHERE: Around Connaught Placelast_img read more

Fakir of the French opera

Posted in nezyezlq on August 31st, 2019

first_imgInternationally-acclaimed SAMUDRA dance group performed a Ballet Segment in an excerpt from the French opera The Fakir of Benares, presented as part of the 10th anniversary celebrations of The Neemrana Music Foundation, on December 5 and 6, at the Jawaharlal Nehru Stadium in New Delhi.The Foundation’s anniversary gala, co-presented by the European Union, celebrates a decade of opera in India. The Fakir of Benares (2003) was the first opera ever performed in Delhi. Samudra performed a segment of the opera at the time and they have been invited again to be a part of it. Also Read – ‘Playing Jojo was emotionally exhausting’Madhu Gopinath and Vakkom Sajeev, the incredibly brilliant Choreographers, Directors and Principal Dancers of Samudra who have performed  in 48 countries – which includes an applause-winning performance at  The Royal Opera House, London, are going to present a  mesmerising show  at the Neemrana Festival. They also choreographed sequences for the opening and closing ceremonies of The 2010 Commonwealth Games in New Delhi.Madhu and Sajeev founded Samudra in 1998 and have since been training dancers in the new style and touring the world with their original choreographic productions. Also Read – Leslie doing new comedy special with NetflixA French opera by playwright Leo Manuel, The Fakir of Benares, was a massive hit when it was first staged in Paris in 1922. The opera’s exotic Indian milieu, the grandiose sets and costumes, the beautiful music and powerful performances made it one of the most successful shows of its time.But the glory of the opera lasted only a short while, as a massive fire destroyed most of the costumes and sets, and the complete score was lost during the Second World War. The opera was largely forgotten until 2002, when Priya Wacziarg, a soprano, came upon the score of the opera in a bookshop in Paris. It took them a while to put together an orchestra and a choir. In 2003, the first production of The Fakir of Benares in 80 years was ready for the stage. Famous director Muzaffar Ali undertook to do the stage direction, after a French conductor recomposed the missing orchestral parts. Muzaffar Ali lent the quintessentially French opera a genuine Indian touch by incorporating two ballets rooted in Indian classical dance. Samudra, was chosen to perform one of these.The Neemrana Music Foundation, established in New Delhi by Priya’s father, the late Francis Wacziarg, has produced nine operas over a decade.last_img read more

Bengal seeks additional forces from other states for Panchayat polls

Posted in nezyezlq on August 31st, 2019

first_imgKolkata: Four or five other neighbouring states have been contacted for additional forces to be deployed at all the polling premises for the state Panchayat polls on May 14, state Director General of Police Surajit Kar Purkayastha said on Friday.He claimed that the state has made adequate security arrangements for conducting the rural polls in a single phase. Purkayastha held a press conference at Nabanna on Friday where he stated that elections should be allowed to take place peacefully. He appealed to everyone and sought their cooperation regarding the same. Also Read – Heavy rain hits traffic, flights”The security arrangements for the Panchayat polls are adequate. There will be armed coverage in all the polling premises,” Purkayastha told reporters here.Stating that the state police are having sufficient capacity, Purkayatha said: “Manpower in the state police has gone up and the strength of the police has also increased.”It may be mentioned that there are 58,467 booths in 43,067 polling premises in 20 districts across the state and all the premises will be brought under the coverage of the armed forces. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedThe Calcutta High Court sought a detailed report on security arrangements for poll personnel. The court directed Anuj Sharma ADG (Law and Order) to submit the report by May 4.A PIL has been filed with the High Court demanding compensation of Rs 10 lakh in case of death of a poll personnel and Rs 5 lakh for getting injured. In this connection, the court also wanted to know the steps that have been taken for the security of the polling personnel. The state in this connection submitted that they are taking all necessary steps for security of the polling personnel. The court has given directions to give it in writing. Meanwhile, the State Election Commission (SEC) convened a meeting of 10 political parties to discuss the poll process. The Calcutta High Court had also directed the SEC to conduct the elections after holding discussions with all the stakeholders.On Thursday, the State Election Commission announced the poll date stating that the election will be held on a single day (May 14) and the post-poll scrutiny will be held on May 15 and if needed, repolling will be conducted on May 16. Though the date for counting of votes is yet to be announced, the state government has written to the SEC urging to do the same on May 17.The state government has declared a holiday in 20 districts on May 13, 14 and 15 where the elections will be held.The elections were earlier slated to be held in three phases on May 1, 3 and 5 but the schedule was pushed back after the Calcutta High Court stayed the polling process on petitions moved by the Opposition parties, who complained that they were not allowed to file nominations allegedly by armed miscreants owing allegiance to the ruling Trinamool Congress.last_img read more