Group develops wearable, stretchable memory device for monitoring heart rate Citation: Stretchable Silicon May Inspire a New Wave of Electronics (2007, June 13) retrieved 18 August 2019 from https://phys.org/news/2007-06-stretchable-silicon-electronics.html “Electronics that are bendable have many potential applications, but reversible stretchability is a different and much more technically challenging characteristic,” said corresponding researcher John Rogers, a materials scientist at the University of Illinois at Urbana-Champaign (UIUC), to PhysOrg.com.Rogers and colleagues from UIUC and the University of Arizona created an ultra-thin silicon membrane from a silicon wafer and merged the membrane with a slab of a silicon-based polymer. The overall process involved several steps but, in short, the group first “pre-strained” the polymer slab, pulling it taut, before they topped it with the prepared silicon. When they released the strain the silicon buckled, resulting in a series of raised wavy ridges forming a herringbone-like pattern. The finished composite membrane is about 100 nanometers thick and can stretch biaxially – that is, in both the vertical and horizontal directions.The group performed several stretching tests on the membrane by pulling it from various directions. Stretching it horizontally caused the herringbone pattern to straighten out. Stretching along the diagonal produced similar changes until, at full stretch, straight diagonal ridges formed. And stretching along the vertical direction – perpendicular to the waves – produced straight vertical ridges. In each case, the membrane recovered its original pattern when the strain was released. These temporary stretching-induced structural changes occur primarily at the membrane’s central region. In its pre-stretched state, the herringbone pattern is far less pronounced at the membrane’s edges. There, the waves give way to fairly straight ridges, and thus the edge of the membrane does not have the elasticity of the central region. However, Rogers and his colleagues say that this could be an asset in certain applications. For example, a medical imaging system that is stretchable – able to conform to the contours of the human body to achieve more detailed images – might perform better if regions directly above the device’s photodetectors (which collect light reflecting from the object being imaged) are kept flat.In their paper describing the work, in the May 8 online edition of Nano Letters, Rogers and his colleagues also discuss theoretical predictions of the membrane’s behavior. They note that these predictions match their experimental observations, specifically in terms of the shape and dimensions of the waves. This theoretical component of the research, performed by UIUC scientist Young Huang, a co-author of the paper, is a significant result of their work.Rogers and his group have previously produced structures with similar qualities: stretchy, ridged nanoribbons made of silicon and gallium arsenide. Other research groups have made circuit components consisting of stretchable metal wires connecting rigid islands. However, the nanoribbons are only stretchable lengthwise and the wire-island structures provide circuit-level stretchability rather than stretchable devices.Citation: Won Mook Choi, Jizhou Song, Dahl-Young Khang, Hanqing Jiang, Yonggang Y. Huang, and John A. Rogers. “Biaxially Stretchable ‘Wavy’ Silicon Nanomembranes” Nano Lett., ASAP Article 10.1021/nl0706244 S1530-6984(07)00624-8Copyright 2007 PhysOrg.com. All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com. 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 Images of the stretchable silicon membrane (a,b,c) The membrane in the relaxed state before stretching in the horizontal, diagonal, and vertical directions, respectively (d,e,f) The membrane during stretching in these directions (g,h,i) The membrane at full stretch. Credit: John Rogers Scientists have created a form of nanoscale silicon that is stretchable. The new material may help pave the way for a class of stretchable electronic devices, such as “smart” surgical gloves and personal health monitors, that are not possible to create using current technology and materials.
Different views of artificial graphene. Image credit: L. Nádvorník, et al. ©2012 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft Explore further Citation: Scientists take steps toward creating artificial graphene (2012, May 29) retrieved 18 August 2019 from https://phys.org/news/2012-05-scientists-artificial-graphene.html More information: L. Nádvorník, et al. “From laterally modulated two-dimensional electron gas towards artificial graphene.” New Journal of Physics 14 (2012) 053002. DOI: 10.1088/1367-2630/14/5/053002 (Phys.org) — Researchers first observed graphene in 2004 by extracting the single-atom-thick sheets of carbon from bulk graphite. While graphene’s electrical and optical properties have proven to have extraordinary potential for many applications, creating atomically precise structures out of graphene remains challenging. In an effort to improve graphene’s usability, scientists have been searching for a way to fabricate artificial graphene, which could serve as a helpful structure where devices can be easily tested before their implementation with natural graphene. Now in a new study, scientists have identified all the main criteria required to make artificial graphene, which could provide a guide for experimentally realizing the material. Nano-factory promises great things for graphene science 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. The team of scientists, from institutions in the Czech Republic, France, Canada, and the US, has published their paper on creating artificial graphene in a recent issue of the New Journal of Physics.“The appealing concept of artificial graphene appeared soon after ‘real’ graphene was fabricated,” coauthor Lukas Nádvorník of Charles University and the Institute of Physics, ASCR, both in Prague, Czech Republic, told Phys.org. “This concept suggests taking advantage of high-quality two-dimensional semiconductors, which are nowadays routinely available, and to fabricate on their basis a new crystal with an ‘artificially’ created honeycomb lattice, typical of graphene. In other words, to use current technologies to mimic nature.”Although researchers have been trying to fabricate artificial graphene for the past few years, no one has yet succeeded. Here, by identifying all the most important requirements, the scientists hope to change that.“For the first time, we were able to extract all the parameters relevant for artificial graphene and suggest their proper combination, which should lead to successful realization of this system,” said coauthor Milan Orlita of Charles University, the Institute of Physics, ASCR, and the Laboratoire National des Champs Magnétiques Intenses in Grenoble, France. “This is useful for our further work, but also other groups working in this field might profit out of this. Our work does not represent a real milestone in artificial graphene; nevertheless, we believe that an important step towards its fabrication has been made.”The researchers added that experimentally fabricating artificial graphene in the future will be challenging, but feasible.“We do not see any principal obstacles preventing fabrication of artificial graphene – but technologically, it is rather tricky issue,” said coauthor Karel Výborný of the Institute of Physics, ASCR, and the University of Buffalo-SUNY in Buffalo, New York. “One has to find a proper combination of a number of fine parameters such as the carrier density, strength of modulation potential, lattice constant, etc. Our work is probably the first one that approaches the problem systematically and compares quantitatively the experimental results with the criteria formulated theoretically.” Artificial graphene has certain advantages over natural graphene, such as a crystal structure whose form can be varied. As the researchers explained, the crystal structure of natural graphene is fixed: it consists of a perfect honeycomb lattice with a carbon-to-carbon distance of 0.142 nanometers. In contrast, artificial graphene prepared from semiconductor multilayers (for example, by means of electron beam lithography) is not restricted by a precise lattice form or a precise lattice constant. “It is also relatively easy to fabricate specific ‘devices,’ i.e., artificial graphene shaped into stripes, junctions, etc.,” Nádvorník said. “With natural graphene, it is difficult (although not impossible!) to create atomically precise structures. One could test such ‘devices’ first with artificial graphene and, if they prove useful, attempt to reproduce them with natural graphene.”Nádvorník explained that researchers have long been trying to create various kinds of artificial crystals in order to explore their quantum mechanics, but what makes graphene unique is the behavior of its electrons, called Dirac fermions.“Fabrication of two-dimensional superlattices with lattice constants around 100 nanometers (less than one hundredth of the thickness of a human hair), of which artificial graphene is an example, dates back to the 1990s,” he said. “What was not noticed in those times were the Dirac fermions – a special feature of artificial graphene. In our work, we clearly state four criteria that one has to fulfill in order to observe the Dirac fermions in a man-made semiconductor structure. Roughly speaking, while the race has been in place since 2009 to observe some manifestation of the Dirac fermions in artificial graphene, we show how to test the individual criteria separately. When all of the criteria are fulfilled, we can hope to observe the Dirac fermions.”He explained that the Dirac fermions not only make graphene what it is, but also provide insight into other areas of physics.“It is just the hexagonal symmetry which is responsible for the appearance of Dirac fermions,” Nádvorník said. “These are electrons which move in (artificial) graphene crystals with vanishing effective mass. They closely resemble ultra-relativistic particles and their motion can be, perhaps surprisingly, described using equations typical of relativistic physics. Dirac fermions in graphene (it doesn’t matter whether it is artificial or real graphene) thus interconnects solid-state physics and relativistic quantum electrodynamics, two very different branches of modern physics.”In the future, the researchers plan to take the next steps toward experimentally realizing artificial graphene.“It is one of the conclusions of our work that a viable way to create artificial graphene is to further reduce the lattice constant (periodicity of the applied potential) down to tens of nanometers,” Nádvorník said. “To achieve this, we plan to apply the electron beam lithography with even higher resolutions as we used up to now, or take advantage of the focused-ion beam technology. We hope that we will be able to provide evidence for Dirac fermions in artificial graphene using a broad range of experimental technique available (infrared/THz or visible spectroscopy or electronic transport).” Journal information: New Journal of Physics Copyright 2012 Phys.Org 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.
In the present work, Gong et al. proposed the SMART system to precisely extract encoded OAM states from multiply scattered light. The scientists first employed the technique with a speckle-correlation scattering matrix to recover the optical field of a data-carrying vortex beam. The light contained OAM superposition states and the SMART system demultiplexed every OAM channel using the mode decomposition method. To test the validity of the system, the scientists built an optical wireless data transmission system in a multiple scattering environment. Notably, the SMART system showed good tolerance to system misalignment and permitted non-line-of-sight (NLOS) connection for use in optical communication. After being subject to multiple scattering, the data carrying vortex beam generated a random speckle pattern, which was recorded by a camera and then analyzed using the SMART system. To experimentally validate the system, Gong et al. constructed an optical data transmission link based on a digital micromirror device (DMD). The setup contained a He-Ne laser as the source of light and a beam expander with a specified magnification, to tune the size of the laser beam. The scientists installed high-speed mode switching in the system to acquire images synchronously, which was also used to execute digitized calculations in the SMART platform. The scientists used an optical diffuser to mimic an optically scattering environment in the experiment, which they inserted in the path of transmission. Gong et al. then introduced a technique developed via parallel wavefront optimization for rapid reference-free calibration within the same setup. High-capacity optical communication can be accomplished by multiplexing multiple light-carrying orbital angular momentum (OAM) channels. However, in turbulent environments, optical scattering and ‘speckle patterns’ occur due to ambient, atmospheric microparticles and significantly decrease the orthogonality between OAM channels, demultiplexing (extracting information) and increasing crosstalk during communication. In a recent study now published in Light: Science & Applications, Lei Gong and co-workers at the departments of optics and optical engineering, medical engineering, electrical engineering and physical sciences in China and the USA developed a ‘scattering-matrix-assisted retrieval technique’ (SMART) to efficiently recover scattered data from multiplexed OAM channels. In the study, they used 24 OAM channels in parallel, passing through a scattering medium to demultiplex the channels from the scattered optical fields and achieve minimal experimental crosstalk approximating -13.8 dB. Explore further Experimental setup and characterization of the SMART platform. a Experimental setup of the SMART platform. b–d Field retrieval of a known incident field. For a given LG superposition field (x; (b)), a raw intensity speckle with a single shot (y*y; (c)) is recorded. The retrieved field (x’; (d)) is achieved by using the SMART. The symbols A and φ denote the amplitude and phase of the fields, respectively. e A comparison between the measured OAM spectrum by the SMART and the theoretical spectrum. Credit: Light: Science & Applications, doi: https://doi.org/10.1038/s41377-019-0140-3. The scientists decoded the information of multiple twisting light beams that passed through scattered media containing atmospheric microparticles (causing reduced image quality) and retrieved high quality data from the multiplexed OAM channels instead. The SMART platform allowed high-fidelity transmission of images and reduced the error rate by 21 times compared with previous studies. Gong et al. envision the optimized technique will facilitate high quality optical data transfer in harsh atmospheric conditions or underwater for practical applications. The scientists implemented the experimental setup in a self-built data transmission system, by employing a digital micromirror device (DMD) to encode OAM channels. They simultaneously provided high-tolerance to misalignment in the setup through reference-free calibration. They then successfully demonstrated the high-fidelity transmission of gray and color images under scattering conditions, at an error rate of <0.08 percent. The technique can pave the way to high performance optical communication in turbulent environments. Light is a carrier of information during communication and scientists have traditionally aimed to enhance its information-carrying capacity and spectral efficiency by multiplexing the wavelength, polarization and spatial degree of freedom for improved data communication. The OAM of light, recognized by Les Allen in 1992, is considered a promising degree of freedom to multiplex data in free space and optical fibers at the nanoscale. A light beam carrying an OAM is characterized by a helical wave front, is superior to spin angular momentum with two states, and offers unlimited channels for data transmission. As a result of its unique properties, OAM multiplexing is widely applied to achieve high capacity communication in free space and optical fibers. When light propagates through scattering media or multimode systems, well-known speckle patterns can arise from self-interference of multiply scrambled light. While the speckle patterns differ from the incident light, the encoded information is retained in the speckles and never lost. In fact, speckle patterns depend on the temporal and spatial properties of incident light to extract and use information within the speckles. © 2019 Science X Network a Gray-level encoding scheme using 8-OAM multiplexing for transferring grayscale images. b Theoretical and experimental OAM spectra of the gray level 111. c Example of sent and received grayscale images (Rubik’s Cube, 100 × 100 pixels) in a data transmission experiment. The Rubik’s Cube® was used with the permission of Rubik’s Brand Ltd (www.rubiks.com). An error rate of 0 was achieved for this image transmission. d The relative error RMSE/PK of all gray levels contained in the picture in (c). e RGB encoding scheme using 24-OAM multiplexing, applied to color images. f, g The corresponding results for optical transfer of a color image of a Rubik’s Cube. An error rate of 0.08% was achieved for the color image data transfer. h The relative error RMSE/PK of all colors contained in the picture in (g) Credit: Light: Science & Applications, doi: https://doi.org/10.1038/s41377-019-0140-3. After reducing the potential for crosstalk in the experimental setup, the scientists measured the level of crosstalk at -13.8 dB in the system, acceptable for practical applications. The technique showed good tolerance and immunity to misalignment, indicating that the SMART platform was robust for practical implementation and advantageous for SMART data transfer. To transfer optical data under scattering, Gong et al. used a digital method and encoded the binary data carried in multiplexed OAM states into a single laser beam. During data transfer, the scientists allowed information encoding by directly generating a light field that represented the OAM superposition state. For example, a grayscale picture with 256 gray levels was represented with a binary digital byte with 8 bits; where every bit took a value from 0-1. To encode the byte, the scientists used an OAM superposition state containing 8 OAM bases, where each correlated with one bit. For instance, the gray level of 111 has the binary byte of '01101111' in the OAM spectrum. Using simple criteria derived in the study, the scientists showed the OAM spectrum retrieved with the SMART platform was in good agreement with the theoretical result. By following the experimental strategy developed in the work, Gong et al. transferred a gray picture (Rubik's cube) across a scattering medium. Experimentally, the scientists received the transferred picture with an error rate of zero; defined as the ratio of incorrect pixels in the decoded image to all pixels of the image, indicating that all pixels in the image were perfectly transferred. The scientists attributed the high performance to the low error of every OAM channel in the retrieved spectrum. The concept of SMART-enabled OAM-multiplexed transmission across scattering channels. Information is encoded into an orbital angular momentum (OAM) superposition state of light. A data-carrying vortex beam propagates across scattering channels. At the receiver, the SMART method retrieves the original field from the scattered random speckles and completes OAM demultiplexing from the retrieved field. On this basis, the data carried by light can be extracted from the reconstructed OAM spectrum. Credit: Light: Science & Applications, doi: https://doi.org/10.1038/s41377-019-0140-3. a, b) The real (blue circles) and imaginary parts (green squares) of the measured OAM coefficients with an ln-dependent phase ϕ(ln)=πln/24+ϕ0, with preset phase shifts of ϕ0 = 0 (a) and π (b). The theoretical data are plotted as blue and red lines. c, d The corresponding phase difference (diff.) Δϕ(ln) between the calculated phase ϕ(ln) plotted as a function of ln. Linear fitting (solid lines) to the phase difference is calculated. The error bars are calculated as the standard error of 20 measurements. Credit: Light: Science & Applications, doi: https://doi.org/10.1038/s41377-019-0140-3. Journal information: Light: Science & Applications Citation: Recovering scattered data from twisted light via ‘scattering-matrix-assisted retrieval technique (SMART)’ (2019, March 14) retrieved 18 August 2019 from https://phys.org/news/2019-03-recovering-scattering-matrix-assisted-technique-smart.html Measured orthogonality relationship between the scattered OAM states. a The measured coincidence between OAM states with their topological charges from ln = –12 to ln = 12 at an interval of 1. The maximum crosstalk is −9.4 dB. b The measured coincidence for another OAM base (ln = –24, –22, ···, 24) with a state interval of 2. The maximum crosstalk is –13.8 dB. Credit: Light: Science & Applications, doi: https://doi.org/10.1038/s41377-019-0140-3 More information: 1. Optical orbital-angular-momentum-multiplexed data transmission under high scattering www.nature.com/articles/s41377-019-0140-3 Lei Gong et al. 06 March 2019, Light: Science & Applications.2. Parallel wavefront optimization method for focusing light through random scattering media www.osapublishing.org/ol/abstr … .cfm?uri=ol-36-6-870 Meng Cui, 2011, Optics Letters, OSA Publishing.3. Controlling waves in space and time for imaging and focusing in complex media www.nature.com/articles/nphoton.2012.88 Allard P. Mosk et al. May 2012, Nature Photonics. , Nature Photonics , Optics Letters To transfer a color image, Gong et al. employed a superposition state of 24 OAM components to encode the data. The scientists verified the experimental and theoretical transmission of data, while indicating that the platform behaved well for data transmission. Based on these results, the scientists transferred a color image of Rubik’s cube with an error rate of 0.08 percent, higher than before but promising lower error in data transmission. In addition to binary digital data transfer, the scientists showed that the SMART platform had great potential for complex spectral analyses and the measurement of phase.In this way, Gong et al. introduced a SMART platform for data retrieval, which when compared with previous OAM-demultiplexed systems offered two key advantages by: 1. Employing a digital method to identify each OAM channel. 2. Recovering the OAM superposition state from highly scattered speckles and then demultiplexing each OAM channel for data retrieval. 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. Unlocking the untapped potential of light in optical communications Limits of the method included the necessity for pre-calibration and data processing, which were experimentally time consuming. The OAM-based data transmission operated across a distance of 3 meters in a laboratory environment, the scientists conducted data analysis on a personal computer. For long distance transmission, they propose using a higher power laser, a larger aperture collecting lens and good alignment in the optical system to improve the signal to noise ratio (SNR). The proposed SMART prototype can be further optimized prior to practical applications. The technique will offer opportunities for high-performance optical wireless communication under scattering conditions, multimode fiber-optic communication and harsh underwater optical communication. The results will also benefit OAM-based quantum communication, high-dimensional quantum key distribution, quantum encryption and quantum memory for efficient data transfer in turbulent environments.
Journal information: Science Advances Citation: Using El Niño and Antarctic Oscillation data to predict air pollution levels in northern India (2019, July 18) retrieved 18 August 2019 from https://phys.org/news/2019-07-el-nio-antarctic-oscillation-air.html In recent years, northern India has experienced poor air quality, particularly in the winter months, to the extent that the country has some of the worst air quality in the world—surpassing even China. Researchers have also noted that in some years, pollution levels seem worse than normal due to weather conditions. In this new effort, the researchers looked at two natural weather events that are known to have a clear impact on winter weather in northern India—El Niño and the Antarctic Oscillation.El Niño is, of course, an event that involves a large band of warm water forming in the Pacific Ocean—such events have widespread weather impacts across multiple parts of the world. And the Antarctic Oscillation is a wind event caused by a low-pressure belt forming over Antarctica.To better understand what impact either or both weather events might have on India’s air pollution, the researchers collected data on both, covering the years 2003 to 2018. They then used the data to conduct statistical modeling as a way to assess their impacts on northern India. They report that El Niño events tend to result in reduced wind speeds in the region, which prevented airborne pollutants from moving out of heavily populated areas. They also found that Antarctic Oscillation events create stronger winds in some parts of northern India and weaken them in others, resulting in uneven impacts on pollution levels.The researchers suggest that it is possible to use weather data collected for El Niño and Antarctic Oscillation events to provide government officials with a means of gauging pollution levels in northern India each year. Another El Niño on the horizon? A schematic diagram of the influence of El Niño and AAO on the wintertime haze in North India. Credit: Meng Gao More information: Meng Gao et al. Seasonal prediction of Indian wintertime aerosol pollution using the ocean memory effect, Science Advances (2019). DOI: 10.1126/sciadv.aav4157 Explore further A team of researchers affiliated with several institutions in China and the U.S. has found that data from El Niño and Antarctic Oscillation events can be used to predict air pollution levels in northern India. In their paper published in the journal Science Advances, the group describes their study of the historical impact of El Niño and Antarctic Oscillation events on weather in northern India and what they found. © 2019 Science X Network 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.
Happening for the second time in India, K-Pop Festivals have been quiet a rage in many countries and receive tremendous response from its fans and followers world-wide, especially in Korea. Korean Cultural Centre organised the semi-finals of the 2nd K-Pop Festival Contest India 2013 at FICCI auditorium. 12 semi-finalists performed on 17 August enthralling an audience of over 700.Kim Kum-pyoung, the Director of Korean Cultural Centre addressed the audience saying he was thrilled at the response received this year for the contest and will try to make it even bigger next year by inviting K-pop stars from Korea. Crazy Freaks Dance Crew (Dance Cover), were declared the winners of the contest in India will get to travel to Korea for Gangwon World K-Pop Festival 2013. Edwin Jamir was declared as the winner in the song cover and is recommended as candidates for the Changwon K-POP World Festival. Also Read – ‘Playing Jojo was emotionally exhausting’The preliminary round of the competition received a record response of 80 entries, which is a remarkable jump from last year’s 30 entries. The entries are expected to gain a steep rise again in the following years to come, especially, when K-Pop is gaining fast popularity among Indian audiences. With Psy’s Gangnam Style going viral last year, the Korean Pop Music and Dance moves have gained international recognition and has given many their favorite dance moves of the year. Also Read – Leslie doing new comedy special with NetflixJoon-gyu Lee, Ambassador of the Republic of Korea said, ‘As you all are sitting here enjoying the Korean songs and dance moves, people in Korea are probably watching the latest Bollywood release – Chennai Express. Hence, it is only through cultural activities that we can communicate with each other better and try to understand both the cultures and K-Pop contest is just another way of communicating between two different cultures.’K-Pop Festival is an initiative of South Korea’s Ministry of Foreign Affairs to popularise the Korean Pop Culture.
The show which will reflect his evolution as an artist will commence on 14 December and will continue till 15 January 2014.The canvases are a unique and appealing juxtaposition between abstraction & realism. The female form always been dominant in his subject is mysterious and surreal. The confident strokes evoke an emotion in the viewer. As it’s art always evokes a reaction and response.His forte being his relationship series has been taken to another platform in this exhibition. His canvases have a saga to narrate. It is up to the viewer to read it according to his/her perspective. Also Read – ‘Playing Jojo was emotionally exhausting’The greatest possibility of Asit Kumar Patnaik’s work emerges out of his productive equivocation.There are distinct ways in which this new series of Patnaik’s work, Enchanting Relations, is a departure form of deepening and widening of some of the silent concerns informing his aesthetic project. It is best to clarify this apparent oxymoron – productive equivocation – especially since equivocation is often misunderstood as an obstacle to productivity. Also Read – Leslie doing new comedy special with NetflixThe appeal of Patnaik’s craft is embodied in his deft negotiations between, and across, several binaries – figurative and abstract, man and woman, background and foreground, lines and colors, singular and plural. In that sense, Patnaik’s work resonates with the increasing propensity among critics and popular audience alike to warm up to the potential of ambivalent sensibilities. For quite some time now, it has rose among connoisseurs of art and literature, indeed of culture as a whole, a welcome discomfort with binaries and a corresponding openness to ambivalence.When: From 14 December 2013 till 15 January 2014Where: Chawla Art Gallery, Square One Mall, Saket, New Delhi
Arab League chief Nabil al-Arabi, on the eve of a regional summit in Egypt, declared his full support for the strikes against the Huthis who he said had carried out a “coup” in Yemen.The rebels and their allies had been closing in on main southern city Aden, where President Abedrabbo Mansour Hadi has been holed up since fleeing the rebel-controlled capital Sanaa last month. Their advance raised Saudi fears that the Shiite minority rebels would seize control of the whole of its Sunni-majority neighbour and take it into the orbit of Shiite Iran. Also Read – Pro-Govt supporters rally as Hong Kong’s divisions deepenTehran condemned the Saudi-led intervention as “a dangerous step” that violated “international responsibilities and national sovereignty”. Huge explosions were heard in Sanaa as warplanes pounded an air base adjacent to the international airport and other locations, an AFP correspondent reported.At least 14 civilians were killed when seven homes near the air base were reduced to rubble, a civil defence source said.The International Committee of the Red Cross warned that “ordinary Yemenis — already hit hard by years of conflict — are now enduring the effects of this escalation”. At daybreak hundreds of Sanaa families streamed out of the capital seeking the relative safety of the provinces.
Kolkata: A 15-year-old boy who sustained critical injuries while trying to take a selfie with a speeding train in the background on Friday died at the hospital on early Saturday morning. The incident occurred near Noada Station in East Burdwan district when a speeding goods train hit him.The railway police said the victim, identified as Biswajit Midhha, was standing on a railway track in an attempt to take a selfie with an Express train passing through another track in the background. He could not see the approaching goods train on that track. Also Read – Rain batters Kolkata, cripples normal lifeRailway police claimed that the motorman of the goods train blew the horn but he failed to draw the attention of the boy who had been extremely engrossed in his mobile phone trying to take the selfie. The accident took place on Friday when the victim was returning home in Budbud from Noada where he went to one of his relative’s houses on the occasion of Laxmi Puja on Wednesday. When he was entering Noada Station on Friday, he found that Up Santiniketan Express was passing through the area. He took out his mobile phone and started clicking selfies while standing on another track. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedA speeding goods train suddenly came on the track and hit him. Midhha fell at a distance due to the impact of the accident. Some locals rushed him to Burdwan Medical College and Hospital where he succumbed to his injuries on early Saturday morning. He originally hailed from Pakur in Jharkhand and used to stay at his uncle’s house at Budbud in East Burdwan. Bengal has reported several selfie-related deaths in the past few months. Friday’s incident is just the latest in a string of deadly accidents involving selfies in the state. Despite various awareness campaigns carried out both by the Railways and the state government, such incidents are rampant as selfies have become some sort of an addiction for many youngsters. A few months ago, a youth was killed while taking a selfie at Memari in the same district. “Witnesses told us that he was on the edge of the platform when he was trying to take his selfie and was hit by a goods train. More youngsters have a propensity to take selfies with a running train in the background as a result of which accidents often have taken place,” a railway police officer said. The railway police have started a detailed probe into the incident.
Aiming for a weekend getaway? Do not chalk out events, it may spoil the fun as it may seem like another work. According to researchers, scheduling a leisure activity like seeing a movie or taking a coffee break at a specific time led people to anticipate less enjoyment and actually enjoy the event less than if the same activities were unplanned.“People associate schedules with work. We want our leisure time to be free-flowing,” said Selin Malkoc, Assistant Professor at the Ohio State University in the US. Also Read – Add new books to your shelfHowever, that does not mean one should not plan at all. The research showed that roughly planning an event (but not giving a specific time) led to similar levels of enjoyment as unplanned events. “Time is supposed to fly when you’re having fun. Anything that limits and constrains our leisure chips away at the enjoyment,” Malkoc added. In the study, the team analysed 13 separate studies that looked at how scheduling leisure activities affects the way we think about and experience them. Also Read – Over 2 hours screen time daily will make your kids impulsiveIn one study, college students were given a calendar filled with classes and extracurricular activities and asked to imagine that this was their actual schedule for the week.Half of the participants were then asked to make plans to get frozen yogurt with a friend two days in advance and add the activity to their calendar. The other half imagined running into a friend and deciding to get frozen yogurt immediately.Results showed that those who scheduled getting frozen yogurt with their friend rated the activity as feeling more like a “commitment” and “chore” than those who imagined the impromptu get-together.“If you schedule leisure activities only roughly, the negative effects of scheduling disappear,” Malkoc said.“People don’t want to put time restrictions of any kind on otherwise free-flowing leisure activities,” she noted, in the paper published in the Journal of Marketing Research.
Kolkata: The Netaji Subhas Chandra Bose International (NSCBI) Airport has entered Level 1 Mapping of the Airport Carbon Accreditation Programme after it successfully met the necessary requirements.Airports Council International (ACI), an organisation representing the world’s airports, announced that NSCBI Airport has successfully completed the first step towards carbon mapping. The airport has achieved a significant milestone through its sustained efforts in using clean and green energy for its day-to-day operations. Its ground mounted grid connected solar plant had been commissioned last year. Also Read – Rain batters Kolkata, cripples normal lifeThe 15 MW plant, capacity wise one of the largest among all the AAI airports across the country, has successfully been able to reduce the carbon emission level at the airport. Airport Carbon Accreditation Programme is the only institutionally endorsed carbon management certification standard for the airports and it recognises the efforts made by the various airports to cut the carbon emission level. The other objective of the initiative is to meet the power requirement of the terminal building at the airport. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedThe NSCBI Airport has also adopted various green initiatives in order to reduce carbon emissions and a detailed programme has been chalked out. LED lights have been fitted and a process has been initiated for efficient use of energy, thereby exploring renewable resources. Airport Authority of India has also started imparting training among its employees and various stakeholders, helping them understand their responsibility towards protection of the environment. The 15 MW solar PV plant was started in October 2017. The total cost of the project stood at Rs 82 crore.