Asteroid strike into ocean could deplete ozone layer

first_imgImage credit: NASA. (PhysOrg.com) — Scientists in Texas say if a medium-sized asteroid were to crash into the ocean the ozone layer could be depleted, allowing high levels of ultraviolet radiation to reach the surface. Citation: Asteroid strike into ocean could deplete ozone layer (2010, October 27) retrieved 18 August 2019 from https://phys.org/news/2010-10-asteroid-ocean-deplete-ozone-layer.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. More information: E. Pierazzo et al., Ozone perturbation from medium-size asteroid impacts in the ocean, Earth and Planetary Science Letters, Article in Press, doi:10.1016/j.epsl.2010.08.036 © 2010 PhysOrg.com Dr. Elisabetta Pierazzo and colleagues from the Planetary Science Institute in Tucson ran computer simulations that revealed if an asteroid 500 m to 1 km in diameter were to hit the Pacific Ocean it would eject enough water vapor and sea salt high enough into the atmosphere to affect the protective ozone layer.The results of the simulations showed the 1 km asteroid could affect an area over 1000 km in diameter, and vast quantities of water and vapor would be ejected up to 160 km high. The scientists say the water vapor would contain chlorine and bromine from the vaporized sea salts, and this would result in significant global depletion of the ozone layer by destroying it faster than it is created naturally. Pierazzo said such an asteroid would produce “an ozone hole that will engulf the entire Earth,” and produce a huge spike in ultraviolet (UV) radiation with levels higher than anywhere on the surface today.The simulations showed the smaller asteroid, 500 meters across, could produce ultraviolet index (UVI) levels of 20 or over in the northern tropics for a period of several months, and the global ozone depletion would be similar to the record ozone holes seen over the Antarctic in the mid 1990s. The 1 km asteroid could produce a spike of 56, and levels over 20 for about two years in both the northern and southern hemispheres. The UVI is a measure of UV intensity, with levels over 10 assumed dangerous. The highest recorded UVI known in recent times has been 20.Pierazzo said previous studies of the effects of asteroid impacts on the ocean have concentrated on tsunamis, but her research found the effects of a medium-sized asteroid strike would also include difficulty in growing crops and would have a long-term negative effect on global food production. She said if there was enough warning of an impending strike farmers could plant crops with high UV-tolerance and food could be stored to ensure supplies during the period of low productivity.Other effects would include increased rates of skin cancer and cataracts. People may also have to avoid exposure to direct sunlight to avoid rapid sunburn. A UVI level of 56 has never been experienced, and so the effects are uncertain, but it is likely that people would have to remain indoors during daylight to avoid serious sunburn. The study said over 100 asteroids 1 to 2 km in diameter are thought to be orbiting in paths that could bring them near to Earth, and many more smaller asteroids appear to be “currently looming undiscovered in the Earth’s neighborhood.” NASA estimates there are around 800 such Near Earth Objects (NEOs). The authors say past research suggests on average an asteroid 500 meters wide or less hits the Earth about once every 200,000 years, while a larger asteroid strike happens around once every 800,000 years.The research covered only the impact of an asteroid hitting the ocean, since such strikes are twice as likely to occur as land impacts. The results are published in the journal Earth and Planetary Science Letters. Explore further Ozone: Climate change boosts ultraviolet risk for high latitudeslast_img read more

Transistor performance improves due to quantum confinement effects

first_img Citation: Transistor performance improves due to quantum confinement effects (2011, March 21) retrieved 18 August 2019 from https://phys.org/news/2011-03-transistor-due-quantum-confinement-effects.html The team of researchers, Krutarth Trivedi, Hyungsang Yuk, Herman Carlo Floresca, Moon J. Kim, and Walter Hu, from the University of Texas at Dallas, has published their study in a recent issue of Nano Letters.In their study, the researchers lithographically fabricated silicon nanowires with diameters of just 3-5 nanometers. With a diameter this small, the nanowires experience quantum confinement effects that cause the nanowires’ properties to change from their bulk values. Specifically, transistors made with the thin nanowires have improved hole mobility, drive current, and current density – properties that make the transistors operate more quickly and efficiently. The transistors’ performance even surpasses recently reported silicon nanowire transistors that use doping to improve their performance.“The significance of this research is that we have demonstrated that increasing the degree of quantum confinement of the silicon channel results in increasing the carrier mobility,” Hu told PhysOrg.com. “We provide experimental proof of the theoretically simulated high hole mobility of about 3-nm-diameter nanowires.”At first, it may seem counterintuitive that a smaller wire can have a higher mobility than a larger wire. But as the researchers explain, quantum confinement effects increase carrier mobility in the wire by confining the holes (which contribute to the current) to a more uniform range of energy than they have in bulk silicon. Whereas in bulk silicon, holes having a broad energy distribution contribute to the current, in the tiny nanowires, the energy of the holes has a much narrower distribution. Having holes with similar energy, and therefore mass, reduces carrier scattering effects in the nanowires, which in turn improves mobility and current density. By comparing the performance of tiny nanowires to similarly fabricated nanobelts, in which only the thickness dimension is confined, the researchers also show that increasing the degree of quantum confinement of the channel results in higher carrier mobility. 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 More information: Krutarth Trivedi, et al. “Quantum Confinement Induced Performance Enhancement in Sub-5-nm Lithographic Si Nanowire Transistors.” Nano Letters. DOI:10.1021/nl103278a As the researchers note, fabricating the high-performance sub-5-nanometer silicon nanowire transistors is relatively simple compared to other methods of nanowire fabrication, which use bottom-up methods and doped junctions or channel doping. One application that the researchers plan to pursue is using the nanowires to make inexpensive, ultrasensitive biosensors, since biosensor sensitivity increases as nanowire diameter decreases. “As required by our funding (NSF Career Award), our immediate plan is to explore biosensing of protein with these types of tiny nanowire transistors,” Hu said. “We believe such small-diameter nanowires with intrinsic high performance can have a major impact on biosensing, as they are expected to provide ultimate sensitivity down to a single molecule with a better signal-to-noise ratio.”In addition to biosensing, the new high-performance transistors could have an impact on CMOS scaling, which is becoming increasingly difficult. The researchers are currently looking for funding in order to explore this area.“These transistors can have an impact on CMOS scaling due to the fact that performance actually increases with decreasing diameter,” Hu said. “Arrays of nanowire transistors with tiny nanowires could be made to achieve high performance without requiring new processing techniques. In fact, the processing can even be simplified over current techniques, as our nanowire transistors do not use highly doped complementary junctions for source/drain; eliminating high doped junctions alleviates many of the current issues in scaling down CMOS processing techniques to the nanoscale.“At large, my personal viewpoint is that silicon still has a lot of potential for nanoelectronics, and the industry may want to consider supporting research in silicon nanowire or quantum wire devices and new architectures to fully unleash the potential of silicon. Everyone is researching graphene, which is a great material of course, but we may not want to ignore the potential of silicon, as we show that effective hole mobility can be over 1200.”center_img A cross-sectional view of a 5.1-nm nanowire, taken with a high-resolution transmission electron microscope. The scale bar is 5 nm. Image credit: Krutarth Trivedi, et al. ©2011 American Chemical Society. Copyright 2010 PhysOrg.com. All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com. Nanowires made of ‘strained silicon’ show how to keep increases in computer power coming (PhysOrg.com) — Manufacturing on the nanoscale has come a long way since Feynman’s visions of nanotechnology more than 50 years ago. Since then, studies have demonstrated how low-dimensional structures, such as nanowires and quantum dots, have unique properties that can improve the performance of a variety of devices. In the latest study in this area, researchers have fabricated transistors made with exceptionally thin silicon nanowires that exhibit high performance due to quantum confinement effects in the nanowires.last_img read more

Research shows isoprene from biofuel plants likely to lead to ozone deaths

first_imgEffect of replacing crops and grasses with high-emitting SRC species in our biofuel cultivation scenario. Credit: Nature Climate Change (2013) doi:10.1038/nclimate1788 Journal information: Nature Climate Change More information: Impacts of biofuel cultivation on mortality and crop yields, Nature Climate Change (2013) doi:10.1038/nclimate1788AbstractGround-level ozone is a priority air pollutant, causing ~ 22,000 excess deaths per year in Europe, significant reductions in crop yields and loss of biodiversity. It is produced in the troposphere through photochemical reactions involving oxides of nitrogen (NOx) and volatile organic compounds (VOCs). The biosphere is the main source of VOCs, with an estimated 1,150 TgC yr−1 (~ 90% of total VOC emissions) released from vegetation globally4. Isoprene (2-methyl-1,3-butadiene) is the most significant biogenic VOC in terms of mass (around 500 TgC yr−1) and chemical reactivity and plays an important role in the mediation of ground-level ozone concentrations5. Concerns about climate change and energy security are driving an aggressive expansion of bioenergy crop production and many of these plant species emit more isoprene than the traditional crops they are replacing. Here we quantify the increases in isoprene emission rates caused by cultivation of 72 Mha of biofuel crops in Europe. We then estimate the resultant changes in ground-level ozone concentrations and the impacts on human mortality and crop yields that these could cause. Our study highlights the need to consider more than simple carbon budgets when considering the cultivation of biofuel feedstock crops for greenhouse-gas mitigation. (Phys.org)—A trio of researchers from the Lancaster Environment Centre, in the UK has found that planting trees for use as a biofuel source, near populated areas, is likely to increase human deaths due to inhalation of ozone. The team, in their paper published in the journal Nature Climate Change, suggests that increased levels of isoprene emitted from such trees, when interacting with other air pollutants can lead to increased levels of ozone in the air which might also lead to lower crop yields. Isoprene research could lead to eco-friendly car tires To reduce the amount of carbon dioxide being released into the atmosphere due to the burning of fossil fuels, governments and private groups have turned to biofuels as an alternate source. In Europe, fast growing trees such as eucalyptus, willow and poplar, have been planted and are being used to create biofuels which can be burned in engines and generators. Such trees have been seen as an attractive alternative to other edible crops, such as corn, because growing them doesn’t impact the price of food. Now however, this new research suggests that there is a different price to pay when using trees to produce biofuels.The problem, the researchers say, is that the types of trees used to produce biofuels emit high levels of the chemical isoprene into the air. Prior research has shown that when isoprene mixes with other pollutants (such as nitric oxides), ozone is produced. In this new research, the team suggests that using such trees as a biofuel could result in up to 1,400 deaths per year in Europe – per the European Union’s 2020 tree planting goal – attributable to increased amounts of ozone in the air, along with $7.1 billion in additional health care costs and crop losses.Plans for using trees as a biofuel resource generally involve planting near large urban areas to avoid incurring transportation costs. Such plantings, the researchers suggest, would lead to lung problems and deaths for people living in those areas. Conversely, if large numbers of such trees were planted in rural areas, edible crops would be adversely impacted, leading to less production and higher costs.The team also notes that ozone is currently blamed (by the European Environment Agency) for the deaths of 22,000 people in Europe each year.center_img Citation: Research shows isoprene from biofuel plants likely to lead to ozone deaths (2013, January 7) retrieved 18 August 2019 from https://phys.org/news/2013-01-isoprene-biofuel-ozone-deaths.html © 2013 Phys.org 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.last_img read more

Researchers use DNA sequencing to learn why some corals are more heat

first_img Journal information: Proceedings of the National Academy of Sciences (Phys.org)—Researchers working out of the Hopkins Marine Station at Stanford University have found that the ability of some corals to withstand higher water temperatures appears to be gene based. In their paper published in the Proceedings of the National Academy of Sciences, the group outline how they compared two types of corals commonly found in a reef in American Samoa, and found that those that are more heat resistant tend to express more gene types during normal temperature conditions. © 2013 Phys.org More information: Genomic basis for coral resilience to climate change, PNAS, Published online before print January 7, 2013, doi: 10.1073/pnas.1210224110AbstractRecent advances in DNA-sequencing technologies now allow for in-depth characterization of the genomic stress responses of many organisms beyond model taxa. They are especially appropriate for organisms such as reef-building corals, for which dramatic declines in abundance are expected to worsen as anthropogenic climate change intensifies. Different corals differ substantially in physiological resilience to environmental stress, but the molecular mechanisms behind enhanced coral resilience remain unclear. Here, we compare transcriptome-wide gene expression (via RNA-Seq using Illumina sequencing) among conspecific thermally sensitive and thermally resilient corals to identify the molecular pathways contributing to coral resilience. Under simulated bleaching stress, sensitive and resilient corals change expression of hundreds of genes, but the resilient corals had higher expression under control conditions across 60 of these genes. These “frontloaded” transcripts were less up-regulated in resilient corals during heat stress and included thermal tolerance genes such as heat shock proteins and antioxidant enzymes, as well as a broad array of genes involved in apoptosis regulation, tumor suppression, innate immune response, and cell adhesion. We propose that constitutive frontloading enables an individual to maintain physiological resilience during frequently encountered environmental stress, an idea that has strong parallels in model systems such as yeast. Our study provides broad insight into the fundamental cellular processes responsible for enhanced stress tolerances that may enable some organisms to better persist into the future in an era of global climate change.Press release Stanford marine biologists search for the world’s strongest coral Citation: Researchers use DNA sequencing to learn why some corals are more heat tolerant (2013, January 8) retrieved 18 August 2019 from https://phys.org/news/2013-01-dna-sequencing-corals-tolerant.htmlcenter_img 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. Scientists the world over agree that global atmospheric temperatures are rising and along with them are rising ocean temperatures. Because of this, those who study the seas and the organisms that live in them have been scrambling to try to find tools to help discern which will be impacted by rising temperatures and which won’t. Doing so might help direct conservation efforts.In this new research, the researchers looked to reefs off Ofu Island in American Samoa for help. Because of unique physical characteristics, pools of water exist at different temperatures and some experience extreme temperature variations on a daily basis. In studying the corals that live there, the team discovered that some of the corals did poorly as temperatures rose, while others seemed to thrive – this despite being very closely related. Suspecting that an answer might lie in their gene pool, the researchers collected some samples and took them back to their lab.The samples were put in water tanks and subjected to variable water temperature fluctuations. Each was also tested for gene expression via RNA testing using a technique known as Illumina sequencing. In studying the results of their analysis, the researchers found that all of the corals expressed hundreds of genes when exposed to higher than normal temperatures. But they also found that those that were more heat resistant also expressed approximately 60 of those same genes during normal temperature exposure as well – the team refers to this as “front-loading.” They suggest that the corals give themselves the upper hand in dealing with environmental changes by expressing more genes during normal times that might help in dealing with whatever changes may come about.The team suggests their findings may help with future conservation efforts as ocean temperatures continue to rise. By focusing resources on those most likely to survive, the hope is that more sea creatures can be saved in the long run. Pillar coral, Dendrogyra cylindricus. Image: NOAAlast_img read more

Researchers devise method to create efficient indium phosphate nanowire photovoltaics

first_img This shows a computer simulation of the absorption in five nanowires. The sunlight comes in from the top. The dark red areas, near the top, have the strongest absorption, while the dark blue areas have the weakest absorption. The simulation was done in three dimensions, but the figure shows a cross-section. Credit: Wallentin et al. Researchers the world over are on a quest to create a cheaper alternative to silicon based solar cells, some of which have been focused on using indium phosphate because it is more efficient at turning sunlight into electricity – unfortunately, it’s not very good at absorbing sunlight. In this new research, the team turned to nanowire technology to help it do a better job. This shows the photovoltaic efficiency of millimeter square InP single band gap nanowire solar cells as a function of time measured within the FP7 financed AMON-RA project. About four million InP NWs contribute to the signal. The line is a guideline for the eye. This figure gives an overview of the development of NWPV within AMON-RA. A comparison with the record efficiency development of other types of solar cells can be made using this plot by NREL: nrel.gov/ncpv/images/efficiency_chart.jpg. Credit: Wallentin et al. This is a SEM image of indium phosphide (InP) nanowires after growth, shown at a 30-degree angle. The nanowires are about 1.5 microns long and 0.18 microns in diameter, with a center to center distance of 0.47 microns (1 micron (µm) is equal to 1/1000 of a millimeter, that is, one millionth of a meter). This can be compared with the sunlight, which has most of its energy in a wavelength range from 0.5 to a few microns. The nanowires cover 12% of the surface as seen from top, that is, from the sun’s point of view. On top of the nanowire is the gold particle which is used as a seed for the crystal growth. Credit: Wallentin et al. 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. USC team develops promising polymer for solar cells In addition to being nearly as efficient as traditional silicon based solar cells, this new type of cell can also be bent to allow for shaping into flexible panels that allow for more options when mounting. It also allows for a smaller overall surface area. The team suggests that solar cells made using this approach might be best used in concentrated systems using lenses, though it’s not clear as yet whether they would stand up to the intense heat. There’s also the problem of creating the cells on a scale large enough for them to be sold commercially at a reasonable cost. More information: 1. InP Nanowire Array Solar Cells Achieving 13.8% Efficiency by Exceeding the Ray Optics Limit, Science, DOI: 10.1126/science.1230969ABSTRACTPhotovoltaics based on nanowire arrays could reduce cost and materials consumption compared to planar devices, but have exhibited low efficiency of light absorption and carrier collection. We fabricated a variety of millimeter-sized arrays of p-i-n doped InP nanowires and found that the nanowire diameter and the length of the top n-segment were critical for cell performance. Efficiencies up to 13.8% (comparable to the record planar InP cell) were achieved using resonant light trapping in 180-nanometer-diameter nanowires that only covered 12% of the surface. The share of sunlight converted into photocurrent (71%) was six times the limit in a simple ray optics description. Furthermore, the highest open circuit voltage of 0.906 volt exceeds that of its planar counterpart, despite about 30 times higher surface-to-volume ratio of the nanowire cell.2. Performance of Nanowire Solar Cells on the Rise, DOI: 10.1126/science.339.6117.263 . www.sciencemag.org/content/339/6117/263.summaryPress release This shows an optical microscope image of four nanowire solar cells. Each cell is a slightly lighter shade of purple in color, while the darker areas in between are inactive. The yellow areas are gold metal pads, which are used for connecting the solar cells to an external load. Each cell contains about 4.5 million nanowires. Credit: Wallentin et al. This shows an optical microscope image of four nanowire solar cells. Each cell is a slightly lighter shade of purple in color, while the darker areas in between are inactive. The yellow areas are gold metal pads, which are used for connecting the solar cells to an external load. Each cell contains about 4.5 million nanowires. Credit: Wallentin et al.center_img © 2013 Phys.org Explore further The idea is to create a small forest of wires standing on end atop a platform, with each wire just 1.5 micrometers tall and with a diameter of 180 nanometers. The bottom part of each wire is doped to cause an excess positive charge, the top doped to give it an excess negative charge with the middle remaining neutral – all standing on a bed of silicon dioxide. The team caused such a setup to come about by dropping gold flakes on a silicon bed and adding silicon phosphate to cause wires to grow which were kept clean and straight via etching using hydrochloric acid. The result is a photovoltaic cell capable of converting 13.8 percent of incoming sunlight into electricity while absorbing 71 percent of the light above the band gap. This scanning electron microscopy (SEM) image shows a side-view of nanowires which have been coated with a transparent and conductive oxide. The sunlight comes in from top, which is why the top contact must be transparent for light. The substrate is used for the bottom contact. Credit: Wallentin et al. (Phys.org)—Robert F. Service has published a News & Analysis piece in the journal Science describing the progress being made in nanowire photovoltaics. One of those innovations is described in another paper published in the same journal by a team working on indium phosphate nanowire technology. In their paper, they describe how in creating micrometer sized wires they have managed to build a non-silicon based solar cell that is capable of converting almost 14 percent of incoming sunlight into electric current. Citation: Researchers devise method to create efficient indium phosphate nanowire photovoltaics (2013, January 18) retrieved 18 August 2019 from https://phys.org/news/2013-01-method-efficient-indium-phosphate-nanowire.html This shows a computer simulation of the absorption in five nanowires. The sunlight comes in from the top. The dark red areas, near the top, have the strongest absorption, while the dark blue areas have the weakest absorption. The simulation was done in three dimensions, but the figure shows a cross-section. Credit: Wallentin et al. Journal information: Sciencelast_img read more

International Space Station making laptop migration from Windows XP to Debian 6

first_img © 2013 Phys.org Explore further More information: training.linuxfoundation.org/w … -for-linux-migration Citation: International Space Station making laptop migration from Windows XP to Debian 6 (2013, May 12) retrieved 18 August 2019 from https://phys.org/news/2013-05-international-space-station-laptop-migration.html Although Linux machines, like Windows, are not malware-proof, the fact that Linux is an open source operating system means that a community overseeing a Linux distribution can issue quick notices and quick patches. Debian’s site claims that mails sent over to the mailing lists get answers in 15 minutes or less and by the people who developed it. They also note that their bug tracking system is open and encourages users to submit their bug reports; users are notified when the bug was closed. “We don’t try to hide the fact that software doesn’t always work the way users want,” according to the Debian site.An incident in 2008 apparently made space-station personnel more aware than ever of a computer virus’ ability to disrupt operations in the absence of support from an open source community. That was the year the station computers were infected by the Gammina.AG. Virus after an astronaut brought an infected USB or flash drive into orbit. The virus infected other computers on board.Chuvala and NASA selected Debian, a system that uses Linux or the FreeBSD kernel. Debian can run on almost all personal computers. Ubuntu, which is a popular Linux-based operating system, said on its site that “Debian is the rock upon which Ubuntu is built.” Debian began in August 1993 by Ian Murdock, as a new distribution to be made openly in the spirit of Linux and GNU. The ISS adopted Debian 6. The Linux Foundation stepped in to assist with tailored training in the form of two courses, Introduction to Linux for Developers and Developing Applications For Linux. The courses prepared them for developing apps related specifically to the needs of the ISS.center_img (Phys.org) —The International Space Station has decided to switch dozens of laptops running Windows XP over to Debian. What Linux fans have been saying for years—that Linux delivers greater stability and reliability for public and private computing environments—resonated with Keith Chuvala, the United Space Alliance contractor manager involved in the switch. The change at the International Space Station is all about the replacement of dozens of laptops with XP being switched over to Debian 6. Chuvala said, “We needed an operating system that was stable and reliable – one that would give us in-house control. So if we needed to patch, adjust or adapt, we could.” The Year of OpenSolaris 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

Researchers develop model to help control cascading events

first_img Examples of taking small actions to prevent a large catastrophe are numerous—workers at ski resorts commonly use dynamite to cause small landslides in the hopes of avoiding larger ones, is just one example. The problem with such efforts is that there is no scientific or mathematical basis for such actions. How do ski operators know that they are reducing risk; worse, how do they know that they’re not making things worse? Sadly, the current model is to use past experience, hunches, and sometimes prayer. In this new effort, the research team sought to create a computer model that could help control a complex system in a reproducible way. It’s all based on what’s known as the theory of self-organized criticality (SOC).The team began by reproducing the efforts of prior researchers where simulated grains of sand were used to create simulated mounds, along with simulated avalanches when critical points were reached. To better simulate the real world, the researchers created several mounds, all close enough to one another to be impacted by the others should they crumble. In so doing, the researchers studied the most important sand grain of all—the one that causes a mound to topple. Prior research had shown that the mounds organized themselves into critical states that could be described by power-law avalanche size distribution, which is what SOC describes. In this new model, the researchers assigned a variable to the probability of a given mound cascading if one more grain were added to it, then sought to control that variable. They found that by increasing or decreasing its value, cascades could be both initiated and avoided. By running the model with different values, the team found they were better able to study the dynamics of the entire system.The most interesting result they found was that sometimes if they tried too hard to suppress large avalanches by causing smaller ones, they were inadvertently increasing the chances of a large one happening anyway.While the researchers’ model is interesting, there is no clear evidence that suggests real-world events transpire as clearly as can be defined by a computer simulation. For that reason, much more work will have to be done before it’s known whether the new model might be used to help control real-world systems. Explore further Citation: Researchers develop model to help control cascading events (2013, August 19) retrieved 18 August 2019 from https://phys.org/news/2013-08-cascading-events.html Journal information: Physical Review Letters © 2013 Phys.org (Phys.org) —A team of researchers at the University of California has developed a model that might lead to a better way to control natural cascading events such as landslides, earthquakes, or even neural networks. In their paper published in the journal Physical Review Letters, the team describes how they expanded on prior research using simulated sand piles to develop statistical models for controlling complex cascading events.center_img Schematic representation of the sandpile model used by Noël et al. When one grain falls on top of a pile with three grains (a), the pile becomes unstable and topples. While toppling, all grains in the pile are evenly distributed among the four neighbors (b). The toppling cascades further as one neighboring pile becomes unstable (four grains) and also topples (c). Credit: APS/Alan Stonebraker Researchers discover midair collisions enhance the strength of sandstorms More information: Controlling Self-Organizing Dynamics on Networks Using Models that Self-Organize, Phys. Rev. Lett. 111, 078701 (2013)AbstractControlling self-organizing systems is challenging because the system responds to the controller. Here, we develop a model that captures the essential self-organizing mechanisms of Bak-Tang-Wiesenfeld (BTW) sandpiles on networks, a self-organized critical (SOC) system. This model enables studying a simple control scheme that determines the frequency of cascades and that shapes systemic risk. We show that optimal strategies exist for generic cost functions and that controlling a subcritical system may drive it to criticality. This approach could enable controlling other self-organizing systems. 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

Bubble technique used to measure shear forces between graphene sheets

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. (Phys.org)—A team of researchers from China and the U.S. has devised a relatively simple means for measuring the shear forces that exist between sheets of graphene and other materials. In their paper published in the journal Physical Review Letters, the group describes the technique and the results they found when using it to measure shear forces for several types of 2-D materials. More information: Guorui Wang et al. Measuring Interlayer Shear Stress in Bilayer Graphene, Physical Review Letters (2017). DOI: 10.1103/PhysRevLett.119.036101ABSTRACTMonolayer two-dimensional (2D) crystals exhibit a host of intriguing properties, but the most exciting applications may come from stacking them into multilayer structures. Interlayer and interfacial shear interactions could play a crucial role in the performance and reliability of these applications, but little is known about the key parameters controlling shear deformation across the layers and interfaces between 2D materials. Herein, we report the first measurement of the interlayer shear stress of bilayer graphene based on pressurized microscale bubble loading devices. We demonstrate continuous growth of an interlayer shear zone outside the bubble edge and extract an interlayer shear stress of 40 kPa based on a membrane analysis for bilayer graphene bubbles. Meanwhile, a much higher interfacial shear stress of 1.64 MPa was determined for monolayer graphene on a silicon oxide substrate. Our results not only provide insights into the interfacial shear responses of the thinnest structures possible, but also establish an experimental method for characterizing the fundamental interlayer shear properties of the emerging 2D materials for potential applications in multilayer systems. Explore further 2-D layered devices can self-assemble with precision As graphene sheets are used in more applications, it has become important to better understand the shear forces at play between them and other materials. Learning more could prevent sheets from coming apart, for example, when they are used to make an electronic device. In some applications, graphene sheets are layered with other graphene sheets, while in others, graphene sheets are applied to sheets of other materials. But until now, there was no way to measure how well such materials clung to one another. Traditionally, such measurements are made by adhering sheets of material and then pulling them in opposite directions—a means of measuring their shear force. But because graphene sheets are single atom thick, that approach is not feasible. In this new effort, the researchers have found a new way to measure shear forces between such materials.In the new method, tiny holes were drilled in one sheet before it was adhered to another sheet. Air was then used to generate pressure from below, causing the top sheet to rise and pulling the sheet below with it, forming a bubble. The researchers then used Raman spectroscopy to measure the amount of stretching at the base of the bubble as a means of measuring the shear forces between the two materials.Using their technique, the researchers were able to measure the shear force between two sheets of graphene and found it to be 40 kPa, which is considered very small and unsurprising, as sheets of graphene have been used as a lubricant. The team also measured the shear force between a sheet of graphene and a sheet of silicon dioxide, and found it to be 1.64 MPa—which is approximately 40 times greater than the shear force between graphene sheets.center_img Journal information: Physical Review Letters © 2017 Phys.org Citation: Bubble technique used to measure shear forces between graphene sheets (2017, July 19) retrieved 18 August 2019 from https://phys.org/news/2017-07-technique-sheer-graphene-sheets.html This cutaway shows the bulging that occurs when air is pumped through a hole underneath a graphene sheet. Researchers estimated the shear resistance by measuring the stretching in the sheet around the hole. The stretching for bilayer graphene (blue) is much larger than that for monolayer graphene (yellow). Credit: L. Liu, C. Weng, & G. Wang/NCNSTlast_img read more

Astronomers discover a hot Jupiter orbiting a rapidly rotating star

first_img Citation: Astronomers discover a ‘hot Jupiter’ orbiting a rapidly rotating star (2017, December 20) retrieved 18 August 2019 from https://phys.org/news/2017-12-astronomers-hot-jupiter-orbiting-rapidly.html KELT-21b was discovered by a group of researchers led by Marshall C. Johnson of the Ohio State University. The astronomers used the KELT-North telescope at Winer Observatory in Arizona to observe the star KELT-21 (also known as HD 332124) as part of the Kilodegree Extremely Little Telescope (KELT) project. This survey detects transiting exoplanets around bright stars.Johnson’s team identified a transit signal in the light curve of KELT-21. The planetary nature of this signal was later confirmed by a follow-up observational campaign that employed the KELT Follow-Up Network (KFUN) consisting of various ground-based observatories worldwide.”Here we present the discovery of a new transiting hot Jupiter, KELT-21b, confirmed using Doppler tomography,” the paper reads.The study reveals that KELT-21b has a radius of about 1.59 Jupiter radii, but its exact mass remains uncertain. The researchers only determined its upper mass limit to be approximately 3.91 Jupiter masses. KELT-21b orbits its star every 3.61 days at a distance of about 0.05 AU from the host. The planet has an equilibrium temperature of 2,051° K. The parameters of KELT-21b show that it is an another example of a “hot Jupiter” exoplanet. The so-called “hot Jupiters” are gas giant planets, similar in characteristics to the solar system’s biggest planet, with orbital periods of less than 10 days. They have high surface temperatures, as they orbit their host stars very closely. When it comes to the host, it is a metal-poor star of spectral type A8V, with a radius of about 1.63 solar radii and nearly 46 percent more massive than the sun. The star is about 1.6 billion years old and has an effective temperature of approximately 7,600° K.Notably, KELT-21 has a relatively very high projected rotation velocity of 146 km/s. This makes it the most rapidly rotating star known to host a transiting giant planet. KELT-21 also turns out to be one of only several known A stars to be orbited by a transiting planet.Besides discovering and characterizing KELT-21b, Johnson’s team also found two stars of about 0.12 Jupiter masses each that could be associated with KELT-21. However, they cannot confirm this finding with available data, therefore further observations are required to validate this assumption.”Our high-resolution imaging observations revealed the presence of a close pair of faint stars at a separation of 1”.2 from the planet host star. Although we cannot confirm using our current data whether they are physically associated with the KELT-21 system, we have argued statistically that they are unlikely to be background sources,” the researchers wrote in the paper.If this hypothesis is confirmed, it would mean that KELT-21b is one of only a handful of known transiting exoplanets in hierarchical triple stellar systems. More information: KELT-21b: A Hot Jupiter Transiting the Rapidly-Rotating Metal-Poor Late-A Primary of a Likely Hierarchical Triple System, arXiv:1712.03241 [astro-ph.EP] arxiv.org/abs/1712.03241 © 2017 Phys.org All follow-up transits of KELT-21b combined into one light curve (grey) and a 5 minute binned light curve (black). The red line is the combined and binned models for each transit. Credit: Johnson et al., 2017. New ‘hot Jupiter’ with short orbital period discovered Explore further An international team of astronomers has found a “hot Jupiter” exoplanet circling a rapidly rotating, metal-poor star. The newly discovered alien world, designated KELT-21b, is larger than Jupiter and orbits its host in less than four days. The finding is presented in a paper published December 8 on arXiv.org. 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

Using physics to make better GDP estimates

first_img Economic models significantly underestimate climate change risks Citation: Using physics to make better GDP estimates (2018, July 31) retrieved 18 August 2019 from https://phys.org/news/2018-07-physics-gdp.html Credit: CC0 Public Domain 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. Journal information: Nature Physics More information: A. Tacchella et al. A dynamical systems approach to gross domestic product forecasting, Nature Physics (2018). DOI: 10.1038/s41567-018-0204-yAbstractModels developed for gross domestic product (GDP) growth forecasting tend to be extremely complex, relying on a large number of variables and parameters. Such complexity is not always to the benefit of the accuracy of the forecast. Economic complexity constitutes a framework that builds on methods developed for the study of complex systems to construct approaches that are less demanding than standard macroeconomic ones in terms of data requirements, but whose accuracy remains to be systematically benchmarked. Here we develop a forecasting scheme that is shown to outperform the accuracy of the five-year forecast issued by the International Monetary Fund (IMF) by more than 25% on the available data. The model is based on effectively representing economic growth as a two-dimensional dynamical system, defined by GDP per capita and ‘fitness’, a variable computed using only publicly available product-level export data. We show that forecasting errors produced by the method are generally predictable and are also uncorrelated to IMF errors, suggesting that our method is extracting information that is complementary to standard approaches. We believe that our findings are of a very general nature and we plan to extend our validations on larger datasets in future works.center_img Currently, economists use a variety of models to produce GDP estimates, which are often used by law and policy makers to inform decisions about future events. Such models typically require a host of variable inputs and are quite complex. In sharp contrast, the estimates made by the Italian team used just two variables: current GDP and another they describe as “economic fitness.”The researchers calculated a number for a given country’s economic fitness using physics principles applied to export products. Such factors as diversification and the complexity of the products were taken into account, offering a means of gauging the relative strength of a given economy. The idea was to rate a country’s economic strength—the wider the range of products being exported and the more complex they were, the more likely GDP was likely to grow—and used that to forecast future prosperity.The team reports that they have been running their models for approximately six years—long enough for them to see how well their estimates matched actual GDP numbers over time. They report that their estimates were on average 25 percent more accurate than were those made by the International Monetary Fund. They report also that their models accurately predicted the booming Chinese economy in 2015 when more traditional models suggested the country was headed for a slowdown.The researchers explain that the field of economic complexity involves studying the behavior of economies over time and the factors that cause them to change. Doing so includes using tools such as those that have been developed to measure turbulence in fluids and traffic jams. The philosophy of such research, they explain, revolves around the idea that complex systems with a large number of elements that interact in non-linear ways tend to have emergent properties. Learning to understand such properties, they further note, can offer insights into relationships such as the one between exports and GDP trends. A team of Italian physicists has used economic complexity theory to produce five-year gross domestic product (GDP) estimates for several countries around the world. In their paper published in the journal Nature Physics, Andrea Tacchella, D. Mazzilli and Luciano Pietronero describe how they applied the theory to economic forecasting and how well it has worked thus far. © 2018 Phys.org Explore furtherlast_img read more

Researchers find a core cow microbiome dictates dairy cow productivity and emissions

first_img More information: R. John Wallace et al. A heritable subset of the core rumen microbiome dictates dairy cow productivity and emissions, Science Advances (2019). DOI: 10.1126/sciadv.aav8391 Explore further As the planet continues to warm due to human-related activities, scientists continue to look for ways to reduce greenhouse gas emissions. In this new effort, the researchers wondered if it might not be possible to reduce the amount of methane released by cattle. Livestock have been found to contribute up to 14.5 percent of such gases worldwide. Far less methane is released into the atmosphere each year than carbon dioxide, but methane is better at trapping heat.The researchers note that prior research has shown that the primary generator of methane in cows is the rumen—the first stomach. When a cow eats grass, it goes into the rumen, where a host of microbes reside along with other digestive materials. The host microbes work together to break down the carbohydrates via a fermentation process. As part of that process, hydrogen is produced by certain types of bacteria, and then archaea combine carbon dioxide with the hydrogen to produce methane. Contrary to common belief, most of the methane is belched out of the cow’s mouth.To find out if cows could be coaxed into producing and belching less methane, the researchers conducted a genetic analysis of the microbes that exist in the rumen of several types of cows from several sites across Europe. In all the team collected samples from more than 1000 cows. Study of their rumen microbiome showed that half of all of the microbes in them had 512 species in common. They also found that 39 of the microbes made up a core that plays a major role in determining not just how much methane is produced, but also how much milk. The researchers are now looking into the possibility of manipulating the cow rumen biota to see if it is possible to bring about changes that will result in less methane production. Credit: CC0 Public Domain Study shows potential for reduced methane from cows Citation: Researchers find a core cow microbiome dictates dairy cow productivity and emissions (2019, July 5) retrieved 18 August 2019 from https://phys.org/news/2019-07-core-cow-microbiome-dictates-dairy.htmlcenter_img An international team of researchers has found that a core cow microbiome dictates dairy cow productivity and methane emissions. In their paper published in the journal Science Advances, the group describes DNA testing they did on rumen microbes in cattle in several European countries and what they found. Journal information: Science Advances © 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.last_img read more

Ambedkar meets Gandhi on src stage

first_imgWe live in a society of extremes these days. Find about about the extremes through a play. Ambedkar aur Gandhi, a socio-political play, will be presented by the Asmita Theatre group. The play shows a debate between Gandhi and Ambedkar and talks about the geopolitical and social scenario in the country from two extreme points of view. The play is a political dialogue on the social concerns of our feudal society. It showcases the conflicting thoughts of two political stalwarts with similar aim but different means. Also Read – ‘Playing Jojo was emotionally exhausting’Says actor Gaurav Mishra, who enacts the role of Gandhi: ‘It has been the most challenging role so far. My mind played like a time machine. To think like him, his body language, upgrade my thinking abilities like him have been my priority throughout besides reading about him. My director Arvind Gaur also helped me get into the character.’The issue of the upliftment of Harijans and the plight of Dalits is a significant thread expressed in the play. Also Read – Leslie doing new comedy special with Netflix‘Ambedkar, the fiery man, let out his ideology through his candid nature. His outspoken personality with a never-sit-idle attitude triggered me to justify the role. It’s very close to my heart as I comprehend his opinions and ideology towards life,’ says Bajrang Bali Singh who plays the role of Ambedkar.‘This play operates at many levels to show the multiple layers of the thought processes of both the leaders and brings about the multi-layered confrontations due to the differences between them. This kind of bold theatre forces us to rethink about our make belief comfortable history and breaks our pre-conceived socio – political notions,’ says Arvind Gaur, the director of the play.DETAILAt: Shri Ram Centre, Mandi House When: Today Timings: 7 pm Entry: Rs 200, 100, 50last_img read more

Tiger on Delhis mind

first_imgA leading telecom company recently tied up with Galerie Art Eterne to mobilise the art world and unleash their vision of the tiger on the canvas. The art project ‘Strokes for Stripes’ featured various artists who showcased their imagination of the tiger, the national animal and pride which is sadly on the verge of extinction.The works of the artists culminated in the form of a calendar for 2013. These soul stirring art pieces were subsequently auctioned to raise funds to highlight the need of tiger conservation and create awareness for the cause. Also Read – ‘Playing Jojo was emotionally exhausting’Vivek Menon, executive director, Wildlife Trust of India (WTI) said: ‘Wildlife conservation would not be possible without support and funding from charitable organisations, institutions and individuals. CSR focus on wildlife has also been on a rise in the country, which is a positive trend.’Eminent artists whose works were showcased included Arpana Caur, Jai Zharotia, Niladri Paul, Prof. Niren Sengupta, Sanjay Bhattarcharya, Ajay Zharotia, Krishnendu Porel, Pratul Dash, P. Shivani Bhardawaj, Amarendra Maharana, Prittam Priyalochan, Sandeep Jigdung and Vinita Dasgupta. Also Read – Leslie doing new comedy special with Netflix‘I am proud to be a part of this cause. Doing my bit for this social cause gives me an inner satisfaction, that is all I wanted to do,’ said P. Shivani Bhardawaj, whose portrait was sold for Rs 2 Lakh at the auction.The portraits which were originally priced at Rs 1 lakh each were sold for Rs 3-4 lakhs at the auction. The proceeds from the auction were donated to WTI, the initiative’s cause partner who will channelise these funds for ‘Save Our Tigers’ initiative.The event witnessed performances by Louis Banks, a Grammy Award nominated music composer and adman-lyricist Prasoon Joshi who wrote a few lines especially for the occasion. Diverse groups such as artists, environmentalists, conservationists were present at the event, to lend their support to the cause.last_img read more

Catch a falling Angel

first_imgBonjour India is set to conclude on a high note with the cherubic angels descending upon the earth on 31 March at Jawaharlal Nehru Stadium. The festival in Indo French collaboration had been an exceptional experience across various disciplines in arts, science and academia.The acrobatic artists who performed The Flying Angels show at the London Olympics 2012, will be enthralling the city on the occasion of this grand finale.The enchanting aerial, acrobatics street circus where angels take over the cityscape making the sky best place on earth will be an wondrous experience for the children and would rejuvenate the childhood in adults. Also Read – ‘Playing Jojo was emotionally exhausting’Dressed in white, the angels engage the audience below with special charm, showering feathers.The show, performed by Les Studios de crique is directed by Pierrot Bidon and Stephane Girard.An ancient legend goes that every 500 years angels descend upon the earth to indulge in our worldly pleasures. The French troupe ‘Les studios de cirque’ brings this legend to life. A steel dome is erected, like an arched staircase from heaven and the acrobat-angels are suspended from the dome, flying across it, moving around it and enthralling the people gathered beneath. Also Read – Leslie doing new comedy special with NetflixAs acrobats leap from one trapeze to another across the steel arches and some others land elegantly on the dome above, all of them dressed in white as angels, they engage the audience below with the special charm only circus artists have. This show will be a wondrous experience not only for children but it will also speak to the child in adults. Come and celebrate with us and enjoy aerial acrobatics that has never been seen before in DelhiDETAILPlace: Jawaharlal Nehru StadiumDate: 31 MarchTime: 7:15 pmlast_img read more

Tourism then and now

first_imgThe program started with Ganesh Vandana and was followed by lighting of the inaugural lamp by Ramesh Tiwari, MD and CEO, DTTDC along with Ravi Dadhich, GM, DTTDC. In the year 1975, Delhi Tourism and Transportation Development Corporation (DTTDC) was brought into being and now it has turned 39. All these years have been full of activities, events and ambitious projects to transform Delhi into a spectacular tourist friendly destination.Delhi Tourism has always been striving to make Delhi a city of never-ending delights, and all efforts have paid in terms of endowing it a unique identity at local as well as international platforms. Winning various accolades as a favourite destination for travelers, Delhi is a vibrant place for an animated and comfortable travel experience. In a bid to celebrate the 39 memorable years of sublime achievement, various cultural programs were organised to entertain the employees of the organisation. Also Read – ‘Playing Jojo was emotionally exhausting’These presentations included special bhangra performance, mind boggling magic show, Tanura dance, patriotic songs along with other captivating events. Tanura, an Egyptians folk dance, not only dazzled the audience but the bright outfits of the performers was a major attraction. A special time slot was also kept for the employees of DTTDC to showcase their skills and nearly 6 of them presented melodious compositions along with lively dance acts. Chakradhari, a special wheel balancing act was also performed which held everyone’s attention. Kids of Boogie Woogie fame took part in the occasion and showcased their unique dance acts.Since its inception, Delhi Tourism has been instrumental in promoting tourism in and around Delhi through various activities and projects.last_img read more

Blind students in DU to get smart canes and DAISY players

first_imgVisually-challenged students of Delhi University will soon be getting ‘mobility and accessibility’ kits, including DAISY players and smart canes to help them move around with ease on campus.“DU has joined hands with the Ministry of Social Justice and Empowerment to provide mobility and accessibility kits to the varsity’s visually-challenged students enrolled,” said Anil Aneja, Officer on Special Duty at DU’s Equal Opportunity Cell (EOC).“The kit will consist of smart canes and DAISY players. While the smart canes will help the students have hassle-free mobility on campus, the DAISY players will make their studies easier,” he said. DU has roped in the services of the National Institute for the Visually Handicapped (NIVH), Dehradun, for working on the kits. “While funds for the initiative have been provided by the ministry, the contents of the kit have been developed by NIVH. Also Read – Company director arrested for swindling Rs 345 croreThere is also a plan to include special tablets designed for the visually-challenged in the kits, but that will be worked out in the second phase,” Aneja said. The cost of each kit is estimated to be around Rs 11,000.While the canes will be able to give vibration warnings to the students whenever there is any obstruction within a certain range, the DAISY player, which is a book-reading machine, will be able to help them in comfortably going through texts. Also Read – Man who cheated 20 women on matrimonial websites arrested“Though the distribution of these kits will begin by the end of this month, from the coming session, we plan that the kits are handed over to the students during the freshers’ orientation programme,” added Aneja.The students will not be bound to return the kits to the varsity when they pass out, he said.DU had earlier also installed a special technology which can scan books and transcribe text to speech in all its libraries, a move which the varsity claims is a first-of-its- kind initiative for visually-challenged students by an Indian university. The technology installed last year is known as ‘Inclusive Print Access Project’ and is a combination of softwares which have been imported from abroad to suit the needs of the visually-challenged students.The DU Equal Opportunity Cell was established in 2006 to address the needs and issues related to physically-challenged, SC/ST, OBC and minority students.DU allows for a 5 per cent relaxation in eligibility criteria with respect to differently-abled students.A Braille library and an Audio Book Resource Centre are among the facilities introduced by the university for its differently-abled students.last_img read more

DRI seizes 15 kg foreignorigin gold in Bengal

first_imgKolkata: The Directorate of Revenue Intelligence (DRI) has seized around 15 kg of foreign origin gold valued at Rs 4.72 crore from the Barasat area near here. Inputs suggested that the gold, smuggled from Bangladesh into the country from North 24 Parganas district, was being ferried in a vehicle towards Kolkata for further delivery, a statement issued today by the DRI said. One person has been arrested and a Bolero vehicle, in which the gold was being carried, has been seized on Wednesday, it said. Also Read – Heavy rain hits traffic, flights The seized gold biscuits weighing 15 kg had foreign markings ‘Al Etihad’ and ‘Suisse’, the probe agency said. In the current financial year so far, in the region spread over West Bengal and the north eastern states, the DRI has seized over 105 kg of gold and gold jewellery valued at close to Rs 31 crore in the market, smuggled from Bangladesh, Myanmar and even Bhutan. In the financial year 2017-2018, the DRI had seized close to 430 kg of gold and gold jewellery in the east and north east region collectively valued at more than Rs 100 crore.last_img read more

Surprised why Darjeeling has not been explored yet

first_imgKurseong: It takes a lot to surprise Rajinikanth, the Superstar who has been, time and again, depicted as a superhuman on celluloid and in the thousands of jokes woven around his alleged super human powers.However, Rajinikanth has expressed surprise as to why the beautiful locations in the Queen of the Hills haven’t been explored in celluloid films yet.West Bengal Tourism Minister Gautam Deb met the Superstar in Kurseong on Thursday carrying good wishes and a flower bouquet from Chief Minister Mamata Banerjee. Also Read – Heavy rain hits traffic, flightsRajinikanth is at present in Kurseong to shoot for an untitled Tamil movie directed by Chennai-based filmmaker Karthik Subbaraj. The film is being shot extensively in Kurseong and Darjeeling.Talking to media persons after the meeting, Rajinikanth stated: “I am surprised that Darjeeling, which is such a beautiful place with such beautiful locations, has not been explored yet. Though through this film, the whole country will know everything about this place and will explore it.” Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedThalaiva (leader) was all praises for Darjeeling. “This is the land of Ramakrishna Paramahamsa, Swami Vivekananda, Subash Bose and Ravindranath Tagore. I am really happy to meet such lovely people, good and kind-hearted people here. I am here in Kurseong and Darjeeling for the next 30 days to shoot for a film,” stated Rajinikanth. The Superstar was happy regarding his film “Kaala.” “By God’s grace it’s doing well throughout the country,” stated Rajinikanth.When confronted with the question on his political plans on the backdrop of Kamal Hasan floating a political outfit, Rajinikanth sidestepped the question saying: “I have come here as an actor.”Even Minister Gautam Deb did not disclose if they had any political discussion. “I don’t want to discuss anything political. As an emissary of the Chief Minister, I requested Rajinikanth ji to promote Darjeeling and Dooars as a film shoot destination. I requested him to share his experiences of Darjeeling with others. Our State Government will provide all cooperation for a hassle free shoot,” assured the Minister. Before coming to Darjeeling Rajinikanth had called up CM Mamata Banerjee, stated Gautam Deb.The Minister also stated that the Superstar was truly impressed with Darjeeling. “The director had visited all the Hill Stations and then zeroed in on Darjeeling. I told him that numerous films including Aradhana, Barsaat Ki Ek Raat, Barfi and Jagaa Jasoos have been shot in Darjeeling,” stated the Minister.The Minister also stated that the situation in the Hills is normal and peaceful now. Incidentally, Darjeeling had witnessed a prolonged agitation in June 2017, including a 104-day long bandh.”The credit for bringing back normalcy goes to the people of the Hills and Chief Minister Mamata Banerjee” stated Deb.Rajinikanth had arrived in Kurseong on June 6. The shoot started in Kurseong from June 7 and will continue till June 15 at Eastern Forest Rangers College. From Kurseong, the superstar will head for Darjeeling, where the film will be shot from June 17 to July 6. The film will then be shot in Kurseong again from July 7 to July 12.last_img read more

Sanitation workers go on strike again

first_imgStandoff between Arvind Kejriwal-led AAP government and BJP ruled three Municipal Corporations in the Capital region may halt civic services such as garbage disposal and sanitisation works again as thousands of safaikarmis(sanitation workers) of East Corporation who went on indefinite strike from Monday while employees of North Corporations are expected to join in a couple of days. Notably, the Capital had witnessed a similar situation inend of March when nearly 70,000 sanitation workers, who are fourth grade employees, had gone on strike demanding release of their salaries. Also Read – Company director arrested for swindling Rs 345 croreThe move of sanitation workers had resulted in garbage pile-ups in every nook and corner of the city and the crisis, in all probability, will deepen this time as the workers are reluctant to resume work. On Monday morning, nearly 13,000 sanitation workers stopped collecting garbage from their respective areas and cleaning streets demanding immediate release of their salaries along with fulfilment of other promises. The workers claim their salaries have not been paid since April and demand full payment of dues. Also Read – Man who cheated 20 women on matrimonial websites arrested“We need to be paid two months’ wages. We are hungry, we don’t have anything to feed our children with, which is why we are here on the streets protesting. During the earlier strike, we were assured that we would get our salaries on time but the Corporations have failed to do fulfil their promise. In one or two days, employees of other Corporations will also join us as they have also not received salaries for the past two months,” said Rajendra Mewati, leader of sanitation workers. Like the earlier strike, sanitation workers not only refused to clean up the streets, but gathered at various locations and dumped rotting garbage on the streets. “The EDMC is responsible for paralysing civic services as it is not willing to pay our salaries. We want the government to take notice and give us our dues. If they pay us our wages, we are willing to return to work tomorrow (Tuesday),” said Mewati.last_img read more

Coining a bright future

first_imgNo nation can advance and progress unless it has acquired competence in education. Education, with its various disciplines, has a great contribution in the growth of a nation. The post independence era has undergone some considerable changes owing to a rapid and an incredible global progression. New policies and strategies have affected the overall growth and development of nations leading to a new scenario and further transformed the profile of education. The educational segment, with its multiple challenges, warranted professional competence and industrial talent to seek substantial gains in terms of imparting education to the masses and ultimately make the country’s human resources more fruitful. Also Read – ‘Playing Jojo was emotionally exhausting’Maharishi Markandeshwar University, Mullana— Ambala, erstwhile known as Maharishi Markandeshwar Education Trust, was founded with the objective of social, educational and economic upliftment of society in the year 1993. It has become a symbol of quality education in technical, professional and medical streams in northern India and has been carrying on its lineage for over 18 years. These institutes are also approved by the regulatory bodies like Medical Council of India, Dental Council of India, Indian Nursing Council, Indian Association of Physiotherapists, and All India Council for Technical Education etc. Also Read – Leslie doing new comedy special with NetflixMMU MULLANAMM University at Mullana is the oldest and the flagship campus of the MM University Trust. Established in 1995, MM Engineering College was the first amongst the long chain of educational institutions under MM University Trust. Just as the college expanded horizontally in size, it also rose vertically, acquiring the post graduate courses in engineering, science and humanities, attaining the peak with the introduction of medical college. The institute was declared a deemed university by the UGC in 2007. The world-class sprawling 75 hectare university campus today houses a multi-specialty hospital with Out Patient Department (OPD) and emergency services. The constituent institutions of the University are MM Engineering College, MM Institute of Computer Technology and Business Management (MCA), MM College of Dental Sciences and Research, MM Institute of Physiotherapy and Rehabilitation, MM Institute of Computer Technology and Business Management (Hotel Management), MM Institute of Medical Sciences and Research, MM Institute of Management, MM College of Nursing, MM College of Pharmacy, MM Institute of Nursing, and Department of Law. MMU SOLAN Maharishi Markandeshwar University, Solan, is spread over an area of 47 acres on Chandigarh-Shimla National Highway at Sultanpur Road, Solan. Established as a multi faculty university in 2009, the university has been operational with admissions to School of Medical Sciences, School of Engineering and Technology, School of Computer Technology and School of Business Management. MMU AMBALA As a part of its expansion programme, the MM University Trust has developed another 40 acre campus at Sadopur on Delhi-Chandigarh National Highway near Ambala for providing professional education to the people of the surrounding region.Beginning with graduate and post-graduate courses in Engineering and Technology, Architecture, Business Management and Computer Technology from the 2010-11 session, it also offers M.Phil programmes to qualitatively enhance the research skills. In the coming years the Sadopur campus plans to begin programmes in medical sciences, dental sciences, nursing, fashion technology, etc. PLACEMENT CELLThe training and placement activities of all institutions under MMUT are coordinated at a joint placement cell of the university. A dedicated team of members relentlessly makes sincere efforts to create corporate contacts. More than 300 companies have visited various institutions of MMU for on-campus placements. SUCCESS & GLORYThe Maharishi Markandeshwar University Trust (MMUT) has several firsts to its credit. It opened the first self-financing Engineering College, Medical College and Deemed University in Haryana. MM Institute of Hotel Management and Catering Technology was the first private hotel management college to be established in State of Haryana. It has received top ranking in various surveys conducted by accredited agencies. Internationally, it has won the NASA System Engineering Award and has been accredited as a premier institute by ASIC, UK.MISSIONTheir aim is to prepare students with an integrated and technology-oriented education for a better career and to be worthy citizens of a global society. Also, to achieve perfection the aspirants and knowledge seekers resort to modern means and trends in technical and professional education.last_img read more