Comparison of the atmospheric density distribution during the aftermath of two impact events, one at the SL9 impact angle (left) and one at the 2009impact angle (right). The undisturbed Jovian atmospheric density proﬁle is plotted in the background. Image Credit: Pond, et al. © 2012 PhysOrg.com New evidence that asteroid, not comet, struck Jupiter in 2009 Of the eight objects modeled in the team’s simulations, most of the 0.5km objects cannot account for the disturbances seen in Jupiter’s atmosphere from the 2009 impact. The smaller objects appear to not penetrate far enough to explain ammonia observations in Jupiter’s stratosphere. Given the results of the 0.5km objects, the team was able to set a lower limit on the size and density estimates for the July 2009 impactor. Although most of the 0.5km objects were ruled out, the 0.5km basalt impactor, and all of the 1km impactor plumes penetrated far enough into Jupiter’s atmosphere to reach the ammonia ice cloud level in the troposphere. (PhysOrg.com) — During July of 1994, both amateur and professional astronomers were captivated as comet Shoemaker/Levy 9 broke apart and slammed into the atmosphere of Jupiter. While these types of impacts are generally rare, a second impact event occurred fifteen years later in July of 2009. The object responsible for the 2009 impact was not directly observed, so astronomers could only make inferences about the object based on the disturbances in the Jovian atmosphere, as shown in the image above. New research by Jarrad Pond (University of Central Florida), and a team from the University of Central Florida and University of California, Santa Cruz aims to help determine the object responsible for the 2009 impact on Jupiter. Without a direct observation of the event, the team used numerical simulations in order to better understand the object responsible for the large disturbance of the Jovian atmosphere. Using three dimensional hydrodynamics code, the team modeled the impacts of eight simulated impactors. The team used impactors of .5 and 1km, with different densities and compositions (basalt or ice). By using the same impact angle (69 degrees) and impact velocity 61.4 km/sec), the team was able to narrow down the potential size and composition of the object responsible for the July 2009 impact. 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 mentions that more simulations are necessary in order to better constrain the impact characteristics with additional parameters. Additionally, the team asserts that ammonia transport from the upper troposphere to the stratosphere by means of the impact plumes must be investigated. With additional research, the team hopes to further refine the possible causes of the atmospheric disturbances related to the July 2009 Jupiter impact event. The team’s work can be found in the February 1st. issue of The Astrophysical Journal (745:113), or via ArXiv.
Global warming threatens more than just coral Explore further Dutch designers from Waterstudio as part of the collab will construct a network of floating islands for luxury residences, hotels, convention center, yacht club and a floating golf course. For the number of 400,000 Maldives residents, a next-phase plan is to build islands for affordable housing. “Islands” are in the plural because the Maldives is an island nation in the Indian Ocean, made up of a chain of islands. These are 1,190 coral islands that are formed around 26 atolls, spread over 90,000 square kilometers. Sea level has risen since 1900. Scientists predict that the rising sea levels in the future, if ignored, could bring calamity and push the population out of their homes. The Maldives government, aware of the problem, first started thinking of alternative plans in 2008, when they began to take annual tourist revenue and place it in a fund to buy what may have been new homelands, possibly in Australia, India, or Sri Lanka. Now, however, they are turning to another solution in a partnership with the Dutch Docklands company. The floating islands that they envision will rise with the sea. Instead of fighting against the sea, they will coexist. The joint venture masterplan involves over 800 hectares/ 80 million sq.ft of water with floating developments. Dutch firm Waterstudio are project designers and Dutch Docklands are the floating architecture specialists engineering the project. (Phys.org) — From tourist paradise to devastation to sustainable future, an imaginative path toward rebirth is possible for global coastal populations at risk of being wiped out by rising sea levels. That path lies in artificial floating islands. The Maldives government is in a joint venture with the architectural firm Dutch Docklands International for the world’s largest artificial floating-island project. The present phase will focus on tourism. In turn super-rich globetrotters will enjoy the high end living activities they are accustomed to without having to fear being suddenly wrapped around a pole and dying. Citation: Maldives floating island masterplan tests the waters (2012, August 12) retrieved 18 August 2019 from https://phys.org/news/2012-08-maldives-island-masterplan.html The 18-hole golf course is one of the projects being given lots of international exposure, each with two to three holes, connected by underwater tunnels. The golf course is a $500 million project, paid for by the Maldives government and private investors. Forbes has referred to it as “the floating golf mecca.”Architects today are convinced that architects of the future will want to learn more about working with water instead of against it. In the past, engineers have used sand and rubble to create islands, but these structures disturb the sea and seafloor ecosystems. © 2012 Phys.org More information: www.dutchdocklands.com/maldivesvia PopSci, Dvice, io9 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. Building-materials that the Dutch put to use include slabs of concrete and polystyrene foam. Their design concept involves foundations for buildings transformed into floats. They use a foam core encased in concrete, with steel cables securing it against the pull of potential currents. No matter how high the sea levels, the structures will remain above water. The foam core encased in concrete with steel cables all serve to prevent a structure from floating away.The Dutch company prides itself as using techniques that are environmentally friendly, or what they call “scarless” development. The design disturbs only a small patch of the seafloor, while preserving natural currents. Less space is disrupted on the sea floor with their design than if they were building with rock or sand. With sea levels rising all over the globe, scientists say it is possible that the Maldives venture could be a roadmap for future developing nations at risk. The success of this project is not yet proven but floating-architecture supporters believe it is a better concept to pursue than disbanding populations and sending them elsewhere.
Toward a low-cost ‘artificial leaf’ that produces clean hydrogen fuel More information: Liping Liu. “Feasibility of large-scale power plants based on thermoelectric effects.” New Journal of Physics. DOI: 10.1088/1367-2630/16/12/123019 Liping Liu, Associate Professor at Rutgers University, envisions that thermoelectric power plants would look like giant barges sitting in the tropical ocean, where electricity is generated by heating cold, deep water with warm, shallow water heated by the sun. Liu has published a paper in the New Journal of Physics in which he analyzes the feasibility of such power plants.”This work is about the new idea of large-scale green power plants that make economic use of the largest accessible and sustainable energy reservoir on the earth,” Liu told Phys.org, speaking of the oceans. This is because the sun heats the surface water to a temperature that, in tropical regions, is about 20 K higher than water 600 m deep. Essentially, the surface water acts as a giant storage tank of solar energy.As Liu explains, thermoelectric power plants would work by harvesting the energy of ocean waves to pump cold water from a few hundred meters deep up through a long channel. As the cold water nears the surface, it enters a heat exchanger where it is heated by surface water on the outside. The heat exchanger acts as an electric generator, as its tubes are made of thermoelectric materials that can transfer heat through their walls and directly convert temperature differences into electricity.Large-scale, ocean-based thermoelectric power plants would have many advantages. For one, the “fuel” or temperature differences are free, unlimited, and easily accessible. Also, the plants do not take up space on land. Because they have no moving solid parts, they would have low maintenance costs. In addition, the power output does not depend on the time of day or season. And finally, the method is green, as it does not release emissions. In the new paper, Liu shows that large-scale thermoelectric power plants wouldn’t need to operate at extremely high efficiencies to be economically competitive; instead, the key would lie in engineering simple structures such as laminated composites in order to support mass production. These improvements focus on the conversion capacity, which, unlike efficiency, can be improved by orders of magnitude. In other words, because the fuel is free and in limitless supply, large-scale thermoelectric power plants could make up with their sheer size what they lack in efficiency.The cost of generating electricity varies by source. According to the US Department of Energy, the estimated cost per year of one megawatt of electricity in 2016 is about $0.83 million for conventional coal plants, compared to $1.84 million for photovoltaic power plants. Liu’s analysis estimates that a thermoelectric power plant could generate electricity for less than $1.84 million, although an exact estimate is difficult at this stage. This estimate is for a thermoelectric generator that lasts for 20 years and uses ocean water with a 10 K temperature difference as fuel. If water from geothermal sources is used instead, the temperature difference could be 50 K or more, resulting in an even higher power gain and lower cost per watt.Overall, the analysis shows that thermoelectric power plants look very promising and could contribute to solving the world’s energy problems. Liu plans to work toward this goal in future research.”We are currently working on experimentally validating the predicted power factor of the thermoelectric composites,” Liu said. “Once this is validated, we will seek to fabricate a table-top prototype of the generator that uses ice water and hot water as ‘fuel.'” Citation: Thermoelectric power plants could offer economically competitive renewable energy (2014, December 19) retrieved 18 August 2019 from https://phys.org/news/2014-12-thermoelectric-power-economically-competitive-renewable.html A thermoelectric power plant can also use geothermal sources to produce the temperature gradient. Here, hot water is pumped up to the heat exchanger/generator, where it is cooled by air. Credit: Liu. (CC BY 3.0) Small-scale thermoelectric generators are already used commercially in applications such as microelectronics, automobiles, and power generation in remote areas. In these designs, the conversion efficiency is the most important factor because the fuel accounts for the largest portion of the cost. Most commercial devices have a conversion efficiency of around 5% to 10% of the ideal Carnot efficiency, with state-of-the-art devices achieving efficiencies of up to 20%. Although research is currently being done to further improve the efficiency, there are still limits to how high it can go. 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: New Journal of Physics (Phys.org)—A new study predicts that large-scale power plants based on thermoelectric effects, such as small temperature differences in ocean water, could generate electricity at a lower cost than photovoltaic power plants. A thermoelectric power plant might use energy harvested from ocean waves to pump cold water up through a heat exchanger/generator near the surface. The heat exchanger is made of thermoelectric materials which can use the temperature gradient between the warm and cold water to generate electricity. Credit: Liu. (CC BY 3.0) © 2014 Phys.org Explore further
Just a few hours away from the Capital there is a musical storm building up. Rajasthan International Folk Festival, which is among one of the biggest music fest in the world is just round the corner. Millennium Post speaks to Divya Bhatia, the director of the fest to bring you insights what to expect this year.If you are a music lover take some time out in October and drive down to attend this year’s RIFF. The fest takes place every year on Sharad Purnima, this year it will take place at Mehrangarh Ford. Also Read – ‘Playing Jojo was emotionally exhausting’What should music lovers expect this year?This year’s Jodhpur RIFF will bring together interlinked strands to create a captivating program built around the exceptional variety of Rajasthani music and countries rich tradition in percussion and the unique musical heritage of nomads. The multi-platform festival includes unique events from dawn devotional concerts to hip club nights; and exciting collaborations with musicians from across the globe.What are the key attractions of the fest this year? Also Read – Leslie doing new comedy special with NetflixOur focus on the Manganiyar community, the Gypsy Allstars, a Rajasthani percussion workshop, Manu Chao’s set, the legacy of Bhikari Thakur by Kalpana Patowary, Daud Khan master of the roabab, collaboration between an Australian and Rajasthani artists, a special performance by the Manganiyar artists among others!Tell us about the Jodhpur-RIFF from a director’s point of view?It is a dream project for anyone to do, it gives me an unusual context to work in, a wonderful vision to evolve that can be measured in decades (not years), stalwart mentors to guide, a unique city and stunning location to animate. It’s extremely challenging and therefore very satisfying if done well. Most of all, work with and for some of the best musicians in the world. Arranging the whole fest is a difficult task would you like to share any good/bad incidences that have taken place during the process?They have been mostly good. Being invited to present legendary folk musicians at the Edinburgh International Festival and the visit of the Scottish Foreign Minister to RIFF last year; facilitating and enabling the collaboration with Dharohar project and Mumford and Sons and the royalties to the folk artists after that; being on a list of best international festivals for four years in a row.Tell us more about the documentary Bidesia in Bambai?Bidesia in Bambai is an unusual film by film maker Surabhi Sharma – about the mobile culture, migration to Mumbai and Bhojpuri music in the city. Surabhi’s explorations are postmodern and they provide a perfect counterpoint to our presentations of pure folk, while opening new spaces for dialogue on modernity and folk music.
Time for some great tricks on stage as the Capital gears up for a festival of magic and magicians. Get the kids together and pencil this day in the calender and pack a picnic – it might just be the next best thing to do over the coming weekend. Magicians from all around the country will soon come together at Dilli Haat, Pitampura to exhibit their skills at the 3rd International Magic Festival. The event is being organised by Delhi Tourism. The highlights of the festival would be shows of illusion, sleight of hand, mind reading, theme based drawing competitions, fancy dress competitions and interactive sessions on magic, street magic shows and stand up magic shows. Also Read – ‘Playing Jojo was emotionally exhausting’The festival will also see magicians from Malaysia, Poland, Mauritius, Sri Lanka and India. Famous magicians like Jakub from Poland, Rajah and Natalie from Mauritius, Emil Eranga from Sri Lanka, Quest Group from Malaysia, David from Kolkata, Rakesh Kumar from Punjab and Suraj from West Bengal will also participate in the event.When: 27-29 September, 11 am to 9 pmWhere: Dilli Haat, Pitampura
Kolkata: State-run BEML Ltd, the leading manufacturer of Rail and Metro coaches, remains focused on the Mumbai-Ahmedabad bullet train project as “some indigenisation” is expected, an official said on Friday. “Whatever I understand, a total of 240 coaches would be inducted by 2023 (for the project). Of this, some numbers would be assembled (in India). Initially, I believe it is better to absorb the technology. Some particular indigenisation will happen and that has not been decided,” said the company’s Chairman and Managing Director D.K. Hota. Also Read – Heavy rain hits traffic, flightsThe Mumbai-Ahmedabad High Speed Train Project, popularly referred to as Bullet Train, is an endeavour to bring economic growth and prosperity with the Indian Railways adopting the most modern technologies.”As and when the opportunity comes and particularly, when it comes to us contractually, we would invest. There are various Japanese companies which would primarily be there and we would be talking to them,” he said on the sidelines of a programme “Rail connect east, 2018”. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedThe programme was organised by the Confederation of Indian Industry in partnership with the Research Design and Standards Organisation (RDSO) and Indian Railways.According to him, BEML has tied up with Japanese company Hitachi. Another public sector undertakings, BHEL Ltd, has tied up with Kawasaki.Hota said: “The government is extremely serious (on the high speed train project) and a lot of ground work has happened. Whatever part (of the project) comes out for bidding, we would bid and try to get order. “We have to be in sync with the government plans… We have the capacity to absorb the technology,” he said.The state-run company also sees opportunities in various metro projects and intends to become a turnkey player.”Some of the metro corporations are looking at totally lease base model as resources are becoming a constraint. We are also looking at options where we will not only be a rolling stock supplier but also aspiring to form consortium with construction companies to become a turnkey player. This will help metro rail corporations to do infrastructure projects much faster,” Hota said.According to him, the company manufactured 1,200-1,300 metro coaches, which is about 47 per cent of the coaches manufactured in the country.”At the moment, we are making 150 coaches for the Bengaluru Metro… We will be sending 72 metro cars to Kolkata Metro,” he said.There has been a proliferation of metros in various cities. Each metro corporation has its own standards, he said.”Attempts are now being made to standardise (different standards). There would be some meetings soon,” he added.
Juvenile Justice Boards are set to a play major role in effective implementation of provisions of the Juvenile Justice (Care and Protection of Children) Bill, 2014, which was introduced in Parliament on Wednesday, though they have huge pendency of cases.The Bill provides that in case a heinous crime has been committed by a person aged between 16 and 18 years, it will be examined by Juvenile Justice Boards, which will have psychologists and social experts on its panel, to assess if the crime was committed as a ‘child’ or as an ‘adult’. Also Read – Need to understand why law graduate’s natural choice is not legal profession: CJIAccording to government data, as many as 45,258 cases were pending before 612 Juvenile Justice Boards (JJBs) in the country and 8,210 cases in 626 Child Welfare Committees (CWCs) till September 2014.Delhi has maximum number of pending cases of 1,759 in the CWCs, followed by Rajasthan (1,657), Kerala (992), Tamil Nadu (818) and Chhattisgarh (663). While many states have district- wise CWCs and JJBs, Delhi has seven CWCs and two JJBs for its nine districts and Chhattisgarh 17 JJBs in 27 districts. Also Read – Health remains key challenge in India’s development: KovindSimilarly, with 12,831 cases Gujarat has the highest number of pendency in JJBs, followed by Rajasthan (8,647), Chhattisgarh (6,840), Tamil Nadu (5,066) and Odisha (4,735).According to a parliamentary committee report, majority of child care institutions were marred by complaints of poor infrastructure and staff behaviour and high rates of abuse perpetrated by adults in child care homes and institutions.
Singapore has appointed an Indian- origin businessman as its non-Resident High Commissioner to Sri Lanka, the Foreign Ministry announced on Thursday.S Chandra Das served as Singapore’s Ambassador to the Republic of Turkey, resident in Singapore, from 2006 to 2015.He had also previously served as Singapore’s Trade Representative from 1970 to 1972 in the USSR, the former Soviet Union.Das was a Member of Parliament from 1980 to 1996 and is currently the Managing Director of NUR Investment and Trading private limited of Singapore as well as a director of a number of other companies. Also Read – Pro-Govt supporters rally as Hong Kong’s divisions deepenDas is married to Rosie Pillai and they have two children.The Ministry also announced the appointment of Chua Thai Keong as Singapore’s High Commissioner to the Republic of South Africa.Chua has previously served as Singapore’s Ambassador to the Republic of Korea (with concurrent accreditation to Mongolia) from September 2006 to December 2010 and Singapore’s Non-Resident Ambassador to Chile from April 2014 to May 2015.