Monthly Archives: August 2019

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first_img The solar minimum at the end of each 11-year solar cycle is characterized by a reduction in the number of sunspots, flares, and other solar activity. The most recent, from 2008 to the beginning of 2009, lasted fifteen months longer than expected.The study used 13 years’ worth of results from SOHO, the Solar and Heliospheric Observatory, which was launched jointly by the European Space Angency and NASA. Among the data gathered by SOHO are measurements of the ionized gases moving from the sun’s equator to the poles in what is known as the meridional flow. The scientists then tried to correlate the flow with variations in the sunspot cycle.The researchers, Lisa Rightmire of the University of Memphis, Tennessee, and David Hathaway of the Marshall Space Flight Center in Huntsville, Alabama, found the normally slow meridional flows started to speed up a few years before 2008, when the number of sunspots declined. In the previous solar minimum the speed was around 30 kph, but in 2008-9 was about 47 kph. The scientists suggest the solar minimum was longer than usual because the magnetic fields produced by the gas flows at the poles were weaker, but it is not known why the speed of the meridional flow increased.Hathaway said the meridional flow carries with it magnetic fields that oppose the flows of strongly magnetized material on the solar surface. When the meriodional flow is faster the opposition to the other flows is greater and the polar magnetic field cannot become as strong as it otherwise would, and this may have delayed the start of the current solar cycle that began in 2009. Hathaway said the strength of the magnetic flow at the poles is critical since the magnetic fields fall below the surface and set up the conditions for sunspots, and when the fields are weaker they take longer to reach the required strength to produce sunspots. Hathaway and Rightmire also predict the current solar cycle is likely to have less solar activity than the previous cycle.The results of the study, published in Science, may improve the forecasting of the duration and intensity of solar cycles in the future, and this could be valuable since some solar activity can create magnetized clouds of charged particles that can damage orbiting satellites and disrupt power grids on Earth. Improved predictions of solar cycles could also help climate scientists with their long-term predictions. The results also suggest that models predicting that a fast meridional flow would lead to a stronger magnetic field at the poles, may have to be revised. Explore further Ulysses Flyby of the Sun’s North Pole More information: Variations in the Sun’s Meridional Flow over a Solar Cycle, David H. Hathaway and Lisa Rightmire, Science 12 March 2010: Vol. 327. no. 5971, pp. 1350 – 1352, DOI:10.1126/science.1181990 The Sun’s “Great Conveyor Belt.” The Great Conveyor Belt is a massive circulating current of fire (hot plasma) within the Sun. It has two branches, north and south, each taking about 40 years to perform one complete circuit. Researchers believe the turning of the belt controls the sunspot cycle. Image credit: NASA © 2010 PhysOrg.com Citation: Study may explain the extended solar minimum (2010, March 15) retrieved 18 August 2019 from https://phys.org/news/2010-03-solar-minimum.html (PhysOrg.com) — The recent solar minimum extended fifteen months longer than predicted, and a new study may explain why, and improve the predictions for future solar cycles. 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

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first_img Governments everywhere have begun to realize the undesirable effects of introducing non-native species, but many of the species causing problems today were introduced many decades ago. To study the problem the researchers, from a range of agencies and universities in Austria, the Czech Republic, Germany, Italy, and elsewhere, looked at data on over 3,300 invasive species in 28 European countries. The species were representatives of 10 taxonomic groups and included mammals, amphibians, birds, reptiles, fish, plants, insects, and fungi, and included species such as Canadian Geese, American Ragweed, and Japanese Deer.Individual countries in Europe have not seen the same rate of development and population growth in the last century, and the differences allowed the researchers to determine if the lag times between introduction of species and their establishment were related to socioeconomic factors. What they found was that the current numbers of alien species now established in the wild are more closely related to socioeconomic indicators such as population density, per capita gross domestic product (GDP) and level of exports of the year 1900 than to those of 2000. The researchers also found it could take decades before it became clear which species would become disruptive. The association with 1900 socioeconomic indicators was less prominent in birds, reptiles and insects that are able to disperse and colonize new areas more rapidly, but for the majority of groups the results suggested a “considerable historical legacy.”The authors speculate that the level of socioeconomic activity in a country could affect the success of an alien species through deliberate introduction efforts, but more importantly through expansions of roads and human population centers, and the conversion of natural habitats into agricultural land, which has already been shown to foster the spread and naturalization of alien species. Per capita GDP may correlate with rates of introduction.The results suggest that the effects on invasive species of the current high levels of socioeconomic activity will not be completely felt for several decades. The researchers described the delay as an “invasion debt” and said that even with existing trade and biosecurity regulations, “the seeds of future invasion problems have already been sown.” They recommended introduced species that were currently not causing problems but had been seen to be invasive elsewhere should be more strictly controlled.The scientists warned further introductions of alien species could have greater impacts on biodiversity and the economy than previously thought. They also said the threat from invasive species is among the major causes of biodiversity loss, along with habitat fragmentation and destruction. The problems are estimated to be costing $16 billion a year in Europe.The paper is published online in the US Proceedings of the National Academy of Sciences (PNAS). (PhysOrg.com) — A team of researchers in Europe has urged governments to introduce tougher controls of all international trade that could result in the introduction of non-native species. They say the full impact of alien species may not be evident for decades because they may co-exist with native species for a long time before becoming invasive. Globalization burdens future generations with biological invasions More information: Socioeconomic legacy yields an invasion debt, Proceedings of the National Academy of Sciences Published online before print December 20, 2010, doi:10.1073/pnas.1011728108 Citation: Delayed legacy of invasive species (2010, December 22) retrieved 18 August 2019 from https://phys.org/news/2010-12-legacy-invasive-species.html Explore further © 2010 PhysOrg.com This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Canada goose. Image credit: Wikipedia.last_img read more

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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. More information: The discovery of tidal tails around the globular cluster NGC 7492 with Pan-STARRS1, arXiv:1705.04324 [astro-ph.GA] arxiv.org/abs/1705.04324AbstractWe report the discovery of tidal tails around the Galactic globular cluster NGC 7492, based on the Data Release 1 of the Pan-STARRS 1 survey. The tails were detected with a version of the matched filter technique applied to the (g−r,r) and (g−i,i) color-magnitude diagrams. Tidal tails emerging from the cluster extend at least ∼3.5 degrees in the North-East to South-East direction, equivalent to ∼1.5 kpc in projected length. Tidal tails are thin, elongated regions of stars and interstellar gas extending into space. They are formed as a result of gravitational interactions between galaxies and star clusters. Studying tidal tails offers clues on the tides experienced by the cluster and its internal dynamics. Such studies can also reveal essential information about the evolution of a cluster and could shed new light on the lumpiness of dark matter distribution in a galaxy.To date, only a handful of clusters with tidal tails have been detected in the Milky Way galaxy. Seeking more examples of such clusters, a team of researchers led by Camila Navarrete of the Pontifical Catholic University of Chile searched for the presence of stellar tails around globular clusters located within the footprint of the Pan-STARRS1 (PS1) 3Pi survey. The survey offers multi-band, multi-epoch, precise photometry across much of the sky.By analyzing the data provided by the first telescope of the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS) program, located on Haleakala, Maui, Hawaii, the team found that a globular cluster, designated NGC 7492, has the features they were looking for. Located some 86,000 light years away from the Earth, NGC 7492 is a sparse outer-halo galactic globular cluster discovered by William Herschel in 1786. The presence of extra-tidal stellar material was suggested by previous studies and has been recently confirmed by Navarrete’s team.”We report the discovery of tidal tails around the galactic globular cluster NGC 7492, based on the Data Release 1 of the Pan-STARRS 1 survey,” the astronomers wrote in the paper.According to the study, NGC 7492 exhibits two tidal tails on either side of the cluster. These features extend in the north-south direction over approximately 3.5 degrees, which corresponds to about 4,900 light years in projected length. The authors noted that the newly detected structure resembles the characteristic “S-shaped” tidal feature found around other disrupting globular clusters, like Pal 5 and NGC 5466.Pan-STARRS observations also revealed the positions of Blue Horizontal Branch (BHB) candidate stars in the cluster. The team found that despite their overall low number density, BHBs appear to follow NGC 7492’s Northern tail, connecting its uppermost tip with the cluster itself. However, there is an observable lack of the BHB candidates on the other side of the cluster.”This perhaps is not surprising, given the low number of BHB stars expected in a given stellar population. While the spatial distribution of the possible BHB candidates is suggestive, deeper wide imaging is required to confirm (and perhaps extend) the discovery presented here,” the team concluded. Two of Milky Way’s globular clusters found to have halo stars Left: Number density of galaxies around the NGC 7492 globular cluster. Right: E(B − V ) extinction around the cluster. Credit: Navarrete et al., 2017. Explore further (Phys.org)—Astronomers have found tidal tails around a distant globular cluster known as NGC 7492. The newly discovered features could provide important information about the nature of globular clusters. The findings were presented in a paper published May. 11 on the arXiv preprint repository. Citation: Tidal tails detected around a distant globular cluster (2017, May 22) retrieved 18 August 2019 from https://phys.org/news/2017-05-tidal-tails-distant-globular-cluster.html © 2017 Phys.orglast_img read more

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first_imgThe FIFA World Cup will be starting shortly. Looking forward for this extravanganza Shangri-la’s – Eros Hotel gives all the football enthusiasts a chance to  experience the thrill by screening the live matches at the Island Bar  through wide-screen televisions and surround sound stereos in the comfort of plush surroundings while they revel bottled brews and a delectable chef’s special menu. The bar has been dressed to look like a mini football stadium, with an array of exciting customized packages alongside. Guests can choose from an exquisite selection of theme based cocktails such as Attacker (A delightful mix of Cachaca, Pernod and Pineapple Juice flavoured with cardamom served tall over shaved ice), Dribble (Concoction of Absolut Mandarin, Grand Marnier,  Orange Juice with a hint of Passion Fruit),  Goal Kick (Concoction of Vanilla Vodka , Midori  and lemonade served tall), Header (Hendrick’s Gin made interesting with a hint of mint topped up with Cucumber Juice), Back Pass (Fresh Thai  sweet basil leaves muddled with Absolut Citron shaken with lemon cello served in a chilled Martini glass), Red Card (Vodka made interesting with Disaronno, Watermelon and Almond Syrup), Corner Kick (A delightful mix of Absolut Raspberry and Cranberry Juice powered with Red Bull served over Ice). The culinary team has  crafted an inviting selection of appetizers such as Fire Roasted Sweet Bell and Goat Cheese on Herbed Focaccia with Glazed Artichokes, Marinated Boletus on Herbed Brioche, Peking Spiced Prawns and Asparagus on Lemon Tarts, Thai Spring Chicken Cigars amongst others. Guests can also enjoy specially created packages such as Golden Goal (Bucket of six Domestic Beer and a platter of ‘Bocconcini Skewers with Roma Tomatoes and Sweet Basil Dressing or Thai Spring Chicken Cigars).Where: Island Bar at Shangri-la’s – Eros Hotel When: 12 June – 13 July Price: Rs 700- 3000last_img read more

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first_imgKolkata: Some villagers at Howrah’s Uluberia fell ill after inhaling poisonous gas which leaked from a container.The incident triggered tension among locals. The gas container was kept inside a chemical go-down in Palora area of Uluberia on Sunday morning. Locals told the police that the gas container was taken to the go-down by a truck. The gas container was kept outside the go-down when it started leaking.Some of the locals felt a burning sensation in their eyes and complained serious respiratory distress following the incident. Also Read – Heavy rain hits traffic, flightsAfter being informed, police and fire brigade officials reached the spot. The police cordoned off the entire area. Senior police officers also reached the spot immediately. The fire personnel faced difficulties to reach up to the gas container due to pungent smell of the gas. A fire person also fell ill. The fire personnel later put on masks and took the gas container at a deserted place and brought the situation under control.Locals, however, alleged that fire personnel reached the spot late. The fire brigade officials initially tried to identify the leakage. After identifying the leakage, they started repairing it. A senior fire department official said leakage might have been caused when it was put on the ground from the truck or during transportation. According to preliminary investigation, the fire officials suspect that it could be Benjamin cyanide. Police held the owner of the chemical go-down for interrogation.last_img read more

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first_imgKatie Holmes and Jamie Foxx have reportedly been spending a lot of time together, but it’s nothing serious. Sources don’t expect Holmes to take things to the next level with Foxx, reports people.com. “This is not some intense romance. Jamie and Katie are friends and have been for a long time. They are two adults who are attractive and single, and so apparently conclusions will be drawn.’last_img

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first_imgA musical evening of visuals, poetry, music and songs, by the last living ghazal maestro and famed court singer of the Nizam of Hyderabad  Pandit Vithal Rao, Dakhni Urdu poetry by renowned classical vocalist Swati Srinivas, Urdu poetry and introduction by Shagufta Yasmin will be enthralling the audiences on April 8 at Fountain Lawn, India International Center.The event will be inaugurated by Janab K Rahman Saheb (former Union Minister of Minority Affairs and presently Member of Parliament Rajya Sabha) and R V Deshpande (Minister of Tourism), Roshan Baig (Minister of Infrastructure, Government of Karnataka), will grace the occasion. A walk through time in the palaces, forts and dargahs of the Bahmani Sultans of Bijapur, Bidar and Gulbarga through visuals, poetry, music and songs, by Pandit Vithal Rao, is the highlight of the evening. Urdu poetry sung by renowned classical vocalist Vidya Rao and Urdu poetry and introduction by Shagufta Yasmin will lend flavour to this celebration.When: April 8Where: Fountain Lawn, IICTiming: 6.30 – 8.30 pmlast_img read more

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first_imgKolkata: The fish loving Kolkatans have reasons to rejoice after the Kolkata Municipal Corporation (KMC) found no trace of formalin in the fish samples collected from nine fish markets in the city after a three-day drive.”We have collected as many as 18 samples of fish from nine markets in the city that includes Entally Market, New Market, Manicktala Market, Poura Parna Bithika Market in Behala, Taltala Market, Orphangunge Market in Kidderpore, Taltala Market etc. All the samples have been tested in our laboratory and we have found no trace of formalin,” Member Mayor-in-Council (Health) Atin Ghosh said. Also Read – Rain batters Kolkata, cripples normal lifeThe drive that was held on July 16, 17 and 18 covered the wholesale fish sellers and samples were picked up from Rohu, Katla and a few Bhetki variety.Ghosh, however, added that the civic body will keep an eye on the markets to ensure quality of fish varieties.”We are planning to conduct surprise drives in the wee hours and collect samples when truck loads of fish reach the markets through import,” he maintained.The drive was conducted after there were allegations of presence of formalin in the fish imported from Andhra Pradesh. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedIt may be mentioned that more than half the fish consumed in the city is procured from Andhra Pradesh.Formalin is a preservative that can lead to cancer if consumed over a period of time. The chemical can also cause nausea and other ailments in the short term.Officials of the state Fisheries department have been asked to visit wholesale markets across the city from Saturday to collect samples that will be checked.According to the state Fisheries department stats, the city alone consumes around 235 tonne of fish every day. Fish from Andhra Pradesh – mostly Rohu and Katla – accounts for around 135 tonne of the total consumption.Of around 1.73 lakh tonne of fish that Bengal imports from other states annually, Andhra accounts for around 1 lakh tonne. The Assam government had already banned sale of fish from Andhra Pradesh after lab tests detected formalin in some samples.”Banning of fish from Andhra will be difficult for Bengal. If we stop import, the deficit cannot be met by local production,” an official in the state Fisheries department said.last_img read more

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first_imgKolkata: Deployment of jalosathis at transit points of inland waterways is ensuring safety and security to commuters.It may be mentioned that the Mamata Banerjee government has taken all necessary measures to ensure the safety and security of people who travel across river Hooghly in vessels. Major steps were taken after the Telenipara incident that had claimed some lives. The state government had decided to develop jetties at the transit points following Standard Operating Procedure (SOP), to avoid any untoward incident. Also Read – Rain batters Kolkata, cripples normal lifeBesides upgrading the existing earmarked jetties, new ones were also constructed following the SOP that ensured proper illumination in the area, necessary infrastructure to check overloading of vessels, etc. At the same time, the idea was mooted to deploy well-trained persons at the jetties so that the SOPs are maintained and so, the jalosathis were posted at the jetties. The jalosathis underwent necessary training in this connection before they were posted at the jetties. Besides ensuring that passenger load of vessels is maintained and no passenger gets onto the jetty before the scheduled time, the jalosathis have also been trained to initiate rescue work in case any untoward incident takes place. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedThe jalosathis have been commissioned a blue uniform so that they can be easily identified by commuters, who can approach them for any sort of help. Commuters also feel confident in travelling in the vessels due to the presence of jalosathis at the transit points. At night, the jalosathis ensure that the area remains properly illuminated so that commuters do not face problem in getting down from vessels due to lack of sufficient light at the transit points. The jalosathis follow the orders strictly so that no overloading takes place. They also help elderly people as and when required. They also ensure that there is no rush to get onto the vessels, to prevent any accident.last_img read more

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first_imgKolkata: State Education minister Partha Chatterjee on Thursday said a top official of the state Higher Education department will visit Hindu Hostel, take stock of the work and make a decision of its opening on Monday.”Special Secretary of state Higher Education department Siladitya Basu Roy will go for inspection of the hostel on Monday morning and take necessary steps to ensure that students can lodge at the earliest,” Chatterjee said. A section of students met Chatterjee at his chamber in the state assembly on Thursday afternoon and sought the government’s intervention. “I have spoken with the engineers of the state Public Works Department (PWD) as well as the minister-in-charge. I have felt that the renovation work has been delayed due to work done in phases by the university and the deadline of November 15 set by the state government for handing over the hostel could not be met,” he maintained. Chatterjee also expressed his doubts about the seriousness of the subject on the part of the university. “The authorities could have taken up this issue with a more humanitarian outlook and at the same time a section of students should have acted with patience,” he added. It may be mentioned that Hindu Hostel remained closed since July 2015 for renovation and the boarders were provided with lodging facilities at Tarulia in New Town. The university has failed to meet deadlines on more than one occasion in case of Hindu Hostel handover. The students had resorted to agitation for a long period demanding the same.last_img read more

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