When old stars slow down

first_imgIn the Hollywood blockbuster “Speed,” a bomb on a bus is rigged to blow up if the bus slows down below 50 mph. The premise — slow down and you explode — makes for a great action movie plot, and also happens to have a cosmic equivalent.New research shows that some old stars might be held up by their rapid spins, and when they slow down, they explode as supernovae. Thousands of these “time bombs” could be scattered throughout our Galaxy.“We haven’t found one of these ‘time bomb’ stars yet in the Milky Way, but this research suggests that we’ve been looking for the wrong signs. Our work points to a new way of searching for supernova precursors,” said astrophysicist Rosanne Di Stefano of the Harvard-Smithsonian Center for Astrophysics (CfA).The specific type of stellar explosion Di Stefano and her colleagues studied is called a Type Ia supernova. It occurs when an old, compact star known as a white dwarf destabilizes.A white dwarf is a stellar remnant that has ceased nuclear fusion. It typically can weigh up to 1.4 times as much as the sun — a figure called the Chandrasekhar mass after the astronomer who first calculated it. Any heavier, and gravity overwhelms the forces supporting the white dwarf, compacting it and igniting runaway nuclear fusion that blows the star apart.There are two possible ways for a white dwarf to exceed the Chandrasekhar mass and explode as a Type Ia supernova. It can accrete gas from a donor star, or two white dwarfs can collide. Most astronomers favor the first scenario as the more likely explanation. But we would expect to see certain signs if the theory is correct, and we don’t for most Type Ia supernovae.For example, we should detect small amounts of hydrogen and helium gas near the explosion, but we don’t. That gas would come from matter that wasn’t accreted by the white dwarf, or from the disruption of the companion star in the explosion. Astronomers also have looked for the donor star after the supernova faded from sight, without success.Di Stefano and her colleagues suggest that white dwarf spin might solve this puzzle. A spin-up/spin-down process would introduce a long delay between the time of accretion and the explosion. As a white dwarf gains mass, it also gains angular momentum, which speeds up its spin. If the white dwarf rotates fast enough, its spin can help support it, allowing it to cross the 1.4-solar-mass barrier and become a super-Chandrasekhar-mass star.Once accretion stops, the white dwarf will gradually slow down. Eventually, the spin isn’t enough to counteract gravity, leading to a Type Ia supernova.“Our work is new because we show that spin-up and spin-down of the white dwarf have important consequences. Astronomers therefore must take angular momentum of accreting white dwarfs seriously, even though it’s very difficult science,” explained Di Stefano.The spin-down process could produce a time delay of up to a billion years between the end of accretion and the supernova explosion. This would allow the companion star to age and evolve into a second white dwarf, and any surrounding material to dissipate.In our Galaxy, scientists estimate that there are three Type Ia supernovae every thousand years. If a typical super-Chandrasekhar-mass white dwarf takes millions of years to spin down and explode, then calculations suggest that there should be dozens of pre-explosion systems within a few thousand light-years of Earth.Those supernova precursors will be difficult to detect. However, upcoming wide-field surveys conducted at facilities like Pan-STARRS and the Large Synoptic Survey Telescope should be able to spot them.“We don’t know of any super-Chandrasekhar-mass white dwarfs in the Milky Way yet, but we’re looking forward to hunting them out,” said co-author Rasmus Voss of Radboud University Nijmegen, the Netherlands.This research appears in a paper in the Sept. 1 issue of The Astrophysical Journal Letters and is available online. Authors are Di Stefano (CfA), Voss (Radboud University Nijmegen, the Netherlands), and J.S.W. Claeys (Universiteit Utrecht, the Netherlands).last_img read more

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Reported cure of HIV-infected child generates widespread interest, hope

first_imgThe news that a child in Mississippi has apparently been cured of HIV infection has generated widespread interest and cautious optimism among AIDS researchers. The child—born to an untreated HIV-positive mother—was started on an aggressive combination of anti-AIDS drugs just 30 hours after birth. After about 18 months, the mother stopped giving the child the anti-AIDS drugs, but when the child was examined five months later, no functioning virus was found.If the results hold up to scrutiny, it’s significant, Harvard School of Public Health (HSPH) professor of the practice of public health Richard Marlink told Voice of America on March 4, 2013.“It’s a big deal to show that, if we really hit the virus hard right at birth, perhaps, for those babies that might be getting infected at that early time in their life, we may be able to eliminate the virus from their system,” said Marlink, executive director of the HSPH AIDS Initiative. He said the impact could be especially great in sub-Saharan Africa, where most of the roughly 300,000 children born with HIV each year live. Not only could the treatment save lives, he said, but “we wouldn’t have to be treating them the rest of their life.”Read the Voice of America article Read Full Storylast_img read more

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Jamestown Board of Public Utilities Warn Of New Phone Scams

first_imgStock Image.JAMESTOWN – The Jamestown Board of Public Utilities are warning its customers of recently reported phone scams.In the first scam, BPU officials say someone calls offering the customer rebates and, in order to receive it, the customer must supply personal and bank information.In the second scam, the caller says they are from the “electric company” in Jamestown and offers 30% off rates.The company says neither of these scams are legitimate calls and customers are warned not to give personal information over the telephone. Share:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to email this to a friend (Opens in new window)last_img

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Curious Incident Tops 2015 Outer Critics Circle Awards

first_img View Comments The Curious Incident of the Dog in the Night-Time was the big winner of the 65th annual Outer Critics Circle Awards, picking up five, including Outstanding New Broadway Play. An American in Paris won Outstanding New Broadway Musical and garnered four in total. Both Broadway-bound Hamilton and The King and I received three, including Outstanding New Off-Broadway Musical and Outstanding Revival of a Musical, respectively. The Awards ceremony will tak place on May 21 at Sardis, with Michael Cerveris, Nick Cordero, Raúl Esparza, Katie Finneran, Montego Glover, William Ivey Long and Jefferson Mays serving as presenters. The Outer Critics Circle is an organization of writers and commentators covering New York theater for various out-of-town media outlets.The winners are as follows:Outstanding New Broadway PlayThe Curious Incident of the Dog in the Night-TimeOutstanding New Broadway MusicalAn American in ParisOutstanding New Off-Broadway PlayBetween Riverside and CrazyOutstanding New Off-Broadway MusicalHamiltonOutstanding Book of a Musical (Broadway or Off-Broadway) HamiltonOutstanding New Score (Broadway or Off-Broadway) HamiltonOutstanding Revival of a Play (Broadway or Off-Broadway) You Can’t Take It With YouOutstanding Revival of a Musical (Broadway or Off-Broadway) The King and IOutstanding Actor in a PlayAlex Sharp, The Curious Incident of the Dog in the Night-TimeOutstanding Actress in a PlayHelen Mirren, The AudienceOutstanding Actor in a MusicalRobert Fairchild, An American in ParisOutstanding Actress in a MusicalKristin Chenoweth, On the Twentieth CenturyOutstanding Featured Actor in a PlayRichard McCabe, The AudienceOutstanding Featured Actress in a PlayAnnaleigh Ashford, You Can’t Take It With YouOutstanding Featured Actor in a MusicalAndy Karl, On the Twentieth CenturyOutstanding Featured Actress in a MusicalRuthie Ann Miles, The King and IOutstanding Director of a PlayMarianne Elliott, The Curious Incident of the Dog in the Night-TimeOutstanding Director of a MusicalChristopher Wheeldon, An American in ParisOutstanding ChoreographerChristopher Wheeldon, An American in ParisOutstanding Set Design (Play or Musical) Bunny Christie, The Curious Incident of the Dog in the Night-TimeOutstanding Costume Design (Play or Musical) Catherine Zuber, The King and IOutstanding Lighting Design (Play or Musical) Paule Constable, The Curious Incident of the Dog in the Night-TimeOutstanding Solo Performance Jim Dale, Just Jim DaleJohn Gassner Award (Presented for an American play, preferably by a new playwright)Ayad Akhtar, The Invisible HandShows with three or more wins:The Curious Incident of the Dog in the Night-Time – 5An American in Paris – 4Hamilton – 3The King and I – 3Disgraced, Fun Home and Hand to God received nominations and/or awards from Outer Critics Circle in previous seasons and therefore were not considered for this year.last_img read more

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$3.3 million in stimulus funds targeted for Vermont forest projects

first_imgSenators Patrick Leahy (D-Vt.) and Bernie Sanders (I-Vt.) and Congressman Peter Welch (D-Vt.) announced today nearly $3.3 million in federal economic recovery funding for Vermont’s Green Mountain National Forest.  This federal support will help create good-paying jobs while preserving Vermont’s natural resources.The Green Mountain National Forest will receive $1.4 million to address a backlog of trail maintenance projects, $657,000 for work on existing recreation facilities, and $1.2 million to restore two dams that retain Lefferts Pond in the town of Chittenden.  The Green Mountain National Forest is partnering with the Vermont Youth Conservation Corps, Green Mountain Club and Vermont Association of Snow Travelers in these projects.Approximately 40 young adults and professionals will be put to work across the state over the next two years to address the approximately 627 miles of hiking, skiing, biking, equestrian, and snowmobile trails in need of maintenance.  The forest service expects to work toward replacing restroom facilities, repairing damage from the August 2008 flooding, and rehabilitating the historic Stratton Mountain caretaker’s cabin and fire tower.  Source: Senator Sanders’ office. WASHINGTON, July 24, 2009 –last_img read more

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Colombian President-Elect Receives Certification, Prepares for Inauguration

first_img Colombian president-elect Juan Manuel Santos received certification Monday as the country’s next president, an office he will take up on Saturday with the challenge of repairing relations with Venezuela and moving forward on decisive social reforms to reduce unemployment and poverty. The fifty-eight-year-old political leader will replace President Alvaro Uribe, who is leaving office after eight years characterized by the fight against leftist guerrillas and drug trafficking, a fight that Santos promised to continue. The politician said that with the delivery of the certification by the election authorities, he now considers himself formally president of Colombia. “A simple ceremony, but one that commits me enormously to respect for our institutions (…) and to the Colombian people; we received more than nine million votes, a very clear mandate that obligates us to fulfill it,” the president-elect said at the ceremony at which he received the document. Santos will take office on Saturday in historic Bolívar Square, in the center of Bogotá, amid a heavy security deployment including air patrols and snipers, according to the armed forces. The political leader, a former minister of defense, treasury, and foreign trade, has the support of investors and businesspeople who have confidence that he will provide continuity to the government’s free-market and security policies. Santos, elected with the highest number of votes in the country’s history, has solid congressional support and a reduced opposition, a decisive factor for obtaining the approval of significant reforms, including one that seeks to guarantee and improve Colombians’ health-care coverage. One of the sensitive issues that he will have to confront in his first days in office will be trying to reestablish diplomatic and trade relations with Venezuela. By Dialogo August 03, 2010last_img read more

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American Air Forces Fight Climate Change

first_imgBy Julieta Pelcastre/Diálogo April 24, 2017 The XXIV Operations Committee of the System of Cooperation Among the American Air Forces (SICOFAA, per its Spanish acronym) was held March 6th–9th with the goal of organizing cooperative strategies and coordinating a combined exercise that will focus on disaster situations in Chile. The event was held at the Air Combat Command No. 5 of the Colombian Air Force (FAC, per its Spanish acronym) in Rionegro, department of Antioquia. Delegations from the air forces of Argentina, Bolivia, Brazil, Canada, Chile, Ecuador, the United States, Honduras, Mexico, Panama, Peru, the Dominican Republic, and Uruguay attended the event. “The main objective [of the meeting] is to exchange experiences, knowledge, and training with the goal of raising the capacities of air forces in the Western Hemisphere, to ensure the success and security of combined operations during natural disasters and emergencies in support of the civilian population,” Major General Tadeo Borbón, chief of air operations for FAC, told Diálogo. Results During the event, SICOFAA member countries agreed that Exercise Cooperación (Cooperation) V will be held in Chile from September 26th to October 7th. More than 210 officers and specialists from the 20 nations comprising the apolitical organization will participate in the event, as well as 23 aircraft. The hypothetical scenario will involve an earthquake, a tsunami, a volcanic eruption, and the capsizing of a cruise ship transporting 5,000 passengers. “Thirteen countries expressed their commitment to participating, which could make it the largest cooperation exercise to date,” U.S. Air Force Colonel Anthony G. Cook, secretary general of SICOFAA, told Diálogo. Within the strategic planning project for the training in Chile, the air forces will conduct search-and-rescue and parachuting missions, air drops, aeromedical evacuations, passenger and cargo transport missions, and operations on semi-prepared airstrips. “The joint exercises help standardize procedures and increase the synergy among partner nations. Air forces learn from each other and leadership is created. The more we become integrated and get to know each other, the better our joint operations will flow,” Maj. Gen. Borbón said. SICOFAA has also established mechanisms and strategies to strengthen the medical response during disasters. And in order to ensure the interoperability of the manifold capacities of air forces throughout the Americas, it was also able to improve transportation logistics. For example, a team of seven officers and a Black Hawk helicopter belonging to FAC will participate in the combined exercise. However, it is difficult to transfer the fully outfitted helicopter to Chile. “FAC is analyzing the possibility of transferring the aircraft on board a U.S. Air Force plane,” Maj. Gen. Borbón explained. Planning and coordinating logistics in a joint manner allows the air forces to achieve greater progress. FAC also reported in a press release that members shared knowledge in the areas of science, technology, doctrine, and advances in aerospace medicine. “The XXIV Committee served as the main planning conference for Exercise Cooperación V and it facilitated coordination among a great number of SICOFAA member air forces,” Col. Cook said. A delegation from the committee toured the National Center for Personnel Recovery in FAC’s Military Transport Air Command (CATAM, per its Spanish acronym). The center brings together Colombia’s humanitarian aid organizations and the ministries of Social Protection and Interior to optimize response time during natural disasters, the recovery and evacuation of personnel injured during combat, and medical care to victims in emergencies. Coordinated aid “None of our countries are immune to natural disasters. Cooperación V gives us the chance to meet and train together in realistic scenarios so we can be prepared to respond together when faced with such an emergency,” Col. Cook said. “During Cooperación V, we have a set of shared procedures, shared doctrine, and even shared software,” he noted. “The greater the participation, the greater our confidence in our procedures will be, and the greater our capacity to integrate our efforts in the air forces of the Americas for the fast and efficient use of air assets in response to a disaster,” he added. Because a large majority of countries in the region and around the world do not have their own capacity to respond to large-scale natural disasters like earthquakes, tsunamis, and fires, coordinated action by partner air forces – such as in Peru in March – becomes indispensable. The SICOFAA cooperation system demonstrated its usefulness during the emergency caused by the coastal El Niño, a meteorological phenomenon that battered Lima and northern Peru. On that occasion, the air forces of Argentina, Brazil, Chile, Colombia, Ecuador, and the United States joined efforts to help the victims of the heavy rainfall and flooding in Peru. “Humanitarian exercises are indispensable because they allow the hemisphere’s armed forces to adapt their operations in the fight against the effects of climate change,” César Ortiz Anderson, president of the Peruvian Association for Public Safety, told Diálogo. SICOFAA has participated in diverse combined training exercises. The most recent, Cooperación IV, took place in April 2016 at the 4th Air Brigade of the Argentine Air Force in Mendoza. On that occasion, officers from 14 partner air forces conducted virtual search-and-rescue operations and had support duties in the affected areas. “The air forces of the Americas are a huge added value for our hemisphere. We have regional stability, we share confidential information, and we maintain strong, healthy relationships,” Maj. Gen. Borbón said. “SICOFAA seeks to ensure the sovereignty of the airspace belonging to each of the territories it is composed of, to combat any transnational threat, and provide humanitarian assistance.” In response to recent disasters, SICOFAA has managed to create a sense of unity among the air forces of the Americas. “One definition of this cooperation could be ‘today for you, tomorrow for me.’ In SICOFAA we like to go further and say, ‘united allies,’” Col. Cook concluded.last_img read more

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10 awesome benefits of using a CUSO loan origination system

first_img ShareShareSharePrintMailGooglePinterestDiggRedditStumbleuponDeliciousBufferTumblr continue reading » Maximizing auto lending efficiencies with the right LOS…Is it time for you to upgrade your loan origination system?Keep reading to learn more reasons why a tried and true system can work for your Credit Union.Speed Matters More and MoreIf your members are in the market for a new car, speed matters. They’ve come to expect that loans will be processed in record time. Credit Unions are getting better at responding to Member demands, but only if the LOS makes it efficient.For your Credit Union, the faster you can process loans, the more volume you can handle.Better Member ExperienceAs the technology gets better and more accessible Member expectations get higher and higher. If you can live up to that standard, you will have loyal Members who will talk about how great your Credit Union is. Therefore, increased referral traffic which means more members.This is where a modern updated LOS can help you give Members a better experience is in managing the entire process.last_img read more

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Anthony Martial reaches Manchester United milestone with Fulham goal

first_imgAnthony Martial reaches Manchester United milestone with Fulham goal Advertisement Advertisement Anthony Martial was in blistering form for Manchester United in the first half against Fulham (Getty Images)Manchester United raced into a 2-0 lead within the opening 23 minutes of their game with Fulham at Craven Cottage with Anthony Martial heavily involved in both goals.The 23-year-old was restored to Ole Gunnar Solskjaer’s starting line-up after coming off the bench against Leicester City last weekend and wasted little time in making an important contribution, sliding a through ball into Paul Pogba to score United’s first after 14 minutes.Better was to come just seven minutes later, when Martial received a pass on the halfway line from Phil Jones before blitzing his way past Denis Odoi and Maxime Le Marchand en route to burying a calm finish beyond Sergio Rico into the far corner.AdvertisementAdvertisementIt was a wonderful individual effort from the Frenchman and a strike reminiscent of Arsenal legend Thierry Henry, not to mention Martial’s first ever goal for United against Liverpool back in September 2015.ADVERTISEMENTMore: FootballRio Ferdinand urges Ole Gunnar Solskjaer to drop Manchester United starChelsea defender Fikayo Tomori reveals why he made U-turn over transfer deadline day moveMikel Arteta rates Thomas Partey’s chances of making his Arsenal debut vs Man CityMartial has some way to emulating Henry’s 175 Premier League goals, but he did reach a significant personal milestone with his assist and goal against Fulham as they took him to 50 direct goal contributions in the competition.From his 106 Premier League appearances, Martial has scored 33 goals and registered 17 assists, more than any other United player has managed since he made his debut in that game against Liverpool three and a half years ago.Not only that, Martial’s strike also means he has matched his best-ever goalscoring season in the Premier League with nine goals with 12 games of the current campaign still to go. Pogba’s strike, meanwhile, means he has reached double figures for league goals in a season for the first time in his career.More: Manchester United FCRio Ferdinand urges Ole Gunnar Solskjaer to drop Manchester United starNew Manchester United signing Facundo Pellistri responds to Edinson Cavani praiseEx-Man Utd coach blasts Ed Woodward for two key transfer errorscenter_img Metro Sport ReporterSaturday 9 Feb 2019 1:18 pmShare this article via facebookShare this article via twitterShare this article via messengerShare this with Share this article via emailShare this article via flipboardCopy link3.2kShares Commentlast_img read more

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Ten auction results from ‘active’ weekend in Cairns

first_img Former actor’s FNQ house for sale 61A Kewarra St, Kewarra Beach went under contract to a member of the auction the following morning.These two properties at Kewarra Beach’s “millionaire’s row” were offered to buyers firstly in a two-for-one sale. Marketed as a developer’s dream or perfect for multi-generational living, 61A was ready to move in to, while 61B was the “renovator”. It was always likely the two properties would attract the interest of multiple buyers with varying views and while 61B sold under the hammer for $385,000, 61A went under contract to an auction audience member “in reserve vicinity”. 6/13-15 Harris St, Parramatta Park Last weekend Ray White Cairns Beaches was one of the busiest agencies in town with six auctions on Sunday, September 20. It sold three properties under the hammer and had entered into a contract for another after bidding ended. “We had six auctions and it was the first time this year we’ve done that many,” Ray White Cairns Beaches principal Paul Stirling said. “We’ve usually done two to four each weekend. “Every property had a registered bidder and we recorded 48 bids across six properties and that’s pretty good. “We’re coming into a very active period in the market place and there are a lot of buyers around at the moment, so to create a competitive environment for the owner. There’s no better way to sell a property. “Auctions will deliver to an owner exactly where the market is so they can make an informed decision on whether to sell or not.”This is a snapshot of the auction results across the city in the past week. 61A and 61B Kewarra St, Kewarra Beach 13 Bellevue Crescent, Edge Hill Kim Ryan and Nadine Edwards – LJ Hooker Cairns Edge Hill – PASSED IN 15 Darkin Close, Smithfield Ray White Cairns Beaches principal Paul Stirling hosts an auction via livestream. His agency had six properties listed for auction las weekend. MORE NEWS The past week was one of the busiest for auctions in Cairns in recent months. Pic: iStock.AUCTION activity across Cairns has been heating up with the past week one of the city’s busiest in recent months. As sellers look to extract the most value out of their homes during a time of high property demand and low stock, auctions are again slowly becoming a desirable method of sale, after lockdowns had led to a point where the Far North went without one for weeks at a time. In recent weeks, Cairns agents had been urging vendors to consider auctioning their property following competitive market conditions.Agents were reporting they were conducting silent auctions anyway — with multiple offers on listed properties outbidding each other and buyers missing out on homes due to the competition. Mr Stirling sold these two commercial properties under the hammer on September 20 for $831,000 and $19,500 respectively. 66 Fairview St, Bentley Park 66 Fairview St, Bayview Heights sold under the hammer for $415,000.More from newsCairns home ticks popular internet search terms2 days agoCool properties on the market in North Queensland right now18 Sep 2020Elite Real Estate Services’ Karl Latham sold this four-bedroom house under the hammer on September 19 for $415,000. Listed on the market for the first time since 1973, Mr Latham had described the 800sq m property’s shed as the most “epic” residential shed he had seen. He said the detached 150sq m shed was built like a three-bedroom house. 3 MacNamara Street Manunda Nadine Edwards – LJ Hooker Cairns Edge Hill – PASSED IN 2 Maree St, Freshwater Five Cairns ‘village’ homes This two-bedroom apartment at Parramatta Park did not sell under the hammer, but on Thursday Mr Stirling said he was expecting an offer from a person who viewed the property during the auction campaign “within 24-48 hours.” 75-77 Ardisia St, Smithfield and 6/24 Coondoo St, Kuranda Ray Murphy – RE/MAX – PASSED IN 42 Junction St, Edge Hill Cairns Property Office’s Kerry Ah Chin auctioned this three-bedroom house on September 19. And Although it was passed, it went under contract with a bidder the following morning, receiving multiple offers. 1/10 Mayton Cl, Manoora Property Shop’s Lance Richards sold this two-bedroom townhouse under the hammer on September 23 for $110,000. Its new owners are set to enjoy low body corporate fees in a quiet complex of seven properties. OTHER RESULTS Wayne Vowles – Ray White Smithfield – PASSED INlast_img read more

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