The age of a supernova remnant has dropped from 10,000 years to less than 2,000 years. According to a news item on Space.com, the object RCW 86 in Centaurus has been linked to sightings by the Chinese in 185 AD, making it the oldest supernova recorded by man, taking place 1821 years ago. But astronomers thought this supernova remnant was 10,000 years old. How could the earlier age estimates be so far off? The article explains:The new age estimate matches the supernova spotted in 185 AD. But this calculation means the remnant is 8,000 years younger than previously thought. The astronomers said the difference can be attributed to the irregular shape of the remnant’s expanding bubble. Stellar wind from the progenitor star pushed some of the remnant’s gases in a certain direction, forming a dense pile. “The idea for RCW 86 is that in some regions the shock has hit this piled-up material. In those regions the shock will start moving slower,” [Jacco] Vink [U of Utrecht] said. And in other regions, the shock wave is much speedier.X-ray measurements from the Chandra X-ray Observatory were used in making the new age determination based on outflow speeds of the gas. The new estimate was about 2,000 years, within the range of the event in 185 AD.One of the captions in the article was “Shell Shocked,” but it was not clear if this referred to the supernova remnant or to the astronomers finding out how wrong they had been. In this case, we had an observation to calibrate a dating method, and the result was drastically lower than predicted from theory. There are many other things in space and time that cannot be so calibrated. The parameter to watch in dating methods is the observation-to-assumption ratio.(Visited 8 times, 1 visits today)FacebookTwitterPinterestSave分享0
Share Facebook Twitter Google + LinkedIn Pinterest In late July, President Barack Obama signed into law an important agreement that protects America’s food supply from a harmful patchwork of state-level food labeling laws. The law will provide consumers with more information than ever before and ensure a transparent, national food labeling system.“We are grateful to President Obama for swiftly signing into law a bill that is crucial for American farmers and consumers,” said Chip Bowling, National Corn Growers Association President. “His signature brings consistency to the marketplace and prevents the negative ramifications of conflicting state and national food labeling standards.” The legislation requires food packages to display an electronic code, text label, or symbol identifying whether or not they contain GMO ingredients. The exact details will be determined by the Department of Agriculture that has up to two years to write the rules for the labeling specifics.
Air sealing and pressure differencesReaders who live in Southern states will particularly appreciate Bailes’ Georgia perspective. A few samples of Bailes’ writing give a flavor of the range of his blog topics.On thermal bypasses: “In such houses, the problem results from the top of the walls being open to the attic. You can go into the attic and look down into the interior walls and see the drywall. That means that cold attic air gets down into those cavities.”On sealing air leaks: “So, before you go around caulking your windows and weatherstripping your doors, get up in your attic and seal the real leaks!”On aligning air barriers with insulation: “We’ve got 2×8 floor joists, with a depth of 7.25 in. The R-7 fiberglass batts are only about 2 in. thick. (R-7? Really?! Why bother!) You can see in the photo below that these batts don’t come anywhere close to touching the subfloor, and that’s how they’re installed in just about every cavity in this floor.”On the quality of spray foam jobs: “I’ve seen a number of houses with problems even though they’re insulated with spray foam. In order of prevalence, here are the problems I’ve seen, with explanations following the list:Spray foam isn’t thick enough.Spray foam installers missed some of the air leakage sites.Spray foam installers didn’t understand the building envelope and sprayed either too little or too much.Spray foam contracts and pulls away from framing.”On the value of measuring air changes per hour: “Infiltration occurs at the surface, not in the volume. … We need to stop talking about infiltration rates in terms of air changes per hour because there are too many problems with it. … Normalizing to volume also builds in a bias toward larger homes. Since surface area is proportional to the square of the radius and volume is proportional to the cube of the radius, the volume increases faster than the surface area as a house grows in size. So, large houses benefit when dividing by volume instead of surface area. …. It’s time to quit using ACH to talk about infiltration.”On the difficulties of measuring “natural” air changes per hour: “Pressure differences created by mechanical systems can eclipse those created by wind and the stack effect. The disconnected supply duct, the panned return, the 1,200-cfm commercial range hood with no makeup air — all these things can dwarf the effects we’re trying to capture in ACHnat.”On carpet stains: “Do you have light colored carpet in your home that has dark edges where it meets the baseboard? If so, don’t beat yourself up so much for not being a good enough house cleaner. The problem is probably in your building envelope, not your vacuum cleaner. The reason the dirt is accumulating there in the first place, you see, is that a lot of air is moving through the carpet at that point. For air to move from one place to another, two conditions must be met:A pressure difference drives air from the high pressure side to the low pressure side.A pathway allows the air to move.”On the fact that particulates piggybacking on air leaks often stain fiberglass batts: “It was really nice of the insulation manufacturers to make their products in colors that show dirt really well — white, yellow, and pink. If they made grey insulation, finding air leaks would be more difficult.”On dehumidifiers in vented crawl spaces: “No dehumidifier can dehumidify all the air in Atlanta, which is what they’re asking this little one to do because the crawl space is vented to the outside.” by Martin HolladayGBA is launching a new feature: periodic reviews of interesting blogs. To get the ball rolling, I’m recommending the Energy Vanguard blog.The author of the Energy Vanguard blog, Allison Bailes of Decatur, Georgia, is a RESNET-accredited energy consultant and trainer. He performs heat loss calculations, provides HERS rating services, and provides rater training and Energy Star training, among other services.Allison has a PhD in physics, a fact that is reflected in his approach to building science. He’s worked at a variety of jobs; at one point he worked as a contractor offering air sealing, duct sealing, insulation installation, and crawl space encapsulation services. For a few years, Bailes worked at the Southface Energy Institute as the regional manager for the EarthCraft House program. Photos illustrating leaks and problemsLike many home performance contractors, Bailes always keeps a camera handy. He has an excellent collection of photos illustrating a variety of home-performance problems, and he effectively uses those photos to clarify points made in his blogs.A tiny quibble: Bailes’ blog (like portions of the GBA Web site, it must be admitted) is a little confusing to navigate. That said, it’s well worth clicking a few links until you figure out how to find all of Bailes’ blogs.GBA highly recommends Bailes’ blog. So go visit the Energy Vanguard.To read a sample of Bailes’ writing, check out his guest blog here at GBA: Is There a Downside to Lumpy Attic Insulation?.
Though there seems to be semblance of normalcy in Darjeeling Hills on the third day of shutdown of government offices called by the Gorkha Janmukti Morcha (GJM), underlying tension is palpable with a feeling that the situation may turn volatile with slightest provocation.On Wednesday, schools, colleges and markets remained open in the hills but the sight of a few burnt cars in the narrow lanes of Darjeeling town bore witness to the violence that the hills had seen on June 8 over the demand for Gorkhaland.The threat of a complete shutdown loomed large with the GJM leadership saying that in future the agitation will not be restricted to government offices and the agitation will continue till the demand of Gorkhaland is achieved. Meanwhile, West Bengal CM Mamata Banerjee on Wednesday met Governor Keshari Nath Tripathi and informed him about the appointment of C. Murugan as the new secretary of the Gorkhaland Territorial Administration (GTA) in the backdrop of the ongoing unrest in Darjeeling hills.GJM’s appealWhile the youth wing of the GJM dared the police and the administration to stop its public rally called for Thursday following which there will be a complete shutdown in the hills, GJM president Bimal Gurung asked the tourists to leave the hills. “How can tourists stay here when the State government is behaving like a dictator. The tourists should change there vision, and understand the situation,” Mr. Gurung said.Issuing direct threat to government employees attending offices, he said the State government could only protect them in office but could not give them round-the-clock protection. “You can get jobs tomorrow also after Gorkhaland is formed but what is necessary is to fight for our community,” he said. Undeterred by the deployment of more Army and paramilitary forces, the GJM president said the State could requisition as much security forces as it want but there was no stopping the movement.Joint demandThe GJM leadership is considering the joint demand made by six political parties of the hills for Gorkhaland as a major political success. Hundreds of security personnel led by Darjeeling SP Akhilesh Chaturvedi laid siege to Kanchangunja Public School at Patleybas (With PTI inputs)
Geneva – Moroccan novelist and poet Tahar Benjelloun was made honorary chairman of Geneva’s 9th international oriental film festival, scheduled next April 4-13.Moroccan novelist and poet made honorary chairman of Geneva international oriental film festivalBenjelloun will also chair the jury of the international contest that will award gold and silver prizes. The Moroccan novelist will also give a lecture in the University of Geneva on the festival’s central theme: body representation in the Orient and in the Occident.Over one hundred movies will be screened during the festival in Geneva and Versoix (Switzerland) as well as in France.
When Ohio State junior long jumper Michael Hartfield takes off down the runway, he doesn’t merely jump — he soars. “I love long jumping,” Hartfield said. “It feels free. That’s the only way I can describe it.” Hartfield has exploded into the spotlight since his arrival at OSU. A transfer from Rend Lake junior college, located in Ina, Ill., Hartfield has already earned second-team All-American honors, yet he’s far from satisfied. Early in the season, Hartfield said he wanted to consistently hit 7.62–7.93 meters in the long jump. “The goal is still to be first-team All-American,” he said. “Hopefully get on that podium at nationals.” When Hartfield competes, he does so with passion and charisma, and those around him can’t help but notice. “Mike brings a lot of energy and fun to the team, along with a great amount of talent,” OSU junior long jumper Steve MacDonald said. “Our jump squad has become very close and we feed off each other’s strengths.” Hartfield’s pre-jump routine is almost as electrifying as the jump itself. Before each jump, Hartfield starts a steady, rhythmic clap that builds as teammates, competitors and fans join in. Then, Hartfield shoots down the runway to the rapid rhythm just before he lifts off. “It’s just something to get me hyped, you know, to get the crowd into it,” Hartfield said. “When you’re running you can hear the rhythm in the background, and one of the most important parts of your run up is having a rhythm.” His routine is working. When the track & field team traveled to Des Moines, Iowa, for the Drake Relays in late April, Hartfield finished second and set a new personal record with a jump of 7.95 meters. The jump even surprised Hartfield. “I was in shock,” he said. “One, I didn’t feel like it was that great of a jump. Two, I didn’t expect to PR because of all the traveling.” The track & field team’s journey to Iowa didn’t go as smoothly as it had hoped. “We were at the airport for 12 hours before we left, and missed our flight in Chicago,” Hartfield said. “And then had to wake up at 4 o’clock in the morning, and we didn’t get to Iowa until that day.” The Drake Relays were a high point for Hartfield in what has been an up-and-down year. For Hartfield and his family, signing at OSU was a big deal. “When I first signed Ohio State, my dad was super excited,” Hartfield said. “He always told me to stay hungry, always compete no matter what.” But, shortly after Hartfield arrived at OSU, his father passed away. Despite the loss, Hartfield has used the memory of his father as inspiration. “I’ve kind of just been living through him and doing a lot of things for him just in his name because I know that’s what he’d want me to do,” Hartfield said. “It’s a big family thing that’s really pushing me this season, and it’s going to continue to push me.” The adversity Hartfield faced helped him grow as an athlete and as a person. Following high school, academic issues forced Hartfield to make changes. “I didn’t pass the NCAA Clearinghouse regulations,” he said. “My GPA from my core classes and SAT scores didn’t meet the regulations, so I had to go get my associate’s degree first before I could go Division I.” The experience helped Hartfield get back on track. Since transferring, Hartfield has raised his GPA to a 3.4. “I just had to get serious about the books like I was about track,” he said. “Definitely was a learning experience, and I definitely matured a lot because of it.” Hartfield said he knows part of the team’s success depends on his performance. Helping the team win pushes him to give his best effort. But when it comes to success, Hartfield doesn’t credit himself. Instead, he attributes his success to the people who surround him. “Definitely the coaches and the training, and just my whole team really. My training environment from this year compared to last year in junior college is 112 percent different,” Hartfield said. “Everybody’s attitudes toward the workouts, and the equipment … all the little things, they all add up and contribute to you getting better.”
Upon the conclusion of Monday night’s NCAA men’s basketball championship game – and as an aside, thank you, Louisville, for beating Michigan – many of my fellow Buckeyes immediately flipped their internal switches to the next sport on the docket – football. In Columbus, it seems we only have three seasons: football, March Madness and spring football, and despite Ohio State men’s basketball coach Thad Matta’s best efforts, the March Madness season is usually grouped together with winter football conditioning anyway. Such is life at a university that doubles as a football powerhouse. Be honest. I know what you were doing last night. You were sitting there, watching “One Shining Moment” put a nice little bow on the basketball season while you planned your road trip to Cincinnati for this weekend’s spring football game at Paul Brown Stadium. But stop. Stop it right now. Put Urban Meyer on the backburner for – gasp – two weeks. That’s it. I understand football is awesome. I love football. I love football more than my unborn future children, who will undoubtedly be twins and will undoubtedly be named Scarlett and Grayson. I’m not telling you to forget about football. I’m not telling you to bail on the Spring Game. But I am asking you, the OSU student who is probably wearing some article of OSU-branded clothing right now as you read this, to expand your taste palette a tad. Show that Buckeye loyalty exists outside the gates of Ohio Stadium and the Schottenstein Center. Challenge yourself to use these last two weeks of school and go watch a so-called “minor” sport here at OSU. Some of you, myself included, only have two more weeks left on this campus as a student. Use it wisely. Go see student-athletes who work just as hard as our football and basketball players but who receive a fraction of the glory and recognition. Take a few hours and watch senior attacker Logan Schuss and the No. 13 men’s lacrosse team in action at Jesse Owens Memorial Stadium. Come see the No. 5 ranked men’s tennis team, led by coach Ty Tucker, play a home match. Odds are you’ll see them win, because they haven’t lost at home in a decade. Yes, a decade. Take a trip to Buckeye Field and watch sophomore pitcher Alex DiDomenico dominate some hapless batter for the softball team. Come to Bill Davis Stadium and see redshirt senior pitcher Brad Goldberg do the same for the baseball team. Support the men’s and women’s golf and track teams. Show up for women’s tennis and rowing. Men’s volleyball, too. They’re all Buckeyes. They all deserve attention. You consider yourself a big Buckeye fan, right? Prove it. OSU doesn’t just play football and basketball. Come watch some of your fellow students do what they love. Come support some athletes who compete every bit as hard as junior quarterback Braxton Miller and junior guard Aaron Craft. There are 36 different varsity teams on this campus, and they all call themselves Buckeyes. Let them know this university’s fandom runs deeper than football and basketball. They deserve it.
Antonio Valencia may likely leave Manchester United at the end of the season and is already negotiating with Inter Milan, according to reports in Italy.The approach towards the 33-year-old right-back had already been mentioned in Italy.Reports from Football Italia claims that talks over personal terms have already begun.Valencia will be a free agent when his contract at Old Trafford expires in June and he intends to walk away after 10 years at the club.Lukaku backed to beat Ronaldo in Serie A scoring charts Andrew Smyth – September 14, 2019 Former Inter Milan star Andy van der Meyde is confident Romelu Lukaku will outscore Cristiano Ronaldo in this season’s Serie A.The Ecuador international joined the Red Devils from Wigan in 2009 as a winger, but has transformed into an effective right-back.Although Manchester United do have an option to extend the contract by 12 months, it does not look as if they’re going to use it.Inter Milan are currently fighting for a place in the Champions League in the Serie A and may still qualify via the Europa League if they get their hands on the trophy.
Related Items:#legalizemarijuanaintheBahamas, #magneticmedianews Facebook Twitter Google+LinkedInPinterestWhatsApp Facebook Twitter Google+LinkedInPinterestWhatsApp#Bahamas, January 18, 2018 – Nassau – The conversation on the legalization and decriminalization of marijuana took an official form when a recent town hall meeting hosted by a CARICOM Commission sought to find out how Bahamians feel on the hot button issue. Professor Rose Marie Bell Antoine, explained that the meetings were happening in all CARICOM member states and would result in a report for the heads of government meeting in July.Perspectives were varied and included issues related to addiction, negative health reactions, positive health benefits, so called irrational treatment of users by the justice system, de-escalation of gang related crime and the potential for agri-business – all linked to marijuana. Here are just a few comments by various persons who attended the town hall meeting.“I hate the fact that people smoke cigarettes which are filled with over 500 chemicals but yet I cannot smoke a plant.”“With sound regulation there are lots of opportunities, it all depends on how the government and the private sector involve say how this should go forward.”“If they legalize it guess what, I don’t have to buy it from anybody, I have a bottle full of seeds now. What am I going to spend $5.00 for a joint for when I can grow myself a whole plant.”“It turns criminals out of our own sons, we’re turning criminals out of our own sons.”“Legalization ends the violence, what did Portugal do, Portugal legalized, the violence stopped ”“It destroys families, I don’t know if any of you have had any relatives that have been addicted.”The comments were chronicled by the panel and will be merged with other perspectives on the controversial issue, which continues to grab headlines in The Bahamas.#MagneticMediaNews#legalizemarijuanaintheBahamas
Tags Porsche Taycan on ice in Sweden Porsche Volkswagen Now playing: Watch this: Post a comment Share your voice Enlarge ImageWe’ve already taken the Taycan drifting on ice in Sweden. Now, we just can’t wait to see the darn thing without camouflage. Porsche While the Porsche Taycan electric sports car and the Volkswagen ID 3 electric mass-market hatchback have about as much in common as a tuna fish sandwich and Euler’s formula, they are still both electric cars that happen to offer reservations ahead of production. You might think the much more affordable car would garner a bit more attention than the expensive one; you might also be wrong.According to a report from German-language business newspaper Handelsblatt this weekend, Porsche board member Andreas Haffner indicated that Porsche has 30,000 orders for the Taycan already. This is a pretty large leap from the last estimate we heard in March, when Porsche said over 20,000 people had registered their interest.Consultant and analyst Matthias Schmidt pointed out in a tweet that, according to the most recent data, Porsche has more Taycan reservations than Volkswagen has reservations for the ID 3 electric hatchback. VW’s most recent deposit estimate, about 22,000, came from Jürgen Stackmann, the VW board member responsible for sales and marketing.While it might seem odd that a car with, in all likelihood, at least twice the base price will command more reservations, it makes sense. VW’s ID 3 hatchback is a mass-market vehicle, part of a giant onslaught that will feature multiple body types, and not everyone might want the ID 3 itself over, say, an ID Buzz or an ID Crozz. On the other hand, the Taycan is the first electric Porsche, which carries a bit of cachet, and Porsche fanatics and moneyed EV geeks alike are probably champing at the bit to pick a Taycan up as quickly as possible.Porsche is set to unveil the Taycan in early September. While it’s working on the frontend stuff, it’s also massively investing in its backend, throwing some 6 billion euro at its manufacturing facilities to handle Taycan production. The automaker is clearly impressed with demand for the car, as it’s already made moves to double first-year production from 20,000 cars to 40,000. With a starting price between the Cayenne and Panamera, it shouldn’t break the bank, either.(Hat tip to InsideEVs!) 0 42 Photos Ice drifting in Porsche’s all-electric Taycan 2020 Toyota 4Runner first drive: Same as it ever was — mostly 5:27 Electric Cars Sports Cars Future Cars Hatchbacks More From Roadshow 2020 Mini JCW Clubman first drive: A fast alternative for the crossover-averse Porsche Volkswagen 2020 Kia Soul review: Well-rounded box