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Material gain

first_imgScientists from Harvard University and the Massachusetts Institute of Technology have developed a theoretical model of a material that one day could anchor the development of highly efficient solar panels.Traditional organic solar panels work by combining photons with light-sensitive materials, creating particles called excitons. Those particles are then channeled through the material to an interface, where they dump energy into electrons that flow along wires, producing electricity. The problem is that excitons aren’t easy to control. The particles are often trapped by defects in the material, and release their energy as light, reducing the efficiency of the panels.Inspired by cutting-edge theories in condensed matter physics and the development of quantum computers, the Harvard-MIT group used magnetic fields to force excitons to move in a specific direction, avoiding the traps that plague traditional materials. The system is described in a paper in Nature Materials.The research team was led by Professor of Chemistry and Chemical Biology Alan Aspuru-Guzik and included Joel Yuen-Zhou, a former Ph.D. student in Aspuru-Guzik’s lab who is now a postdoctoral fellow at MIT, and research associate Semion Saikin.“This effect has been identified in physics, in what’s called the quantum Hall effect, and in topological insulators, but we believe this is the first time this has been proposed in a practical way for excitons in molecular layers,” Aspuru-Guzik said. “What we wanted to ask was, can this be done in organic materials? Can you custom-tailor an organic material in such a way that, for certain excitation energies, excitons move in one direction, and when they confront obstacles, they can move around them?”Yuen-Zhou and Saikin began searching for molecules that fit a tightly defined set of criteria, and eventually settled on porphyrins, in part because they have been extensively studied.“These are just one example of a molecule that could work in this system,” said Saikin. “We don’t want to say that, experimentally, one has to do it with these molecules, but conceptually, we’ve shown that the electronic structure of these molecules is convenient for this system.”The system described in the paper, however, is about more than simply creating a film of porphyrin molecules.For the design to work, the team outlined how magnets could be used to prepare the molecules in specific quantum states to ensure they don’t interfere with one another.“In the absence of a magnetic field, it’s equally likely the excitons would go in one direction or another,” Aspuru-Guzik said. “We use some very clever quantum tricks, to ensure that, when we apply the field, one direction becomes more preferential.”Just as cars sitting in traffic on the highway are unable to turn around and drive in the opposite direction, Aspuru-Guzik said, excitons in this system are able to flow in only one direction, around the edges of the film.What’s more, Yuen-Zhou said, the quantum mechanics of the system permit a good deal of flexibility, allowing excitons to flow around defects in the material, just as a stream flows around obstructions.While it may be years before the material finds its way into commercial solar panels, Aspuru-Guzik believes it has the potential to increase their efficiency by creating a flow of excitons that moves along the panel’s interface, more efficiently transferring energy into electricity.“What we’ve done with this paper is a proof of concept, and we hope it’s the opening to a new era of excitonics.”last_img read more

Woman who breached Mar-a-Lago security seen dancing on vehicle just before

first_imgAccording to the report, the suspect, thirty-year-old Hannah Roemhild, was seen dancing on top of the rented Jeep in the parking lot of The Breakers. When Roemhild noticed that a Florida Highway Patrol vehicle was approaching her she then jumped into the jeep and put the vehicle in gear.The trooper then smashed the driver’s side window in an attempt to control the steering wheel but Roemhild was still able to drive away.She continued driving down A1A on the wrong side of the road where she eventually blew through two checkpoints leading up to Mar-a-Lago.Secret Service then fired their weapons in an attempt to stop the vehicle that was believed to be traveling at over 70 miles per hour. Roemhild was not injured but Secret Service did manage to shatter the back window of the Jeep.Authorities then pursued Roemhild down Southern Blvd but lost her when she crossed over into West Palm Beach.During that time, Roemhild is believed to have picked up another person.A trooper then located Roemhild some time later and began to pursue her. The trooper followed Roemhild to a Motel 6 off Australian Ave where Roemhild parked the vehicle and attempted to run. The trooper was, however, able to tackle her and take her into custody.During a press conference Palm Beach County Sheriff Ric Bradshaw says he believes that Roemhild may have been impaired and lost but that he does not think she had any intention of going to Mar-a-lago.She is expected to be charged with assault on a federal Officer, deadly assault on sheriff’s deputies, and other traffic charges. Authorities are now reporting that the woman who was arrested for driving through several checkpoints at Mar-a-Lago early Friday, was seen moments before dancing on top of the vehicle she was driving.Shots fired at SUV that breached security checkpoints near Mar-a-Lagolast_img read more

International field heads to Gerrards Cross

first_img Golfers from thirteen countries around the world will be competing in the English Girls’ Under 16 and Under 14 Open Amateur Stroke Play Championships at Gerrards Cross Golf Club in Buckinghamshire on the 6th to 8th of August.The draw features players from Australia, Austria, Finland, France, Germany, Ireland, Italy, Morocco, Spain, Switzerland, The Netherlands and Wales as well as from the host nation.Last year at Lyme Regis both titles went to golfers from the Continent of Europe.The Under 16 competition, which in the past has been won by 2018 Ricoh Women’s British Open champion Georgia Hall and her fellow LET members Florentyna Parker and Felicity Johnson, went to 15-year-old Finnish player Kerttu Hiltunen who swept to an 11-shot victory over England’s Ellie Gower, Rafiah Banday and Jess Baker. Banday, from Royal Mid-Surrey, returns for another tilt at the title this year.The Under 14 championship was won by 13-year-old Italian Francesca Fiorellini who succeeded compatriot Charlotte Cattaneo as champion and has since gone on to capture the R&A Girls’ Under 16 Open and represent the Continent of Europe in the Junior Vagliano Trophy.One of last year’s runners-up Anna Neumayer from Austria moves up to the Under 16 competition this year.Hall is also a former winner of the Under 14 title as are Parker, new European Ladies’ champion Alice Hewson and current English women internationals Lily May Humphreys and Samantha Fuller.The Under 16 championship is played over 72 holes with the full field playing 18 holes on each of the first two days before the leading 40% of players progress to play 36 holes on the third day. The Under 14 event is staged over 54 holes with 18 holes played on each of the three days. The leading 40% of competitors make the cut after two rounds. 31 Jul 2019 International field heads to Gerrards Cross Tags: English U14 girls’, English U16 girls’last_img read more

Sandoval lands $10,000 fish at Family Day Fishing Derby

first_imgSecond place went to David Jamieson with a 16.5 pound Rainbow with Rick Carlson finishing third.Bruce McIntosh from Genelle placed first, winning $2,000 in the Dolly competition. McIntosh landed a 14-pound Dolly.Second place went to Kirk Daley with John York taking home third.Once again this derby was a tremendous success say derby officials, far surpassing even their own high expectations. Hector Sandoval of Creston is $10-grand richer after walking away with the top prize at the Kootenay Lake BC Family Day Fishing Derby Monday.The event, hosted by Canadian Training Resources, by not only tossing out $30,000 in prizes but also donated 80 pounds of fresh fish to the local food bank in Creston.Sandoval won the top prize by landing an 18-pound (34-5/8 inches) Rainbow Trout. This year derby organizers asked fishermen to donate the fish they entered in the derby to the local food bank. Bonus prizes were given throughout the weekend including a fishing trip for two to the West Coast, a fishing trip to northern Saskatchewan, and an outboard motor as well as many smaller prizes of gift cards donated by local sponsors.To see all the prize winners go to http://www.ctrcanadaderby.com/last_img read more