Digging deep into diamonds

first_imgBy creating diamond-based nanowire devices, a team of Harvard researchers has taken another step toward making applications based on quantum science and technology possible.The new device offers a bright, stable source of single photons at room temperature, an essential element in making fast and secure computing with light practical.The finding could lead to a new class of nanostructured diamond devices suitable for quantum communication and computing, as well as advance areas ranging from biological and chemical sensing to scientific imaging.Published in the the latest editions of Nature Nanotechnology, researchers led by Marko Loncar, assistant professor of electrical engineering at Harvard’s School of Engineering and Applied Sciences (SEAS), found that the performance of a single photon source based on a light-emitting defect (color center) in a diamond could be improved by nanostructuring the diamond and embedding the defect within a diamond nanowire.Scientists, in fact, first began exploiting the properties of natural diamonds after learning how to manipulate the electron spin, or intrinsic angular momentum, associated with the nitrogen vacancy (NV) color center of the gem. The quantum (qubit) state can be initialized and measured using light.The color center “communicates” by emitting and absorbing photons. The flow of photons emitted from the color center provides a means to carry the resulting information, making the control, capture, and storage of photons essential for any kind of practical communication or computation. Gathering photons efficiently, however, is difficult since color centers are embedded deep inside the diamond.“This presents a major problem if you want to interface a color center and integrate it into real-world applications,” explains Loncar. “What was missing was an interface that connects the nano-world of a color center with the macro-world of optical fibers and lenses.”The diamond nanowire device offers a solution, providing a natural and efficient interface to probe an individual color center, making it brighter and increasing its sensitivity. The resulting enhanced optical properties increase photon collection by nearly a factor of ten relative to natural diamond devices.“Our nanowire device can channel the photons that are emitted and direct them in a convenient way,” says lead author Tom Babinec, a graduate student at SEAS.Further, the diamond nanowire is designed to overcome hurdles that have challenged other state-of-the-art systems — such as those based on fluorescent dye molecules, quantum dots, and carbon nanotubes — as the device can be readily replicated and integrated with a variety of nano-machined structures.The researchers used a top-down nanofabrication technique to embed color centers into a variety of machined structures. By creating large device arrays rather than just “one-of-a-kind” designs, the realization of quantum networks and systems, which require the integration and manipulation of many devices in parallel, is more likely.“We consider this an important step in enabling technology towards more practical optical systems based on this exciting material platform,” says Loncar. “Starting with these synthetic, nanostructured diamond samples, we can start dreaming about the diamond-based devices and systems that could one day lead to applications in quantum science and technology as well as in sensing and imaging.”Loncar and Babinec’s co-authors included research scholar Birgit Hausmann, graduate student Yinan Zhang, and postdoctoral student Mughees Khan, all at SEAS; graduate student Jero Maze in the Department of Physics at Harvard; and faculty member Phil R. Hemmer at Texas A&M University.The researchers acknowledge the following support: Nanoscale Interdisciplinary Research Team (NIRT) grant from National Science Foundation (NSF), the NSF-funded Nanoscale Science and Engineering Center at Harvard (NSEC); the Defense Advanced Research Projects Agency (DARPA); and a National Defense Science and Engineering Graduate Fellowship and NSF Graduate Fellowship. All devices have been fabricated at the Center for Nanoscale Systems (CNS) at Harvard.last_img read more

Our politicians have failed Kiwi kids by not restricting access to online porn

first_imgStuff co.nz 4 September 2020Family First Comment: “Ignorance of what can actually be seen very easily online is a major barrier to those of us who are calling for change. We are not talking nudity here, nor even sex really. We are talking about the promotion and escalation of violence towards women. Modern pornography has become aggressive, violent and frequently demeaning to women. Forget Playboy, pornography is now a whole different beast.”And the politicians don’t seem to care You tried, Tracey.Back in June, a draft Cabinet paper asking permission for the Minister for Children, Tracey Martin, to pursue investigating internet filters to keep children from accessing pornography was rejected by her coalition colleagues.She wanted to look into a scheme whereby pornographic material is screened out on all wifi connections unless an adult opts out. There will now be no time for anything to be done in this area in this parliamentary term.Minister Martin has been vocal in her determination to make in-roads in this area. She was “very disappointed” by the reaction.I am disappointed too, Tracey.In the online world we have not placed any restriction on the age porn can be viewed, either accidentally or on purpose. Rectifying this would bring porn into line with other products we believe to be harmful to children, such as tobacco and alcohol.An important omission which needs to be corrected? Apparently not.Ignorance of what can actually be seen very easily online is a major barrier to those of us who are calling for change. We are not talking nudity here, nor even sex really. We are talking about the promotion and escalation of violence towards women.Modern pornography has become aggressive, violent and frequently demeaning to women. Forget Playboy, pornography is now a whole different beast.It is difficult to pin down exact statistics about aggression in porn, because in some research, a behaviour is not listed as violent if the female actor responds favourably to it.The problem with that criteria is that female porn actors are paid to react positively to acts which in real life would be painful, distressing and cruel.For young women who watch porn to find out how sex works, which we know they do, this is literally teaching them to smile at their own abuse. It is setting the bar for male behaviour towards women in a sexual encounter so low we might as well get out a shovel and dig it underground.Minister Martin is not the only person worried about the effects viewing this material is having on our young people who are trying to figure out how sexual relationships work.The Commissioner for Children, Andrew Becroft, has voiced trepidation about what is now facing young people online.“To be honest, in the two years I’ve been in this role, pornography is the most significant underlying concern reported to me by youth workers, community workers and church workers engaged with young people.”The Chief Film Censor, David Shanks, has spoken out often about his concerns, for example the promotion of non-consensual behaviour seen in many videos. He is also troubled by the popularity of the “step porn” genre here, whereby sex is depicted between step parents and children, and step siblings.Shanks believed New Zealand had an opportunity, he said, to be an international leader in getting other countries to join together to force online porn sites to do more to make it harder for young people to access porn.Well, we have just blown that opportunity. Unless the Minister somehow retains her portfolio in the post-election restructuring, we have lost momentum on this.READ MORE: https://www.stuff.co.nz/national/122375375/our-politicians-have-failed-kiwi-kids-not-restricting-access-to-online-pornKeep up with family issues in NZ. Receive our weekly emails direct to your Inbox.last_img read more

Uganda Cranes coach Micho wants out

first_imgCranes coach Micho wants outKampala, Uganda| THE INDEPENDENT |  Whether he leaves or not, Milutin ‘Micho’ Sredojevich’s name will remain etched in Uganda’s football history as the coach who broke the jinx!History will state that in 1978, Uganda Cranes reached the final of the Nations Cup finals, falling to Ghana 2-0. Jimmy Kirunda and Phillip Omondi were some of the great names that Ugandan soccer would talk about for over 3 decades as players who last featured in the Nations Cup finals.For close to four decades after 1978, Cranes beat all the giants from Ghana, Zambia to Nigeria, but qualification eluded them.Uganda’s sports history will also add that FUFA presidents and coaches came and went but success remained elusive — until Lawrence Mulindwa in 2013. Then FUFA President Mulindwa, decided to bite the bullet and sack coach Bobby Williamson who had done a tremendous job with the team. In came ‘Micho’, and the rest is history.Williamson had come in to replace Csaba László, who resigned in July 2008 to go to Hearts in Scotland, despite a running contract.  Williamson had led Cranes to four CECAFA Senior Challenge Cup trophies since 2008 but failed to secure qualification to the African Nations Cup in his five-year tenure – on one occassion failing on the very final day of qualification.“FUFA hasn’t received any communication in regard to rumours that Cranes coach Micho has resigned. The Serbian is still under contract,” Federation of Uganda Football Associations FUFA said Saturday.They were reacting to stories that Micho had said goodbye after his new look Cranes had humbled South Sudan 5-1 in the CHAN tournament second leg – at the Phillip Omondi Stadium.Their next opponents – Rwanda.Micho has handled Rwanda before as well.Micho went via St.George in Ethiopia, Orlando Pirates in South Africa and Rwanda before coming to Uganda.  He has complained for years about failure by FUFA to pay his salary under the agreed contract.FUFA issued a statement Saturday night talking of a meeting with the national coach on Monday, but, another mutual separation seems to be in the pipeline. Share on: WhatsApp *****FROM THE ARCHIVESlast_img read more

Column: The short, sad life of Tommy Morrison

first_imgby Tim DahlbergAP Sports ColumnistLAS VEGAS (AP) – Tommy Morrison was just a few hours away from a comeback bout that was supposed to lead him to Mike Tyson when he got the news inside the crowded casino at the MGM Grand hotel.Chances are he already knew what was coming. A few days earlier he had refused to take a blood test mandated by Nevada boxing authorities, citing religious objections. He took it only after being told that without it he would not fight.Morrison had tested positive for the HIV virus. Instead of fighting for the heavyweight title, he would now be in for the fight of his life.It seemed impossible. The blonde Adonis who had beaten the fearsome George Foreman for the heavyweight title and starred with Sylvester Stallone in “Rocky V” was too fit, too strong, to carry the dreaded virus. Magic Johnson testing positive a few years earlier was shocking enough, but now a heavyweight contender with HIV, too?Morrison quickly got on a plane back to his native Oklahoma. The fights that night went on without him, and the crowd booed when told he wasn’t fighting for undisclosed medical reasons.Morrison would end up living another 17 years before he died Sunday night in a Nebraska hospital at the age of 44. But life as he knew it was over.There would be no Tyson fight. No more multimillion dollar paydays. No more movies with Stallone.“This is not a death sentence, by any means,” he insisted a few months later.But for the troubled Morrison, it was. He spent much of the remainder of his life in a fog of drugs and denial. Occasionally he would resurface, like he did in 2007 when he tried to resurrect his boxing career at the age of 38 in a fight for a few hundred dollars at a racetrack in West Virginia.He had once blamed his HIV diagnosis on a fast and reckless lifestyle. Now he made an even more outlandish claim – that he never had the virus.“The bottom line is we passed every test on the market, even one they don’t have on the market,” Morrison told me a few days before the fight in West Virginia. “That tells me it was never there.”Drugs and denial. They combined to kill Morrison just as surely as the HIV he claimed he never had.A few weeks ago, his mother told an ESPN.com writer that Morrison still believed he never had the virus. But she said he had full-blown AIDS and she was hoping that he would die peacefully.He had long since blown through the estimated $16 million he made in the ring, long since given up on the idea of fighting again. Life wasn’t a Rocky movie, and there would be no miracle saving him at the end.Twenty years earlier, his future seemed to have no limit. With flowing blonde hair, a chiseled body and a powerful left hook, he was a star in the heavyweight division, carefully guided by promoter Bob Arum into a title fight with George Foreman.“If I don’t win,” Morrison says, “people will throw me in the heap with Duane Bobick, Jerry Quarry and Gerry Cooney. As a white fighter, you get twice as much criticism. You have more to prove than black or Hispanic fighters.”But on June 7, 1993 he did win, outboxing Foreman with a smart and disciplined game plan that took Foreman’s vaunted power away. Boxing had a fresh young star, and he was welcomed back to his hometown of Jay, Okla., with a huge sign near the country store proclaiming the town the birthplace of the heavyweight champ.But “The Duke” – he claimed a distant kinship with John Wayne – would get knocked out in the first a few months later by Michael Bentt in a homecoming bout in Tulsa. He took a bloody beating from Lennox Lewis two years later, but signed with Don King and was being groomed for a fight with Tyson when he was given a tuneup fight against journeyman Art Weathers in February 1996.Nevada was one of the few states testing for HIV at the time, and Morrison was sent to a doctor for a prefight physical and blood test. State boxing officials weren’t sure why he didn’t want his blood taken, only that he would not be allowed to fight unless it was.The positive test stunned boxing, a sport that was especially vulnerable to HIV transmission because of close proximity of fighters to each other and the very real possibility of cuts and blood mixing. Mills Lane, who refereed Morrison’s bloody fight with Lewis a few months earlier, got himself tested the day after Morrison’s result was announced to make sure he hadn’t gotten the virus from Morrison’s blood.Magic Johnson called Morrison a few days later, urging him to stay upbeat and fight the disease. Johnson said Morrison was listening, but he wasn’t sure he had heard.The folks in Jay, meanwhile, took the big sign down. Morrison didn’t blame them, saying most people thought HIV was “a loser’s virus.”His hometown had deserted him. His career was over.The long downward spiral had begun.____Tim Dahlberg is a national sports columnist for The Associated Press. Write to him at [email protected] or http://twitter.com/timdahlberg In this June 7, 1993 file photo, newly crowned WBO heavyweight champion Tommy Morrison receives his championship belt after defeating George Foreman in Las Vegas, Nev. (AP Photo/Nick Ut, File)last_img read more

Is Adrian Peterson losing it? Admits smoking weed before 1st court appearance

first_imgThe descent of Adrian Peterson has been spectacular as it has been frighteningly fast. You want to hide your eyes and cover your ears because you don’t know what other scandal will emerge about the certain Hall of Fame superstar for the Minnesota Vikings.Adrian Peterson, the former NFL MVP who is facing child abuse charges in Texas, submitted to a urinalysis examination during his first court appearance Wednesday morning and admitted that he “smoked a little weed,” according to court documents.As a result of yet another Peterson transgression, the Montgomery County District Attorney’s office filed a motion requesting that Peterson, who is out on bail, have his $15,000 bond revoked and be arrested again due to his drug use.There is no timetable to when a ruling on the arrest will be heard in the Ninth District Court.Peterson did not speak, but his attorney, Rusty Hardin insisted that Peterson was not guilty of the charges.“He is a really good guy,” Hardin said. “He is the same guy he was before all these things started happening publicly…I urge all of you to wait. Just don’t rush to judgement.”Peterson, 29, was arraigned on charges of abusing his his 4-year-old-son but did not enter a plea becuase prosecutor Brett Ligon requested that Judge Kelly W. Case remove himself from the case because Ligon alleged that Case referred to Peterson’s defense attorney, Rusty Hardin, and Ligon as “media whores.”Peterson’s trial is tentatively schedule to commence on Dec. 1.Peterson has not played for the Minnesota Vikings since the season opener. The Vikings placed him on the commissioner’s exempt list, meaning that he was barred from all team activities, including games. He is still being paid his $11 million salary for the season.last_img read more

Watch: Sadio Mane FURIOUS with Mo Salah after the Egyptian refuses to pass the…

first_imgAdvertisement uNBA Finals | Brooklyn Vs9zbWingsuit rodeo📽Sindre Eiem( IG: @_aubreyfisher @imraino ) 50w74gWould you ever consider trying this?😱2wddCan your students do this? 🌚3s7kRoller skating! Powered by Firework Liverpool remain on the top of the table with 3 more points last weekend , which marks the 4th consecutive win in their winning run. Eventhough Liverpool were comfortable against Burnley, their forwards seemed extremely agitated.Advertisement Sadio Mane , after coming off , looked absolutely flustered and angry. On further investigation, it is believed that the Senegalese International got mad at his teammate Mo Salah who instead of making a clear cut pass to Mane went for a skill to beat his man.Advertisement Watch Mane’s unique reaction here :Advertisement  “Sadio Mane is an emotional guy, we are all individuals,” Klopp told Sky Sports after the match.“Something went not like he wanted, it is not the substitution. We will clarify it in the dressing room.” Advertisementlast_img read more

Small Steps To Eliminate Hunger In Our Schools

first_imgBy John BurtonMIDDLETOWN – For the community at large, hunger can be silent, unseen, but still very much a part of the community. But it is very much something that affects lives and has to be addressed.So found out Keith and Suzanne Dice, a young Middletown couple who have been taking steps to deal with hunger and food insecurity establishing a program they call the Backpack Crew.The couple has been working as a ministry of the United Methodist Church, 247 Broad St., Red Bank, with the church’s support and assistance.The Backpack Crew currently fills 25 packs with mostly non-perishable, nutritious foodstuffs (plus some durable fruits and vegetables), delivering them to an unidentified township primary school. The idea, they explained, is to make available the food for the weekend for students enrolled in the free and reduced cost lunch program and their families, to ensure they have enough to carry them through when the kids are not in school.The couple declined to identify the school to preserve the families’ confidentiality.The idea arose when the Dices were talking to a family friend, who teaches at the school, who told them about families still struggling a year after Sandy. Starting the program in Oct. 2013 they were quickly struck by how prevalent the problem is in their suburban area. They modeled their program on one established in North Carolina.“The face of a hungry person is not what most people would picture,” Suzanne said.“First of all we couldn’t believe it was here in our area,” Keith acknowledged. “It surprised me and once we found out about it we knew something had to be done.“Originally we said if no one was willing to do this we’ll do it ourselves,” Keith continued.Suzanne and Keith each week bring the backpacks, which are numbered, to the school, with the school nurse distributing them to the children on a Friday, with the kids returning the packs on a Monday, the Dices explained.Keith and Suzanne approached their church leaders about coordinating their efforts, getting assistance in collecting food. “We couldn’t do it without the church’s help and support,” Suzanne said.Church representatives have recently dedicated a room at the church to store the collected food centralize the program.Suzanne and Keith have also set up some food collection boxes in Middletown and Atlantic Highlands to add to what is available for distribution.Hunger in the abstract is an insurmountable problem, of course. But the Dices believe that with many making small steps it can be solved.“We can’t eradicate hunger ourselves,” Suzanne acknowledged. “But we would be more than happy to help start up our program elsewhere.”“I truly believe there is enough food to go around,” she continued. “It’s about connecting people to the food.”Keith and Suzanne don’t have any direct contact with the children and families who get the backpacks and food. But they do get notes families leave in the packs, offering their thanks for what the couple’s efforts mean to them.“That makes it all worthwhile,” Suzanne acknowledged.For more information about the Backpack Crew or to offer support, visit www.backpackcrew.com; www.facebook.com/thebackpackcrew.Contact John Burton at [email protected] or at 732-219-5788.last_img read more