Scientists Create First Practical Artificial Leaf, Producing Power Through Photosynthesis

first_imgAddThis Sharing ButtonsShare to FacebookFacebookFacebookShare to TwitterTwitterTwitterShare to EmailEmailEmailShare to RedditRedditRedditShare to MoreAddThisMoreScientists announced they have achieved one of the “Holy Grails of science” by creating the world’s first practical photosynthesis device, an artificial leaf of playing-card-size that can be used to mimic the process that green plants use to convert sunlight and water into energy.The photosynthetic gadget, unveiled at a March 27 American Chemical Society meeting, uses sunlight to split water molecules into oxygen and hydrogen, and is reputedly 10 times more efficient than a natural leaf. Described as a milestones in the drive for sustainable energy, researchers say it will revolutionize power storage, especially in remote areas that don’t currently have electricity. “We believe we have done it,” said Daniel Nocera, Ph.D., who led the research team. “The artificial leaf shows particular promise as an inexpensive source of electricity. Our goal is to make each home its own power station.”Placed in a single gallon of water in bright sunlight, the device could produce enough electricity to supply a house in a developing country with electricity for a day, Nocera said. It does so by splitting water into its two components, hydrogen and oxygen. The hydrogen and oxygen gases would be stored in a fuel cell, which uses those two materials to produce electricity, located either on top of the house or beside it.Although they are the inspirational model for the development of this new genre of solar cells, the device bears no resemblance to natural leaves on oaks or maples. The same shape but thinner than a playing card, the device is fashioned from silicon, electronics and catalysts, substances that accelerate chemical reactions that otherwise would occur only slowly.Right now, Nocera’s leaf is about 10 times more efficient at carrying out photosynthesis than a natural leaf. However, he is optimistic that he can boost the efficiency of the artificial leaf much higher in the future.Nocera, who is with the Massachusetts Institute of Technology, points out that the “artificial leaf” is not a new concept. The first artificial leaf was developed more than a decade ago by John Turner of the U.S. National Renewable Energy Laboratory in Boulder, Colorado. Although highly efficient at carrying out photosynthesis, Turner’s device was impractical for wider use, as it was composed of rare, expensive metals and was highly unstable — with a lifespan of barely one day.Nocera’s new leaf overcomes these problems. It is made of inexpensive materials that are widely available, works under simple conditions and is highly stable. In laboratory studies, he showed that an artificial leaf prototype could operate continuously for at least 45 hours without a drop in activity.The key to this breakthrough is Nocera’s recent discovery of several powerful new, inexpensive catalysts, made of nickel and cobalt, that are capable of efficiently splitting water into its two components, hydrogen and oxygen, under simple conditions.“Nature is powered by photosynthesis, and I think that the future world will be powered by photosynthesis as well in the form of this artificial leaf,” said Nocera, a chemist at Massachusetts Institute of Technology in Cambridge, Mass.Nocera acknowledges funding from The National Science Foundation and Chesonis Family Foundation.Photo by Sun Star – Thanks to Dylan Grant for submitting the story idea!AddThis Sharing ButtonsShare to FacebookFacebookFacebookShare to TwitterTwitterTwitterShare to EmailEmailEmailShare to RedditRedditRedditShare to MoreAddThisMorelast_img read more

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NAHBS 2011 Roundup – Priority Cycles, Retrotec-Inglis and Ti Cycles

first_imgFounder Dave has a design and art background, so some of the design is for aesthetic purposes. They build with Ti because it won’t rust and is fairly indestructible, good for their hometown of Portland, OR. What Ti Cycles’ bikes lacked in total refinement they made up for with creativity. Perhaps the most shining example is their 69er double-forked mountain bike concept:The 69er is a concept bike. The long top tube lets the seat tube pierce it so there are two continuous tubes. The fork is designed to give solid control and directional stability. The triangle space frame creates stability; since the fork blades are supported by the triangulation, they could use thinner tubes. Total fork and stem weight is just a hair over 1 pound! The other half of the brand, Inglis, produces more traditional looking road bikes and such.Probably the most interesting suspension design, if that were a category, would be won by Priority Cycles. The rear triangle is closedThe design has a 2:1 ratio and all frames have 142×12 thru axles. Single Pivot design puts the pivot forward of the chainrings and low. They had a small chain demo that let you spin a crank with their design versus others and, assuming no suspension interference, demonstrated a relative lack of pedaling impact on suspension movement. The same arch is repeated on both fork crowns and on the seatstay for visual continuity. This is absolutely not the best picture to lead with, but I just had to put it first. Titanium front end, Santa Cruz Blur XC carbon rear triangle = one sweet hack. Ti Cycles put this together with their custom built front end, and wasn’t the only “different” thing in their booth.We’ve also got some crazy-linkage mountain bikes from Priority Cycles and more traditional looking fare from Retrotec-Inglis, all right behind the break… To get the belt drive into the frame, there’s a break on the chainstay just fore of the dropout. The chainstay break uses male/female tubes that carry the load, so there’s no load on the screw, which is accessible behind the the skewer’s nut (click to enlarge…it’s pretty ingenious). This was probably the cleanest frame break I saw for using a Gates drivetrain.Retrotec has this surprisingly elegant mixte step-thru bicycle alongside their usual designs.center_img This is a new frame design for them, and they’ve already made four of them. Pricing starts at $1,550 for a tig welded frame, fillet brazed is $300 more ( like shown).Retrotec’s better known for their beach-cruiser style mountain bike frames. This one’s decked out with a Shimano Alfine 11 speed internally geared rear hub and EBB. . “We’ll see if it holds up, if not I can just run it as a single speed,” said Curtis Inglis. Wheel size is 650B. Ti Cycle’s commuter bike had matching titanium racks with built-in lights, and the front rack had a nice little trick up its sleeve:U-Lock storage made super simple! The blue 29er has 5″ travel and comes in around 33pounds as shown. It has a shortish 17″ chainstay. Can be built for front derailleur or Hammerschmidt. Frames start at $1800 with shock and Maxle.The green one is made for trail riding shown is beefed up a bit for super D and has a longer fork.While the design appeared more for DH/Freeride bikes, they did have a 4″ travel XC/AM bike on display, too:last_img read more

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Maximus delivers turnover above USD100 million, launches new website

first_imgTotal revenue of USD110.8 million grew by 134 0.000000rom USD47.3 million, driven by expansion in fleet capacity and consistent dispatch reliability, says the airline. FTK flown during the year, the most important indicator of air cargo operations, grew to 347,785 – up 156 0.000000rom 135,996 in 2007. Hours flown followed a similar pattern, up 137 0.000000rom 3,687 to 8,744. The airline is now on target to hit sales of USD130 million in 2009, according to president and CEO Fathi Hilal Buhazza.”We have achieved exceptional growth during 2008 and the predicted upward trend is even steeper for 2009 as we continue to secure additional short and medium term aircraft wet lease contracts,” he said. The airline also announced new interactive features on its website to enable users to calculate cargo logistics, including maximum payload, flight distances, aircraft range, and currency conversions. The Maximus aircraft fleet includes eight An-124-100s, an Airbus A300-600RF, an IL-76TD and a Lockheed Hercules L382G which are in operation across the Middle East, Europe, Africa and Asia.last_img read more

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Cats top Cards 58-50 to remain perfect

first_imgIf a punch in the face is what the top-ranked University of Kentucky basketball team needed, as coach John Calipari said this week, fourth-ranked rival Louisville was happy to oblige on Saturday at the KFC Yum! Center.The two undefeated teams bloodied each other – quite literally, in UK point guard Tyler Ulis’ case – during a slugfest that featured few easy buckets and tension from tipoff to buzzer. But Kentucky took every shot and delivered blows back and finally pulled away late for a 58-50 victory.“That was a punch in the mouth,” Calipari said. “Everyone has made this like the end-all game and these young kids came in here and they performed. They weren’t rattled and they stayed focused.” In doing so, the Cats (13-0) might’ve cleared the tallest hurdle remaining in the regular season. They’ve now beaten five teams that were ranked in at least one of the major polls, including three in the current Top 10. Talk of a perfect season will get louder after UK won its road opener for the first time in five seasons. UNDER PRESSURE: Freshmen come through for Wildcats INSTANT ANALYSIS: Takeaways from courtside at the KFC Yum! Center WHAT WE LEARNED: Adam Himmelsbach breaks down UK’s win GAME REWIND: Tweets, videos, analysis as it happenedBut the Cardinals (11-1) made the visitors earn it. The Wildcats turned it over 10 times in the first half and shot just 37 percent before the break. Every bucket came at a price, which was pain.“I didn’t just get punched,” said freshman forward Karl-Anthony Towns, who had 10 points and nine rebounds. “I probably caught some hooks and some haymakers. Good thing I was watching ‘Tyson’ last night, so I learned how to handle it.“But we needed this. We needed this badly. We haven’t had a game like this in a while.”Not since UK’s exhibition loss to the Dominican Republic national team this summer, in Towns’ estimation. Louisville, down as many as a dozen in the final five minutes, managed a moral victory in becoming the first collegiate team to lose by single digits against these Cats. UK’s lead was only four at halftime, and even after the Cats quickly stretched that margin to eight after the break, Louisville surged. With Kentucky star Willie Cauley-Stein sidelined because of foul trouble, the Cards cut the deficit to two with 8:48 remaining. But that’s when the smallest player in a brutal game took over. Ulis, the 5-foot-9 freshman who took an elbow that opened a cut above his right eye and sent blood streaming down his face in the first half, calmly dissected U of L’s smothering defense.“They played rough,” Ulis said, but “we were ready.” Play VideoPlayMuteCurrent Time 0:00/Duration Time 0:00Loaded: 0%0:00Progress: 0%0:00 Progress: 0%Stream TypeLIVERemaining Time -0:00 Playback Rate1ChaptersChaptersdescriptions off, selectedDescriptionssubtitles off, selectedSubtitlescaptions settings, opens captions settings dialogcaptions off, selectedCaptionsAudio TrackFullscreenThis is a modal window. The Video Cloud video was not found. Error Code: VIDEO_CLOUD_ERR_VIDEO_NOT_FOUND Kentucky’s Tyler Ulis (left) drives against UofL’s Terry Rozier (right) on Saturday at the KFC YUM! Center. UofK won 58-50. (By David Lee Hartlage, Special to the C-J) Dec. 27, 2014. UP NEXT: OLE MISS AT NO. 1 KENTUCKY7 p.m., Jan. 6, Rupp ArenaTV: SEC Radio: WHAS-840 and WAKY-103.5 Session ID: 2020-09-17:128321a62ccf8e676e9c3e8 Player ID: videojs-brightcove-player-936063-3962601421001 OK Close Modal DialogCaption Settings DialogBeginning of dialog window. Escape will cancel and close the window.TextColorWhiteBlackRedGreenBlueYellowMagentaCyanTransparencyOpaqueSemi-TransparentBackgroundColorBlackWhiteRedGreenBlueYellowMagentaCyanTransparencyOpaqueSemi-TransparentTransparentWindowColorBlackWhiteRedGreenBlueYellowMagentaCyanTransparencyTransparentSemi-TransparentOpaqueFont Size50%75%100%125%150%175%200%300%400%Text Edge StyleNoneRaisedDepressedUniformDropshadowFont FamilyProportional Sans-SerifMonospace Sans-SerifProportional SerifMonospace SerifCasualScriptSmall CapsDefaultsDoneClose Modal DialogThis is a modal window. This modal can be closed by pressing the Escape key or activating the close button.He swished a 3-pointer and drained a pull-up jumper to key a 10-2 run that finally broke the game open. Ulis finished with a team-high 14 points and although he had just two assists, he made even fewer mistakes. While starting point guard Andrew Harrison had six turnovers, Ulis and fellow freshman guard Devin Booker had none in 54 combined minutes.Ulis scored a dozen of his points after halftime, looking like a bandaged boxer but dancing circles around the Cardinals. He required three stitches after the game.“You’ve got to leave it all on the floor. Tyler Ulis always does that,” Towns said. “He almost gave his eye today for the game. When you have a person like that, it motivates all of us to see that if he can take it, we can take it.” Louisville made one final run at UK and had a chance to slash the lead to five with 1:32 to go when Wayne Blackshear was fouled shooting a 3-pointer. But he made only one free throw and the Wildcats finished the job. They held the Cardinals to 15-of-58 shooting and trailed just once, 13-12, for a total of 94 seconds.New CardsHQ and CatsHQ fan apps launchedAfter the lowest-scoring Kentucky-Louisville game since 1922, and after seeing his Cards manage only one assist to go with nine turnovers, coach Rick Pitino called the Cats “one of the greatest defensive teams I’ve seen in my 40 years.” That begs the question: Can anyone else push this Kentucky team to the brink in the regular season? Only Southeastern Conference games remain, and the league doesn’t have another team in the Top 25. And on Saturday, the Wildcats won despite Cauley-Stein producing just five points and six rebounds. They beat a top-five team on the road even when starting guards Andrew and Aaron Harrison combined to make just 3 of 16 shots. “Oh, we’ll be challenged,” Calipari swore afterward, adding that he isn’t worried about his team thinking this was the final test. “There was some disappointment. Willie and Andrew were disappointed in how they played. Aaron wasn’t exactly happy about how he played either.”But Kentucky’s coach, now 7-1 against Pitino since coming to Lexington, admitted he wakes up every day “whistling and skipping” because he has a team talented enough to overwhelm, deep enough to exhaust and unselfish enough to share.Then Saturday proved these Cats are also tough enough to take a punch. Kyle Tucker can be reached at (502) 582-4361. Follow him on Twitter @KyleTucker_CJ. last_img read more

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Why Drogba will remain at Chealsea

first_imgDidier Drogba had been strongly tipped to quit Chelsea last season after featuring infrequently under Luiz Felipe Scolari.The Cote d’Ivoire international rediscovered his form under Guus Hiddink, but speculation concerning his exit intensified after he verbally abused referee Tom Henning Ovrebo following his side’s 1-1 draw with Barcelona in the Champions League.But he penned a three-year deal with Chelsea last week and he has now explained his reasons in an interview with Goal.com.“I tranquilly spoke with the club and the new coach [Carlo Ancelotti] and I believe my place is here,” he said.“Instead of trying an adventure in another club, I decided to stay at Chelsea. This decision was well thought over and I believe it is the best for all parties.”The former Marseille frontman revealed he received “other offers” through his agent from “foreign clubs”, insisting that Chelsea “were always my first option”. Regarding his new boss, Drogba qualified Ancelotti as “a great coach, with an important resume.“I spoke with him and he clearly said what he wanted from me. I think I can do it and I accept the challenge of fighting for all I achieved during years with Jose Mourinho on the bench of Chelsea.”Credit: Luís Mira, Goal.comlast_img read more

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