শুক্রবার, ১৫ ফেব্রুয়ারি, ২০১৩

USC battery wields silicon nanowires to hold triple the energy, charge in 10 minutes

USC battery wields silicon nanowires to hold triple the energy, charge in 10 minutes

There's no shortage of attempts to build a better battery, usually with a few caveats. USC may have ticked all the right checkboxes with its latest discovery, however. Its use of porous, flexible silicon nanowires for the anodes in a lithium-ion battery delivers the high capacity, fast recharging and low costs that come with silicon, but without the fragility of earlier attempts relying on simpler silicon plates. In practice, the battery could deliver the best of all worlds. Triple the capacity of today's batteries? Full recharges in 10 minutes? More than 2,000 charging cycles? Check. It all sounds a bit fantastical, but USC does see real-world use on the horizon. Researchers estimate that there should be products with silicon-equipped lithium-ion packs inside of two to three years, which isn't long to wait if the invention saves us from constantly hunting for the nearest wall outlet.

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Via: Gizmodo

Source: USC

Source: http://feeds.engadget.com/~r/weblogsinc/engadget/~3/x15MT4U63MQ/

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Immigration reform's tough call: illegal immigrants married to US citizens (Christian Science Monitor)

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Minnesota Upsets Wisconsin In Overtime, 58-53

MINNEAPOLIS -- Eight minutes and 48 seconds without scoring.

Eleven minutes and one second without making a basket.

When Wisconsin's third straight overtime game ended in defeat for the first time, the Badgers had an unsightly series of bad possessions to blame.

Andre Hollins hit the go-ahead 3-pointer midway through overtime to finish with 21 points and lead Minnesota to a 58-53 victory over No. 20 Wisconsin on Thursday night.

From Ben Brust's jumper with 6:11 left in regulation until Jared Berggren's putback with 10 seconds remaining in the extra period, the Badgers didn't hit a shot ? making only four free throws in that stretch.

"The intensity ratchets up," Berggren said. "They increased their pressure defensively. They got the crowd into it. We probably got a little bit tentative."

Hollins went 4 for 4 from the free throw line over the final 18 seconds of overtime to seal it for the Gophers (18-7, 6-6 Big Ten). Sam Dekker scored 14 points and Brust added 11 points for the Badgers. They were 7 for 28 from 3-point range, negating 18 offensive rebounds.

Ryan Evans missed all five free throws he took in that decisive scoreless drought, dropping his season free throw percentage to 40.3

"You knew it was going to get us one game. Hopefully not two. What can you say?" coach Bo Ryan said.

Hollins hit his big shot with 3:38 remaining to give the Gophers a 52-49 lead. Trevor Mbakwe, who grabbed two huge rebounds in the closing minutes, tacked on two free throws to stretch the lead to five with 1:32 left.

The game was tied at 43 with just inside 8 minutes left in regulation, but the Badgers couldn't make much work after that.

Senior Mike Bruesewitz, playing in his home state for the final time, had a hand in the collapse, too. He missed a long 3-pointer with the Badgers leading 49-47 but drew a charge against Austin Hollins with 22.6 seconds left on the other end to get the ball back.

On the inbounds play, however, he moved his feet and was called for a violation.

"I've been in that position a hundred times, if not more," Bruesewitz said. "They called it, and that was the game."

The Gophers regained possession when Joe Coleman made both free throws with 17.4 seconds to tie it, and Traevon Jackson's runner in the lane bricked off the back of the trim.

"That's a tough turnover," Ryan said. "But we still had some other chances."

The Badgers were brimming with momentum, after beating then-No. 3 Michigan last weekend when Brust made a half-court shot to tie the game at the end of regulation. That came on the heels of the double-overtime win over Iowa. And not that long ago, they went to Indiana and came away with a five-point victory.

Cracking The Associated Press Top 25 for the first time since mid-November, Wisconsin was in position to keep moving up in the conference stqandings and sweep rival Minnesota for the second straight season.

The Gophers weren't ahead until 13:48 remained in the game, when Andre Hollins made two free throws for a 35-33 lead. Two minutes later, Mbakwe spun out of the post and threw down a baseline dunk to make it 37-35, igniting the home crowd. For the first time in weeks, the Gophers appeared to be playing with confidence when they had the ball.

The Badgers only had themselves to blame for that, after failing to break the game open early.

The Gophers missed 12 of their first 14 shots, and the two makes were dunks. They went nearly 6 1/2 minutes without scoring until Austin Hollins found a crease and sank a pull-up jumper in the lane to cut the lead to 12-6. Mbakwe was all but taken out of the offense, hounded by Jared Berggren and the Badgers' lane-clogging defense. Mbakwe was called for traveling once and three seconds in the lane to end another possession.

The Gophers guarded well enough themselves to stay in the game, though. Without any room to cut or drive, the ability to hit those outside shots became even more paramount. Bruesewitz, Jackson and Brust each made 3-pointers before halftime, but the Badgers missed 10.

On the other end, Austin Hollins sank one for the Gophers, and Andre Hollins hit two, none more important than his stutter-step launch from the top of the key with 8 seconds left that brought Minnesota within 24-22.

About a minute before that, Austin Hollins soared into the lane to pull down a rebound of Joe Coleman's miss with one hand, then flip his put-back in off the glass to cut the lead to five.

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Source: http://www.huffingtonpost.com/2013/02/15/minnesota-upsets-wisconsin-overtime_n_2691639.html

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বৃহস্পতিবার, ২৪ জানুয়ারি, ২০১৩

Westerners warned to leave Benghazi

LONDON (AP) ? Britain, Germany and the Netherlands urged their citizens Thursday to immediately leave the eastern Libyan city of Benghazi in response to what was described as an imminent threat against Westerners.

The warnings come a day after U.S. Secretary of State Hillary Rodham Clinton testified to Congress about the deadly September attack on the U.S. consulate in Benghazi that killed four Americans, including the ambassador to Libya. They also come as French troops battle al-Qaida linked militants in Mali, and follow the deaths of dozens of foreigners at the hands of Islamist extremists in Algeria ? though it remained unclear if those two events were linked to the European nations' concerns about Libya.

The foreign ministries of the three countries issued statements variously describing the threat as specific and imminent but none gave details as to its exact nature. Germany and Britain urged their nationals still in Benghazi to leave "immediately" while Dutch Foreign Ministry spokesman Thijs van Son said that "staying in this area is not to be advised."

It was not immediately clear how many people could be affected; Britain's Foreign Office said likely "dozens" of its citizens were in the city, while Dutch Foreign Ministry spokesman Thijs van Son said there are four Dutch citizens registered as being in Benghazi and possibly two more. Several countries have for months advised against all travel to the city, especially after the U.S. consulate was attacked, and local residents said that many foreigners had already left in recent weeks.

Benghazi, a city of 1 million people, is a business hub where many major firms employ Westerners. It also was where the Libyan uprising against longtime dictator Moammar Gadhafi began in 2011. Gadhafi was eventually toppled and killed after NATO backed the rebel movement, and the Arab country has since struggled with security. Al-Qaida-linked militants operate in the country alongside other Islamist groups.

Adel Mansouri, principal of the International School of Benghazi, said British and foreign nationals were warned two days ago about a possible threat to Westerners.

He said the school's teachers were given the option of leaving but decided to stay. The school has some 540 students. Most are Libyan with some 40 percent who hold dual nationality. Less than 5 percent are British while 10 to 15 students have U.S.-Libyan nationality, Mansouri said. Classes were not due to resume until Sunday because of a holiday Thursday.

"We told the British ambassador we are staying, and we'll be in touch," said Mansouri, himself a Libyan-British dual national. "We don't see a threat on the ground."

Saleh Gawdat, a Benghazi lawmaker, said French doctors who were working in Benghazi hospitals have left the city and that the French cultural center has closed out of concerns about potential retaliation over the French-led military intervention in nearby Mali, which began two weeks ago.

Violence in Benghazi has targeted both foreigners as well as Libyan officials in recent months ? with assassinations, bombings and other attacks.

In addition to the Sept. 11 attack on the U.S. consulate, an Italian diplomat's car was fired on by militants in Benghazi. The consul, Guido De Sanctis, wasn't injured in the attack earlier this month, but the incident prompted Italy to order the temporary suspension of its consular activities in the city and send its foreign staff home.

Islamist extremists are often blamed for targeting security officials who worked under Gadhafi, as a kind of revenge for torturing or imprisoning them in the past. Many city residents also blame Gadhafi loyalists who they say are trying to undermine Libya's new leaders by sowing violence.

Ibrahim Sahd, a Benghazi-based lawmaker and politician, said that the new government is putting together a plan to beef up security in the city and this "might have worried the Westerners of a backlash."

Noman Benotman, a former Libyan jihadist with links to al-Qaida who is now an analyst at London's Quilliam Foundation, said other groups inspired by the terror network have been gaining a following since Gadhafi's fall. There have been nearly a dozen attacks against Western targets in Libya recently, he said.

"It's the same al-Qaida ideology that is driving these militants," Benotman said.

He added, however, that the militants were unlikely to target oil or gas installations in Libya because they need support from the population. "Targeting these installations would turn Libyan workers and tribes against them," he said.

Oil companies working in other parts of Libya said they were aware of government warnings to citizens but there were no immediate plans for evacuations.

------------------

Associated Press writers Mike Corder in The Hague, Netherlands, Juergen Baetz in Berlin, Maggie Michael in Cairo, Paisley Dodds and Gregory Katz in London and Nicole Winfield in Rome contributed to this report.

Source: http://news.yahoo.com/westerners-warned-leave-benghazi-161040000.html

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The Engadget Show 40: The Best of CES with Kaz Hirai, 50 Cent, Ken Block and Arianna Huffington

The craziest week of the tech year is at end, and we have to say, we thoroughly enjoyed ourselves. Sure, it wasn't quite as epic as it has been in years past, but CES is still the show that sets the stage for the rest of 2013. By that measure, we may well be seeing an interesting shift. With the loss of Microsoft, some smaller companies have been using the show to make names for themselves amongst the 4K TVs released by the bigwigs like Samsung, Sony and LG. The Pebble smart watch, the Oculus Rift and the Razer Edge all scored big. We take a look at the products and discuss how things like crowdfunding are affecting the world of hardware startups.

We've also got interviews galore -- we'll be talking with Sony CEO Kaz Hirai, SMS Audio CEO (and rapper, we're told) 50 Cent, rally car driver Ken Block, Huffington Post founder Arianna Huffington, Stern Pinball CEO Gary Stern, MakerBot CEO Bre Pettis and CEA president Gary Shapiro among many, many others (including a very special appearance from Gallagher -- this is Vegas, after all). Daniel, the winner of our Bring a Reader to CES contest will show you what it's like going to the show for the first time and our editors discuss how this year's event compares to years past. And, of course, we've also got lots of floor time with our favorite gadgets from the show.

Toss on a comfortable pair of walking shoes, because it's time to do CES all over again.

Hosts: Tim Stevens, Brian Heater
Guests: Kaz Hirai, 50 Cent, Ken Block, Arianna Huffington, Gary Stern, Gary Shapiro, Daniel Orren, and many, many others
Producer: Ben Harrison
Executive Producers: Brian Heater, Joshua Fruhlinger

Download the Show: The Engadget Show - 040 (HD) / The Engadget Show - 040 (iPod / iPhone / Zune formatted) / The Engadget Show - 040 (Small)

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Source: http://www.engadget.com/2013/01/24/engadget-show-40/

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High blood calcium levels may indicate ovarian cancer

Jan. 23, 2013 ? A new study from Wake Forest Baptist Medical Center is the first to report that high blood calcium levels might predict of ovarian cancer, the most fatal of the gynecologic cancers.

Lead author Gary G. Schwartz, Ph.D., a cancer epidemiologist at Wake Forest Baptist, and colleague, Halcyon G. Skinner, Ph.D., of the University of Wisconsin Carbone Cancer Center, examined associations between blood calcium and ovarian cancer in two national population-based groups. They found that women who were later diagnosed with ovarian cancer and women who later died of ovarian cancer had higher levels of calcium in blood than women who did not before their cancer diagnosis.

Schwartz, who is well-known for his epidemiologic research in prostate cancer, said the idea for this study came about because of published research from his group which showed that men whose calcium levels were higher than normal have an increased risk of fatal prostate cancer. That led him to wonder if a similar relationship were true of ovarian cancer.

"One approach to cancer biomarker discovery is to identify a factor that is differentially expressed in individuals with and without cancer and to examine that factor's ability to detect cancer in an independent sample of individuals," Schwartz said. "Everyone's got calcium and the body regulates it very tightly," Skinner added. "We know that some rare forms of ovarian cancer are associated with very high calcium, so it's worth considering whether more common ovarian cancers are associated with moderately high calcium."

The idea is plausible, Schwartz explained, because many ovarian cancers express increased levels of a protein, parathyroid hormone-related protein (PTRHrP), which is known to raise calcium levels in blood in many other cancers.

Ovarian cancer has a high fatality rate because it is hard to detect and by the time symptoms arise, the cancer is usually advanced. Schwartz said early diagnosis might be accomplished through the use of a calcium biomarker, but cautions that more research is needed to confirm these results. "We found the link between serum calcium and ovarian cancer; we confirmed it, and even though the study is small, we're reporting it because it's a very simple thing in theory to test."

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The above story is reprinted from materials provided by Wake Forest Baptist Medical Center.

Note: Materials may be edited for content and length. For further information, please contact the source cited above.


Journal Reference:

  1. Gary G. Schwartz, Halcyon G. Skinner. Prospective studies of total and ionized serum calcium in relation to incident and fatal ovarian cancer. Gynecologic Oncology, 2013; DOI: 10.1016/j.ygyno.2012.12.046

Note: If no author is given, the source is cited instead.

Disclaimer: This article is not intended to provide medical advice, diagnosis or treatment. Views expressed here do not necessarily reflect those of ScienceDaily or its staff.

Source: http://feeds.sciencedaily.com/~r/sciencedaily/top_news/~3/YIFWQsMILeM/130123115413.htm

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বুধবার, ২৩ জানুয়ারি, ২০১৩

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