Source: http://news.feedzilla.com/en_us/stories/politics/top-stories/166539286?client_source=feed&format=rss
opensky dia frampton dia frampton zook john elway john elway eric decker
Monday, November 28, 2011
Anne Hathaway Engaged To Adam Shulman (Photos)
Anne Hathaway Engaged To Adam Shulman (Photos)
Anne Hathaway is engaged! The actress is set to marry Adam Shulman, 30, whom she has dated since 2008. The “Devil Wears Prada” star was [...]
Anne Hathaway Engaged To Adam Shulman (Photos) Stupid Celebrities Gossip Stupid Celebrities Gossip News
Source: http://stupidcelebrities.net/2011/11/28/anne-hathaway-engaged-to-adam-shulman-photos/
texas longhorns texas longhorns oklahoma state football oklahoma state football case mccoy case mccoy kristin davis
No. 10 USC blasts UCLA 50-0 in season finale (AP)
LOS ANGELES ? UCLA showed up at the Coliseum in unfamiliar all-white uniforms, flouting tradition and radiating confidence for their annual showdown with Southern California.
A few hours later, the Bruins probably wished they had packed more disguises.
Matt Barkley passed for 423 yards and six touchdowns in his possible Coliseum farewell, Robert Woods set the conference's single-season receptions record while catching 12 passes for 113 yards and two TDs, and No. 10 USC finished its resurgent season with a 50-0 demolition of Pac-12 title game-bound UCLA on Saturday night.
Kevin Prince passed for 261 yards for the Bruins (6-6, 5-4 Pac-12), who had won three of four heading into the city championship game. The Bruins changed up their look for a game usually played in both clubs' colored home uniforms, but the Trojans left them with nothing but grass stains on the backs of those slick new jerseys, posting the third-biggest blowout in rivalry history and shutting out UCLA for just the second time in 64 years.
USC won seven of its final eight games capped by this utter obliteration of the Bruins, who will represent the division at Oregon next week despite finishing two games behind the Trojans in the South standings.
"Life still goes on. We still have the opportunity to do something big in the Pac-12 championship," said UCLA tailback Derrick Coleman, who was stopped on fourth-and-goal at the USC 1 in the first quarter. "That was a shot to the gut for everybody. We can't take anything for granted. We've got to go out and take it."
After the game, the Trojans wore T-shirts proclaiming themselves to be the South division champions. UCLA had no room to argue after the postseason-banned Trojans still went out in style, jumping to a 29-point halftime lead before posting their largest victory in the city championship game since 1930, the rivalry's second year.
"Tonight they were clearly the superior team," UCLA coach Rick Neuheisel said. "I don't think that's the case all the time. I believe we can close the gap, and we will. We weren't good enough to play a marquee team like USC."
Earlier this week, Neuheisel said he felt the Bruins had "closed the gap more" with the Trojans, who won 10 games for the eighth time in the past decade.
Mind the gap, UCLA.
"They took it very personally," USC coach Lane Kiffin said of his players. "That's a pretty strong statement to make. Did it motivate them? I don't know, but it was talked about a lot, and not much by me. I think they felt disrespected."
Despite the Bruins' Pac-12 title game berth, Neuheisel's job is thought to be in jeopardy after his fourth inconsistent season. Athletic director Dan Guerrero said Neuheisel will coach in Friday's title game, but the program will be evaluated after that.
Marqise Lee had 13 catches for 224 yards and two TDs during a showcase of offensive brilliance by the Trojans (10-2, 7-2).
"We've worked hard for this, and I think we deserve to celebrate this," said Barkley, who surpassed Matt Leinart's single-season conference record for touchdown passes. "We knew (about the postseason ban) coming into this year, and there's nothing we can do about it. We just tried to take advantage of every opportunity we did have."
With the Coliseum crowd repeatedly chanting "One more year!" Barkley was brilliant in what might have been the junior's final game at USC. He went 35 for 42 and set a Pac-12 record with his 39th touchdown pass early in the fourth quarter, hitting Woods from 41 yards out to surpass Leinart's mark. Barkley also surpassed his own school record set earlier this year with 35 completions.
Barkley and left tackle Matt Kalil are near-certain first-round NFL draft picks, but they claim they haven't decided whether to return for their senior seasons and a shot at a national title with a team that's likely to be among the nation's most talented next year despite severe NCAA scholarship restrictions that start in 2012. Barkley again declined to speculate on his decision, saying he'll figure it out soon.
"Unless he wants to do it, just to be a special Trojan, he ain't coming back," Kiffin said. "He's every bit ready to go to the NFL. It's just going to be a decision, does he want to do something really unique? He might be the guy to do that."
Woods broke Keyshawn Johnson's 1995 record with his 103rd catch during the first half, while Lee joined Woods as a 1,000-yard receiver. Rhett Ellison and Randall Telfer also caught TD passes from Barkley, who had 29 scoring passes and just four interceptions in his last eight games.
Curtis McNeal added a 73-yard TD run as USC beat UCLA for the 12th time in the last 13 meetings.
Kiffin had no mercy on his rival while claiming the Victory Bell. USC went for a 2-point conversion after its third touchdown, and Barkley attempted 50-yard passes in his first two plays after halftime, hitting Lee for a 52-yard score with the second throw to take a 36-0 lead. Kiffin and Neuheisel still shared a warm postgame handshake.
The Bruins failed to score on three drives inside the USC 25 in the first half, with Prince throwing an end-zone interception to T.J. McDonald. USC's defense preserved its first shutout since Nov. 1, 2008, by stopping the Bruins on fourth down at the 7 with 2:48 to play.
USC hadn't shut out UCLA since 2001, the only other time since 1947.
iraq war loma prieta loma prieta harold camping ucla football kim kardashian and kris humphries kim kardashian and kris humphries
Sunday, November 27, 2011
Morocco's Arab Spring election won by Islamists (San Jose Mercury News)
RSS Feed Search Engine - Real-Time Search Powered by FeedRank
Sorry, Readability was unable to parse this page for content.
Source: http://www.rssmicro.com/rss.web?q=NFL
take care childish gambino camp drake take care tracklist drake take care tracklist dr murray trial herman cain take care drake
Los Angeles Life Insurance Options | Simply Fashion
Friday, November 25th, 2011 at 5:39 pm ?
(Please visit our articles about furniture direct, writing desk, and glass desk)
Los Angeles life insurance policies are a must-have for everybody. Even though you can find a huge number of citizens inside the higher LA region that really don?t have coverage, there has never been a better time to buy coverage. You can store online to your insurance coverage requirements these days, which makes it less difficult so that you can get the protection which you should have. With four million citizens inside the town appropriate, L. a. is among the biggest cities within the U.S. As this kind of, lifestyle insurance for citizens is much more imperative because the setting is way much more substantial threat than a rural environment.
There are several issues that you simply require to look for once you are looking for Los Angeles life insurance. First, you ought to often be within the research for reputable organizations. It does not make a difference simply how much you pay for a coverage or even simply how much protection you receive should you don?t get it from a company that you simply can depend on. When you locate respected companies, you will then require to consider what each and every 1 gives and whether it suits your requirements.
This contains choosing the sort of life insurance coverage that you want. Term insurance policies are straightforward, and supply the easiest solution for easy lifestyle insurance defense. However, some individuals choose the perks and additional attributes of whole, universal, or variable daily life insurance policies.
You need to take a look at each kind of coverage and decide which 1 best suits your requirements. Consider the benefits and drawbacks of each type of insurance and what they are able to supply, and then select the one that suits what you are trying to find. Utilize for Los Angeles life insurance quotes using the organizations which you like, and get as several rates as you want. Many people tend to use for 1 quote at a time, but this could trigger trouble in the long term. One denial from the organization may cause you to battle to locate coverage from any other organizations, which is why simultaneous quotation programs are far more appropriate and beneficial.
Los Angeles life insurance prices will vary dependent on exactly where you reside inside the metropolis. People who live in places like Compton, Inglewood, East LA, and South Central will pay more for daily life insurance than individuals who live in nicer neighborhoods or locations with decrease crime rates. You need to contemplate all of such aspects, however, if you?re inclined to take the time it is straightforward to get the life insurance that you simply want.
Want to find out more about Los Angeles life insurance, then visit Dave Harris?s site on how to choose the best Los Angeles life insurance quotes for your needs.
(Please visit our articles about l desk, furniture house, and medical office furniture)Source: http://www.simplyfashion.tk/los-angeles-life-insurance-options/
last of the mohicans last of the mohicans ryan howard meteor shower 2011 meteor shower 2011 home depot center the replacements
Saturday, November 26, 2011
Route 66 Maps + Navigation now available for Android users, augmented realists
It's been a long and winding road, but Route 66 Maps + Navigation has finally arrived on the Android Market, no less than eight months after launching for iOS. Available on handsets and tablets running Android 2.0 or above, this app brings Route 66's "Follow Me" augmented reality navigation to your windshield, superimposing upon your surroundings an animated lead car to act as your guide. It's available on a free, 30-day trial at the source link below -- after that, you'll have to shell out $65 for a lifetime worldwide license, or $40 for a US license. Steer past the break for more information, in the full press release.
Continue reading Route 66 Maps + Navigation now available for Android users, augmented realists
Route 66 Maps + Navigation now available for Android users, augmented realists originally appeared on Engadget on Fri, 25 Nov 2011 15:35:00 EDT. Please see our terms for use of feeds.
Permalink
Pocket GPS World | 
Android Market | Email this | CommentsSource: http://www.engadget.com/2011/11/25/route-66-maps-navigation-now-available-for-android-users-augm/
gifts for mom gifts for mom jason witten patti stanger pepper spray kurt busch kurt busch
App Giveaway: Video Star for iPhone
Video Star is an iPhone and iPad app that lets you record music videos to your favorite songs features – you! You can mix layouts, colors, action, and frames easily and even pause recording to make scene changes a breeze. Once your masterpiece is created, it can be shared...
 |  |
Source: http://feedproxy.google.com/~r/TheIphoneBlog/~3/OOcBi4-Hld0/story01.htm
yolo steelers vs ravens keystone xl pipeline jack dempsey lake malawi hines ward warren jeffs
Older athletes get caught cheating, too (AP)
COLORADO SPRINGS, Colo. ? The anti-doping police are sending out a new message to the AARP crowd: We're keeping an eye on you, too.
Looking more skeptically at events outside of elite and Olympic circles, the U.S. Anti-Doping Agency has suspended nine masters athletes for positive tests so far in 2011. That accounts for more than one-third of the 25 sanctions the agency has announced this year. Among the masters to test positive was one competitor in his 50s and three in their 60s.
The agency wants to cut down on what it says is an increasing number of older-age cheaters, an effort critics decry as petty and a waste of money for a cause that is already operating on limited resources. But cheating needs to be stopped throughout sports, the head of USADA says.
"We get calls from athletes about doping that's happening in their sports at all levels," USADA CEO Travis Tygart said. "We've also had event organizers call us and express their concerns and their desire to put in a good anti-doping program."
USA Track and Field, for instance, requested a USADA presence at its masters national championships this summer after international organizers told the American track organization it would stop accepting U.S. records if it didn't ramp up its anti-doping program.
Testing at nationals resulted in three suspensions, all from people who either disputed their test or said they got tripped up by a tainted supplement.
Craig Shumaker, 63, admitted to taking a doctor-prescribed testosterone gel that he knew would trigger a positive test if he was selected. He was, and received a two-year suspension, which carries the customary contingency that he must submit to more tests when he's reinstated. His win at nationals in shot put and second-place finish in discus have been erased, though Shumaker insists the drug gave him no benefit.
He said he has no intention of going off the drug, commonly prescribed for people diagnosed with low testosterone, and said the positive test pretty much marks the end of his days as a competitive thrower.
"There's a little bit of sour grapes for me," Shumaker said. "My body type hasn't changed. I weigh the same as I have for 15 years. You hear the rumors, `He was taking this, taking that.' But most of us, we're just here for the camaraderie. I think it's a bigger issue that masters track needs to fess up to. People want to maintain a healthy lifestyle and there are medicines that can help you, so why should that ban you from competing?"
As is the case with elite athletes, masters can apply for a Therapeutic Use Exemption for drugs that are legitimately prescribed by a doctor. However, Shumaker and others who tested positive decried a process filled with too much red tape that they say often results in rejection ? not worth it to the athletes who claim to be competing more for fun than winning.
"At our age, it's not so much about, can I get some cheap 50-cent gold medal without my name on the back" Shumaker said. "You go there to be with friends. You cheer for the guy who gets 10th as much as the guy who gets first."
Gary Snyder, the chair of the masters track and field competitions at USATF, said his staff "did a fair amount of soul searching before implementing this nationally."
They decided to go ahead with it because they felt it was good for the sport.
"There was a substantial amount of education put forward," Snyder said, noting there were eight seminars offered before the program went in place. "People had ample opportunity to listen in, ask questions, find out if they were possibly taking medication they shouldn't have. My opinion is these three folks apparently didn't attend them, or didn't spend the time and energy to go online" to learn about the banned-substance list.
Cyclists accounted for the other positive tests, in part because USA Cycling chose to increase its testing numbers in non-elite events, asking USADA to go to national championships, a number of state championships and a few odd regional and local races, "based on tips we got," said USA Cycling CEO Steve Johnson.
"I'm ecstatic about it, frankly," Johnson said. "It's not as though doping just became an issue in masters cycling. It's been going on at this level for some time. If you don't look, you'll never find a problem."
As was the case with the track athletes, the cyclists' stories varied widely. Two suspensions were handed to people implicated in an ongoing case involving Joe Papp, a cyclist who pleaded guilty to selling HGH and EPO over the Internet, but whose testimony has helped USADA nab several cyclists for doping.
A more recent suspension was handed to a 62-year-old cyclist who refused to submit to an out-of-competition test and had been heard bragging to friends about his ability to race while doping.
One of the track athletes who got caught, Fred Kieser, told The Associated Press he made a genuine mistake and deserved what he got; he bought a tainted supplement from a nutrition store that he insisted provided no help. He received a reduced, eight-month ban and said he believed testing at masters events was a good idea.
Tygart said runners who admit their mistakes and move on are the rarity. He said it's no surprise that people who get caught cheating have some issues with the system.
"You have to take what they say with a grain of salt," Tygart said. "Certainly, it's not a waste of time to protect the integrity of competition and protect clean athletes."
After receiving her second suspension, shot putter Kathy Jager, 68, said in an email to the website masterstrack.com: "I have never nor will I take medication for the purpose of performance enhancing. I train hard, but take pride in my honestly earned accomplishments."
Jager said she has lipodystrophy, a medical condition she says accounts for her muscular body style.
One of USADA's core missions is to convince athletes at the grass-roots level that, besides being against the rules, taking performance-enhancing drugs is dangerous. It has fewer chances to actually enforce those rules at that level; high schools and colleges aren't governed by the USADA rules and there isn't enough money to police every local event sanctioned by, say, USA Track and Field or USA Cycling.
Tygart conceded that spending money on masters events does put a strain on budgets, but he believes it's a worthwhile effort. He says the positive results at masters events "feeds into our belief that, unchecked, in a win-at-all-costs culture, some athletes and parents will do whatever it takes to win."
"Whether it's scholarships or bragging rights, there has to be a check against that," he said. "Some chance that someone might get caught if they're trying to beat the system at that level."
official time news 9 tuscaloosa tuscaloosa earthquake california earthquake california crimson tide
China, Pakistan boost anti-terror cooperation (AP)
JHELUM, Pakistan ? The Pakistani and Chinese attack choppers swoop low across the valley, strafing a mock terrorist hideout and a bomb-making factory. Then a joint commando team storms the camp ? to the gentle applause of top brass from both nations watching from the stands.
The fact that such a drill is needed reflects a new concern troubling their long-standing alliance: Chinese militants along the Afghan border allegedly aiding separatism in China and plotting terrorist attacks there
Countries around the world, especially the U.S., share Chinese concerns about Pakistan's militant-infested tribal regions, but few get the same kind of public commitment of help as Beijing. It's a legacy of China's oft-hailed "all-weather friendship" with Pakistan.
Anti-terror cooperation is the latest example of the special relationship between the neighboring countries.
China's good will is vital to Pakistan: China is its largest defense supplier, and it has helped construct two nuclear reactors. Chinese investments help keep the Pakistani economy afloat.
Chinese economic interests are also threatened because militants have made parts of the country no-go areas. Chinese companies are investing in oil, gas and coal extraction to fuel their country's rapidly expanding economy. There are hundreds of Chinese citizens working in Pakistan, and some have occasionally been attacked or kidnapped.
Its main interest in Pakistan is countering rising Indian power in the region, a goal that is shared by Islamabad, which views India as an enemy.
As ties with Washington have deteriorated this year, some Pakistani leaders have suggested China could fill the economic, diplomatic and military void if America scales back its commitment.
Part of the concern centers on the bitter aftermath of the May 2 U.S. raid that killed al-Qaida founder Osama bin Laden in Pakistan, including reports that Pakistan gave China access to the damaged high-tech stealth helicopter left behind by U.S. commandos when they killed bin Laden. China denied that.
Despite the tensions following the raid, some American counter-terror cooperation with Pakistan has continued. The Pakistani army still allows Washington to fire missiles at militants in its northwest regions. That also cuts into the ability of Chinese militants to train and forge links with other extremists there.
Thursday's dramatic war games in the dusty, hilly Punjab countryside were the kind of Pakistani public display of international anti-terror cooperation that Washington could only dream of, given the environment of mistrust and suspicion with Pakistan.
"Terrorism is something which is a threat to China, in some ways, and to other countries in the world as well," Pakistani Gen. Ashfaq Pervez Kayani told journalists alongside China's deputy chief of general staff, Gen. Hou Shusen. "There is a need to share our experiences with our Chinese friends," the Pakistani army chief said.
Militants from China, mostly Uighur-speaking Muslims from the Xinjiang region, are present in Taliban-controlled parts of northwest Pakistan, where they live and train alongside terrorists from around the world. Visitors to North Waziristan, a militant stronghold, say they are known locally as "Chinese Taliban." A few times a year, they release videos threatening Beijing and demanding freedom for Xinjiang.
Beijing blamed a spate of unrest in July this year in Xinjiang on one group, the East Turkestan Islamic Movement, said to be based in Pakistan. In an unusually blunt charge, China alleged the terrorists were trained in Pakistan. The Pakistani government and army quickly publicly pledged more help.
Many China watchers and Uighur activists call the Chinese accusations a smoke screen to obscure the anger and hopelessness among Uighurs they say are driving the violence. By blaming outside forces, they say China hopes to avoid shortcomings in policies aimed at reducing tensions there.
Kayani acknowledged ETIM's presence in Pakistan. The military rarely refers to Chinese militants when discussing the concerns of Afghanistan and the United States about militants using North Waziristan as a base for attacks across the border.
"We have done our utmost to eliminate this threat of ETIM and other extremists for China," said Kayani. "We have had a very close cooperation and we do exchange intelligence."
Pakistan has handed over Uighur suspects to China, but actual joint anti-terror operations, as opposed to simulated ones targeting terrorists on Pakistani soil are not expected to happen.
China does not have a military presence in Pakistan and is not known to be pursuing one. That contrasts, with the U.S. Army, which had more than 100 trainers embedded with Pakistani troops fighting militants in the northwest. They were ordered out in the aftermath of the bin Laden raid, which enraged the Pakistani army because it was carried out without its knowledge.
Pakistan's military is not known to have directly targeted Chinese militants in the border regions. Indeed, it has long rebuffed American requests for action in North Waziristan, saying it doesn't have enough troops to do so effectively.
Tensions between China and Pakistan, two nuclear-armed countries, rarely make their way into the public domain, and there were none on display during the anti-terror drill.
The mock operation involved around 500 soldiers from both nations. It began with a spectacular parachute drop of Chinese troops from 3,000 feet (1,000 meters).
Helicopters dropped other soldiers close to the buildings. They raided the structures and then detonated them, sending balls of orange flames and mushroom clouds of smoke into the early winter air, before flying off.
After the drill was over, the generals enjoyed a Pak-China feast of goat curry, nan bread, sweet and sour soup and Chinese-style chicken. Presents were exchanged. In a final symbol of their alliance, both sets of troops lined up, chanting in unison, "Pakistan and China friendship is everlasting," pumping their fists.
cmas world series of poker joe walsh zsa zsa gabor heavy d dead heavy d dead alaska weather
Friday, November 25, 2011
Microsoft Promises No-Hassle Windows 8 Upgrades (NewsFactor)
Microsoft is working to streamline the installation process for Windows 8 once its newest operating-system version becomes available to consumers next year. The software giant's Windows setup and deployment team aims to "reduce the time from start to finish," said Steven Sinofsky, the president of Microsoft's Windows business division.
Some PC users will avoid the problem altogether by buying a new PC that ships with Windows 8 pre-installed. According to Microsoft, however, more than 450 million PCs are running Windows 7 that also will be able to run Windows 8, and many systems running Windows Vista and even Windows XP also will be eligible for an upgrade.
"Support for these PCs running different Windows versions is a big challenge in terms of testing all possible upgrade paths, languages, service packs, architectures, and editions," noted Christa St. Pierre, a member of the Windows setup and deployment team.
Pushing Upgrades
Microsoft intends to reduce the number of hoops that users must jump through in order to get Windows 8 up and running on their machines. After all, the goal at Microsoft is the same as always: to compel as many PC users as possible to buy the company latest OS upgrade.
The problem is that many PC customers have come to regard an operating-system upgrade as a formidable challenge, either based on their own prior upgrade experiences or those of friends and family members.
In 2010 Microsoft commissioned a study of how people make PC purchase decisions, and also talked to customers to find out more. "Even though many customers wanted to upgrade" to Windows 7, St. Pierre noted, the current setup experience "just wasn't easy enough to make them feel confident in doing so."
With Windows 8, Microsoft intends to offer two upgrade paths: one for people looking to minimize the hassle and a second for those customers who want more control. For the first customer group, Microsoft will provide a streamlined setup that customers can implement by running an .exe file from a DVD or via Web delivery.
"The first group typically runs setup in the user interface (UI) of their current Windows OS -- in other words, they launch it like an app," St. Pierre wrote.
For the second group, which typically runs setup from boot media, the software giant will deliver an advanced setup that runs when the user boots off a DVD or USB key. "Advanced setup is the home of all things familiar to the advanced user, including full support for unattended installation, partition selection, and formatting," St. Pierre said.
Online Install Improvements
Once Windows 8 launches next year, Microsoft intends to heavily promote Web-based installations, though boxed sets also will remain available for purchase in brick-and-mortar stores or from online retailers.
"With our Web setup experience, we actually 'pre-key' the setup image that is downloaded to a unique user, which means that you don't have to type in the 25-digit product key when you install," St. Pierre said.
The online installation process for Windows 7 customers was so complicated that it required users to click their way through 60 different screens to complete. With Windows 8, however, the separate compatibility adviser, download manager and install segments for Windows 7 have been condensed into a single, streamlined experience.
"We first determine if your PC, apps, and devices will work in the new OS, note which things you want to keep -- apps, files and/or settings -- and then install the new OS," St. Pierre wrote. What's more, "you can choose to keep all, some, or none of your personal data depending on the OS you're upgrading from, and your personal preferences."
Source: http://us.rd.yahoo.com/dailynews/rss/software/*http%3A//news.yahoo.com/s/nf/20111125/tc_nf/81120
kris jenner kris jenner livestand power ball kelly slater kelly slater palindrome
Physicists set strongest limit on mass of dark matter
![[ Back to EurekAlert! ]](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_vs0GpBC4AhBpDFN2OQq9EcG4gSVEUCecxEd6dOR6H7zshzq7ayLYoXiL14oLfyt6J7X-jLboiioYlwsArqhZL879RaU111M1SB7vf70cc=s0-d){kind=small}
Public release date: 23-Nov-2011[ | E-mail |
Share ] Contact: Richard Lewis
Richard_Lewis@brown.edu
401-863-3766
Brown University
PROVIDENCE, R.I. -- If dark matter exists in the universe, scientists now have set the strongest limit to date on its mass.
In a paper to be published on Dec. 1 in Physical Review Letters (available in pdf), Brown University assistant professor Savvas Koushiappas and graduate student Alex Geringer-Sameth report that dark matter must have a mass greater than 40 giga-electron volts in dark-matter collisions involving heavy quarks. (The masses of elementary particles are regularly expressed in terms of electron volts.) Using publicly available data collected from an instrument on NASA's Fermi Gamma-ray Space Telescope and a novel statistical approach, the Brown pair constrained the mass of dark matter particles by calculating the rate at which the particles are thought to cancel each other out in galaxies that orbit the Milky Way galaxy.
"What we find is if a particle's mass is less than 40 GeV, then it cannot be the dark matter particle," Koushiappas said.
The observational measurements are important because they cast doubt on recent results from dark matter collaborations that have reported detecting the elusive particle in underground experiments. Those collaborations DAMA/LIBRA, CoGeNT and CRESST say they found dark matter with masses ranging from 7 to 12 GeV, less than the limit determined by the Brown physicists.
"If for the sake of argument a dark matter particle's mass is less than 40 GeV, it means the amount of dark matter in the universe today would be so much that the universe would not be expanding at the accelerated rate we observe," Koushiappas said, referring to the 2011 Nobel prize in physics that was awarded for the discovery that the expansion of the universe is accelerating.
Independently, the Fermi-LAT collaboration arrived at similar results, using a different methodology. The Brown and Fermi-LAT collaboration papers will be published in the same issue of Physical Review Letters.
Physicists believe everything that can be seen planets, stars, galaxies and all else makes up only 4 percent of the universe. Observations indicate that dark matter accounts for about 23 percent of the universe, while the remaining part is made up of dark energy, the force believed to cause the universe's accelerated expansion. The problem is dark matter and dark energy do not emit electromagnetic radiation like stars and planets; they can be "seen" only through their gravitational effects. Its shadowy profile and its heavy mass are the main reasons why dark matter is suspected to be a weakly interacting massive particle (WIMP), which makes it very difficult to study.
What physicists do know is that when a WIMP and its anti-particle collide in a process known as annihilation, the debris spewed forth is comprised of heavy quarks and leptons. Physicists also know that when a quark and its anti-quark sibling annihilate, they produce a jet of particles that includes photons, or light.
Koushiappas and Geringer-Sameth in essence reversed the annihilation chain reaction. They set their sights on seven dwarf galaxies which observations show are full of dark matter because their stars' motion cannot be fully explained by their mass alone. These dwarf galaxies also are largely bereft of hydrogen gas and other common matter, meaning they offer a blank canvas to better observe dark matter and its effects. "There's a high signal-to-noise ratio. They're clean systems," Koushiappas said.
The pair analyzed gamma ray data collected over the last three years by the Fermi telescope to measure the number of photons in the dwarf galaxies. From the number of photons, the Brown researchers were able to determine the rate of quark production, which, in turn, allowed them to establish constraints on the mass of dark matter particles and the rate at which they annihilate.
"This is the first time that we can exclude generic WIMP particles that could account for the abundance of dark matter in the universe," Koushiappas said.
Geringer-Sameth developed the statistical framework to analyze the data and then applied it to observations of the dwarf galaxies. "This is a very exciting time in the dark matter search, because many experimental tools are finally catching up to long-standing theories about what dark matter actually is," said Geringer-Sameth, from Croton-on-Hudson, N.Y. "We are starting to really put these theories to the test."
###
The National Science Foundation funded the research.
[ | E-mail | Share ] ?
AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
Public release date: 23-Nov-2011[ | E-mail |
Share ] Contact: Richard Lewis
Richard_Lewis@brown.edu
401-863-3766
Brown University
PROVIDENCE, R.I. -- If dark matter exists in the universe, scientists now have set the strongest limit to date on its mass.
In a paper to be published on Dec. 1 in Physical Review Letters (available in pdf), Brown University assistant professor Savvas Koushiappas and graduate student Alex Geringer-Sameth report that dark matter must have a mass greater than 40 giga-electron volts in dark-matter collisions involving heavy quarks. (The masses of elementary particles are regularly expressed in terms of electron volts.) Using publicly available data collected from an instrument on NASA's Fermi Gamma-ray Space Telescope and a novel statistical approach, the Brown pair constrained the mass of dark matter particles by calculating the rate at which the particles are thought to cancel each other out in galaxies that orbit the Milky Way galaxy.
"What we find is if a particle's mass is less than 40 GeV, then it cannot be the dark matter particle," Koushiappas said.
The observational measurements are important because they cast doubt on recent results from dark matter collaborations that have reported detecting the elusive particle in underground experiments. Those collaborations DAMA/LIBRA, CoGeNT and CRESST say they found dark matter with masses ranging from 7 to 12 GeV, less than the limit determined by the Brown physicists.
"If for the sake of argument a dark matter particle's mass is less than 40 GeV, it means the amount of dark matter in the universe today would be so much that the universe would not be expanding at the accelerated rate we observe," Koushiappas said, referring to the 2011 Nobel prize in physics that was awarded for the discovery that the expansion of the universe is accelerating.
Independently, the Fermi-LAT collaboration arrived at similar results, using a different methodology. The Brown and Fermi-LAT collaboration papers will be published in the same issue of Physical Review Letters.
Physicists believe everything that can be seen planets, stars, galaxies and all else makes up only 4 percent of the universe. Observations indicate that dark matter accounts for about 23 percent of the universe, while the remaining part is made up of dark energy, the force believed to cause the universe's accelerated expansion. The problem is dark matter and dark energy do not emit electromagnetic radiation like stars and planets; they can be "seen" only through their gravitational effects. Its shadowy profile and its heavy mass are the main reasons why dark matter is suspected to be a weakly interacting massive particle (WIMP), which makes it very difficult to study.
What physicists do know is that when a WIMP and its anti-particle collide in a process known as annihilation, the debris spewed forth is comprised of heavy quarks and leptons. Physicists also know that when a quark and its anti-quark sibling annihilate, they produce a jet of particles that includes photons, or light.
Koushiappas and Geringer-Sameth in essence reversed the annihilation chain reaction. They set their sights on seven dwarf galaxies which observations show are full of dark matter because their stars' motion cannot be fully explained by their mass alone. These dwarf galaxies also are largely bereft of hydrogen gas and other common matter, meaning they offer a blank canvas to better observe dark matter and its effects. "There's a high signal-to-noise ratio. They're clean systems," Koushiappas said.
The pair analyzed gamma ray data collected over the last three years by the Fermi telescope to measure the number of photons in the dwarf galaxies. From the number of photons, the Brown researchers were able to determine the rate of quark production, which, in turn, allowed them to establish constraints on the mass of dark matter particles and the rate at which they annihilate.
"This is the first time that we can exclude generic WIMP particles that could account for the abundance of dark matter in the universe," Koushiappas said.
Geringer-Sameth developed the statistical framework to analyze the data and then applied it to observations of the dwarf galaxies. "This is a very exciting time in the dark matter search, because many experimental tools are finally catching up to long-standing theories about what dark matter actually is," said Geringer-Sameth, from Croton-on-Hudson, N.Y. "We are starting to really put these theories to the test."
###
The National Science Foundation funded the research.
[ | E-mail | Share ] ?
AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
Source: http://www.eurekalert.org/pub_releases/2011-11/bu-pss112311.php
dallas cowboys ct news hemlock hemlock mark rothko mark rothko wiccan
VTech V.Reader Interactive E-Reading System
Reading comes to life with the VTech V. Reader Interactive E-Reading System ($59.99 list). This storyteller learning system brings books to life and makes reading vivid and fun for your child! Kids can touch and play as they learn core reading skills, touch the screen to read the story, and play interactive reading games.
With the V.Reader Interactive E-Reading System, children will discover the joy of reading while interacting with well-loved characters like Elmo and Disney Princesses. As the stories come alive with animations and sounds on the color touch screen, children take a journey into a world of imagination while developing the necessary building blocks to grow from a pre-reader to a confident and fluent reader. The V.Reader comes pre-loaded with the "What's That Noise" storybook and fun applications such as a Photo Viewer, Video Player, and art activities. Additional storybook cartridges (sold separately) offer new stories and adventures and feature a fully narrated and animated story, reading skill games, and a Story Dictionary. You can even download additional e-books, avatars, and themes while tracking your child's progress on VTech's Learning Lodge Navigator.
Source: http://feedproxy.google.com/~r/ziffdavis/pcmag/~3/r3acW148SbA/0,2817,2396650,00.asp
last minute halloween costumes rum diary klipsch image s4 chris bosh world series october 28 2011 october 28 2011
Thursday, November 24, 2011
Video: Tough Stretch for Stocks
Are market fears overblown, and will the Fed's new stress test relieve bank fears? Dick Bove, Rochdale Securities, and John Ryding, RDQ Economics, weigh in on bank stocks and the economic outlook for the next quarter.
Related Links:
Business & financial news headlines from msnbc.com
Source: http://video.msnbc.msn.com/cnbc/45409948/
greys anatomy x factor auditions 2011 x factor auditions 2011 redacted redacted banned books 30 rock
Drake "takes care" of No. 1 on album chart (Reuters)
LOS ANGELES (Reuters) ? Canadian singer Drake jumped straight to No. 1 on Wednesday on the Billboard Top 200 album chart with his latest offering "Take Care," while Rihanna dominated the singles chart with three songs in the top 10.
"Take Care" is the second No. 1 album for 25-year-old Drake, who debuted at No.1 with his first studio album, "Thank Me Later" in 2010 after signing a recording contract with Lil Wayne's Young Money Entertainment.
His new album sold 631,000 copies in its first week, according to Nielsen SoundScan, for a strong debut topped only by two other No. 1 albums so far this year: Lady Gaga's "Born This Way," which sold 1.1 million copies in its first week, and Lil Wayne's "Tha Carter IV," which sold 964,000 on its debut.
Critics have received "Take Care" warmly, with Jon Garcia at AllHipHop.com rating it an eight out of 10, and calling it "intriguing, filled with top-tier production and emotional lyrics."
Rolling Stone Magazine's Jon Dolan gave the album 4 out of 5 stars and said 'It's what Drake does best, collapsing many moods -- arrogance, sadness, tenderness and self-pity -- into one vast, squish-souled emotion."
The holiday season has spurred sales of festive albums as Michael Buble's "Christmas," which held steady at No. 2. Justin Bieber's "Under The Mistletoe" climbed to No. 5 and "Glee, The Music: The Christmas Album, Volume 2" debuted at No. 6.
British singer Adele's "21" climbed back up the album chart to No. 3 while Andrea Bocelli's "Concerto: One Night in Central Park" album debuted at No. 4. The "Now 40" music compilation fell to No. 7 and "The Twilight Saga: Breaking Dawn - Part 1" soundtrack fell to No. 8, despite the movie's $283.5 million opening weekend sales at the worldwide box office.
The top 10 albums were rounded out by Coldplay's "Mylo Xyloto" at No. 9 and Susan Boyle's "Someone To Watch Over Me" at No. 10. Last week's No. 1, rapper Mac Miller with "Blue Slide Park," fell to No. 24, making it the fourth largest drop from the top position in Billboard chart history.
Rihanna took over the Billboard Hot 100 singles chart this week, holding steady at No. 1 with "We Found Love" featuring Calvin Harris. She also claimed the No. 4 spot with her Drake collaboration on "Take Care" and debuted "You Da One," the second single from her new album "Talk That Talk" at No. 9.
The 23-year-old Barbadian singer will be competing for the No. 1 spot on the album charts next week with new releases by Nickelback, Daughtry, and Mary J. Blige.
Rihanna's "Talk That Talk" is currently holding the top position on the iTunes album chart, followed by Nickelback's "Here And Now," Drake's "Take Care" and Blige's "My Life II...The Journey Continues (Act 1)."
(Reporting by Piya Sinha-Roy; Editing by Bob Tourtellotte)
baby lisa irwin baby lisa irwin pearl jam 20 martha marcy may marlene lacuna lacuna paranormal activity 3 trailer
Gingrich risk: Will the GOP cast its lot with him? (AP)
WASHINGTON ? Being a conventional Republican has never been Newt Gingrich's style, and he clearly doesn't see it as the way to beat Mitt Romney in the presidential nominating contest.
Gingrich, the former House speaker, is sticking to his call for lenience for some illegal immigrants, a stand that critics call amnesty and that veers from GOP orthodoxy. A day after he emphasized his point in a debate, his position drew both praise and condemnation Wednesday.
But there's broader debate within Republican circles, six weeks ahead of the Iowa caucuses: Do party loyalists think their best challenger to President Barack Obama is a 68-year-old veteran of Washington's inside games, who left Congress with dismal approval ratings and who recently held a million-dollar consulting contract with mortgage backer Freddie Mac?
Gingrich is the latest Republican to emerge as a serious rival to Romney, the former Massachusetts governor who is more popular with the party establishment than with conservative activists. Campaign veterans still tend to see Romney as the likeliest nominee. But Gingrich's long, roller-coaster career makes it hard to rule him in or out with confidence.
Gingrich seems to have become "the center of gravity in this very unusual Republican nomination contest," said Dante Scala, a pollster and University of New Hampshire political scientist. He said the former Georgia congressman might be able to unite very conservative voters "who want a fundamental change in the scale and scope of government" and "somewhat conservative Republicans, who just want to defeat Obama."
"Illegal immigration is Newt's acid test," Scala said, and tea party conservatives might be "having second thoughts today. Let's see if he can keep them on board."
Attention focused Wednesday on Gingrich's renewed call for pathways to legal status for illegal immigrants who have lived long, peaceful and tax-paying lives in the United States.
"I don't see how the party that says it's the party of the family is going to adopt an immigration policy which destroys families which have been here a quarter-century," Gingrich said in the Republican debate Tuesday night. "I'm prepared to take the heat for saying let's be humane in enforcing the law."
Heat came quickly. "Newt Gingrich is finished!" said William Gheen, president of the anti-immigration group ALIPAC.
Rep. Steve King, R-Iowa, one of Congress' most outspoken conservatives, said Gingrich's prescription "is a form of amnesty" that "makes it harder" to consider endorsing him.
King told reporters America will suffer "if we let the rule of law be eroded and we allow people to be rewarded for breaking the law" by entering the country illegally.
Gingrich allies noted that he doesn't advocate citizenship, even for law-abiding, long-term illegal immigrants. They say his plan is a humane and realistic acknowledgment that the government is not going to round up and deport 11 million people who are here illegally. The smartest use of resources, they say, is to focus on illegal immigrants with few ties to their communities and problematic records with paying taxes and staying out of trouble.
Romney offered Gingrich no wiggle room. While campaigning in Iowa, he said, "People who have come to the country illegally should not have a special pathway that is preferable to those that stand in line in their home countries to come to this country."
Romney said Gingrich's plan would not stand scrutiny. "How about someone who's been here 20 years, how about 12 years, about 10, five, three?" he said. "How many children do you have to have to apply to this principle?"
"We make a mistake as a Republican Party in trying to describe which people who've come here illegally should be given amnesty," Romney said.
Democrats denounced Romney's position Wednesday. And some defended Gingrich, which may be of little help in Republican primaries.
"The truth is, he's correct," Rep. Charles Gonzales, the Texas Democrat who chairs the Congressional Hispanic Caucus, told reporters. "I'm hoping former Speaker Gingrich doesn't start walking back from it."
Steve Duprey, a Republican National Committee member from New Hampshire, who is uncommitted in the presidential race, said he applauds Gingrich for tackling the touchy immigration issue. "But he's going to have a problem with the conservatives," Duprey said
Some conservative journals are taking a wait-and-see approach to Gingrich's prospects.
"If 2012 were an ordinary election year, Gingrich would be doomed by his gaffes, three marriages and fleeting alliances with Hillary Clinton on health care and Nancy Pelosi on global warming," columnist Fred Barnes wrote in the Weekly Standard. But Republicans are obsessed with ousting President Barack Obama, he said.
"And if that means choosing a candidate with a lurid past and a penchant for self-destruction," Barnes said, then Republicans "are likely to swallow hard and nominate Gingrich."
Romney will keep arguing that he is best-suited instead.
___
Associated Press writers Thomas Beaumont in Iowa and Philip Elliott in Washington contributed to this report.
ed lee garmin nuvi 1450 amzn tommy john surgery colorado weather alcohol poisoning alcohol poisoning
Video: Canned soup boosts BPA levels
Researchers at the Harvard School of Public Health found that eating canned soup boosts urine concentration of the chemical bisphenol A (BPA) in humans. BPA is raising concerns among some health experts for its potential health effects in children, infants and fetuses. NBC?s Robert Bazell has more.
Source: http://video.msnbc.msn.com/nightly-news/45409281/
dwts cnn debate wild horses lyrics kennedy assassination kennedy assassination jfk assassination pie crust recipe
Wednesday, November 23, 2011
Tom Turkey s Terrific Vision
Not since Bugs Bunny and Elmer Fudd has there ever been such a set of rivals as Tom Turkey and Hunter Bob. Hunter Bob just can?t seem to get a turkey today. He?s new to hunting and said he wanted to ?bag his own bird? this Thanksgiving. Tom, on the other hand, isn?t about to let that happen.
Hunter Bob lays low in the bushes but he isn?t fooling Tom. So what gives Tom Turkey an advantage over his rifle wielding foe Bob? How about his superior vision?
In addition to their excellent visual acuity, turkeys also have awesome peripheral vision. Tom?s laterally positioned eyes give him a broader field of view. He has an approximate visual field of 270 degrees around him, substantial compared to Bob?s measly 180 degrees. Put that together with Tom Turkey?s uncanny ability to rotate his neck completely around and he can spot the Bobs of the world coming a mile away, 360 degrees around him, with a simple twist of his head.
The fact that Tom?s eyes are spaced further from each other and are on the sides of his head does give him one small disadvantage; he lacks 3-D vision. Ok, Bob, you got him there. However, turkeys can compensate for their lack of binocularity by using a series of head bobbing movements, much like you may see pigeons do as they walk along the sidewalk in the park. These quick head movements allow their eyes to gather information about relative depths and distances of objects in their surroundings so they can do without true depth perception like Bob?s just fine. Sorry Bob.
The retinas of turkeys have seven different types of photoreceptors including 1 rod and 6 different types of cones, 2 of which are actually ?double cones.? Human retinas have only 4 different types of photoreceptors consisting of 1 rod and 3 single cones. One of Tom?s single cone photoreceptors has a spectral sensitivity to wavelengths near 400nm which is in the UVA light range. It is thought that being able to see UVA light helps birds when they are detecting prey, selecting a mate and foraging for food.
But what advantage (besides bragging rights) does seeing an extended part of the color spectrum give Tom over Bob? Well, you see, Bob is new to hunting and he bought a great new camouflage suit and vest for the occasion. Little did he know that the modern day laundry detergent he used to wash his new camo clothes in contained phosphates and other chemicals which whitened and brightened his clothes. These artificial brighteners also glow a bright blue color to turkeys who can see the ultraviolet light part of the color spectrum. So Bob, you may think you are doing a good job hiding in that natural looking roost you built using bushes and branches, but you might as well be a lost member of the Blue Man Group out here in the woods. It is hard for Tom not to notice someone wearing fluorescent blue clothes! Thanks to artificial brighteners, advantage once again goes to Tom.
Even if there is some way that Hunter Bob isn?t halted by Tom Turkey?s superior visual capabilities, Tom could most likely out run him. Turkeys can run about 20 mph. In contrast, the fastest human in the world has been clocked at running about 28 mph. Let?s say Bob happens to be very fast and is gaining on Tom. Well, Tom could always burst into flight and reach speeds of up to 55 mph. Can you fly, Bob? I think not. Tom Turkey once again proves to be elusive and does so this time with speed and style.
Why, you could even head up to Watkins Glen and attend the Farm Sanctuary?s ?Celebration for Turkeys? event. You could watch turkeys feast on their own thanksgiving dinner of stuffed squash, pumpkin pie and cranberries served to them on silver platters. Maybe even ?adopt a turkey? there.
I guess what I am trying to say is: Bob, just stick to golf.
Happy Thanksgiving, everyone!
Photo credits: (Turkey Eye Exam) created with permission using pictures from Cheryl Murphy and stock photo ?turkey? by Gargi Bhuyan/ stock xchng, (Wild Turkey) stock photo by Yousif Waleed/ stock xchng, (Sammi and Aya eating pie) by Jo-Anne McArthur of We Animals / used with permission from Farm Sanctuary, (Author) Erica Angiolillo/ Gotcha by Erica!
Special Thanks to the Farm Sanctuary, visit their website for more information on how to visit the farm and donate to their farm animal rescue programs.
References:
Dickson, James G. The Wild turkey: biology and management. Mechanicsburg, PA: Stackpole Books, 1992. Print.
Hart NS. The visual ecology of avian photoreceptors. Prog Retin Eye Res. 2001 Sep;20(5):675-703. PMID: 11470455
Hart NS, Partridge JC, Cuthill IC. Visual pigments, cone oil droplets, ocular media and predicted spectral sensitivity in the domestic turkey (Meleagris gallopavo). Vision Res. 1999 Oct;39(20):3321-8. PMID: 10615498
?Keeping UV Brighteners Out of Hunting Clothes.? Great Ghillies & Graphics.com Weblog. Great Ghillies & Graphics.com Weblog, 7 April 2010. Web. 1 Nov 2011.
Leighton, AH. The Turkey Vulture?s Eyes. The Auk. 1928 Jul; 45(3): 352-55.
Wild Turkey Facts. National Wild Turkey Federation, 2010. Web. 1 Nov 2011.
Source: http://rss.sciam.com/click.phdo?i=160b6ab13e0f75ecc1b1a6914a8e5280
rum diary klipsch image s4 chris bosh world series october 28 2011 october 28 2011 jenelle evans
Peering inside the 'deflagration-to-detonation transition' of explosions
Public release date: 22-Nov-2011[ | E-mail |
Share ] Contact: Charles Blue
cblue@aip.org
301-209-3091
American Institute of Physics
Explosions of reactive gases and the associated rapid, uncontrolled release of large amounts of energy pose threats of immense destructive power to mining operations, fuel storage facilities, chemical processing plants, and many other industrial applications.
To gain a better understanding of what's going on during these explosions, US Naval Research Laboratory research physicist Alexei Poludnenko, and Elaine Oran, senior scientist for reactive flow physics, teamed up with Sandia National Laboratories' Thomas Gardiner, principal member of technical staff, to study the deflagration-to-detonation (DDT) transition, which can occur in environments ranging from experimental and industrial systems on Earth to astrophysical thermonuclear supernovae explosions.
The team will present their findings at the upcoming American Physical Society's 64th Annual DFD Meeting, on Nov. 20-22, 2011, in Baltimore, Maryland.
"Explosions are most often driven by flames propagating at relatively slow subsonic velocities," explains Poludnenko. "Under certain conditions, however, this 'slow' mode of burning can transition to a completely different regime detonation, a.k.a. the 'deflagration-to-detonation transition.' In this case, burning is driven by very fast, strong shock waves that can travel at more than 5 times the speed of sound. The power and destructive potential of such detonation-driven explosions is vastly greater than flame-driven ones. Understanding the conditions and physical mechanisms that can cause the transition between these two explosive modes is critical for developing proper preventive and protective measures in industrial settings."
Significant research efforts have been devoted to studying the deflagration-to-detonation transition, and progress has been made in understanding its role in confined systems. Importantly, it was discovered that walls and obstacles are instrumental in detonation formation. For example, burning in a closed space naturally leads to an increase in pressure and the formation of shocks that can be further amplified through reflections with walls and obstacles ultimately producing a detonation.
Walls and obstacles were clearly important in these earlier studies. But scientists also wondered if unconfined flames could be inherently susceptible to the development of detonations.
"We've used detailed computer simulations of flames in hydrogen-air and methane-air mixtures in a fully unconfined environment under atmospheric conditions to study whether detonations can indeed form in such systems," Poludnenko says.
Among their findings: A subsonic flame evolving in the presence of sufficiently intense turbulence can spontaneously form a detonation both in reactive gases on Earth as well as in the interior of the white dwarf stars providing a missing link for the current theoretical models of Type la supernovae (which are formed by the violent explosion of a white dwarf star).
This work is supported by the Naval Research Laboratory and the Air Force Office of Scientific Research. The talk, "Deflagration-to-detonation Transition in Unconfined Media," is at 5:19 p.m. on Sunday, Nov. 20, in Room 326.
Abstract: http://absimage.aps.org/image/MWS_DFD11-2011-001628.pdf
###
MORE MEETING INFORMATION
The 64th Annual DFD Meeting is hosted by the Johns Hopkins University, the University of Maryland, the University of Delaware and the George Washington University. Howard University and the U.S. Naval Academy are also participating in the organization of the meeting. It will be held at the Baltimore Convention Center, located in downtown Baltimore, Md. All meeting information, including directions to the Convention Center, is at: http://www.dfd2011.jhu.edu/index.html
USEFUL LINKS
Main Meeting Web Site: http://www.dfd2011.jhu.edu/index.html
Search Abstracts: http://meeting.aps.org/Meeting/DFD11/Content/2194
Directions and Maps: http://www.dfd2011.jhu.edu/venuemaps.html
PRESS REGISTRATION
Credentialed full-time journalists and professional freelance journalists working on assignment for major publications or media outlets are invited to attend the conference free of charge. If you are a reporter and would like to attend, please contact Charles Blue (cblue@aip.org, 301-209-3091).
SUPPORT DESK FOR REPORTERS
A media-support desk will be located in the exhibit area. Press announcements and other news will be available in the Virtual Press Room (see below).
VIRTUAL PRESS ROOM
The APS Division of Fluid Dynamics Virtual Press Room features news releases, graphics, videos, and other information to aid in covering the meeting on site and remotely. See: http://www.aps.org/units/dfd/pressroom/index.cfm
[ | E-mail | Share ] ?
AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
Public release date: 22-Nov-2011[ | E-mail |
Share ] Contact: Charles Blue
cblue@aip.org
301-209-3091
American Institute of Physics
Explosions of reactive gases and the associated rapid, uncontrolled release of large amounts of energy pose threats of immense destructive power to mining operations, fuel storage facilities, chemical processing plants, and many other industrial applications.
To gain a better understanding of what's going on during these explosions, US Naval Research Laboratory research physicist Alexei Poludnenko, and Elaine Oran, senior scientist for reactive flow physics, teamed up with Sandia National Laboratories' Thomas Gardiner, principal member of technical staff, to study the deflagration-to-detonation (DDT) transition, which can occur in environments ranging from experimental and industrial systems on Earth to astrophysical thermonuclear supernovae explosions.
The team will present their findings at the upcoming American Physical Society's 64th Annual DFD Meeting, on Nov. 20-22, 2011, in Baltimore, Maryland.
"Explosions are most often driven by flames propagating at relatively slow subsonic velocities," explains Poludnenko. "Under certain conditions, however, this 'slow' mode of burning can transition to a completely different regime detonation, a.k.a. the 'deflagration-to-detonation transition.' In this case, burning is driven by very fast, strong shock waves that can travel at more than 5 times the speed of sound. The power and destructive potential of such detonation-driven explosions is vastly greater than flame-driven ones. Understanding the conditions and physical mechanisms that can cause the transition between these two explosive modes is critical for developing proper preventive and protective measures in industrial settings."
Significant research efforts have been devoted to studying the deflagration-to-detonation transition, and progress has been made in understanding its role in confined systems. Importantly, it was discovered that walls and obstacles are instrumental in detonation formation. For example, burning in a closed space naturally leads to an increase in pressure and the formation of shocks that can be further amplified through reflections with walls and obstacles ultimately producing a detonation.
Walls and obstacles were clearly important in these earlier studies. But scientists also wondered if unconfined flames could be inherently susceptible to the development of detonations.
"We've used detailed computer simulations of flames in hydrogen-air and methane-air mixtures in a fully unconfined environment under atmospheric conditions to study whether detonations can indeed form in such systems," Poludnenko says.
Among their findings: A subsonic flame evolving in the presence of sufficiently intense turbulence can spontaneously form a detonation both in reactive gases on Earth as well as in the interior of the white dwarf stars providing a missing link for the current theoretical models of Type la supernovae (which are formed by the violent explosion of a white dwarf star).
This work is supported by the Naval Research Laboratory and the Air Force Office of Scientific Research. The talk, "Deflagration-to-detonation Transition in Unconfined Media," is at 5:19 p.m. on Sunday, Nov. 20, in Room 326.
Abstract: http://absimage.aps.org/image/MWS_DFD11-2011-001628.pdf
###
MORE MEETING INFORMATION
The 64th Annual DFD Meeting is hosted by the Johns Hopkins University, the University of Maryland, the University of Delaware and the George Washington University. Howard University and the U.S. Naval Academy are also participating in the organization of the meeting. It will be held at the Baltimore Convention Center, located in downtown Baltimore, Md. All meeting information, including directions to the Convention Center, is at: http://www.dfd2011.jhu.edu/index.html
USEFUL LINKS
Main Meeting Web Site: http://www.dfd2011.jhu.edu/index.html
Search Abstracts: http://meeting.aps.org/Meeting/DFD11/Content/2194
Directions and Maps: http://www.dfd2011.jhu.edu/venuemaps.html
PRESS REGISTRATION
Credentialed full-time journalists and professional freelance journalists working on assignment for major publications or media outlets are invited to attend the conference free of charge. If you are a reporter and would like to attend, please contact Charles Blue (cblue@aip.org, 301-209-3091).
SUPPORT DESK FOR REPORTERS
A media-support desk will be located in the exhibit area. Press announcements and other news will be available in the Virtual Press Room (see below).
VIRTUAL PRESS ROOM
The APS Division of Fluid Dynamics Virtual Press Room features news releases, graphics, videos, and other information to aid in covering the meeting on site and remotely. See: http://www.aps.org/units/dfd/pressroom/index.cfm
[ | E-mail | Share ] ?
AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
Source: http://www.eurekalert.org/pub_releases/2011-11/aiop-pit112211.php
mlk the big year the big year breast cancer walk breast cancer walk detroit tigers major league
Subscribe to:
Posts (Atom)