Show # 15, Fitness Bands ?Chiseled? - Muscle Works Magazine

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If you have Bodylastics Fitness bands ? you have a workout partner! Come and workout with us almost every day and get Chiseled! In todays episode of ?Chiseled? Blake and Ashanti hit the legs hard with all of the classic leg building exercises. Blake used too much resistance and strained his groin (rats!).

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2 bombs in Baghdad market kill 9 people, wound 50

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Higgs boson buzz goes through ups and downs

CERN / CMS Collaboration

A computer graphic shows a typical Higgs boson candidate event, including two high-energy photons whose energy (depicted by red towers) is measured in the Compact Muon Solenoid's electromagnetic calorimeter. The yellow lines are the measured tracks of other particles produced in the collision. The pale blue volume represents the CMS' crystal calorimeter barrel.

By Alan Boyle

A week ago, sources started passing the word that physicists were "fired up" about further evidence for the existence of the Higgs boson, the last undiscovered particle predicted by the Standard Model and the main quarry for the $10 billion Large Hadron Collider.

That blaze of buzz reached a high point this week, when Columbia mathematician Peter Woit reported "reliable rumors"?that the confidence level for a detection of the Higgs' signature in the mass range of around 125 billion electron-volts, or 125 GeV, was increasing.

"CERN will soon have to decide how to spin this: will they announce discovery of the Higgs, or will they wait for some overwhelmingly convincing standard to be met, such as 5 sigma in at least one channel of one experiment?" Woit wrote.

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"Sigma" refers to the statistical confidence that a given result is more than a fluke, with 5 sigma serving as the gold standard for a discovery. If you're a Higgs-watcher, you'll be hearing a lot about sigma in the next couple of weeks, leading up to the International Conference on High-Energy Physics, or ICHEP, in Australia from July 4 to 11. That's when the LHC's teams are due to provide a status report on the search for the Higgs.?

The Higgs hunt is hot because physicists have hypothesized about the boson for 40 years as part of the mechanism by which some particles acquire mass while others don't. The Higgs is so fundamental to the frontier of physics that Fermilab's Leon Lederman once called it the "God Particle"?? a term that most other physicists positively hate.?Finding it in the mass range where it's expected to be would serve as solid confirmation for the Standard Model, one of the most successful theories in the history of science. Not finding it would be more interesting: Physicists would have to consider some other mechanism, outside the Standard Model, to explain particle mass. And there's nothing theorists love more than a challenge like that.

In December, the teams behind the ATLAS and CMS detectors reported "tantalizing hints" of a Higgs detection at 125 GeV, with confidence levels of 3.6 sigma for ATLAS and 2.6 sigma for CMS. If the additional observations made since then show the same sorts of hints, those sigma levels should go up?? and that's been the gist of the buzz over the last week or so. For science geeks, that's a big deal, or at least a big meme: so big that the hashtag #HiggsRumors was for a time on top of Twitter's trending list, Discovery News' Jennifer Ouelette noted.

A lot of that trending took place because of the in-jokes spawned by the original buzz ??which has now fallen to a steady hum, thanks to a string of reality checks.

"Please do not believe the blogs," ATLAS spokeswoman Fabiola Gianotti told The New York Times. "I am very surprised that rumors appear on a subject that is really evolving daily," CMS spokesman Guido Tonelli told Science News. "The experimenters can't possibly have their data in presentable form yet, so the rumors can't be correct in every detail," Rutgers theoretical physicist Matt Strassler observed on his blog.

Union College physicist Chad Orzel, the author of "How to Teach Relativity to Your Dog," said the celebrity-level hype was?"the price of success":

"I mean, it?s not an accident that there?s a lot of excitement about the maybe-sorta-kinda discovery of the Higgs. This is the product of years of relentless hype from the particle physics community. They've been talking about this goddamn particle for longer than I've been running this blog, and it's finally percolated out into the general public consciousness enough that buzz about it can trend on Twitter. Complaining that your persistent effort to get people to care about particle physics esoterica has led to people being excited about particle physics esoterica seems more than a little churlish.

"So, lighten up. Revel in the success of your hype machine. God knows, if there were a Twitter trending topic about Bose-Einstein Condensation or anything else in atomic physics, I?d do the Happy Dance all the way down the hall. You?ve worked hard to make your elusive particle a celebrity, now reap the rewards."

The true reaping will come in a couple of weeks.?As Reuters' Robert Evans reported, the most recent readings from ATLAS and CMS are being analyzed in isolation, so that one team's conclusions don't influence the other team. Until the ICHEP actually takes place, hype is just about all we'll hear about. But in the meantime, get ready for the real news by reviewing these resources:

Update for 1 p.m. ET June 22: Europe's CERN particle-physics center just announced that the big update on the Higgs search will come on July 4, during a seminar at 3 a.m. ET that's tied to the start of the ICHEP conference.?

"We now have more than double the data we had last year," CERN's director for research and computing, Sergio Bertolucci, was quoted as saying. "That should be enough to see whether the trends we were seeing in the 2011 data are still there, or whether they?ve gone away. It?s a very exciting time."

CERN said that if a new particle is discovered, the ATLAS and CMS teams will need more time to ascertain whether it's the Higgs.

"It's a bit like spotting a familiar face from afar," CERN Director General Rolf Heuer explained. "Sometimes you need closer inspection to find out whether it?s really your best friend, or actually your best friend's twin."

CERN said physicists at the conference in Melbourne will be able to join the seminar via a live two-way link. The seminar will be followed by a news conference at CERN. There'll be a webcast available via?http://webcast.cern.ch. Stay tuned...

---

Alan Boyle is msnbc.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter and adding the?Cosmic Log page?to your Google+ presence. You can also check out?"The Case for Pluto,"?my book about the controversial dwarf planet and the search for new worlds.

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Bright Idea: New "Tractor Beam" Proposal Relies on Light's Negative Radiation Pressure

News | More Science

A layered design would split two key aspects of a light wave, enabling electromagnetic energy to pull objects

By Evelyn Lamb ?| June 20, 2012?|

LIGHT'S POWER A new "tractor beam" proposal would harness the energy of light. Image: Flickr/alanymchan

We?ve long understood black holes to be the points at which the universe as we know it comes to an end. Often billions of times more massive than the Sun, they...

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Tractor beams, a staple of science fiction, may be moving closer to science fact. In a paper published earlier this spring, physicists have proposed a structure that may enable light to pull objects.

Normally, light pushes on objects, albeit weakly. In the field of optical manipulation optical tweezers employ this pushing force to move microscopic objects from atoms to bacteria. The ability to pull as well would increase the precision and scope of optical manipulation. For spaceflight, engineers have proposed sails to capture the force exerted by light.

Rather than towing space vessels, the newly proposed tractor beam might be more useful in biology or medicine. "If you want to pull something towards you, you just reduce the pressure," says Mordechai Segev, a physicist at Technion?Israel Institute of Technology, who describes his team's idea in an April Optics Express paper. "You make a little bit of vacuum," he adds. The problem is that in sensitive medical applications, such as lung surgery, it is important not to change the pressure or introduce any new gases. "Here, the light will be the suction device," he says, "so the pressure would not change at all. It is just the light."

Previous ideas for a "tractor beam" have often focused on creating new gravitational fields to drag objects, heating air to create pressure differences or inducing electric and magnetic charges in objects so that they move against the direction of an incoming laser beam.

The latest proposal takes advantage of a phenomenon called negative radiation pressure. Russian physicist Victor Veselago first theorized its existence in his 1967 paper about materials with an unusual property called negative refraction index. An index of refraction is a number that describes the way light is bent when it goes into a glass lens or other medium, and at the time of the paper nobody knew if this number could be negative in any material. But in the past couple of decades several teams of researchers proved that negative refraction can occur in specially made substances called metamaterials, which have led to limited invisibility cloaks and distortion-free "super" lenses.

The mechanism of negative radiation pressure depends on two aspects of a light wave: its group and phase velocities. A light wave consists groups of smaller waves; the group velocity is the speed and direction of the overall wave group, the phase velocity refers to the speed and direction of a point on one of the smaller constituent waves. The electromagnetic energy of the light wave goes in the direction of the group velocity whereas the wave's effect on a particle goes in the direction of the phase velocity. If these two velocities point in different directions, then negative radiation pressure can result.

The use of metamaterials to move particles via negative radiation pressure has been hindered by the fact that most of these materials are solid, and introducing a gap for particles would eliminate the negative radiation pressure. Additionally, all current metamaterials contain metals, which absorb electromagnetic energy, rendering the pulling effect on particles negligible.

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Asian shares rise as investors bet Fed will 'Twist' again

SINGAPORE (Reuters) - Asian shares rose on Wednesday and the euro clung to most of the previous session's gains as investors bet that Europe's worsening debt crisis and faltering global growth will prompt major central banks to launch a new round of monetary stimulus.

The Federal Reserve concludes a two-day policy meeting later, with expectations high that the U.S. central bank will extend its bond-buying program dubbed "Operation Twist".

"We have seen a clear weakening in the U.S. economy," said Ric Spooner, chief market analyst at CMC Markets in Sydney.

"The strong employment numbers we'd seen earlier look to have been seasonal, so (the Fed) is going to have to look at doing something to improve jobs growth. The question is: will they act now or hold off and use their firepower if or when the euro crisis gets worse?"

MSCI's broadest index of Asia Pacific shares outside Japan <.miapj0000pus> rose 0.5 percent and Japan's Nikkei share average <.n225> climbed 1.2 percent, though European and U.S. markets were expected to ease a touch from Tuesday's gains. <.t/>

The liquidity hit provided by previous doses of Fed stimulus has lifted riskier assets, and financial markets have become highly sensitive to expectations of further moves, with global equities and commodities tending to rise and the dollar coming under pressure when action is seen as increasingly likely.

U.S. stocks rose around 1 percent on Tuesday, European equities advanced 1.6 percent <.fteu3> to a one-month high and Britain's FTSE 100 <.ftse> rose 1.7 percent to a six-week high. Industrial metals and the euro also gained ground. <.n><.eu><.l/>

Spreadbetters called the main European indexes to open down 0.1-0.3 percent on Wednesday and S&P index futures traded down 0.1 percent, pointing to a slightly weaker start on Wall Street.

"It's almost a sure thing that if the Fed fails to deliver to expectations, markets will quickly unwind yesterday's gains, which were premised almost solely on anticipated Fed action," said Cameron Peacock, an analyst at IG Markets in Melbourne.

GLOOMY DATA

U.S. employment, manufacturing and housing data has in recent weeks suggested the recovery in the world's biggest economy is faltering, increasing the chances of action from the Fed, whose policy decision is due at 1630 GMT.

The market consensus was that further quantitative easing or "QE3" - effectively creating money to purchase assets - was unlikely for now, but that an extension of Operation Twist, aimed at pushing down long-term borrowing costs by selling short-term securities to buy longer-term ones, was on the cards.

"There is some, perhaps in our view, misplaced hope for QE3 today," said Mitul Kotecha, head of global foreign exchange strategy for Credit Agricole in Hong Kong. "We believe the Fed will probably extend its Operation Twist, but think QE3 seems unlikely at this stage."

The euro eased a fraction on Wednesday to trade around $1.2677, after rallying nearly 1 percent in the previous session.

Copper also fell, losing about 0.3 percent to fetch around $7,585 a tonne, but oil edged up, with Brent crude gaining 0.2 percent to just below $96 a barrel.

Gold, which tends to be pushed higher by monetary stimulus due to its traditional role as a hedge against inflation, rose around 0.2 percent to about $1,620 an ounce.

EURO RISKS

Although most attention was focused on the Fed, a surprise fall in British inflation strengthened the chance of steps from the Bank of England to support its economy as it feels the heat of the euro zone's problems.

The relief in financial markets at the slim victory for pro-bailout parties in Greece's weekend election has quickly ebbed, with attention switching from fears that Athens could be forced out of the euro zone to the broader concern that contagion from the debt crisis is spreading to Spain and Italy.

Spain lurched closer to becoming the largest euro zone country yet to be shut out of credit markets when it had to pay a euro era record price to sell short-term debt on Tuesday.

European authorities have already agreed to a 100 billion euro rescue for Spain's troubled banks, and a rise in the yield on its 10-year bonds above 7 percent have heightened concerns that the euro zone's fourth largest economy could be driven to seek a full-blown bailout.

"The yield on 10-year government bonds in Spain edged a little lower on Tuesday, but the broader trend upwards over the prior 10 days or so underlines the fact that the banking bailout will not address the country's broader fiscal problems," said Jonathan Loynes, chief Europe economist at Capital Economics, in a note.

"A sovereign bail-out is all but inevitable."

Asian companies are increasingly feeling the global chill.

The region's top firms are less upbeat on their business outlook than in the first quarter, with mounting concern over the euro zone crisis and a slowdown in China's growth, according to the latest Thomson Reuters/INSEAD Asia Business Sentiment Survey, published on Wednesday.

Asked what was the biggest risk factor they face, 111 of the 177 companies polled said global economic uncertainty, and 28 cited rising costs.

(Additional reporting by Luke Pachymuthu and Masayuki Kitano; Editing by Nick Macfie)

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Paddle vs. propeller: Which competitive swimming stroke is superior?

Paddle vs. propeller: Which competitive swimming stroke is superior?

Wednesday, June 20, 2012

Two swimming strokes -- one that pulls through the water like a boat paddle and another that whirls to the side like a propeller -- are commonly used by athletes training for the Olympic Games. But elite swimmers and their coaches have long argued over which arm motion is more likely to propel an aquatic star toward a medal.

A university research study has picked a winner. A team supervised by a Johns Hopkins fluid dynamics expert has found that the deep catch stroke, resembling a paddle, has the edge over sculling, the bent-arm, propeller-inspired motion.

"This is a result that is simple but sweet, which is something we usually struggle to arrive at in research," said Rajat Mittal, a mechanical engineering professor at Johns Hopkins' Whiting School of Engineering. "The deep catch stroke is more efficient and effective than the sculling stroke."

To obtain this result, Mittal's team started with high-precision laser scans and underwater videos of elite swimmers. The researchers then used animation software to bend and otherwise change the shape of the static arm in such a way as to match the video sequence. This software allowed the researcher to insert a "joint" into the arm so that the limb could be moved in a realistic manner. The team then ran computer simulations to study the flow of fluid around the arm and the forces that acted upon the limb. Each simulation involved about 4 million degrees of freedom and required thousands of hours of computer processing time.

The findings concerning the deep catch and sculling strokes were featured in the doctoral thesis of Alfred von Loebbecke, who studied under Mittal, and in a report by Loebbecke and Mittal that has been accepted for publication in the Journal of Biomechanical Engineering.

Mittal, a recreational swimmer, joined the Johns Hopkins faculty in 2009. His research into motion through water began almost a decade ago when, while based at George Washington University, he was awarded a U.S. Navy grant to figure out how fish use their fins to swim so well. To tackle this task, Mittal's team developed software and computer models to study the movement of marine animals.

Mittal later contacted USA Swimming to see if he might use these high-tech tools to crack the secrets of elite swimmers. Russell Mark, the biomechanics coordinator of USA Swimming, was intrigued, and he provided Mittal's team with underwater videos of top swimmers and startup funding. With this support, Mittal and Loebbecke collaborated on studies of the "dolphin kick" used in butterfly events and, increasingly, during starts and turns in freestyle and backstroke races.

After completing that study for USA Swimming, Mittal's team turned its attention to the debate among top coaches about the merits of deep catch and sculling strokes.

In the 1960s, the sculling stroke gained popularity thanks to the late James "Doc" Counsilman, then the head men's swimming coach at Indiana University. Counsilman, highly regarded for his science-based approach to swimming stroke mechanics, also was head coach of the U.S. men's swim team that won a combined 21 gold medals in the 1964 and 1976 Olympic Games. Counsilman encouraged his swimmers to use the propeller-like sculling stroke, in which the elbow is raised to a higher position and the arm moves inward and outward in an S-shaped, propeller-like pattern during the propulsion phase of the stroke, when the swimmer's hand is pushing on the water.

While supervising the current study, Johns Hopkins' Mittal considered Counsilman's reasoning. "A propeller, when it rotates, is producing a lift force, and it is that lift force that pushes a boat forward," Mittal said. "Counsilman believed that to travel efficiently in a fluid, a swimmer should be using lift forces."

This contradicted the advice given by many swimming instructors.

"In the past, the analogy for a swimming stroke was that it was like a paddle in a boat: put the paddle in the water, push it back as hard as possible," Mittal said. "This is called drag-based propulsion. You're actually dragging the water back, and the water drags you forward."

Counsilman insisted that the lift force -- generated by that propeller-like movement -- was a more effective way of producing thrust than drag force. But Mittal and Loebbecke's research suggests that the fluid dynamics of this stroke are more complicated than the renowned coach had imagined.

"Sculling, in my view, is a swimming stroke that is based on an incomplete understanding of fluid mechanics," Mittal said. "We found that Doc Counsilman was not correct overall about the sculling, but in some ways he was more correct than he would have ever thought. We did find that lift is indeed a major component in thrust production for both strokes, and that certainly indicates that the arm does not behave simply like a paddle. However, the simulations also indicate that exaggerated sculling motions, which are designed to enhance and exploit lift, actually reduce both the lift and drag contributions to thrust. So, lift is in fact important, but not in the way envisioned by these early coaches who were trying to bring fluid mechanics into swimming."

Mittal has shared his findings with USA Swimming. He also pointed out that many top swimmers use variations of the classic deep catch and sculling strokes.

Outside of competitive swimming, Mittal's findings could be useful in designing exoskeleton suits that the U.S. Navy is seeking to help elite military forces swim more quickly and efficiently.

At the same time, Mittal said, the research could have more down-to-earth applications by steering recreational swimmers toward the most effective strokes.

"People sometimes stop swimming because they feel they are not doing it well enough," he said. "If this research can help recreational swimmers swim more effectively and feel better about their swimming at an early stage, I think that could have an impact on health and fitness."

###

Johns Hopkins University: http://www.jhu.edu

Thanks to Johns Hopkins University for this article.

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