Saturday, November 10, 2012

New way of making glass

ScienceDaily (Nov. 9, 2012) ? A new way to make glass has been discovered by a collaboration of researchers at the Universities of D?sseldorf and Bristol using a method that controls how the atoms within a substance are arranged around each other.

The research is published November 9 in Physical Review Letters.

When cooling a liquid below its melting temperature it either crystallizes or transforms into a glass. Glass is a peculiar state of matter: it has the mechanical properties of a solid but an amorphous structure like a liquid.

As long ago as 1952, Sir Charles Frank at the University of Bristol argued that the structure of glasses should not be entirely disordered like a liquid but rather that it should be filled with structural motifs like the bicapped square antiprism [inset pictured].

Although such motifs have very recently been found in experiments and computer simulations on glassy materials, it has not been clear what role these play in how a liquid becomes a (glassy) solid.

The D?sseldorf and Bristol researchers created a new type of glass in a computer through encouraging atoms in a nickel-phosphorus alloy to form the pictured polyhedron. When these polyhedra formed, the liquid no longer flowed -- it had become a solid. In other words, they found that instead of cooling, a liquid can turn into a glass by changing its structure.

Dr Paddy Royall of the University of Bristol said: "The method we developed employed computer simulations of liquids, performed on the University of Bristol's BlueCrystal supercomputer, where the atoms were driven to form more polyhedra.

"Although many more polyhedra were formed, the atomic arrangements were still disordered rather than a periodic arrangement as seen in crystals. This means that the solid that was formed had to be a glass."

Dr Thomas Speck of Heinrich-Heine-Universit?t, D?sseldorf said: "These results mean that structure can control whether a material is liquid or solid and thus open the way to design new glasses: for example metallic glasses whose great lightness and strength promise exciting applications and chalcogenide glasses which are used in memory applications and phase switch memory, a possible future technology for data storage."

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The above story is reprinted from materials provided by University of Bristol.

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


Journal Reference:

  1. thomas Speck, Alex Malins, and C. Patrick Royall. First-Order Phase Transition in a Model Glass Former: Coupling of Local Structure and Dynamics. Phys. Rev. Lett., 109, 195703 (2012) DOI: 10.1103/PhysRevLett.109.195703

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

Disclaimer: Views expressed in this article do not necessarily reflect those of ScienceDaily or its staff.

Source: http://feeds.sciencedaily.com/~r/sciencedaily/most_popular/~3/5xTLWUGE4Dw/121109111515.htm

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Friday, November 2, 2012

Deputy's role places him in teens' corner to help | cranford, children ...

RANCHO SANTA MARGARITA ? On a recent afternoon, Sheriff's Deputy Clay Cranford spent time listening to a depressed teen who talked about cutting herself.

He met with another teen who'd had brought a weapon to school. He counseled several others about the dangers of online crime and bullying.

"Ultimately, I want to make a difference with people every day," Cranford said. "I want to turn things around for people who are in distress. In jails, you see the same people come back time after time. With kids, their paths are wide open. I have the most opportunity to make a difference. They're malleable and they want to do the right thing."

Cranford, 40, was selected from among other applicants to become the city's new Child Safety Deputy. His role is three-fold: He monitors locally registered sex offenders with histories of crime against children, does community crime prevention including talks on burglary, retail thefts and watches for trends that threaten children. He also does enforcement.

The position, the first of its kind in the Orange County Sheriff Department, was created by Lt. Brian Schmutz, Rancho's police chief. Unlike a school resource officer, Cranford's role is not limited to schools. He's responsible for child safety throughout the community.

Schmutz said in the last three years, deputies have responded to about 300 calls each year at local schools on issues involving children. In 2011, the department handled 123 incidents that involved "a suspicious person" and children. In some cases these calls involved juveniles who were drinking, involved in vandalism or using drugs, Schmutz said. In other cases, it involved "a suspicious person" that was following, photographing or trying to contact children.

Schmutz said the idea for the position was born out of necessity. The city's police services lost several positions over the years because of the economy's downturn. By combining the duties of the former crime prevention specialist with the former school resource officer, Schmutz created a blueprint for the Child Safety Deputy position.

"By combining a school presence, crime prevention education, and enforcement, this new position serves many functions that used to require a number of personnel," Schmutz said. "The biggest reason that we started this program is to ensure that the city's police services can pay special attention to the safety of all children in the city."

Parents and kids in Rancho like Cranford's job. Many children who hang out at the city's Central Park after school say they feel safer since he's been around. Parents say he's helped open their eyes to threats targeting children.

"I think it's really cool he patrols Rancho Santa Margarita Intermediate and makes sure it's safe," said John Sigala, 12, adding that Cranford has also helped him deal with teen issues. "For me and other short people, we get teased a lot. But to me it's just like water off a duck's back. But some kids don't take it as well as others."

For Nancy and Tim Lavender, who have a 12-year-old daughter and 15-year-old son, a recent seminar Cranford held at Rancho Santa Margarita Intermediate about online dangers and cyber bullying provided an eye-opening experience. In the presentation, Cranford included a video made by Amanda Todd, a Canadian teen who begged for help after being victimized by online bullying. Todd, much like Lake Forest's Jonah Mowry, had made a YouTube video using note cards to talk about what happened to her after she exposed her breasts to what she thought was a friend online. Todd committed suicide about two weeks ago after relentless bullying,

"I was sitting at the presentation crying," said Nancy Lavender. "I was thinking about what these young girls are hearing and what they're exposed to by being bullied."

Part of Cranford's seminar included things to watch for. The deputy talked about teens accessing text messaging apps like SnapChat, Kick and Thumb, ? some of which don't require authentication of identities to use them. Cranford warned about pass code locks on phones and reluctance by teens to turn over those codes to parents when asked.

When the Lavender's got home, they discussed the dangers with their children and later learned that their son had been involved in an online chat with two girls who claimed to be 17-year-olds. The content of the texts made the Lavender's wary.

"I don't think the girls were who they represented themselves to be," Tim Lavender said.

Unsure about how to confront their son, they asked Cranford. He responded immediately and offered to come over. He was friendly and talked to the couple's son in a way a 15-year-old could relate, Nancy Lavender said.

"I think it was an eye-opener for him and made him think about who really could be on the other end," she added.

"This is the best thing we could have done," she said about asking Cranford for help. "I didn't want to ambush him. But I wanted to scare him about what could be out there. I want other parents to realize, it's not just about checking cell phones, it's about getting this into their heads ? that it's dangerous."

Cranford said he shared personal stories with the teen and explained what kinds of dangers exist online. He talked about "creepers," someone that tries to lure teens and later tries to manipulate them. This can go on for as long as a year while the teen is being groomed, Cranford said.

"Kids don't have the perspective that comes through having life experiences," Cranford said. "They don't realize what actual risks they're taking. The stakes are much higher now with kids. The stuff they do lives in infamy online."

Contact the writer: 949-454-7307 or eritchie@ocregister.com or twitter.com/lagunaini


Source: http://www.ocregister.com/news/cranford-376380-children-online.html

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Thursday, November 1, 2012

Syrians wary of US push to overhaul opposition

FILE - In this Thursday Jan. 26, 2006 file photo, Riad Seif, a leading Syrian opposition figure and a member of the opposition Syrian National Council, speaks a week after his release from prison in Damascus, Syria. Members of Syria's opposition-in-exile bristle at the Obama administration's suggestion that Washington will handpick more representative leaders including Seif at a crucial conference in Qatar next week. The new U.S. push appears aimed at creating a unified body that could work more closely with the West, but groups both inside Syria and out will likely resist over concerns that foreign countries will dictate the course of their civil war. (AP Photo/Bassem Tellawi, file)

FILE - In this Thursday Jan. 26, 2006 file photo, Riad Seif, a leading Syrian opposition figure and a member of the opposition Syrian National Council, speaks a week after his release from prison in Damascus, Syria. Members of Syria's opposition-in-exile bristle at the Obama administration's suggestion that Washington will handpick more representative leaders including Seif at a crucial conference in Qatar next week. The new U.S. push appears aimed at creating a unified body that could work more closely with the West, but groups both inside Syria and out will likely resist over concerns that foreign countries will dictate the course of their civil war. (AP Photo/Bassem Tellawi, file)

In this picture taken on Wednesday Oct. 31, 2012, a citizen journalism image provided by Lens Young Homsi, which has been authenticated based on its contents and other AP reporting, buildings which were destroyed from the shelling by Syrian forces loyal to Syrian president Bashar Assad, at al-Qossour neighborhood in Homs province, central Syria. Syrian warplanes fired missiles at opposition strongholds around Damascus and in the north on Wednesday as Turkey, a key backer of the anti-regime rebels, appeared to distance itself from an earlier call to impose a no-fly zone. (AP Photo/Lens Yong Homsi)

BEIRUT (AP) ? Members of Syria's opposition-in-exile bristled Thursday at the Obama administration's suggestion that Washington will handpick more representative leaders at a crucial conference in Qatar next week.

The new U.S. push appears aimed at creating a unified leadership that could work more closely with the West. But there are signs of resistance among deeply fractured opposition groups wary of attempts by foreign backers to dictate strategy in the civil war against President Bashar Assad.

"This direct tutelage and these dictates are not acceptable to the Syrian people anymore," said Zuhair Salem, the London-based spokesman for Syria's banned Muslim Brotherhood opposition group. The Brotherhood is part of the main political opposition group, the Syrian National Council, which is dominated by exiles.

Syrians and the U.S. administration have grown increasingly frustrated as the opposition proved unwilling or unable to coalesce. The U.S. and its allies have long bemoaned the lack of a cohesive leadership, and there is little doubt that this has held back more robust foreign aid and involvement to bolster the opposition in its fight.

With the battle for control of Syria almost certainly to be decided on the battlefield, the political opposition led by exiles is being further sidelined.

On Wednesday, the Obama administration said it would push for a major shakeup in the opposition leadership so that it better represents the fighters risking their lives on the frontlines. At least 36,000 people have been killed since the uprising began 19 months ago, according to anti-regime activists.

It was a signal that Syria's political opposition is increasingly irrelevant, as it's become clearer that the conflict will be decided by fighters.

U.S. Secretary of State Hillary Rodham Clinton said the administration was suggesting names and organizations that should feature prominently in any new rebel leadership that is to emerge from a four-day conference starting Sunday in Doha, the capital of Qatar.

The U.S. said a revamped leadership could rally wider international support and help buffer against attempts by extremists among the rebels to hijack the uprising.

Syrian opposition figures have called on the U.S. and other Western supporters to provide the rebels with strategic weapons, such as anti-aircraft missiles, to counter the Assad regime's military superiority and help the rebels break the battlefield stalemate. However, the U.S. has been cool to the idea. It fears that such weapons could fall into the hands of radical Islamists fighting on the rebel side who might one day use them against the U.S. and its allies.

The SNC is widely seen as ineffective and cut off from those fighting on the ground. It has been plagued by infighting and defections. Still Clinton's portrayal of the SNC leadership as out-of-touch exiles kicked up a storm of disapproval inside and outside Syria.

Salem said Clinton's remarks show the U.S. wishes to "tailor the Syrian opposition to specific demands."

The U.S is pushing for a greater role for the rebel Free Syrian Army, the main fighting force on the ground, among other groups. However, the FSA and the Syria-based National Coordination Body, made up of veteran opposition figures, appear skeptical that the disparate opposition groups can fit under one umbrella.

Faiz Amru, a Syrian army general who defected earlier this year, said any transitional government or body created abroad cannot possibly represent those dying in Syria.

"Everyone is trying to push their own agendas," he said dejectedly by phone from the Turkish Syrian border. "The big powers have hijacked the Syrian revolution."

Amru said he does not support any opposition group, saying that none of them care about fighters on the ground.

The U.S. administration responded to the criticism by saying it was not issuing dictates.

"We're not giving them a list," said State Department spokesman Mark Toner. "Ultimately it's up to the Syrians themselves to make those choices. This is in no way telling them what to do."

But Clinton's remarks were seen as damaging by opposition leaders and ordinary Syrians long wary of U.S. meddling in the region. The opposition has been increasingly frustrated by what it perceives as the lack of a coherent U.S. plan to help the rebels.

Muhydin Lazikani, a London-based writer and SNC member, said Clinton had no business criticizing the SNC at a time when the Obama administration has not charted a path for Syria.

"All they try to do is blame the SNC," said Lazikani.

Mohammad Sarmini, a Turkey-based SNC spokesman, said the U.S., through this new push, is "trying to make up for its shortcomings and impotence to stop the killings and massacres in Syria."

Shadi Hamid of the Brookings Doha Center was also critical of the U.S. approach.

"The U.S. does not seem to have a real end game here," he said. "Where does this lead? What happens after you have a unified opposition? It will still have to be fought out between armed groups."

The shift in the U.S. position came after months of fruitless attempts by the Obama administration and its allies to cajole the notoriously fractious SNC to broaden its base, according to two American officials.

The U.S. wants the SNC to include representatives of all Syria's diverse ethnic and religious groups as well as members of the armed opposition not affiliated with extremist groups or causes, said the officials, speaking on condition of anonymity because they were not authorized to discuss the plans publicly.

Those potential members, including opposition figure Riad Seif, are among hundreds of opposition figures that U.S. diplomats have been impressed with in discussions during the course of the crisis, the officials said. Seif is a former reformist lawmaker who was frequently jailed even before the uprising began.

Syrian opposition leaders confirmed that Seif was among the top candidates being considered to head a transitional government. Seif, who suffers from cancer, was beaten up by security forces at a protest in October last year before he finally left the country. He could not immediately be reached for comment Thursday.

In addition to a greater role for the Free Syrian Army, the U.S. is also pushing for more representation of local coordinating committees and the mayors of liberated cities who are already displaying skills at local leadership and governance, the officials said.

Some have accused the fundamentalist Brotherhood of dominating the Turkey- and Qatar-backed SNC and using it as a front. Different branches of the Brotherhood have been gaining power across the Middle East in Arab Spring uprising against dictatorships ? particularly in Egypt where the group now holds the presidency and dominated in parliamentary elections.

Hundreds of Syrian opposition figures are expected to take part in the Doha conference. They will aim to choose a new leadership, said George Sabra, an SNC spokesman. More than 400 delegates are to select a 40-member general secretariat, a 15-member executive bureau and a new leader.

The conference will discuss the possibility of setting up a transitional government for Syria, but it is not expected to declare the formation of that body.

___

Associated Press writers Mathew Lee in Washington and Bradley Klapper in Shannon, Ireland, contributed to this report.

Associated Press

Source: http://hosted2.ap.org/APDEFAULT/3d281c11a96b4ad082fe88aa0db04305/Article_2012-11-01-Syria-Opposition/id-6310d3e07fca41d19ae166d34d72acbb

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