Sunday, February 3, 2013

Photonics: On track for downsizing

Jan. 31, 2013 ? The ability to miniaturize photonics devices to sizes compatible with computer chips inches closer.

Optical communications, or photonics, technology has failed to match the miniaturization of electronic components, mainly because of fundamental laws of classical optics. The smallest photonic devices are limited to sizes of at least a micrometer. Researchers from the A*STAR Institute of Microelectronics (IME) in Singapore have now realized a device design that beats such size restrictions and can be easily integrated into a silicon chip1.

Using so-called 'plasmonic techniques', the researchers, led by Shiyang Zhu at the IME, demonstrated optical resonator structures, which allow a beam of light to circulate in a closed path, that can be used as on-off switches for light. The device is based on plasmonic effects that guide the light along the surface of the metal. "The performance of our devices is comparable to the best reported results for related plasmonic resonators," says Zhu.

Conventional optical instruments, such as lenses, modify light as it passes through them. Plasmonic structures, however, act more like antennae that amplify light as it moves along their surface. Plasmonic features are typically created using metals such as gold or silver. However, integrating these noble metals with silicon chips is not only expensive, but also requires techniques that are incompatible with established silicon processing techniques.

As a workaround, Zhu and co-workers used copper to generate the desired plasmonic effects. Copper is widely used as electronic wires in silicon computer chips, and it has an established track record in the computer industry. The researchers built their plasmonic resonator devices from two copper structures that guide light along them -- a long wire adjacent to a circle (see image). The smallest width of the copper circuit is only about 180 nanometers, which is much smaller than conventional light guides.

The closeness of the wire and the circle is critical for efficient device operation. When light of a specific wavelength, which is determined by the dimensions of the circle, passes through the wire, some of it can leak into the circle where it becomes trapped. Light can only pass through the structure if it does not match the resonance wavelength of the circle.

The wavelength at which this resonance occurs is very sensitive to parameters such as temperature. In the future, this sensitivity in the circuits could be harnessed for use as switches that control how light passes through the wire, says Zhu. "The next step is to design and demonstrate active plasmonic devices, such as thermo-optic switchers and high-speed electro-optic modulators."

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The above story is reprinted from materials provided by The Agency for Science, Technology and Research (A*STAR).

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


Journal Reference:

  1. Shiyang Zhu, G. Q. Lo, and D. L. Kwong. Performance of ultracompact copper-capped silicon hybrid plasmonic waveguide-ring resonators at telecom wavelengths. Optics Express, Vol. 20, Issue 14, pp. 15232-15246 (2012) DOI: 10.1364/OE.20.015232

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/matter_energy/electronics/~3/-Lc7GY8Jdyo/130203145428.htm

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Sihanouk: Cambodia's last true king

PHNOM PENH, Cambodia (AP) ? When the flames at the cremation ground are quenched and Cambodia's former monarch Norodom Sihanouk's ashes scattered on Phnom Penh's riverfront, the mighty Mekong River may well carry away the country's last true king, a towering figure in a procession of more than 100 monarchs stretching back 2,000 years.

Today, Cambodia has a new king, but he holds little of the power that Sihanouk once wielded. Instead, a poor farmer's son and onetime communist commander, strongman Prime Minister Hun Sen, now occupies the dominant position that Sihanouk represented for years.

For over half a century Sihanouk bestrode this Southeast Asian country like a colossus, wresting independence from France, keeping the opposing Cold War powers at bay while maneuvering adroitly ? at times brutally ? through domestic minefields.

A larger-than-life character, Sihanouk survived wars and the Khmer Rouge reign of terror before succumbing to a heart attack last October at the age of 89. The King-Father, as he is called, will be cremated Monday.

His son, current King Norodom Sihamoni, a gentle man and former ballet dancer, by most accounts ascended the throne reluctantly and does not appear to have inherited any of the father's political skills needed in Cambodia's winner-take-all arena.

Bent on monopolizing power, Hun Sen's regime has not afforded Sihamoni powers guaranteed to the monarchy by the constitution and even restricts the king's movements outside palace walls, according to royalists and political opponents.

Sihamoni's shrinking role and personality, together with the erosion of traditional society, does not bode well for monarchy's long-term future.

"I think the survival of the monarchy after Sihamoni drops off the mortal coil is, at best, a 50-50 bet," says Milton Osborne, an Australian historian and author of a Sihanouk biography.

"He would be much happier if he could go back to France," says Son Soubert, the king's high privy councilor ? or to the Czech Republic. Sihamoni spent 25 years in the two countries, as a student in Prague and Cambodia's ambassador to UNESCO, the cultural body, in Paris.

He has described his time in what was then Czechoslovakia ? "my second homeland" ? as belonging to the "happiest part of my life" and still speaks Czech like a Prague native. Diplomats say that after dinner, usually taken alone, the 59-year-old bachelor loves to read Czech and French theater reviews and watch DVDs of ballets and operas.

"Grandiose, energetic and charismatic, Sihanouk was considered by many as the quintessential 'God-King', a model which contrasts sharply with the quiet, reserved, and circumscribed stance of Sihamoni," says Astrid Noren-Nilsson, a political scientist at Cambridge University. "Whilst Sihanouk was a natural-born, astute politician, Sihamoni does not aspire to any political role."

By contrast, Hun Sen, in power for 28 years after defecting from the Khmer Rouge, says he won't step down until he's 90 and is grooming his three sons for bigger things, the eldest already a two-star general holding key military positions. Hun Sen's brother is a provincial governor, a nephew-in-law serves as national police chief and a daughter recently bought the colonial building that housed Phnom Penh's City Hall. Family members, relatives and political cronies control vast business enterprises.

Bridges, schools and roads across the country bear Hun Sen's name, or that of his powerful wife Bun Rany, and both have had royal-like titles bestowed on them. His is Samdech Akka Moha Sena Padei Techo, or Illustrious Prince, Great Supreme Protector and Famed Warrior. In 2009, the prime minister announced that in a previous life he had been King Korn, a peasant who rose up to usurp the throne in the late 15th century. He has since sponsored statues and a book about the monarch.

Observers note that some of Hun Sen's actions bear an uncanny resemblance to those of Sihanouk, including the latter's hours-long speeches, the forays into the countryside to bond with villagers via handouts and earthy language, and even the two men's propensity to belt out songs in public. Hun Sen, like Sihanouk, brooks no rivals to his power.

However, the government denies it is trying to relegate Sihamoni to the shadows.

Minister of Information Khieu Kanharith says Hun Sen swore a sacred oath before Sihanouk's corpse to protect the monarchy and that relations between the prime minister and Sihamoni are "very good."

"The reason why some people say the king is without power, a prisoner in the palace, is because they compare him to the King-Father. This is wrong," the minister said. "Sihanouk was also head of state involved in politics. The current king is playing the classic role of protecting Cambodian unity, tradition, religion. The king will survive if he is firmly committed to this constitutional role."

To date, Sihamoni has shown little desire to expand his role, staying in the background as long his father was alive. "Now we will see if he can exercise his power. It depends on him, now that he has a free hand. He has to show that he is king," Son Soubert says.

The constitution stipulates that the monarch heads a potentially powerful Supreme Council of National Defense and an annual People's National Congress. But the law enacting the council has languished in draft form since 1993 and there is no draft yet related to the congress. Son Soubert says axing the congress would break a long tradition allowing all citizens direct access to the king.

Sihamoni, his councilor says, has also not been allowed to take some trips abroad, including one on invitation from the Smithsonian Institution in Washington D.C. And diplomats say he would like, if permitted, to take more trips to the countryside, where his father enjoyed his greatest support but where Sihamoni cannot make much of a difference.

"I don't know him very well. I just know that he is the son of the King-Father so I will love him too," said Khim Touch, a 60-year-old farmer from Kampot province who like hundreds of thousands others came to Phnom Penh to pay her last respects to Sihanouk. She recalled Sihanouk once coming to her village to pass out sarongs, rice seeds and cash.

Soung Sophorn, a young human rights lawyer, says the king's popularity is fast diminishing because "people see that he cannot solve their problems compared to what Sihanouk did. The king himself is not strong, brave enough to oppose Hun Sen, and Hun Sen has closed all the doors."

Because of the current king's his isolation, the lawyer says Sihamoni is losing touch with the country's vital majority, the young, while Hun Sen may even gain support from the older generation because he is portraying himself as a Sihanouk admirer as he serves as master of ceremonies at his elaborate funeral.

Others disagree. Nilsson says the mass outpouring of grief and reverence following Sihanouk's death has strengthened the institution although since Sihanouk's abdication in 2004 "the monarchy has increasingly moved to become a decorative monarchy along the lines of Western European constitutional monarchies."

"The passing of Sihanouk can be understood as the end-point of this longer process, cementing the role of the monarchy as a strictly constitutional one," she says. "Since Sihamoni carries himself as a strictly constitutional monarch, the monarchy no longer poses any challenge to Hun Sen, and Hun Sen will have no reason to act against the monarchy."

The royalists themselves wrestle with how to deal with Sihanouk's complex legacy. The young king abdicated the throne for the first time in 1955 to assume various political leadership roles, including head of state for life, although he was back on the throne later. Sihanouk in fact eroded kingly power while retaining the aura of kingship in the eyes of the general population.

Exactly what kind of a mantle Sihamoni may assume remains to be seen, but Osborne says that for now the monarchy remains important for Cambodia's sense of national identity, at least among some segments of the population. And Geoffrey Gunn, a Southeast Asia expert at Japan's Nagasaki University, adds that at times of national crisis royalty can be wielded as a rallying national symbol.

"I think Hun Sen understands that he cannot diminish the status of the monarchy to irrelevance," Gunn says.

Source: http://news.yahoo.com/sihanouk-cambodias-last-true-king-085148410.html

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Kerala Tour Packages Dooars Package Tours

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Source: http://www.articlesnatch.com/Article/Kerala-Tour-Packages-Dooars-Package-Tours/4414075

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Fast food linked to higher asthma and allergy risk | MNN - Mother ...

Fast food linked to higher asthma and allergy risk

New study links fast-food consumption to a greater risk for developing asthma, eczema and allergies.

Tue, Jan 15 2013 at 8:56 AM

Teens and kids who eat a lot of fast food may be at greater risk for developing asthma, eczema?and allergies, according to a new study published in the British Medical Journal's respiratory magazine,?Thorax.

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For the study, researchers from?the University of Auckland in New Zealand and the University of Nottingham in the United Kingdom looked at surveys from more than 500,000 kids in 51 countries to determine how diet affected their allergy-related risks. They found that?eating fast food three times a week may lead to asthma, eczema?and itchy, watery eyes in children. ?

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Researchers surveyed kids and their parents to determine whether or not they experienced symptoms of allergies, asthma and eczema. Participants also shared what types of foods they consumed each week. In the study, children in their early teens who ate fast food three or more times each week had a 39 percent greater risk of severe asthma. For 6- and 7-year-olds, there was a 27 percent increased risk. Overall, kids who ate fast food three or more times a week had about a 30 percent increased risk of severe allergies. The results were consistent across all age groups regardless of gender or socioeconomic status. ?

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Interestingly, kids who ate fruit were able to cut their risk of developing these conditions. Researchers found that kids who ate three or more portions of fruit each week reduced their risk of severe asthma, eczema and allergies by between 11 and 14 percent.

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Related allergies and asthma stories on MNN:

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Source: http://www.mnn.com/health/fitness-well-being/blogs/fast-food-linked-to-higher-asthma-and-allergy-risk

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Armenian presidential hopeful shot, vote uncertain

YEREVAN, Armenia (AP) ? A midnight shooting attack on a presidential candidate threw Armenia's election into disarray Friday, raising the prospect that the vote could be postponed.

Paruir Airikian, 63, was shot and wounded by an unidentified assailant outside his home in Yerevan, the Armenian capital, just before midnight. He was recuperating Friday after surgery.

He is one of eight candidates in the Feb. 18 race in this landlocked former Soviet republic and wasn't expected to get more than 1 percent of the vote. But the attack might force authorities to delay the election, a move that could help opponents of President Serge Sarkisian, who was expected to easily win a second five-year term.

Sarkisian said after visiting Airikian in the hospital that the perpetrators of the attack "obviously had an intention to influence the normal election process."

The attack was "a provocation against democratic, free and transparent elections," said Eduard Sharmazanov, the deputy speaker of Parliament.

Armenia ? a landlocked nation of 3 million people bordering Azerbaijan, Georgia, Iran and Turkey in the volatile Caucasus ? has been known for its turbulent and often violent politics. A 1999 attack on Parliament by six gunmen killed the prime minister, the speaker and six other officials and lawmakers.

In 2006, a deputy chief of tax police was blown up his car. Police tracked down the man who placed explosives in the vehicle, but failed to determine who ordered the killing.

In March 2008, clashes between police and supporters of former President Levon Ter-Petrosian, who lost to Sarkisian in a vote the previous month, left 10 people dead and more than 250 injured. Later that year, a deputy police chief was shot and killed in the elevator of his apartment building, a slaying that remains unsolved.

Sarkisian, a conservative, has stolen the opposition's thunder by talking with critics and allowing opposition protests. In 2009, the Parliament granted a sweeping amnesty to hundreds of people detained for taking part in the post-election violence.

Sarkisian also has overseen a return to economic growth after years of stagnation and has managed to reduce the country's endemic poverty. Recent opinion surveys show him getting the support of up to 70 percent of the population.

"Sarkisian has a clear advantage ... and he doesn't need destabilization," said Stepan Grigorian, an independent political analyst. He said Sarkisian is poised to win the vote anyway, but if he performs worse than initially expected, that could give more leverage to fringe groups. "That could make the president more dependent on such marginal groups," said Grigorian.

Sarkisian's closest rival is Raffi Hovanessian, a former foreign minister who has campaigned on populist promises to sharply increase state salaries and pensions. Hovanessian also has pledged to recognize the independence of Nagorno-Karabakh, a stance favored by nationalists. The Nagorno-Karabakh region of Azerbaijan and some adjacent territory have been under the control of Armenian troops and local ethnic Armenian forces since a 6-year war ended with a truce in 1994.

Armenia has faced severe economic challenges caused by the closing of its borders with Azerbaijan and Turkey because of the conflict and international efforts to mediate a settlement have produced no result. Sarkisian, like his predecessors, has stopped short of recognizing the territory as independent.

At the same time, he has taken a tough stance on other foreign policy issues, pushing strongly for international recognition that the killings of some 1.5 million Armenians by Ottoman Turks in 1915 constituted genocide. Turkey has furiously opposed that.

Armenian Parliament Speaker Ovik Abramian, who visited the wounded candidate in the hospital, said Friday that the attack was a "blow to the Armenian statehood" and that the election could now be delayed. The nation's election chief, however, refused to comment on the possibility.

Armenia's constitution requires the vote to be postponed for two weeks, if one of the candidates is unable to take part due to circumstances beyond his control. A further 40-day delay beyond that is also possible.

Sarkisian, meanwhile, canceled a meeting with voters set for Friday, and his headquarters said his campaign ads wouldn't be broadcast that day.

Yerevan Clinical Hospital's chief doctor, Ara Minasian, said Airikian was being treated for a single gunshot wound and remained in stable condition. Doctors operated to remove a bullet in his shoulder.

Airikian, an also-ran in three previous Armenian presidential elections, was a dissident during Soviet times. He was first arrested when he was 20, and spent 17 years in prison, according to his party.

In 1987, after Soviet leader Mikhail Gorbachev launched his liberal reforms, Airikian created the National Self-Determination Party. When the conflict between Armenia and Azerbaijan erupted the next year, he accused the Soviet authorities of stirring up violence and was evicted from the country.

Airikian soon returned to his homeland and in the 1990s had senior positions in Armenia's parliament and government.

Source: http://news.yahoo.com/armenian-presidential-hopeful-shot-vote-uncertain-132842655.html

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Saturday, February 2, 2013

Employment report points to steady economic growth

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Job seeker fills out forms at career fair in New York CityWASHINGTON (Reuters) - Employment grew modestly in January and gains in the prior two months were bigger than initially reported, supporting views the economy's sluggish recovery was on track despite a surprise contraction in output in the final three months of 2012. Employers added 157,000 jobs to their payrolls last month, the Labor Department said on Friday. There were 127,000 more jobs created in November and December than previously reported. The unemployment rate, however, edged up 0.1 percentage point to 7.9 percent. ...


Source: http://news.yahoo.comfinance.yahoo.com/news/jobs-data-point-steady-economic-115023705.html

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Mozambique floods: Death toll rises to 55

MAPUTO, Mozambique (AP) ? The United Nations says the death toll from the flooding in Mozambique has risen by seven to at least 55 people.

The U.N. said Thursday that heavy rains in northern and central Mozambique have displaced 19,000 more people, raising the total number of displaced by floods the past two weeks to nearly 170,000.

The Mozambican government said there is a shortage of food for flood victims in southern Mozambique. Luis Nhala, a health official, said that residents are eating food that has mixed with contaminated flood water, which is resulting in cases of diarrhea and vomiting.

Mozambican state television showed children in need of food and water. One man held an empty plate and told the camera: "Look, we are starving. The government must do something."

Source: http://news.yahoo.com/mozambique-floods-death-toll-rises-55-145721186.html

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