Researchers collaborate on system to extend battery lifespan in devices






SINGAPORE: Researchers from Singapore and the US are collaborating to come up with a system that can extend the lifespan of batteries in devices such as laptops and smartphones.

The Institute of Microelectronics (IME) and Stanford University will work to advance innovations in nano-electromechanical systems (NEMS).

NEMS technology is known for its higher energy efficiency.

The system has the ability to stamp out leakage currents that occur during passive standby mode in electronic devices.

Leakage current is one of the leading sources of power consumption in digital systems, using traditional semiconductor switches.

By replacing these traditional switches with NEMS switches, the total power consumption of a digital block can be reduced by up to 10 times.

Dr Lee Jae Wung, the IME Scientist leading the project, said: "One of the challenges in building a reliable NEMS switch is in achieving Thin Film Encapsulation to protect the switch structure and the contact materials from degradation and oxidation by providing proper vacuum condition and/or filling inert gas inside the cavity. IME's capabilities in back end of line compatible materials and processes are expected to contribute strongly in this area."

"NEMS relay has proven to be an effective complement to conventional Si CMOS technology for reducing power consumption. The collaboration with IME will advance this device technology to a manufacturing process that is suitable for co-integration with Si CMOS in practical applications," said Professor Philip Wong, Willard R. and Inez Kerr Professor in the School of Engineering at Stanford University.

The Institute of Microelectronics (IME) is a research institute of the Science and Engineering Research Council of the Agency for Science, Technology and Research (A*STAR).

- CNA/ck



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They should answer if they can run a government, says Bengal governor

KOLKATA: Under pressure from an angry police force and a stung city, chief minister Mamata Banerjee on Thursday reacted in haste and shunted police commissioner R K Pachnanda, making him the scapegoat for the political bungling over sub-inspector Tapas Chowdhury's death.

Surajit Kar Purakayastha was named the new police chief.

Pachnanda's removal triggered a stinging reaction from governor M K Narayanan, who said if the top cop's transfer had something to do with what happened in the last few days, "clearly, there is something that is wrong and we will have to look into it".

Asked if he would intervene, the governor said: "That you leave to me. We are a democracy, we have a government that was elected with a massive mandate. I presume they should answer whether they are capable of running a government or not. The governor cannot answer that, he can only act."

The abrupt transfer triggered severe resentment among police officers as well. Although it was Firhad Hakim - a powerful minister in Mamata's cabinet - who prevented the police from taking action in the case, Pachnanda was made the fall guy to save the image of the government, and Mamata herself.

In fact, it was Narayanan's tough talking earlier in the day that had forced Mamata to act. During a visit to the slain officer's residence in Thakurpukur, Narayanan said, "Law and order in the state needs to be restored immediately... No one has any business shielding the accused. Those named in the FIR should be arrested." It was a clear hint at Hakim's clean chit to aide Md Iqbal, whose bodyguard Suvan is suspected to be the shooter. Hakim had publicly said on Wednesday there was no need for further arrests. Narayanan minced no words. "Whoever has said so should not have made the remark," he said.

Hakim has got away clean - so far - in spite of accompanying Iqbal to the trouble spot just after the cop's murder. He had blatantly tried to pass the blame on Congress and even briefed the CM that way. Hakim was so brazen that leader of the opposition Surjya Kanta Mishra remarked that "the urban development minister is behaving like the home minister and the home minister (Mamata) acting like the tourism minister". Mamata was in Tekkhali the day of the murder and spent the next day in Digha.

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Study: Fish in drug-tainted water suffer reaction


BOSTON (AP) — What happens to fish that swim in waters tainted by traces of drugs that people take? When it's an anti-anxiety drug, they become hyper, anti-social and aggressive, a study found. They even get the munchies.


It may sound funny, but it could threaten the fish population and upset the delicate dynamics of the marine environment, scientists say.


The findings, published online Thursday in the journal Science, add to the mounting evidence that minuscule amounts of medicines in rivers and streams can alter the biology and behavior of fish and other marine animals.


"I think people are starting to understand that pharmaceuticals are environmental contaminants," said Dana Kolpin, a researcher for the U.S. Geological Survey who is familiar with the study.


Calling their results alarming, the Swedish researchers who did the study suspect the little drugged fish could become easier targets for bigger fish because they are more likely to venture alone into unfamiliar places.


"We know that in a predator-prey relation, increased boldness and activity combined with decreased sociality ... means you're going to be somebody's lunch quite soon," said Gregory Moller, a toxicologist at the University of Idaho and Washington State University. "It removes the natural balance."


Researchers around the world have been taking a close look at the effects of pharmaceuticals in extremely low concentrations, measured in parts per billion. Such drugs have turned up in waterways in Europe, the U.S. and elsewhere over the past decade.


They come mostly from humans and farm animals; the drugs pass through their bodies in unmetabolized form. These drug traces are then piped to water treatment plants, which are not designed to remove them from the cleaned water that flows back into streams and rivers.


The Associated Press first reported in 2008 that the drinking water of at least 51 million Americans carries low concentrations of many common drugs. The findings were based on questionnaires sent to water utilities, which reported the presence of antibiotics, sedatives, sex hormones and other drugs.


The news reports led to congressional hearings and legislation, more water testing and more public disclosure. To this day, though, there are no mandatory U.S. limits on pharmaceuticals in waterways.


The research team at Sweden's Umea University used minute concentrations of 2 parts per billion of the anti-anxiety drug oxazepam, similar to concentrations found in real waters. The drug belongs to a widely used class of medicines known as benzodiazepines that includes Valium and Librium.


The team put young wild European perch into an aquarium, exposed them to these highly diluted drugs and then carefully measured feeding, schooling, movement and hiding behavior. They found that drug-exposed fish moved more, fed more aggressively, hid less and tended to school less than unexposed fish. On average, the drugged fish were more than twice as active as the others, researcher Micael Jonsson said. The effects were more pronounced at higher drug concentrations.


"Our first thought is, this is like a person diagnosed with ADHD," said Jonsson, referring to attention deficit-hyperactivity disorder. "They become asocial and more active than they should be."


Tomas Brodin, another member of the research team, called the drug's environmental impact a global problem. "We find these concentrations or close to them all over the world, and it's quite possible or even probable that these behavioral effects are taking place as we speak," he said Thursday in Boston at the annual meeting of the American Association for the Advancement of Science.


Most previous research on trace drugs and marine life has focused on biological changes, such as male fish that take on female characteristics. However, a 2009 study found that tiny concentrations of antidepressants made fathead minnows more vulnerable to predators.


It is not clear exactly how long-term drug exposure, beyond the seven days in this study, would affect real fish in real rivers and streams. The Swedish researchers argue that the drug-induced changes could jeopardize populations of this sport and commercial fish, which lives in both fresh and brackish water.


Water toxins specialist Anne McElroy of Stony Brook University in New York agreed: "These lower chronic exposures that may alter things like animals' mating behavior or its ability to catch food or its ability to avoid being eaten — over time, that could really affect a population."


Another possibility, the researchers said, is that more aggressive feeding by the perch on zooplankton could reduce the numbers of these tiny creatures. Since zooplankton feed on algae, a drop in their numbers could allow algae to grow unchecked. That, in turn, could choke other marine life.


The Swedish team said it is highly unlikely people would be harmed by eating such drug-exposed fish. Jonsson said a person would have to eat 4 tons of perch to consume the equivalent of a single pill.


Researchers said more work is needed to develop better ways of removing drugs from water at treatment plants. They also said unused drugs should be brought to take-back programs where they exist, instead of being flushed down the toilet. And they called on pharmaceutical companies to work on "greener" drugs that degrade more easily.


Sandoz, one of three companies approved to sell oxazepam in the U.S., "shares society's desire to protect the environment and takes steps to minimize the environmental impact of its products over their life cycle," spokeswoman Julie Masow said in an emailed statement. She provided no details.


___


Online:


Overview of the drug: http://www.nlm.nih.gov/medlineplus/druginfo/meds/a682050.html


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Dorner Confirmed Dead in Autopsy on Cabin Remains












Christopher Dorner, the ex-Los Angeles police officer who declared himself on a killing spree against his former law enforcement colleagues, is dead.


Authorities this evening confirmed that remains found after a fiery standoff at a California mountain cabin Tuesday were, in fact, Dorner's.


"The charred human remains located in the burned out cabin in Seven Oaks have been positively identified to be that of Christopher Dorner," the San Bernardino County Sheriff-Coroner's Office said in a written statement. "During the autopsy, positive identification was made through dental examination."


FULL COVERAGE: Christopher Dorner Manhunt


PHOTOS: Former LAPD Officer Suspected in Shootings


In a 6,000-word "manifesto," Dorner outlined his anger at the Los Angeles Police Department for firing him, and made threats against individuals he believed were responsible for ending his career with the police force five years ago. Dorner was fired after filing what the LAPD determined to be a false report accusing other cops of brutality.


Dorner is suspected of killing four people, including Monica Quan and her fiance, who were found shot to death Feb. 3. Quan was the daughter of former LAPD Capt. Randal Quan, who was mentioned as a target of Dorner's fury in the manifesto.








Christopher Dorner Hostages: 'I Thought We Were Dead' Watch Video









Christopher Dorner Hostages: 'He Just Wanted to Clear His Name' Watch Video









Christopher Dorner Believed Dead After Shootout With Police Watch Video





Dorner is also suspected in the shooting death of Riverside, Calif., Police Officer Michael Crain, whose funeral was Wednesday.


San Bernardino Sheriff's Deputy Jeremiah MacKay, 35, a 15-year veteran and the father of two children, was killed in Tuesday's shootout at the cabin.


A second San Bernardino County sheriff's officer had to undergo multiple surgeries after he was wounded in the cabin shootout, and other officers also were wounded in earlier alleged encounters with Dorner.


After Crain's death, police tracked Dorner to the Big Bear Lake area of Southern California, where his burning truck was found in the mountains late last week.


A couple with a cabin in the area were some of the last people to see Dorner before his final encounter with police. Their 911 call to police triggered a chase that concluded with the fiery standoff at the nearby cabin.


The couple, Karen and Jim Reynolds, said at a news conference Wednesday that their ordeal lasted a few minutes but seemed like hours.


The Reynolds believe Dorner, 33, was holed up starting Friday in their unoccupied cabin in Big Bear, Calif., only steps from where police had set up a command center.


"He said four or five times that he didn't have a problem with us, he just wanted to clear his name," Jim Reynolds said. "He said, 'I don't have a problem with you, so I'm not going to hurt you.'"


Dorner tied their arms and put pillowcases over their heads before fleeing in their purple Nissan, the couple said.


Before he fled, the couple said Dorner told them that he had been watching them before he took over their cabin. Dorner told the couple he could tell they were "hard working, good people."


"He had been watching us and saw me shoveling the snow Friday," Jim Reynolds said.


They say they may have left the cabin door unlocked and that could have been the reason Dorner was able to enter undetected.


Dorner remained "calm and meticulous" throughout the harrowing ordeal, the couple said.


The Reynolds walked into their cabin around noon Tuesday when they came face-to-face with Dorner. There was no question in their minds who he was -- the suspected cop killer at the center of one of the largest manhunts in recent memory.






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Iran suggests progress, but no deal, in U.N. atom talks


DUBAI (Reuters) - Iran indicated that some progress was made in talks with the U.N. nuclear watchdog on Wednesday, but that the two sides again failed to finalize an elusive framework deal over the Islamic state's disputed atomic activity.


Iran's ambassador to the International Atomic Energy Agency (IAEA), Ali Asghar Soltanieh, said a new meeting would be held, without giving a date. There was no immediate comment from the IAEA about the one-day meeting in Tehran.


The IAEA had hoped to bridge persistent differences with Iran preventing the U.N. agency from restarting a long-stalled investigation into suspected nuclear weapons research by Tehran. Iran says the allegations are forged and baseless.


The apparent absence of a breakthrough deal in Wednesday's discussions in the Iranian capital will come as no surprise for Western diplomats, who have accused Iran of stonewalling the IAEA for years, a charge Tehran rejects.


World powers were watching the IAEA-Iran talks for signs that Tehran may finally be ready to start addressing their concerns over its nuclear program, which Tehran says is peaceful but the West fears is aimed at developing weapons.


Soltanieh said Iran and the IAEA had agreed on "some points" in the text of a planned framework agreement on how the IAEA should carry out its investigation, without giving details.


There was no immediate comment from the IAEA, which has been trying for more than a year to nail down such an accord giving it access to officials, documents and sites it says it needs for its inquiry in Iran.


"In addition to removing some differences and agreeing on some points in the text ... the two sides decided to review and exchange views about the new proposals that were given in this meeting, in the next meeting," Soltanieh said, according to Fars news agency.


AGREEMENT "NEAR" - STATE TV


Press TV, Iran's English-language state broadcaster, cited Soltanieh as saying that the remaining differences would be discussed in the next Iran-IAEA meeting. "Iran, IAEA near agreement on structured framework," it said in a headline.


The IAEA's immediate priority is to visit the Parchin military base southeast of Tehran, where it suspects explosives tests relevant to nuclear weapons may have taken place, perhaps a decade ago, an accusation Tehran denies.


The United States late last year set a March deadline for Iran to start cooperating in substance with the IAEA's investigation, warning Tehran that it might otherwise be referred to the U.N. Security Council.


Iran was first reported to the U.N. Security Council over its nuclear program by the IAEA's 35-nation board in 2006, and was then punished with U.N. sanctions.


The Islamic Republic denies Western allegations that its nuclear energy program is geared to developing the capability to produce atomic bombs. Iran says it is stockpiling enriched uranium only for civilian energy purposes.


On February 26, Iran and the six world powers are due, after a break of eight months to resume separate, broader negotiations in Kazakhstan aimed at finding a diplomatic settlement to the decade-old dispute and avert the threat of a new war in the Middle East.


The stakes are high: Israel, assumed to be the Middle East's only nuclear-armed power, has strongly hinted that it might take military action to prevent its foe acquiring weapons of mass destruction.


The six powers - the United States, Russia, China, France, Britain and Germany - want Iran to curb uranium enrichment and cooperate fully with the IAEA investigation.


Iran wants them to recognize what it sees as its right to refine uranium for peaceful purposes, and an easing of sanctions, which are hurting its oil-dependent economy.


(Additional reporting by Zahra Hosseinian in Zurich and Fredrik Dahl in Vienna; Editing by Michael Roddy)



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Papal 'cohabitation' poses unique Vatican challenge






VATICAN CITY: The Roman Catholic Church faces a unique challenge starting next month when a living former pope begins a "cohabitation" with his successor, both residing in the world's tiniest sovereign state, Vatican City.

The Vatican insists that the German pope, who stunned the world by announcing that he will retire on February 28, wants to keep a low profile in retirement.

"He will live at the Vatican in total discretion," Vatican spokesman Federico Lombardi said Wednesday. "His presence will in no way be an impediment, interference or a problem."

Nevertheless, Lombardi said the octogenarian's presence would be felt and "appreciated", and did not rule out an advisory role for the future pensioner, whose title has yet to be determined but may be Bishop of Rome Emeritus.

"If his successor wants advice from him he will be totally free to provide it... (but) this would in no way be required" of the former pope, Lombardi said.

Others in the Vatican are more nervous about the unprecedented situation.

Rino Fisichella, head of the Vatican department for the new evangelisation, said the former pope may eventually have to live elsewhere.

The Vatican on Wednesday denied an Internet rumour that the pope would take up permanent residence in the Abbey of Monte Cassino -- a famous monastery that was destroyed in World War II and rebuilt.

The cerebral former theology professor, who will turn 86 in April, is a prolific writer. He is currently completing a work on faith that started out as an encyclical but will have to be published as a book given Benedict's imminent abdication.

He is also expected to spend more time with his beloved cats and playing Beethoven and Mozart compositions on his piano.

An early signal of Benedict's intention to go quietly is his plan to leave the Vatican the day he steps aside, slipping away to the summer papal residence of Castel Gondolfo outside Rome.

The Vatican has been unable to say how long he will stay there, but has stressed he will not have any role in the Conclave of Cardinals that is to elect his successor in the third week of March -- in time for Easter at the end of the month.

His absence will allow workers to prepare the papal apartments in the Apostolic Palace for the new pontiff -- and complete renovations of the living quarters for the soon-to-be ex-pope in a former nunnery at the Vatican.

Benedict's choice not to return to his native Bavaria should surprise no one given that he has now lived in Rome for nearly four decades.

The little-known Mater Ecclesiae convent where he will reside was established by the pope's predecessor John Paul II to house cloistered nuns.

Their departure last November, two years earlier than expected, raised few eyebrows at the time but is now cited as one of a series of clues that presaged the pope's shock announcement, according to astute Vatican watchers.

The disused convent is an oasis of calm with its own gardens producing rare roses -- one of them named after John Paul II -- as well as vegetables and citrus fruit.

The peppers, tomatoes, courgettes and cabbages grown in the vegetable garden traditionally supply the papal kitchen.

Spread over three floors, the modern complex has 12 monastic cells upstairs, while the ground floor houses a kitchen, living room, library and chapel.

The cells are sparsely furnished: the only decorations to be seen are wooden crosses and a few paintings depicting scenes from religious life, according to the Vatican.

In retirement, Benedict is to revert to his birth name Joseph Ratzinger -- but canon law experts are looking into whether he can reclaim his status as a cardinal, or whether the new pope can make him a cardinal once again.

Asked if the pope would receive a pension, Lombardi hesitated but said the pope would not go hungry.

"We will ensure he can live a dignified existence," Lombardi said.

Some traditions usually observed at the death of a pope will be observed, notably the destruction of the Fisherman's Ring used to place the papal seal on official Church documents.

"It's an unprecedented situation, we'll see how it goes," Lombardi said.

-AFP/gn



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Hyderabad is the world’s second most affordable office market: Survey

BANGALORE: Hyderabad is the world's second most affordable office market after Surabaya in Indonesia, according to a survey, while Chennai and Pune are at fifth and sixth positions, reinforcing India's reputation as among the cheapest destinations for foreign firms to set up operations.

"Tier II cities in China and India continue to dominate the list of top-10 most affordable markets globally," said a survey by consultancy firm DTZ, which measured occupancy costs per workstation in 126 business districts across 49 countries in 2012.

"2012 has seen office space absorption rates across Indian cities drop by a fifth. We expect the office space absorption to be stable in the current year, driven by signs of overall improvement in global and domestic economies. Rentals are also expected to appreciate across the country," said Rohit Kumar, head of research at DTZ India.

According to the survey, it costs companies between $2,620 (about Rs 1.41 lakh) and $9,810 (Rs 5.27 lakh) per annum per employee in the top six Indian cities to set up operations, compared with $23,500 (Rs 12.63 lakh) per workstation in London West End.

China's Chongqing and Nanjing, followed by Cancun in Mexico, also figure among the ten most affordable markets. As per the report, a majority of markets in North Asia and India saw a 2-10 per cent rise in occupancy costs. This has forced occupiers in many markets to increasingly consider secondary space, particularly where prime space is limited to cut cost.

The total commercial office space absorption for the quarter ended December 2012 was 6.8 million sq ft, a decrease of 19 per cent compared with the previous year. Vacancies across cities are expected to rise in 2013, except Bangalore, a recent report by DTZ India said.

"Companies continue to consolidate and relocate to less premium locations. Many firms are now looking to cut real estate costs, which comprises 22-27 per cent of the total operational expenditure, the second biggest component after human resource," said Sridhar Raghavendra, founder of FM Zone India, a real estate and facility management firm.

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Clues to why most survived China melamine scandal


WASHINGTON (AP) — Scientists wondering why some children and not others survived one of China's worst food safety scandals have uncovered a suspect: germs that live in the gut.


In 2008, at least six babies died and 300,000 became sick after being fed infant formula that had been deliberately and illegally tainted with the industrial chemical melamine. There were some lingering puzzles: How did it cause kidney failure, and why wasn't everyone equally at risk?


A team of researchers from the U.S. and China re-examined those questions in a series of studies in rats. In findings released Wednesday, they reported that certain intestinal bacteria play a crucial role in how the body handles melamine.


The intestines of all mammals teem with different species of bacteria that perform different jobs. To see if one of those activities involves processing melamine, researchers from the University of North Carolina at Greensboro and Shanghai Jiao Tong University gave lab rats antibiotics to kill off some of the germs — and then fed them melamine.


The antibiotic-treated rats excreted twice as much of the melamine as rats that didn't get antibiotics, and they experienced fewer kidney stones and other damage.


A closer look identified why: A particular intestinal germ — named Klebsiella terrigena — was metabolizing melamine to create a more toxic byproduct, the team reported in the journal Science Translational Medicine.


Previous studies have estimated that fewer than 1 percent of healthy people harbor that bacteria species. A similar fraction of melamine-exposed children in China got sick, the researchers wrote. But proving that link would require studying stool samples preserved from affected children, they cautioned.


Still, the research is pretty strong, said microbiologist Jack Gilbert of the University of Chicago and Argonne National Laboratory, who wasn't involved in the new study.


More importantly, "this paper adds to a growing body of evidence which suggests that microbes in the body play a significant role in our response to toxicity and in our health in general," Gilbert said.


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Dorner Not IDed, But Manhunt Considered Over













Though they have not yet identified burned remains found at the scene of Tuesday's fiery, armed standoff, San Bernardino, Calif., officials consider the manhunt over for Christopher Dorner, the fugitive ex-cop accused of going on a killing spree.


"The events that occurred yesterday in the Big Bear area brought to close an extensive manhunt," San Bernardino County Sheriff John McMahon told reporters this evening.


"I cannot absolutely, positively confirm it was him," he added.


However, he noted the physical description of the suspect authorities pursued to a cabin at the standoff scene, as well as the suspect's behavior during the chase and standoff, matched Dorner, 33.


The charred remains of the body believed to be Dorner were removed from the cabin high in the San Bernardino Mountains near Big Bear, Calif., the apparent site of Dorner's last stand. Cornered inside the mountain cabin Tuesday, the suspect shot at cops, killing one deputy and wounding another, before the building was consumed by flames.


"We did not intentionally burn down that cabin to get Mr. Dorner out," McMahon said tonight, though he noted pyrotechnic canisters known as "burners" were fired into the cabin during a tear gas assault in an effort to flush out Dorner. The canisters generate high temperatures, he added.


The deputies wounded in the firefight were airlifted to a nearby hospital, where one died, police said.








Christopher Dorner Believed Dead After Shootout with Police Watch Video









Carjacking Victim Says Christopher Dorner Was Dressed for Damage Watch Video









Christopher Dorner Manhunt: Inside the Shootout Watch Video





The deceased deputy was identified tonight as Det. Jeremiah MacKay, 35, a 15-year veteran and the father of two children -- a daughter, 7, and son, 4 months old.


"Our department is grieving from this event," McMahon said. "It is a terrible deal for all of us."


The Associated Press quoted MacKay on the Dorner dragnet Tuesday, noting that he had been on patrol since 5 a.m. Saturday.


"This one you just never know if the guy's going to pop out, or where he's going to pop out," MacKay said. "We're hoping this comes to a close without more casualties. The best thing would be for him to give up."


The wounded deputy, identified as Alex Collins, was undergoing multiple surgeries for his wounds at a hospital, McMahon said, but was expected to make a full recovery.


Before the final standoff, Dorner was apparently holed up in a snow-covered cabin in the California mountains just steps from where police had set up a command post and held press conferences during a five-day manhunt.


The manhunt for Dorner, one of the biggest in recent memory, led police to follow clues across the West and into Mexico, but it ended just miles from where Dorner's trail went cold last week.


Residents of the area were relieved today that after a week of heightened police presence and fear that Dorner was likely dead.


"I'm glad no one else can get hurt and they caught him. I'm happy they caught the bad guy," said Ashley King, a waitress in the nearby town of Angelus Oaks, Calif.


Hundreds of cops scoured the mountains near Big Bear, a resort area in Southern California, since last Thursday using bloodhounds and thermal-imaging technology mounted to helicopters, in the search for Dorner. The former police officer and Navy marksman was suspected to be the person who killed a cop and cop's daughter and issued a "manifesto" declaring he was bent on revenge and pledging to kill dozens of LAPD cops and their family members.


But it now appears that Dorner never left the area, and may have hid out in an unoccupied cabin just steps from where cops had set up a command center.






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North Korean nuclear test draws anger, including from China


SEOUL (Reuters) - North Korea conducted its third nuclear test on Tuesday in defiance of U.N. resolutions, drawing condemnation from around the world, including from its only major ally, China, which summoned the North Korean ambassador to protest.


Pyongyang said the test was an act of self-defense against "U.S. hostility" and threatened stronger steps if necessary.


The test puts pressure on U.S. President Barack Obama on the day of his State of the Union speech and also puts China in a tight spot, since it comes in defiance of Beijing's admonishments to North Korea to avoid escalating tensions.


The U.N. Security Council held an emergency meeting at which its members, including China, "strongly condemned" the test and vowed to start work on appropriate measures in response, the president of the council said.


North Korean leader Kim Jong-un, the third of his line to rule the country, has presided over two long-range rocket launches and a nuclear test during his first year in power, pursuing policies that have propelled his impoverished and malnourished country closer to becoming a nuclear weapons power.


North Korea said the test had "greater explosive force" than those it conducted in 2006 and 2009. Its KCNA news agency said it had used a "miniaturized" and lighter nuclear device, indicating it had again used plutonium, which is suitable for use as a missile warhead.


China, which has shown signs of increasing exasperation with the recent bellicose tone of its reclusive neighbor, summoned the North Korean ambassador in Beijing and protested sternly, the Foreign Ministry said.


Foreign Minister Yang Jiechi said China was "strongly dissatisfied and resolutely opposed" to the test and urged North Korea to "stop any rhetoric or acts that could worsen situations and return to the right course of dialogue and consultation as soon as possible".


Analysts said the test was a major embarrassment to China, which is a permanent member of the Security Council and North Korea's sole major economic and diplomatic ally.


Obama called the test a "highly provocative act" that hurt regional stability.


"The danger posed by North Korea's threatening activities warrants further swift and credible action by the international community. The United States will also continue to take steps necessary to defend ourselves and our allies," Obama said.


U.S. Ambassador to the United Nations Susan Rice said Washington and its allies intended to "augment the sanctions regime" already in place due to Pyongyang's previous atomic tests. North Korea is already one of the most heavily sanctioned states in the world and has few external economic links that can be targeted.


Japanese Prime Minister Shinzo Abe said the test was a "grave threat" that could not be tolerated.


Russian Foreign Minister Sergei Lavrov urged North Korea to abandon its nuclear arms program and return to talks. NATO condemned the test as an "irresponsible act."


South Korea, still technically at war with North Korea after a 1950-53 civil war ended in a mere truce, also denounced the test. Obama spoke to South Korean President Lee Myung-bak on Tuesday and told him the United States "remains steadfast in its defense commitments" to Korea, the White House said.


MAXIMUM RESTRAINT


North Korea's Foreign Ministry said the test was "only the first response we took with maximum restraint".


"If the United States continues to come out with hostility and complicates the situation, we will be forced to take stronger, second and third responses in consecutive steps," it said in a statement carried by the official KCNA news agency.


North Korea - which gave the U.S. State Department advance warning of the test - often threatens the United States and its "puppet", South Korea, with destruction in colorful terms.


North Korea told the U.N. disarmament forum in Geneva that it would never bow to resolutions on its nuclear program and that prospects were "gloomy" for the denuclearization of the divided Korean peninsula because of a "hostile" U.S. policy.


Suzanne DiMaggio, an analyst at the Asia Society in New York, said North Korea had embarrassed China with the test. "China's inability to dissuade North Korea from carrying through with this third nuclear test reveals Beijing's limited influence over Pyongyang's actions in unusually stark terms," she said.


Mark Fitzpatrick of the International Institute for Strategic Studies think tank, said: "The test is hugely insulting to China, which now can be expected to follow through with threats to impose sanctions."


The magnitude of the explosion was roughly twice that of the 2009 test, according to the Vienna-based Comprehensive Nuclear-Test Ban Treaty Organization. The U.S. Geological Survey said that a seismic event measuring 5.1 magnitude had occurred.


U.S. intelligence agencies were analyzing the event and found that North Korea probably conducted an underground nuclear explosion with a yield of "approximately several kilotons", the Office of the Director of National Intelligence said.


Nuclear experts have described Pyongyang's previous two tests as puny by international standards. The yield of the 2006 test has been estimated at less than 1 kiloton (1,000 tons of TNT equivalent) and the second at some 2-7 kilotons, compared with 20 kilotons for a Nagasaki-type bomb.


Initial indications are that the test involved the latest version of a plutonium-based prototype weapon, according to one current and one former U.S. national security official. Both previous tests involved plutonium. If it turns out the test was of a new uranium-based weapon, it would show that North Korea has made more progress on uranium enrichment than previously thought.


The United States uses WC-135 Constant Phoenix "sniffer" aircraft to collect samples to identify nuclear explosions. These would need to be deployed quickly to detect whether highly enriched uranium rather than plutonium was used because uranium decays to undetectable levels within a matter of days. Plutonium takes much longer to decay.


North Korea trumpeted news of the test on its state television channel to patriotic music against a backdrop of its national flag.


"It was confirmed that the nuclear test that was carried out at a high level in a safe and perfect manner using a miniaturized and lighter nuclear device with greater explosive force than previously did not pose any negative impact on the surrounding ecological environment," KCNA said.


North Korea linked the test to its technical prowess in launching a long-range rocket in December, a move that triggered the U.N. sanctions, backed by China, that Pyongyang said prompted it to take Tuesday's action.


The North's ultimate aim, Washington believes, is to design an intercontinental ballistic missile capable of carrying a nuclear warhead that could hit the United States. North Korea says the program is aimed at putting satellites in space.


Despite its three nuclear tests and long-range rocket tests, North Korea is not believed to be close to manufacturing a nuclear missile capable of hitting the United States.


It used plutonium in previous nuclear tests and before Tuesday there had been speculation that it would use highly enriched uranium so as to conserve its plutonium stocks, as testing eats into its limited supply of materials to construct a nuclear bomb.


"VICIOUS CYCLE"


When Kim Jong-un, who is 30, took power after his father's death in December 2011, there were hopes that he would bring reforms and end Kim Jong-il's "military first" policies.


Instead, North Korea, whose economy is smaller than it was 20 years ago and where a third of children are believed to be malnourished, appears to be trapped in a cycle of sanctions followed by further provocations.


"The more North Korea shoots missiles, launches satellites or conducts nuclear tests, the more the U.N. Security Council will impose new and more severe sanctions," said Shen Dingli, a professor at Shanghai's Fudan University. "It is an endless, vicious cycle."


Options for the international community appear to be in short supply. Diplomats at the United Nations said negotiations on new sanctions could take weeks since China is likely to resist tough new measures for fear they could lead to further retaliation by the North Korean leadership.


Beijing has also been concerned that tougher sanctions could further weaken North Korea's economy and prompt a flood of refugees into China.


Tuesday's action appeared to have been timed for the run-up to February 16 anniversary celebrations of Kim Jong-il's birthday, as well as to achieve maximum international attention.


Significantly, the test comes at a time of political transition in China, Japan and South Korea, and as Obama begins his second term. The U.S. president will likely have to tweak his State of the Union address due to be given on Tuesday.


Japanese Prime Minister Shinzo Abe is bedding down a new government and South Korea's new president, Park Geun-hye, is preparing to take office on February 25.


China too is in the midst of a once-in-a-decade leadership transition to Xi Jinping, who takes office in March. Both Abe and Xi are staunch nationalists.


The longer-term game plan from Pyongyang may be to restart international talks aimed at winning food and financial aid. China urged it to return to the stalled "six-party" talks on its nuclear program, hosted by China and including the two Koreas, the United States, Japan and Russia.


Its puny economy and small diplomatic reach mean that North Korea struggles to win attention on the global stage - other than through nuclear tests and attacks on South Korea, the last of which was made in 2010.


"Now the next step for North Korea will be to offer talks... - any form to start up discussion again to bring things to their advantage," predicted Jeung Young-tae, senior research fellow at the Korea Institute for National Unification in Seoul.


(Additional reporting by Jack Kim, Christine Kim and Jumin Park in SEOUL; Linda Sieg in TOKYO; Louis Charbonneau and Michelle Nichols at the UNITED NATIONS; Fredrik Dahl in VIENNA; Michael Martina and Chen Aizhu in BEIJING; Mette Fraende in COPENHAGEN; Adrian Croft, Charlie Dunmore and Justyna Pawlak in BRUSSELS; Mark Hosenball, Paul Eckert, Roberta Rampton, Tabassum Zakaria and Jeff Mason in WASHINGTON; Editing by Nick Macfie, Claudia Parsons and David Brunnstrom)



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