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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Iceland works to block Internet porn

If Iceland's Interior minister gets enough support, his country could be the first in the West to ban all Internet pornography. Ogmundur Jonasson is working on new legal measures that could make access to online porn nearly impossible, according to the Daily Mail.

"We have to be able to discuss a ban on violent pornography, which we all agree has a very harmful effects on young people and can have a clear link to incidences of violent crime," Jonasson told the Daily Mail. He added that the move isn't about censorship but rather the safety of women who appear in porn and children who may be exposed to it.

Jonasson's proposals include blocking porn IP addresses and making it illegal to use Iceland-based credit cards on X-rated Web sites.

Iceland has long held an adversarial stance against pornography. According to the Daily Mail, the country has already made it illegal to print and distribute porn. Now, Jonasson seems to want to bring Iceland's laws up to the Internet age.

The country's move to prohibit all porn stems from a 2010 government study. The study found that the violent nature of pornographic photos and videos, which are widely available on the Internet, have increased the rate of sexual abuse and rape in the country. It also concluded that children who were exposed to violent pornography showed signs of trauma.

Several other countries have tried to block online porn. In July, Indonesia shut down 1 million porn sites, and in November, Egypt also attempted to censor online pornography by blocking Web sites.

Like Iceland, the U.K. has also worked to keep Internet porn away from children. Last year, the government suggested putting rules on how X-rated sites are accessed. These rules included content filters where ISP customers would receive, by default, a filtered version of the Internet. Customers who did not want restricted Internet access would have to "opt in" to get the Internet uncensored.

Iceland's plan to totally block Internet porn seems to take the U.K.'s idea one step further.

"There is a strong consensus building in Iceland. We have so many experts from educationalists to the police and those who work with children behind this, that this has become much broader than party politics," Jonasson's political adviser Halla Gunnarsdottir told the Daily Mail. "At the moment, we are looking at the best technical ways to achieve this. But surely if we can send a man to the moon, we must be able to tackle porn on the Internet."

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Why We Walk … and Run … And Walk Again to Get Where We're Going

You have to get to a bus stop to catch the once-an-hour express ... or to a restaurant to meet a friend ... or to a doctor's office. You've got maybe a half a mile to cover and you're worried you'll be late. You run, then you stop and walk, then run some more.

But wait. Wouldn't it be better to run the whole way?

Not necessarily.

A new study by an assistant professor of mechanical engineering at Ohio State University tests the theory that people subconsciously mix walking and running so they get where they need to. The idea is that "people move in a manner that minimizes energy consumption," said the professor, Manoj Srinivasan.

Srinivasan asked 36 subjects to cover 400 feet (122 meters), a bit more than the length of a football field. He gave them a time to arrive at the finish line and a stopwatch. If the deadline was supertight, they ran. If they had two minutes, they walked. And if the deadline was neither too short nor too far off, they toggled between walking and running.

The takeaway: Humans successfully make the walk-run adjustment as they go along, based on their sense of how far they have to go. "It's not like they decide beforehand," Srinivasan said. (Get tips, gear recommendations, and more in our Running Guide.)

The Best Technique for "the Twilight Zone"

"The mixture of walking and running is good when you have an intermediate amount of time," he explained. "I like to call it 'the Twilight Zone,' where you have neither infinite time nor do you have to be there now."

That ability to shift modes served ancient humans well. "It's basically an evolutionary argument," Srinivasan said. A prehistoric human seeking food would want to move in a way that conserves some energy so that if food is hard to find, the hunter won't run out of gas—and will still be able to rev it up to escape predators.

The study, published on January 30 in the Journal of the Royal Society Interface, doesn't answer that question of how we make such adjustments.

Runners: Take a Break if You Need It

The mix of walking and running is also something that nonelite marathoners are familiar with. Covering 26.2 miles might take less of a toll if the runner stops running from time to time, walks a bit, then resumes a jogging pace. "You use less energy overall and also give yourself a bit of a break," Srinivasan noted. (Watch: An elite marathoner on her passion for running.)

One take-home lesson is: Runners, don't push it all the time. A walk-run mix will minimize the energy you expend.

Lesson two: If you're a parent walking with your kid, and the kid lags behind, then runs to catch up, then lags again, the child isn't necessarily trying to annoy you. Rather, the child is perhaps exhibiting an innate ability to do the walk-run transition.

Potential lesson three: The knowledge that humans naturally move in a manner that minimizes energy consumption might be helpful in designing artificial limbs that feel more natural and will help the user reduce energy consumption.

The big question for Manoj Srinivasan: Now that he has his walk-run theory, does he consciously switch between running and walking when he's trying to get somewhere? "I must admit, no," he said. "When I want to get somewhere, I just let the body do its thing." But if he's in a rush, he'll make a mad dash.

"Talk to you tomorrow," he signed off in an email to National Geographic News. "Running to get to teaching now!"

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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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Water wars loom as the US runs dry

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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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Hackers can easily breach Emergency Alert Systems

Hackers broke into several television stations' Emergency Alert Systems this week and broadcast that zombies were "rising from their graves" and "attacking the living."

While a comical hoax, security consultancy firm IOActive warns that this type of behavior is dangerous and not that hard for hackers to do, according to Computerworld. This week it's zombies, but next time it could be something that might make people really panic, such as an anthrax or terrorist attack.

IOActive says that devices used by TV and radio stations to air emergency alerts have critical vulnerabilities that make them susceptible to cyberattacks. If these devices are breached, hackers could feasibly broadcast anything they like to millions of viewers and listeners.

"We found some devices directly connected to the Internet and we think that it's possible that hackers are currently exploiting some of these vulnerabilities or some other flaws," chief technology officer of IOActive Cesar Cerrudo told Computerworld.

Cerrudo says that at least two types of Emergency Alert System devices are especially vulnerable to attacks. "We contacted CERT [U.S. Computer Emergency Readiness Team] almost a month ago and CERT is coordinating with the vendor to get the issues fixed," he said.

The hacker that got into the television stations' systems for the zombie hoax reportedly used a "back door" attack.

"It has been determined that a 'back door' attack allowed the hacker to access the security of the EAS equipment," station manager for ABC 10, one of the stations affected, Cynthia Thompson wrote in a blog post. "The nature of the message Monday night was not necessarily dangerous, but the fact that the system was vulnerable to outside intrusion is a danger."

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Are Honeybees Losing Their Way?

A single honeybee visits hundreds, sometimes thousands, of flowers a day in search of nectar and pollen. Then it must find its way back to the hive, navigating distances up to five miles (eight kilometers), and perform a "waggle dance" to tell the other bees where the flowers are.

A new study shows that long-term exposure to a combination of certain pesticides might impair the bee's ability to carry out its pollen mission.

"Any impairment in their ability to do this could have a strong effect on their survival," said Geraldine Wright, a neuroscientist at Newcastle University in England and co-author of a new study posted online February 7, 2013, in the Journal of Experimental Biology.

Wright's study adds to the growing body of research that shows that the honeybee's ability to thrive is being threatened. Scientists are still researching how pesticides may be contributing to colony collapse disorder (CCD), a rapid die-off seen in millions of honeybees throughout the world since 2006.

"Pesticides are very likely to be involved in CCD and also in the loss of other types of pollinators," Wright said. (See the diversity of pollinating creatures in a photo gallery from National Geographic magazine.)

Bees depend on what's called "scent memory" to find flowers teeming with nectar and pollen. Their ability to rapidly learn, remember, and communicate with each other has made them highly efficient foragers, using the waggle dance to educate others about the site of the food source.

Watch as National Geographic explains the waggle dance.

Their pollination of plants is responsible for the existence of nearly a third of the food we eat and has a similar impact on wildlife food supplies.

Previous studies have shown certain types of pesticides affect a bee's learning and memory. Wright's team wanted to investigate if the combination of different pesticides had an even greater effect on the learning and memory of honeybees.

"Honeybees learn to associate floral colors and scents with the quality of food rewards," Wright explained. "The pesticides affect the neurons involved in these behaviors. These [affected] bees are likely to have difficulty communicating with other members of the colony."

The experiment used a classic procedure with a daunting name: olfactory conditioning of the proboscis extension reflex. In layman's terms, the bee sticks out its tongue in response to odor and food rewards.

For the experiment, bees were collected from the colony entrance, placed in glass vials, and then transferred into plastic sandwich boxes. For three days the bees were fed a sucrose solution laced with sublethal doses of pesticides. The team measured short-term and long-term memory at 10-minute and 24-hour intervals respectively. (Watch of a video of a similar type of bee experiment.)

This study is the first to show that when pesticides are combined, the impact on bees is far worse than exposure to just one pesticide. "This is particularly important because one of the pesticides we used, coumaphos, is a 'medicine' used to treat Varroa mites [pests that have been implicated in CCD] in honeybee colonies throughout the world," Wright said.

The pesticide, in addition to killing the mites, might also be making honeybees more vulnerable to poisoning and effects from other pesticides.

Stephen Buchmann of the Pollinator Partnership, who was not part of Wright's study, underscored how critical pollinators are for the world. "The main threat to pollinators is habitat destruction and alteration. We're rapidly losing pollinator habitats, natural areas, and food—producing agricultural lands that are essential for our survival and well being. Along with habitat destruction, insecticides weaken pollinators and other beneficial insects."

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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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Plants listen more closely to kin than strangers

It is not just humans that like a natter with their nearest and dearest – plants pay most attention to their closest relatives.

When an insect bites a leaf, many plants release volatile chemicals to prime their neighbours for attack. The defences this triggers vary – some plants respond by attracting predatory insects that eat the herbivores, others make themselves less tasty.

Now Richard Karban of the University of California, Davis, has shown that for the sagebrush, responses to these warning signals can vary with relatedness.

At the start of three growing seasons, Karban's team exposed different branches of the same plants to volatile chemicals. The substances came from relatives of the same species whose leaves had been clipped to trigger chemical release.

By the end of the seasons, herbivores had done less damage to the branches exposed to chemicals from close relatives than to those receiving signals from more distant relatives – the warning probably prompting the plants to release herbivore-deterring chemicals, says Karban.

He has previously shown that the blend of volatiles varies enormously between individuals – "so much so that big peaks in some individuals are undetectable in others", he says.

However, there is some similarity between family members. Karban thinks this variability is being exploited by the plants as a kind of family-specific signature, to prevent eavesdroppers from listening in and to give those that share the same genes a greater chance of survival.

Some plants are genetically more resistant to being eaten than others, so it makes sense that plants should care more about their kin's fate than that of the general population.

"It is very elegant work," says Susan Dudley from McMaster University in Ontario, Canada, who has shown that plants competing for space in a small pot are less aggressive if they are related to their neighbours.

She thinks this kind of kin-recognition is probably common among many plants.

Journal Reference: Proceedings of the Royal Society B, doi: 10.1098/rspb.2012.3062

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