Friday, December 14, 2012

North Korea still years away from reliable missiles

SEOUL, South Korea (AP) ? After 14 years of painstaking labor, North Korea finally has a rocket that can put a satellite in orbit. But that doesn't mean Pyongyang is close to having an intercontinental ballistic missile.

Experts say North Korea is years from even having a shot at developing reliable missiles that could bombard the American mainland and other distant targets, though it did gain attention and the outrage of world leaders Wednesday with its first successful launch of a three-stage, long-range rocket.

A missile program is built on decades of systematic, intricate testing, something extremely difficult for economically struggling Pyongyang, which faces guaranteed sanctions and world disapproval each time it stages an expensive launch. North Korea will need larger and more dependable missiles, and more advanced nuclear weapons, to threaten U.S. shores, though it already poses a threat to its neighbors.

"One success indicates progress, but not victory, and there is a huge gap between being able to make a system work once and having a system that is reliable enough to be militarily useful," said Brian Weeden, a former U.S. Air Force Space Command officer and a technical adviser to the Secure World Foundation, a think tank on space policy.

North Korea's satellite launch came only after repeated failures and hundreds of millions of dollars. It is an achievement for young authoritarian leader Kim Jong Un, whose late father and predecessor, Kim Jong Il, made development of missiles and nuclear weapons a priority despite international opposition and his nation's poverty.

Kim said the achievement "further consolidated" the country's status "as a space power," the government's official Korean Central News Agency reported Thursday. It added that Kim personally issued a written launch order and "stressed the need to continue to launch satellites in the future."

South Korea's Defense Ministry said Thursday the satellite was orbiting normally at a speed of 7.6 kilometers (4.7 miles) per second, though it's not known what mission it is performing. North Korean space officials say the satellite would be used to study crops and weather patterns.

Though Pyongyang insists the project is peaceful, it also has conducted two nuclear tests and has defied international demands that it give up its nuclear weapons program.

A senior U.S. official said the satellite is tumbling in orbit and not acting as it should, but the official said that doesn't necessarily mean it is out of control. The official, who spoke on the condition of anonymity because of a lack of authorization to publicly discuss the U.S. analysis, said the important takeaway is that North Korea was able to successfully execute all three stages of the missile launch and get the satellite into space.

The U.N. Security Council said the launch violates council resolutions against the North's use of ballistic missile technology, and said it would urgently consider "an appropriate response."

"This launch is about a weapons program, not peaceful use of space," U.S. State Department spokeswoman Victoria Nuland said. Even the North's most important ally, China, expressed regret.

North Korea has long possessed the components needed to construct long-range rockets. Scientists in Pyongyang, however, had been trying and failing since 1998 to conduct a successful launch. Only this week ? their fifth try ? did they do so, prompting dancing in the streets of the capital.

North Korea's far more advanced rival, South Korea, has failed twice since 2009 to launch a satellite on a rocket from its own territory, and postponed two attempts in recent weeks because of technical problems.

Each advancement Pyongyang makes causes worry in Washington and among North Korea's neighbors. In 2010, U.S. Secretary of Defense Robert Gates warned that within five years the North could develop an intercontinental ballistic missile capable of reaching the United States.

But experts say the North must still surmount tough technical barriers to build the ultimate military threat: a sophisticated nuclear warhead small enough to mount on a long-range missile, something experts say will be the focus of future nuclear tests.

And despite Wednesday's launch, Pyongyang is also lacking the other key part of that equation: a reliable long-range missile.

"If in the future they develop a nuclear warhead small enough to put on a rocket, they are not going to want to put that on a missile that has a high probability of exploding on the launch pad," David Wright, a physicist with the Union of Concerned Scientists who has written extensively about North Korea's missile program, said in an email.

To create a credible missile program, experts say, North Korean technicians need to conduct many more tests that will allow them to iron out the wrinkles until they have a missile that works more often than it fails. Pyongyang's past tests have been somewhat scattershot, possibly because of the heavy international sanctions the rocket and nuclear tests have generated.

North Korea must build a larger missile than the one launched Wednesday if it wants to be able to send nuclear weapons to distant targets, analysts said.

The satellite North Korea mounted on the rocket weighs only 100 kilograms (220 pounds), according to the office of South Korean lawmaker Jung Chung-rae, who was briefed by a senior South Korean intelligence official. A nuclear warhead would be about five times heavier.

Other missing parts of the puzzle include an accurate long-range missile guidance system and a re-entry vehicle able to survive coming back into the atmosphere at the high speeds ? 10,000 mph ? traveled by intercontinental ballistic missiles, said Jonathan McDowell of the Harvard-Smithsonian Center for Astrophysics in Massachusetts.

Both are seen as being years off.

History also shows that first-generation, long-range missiles need dozens of test flights before they are accurate enough to be deployed.

The world's "ICBM club" has just four countries: the United States, Russia, China and France, according to Markus Schiller, an analyst with Schmucker Technologie in Germany and a leading expert on North Korean missiles.

If North Korea "really intended to become a player in the ICBM game, they would have to develop a different kind of missile, with higher performance," Schiller said. "And if they do that seriously, we would have to see flight tests every other month, over several years."

Wright said the Unha-3 rocket launched Wednesday has a potential range of 8,000 to 10,000 kilometers (4,970 to 6,210 miles), which could put Hawaii and the northwest coast of the mainland United States within range.

But even if North Korea builds a ballistic missile based on a liquid-fueled rocket like the 32-meter (105-foot)-tall Unha-3, it would take days to assemble and hours to fuel. That would make it vulnerable to attack in a pre-emptive airstrike. Solid-fueled missiles developed by the U.S. and Soviet Union are more mobile, more easily concealed and ready to launch within minutes.

Money is another problem for Pyongyang. A weak economy, chronic food shortages and the sanctions make it difficult to sustain a program that can build and operate reliable missiles.

"I don't think the young leader has any confidence that the home economy could afford a credible deterrent capability," said Zhu Feng, deputy director of the Center for International and Strategic Studies at Peking University.

Weeden said North Korea may want to create the perception that it poses a threat to the United States, but "I don't think that perception will be matched by the actual hard work and testing needed to develop and field a reliable, effective weapon system like the ICBMs deployed by the US, Russia and China."

North Korea already poses a major security threat to its East Asian neighbors. It has one of the world's largest standing armies and a formidable if aging arsenal of artillery that could target Seoul, the capital of South Korea. Nearly 30,000 U.S. forces are based in South Korea, a legacy of the 1950-53 Korean War that ended with an armistice, not a formal peace treaty.

The North's short-range rockets could also potentially target another core U.S. ally, Japan.

Daryl Kimball, executive director of the nongovernmental Arms Control Association, said those capabilities, rather than the North's future ability to strike the U.S., still warrant the most attention.

___

Pennington reported from Washington. Associated Press writers Liz Sidoti in Washington, Alexa Olesen in Beijing and Jenni Sohn in New York contributed to this report.

Source: http://news.yahoo.com/nkorea-still-years-away-reliable-missiles-165539108.html

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Wednesday, December 12, 2012

Jenna Bush Hager announces pregnancy

Jenna Bush Hager, daughter of former President George W. Bush, announced Wednesday that she and husband Henry Hager are expecting their first child next spring.

"I'm nervous and so excited to say that Henry and I are pregnant?or I'm pregnant," Hager, a correspondent for NBC's "Today Show" announced on the program. "We're so excited. And I'm, you know, obviously nervous about it. I'm a first-time mom?but it's something I've always wanted."

Former President Bush and former first lady Laura Bush called into the show to share their joy.

"I'm fired up! Looking forward to it. And I'm excited for Jenna and Henry," the former president said of his future first grandchild. "I said I can barely contain the news when I found out, so now I can tell all my buddies."

Source: http://news.yahoo.com/blogs/ticket/jenna-bush-hager-announces-pregnancy-134643320--politics.html

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Tuesday, December 11, 2012

Fitness, From Health To Strength, A General Knowledge Guide ...

Increasing your fitness and health is a fantastic goal. True, it can seem daunting in the beginning, especially if you are new to fitness. The article below has ideas and advice that can help. You?ll feel great and enjoy improved health.

The best method of getting fit is daily exercise. Daily exercise keeps you focused so you never let a day go to waste in regard to your physical health. This will allow exercising to become more of a habit as well. Be sure that you?re saving a few days a week for exercise that is more light so you?re not overloading your body.

There are few exercises as great as kickboxing. There is not a single person that can attempt kickboxing and say it was not a great workout. You will burn a lot of calories during this workout, and you will also gain a lot of strength.

How much do you know about whole grains? However, there are many whole grains that can be eaten any time of the day, such as quinoa, barley or brown rice. Adding these to many dishes, such as stir-frys or soups, is a strong possibility. Eating your whole grains is easier than you thought.

Avoid over exercising when you become sick. If you are ill, your body has to use its energy to heal itself. The body is unable to create muscle and increase endurance throughout this period. This means that you should stop exercising until you feel better. Until then, follow your doctor?s directions, eat nutritious foods and get adequate rest.

If you want to look and feel great, consider making fitness a major goal in your life. If regular exercise has not been part of your past, starting it can seem intimidating. However, you can do it with the proper assistance. The tips here will increase your level of fitness and help you achieve all of your goals.

Source: http://stumblepeach.com/fitness-from-health-to-strength-a-general-knowledge-guide/

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Monday, December 10, 2012

Santa Claus Parade this Saturday

December 7, 2012 at 7pm, Historic Downtown Coopersville

Grand Marshall - Ruth Brifling

One of the original night-time parades in Michigan, this annual event begins immediately following the lighting of Lori's Tree at the corner of Eastmanville & Main Streets.

Professional and amateur floats, decorated vehicles and firetrucks compete for prizes as they travel along Main Street in the Historic Downtown District of Coopersville.

Guests are invited to a free ride on the Coopersville & Marne Railway Shuttle from East Street adjacent to the school campus to the downtown area.? After their return ride they are invited to have free refreshments while the children have a visit with Santa, get their faces painted and more.

Visit http://www.coopersville.com for additional information.

Source: http://coopersville.wzzm13.com/news/community-spirit/75491-santa-claus-parade-saturday

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Egypt's Oppositions Calls for Protests Against Referendum (Voice Of America)

Share With Friends: Share on FacebookTweet ThisPost to Google-BuzzSend on GmailPost to Linked-InSubscribe to This Feed | Rss To Twitter | Politics - Top Stories News, News Feeds and News via Feedzilla.

Source: http://news.feedzilla.com/en_us/stories/politics/top-stories/269489565?client_source=feed&format=rss

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Friday, December 7, 2012

Seeing in color at the nanoscale: Scientists develop a new nanotech tool to probe solar-energy conversion

ScienceDaily (Dec. 6, 2012) ? If nanoscience were television, we'd be in the 1950s. Although scientists can make and manipulate nanoscale objects with increasingly awesome control, they are limited to black-and-white imagery for examining those objects. Information about nanoscale chemistry and interactions with light -- the atomic-microscopy equivalent to color -- is tantalizingly out of reach to all but the most persistent researchers.

But that may all change with the introduction of a new microscopy tool from researchers at the Department of Energy (DOE)'s Lawrence Berkeley National Laboratory (Berkeley Lab) that delivers exquisite chemical details with a resolution once thought impossible. The team developed their tool to investigate solar-to-electric energy conversion at its most fundamental level, but their invention promises to reveal new worlds of data to researchers in all walks of nanoscience.

"We've found a way to combine the advantages of scan/probe microscopy with the advantages of optical spectroscopy," says Alex Weber-Bargioni, a scientist at the Molecular Foundry, a DOE nanoscience center at Berkeley Lab. "Now we have a means to actually look at chemical and optical processes on the nanoscale where they are happening."

Weber-Bargioni is corresponding author of a paper reporting this research, published in Science. The paper is titled, "Mapping local charge recombination heterogeneity by multidimensional nanospectroscopic imaging." Co-authoring the paper are Wei Bao, Mauro Meli, Frank Ogletree, Shaul Aloni, Jeffrey Bokor, Stephano Cabrini, Miquel Salmeron, Eli Yablonovitch, and James Schuck of Berkeley Lab; Marco Staffaroni of the University of California, Berkeley; Hyuck Choo of Caltech; and their colleagues in Italy, Niccolo Caselli, Francesco Riboli, Diederik Wiersma, and Francesca Intoni.

"If you want to characterize materials, particularly nanomaterials, the way it's traditionally been done is with electron microscopies and scan/probe microscopies because those give you really high, sub-atomic spatial resolution," says co-author James Schuck, a nano-optics researcher at the Molecular Foundry. "Unfortunately, what they don't give you is chemical, molecular-level information."

For chemical information, researchers typically turn to optical or vibrational spectroscopy. The way a material interacts with light is dictated to large part by its chemical composition, but for nanoscience the problem with doing optical spectroscopy at relevant scales is the diffraction limit, which says you can't focus light down to a spot smaller than approximately half its wavelength, due to the wave-nature of light.

To get around the diffraction limit, scientists employ "near-field" light. Unlike the light we can see, near-field light decays exponentially away from an object, making it hard to measure, but it contains very high resolution -- much higher than normal, far-field light.

Says Schuck, "The real challenge to near-field optics, and one of the big achievements in this paper, is to create a device that acts as a transducer of far-field light to near-field light. We can squeeze it down and get very enhanced local fields that can interact with matter. We can then collect any photons that are scattered or emitted due to this interaction, collect in the near field with all this spatial frequency information and turn it back into propagating, far-field light."

The trick for that conversion is to use surface plasmons: collective oscillations of electrons that can interact with photons. Plasmons on two surfaces separated by a small gap can collect and amplify the optical field in the gap, making a stronger signal for scientists to measure.

Researchers have exploited these effects to make near-field probes with a variety of geometries, but the experiments typically require painstaking optical alignment, suffer from background noise, only work for narrow frequency ranges of light and are limited to very thin samples.

In this latest work, however, the Berkeley Lab researchers transcended these limitations with a cleverly designed near-field probe. Fabricated on the end of an optical fiber, the probe has a tapered, four-sided tip. The researchers named their new tool after the campanile church tower it resembles, inspired by the landmark clock tower on the UC Berkeley campus. Two of the campanile's sides are coated with gold and the two gold layers are separated by just a few nanometers at the tip. The three-dimensional taper enables the device to channel light of all wavelengths down into an enhanced field at the tip. The size of the gap determines the resolution.

In a regular atomic force microscope (AFM), a sharp metal tip is essentially dragged across a sample to generate a topological map with sub-nanoscale resolution. The results can be exquisite but only contain spatial information and nothing about the composition or chemistry of the sample.

Replacing the usual AFM tip with a campanile tip is like going from black-and-white to full color. You can still get the spatial map but now there's a wealth of optical data for every pixel on that map. From optical spectra, scientists can identify atom and molecule species, and extract details about electronic structure.

"That's the beauty of these tips," says Schuck. "You can just put them on the end of an optical fiber and then it's just like using a regular AFM. You don't have to be a super near-field jock anymore to get this type of data."

The team developed their new tool to study indium-phosphide nanowires. These nanowires, with the nearly ideal band gap of 1.4 electron-volts, are well-suited to converting solar energy to electricity. The researchers found that the nanowires were not the homogeneous objects previously thought, but instead had varying optoelectronic properties along their length, which could radically alter how sunlight is converted to electricity. They also found that photoluminescence, an indication of the relationship between light and electricity, was seven-times stronger in some parts of a nanowire than others. This is the first time anyone has measured these events on such a small scale.

Weber-Bargioni says: "Details like this about indium-phosphide nanowires are important because if you want to use these suckers for photocatalysis or a photovoltaic material then the length scale at which we're measuring is where everything happens. This information is really important to understand how, for example, the fabrication and surface treatment of nanowires influences these charge recombination velocities. These determine how efficiently a solar device can convert photons into usable electrons."

Adds Schuck: "We realized that this is really the optimal way to do any kind of optical experiment one might want to do at the nano scale. So we use it for imaging and spectroscopy but we anticipate many other uses also."

This research was supported by the DOE Office of Science.

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Story Source:

The above story is reprinted from materials provided by DOE/Lawrence Berkeley National Laboratory. The original article was written by Alison Hatt.

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


Journal Reference:

  1. Wei Bao, M. Melli, N. Caselli, F. Riboli, D. S. Wiersma, M. Staffaroni, H. Choo, D. F. Ogletree, S. Aloni, J. Bokor, S. Cabrini, F. Intonti, M. B. Salmeron, E. Yablonovitch, P. J. Schuck, A. Weber-Bargioni. Mapping local charge recombination heterogeneity by multidimensional nanospectroscopic imaging. Science, December 7, 2012 DOI: 10.1126/science.1227977

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/~3/OhX5q6TMmHI/121206153640.htm

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