Source: http://news.feedzilla.com/en_us/stories/politics/top-stories/313114268?client_source=feed&format=rss
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Sunday, June 16, 2013
Saturday, June 15, 2013
Damn that's a huge bitch.
Damn that's a huge bitch. Maersk shipping just christened the Mc-Kinney M?ller, the company's largest Triple E class vessel and the newest "biggest ship in the ocean
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Thursday, June 13, 2013
Autonomous energy-scavenging micro devices will test water quality, monitor bridges, more
June 13, 2013 ? Out in the wilds or anywhere off the grid, sophisticated instruments small enough to fit in a shirt pocket will one day scavenge power from sunlight, body heat, or other sources to monitor water quality or bridge safety, enabling analysis in the field rather than bringing samples and data back to the lab.
Researchers at the University of Waterloo in Ontario are using optics and photonics in their quest to "bring the lab to the sample," said lead researcher Vassili Karanassios, director of the university's Institute for Nanotechnology. A major aspect of his team's solution, reported in a conference and publication by SPIE, the international society for optics and photonics, is scavenging energy from various sources to power instruments at the sample site.
While energy harvesting utilizes sources such as wind power, energy scavenging involves re-using discarded energy, such as the electric light that runs a calculator, Karanassios said.
The team is incorporating wake-up systems in the devices to support energy autonomy, the ability to be powered as needed without an external source, without losing selectivity, the ability to gather and accurately analyze relevant data.
An important feature of his lab's approach is the integration of several features of full-scale laboratory instruments.
"People have experimented with sensors and with lab-on-a-chip devices for a long time," Karanassios said. "But taking an entire instrument to the field in a hand-held device is new. Not many research groups have the expertise to integrate it all, to go from the sensor level to the micro-instrument level."
The team is also working to reduce the power required for miniature instruments that perform optical emission spectrometry -- using light to generate the spectral patterns that are intrinsically unique to materials -- with very small samples. The resulting spectral "signature" is used to identify what is in the sample, for example, in on-site monitoring of water quality.
Among power source optics, sunlight is one obvious answer, Karanassios said, but limited by clouds and brief daylight in some regions. Additional possible sources and applications for energy scavenging are:
- Plugging in to human body heat, unobtrusively scavenging energy in the form of otherwise-wasted heat generated by a person while walking, to power instruments for testing water quality or wearable biomedical monitors.
- Harnessing animal body heat, to recharge implanted tracking devices. "When tagging and tracking animals in the wild, you do not want to have to catch the same animal one more time just to replace the battery that powers its sensors," Karanassios noted.
- Charging up a bridge sensor using mechanical energy generated in a spring-loaded device in the road, activated by vehicles crossing the bridge.
Because smaller sensors and instruments require less power, Karanassios' lab is working toward "shirt-pocket size" micro-instruments that eventually will deliver performance comparable to full-size lab versions.
They have experimented with a device the size of sugar cube that can be used along with a portable spectrometer for rapid screening of environmental contaminants, using spectral lines generated by wavelengths in the visible light and ultraviolet regions.
A paper detailing the work by Karanassios and Waterloo colleagues Donghyun Lee and Gurjit Dulai was published 28 May in the SPIE Digital Library, and presented in a conference on Energy Harvesting and Storage at SPIE defense, securit, and sensing meeting DSS 2013 last month in Baltimore. Titled "Survey of energy harvesting and energy scavenging approaches for on-site powering of wireless sensor- and microinstrument-networks," the paper is available via open access through 31 August 2013.
Source: http://feeds.sciencedaily.com/~r/sciencedaily/top_news/~3/bh7kW1vQAlU/130613153343.htm
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Wednesday, June 12, 2013
Unusually massive line of storms aim at Midwest
WASHINGTON (AP) ? A gigantic line of powerful thunderstorms could affect one in five Americans on Wednesday as it rumbles from Iowa to Maryland packing hail, lightning and tree-toppling winds.
Meteorologist are warning that the continuous line of storms may even spawn an unusual weather event called a derecho (duh-RAY'-choh), which is a massive storm of strong straight-line winds spanning at least 240 miles. Wednesday's storms are also likely to generate tornadoes and cause power outages that will be followed by oppressive heat, said Bill Bunting, operations chief at the National Weather Service's Storm Prediction Center in Norman, Okla.
The risk of severe weather in Chicago, Indianapolis, Cincinnati and Columbus, Ohio, is roughly 45 times higher than on a normal June day, Bunting said. Detroit, Baltimore, Washington, Milwaukee, Pittsburgh and Louisville, Ky., have a risk level 15 times more than normal. All told, the area the weather service considers to be under heightened risk of dangerous weather includes 64 million people in 10 states.
"It's a pretty high threat," Bunting said, who also warned that the storms will produce large hail and dangerous lightning. "We don't want to scare people, but we want them to be aware."
Wednesday "might be the worst severe weather outbreak for this part of the country for the year," said Jeff Masters, meteorology director at Weather Underground.
You can have tornadoes and a derecho at the same time, but at any given place Wednesday the straight-line winds are probably more likely.
Last year, a derecho caused at least $1 billion in damage from Chicago to Washington, killing 13 people and leaving more than 4 million people without power, according to the weather service. Winds reached nearly 100 mph in some places and in addition to the 13 people who died from downed trees, another 34 people died from the heat wave that followed in areas without power.
Derechoes, with winds of at least 58 mph, occur about once a year in the Midwest. Rarer than tornadoes but with weaker winds, derechoes produce damage over a much wider area.
Wednesday's storm probably won't be as powerful as 2012's historic one, but it is expected to cause widespread problems, Bunting said.
The storms are the type that will move so fast that "by the time you see the dark sky and distant thunder you may have only minutes to get to safe shelter," Bunting said.
The storms will start late morning or early afternoon in eastern Iowa, hit Chicago by early afternoon and move east at about 40 mph, Bunting said. If the storm remains intact after crossing the Appalachian Mountains, which would be rare for a derecho, it should hit the Washington area by late afternoon or early evening, he said.
For Washington, Philadelphia and parts of the Mid-Atlantic the big storm risk continues and even increases a bit Thursday, according to the weather service.
___
Online:
The Storm Prediction Center: www.spc.noaa.gov
Seth Borenstein can be followed at http://twitter.com/borenbears
Source: http://news.yahoo.com/unusually-massive-line-storms-aim-midwest-070531169.html
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