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Sunday, March 21, 2010

WE CAN GET WATER FROM HELIOS AND HIS SONS AND DAUGHTERS


PUMPING  UP   THE FOSSIL WATER (GROUNDWATER),DOESNT RESOLVES THE  PROBLEM FOR PEOPLE'S NEEDS.THESE NATURAL  TANKS  ARE HAVING A SIGNIFACANCE ROLE FOR THE UNDERGROUND LIFE'S ENVIRONMENT,WHICH WE HAVEN'T YET STUDIED CAREFULLY.
LANDS LIKE SAUDI ARABIA HAVE  MODERN SOLUTIONS WHICH CAN OFFER PLENTY OF WATER,EITHER BY ORGANIZING BETTER CONSERVATION POLICIES(MIN.CONSUMPTION,RECYCLING,USE AND DEPOSIT  OF RAIN WATER,TRADITIONAL LOCAL PLANTATION AND NOT DEVELOPING ONE WHICH DOESNT BELONG TO THE CLIMA OF THE MENTIONED TERRITORY ETC) OR BY USING THE NEWER METHODS,WITH GREEN ENERGY FOR DESALINATION OF THE SEAWATER (EG.COMBINATION OF SUN-WIND POWER ENERGY PRODUCTION FOR DESALINATION PURPOSES AND NOT ONLY ETC ).
IT IS VERY EASY FOR  COUNTRIES LIKE SAUDI ARABIA TO FINANCE SUCH RESEARCH AND PROJECTS WHICH CAN AUGMENT THE PARTICIPATION OF DESALINATED SEAWATER ,FOR HUMAN ACTIVITIES,FROM 8% UP TO 50%.EVEN IF THEY ALREADY HAVE INVESTED AT LARGE SCALE DESALINATION PLANTS,THE USED  ENERGY ISN'T CARBON FREE.
WE CAN READ ABOUT SUCH AN IDEA ,ONLY A SOLAR ONE,AT AUSTRALIA ,IF WE CLIK ON THE TITLED LINK.
THANK YOU
AGGELOS


Searching for Water under the Sands of Saudi Arabia

Water is scarce in arid Saudi Arabia. Now the king has hired a team of German scientists to search for groundwater trapped in aquifers beneath the massive kingdom's sands. Their pioneering work could provide solutions for other desert countries.

German geologist Randolf Rausch, 59, is showing his visitors the desert. He walks nimbly across the narrow crest of a sand dune, pointing his toes outward like a ballet dancer. The wind blows away his tracks immediately and tugs at his green Tyrolean hat.

The guests, who are from the southwestern German city of Darmstadt, trudge along behind him, panting in the silence. The air temperature in the Ad Dahna Desert at this time of the year is only about 32 degrees Celsius (90 degrees Fahrenheit), which is 20 degrees Celsius cooler than in the summer. The air is dry, clear and odorless. Rausch stops at the highest point on the dune and gazes out over a seemingly endless landscape of shimmering, copper-colored dunes.


"This here," he says, with a strong Swabian accent, "is every geologist's dream."

Finding Fossil Groundwater

Rausch has been working for GTZ International Services, part of Germany's federal GTZ development agency, in Riyadh for the last six years. The Saudi king has hired him and his visitors, who are from the Technical University of Darmstadt, to search for water in the desert. By drilling holes up to 2,000 meters (6,560 feet) deep, conducting pumping tests, and applying complex measuring techniques and computer models, they are trying to find out how much fossil groundwater remains stored between layers of rock beneath the Arabian Peninsula.

The Helmholtz Center for Environmental Research (UFZ) in the eastern German city of Leipzig is also involved in the large-scale project. "Using....(more at   http://www.spiegel.de/international/world/0,1518,684360-2,00.html  )

SOURCE DERSPIEGEL

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Monday, March 08, 2010

Light better than radio waves for wireless AND everyone may see the light

Optical transmission is key to secure and rapid indoor communications

WASHINGTON, USA: Light is better than radio waves when it comes to some wireless communications, a new study has found.

Optical communications systems could provide faster, more secure communications with wider bandwidth and would be suitable for restricted areas like hospitals, aircraft and factories.

Sending information via light waves either in physical light guides or wirelessly is not new, but existing wireless systems either require direct line of sight or are diffused and have low signal strength.

Penn State University (PSU) engineers chose to take a different approach using multi-element transmitters and multi-branch optical receivers in a quasi-diffuse configuration.

The system uses a high-powered laser diode - a device that converts electricity into light - as the optical transmitter and an avalanche photo diode, a device that converts light to electricity, as the receiver. The light bounces off the walls and is picked up by the receiver.

"Unless the walls are painted solid black, there is no need to worry about transmission within a room," said Jarir Fadlullah, PSU graduate student in electrical engineering.

The researchers tested infrared light, but the system will also work with visible light and ultraviolet light.

"The optical system we have offers a very large bandwidth thus a very high speed," said Fadlullah. "We can send one gigabit per second or more over a gigahertz band."

The researchers, including Mohshen Kavehrad, PSU professor of electrical engineering, think this looks like an ideal system.

Radio frequency systems do not require line of sight transmission, but can pass through some substances and so present a security problem, said a release.

The study was presented Wednesday at SPIE Phonotics West Conference in San Francisco.
©IANS

SOURCE http://www.ciol.com/


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