February 28, 2007

SCIENCE BEAT

Posted at 10:20 pm on Wednesday the 28th
Filed under: Science

Controversial, but noted FYI:

US scientists are casting doubts on the benefits of certain vitamin supplements.

Vitamins A, C and E have long been touted as ways to protect the body….

However, research published today suggests that people who take them regularly do not live longer and there is actually evidence that they die younger than people who don’t take vitamins. Article


Time and tide wait for no man. But we can tap the latter, beneficially.

Australia’s first commercial wave-generated power station will in weeks begin supplying homes south of Sydney with electricity and fresh drinking water, courtesy of the sea.

“The energy in waves is the densest of any natural sources of energy. It’s pretty much always there and it doesn’t go away like sun and wind do,” John Bell, the Chief Finance Officer from station developer Energetech told Reuters.

Lying anchored just 100 metres (yards) off a popular surf beach near Wollongong, a city of around 200,000 people just south of Sydney, the 485-tonne plant will power 500 homes along the local grid.

Electricity is generated when waves wash into a funnel facing the ocean, driving air through a pipe and into a turbine capable of pumping 500kw of clean power each day into the local grid.

The A$6 million ($4.7 million) floating plant, built to withstand a 1-in-100 year storm, can also desalinate 2,000 litres of drinking water each day for almost as many homes as it powers.

[snip]

Interest in building similar plants has come from Hawaii, Spain, South Africa, Mexico, Chile and both U.S. coasts, with Energetech having just completed a round of venture capital raising, mainly in Europe.

“Our production units will be producing one million litres of water each day and we can produce at very low cost,” Bell said.

The costs of power from the plant ranged below 10 cents per kilowatt of electricity and under A$1 per 1,000 litres of water.

The Portland plants, floating like an ocean-bound wind farm, would produce 10 megawatts, enough for around 15,000 homes.

The turbine at the heart of the station employs new techology which allows it to spin in the same direction, irrespective of wind direction in the tunnel.

“We believe its got the best chance of any of those natural sources to get close to, or we believe get below, the cost of fossil fuel,” Bell said. Article

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