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» Bullet-train planners face huge engineering challenge

The 141-mile section from Bakersfield to L.A. will travel over two mountain ranges and more than half a dozen earthquake faults. Experts see it as the project of the century.

The plan calls for bullet trains to shoot east from Bakersfield at 220 mph, climbing one of the steepest sustained high-speed rail inclines in the world. It would soar over canyons on viaducts as high as a 33-story skyscraper. The line would duck in and out of tunnels up to 500 feet below the rugged surface. It would cross more than half a dozen earthquake faults heading toward L.A.

latimes, 12.11.12

» Bay Bridge's east span Big Lift begins


A cross-section of a suspension cable shows how it is made up of bundles of individual cables. Photo: Carlos Avila Gonzalez

As state lawmakers contemplate an independent inspection of the new Bay Bridge tower foundation, construction crews are beginning what might be called the Big Lift — a major step in building the $6.3 billion east span, scheduled to open by Labor Day 2013.

Workers on Tuesday began the three-month process of lifting the 35,200-ton bridge decks from the temporary steel trestles on which they were assembled onto the tower and main suspension cable that will cradle and support the suspension span. As they started work, a state Senate committee grilled Caltrans over media allegations of irregularities in concrete inspections for the tower’s foundations…

sfgate, 16.08.12.

smarterplanet:


Japanese breakthrough will make wind power cheaper than nuclearA surprising aerodynamic innovation in wind turbine design called the ‘wind lens’ could triple the output of a typical wind turbine, making it less costly than nuclear power.


mothernaturenetwork, 29.08.11.
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