Monthly Archives: July 2011

Caltech Researchers Create the First Artificial Neural Network Out of DNA

Researchers at the California Institute of Technology (Caltech) have now taken a major step toward creating artificial intelligence—not in a robot or a silicon chip, but in a test tube. The researchers are the first to have made an artificial neural network out of DNA, creating a circuit of interacting molecules that can recall memories based on incomplete patterns, just as a brain can.

“The brain is incredible,” says Lulu Qian, a Caltech senior postdoctoral scholar in bioengineering and lead author on the paper describing this work, published in the July 21 issue of the journal Nature. “It allows us to recognize patterns of events, form memories, make decisions, and take actions. So we asked, instead of having a physically connected network of neural cells, can a soup of interacting molecules exhibit brainlike behavior?”

The answer, as the researchers show, is yes. Continue reading


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A Solar Thermal First: Power Around The Clock

Solar power’s perennial weakness – its inability to provide electricity after nightfall or during cloudy weather – might be vanishing: The Spanish company Torresol Energy said its solar thermal plant in Seville was recently able to pump out electricity uninterrupted for 24 consecutive hours.

The Gemasolar plant in Fuentes de Andalucía – which began operating barely a month ago – was able to keep the juice flowing using an innovative technique that stores energy in molten salt. This allows for up to 15 hours of electricity production in the absence of solar radiation, stretching the plant’s production into the night and keeping it running during heavy cloud cover.

While the plant, which can produce enough power to supply 25,000 homes, was able to pull off an around-the-clock cycle of power production, Torresol said it doesn’t expect that level of production all the time. “The high performance of the installations coincided with several days of excellent solar radiation which made it possible for the hot-salt storage tank to reach full capacity,” said Diego Ramírez, director of production at Torresol. “We’re hoping that in the next few days our supply to the network will reach an average of 20 hours a day.”

The 19.9-megwatt capacity Gemasolar plant uses a “power tower” system, with 2,650 mirrors bouncing sunlight to the top of a 140-meter tower at the center of the circle of mirrors. Torresol said a super-efficient receiver absorbs 95 percent of the radiation aimed at it, heating molten salts inside the tower to more than 500 degrees Celsius. The hot molten salts are then stored for use when the sun goes down or when clouds move in.

by Jasmine Greene, from Earth Techling

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New sensor to measure structural stresses can heal itself when broken

Researchers from North Carolina State University have designed a sensor that can measure strain in structural materials and is capable of healing itself – an important advance for collecting data to help us make informed decisions about structural safety in the wake of earthquakes, explosions or other unexpected events. Continue reading

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Wireless Electricity Demo

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Filed under Electricity