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In this issue:
Aqua Dulce, Aqua Sala: Fresh and Ocean Water Power New Type of Battery
Tips for Successful Procurement: Statement of Work Writing Workshop April 6

SLAC Today

Tuesday - March 29, 2011

Aqua Dulce, Aqua Sala: Fresh and Ocean Water Power New Type of Battery

The mouth of the Amazon River, where the world's largest drainage basin flows into the Atlantic Ocean. A location such as this, where fresh and sea water mix, is a good spot for generating electricity with Yi Cui's new battery. (Image: NASA.)

Stanford and SLAC researchers have developed a battery that takes advantage of the difference in salinity between freshwater and seawater to produce electricity.

Anywhere freshwater enters the sea, such as river mouths or estuaries, could be potential sites for a power plant using such a battery, said Yi Cui, associate professor of materials science and engineering at Stanford and associate professor of photon science at SLAC, who led the research team. The work was partially supported by SLAC's Laboratory Directed Research and Development program.

The theoretical limiting factor, he said, is the amount of freshwater available. "We actually have an infinite amount of ocean water; unfortunately we don't have an infinite amount of freshwater," he said.

As an indicator of the battery's potential for producing power, Cui's team calculated that if all the world's rivers were put to use, their batteries could supply about 2 terawatts of electricity annually—roughly 13 percent of the world's current energy consumption. 

The battery itself is simple, consisting of two electrodes—one positive, one negative—immersed in a liquid containing electrically charged particles, or ions. In water, the ions are sodium and chlorine, the components of ordinary table salt.

Read more in Stanford Report...

Tips for Successful Procurement:
Statement of Work Writing Workshop April 6

(Image - writing workshop)

SLAC's Supply Chain Management Department will host a 90-minute workshop entitled "Preparing a Statement of Work" on Wednesday, April 6 from 9 a.m. to 10:30 a.m. in the Kavli Auditorium. The review is intended for all SLAC employees who find it necessary to seek an outside source for a product or service.

Frequently, requestors are challenged with what to include in a Statement of Work, or SOW, and how to ensure that they obtain the product or service they require. The SOW is the foundation for an outside subcontract and the omission of key elements can delay the procurement process. Please join us as we describe the key components that lead to placing a successful subcontract.

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