Electronic Design

From The Labs

Gadolinium-silicon-germanium (GdSiGe) alloys, materials that experience dramatic temperature changes in response to changing magnetic fields, may one day be used to build sensors and energy-conversion devices. Researchers at the U.S. Department of Energy's (DOE's) Ames Laboratory hope to build the foundation for such applications in a four-year DOE-supported project to investigate the properties of these alloys and related materials. The alloys are already being considered for use in temperature-regulation applications such as magnetic refrigeration.

Claiming a world-best speed record for optical data transmission, re-searchers at Siemens have transmitted 7 Tbits/s over a single optical fiber using dense wavelength-division multiplexing (DWDM). That's the equivalent of over 100 million telephone calls or a billion pages of typed data per second. The demonstration was conducted by Siemens' Information and Communication Networks Group at the company's Advanced Optical Networks Laboratories. The researchers simultaneously transmitted 176 channels of 40-Gbit/s data over a 50-km fiberoptic cable. The 40-Gbit/s channels, in turn, were produced by time-division multiplexing (TDM) using a prototype of TransXpress FOX, a multiplexer and regenerator system developed by Siemens.

The Lawrence Livermore National Lab has developed Peregrine, a computer-based medical technology that monitors radiation during cancer treatment. In three dimensions, it calculates where radiation travels in the body and measures the amount that strikes tissue, bone, and empty cavities. Doctors can use it to accurately target tumors while reducing the damage to healthy tissue. Peregrine employs a mathematical technique known as Monte Carlo that simulates the trillions of radiation particles that enter the body during treatment. Then, it accurately predicts proper radiation doses.

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