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Nailing Down the Jet Stream

First-of-a-kind framework diagnoses the behavior of the jet stream in climate models

September 2015
The complex models scientists rely on to determine weather and potential climate changes have a hidden flaw. They cannot agree on the behavior of one of the most important circulation features: the jet stream. Now, research led by PNNL has developed a diagnostic framework that can predict how well a model will simulate the jet stream. This framework may prove a milestone in accurately capturing jet stream dynamics and location.

Better Batteries

Imaging the nanoscale world inside a battery

August 2015
Rechargeable Li-ion batteries are common in portable electronics and in today’s plug-in hybrid electric vehicles. Current generation cathode materials lose their structural integrity after repeated charge-discharge cycling, resulting in voltage fading and capacity loss. Understanding the actual mechanisms of degradation is needed to design longer lasting and higher performance batteries, but degradation has been extremely difficult to study in detail due to the challenge of imaging and quantifying the distribution of light elements in Li-ion battery electrodes. To examine this degradation process in unprecedented detail, researchers are using a variety of advanced methods to monitor changes in the distribution of elements in fresh cathodes and cathodes at different stages of cycling. The new measurements have revealed an obscure and unexpected capacity-loss mechanism that occurs in some formulations of a new electrode being designed to enhance performance of advanced Li-ion batteries.

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