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Design007-Jan2019

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84 DESIGN007 MAGAZINE I JANUARY 2019 finite elements was used for all simulations in this article. Step-by-step instructions on how to set up analysis of single and coupled traces over meshed planes [6] . Note that traces in BGA fields, with close via fences, and some other structures can also be formalized and simulated as the periodic structures. This is an elegant, accurate alternative to the brute-force approach of an exhaustive 3D EM analysis of a complete link. DESIGN007 References 1. Y. Shlepnev, "Advanced stackup planning with impedance, delay and loss validation," June 28, 2018. 2. R. E. Collin, Field Theory of Guided Waves, Wiley-IEEE Press, 1991. 3. D. Pozar, Microwave Engineering, Wiley, 2012. 4. Simbeor Demo Videos 5. Y. Shlepnev, "Life beyond 10 Gbps: Localize or Fail!" April 13, 2018. 6. Simbeor Application Notes Yuriy Shlepnev is founder and president of Simberian Inc. Figure 8: Near-end crosstalk (NEXT) and far-end (FEXT) crosstalk (left) and corresponding insertion loss (right) for 10-cm traces over a meshed plane for traces over the cutouts and mostly over the conductor. Oak Ridge National Laboratory scientists studying fuel cells as a potential alternative to internal combustion engines used sophisticated electron microscopy to investigate the benefits of replacing high-cost platinum with a lower cost, carbon-nitrogen-manganese-based catalyst. "We used electron microscopy to demonstrate that atomically dispersed manganese can act as an oxygen reduction reaction catalyst while also increasing durability," said David Cullen, R&D Staff at ORNL. Fuel cell technologies hold promise for use in vehicles because of their high-power density, low operating temperature and carbon-free emissions. Yet, the high cost associated with platinum-based catalysts and insufficient durability of alternative platinum-free catalysts remains a market barrier. "Our team's finding could open up the potential for widespread use in transportation and other energy conversion applications," said Cullen. ORNL researchers were part of a team that produced the results published in Nature Catalysis. (Source: Oak Ridge National Laboratory) Powering Up Fuel Cells

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