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Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Hash Hashemian: Visionary leadership
As Dr. Hashem M. “Hash” Hashemian prepares to step into his term as President of the American Nuclear Society, he is clear that he wants to make the most of this unique moment.
A groundswell in public approval of nuclear is finding a home in growing governmental support that is backed by a tailwind of technological innovation. “Now is a good time to be in nuclear,” Hashemian said, as he explained the criticality of this moment and what he hoped to accomplish as president.
Jean Ragusa, Richard Sanchez, Simone Santandrea
Nuclear Science and Engineering | Volume 157 | Number 3 | November 2007 | Pages 299-315
Technical Paper | doi.org/10.13182/NSE07-A2729
Articles are hosted by Taylor and Francis Online.
This paper treats the problem of determining equivalent homogenized cross sections that preserve a set of prescribed reference albedos obtained from a heterogeneous reflector. This equivalence problem is treated as an optimization problem where the minimum of a functional is sought. Duality is used for a direct estimation of the derivatives needed in the iterative calculation of the optimal homogenized cross sections. We analyze both diffusion and transport as low-order operators for the equivalence and propose several choices for constraining the unknown cross sections. Numerical results illustrate the new approach for one-dimensional PN core calculations.
