Coherent B2-ordered NiAl-type precipitates have been used to reinforce solid-solution body-centered-cubic iron for high-temperature application in fossil-energy power plants. In this study, we investigate the stability of nano-sized precipitates in a NiAl-strengthened ferritic alloy at 700-950 °C using ultra-small angle X-ray scattering and electron microscopies. Here we show that the coarsenin...

where the infimum and supremum are taken over all stopping times τ of Z . We show that the following strategy is optimal in the first problem: if μ ≤ 0 stop immediately; if μ ∈ (0, σ) stop as soon as Mt/Zt hits a specified function of time; and if μ ≥ σ wait until the final time T . By contrast we show that the following strategy is optimal in the second problem: if μ ≤ σ/2 stop immediately, an...

Memory retrieval is considered to have roles in memory enhancement. Recently, memory reconsolidation was suggested to reinforce or integrate new information into reactivated memory. Here, we show that reactivated inhibitory avoidance (IA) memory is enhanced through reconsolidation under conditions in which memory extinction is not induced. This memory enhancement is mediated by neurons in the a...

Selenium is an essential trace element of importance to human biology and health. Increasing evidence suggests that this mineral plays an important role in normal growth and reproduction in animals and humans, and selenium supplementation is now recommended as part of public health policy in geographical areas with severe selenium deficiency in soil. This review addresses the biological functio...

An algorithm is presented for reconstructing a quadtree from its quadtree medial axis transform (QMAT). It is useful when performing operations for which the QMAT is well suited (e.g., thinning of an image). The algorithm is a postorder tree traversal which propagates the subsumption of each BLACK QMAT node in the eight possible directions. Analysis of the algorithm shows that its average execu...