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Effect of plate-fin parameters on the cooling of high heat flux electronic chips was investigated based on FLOTHERM. The simulation results indicate that the maximum temperature (T-max) decreases with the increase of base thickness (0.5-7mm) or the fin height (6-11mm). However, T-max first decreases and then increases by increasing the number of internal fins (30-60). The optimized base thickness,...
Two-dimensional phase unwrapping (PU) is a key technique in many scientific fields. In this paper, the L1-norm-based PU is implemented via a novel method, which is simpler than the classic minimum-cost network flow (MCF) method. It is proved that the network associated with the PU problem can be simplified to a weighted bipartite graph, and matching this graph can solve the PU problem with higher...
Increase of the saturation power may be approached by means of the parameter adjustment even in a uniform wiggler configuration, which is comparable to the enhancement by using a tapered wiggler. Instead of the beam-wave interaction being lengthened by the use of a wiggler taper, a substantial saturation length may be shortened by virtue of the parameter adjustment.
Irregular electron phase-orbits are harmful to the quality of the electron beam and thus deteriorates the performance of a free-electron laser (FEL). This paper shows that the plasma frequency substantially affects the electron phase-orbits, resulting in a transit from periodicity to non-periodicity.
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