The Spectral Energy Flux(SEF) algorithm for the onset of music signal is verified, and the influences of the SEF on the detected performance are evaluated in detail.

对乐音信号起始时刻检测的谱能流法进行了验证，详细分析了该算法各环节对检测性能的影响。

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Setting up as an SEF entails a hefty investment in systems to connect banks and their clients, as well as clearing-houses, where all trades conducted on an SEF will ultimately end up.

ECONOMIST: Derivatives exchanges

The Sex Education Forum (SEF) says that the plans leave a gap in teaching about reproduction in primary school.

BBC: Curriculum plan 'waters down sex education' experts warn

Ar hyn o bryd mae tua 35, 000 o enedigaethau y flwyddyn yng Nghymru, sef 6, 000 yn fwy ers 2002.

BBC: Pwyllgor Plant a Phobl Ifanc