简介：

简介：通过研究丁老师的教学实录,分析其教学特色：问题融入情境,提升导入质量;问题驱动探究,注重自主设计.从而反思教学应该抓住在建构数学的过程中驱动学生思考和在方法策略的选择中优化解决路径.

简介：Bysimultaneouslyemployingbothanelectro-opticmodulatorandcarbonnanotubesaturableabsorber（CNT-SA）inadual-lossmodulator,asubnanosecondsinglemode-lockingpulseunderneathaQ-switchedenvelopewithhighpeakpowerwasgeneratedfromadoublyQ-switchedandmode-locked（QML）Nd:Lu0.15Y0.85VO4laserat1.06μmforthefirsttime,toourknowledge.CNTswithdifferentwallstructures—single-walledCNTs（SWCNTs）,double-walledCNTs（DWCNTs）,andmulti-walledCNTs（MWCNTs）—wereusedasSAsintheexperimenttoinvestigatethesinglemode-lockingpulsecharacteristics.Atpumppowerof10.72W,themaximumpeakpowerof1.312MWwasobtainedwiththeDWCNT.