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| 1 | 基于微震监测的大岗山高拱坝坝踵蓄水初期变形机制研究显示文摘混凝土高拱坝坝踵是蓄水初期阶段拱坝安全的重点关注部位。通过构建国内首套高拱坝坝踵微震监测系统,实现对蓄水初期阶段大岗山拱坝坝踵区微破裂的实时监测,探究坝踵蓄水初期变形机制及其与微震活动性的关系。采用人工敲击试验确定坝踵等效P波波速为4 300 m/s,系统定位误差小于8 m。对系统获取的事件波形进行噪声滤除,并在自动定位基础上进行人工二次校核,提高定位精度,验证了微震监测技术应用于大体积混凝土工程的可行性。分析认为:蓄水初期阶段,大岗山高拱坝坝踵区微震活动性与库水位密切相关,微震事件聚集区实现从坝踵向坝趾的转移,坝踵压缩变形减小,而坝趾区变形量增加。此外,通过拱坝坝踵区微震变形演化过程,揭示了导流洞下闸蓄水前940 m高程基础廊道拱顶裂缝产生的根本诱因。研究成果可为混凝土高拱坝微震监测和真实工作性态研究提供参考。 | 马克 金峰 唐春安 吕鹏飞 庄端阳 | 2017 | 岩石力学与工程学报2017，36，5： | 6 |
| 2 | Enhancement in light output power of LEDs with reflective current blocking layer and backside hybrid reflector显示文摘A GaN-based light-emitting diode (LED) with reflective current blocking layer (CBL) underneath p-electrode pad and backside hybrid reflector was fabricated and investigated. With a 20 mA injection current, the LED with SiO2 /ITO/Al reflective CBL deposited on naturally textured p-InGaN/p-GaN surface exhibited a light output power that was 7.6% and 18.5% higher than those of the textured LEDs with SiO2 CBL and without SiO2 CBL, respectively. The LED with backside hybrid reflector exhibited a light output power that was 30% higher than that of LED without the hybrid reflector. The enhancement in light output power is attributed to the improved current spreading performance via the SiO2 CBL, the Al omnidirectional metal reflector to prevent the light absorption by the opaque p-electrode pad, and the backside hybrid reflector to extract bottom-emitting light. | ZHOU ShengJun FANG Fang CAO Bin LIU Sheng DING Han | 2013 | Science China(Technological Sciences)2013，56，6： | 1 |
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