摘要：在直流输电工程中,直流金具承担着电力设备的电气连接、机械固定及均压屏蔽的作用,其运行额定电流大、容易造成局部过热,因此研究直流金具在高海拔下的温升情况十分有必要。本文以典型抱夹金具为研究对象,依据直流工程项目中常用图纸建立了电磁-热三维有限元仿真计算模型,得到了稳态条件下的温升时仿真计算结果。研究分析了同类型金具不同结构对温度场分布的影响和海拔对温度场分布的影响,得到了典型抱夹金具温度场分布情况和典型抱夹金具表面最高温度随海拔的变化曲线图,为金具结构设计、载流量控制提供了支撑,同时也为提高换流站其他设备及输电线路上设备的可靠性运行提供了重要参考。

摘要：The Water Cherenkov Detector Array （WCDA） is one of the core detectors in the Large High Altitude Air Shower Observatory （LHAASO）, and it consists of 3600 photomultiplier tubes （PMTs）. Both high resolution time and charge measurement are required over a large dynamic range from 1 photoelectron （P.E.） to 4000 P.E. The prototype of an analogue front-end Application Specific Integrated Circuit （ASIC） fabricated using Global Foundry 0.35 μm CMOS technology is designed to read out the PMT signal in the WCDA. This ASIC employs leading edge discrimination and an （RC）4 shaping structure. Combined with the following Time-to-Digital Converter （TDC） and Analog-to-Digital Converter （ADC）, both the arrival time and charge of the PMT signal can be measured. Initial test results indicate that time resolution is better than 350 ps and charge resolution is better than 10% at 1 P.E. and better than 1% with large input signals （300 P.E. to 4000 P.E.）. Besides, this ASIC has a good channel-to-channel isolation of more than 84 dB and the temperature dependency of charge measurement is less than 5% in the range 0 50℃.

摘要：随着物联网技术的发展,人们越来越钟情于智能家居,对家的期望越来越高。设计了一种基于FPGA的智能家居控制系统,该系统优点在于整个系统能够快速的运行,并且同时执行多个任务,能够处理更加复杂的逻辑,实现更加复杂的功能。该系统以采集温度、光照度等信息为例,实现环境温度、光强的实时监测,并且能够自动根据采集到的环境信息,智能地进行家居控制,为用户提供全新物联网智能家居生活体验。