某特大桥大体积混凝土温度控制及防裂措施

结合工程概况，分析了混凝土产生温度裂缝的原因，介绍了京广铁路改造工程孝子店1号特大桥大体积混凝土浇筑的温度控制及防裂措施，以提高大体积混凝土结构的整体性和耐久性。     

全句推导

在一般的单元归结(unit-resolution)中,证明一个子句S是不可满足的,通常是从S中取一个子句C,然后设法将C中的文字逐次归结掉,最后得出空子句.在归结某文字时,一般是在子句集中盲目搜索可与该文字归结的单元子句;可能在归结到某一步时,发现由该子质推导不出空子句,再取另一个子句重新归结.另外,对于一个子句C=L_1,L_2…L_n,由于选择文字进行归结的次序不同,可能有很多重复性的工作.     

High-speed real-time visible light communication system based on InGaN/GaN-base multi-quantum well blue micro-LED

Visible light communication (VLC) technology is a new type of wireless communication technology, which employs a light source as the carrier of information to realize illumination and communication simultaneously. This paper adopts a single InGaN/GaN-base multi-quantum well blue micro-light emitting diode (LED) as the light source, designs pre-emphasis circuit, LED driver circuit, impedance matching network, etc., and builds a high-speed real-time VLC system. It has been verified that the LED achieves a 3 dB modulation bandwidth of 450 MHz or more; and the real-time communication rate reaches over 800 Mbit/s at a distance of 2 m. The communication bit error rate (BER) is as low as at a communication rate of 622 Mbit/s. Experimental indicators including 3 dB bandwidth, communication rate, and communication BER are all taken into account. Therefore, this VLC system supports high-quality high-speed real-time communication.     

多年冻土区墩台身混凝土养护技术

以巴拉大才曲特大桥墩台身混凝土养护为例,介绍了青藏铁路多年冻土地区墩台身采用暖棚法煤炉养护、暖风机养护的施工工艺、方法及效果,并得出了养护效果良好的结论,可供类似工程参考借鉴。