浅谈复杂条件下铁路复线路堑石方爆破设计与施工

朔黄铁路扩能改造工程西柏坡车站K242+700-K243+950段咽喉区石质路堑爆破扩堑开挖由于紧临既有电气化铁路,受施工现场环境与地质情况的限制,如何安全、快速地完成施工是本车站新线能否如期开通,能否及时扩大运能满足生产需要的关键。根据既有铁路施工特点,既要确保火车运行安全、又要满足进度要求,在借鉴衡广、株六、宝成、神朔、襄渝等复线石方施工成功经验后,拟定采用爆破松动、机械辅助开挖的方案。此方案能否顺利实施的关键是爆破作业设计与施工。

铁路复线曲线群地段的线间距计算

本文提出铁路复线设计中曲线群地段线间距的一种快捷计算法。

整合课程资源 优化教学设计 提高活动质量——小学品德课堂存在问题及解决策略

面对基层学校品德教学现状,在整合课程资源、优化教学设计、提高活动质量上下功夫,就能实现基于课标的品德教学,尽快提高广大基层教师的执教能力,最大限度创建高效课堂,全面提升小学品德课教学质量和小学生品德素质。

Design and fabrication of ultrasmall arrayed waveguide grating multiplexers based on Si nanowire waveguides

The large refractive index difference between Si and SiO2 makes it possible to realize ultrasmall photonic integrated circuits. A 5×5 ultracompact arrayed waveguide grating multiplexer based on 500×250 nm Si nanowire waveguides is designed and fabricated by using the technologies of E-beam writing and amorphous-Si deposition. The mea- sured channel spacing is about 1.5 nm (close to the design value) and the channel crosstalk is about –8 dB.

Design of a new vacuum Compton gamma-ray detector with clad metal electron-converter plate

A newly designed vacuum Compton gamma-ray detector with Ta-Al clad-metal electron converter plate is described. The detecting efficiency for 1.25 MeV gamma-ray is 7.85×10-3 electron/γ,which is 2.5 times higher than that with Fe converter plate. The designed detector has the merits of well processed and static vacuum keeping and can be used for intense pulsed gamma ray detecting.