1 辽宁工业大学土木建筑工程学院, 锦州 121001
2 中交路桥建设有限公司,北京 100024
3 浙大宁波理工学院土木建筑工程学院, 宁波 315100
为研究高温对混杂纤维混凝土(HFRC)残余强度与微观结构演变规律的影响, 测试了HFRC在不同温度作用后的基本力学性能, 借助扫描电子显微镜研究了纤维-水泥浆体界面的微观结构, 并利用BP神经网络对HFRC在不同温度作用后的抗压强度进行了预测。结果表明: 纤维的混杂效应显著改善了混凝土的耐高温性能, 高温后HFRC的抗压强度和劈裂抗拉强度均高于素混凝土; 当纤维素纤维和玄武岩纤维体积掺量均为0.15%时, HFRC的抗压强度和劈裂抗拉强度均达到最大值; HFRC内部结构密实, 玄武岩纤维填充在孔隙处且与基体的黏结较好, 有效抑制了裂缝的扩展; 基于神经网络的预测数据与试验数据吻合, BP神经网络较好地预测了高温后HFRC的抗压强度。
混杂纤维混凝土 玄武岩纤维 纤维素纤维 力学性能 微观结构 BP神经网络 强度预测 hybrid fiber reinforced concrete basalt fiber cellulose fiber mechanical property microstructure BP neural network strength prediction
Author Affiliations
Abstract
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
We experimentally demonstrate a channel-reuse bidirectional 10 Gb/s/λ long-reach dense wavelength-division multiplexing passive optical network (DWDM-PON) and an optical beat-noise-based automatic wavelength control method for a tunable laser used in a colorless optical network unit (where λ=wavelength). A 55 km, bidirectional, 400 Gb/s (40×10 Gb/s) capacity channel-reuse transmission with 100 GHz channel spacing is achieved. The transmission performance is also measured with different optical signal to Rayleigh backscattering noise ratios and different central wavelength shifts between upstream and downstream in the channel-reuse system.
060.4510 Optical communications 060.4250 Networks Chinese Optics Letters
2015, 13(2): 020603
本文探索了POM的合成条件和单晶生长条件,测定了单晶的透光曲线和光损伤阈值.计算了POM单晶Ⅰ类和Ⅱ类位相匹配曲面轨迹,给出了实验验证结果.
非线性光学 晶体生长
