光通信用IOGHzCMOS八分频器设计     

邓文娟  雷鑑铭 《华东地质学院学报》2009,32(3):289-292

在比较反转触发器（TFF）的各种结构基础上,采用一种单时钟信号控制,实现高速分频的电路结构,设计实现了用于光通信中时钟数据恢复电路的八分频器。该八分频器使用动态负载,输出两路互补信号,采用SMIC0．18um1P6MCMOS工艺,使用Cadence公司的Spectre仿真器进行模拟验证,实验结果证明,在电源电压为1．8V的情况下,该八分频器的工作速度10GHz、功耗仅为4．705mW。  相似文献   

Test on application of distributed fiber optic sensing technique into soil slope monitoring   总被引：4，自引：1，他引：3  

Bao-jun Wang  Ke Li  Bin Shi  Guang-qing Wei 《Landslides》2009,6(1):61-68

Brillouin optical time-domain reflectometer (BOTDR), a newly developed distributed fiber optic sensing technique, has been proved to be a very suitable and useful technique for monitoring and early warning of structural engineering by laboratory tests and practical projects due to its unique functions, such as distributing, long distance, anti-electromagnetic interference, waterproof, etc. However, its application to geotechnical engineering, especially soil-slope engineering, has been less carried out due to the complexity of the characteristics of geotechnical materials in the field. In this paper, BOTDR technique is applied to monitor the deformation of a laboratory soil-slope model in small scale in order to test the feasibility and early-warning characteristics of this technique with monitoring the deformation of soil slope. Different types of optical fibers are planted directly in the soil-slope model or bonded to geotextiles and geogrids that are planted in the fillings of the test model. Strain measurements of the model slope under various loads are obtained by BOTDR. By data processing and analysis, the abnormal strains can be obtained distributively, and the position of the abnormal strains can be located as well. The results show much valuable information for applications of BOTDR technique into soil-slope engineering. The test proves that the BOTDR technique can be used to ensure the stability of artificial soil slope and is useful for monitoring and early warning of the artificial soil-slope engineering.  相似文献   

膜蒸馏处理乳化油废水的实验研究     

王斯佳  蔡蕊  孙求实  袁文真  吕颖 《世界地质》2009,28(2):261-264

采用自制的中空纤维膜蒸馏组件对模拟的乳化油废水进行膜蒸馏处理研究, 分析了料液的浓度、流速、温度和处理时间等因素对膜通量及去除率的影响。实验结果表明: 在料液温度为50℃、流速为14 mL /min、乳化油浓度为500 mg/L 的条件下, 运行1 h后乳化油膜通量为21.20 g/m2 ·h, 去除率> 70%; 运行5 h后膜通量下降为5.141 g/m2 ·h, 去除率> 90%。  相似文献   

碳纤维布加固钢筋混凝土梁的现场实荷加载试验     

周江  史群飞  王伟 《岩土工程技术》2012,26(4):212-214,F0003

通过对某工程中的钢筋混凝土梁采取粘贴碳纤维布的方式进行加固,并现场抽取试验梁进行了现场堆载实荷加载试验,对试验梁的挠度、裂缝开展情况和承载能力进行了全面分析,对该加固工程的效果进行了评价,供同行参考。  相似文献   

Cotton Fiber/ZrO2, A New Material for Adsorption of Cr(VI) Ions in Water     

Alfredo Alberto Muxel  Sonia Maria Nobre Gimenez  Flaveli Aparecida de Souza Almeida  Rení Ventura da Silva Alfaya  Antonio Alberto da Silva Alfaya 《洁净——土壤、空气、水》2011,39(3):289-295

The natural cotton fiber was used to synthesize an anion exchange, containing ZrO₂ film on its surface, NCFZC (natural cotton fiber/ZrO₂ composite). This anion exchanger was produced by the reaction of the zirconium oxychloride and hydroxyl groups on surface of the natural cotton fiber. The material was used for Cr(VI) ions adsorption studies. Adsorption equilibrium time and optimum pH for Cr(VI) adsorption were found to be 6 h and 4.0, respectively. The Langmuir and Temkin isotherms were used to models adsorption equilibrium data. The adsorption capacity of NCFZC was found to be 1.33 mmol/g. Kinetic studies showed that the rate of adsorption of Cr(VI) on NCFZC obeyed a pseudo‐second‐order kinetic model.  相似文献   

基于OpenSees的钢筋混凝土桥墩拟静力试验数值分析   总被引：3，自引：1，他引：2  

李贵乾  郑罡  高波 《世界地震工程》2011,27(1)

以4个呈弯曲破坏形态的圆形钢筋混凝土桥墩的拟静力试验结果为依据,基于OpenSees中的Beamwith Hinges Element单元,建立了相应的桥墩滞回分析纤维单元模型。由模拟结果与试验结果对比可知,所建立的纤维单元模型对桥墩的骨架曲线及滞回曲线都有良好的模拟效果,且能体现桥墩在反复加载过程中刚度、强度退化现象,表明了模型的有效性。  相似文献   

用于断层测量的温度补偿光纤外腔型法布里-珀罗位移传感器     

彭华  马秀敏  王震  崔留住  江毅 《地质力学学报》2013,19(3):315-324

针对光纤EFPI传感器通常尺寸很小,而断层尺寸相对较大,导致光纤EFPI传感器在待测断层处安装不便的情况,提出了一种可用于断层测量的光纤外腔型法布里-珀罗位移传感器.两根陶瓷插芯从陶瓷套管的两端插入构成EFPI结构,通过使用金属内管和金属外管,增大了光纤EFPI位移传感器的尺寸;并且金属外管的两端采用O型圈密封,因此该EFPI位移传感器能够防水防尘.为了消除温度对EFPI位移传感器的影响,两根金属内管采用了不同热膨胀系数的材料在结构上进行温度补偿.在温度连续变化的环境下,对腔长为718.39 m的EFPI位移传感器进行了测量.测量结果显示,经过温度补偿设计后,位移传感器的温度系数由0.14 μm/℃下降到了-0.04 μm/℃,并呈现过补偿.  相似文献   

Shake table study on an ordinary low‐rise building seismically isolated with SU‐FREIs (stable unbonded‐fiber reinforced elastomeric isolators)     

Hamid Toopchi‐Nezhad  Michael J. Tait  Robert G. Drysdale 《地震工程与结构动力学》2009,38(11):1335-1357

This paper reports on the investigation of novel fiber reinforced elastomeric isolator (FREI) bearings, which do not have thick end plates, and are used in an unbonded application. Owing to the stable lateral load‐displacement response exhibited by the unbonded FREI bearings, the proposed bearings are referred to as stable unbonded (SU)‐FREIs. A shake table test program was conducted on a two‐story test‐structure having well‐defined elastic response characteristics. Compared with the results for the corresponding fixed base (FB) structure, the peak response values, distribution of lateral response throughout the height of the structure, and response time histories of the tested base isolated (BI) structure indicate that significantly improved response can be achieved. This study clearly indicates that SU‐FREI bearings can provide an effective seismic isolation system. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

基于分布式光纤传感技术的渗流监测理论研究   总被引：6，自引：1，他引：5  

肖衡林  鲍华  王翠英  蔡德所 《岩土力学》2008,29(10):2794-2798

从阐述多孔介质传热过程出发,逐一分析了在非渗流及渗流情况下,光纤与多孔介质之间的传热过程,详细分析了光纤与水流对流的传热过程,推导了多孔介质中渗流水和光纤之间的换热系数计算公式。在一定假设条件下,推导了导热系数（渗流流速）、加热功率和温升的非渗流情况与渗流情况监测理论方程,为分布式光纤传感技术监测渗流的应用提供了坚实的理论基础。  相似文献   

沿高度变刚度复合墙板结构弹塑性分析     

姜南  王真 《地震工程与工程振动》2009,29(3)

本文研究沿高度变刚度混凝土灌芯纤维石膏墙板结构(以下简称复合墙板结构)在水平荷载作用下的受力机理,建立简化计算模型,推导出了复合墙板结构的受力破坏路径,并建立了各阶段内力计算方法及计算公式。通过实例计算,得到沿高度均匀结构以及非均匀结构在水平荷载情况作用下位移的曲线与非均匀结构的受力破坏路径。结果表明,沿高度适当改变灌芯方式,侧移曲线更趋合理;各区段结构破坏路径均是石膏板先开裂且先达到极限状态。  相似文献