低周反复荷载下弯剪破坏钢筋混凝土柱的变形性能

为研究地震作用下弯剪破坏钢筋混凝土(RC)柱的变形性能,对24根不同剪跨比、轴压比及配箍率的RC柱进行了低周反复试验.分析了剪跨比、轴压比和配箍率对柱滞回曲线、骨架曲线及变形能力的影响,研究了RC柱的地震破坏模式以及不同破坏模式下柱的弯曲位移、剪切位移及滑移位移在总水平位移中所占比例和变化规律.结果表明,反复荷载下RC柱会发生弯曲、剪切及弯剪3种典型破坏.当剪跨比较小、轴压比较大且配箍率较小时,RC柱易发生弯剪破坏或剪切破坏,试件的耗能能力和延性较差,表现为滞回环面积和极限位移较小.当RC柱发生弯剪或剪切破坏时,弯曲位移在总水平位移中所占比例较小,剪切位移所占比例较大,钢筋拔出产生的滑移位移所占比例约为30%~40%.     

Orbit determination of Chang＇E-3 and positioning of the lander and the rover

Chang＇E-3 landed on the east of Sinus Iridum area on December 14, 2013, performing China＇s first successful soft landing on the lunar surface. We present the results on precision orbit determination and positioning of the lander and the rover. We and methods used to achieve period December 2-21, 2014. describe the data, modeling, position knowledge over the In addition to the radiometric X-band range and Doppler tracking data, delta differential one-way ranging data are also used in the calculation, which show that they strongly improve the accuracy of the orbit reconstruction. Total position overlap differences are about 20 and 30m for the 100km × 100km and 100 kmx 15 km lunar orbit, respectively, increased by ,- 50 % with respect to CE-2 and at the same level as other lunar spacecrafts of recent era such as SELENE and lunar reconnaissance orbiter （LRO）. The position error of the soft landing trajectory is less than 100 m. A kinematic statistical method is applied to determine the position of the lander and relative position of the rover with respect to the lander. The position difference of the lander is better than 50 m compared to LRO photograph result. Compared with the delta very long baseline interferometry （VLBI） group delay between the lander and the rover, the delta VLBI phase delay can improve the relative position of the rover from ～ 1,000 to ～1 m.     

600MW机组真空系统异常分析及治理

本文分析了佛山恒益发电有限公司2×600MW超临界汽轮机凝汽器真空低的原因,制定了整改措施,进行了全面氦质谱仪查漏、漏点处理及真空系统优化治理,目前真空系统运行稳定,提高了机组的经济性和安全性,对于其它机组真空异常具有一定的参考价值。     

邻株低磷竞争处理对杉木幼苗生长的影响

以南方林区广泛种植杉木无性系为研究对象,利用室内沙培模拟装置,设置缺磷(0 mg/kg KH2PO4)、低磷(6 mg/kg KH2PO4)和正常供磷(12 mg/kg KH2PO4)3个供磷水平,构建邻株磷竞争环境.结果表明:邻株低磷竞争处理可明显促进杉木苗高生长,但竞争条件下,缺磷处理抑制杉木苗高生长.不同邻株磷竞争处理条件下杉木地径生长差异未达显著水平.在邻株低磷竞争处理条件下杉木根系长度、表面积、直径、体积等形态指标增量最大.     

水平井在姬塬油田铁平7井区的应用效果研究

鄂尔多斯盆地伊陕斜坡西南部的铁平7井区油藏属于典型的底水发育的低渗透岩性—构造油藏,油藏具有油层厚度较薄,物性较差,单井产能较低的特点.通过对水平井与直井的应用效果分析对比后得出:水平井可以解决边底水突进过快的问题,并可增大泄油面积,提高单井产量,从而显著提高低渗透油藏产能,增加经济效益.     

表面活性剂驱在吴仓堡油区的应用与效果分析

针对常规水驱后大量残余油无法被采出的问题,吴仓堡油区实施了表面活性剂驱矿场试验。表面活性剂注入浓度为0.5%,确定注入总量为0.3PV,根据矿场参数确定了长2、长6、长9层位最大注入压力。试验结果表明,表面活性剂驱有效抑制了单井产量递减,单井日产油量提高,平均单井日产油量由1.36t上升至1.55t,表面活性剂使油水两相相对渗透率均得到提高,试验区注入压力下降0.4MPa。表面活性剂驱的应用对吴仓堡低渗透油区提高采收率具有重要的实际指导意义。     

陶瓷膜处理低温低浊水反冲洗参数的优化研究

以孔径200 nm的Al2O3陶瓷膜错流过滤处理松花江低温低浊水,运用最优化设计计算得到反冲洗周期理论最优值94.8 s,开展正交实验确定跨膜压差(TMP)及反冲洗压力影响显著,反冲洗时间影响不显著,确定跨膜压差0.2 MPa,反冲洗压力0.5 MPa,反冲洗时间4 s为适宜。     

自然电场法与激电法在找矿中的应用

本文探讨了都兰县诺木洪乡金水口一带石墨矿普查激电法和自电法应用效果,为昆仑山地区同类型矿床提供借鉴。本区先后进行了自然电位扫面和大功率激电中梯扫面工作,找矿标志为电位负异常、低阻高极化特征。自电和激电异常十分明显,并且与已知石墨矿化点吻合很好,在部分覆盖区也产生了强烈的激电异常。地质测量及地表工程表明,异常对找矿起到了直接指导作用。通过两种方法的相互验证、相互补充,大致确定了矿(化)体的形态、规模、及深部延深情况,取得了良好的应用效果。     

既有朝阳嘉陵江大桥接触网悬挂安装研究

既有非电化铁路电气化扩能改造是当下中国铁路建设的重要方向。既有铁路桥上接触网悬挂安装设计是既有铁路电气化改造的重要一环,本文针对重庆枢纽既有朝阳嘉陵江大桥开展了接触网特殊悬挂安装研究,为国家重点建设项目节省了投资,缩短了建设工期。     

A high-level synthesis based dual-module redundancy with multi-residue detection （DMR-MRD） fault-tolerant method for on-board processing satellite communication systems

On board processing （OBP） satellite systems have obtained more and more attentions in recent years because of their high efficiency and performance.However,the OBP transponders are very sensitive to the high energy particles in the space radiation environments.Single event upset （SEU） is one of the major radiation effects,which influences the satellite reliability greatly.Triple modular redundancy （TMR） is a classic and efficient method to mask SEUs.However,TMR uses three identical modules and a comparison logic,the circuit size becomes unacceptable,especially in the resource limited environments such as OBP systems.Considering that,a new SEU-tolerant method based on residue code and high-level synthesis （HLS） is proposed,and the new method is applied to FIR filters,which are typical structures in the OBP systems.The simulation results show that,for an applicable HLS scheduling scheme,area reduction can be reduced by 48.26％ compared to TMR,while fault missing rate is 0.15％.