Chemical synthesis of SmCo_5/Co magnetic nanocomposites

A three-step chemical synthesis of SmCo_5/Co nanocomposites was developed. Firstly, the Co-Sm(OH)_3-Ca(OH)_2 precursors were prepared by co-precipitation.Secondly, SmCo_5 particles were obtained by reductive annealing of the precursors. At last, the SmCo_5/Co nanocomposites were achieved by chemical deposition based on SmCo_5 particles. The SmCo_5/Co nanocomposites contain hard magnetic phase of SmCo_5 with about 100 nm in size and soft magnetic phase of Co with about 8 nm in size,exhibiting independent two-phase structure without alloying. Compared to that of single-phase SmCo_5 particles, the saturation magnetization of SmCo_5/Co nanocomposites is increased by 27.5%. The synthesis provides a new route to fabricate SmCo-based nanocomposites.     

Protein A Detection Based on Quantum Dots-Antibody Bioprobe Using Fluorescence Coupled Capillary Electrophoresis

In this report, fluorescence detection coupled capillary electrophoresis (CE-FL) was used to detect Protein A. Antibody was first labeled with Cy5 and then mixed with quantum dots (QDs) to form QDs-antibody bioprobe. Further, we observed fluorescence resonance energy transfer (FRET) from QDs donor to Cy5 acceptor. The bioprobe was formed and brought QDs and Cy5 close enough to allow FRET to occur. After adding protein A, the FRET system was broken and caused the FRET signal to decrease. Thus, a new method for the determination of protein A was proposed based on the FRET signal changes. This study provides a new trail of thought for the detection of protein.     

Quench Sensitivity of AA7N01 Alloy Used for High-Speed Train Body Structure

JOM - The quench sensitivity of AA7N01 aluminum alloy used for high-speed train body structure was investigated by end-quenching test, time–temperature-transformation curves simulation,...     

对高压输电线路工程施工监理若干问题的思考

随着高压输电线路工程建设规模日益扩大,对工程监理能力的要求也日益提高。笔者结合自身多年的工作实践,提出了高压输电线路施工过程中经常面对的问题,提出了做好监理工作的一些措施。     

基于欠驱动原理的5指残疾人假手设计

采用欠驱动自适应原理设计了与成年人手大小相仿的5指残疾人假手,所设计的假手结构简单,质量轻,适应性强。假手主控制器采用TMS320F2810来实现对传感器信号的采集,步进电机的控制。并利用所设计假手进行了多种抓握实验,表明该假手可对多种形状物体进行抓、握、捏等多种操作。     

基于CPSO滚动优化的堆芯功率自适应预测控制

针对核反应堆变功率过程中系统的非线性和反应性增量约束问题,本文将具备模型参数自适应辨识能力的改进型广义预测控制器(JGPC)应用于堆芯功率控制,该控制器通过预测模型参数和递推关系计算未来时刻的预测输出值,同时采用经正弦混沌策略和非线性惯性权重改进的混沌粒子群算法(CPSO)进行滚动优化,在优化过程中通过设定优化边界和混沌策略来处理反应性约束;以堆芯功率的受控自回归积分滑动平均模型(CARIMA)作为预测模型,并采用遗忘因子递推最小二乘法(FFRLS)自适应辨识模型参数,以克服堆芯功率模型非线性。基于MATLAB平台对本文控制器进行仿真验证,结果表明,该控制器在满足约束条件的情况下,能使堆芯功率快速、稳定地跟随设定值,且具备一定的抗干扰能力。     

基于时间序列神经网络的蒸汽发生器传热管泄漏程度诊断研究

针对蒸汽发生器U形传热管泄漏,本文提出了一种基于时间序列神经网络对蒸汽发生器传热管泄漏程度进行诊断研究的方法。首先,对核电厂蒸汽发生器U型传热管泄漏进行机理分析,构建其数学模型,提取其泄漏的直接特征参数,再依据Fisher得分法,提取其间接特征参数;其次,通过滑动时间窗口法从预处理后的时间序列数据中生成数据样本,作为时间序列神经网络的输入,并以蒸汽发生器U形传热管泄漏程度信息为标注,基于反向传播(BP)算法对五层神经网络系统进行训练,得到蒸汽发生器U形传热管泄漏的时间序列神经网络模型;最后,模拟核电厂运行过程蒸汽发生器U形传热管泄漏时的时间序列测试数据。仿真结果表明,时间序列神经网络对演变事件的处理具有较好的有效性和较高的泛化能力,对故障程度的诊断研究具有参考价值。     

Numerical analysis of a ventilated supercavity under periodic motion of the cavitator

This paper presents a numerical simulation of the geometry and the pressure distribution of a ventilated supercavity at different cavitator amplitudes and perio...     

广深沿江高速公路(深圳段)混凝土结构耐久性设计方案

介绍广深沿江高速公路(深圳段)耐久性设计的初步方案。该方案以提高海工混凝土自身防腐性能、合理选取保护层厚度为基本措施,同时根据使用环境和结构部位选取必要的防腐附加措施。     

异形结构施工总承包项目中智慧建造技术的综合应用—景德镇御窑博物馆项目

智慧建造的特点就在于依靠IT技术、云技术、新型建造设备等传统建造不具备的资源,达到减少重复性人力劳动的目的,使建造过程处于智能技术的精准控制下,解决了人力难以甚至无法达到的高效建造模式。在位于江西省景德镇市的景德镇御窑博物馆项目中,中建一局团队利用了无人机、Hololens全息眼镜、智能放样机器人以及三维激光扫描仪等智能建造设备,整合出了一套质量控制全过程全过程质量控制的解决方案。