500kV架空线路地线防振锤滑移分析及结构改造

本文通过对地线防振锤的结构、材料、运行环境及受力特点的分析,找出了地线防振锤滑移的影响因素.针对影响因素提出了4种防滑移方案,并比较得出了最佳方案为金属内套式防振锤.利用ANSYS13.0 Workbench软件对其模型进行有限元接触分析,验证了防滑移方案的有效性.     

城市地震避难所规划研究——以保定市为例

随着城市现代化进程加快,人们生活水平质量的提高,城市整体防震减灾功能远远滞后于城市发展的脚步.基于当前保定市区地震避难所规划情况,分析保定市现有应急避难场所存在的一些问题,提出健全相关加强城市应急避难场所建设的对策建议,实例分析学校及城市公园地震避难所的基本情况,并针对其不足提出相应的规划建议.同时,以问卷形式调查保定市民对地震避难所了解情况,并宣传地震避难所相关知识信息.     

基于概率分析法和可靠度评估法的基桩检测合格率分析

研究了基桩合格率的概率分布,并基于此提出概率分析法和可靠度评估法两种分析方法,最后通过算例分析充分考虑现有工程数据,使得合格率的确定具有概率统计基础,对实际工程提供指导和理论依据。     

Directional Analysis of the Chaotic Superlattice around the Equilibrium Point in the Phase Space

The recently proposed method of our research group named as directional Lyapunov exponents(DLEs) is presented. Then, DLEs are used to analyze the eigenstructure of the output phase space around the equilibrium points. Finally, the impacts of the superlattice parameter changes on the characteristics of the output chaotic signal are analyzed. The experimental results show that parameter changes of the superlattice will affect the eigenstructure around the equilibrium points in the output phase space, and DLEs are sensitive to these changes.     

Analysis of total nitrogen and total phosphorus in soil using laser-induced breakdown spectroscopy

Laser-induced breakdown spectroscopy(LIBS) is used to determine the total nitrogen(TN) and total phosphorus(TP) in soil.Quantitative determinations are conducted using the line intensity of the analyte element and element concentration.Calibration models are obtained using ten samples for TN and seven samples for TP.The rest samples are used to validate the results.Strong linear correlations are obtained from the determined TN and TP concentrations.LIBS is a powerful tool for analyzing soil samples to determine nutrient elements by selecting calibration and validation samples with similar matrix composition.     

QBSO算法在PID参数优化的应用

为解决PID控制参数求解过程中所存在的求解精度不高的问题,提出一种量子天牛群算法.通过结合PSO算法的全局搜索能力、BAS算法的局部搜索能力以及量子策略的随机能力,使得算法的全局搜索能力以及搜索精度得到有效提高,并通过两类经典函数对其寻优能力进行验证.进一步,将QBSO算法应用于PID参数优化中,并对一阶与二阶延时和非延时系统进行PID控制参数求解.通过仿真实验以及计算结果表明,基于QBSO的PID控制的控制系统具有更加优良的动态性能与抗扰动能力.     

强拟诣零clean环（英文）

环R中元素a称为强拟诣零clean元,若存在幂等元e∈R和拟幂零元q∈R使得eq=qe且a=e+q;称环R为强拟诣零clean环,如果R中每一个元素均是强拟诣零clean元.强拟诣零clean环介于强诣零clean环和强clean环之间,并且每一个强拟诣零clean元是强clean元.本文介绍了强拟诣零clean环的基本性质和结构,并研究了局部环R上广义矩阵环K_s(R)的强拟诣零clean性.     

Monolithic integration of an AlGaN/GaN metalinsulator field-effect transistor with an ultra-low voltage-drop diode for self-protection

In this paper,we present a monolithic integration of a self-protected AlGaN/GaN metal-insulator field-effect transistor(MISFET).An integrated field-controlled diode on the drain side of the AlGaN/GaN MISFET features a selfprotected function for a reverse bias.This diode takes advantage of the recessed-barrier enhancement-mode technique to realize an ultra-low voltage drop and a low turn-ON voltage.In the smart monolithic integration,this integrated diode can block a reverse bias(> 70 V/μm) and suppress the leakage current(< 5 × 10-11 A/mm).Compared with conventional monolithic integration,the numerical results show that the MISFET integrated with a field-controlled diode leads to a good performance for smart power integration.And the power loss is lower than 50% in conduction without forward current degeneration.     

唐氏综合症听力障碍儿童言语康复训练的个案研究

通过对一名唐氏综合症听力障碍儿童进行听力语言康复的个案研究,探讨对多重残疾儿童进行康复训练的方法和意义。研究过程采用情境一对一教学法进行康复训练,发现儿童的言语发展迅速。因此,针对唐氏综合症听力障碍儿童,情境一对一教学法可有效促进儿童的言语发展。