大跨度预应力框架梁应力测试技术研究

应力监测是预应力结构施工监控中的重要部分,结合工程实例介绍了基于混凝土应变测试预应力测试技术,对弥补预应力结构设计中误差,保证施工质量具有重要意义.     

生存的荒诞——戈尔丁《蝇王》的存在主义解读

英国诺贝尔文学奖获得者威廉·戈尔丁的代表作《蝇王》从存在主义视角对人类生存的荒诞进行了思考,本文试从《蝇王》对人类生存环境的荒诞和人与人存在关系的荒谬来分析它的存在主义特质。     

钢架构拆除技术方案探讨

通过对长岭220 kV变电站的母线改造安装工程的调研,同时通过对AIS与GIS变电站所用设备的分析对比,阐述了改建工程中旧架构与设备拆除的重点和难点。     

系数比例自适应算法的研究

系数比例自适应算法是利用系统的稀疏特性而发展起来的一种新的算法。这类算法为每一个滤波器系数引入一个成比例步长参数,使得成比例步长参数与滤波器系数的估计值成正比,保证了大系数获得大步长,缩短了算法的收敛时间。该文首先介绍了系数比例自适应算法的研究背景及研究现状,然后详细描述了典型的系数比例归一化最小均方(PNLMS)算法,最后重点介绍几种改进的PNLMS算法。     

材料成形技术基础双语教学的教改实践

针对地方本科院校的材料成形技术基础双语教学的现状,本文总结了笔者承担双语教学任务中进行教学改革的一些经验和体会,并着重对双语教材、网络平台和教学措施进行了分析和讨论。     

Pre-processing for time domain image formation in SS-BSAR system

A pre-processing procedure is designed for a space-surface bistatic synthetic aperture radar (SS-BSAR) system when a time domain image formation algorithm is employed. Three crucial technical issues relating to the procedure are fully discussed. Firstly, unlike image formation algorithms operating in the frequency domain, a time domain algorithm requires the accurate global navigation satellite system (GNSS) time and position. This paper proposes acquisition of this information using a time-and-spatial transfer with precise ephemeris and interpolation. Secondly, synchronization errors and compensation methods in SS-BSAR are analyzed. Finally, taking the non-ideal factors in the echo and the compatibility of image formation algorithms into account, a matched filter based on the minimum delay is constructed. Experimental result using real data suggest the pre-processing is functioning properly.     

An approach for user’s trajectory prediction based on the trajectory cluster

The existing user’s trajectory prediction methods considered little about the interrelation among users and would fail if the user historical trajectory data were lack. This paper presents a user’s trajectory prediction model and corresponding algorithms by the historical trajectories of users based on the trajectory cluster. The experimental results on MDC dataset show that the proposed method has great improvement in efficiency, accuracy, and scalability comparing with the traditional methods, and it also be applied to the situation where user’s historical trajectory data are lacked.     

浅析水泥混凝土路面早期断板原因及防治

文章结合笔者参加检查验收的几条滑模施工和小型机具施工的混凝土路面发现有早期开裂断板,分析其成因并提出防治对策.     

高效液相色谱法同时测定树鼩脑组织中的去甲肾上腺素,多巴胺,5-羟色胺及色氨酸

应用高效液相色谱(HPLC)--荧光检测,在一根带有预柱的LKB Superpac ODSC_(18)钢柱上,使用离子对系统做为洗脱液,对一组正常活动规律的树鼩脑组织液中的去甲肾上腺素(NE)、多巴胺(DA)、5-羟色胺(5-HT)及色氨酸(TRP)进行测定。荧光检测的波长为激发波长280nm,发射波长360nm得到各物质最小检测限量为:40ng NE和80ngDA(信噪比3:1)以及10ng5-HT和15ng TRP(信噪比4:1)。此方法具有实验操作简单、方便、快速、灵敏度较高、样品易于处理等特点。     

溴代双酚A型不饱和聚酯树脂的阻燃机理

利用TGA、DSC、热解-电导率仪,研究了文题内容。实验结果说明了溴的引入,使树脂具有良好的阻燃性,当溴含量大于7.63%(wt)时,树脂即能自熄。溴使树脂热解过程成碳倾向增加,分解生成的溴化氢是有效的自由基捕获剂。三氧化二锑和溴同时引入,对阻燃具有协同效应。