高效预应力混凝土叠合框架受力性能试验研究及与钢筋混凝土叠合框架对比分析

本文介绍了两棍高效预应力混凝土（ＨＰＣ）叠合框架模型试验（１：３）的试验结果，并与承载力及配筋指数相当的混凝土（ＲＣ）叠合框架模型试验（１：３）的试验结果进行了对比。分析了ＨＰＣ模合框架的受力性能、应变变形特征、裂缝特点和二次受力特征系数。提出了作用于预制构件内力的整体作用系数ａ的概念。     

The inertial technology based 3-dimensional information measurement system for underground pipeline

Underground pipeline industry is developing at a very high speed and it is playing an increasingly important role in modem world. However, how to make a precise 3-dimensional survey of underground pipelines becomes a focused issue. Current survey methods have several disadvantages, such as limited depth, sensitivity to electrical-magnetic disturbances, low generality and poor manipulability. Inertial technology is an autonomic, anti-disturbance and high accurate positioning method which has been widely used in navigation systems. An inertial technology based underground pipeline survey system is designed in this paper. Firstly, basic principles including 3-dimensional dead reckoning, pitch and yaw angle measurement and a special survey procedure are introduced. Secondly, the system is structured and its software is designed. Thirdly, several multi-information fusion methods are used to eliminate certain sensors’ disadvantages and promote the system’s precision. Finally, a series of field tests are introduced to verify the system.     

红外探测技术在圆梁山隧道突水预报中的应用

隧道突水是隧道工程中的主要地质问题，是隧道施工中的安全隐患，突水危险地段的超前预报是安全施工的保证。阐述了红外探测仪的基本工作原理和HY-303红外探测仪在圆梁山隧道突水超前预报中的应用前景。圆梁山隧道进口段平导和正洞的红外突水预报结果证明，红外探测仪对透水区域的超前预报是准确的，值得在复杂地质条件下隧道工程实践中推广。     

EMS电子测斜仪在深井水平井大斜度段及水平段的应用

利用EMS电子测斜仪的多点工作方式及自身可打捞的功能 ,代替有线随钻或无线随钻测斜仪对井眼轨迹 ,尤其是深井水平井大斜度段及水平段进行监测 ,解决了仪器缺乏的问题 ,大幅度降低了钻井成本。     

Transcrystalline formation and properties of polypropylene on the surface of ramie fiber as induced by shear or dopamine modification

The key for fiber reinforced polymer composites is the interfacial interaction between fiber and polymer matrix. The crystallization of polymer on the surface of fiber as a possible way to enhance the interfacial interaction has received increasingly attention. In this work, the transcrystalline (TC) formation and properties of isotactic polypropylene (iPP) on ramie fiber surface, as induced either by fiber pulling or by dopamine modification, were investigated and compared. It was found that the growth rate of shear induced TC is faster than that obtained via dopamine modification. There exists α–β crystal form transition in the TC formation process as induced by pulling while only α-crystal form is obtained via dopamine modification. By using both dopamine modification and fiber pulling, a formation of TC with two step growth was observed for the first time: the first step growth has much enhanced rate than that induced by fiber pulling, and second step growth has the same rate with that induced by dopamine modification. Thus a unique TC structure was obtained, with α-crystal form presented in the inner layer and the outer layer, and β-crystal form in between. The result from single fiber fragmentation test indicated that interfacial shear stress (IFSS) between iPP and ramie fiber for dopamine modification induced TC is much higher than that of shear induced TC. Our work provides guidance for the preparation of polymer/fiber composites with enhanced interfacial interaction via formation of TC layer by using shear or fiber surface modification.     

一种气调保鲜箱模糊控制器的设计

讨论了气调保鲜箱的技术特点,给出其系统组成,并介绍了应用模糊控制技术实现气调保鲜箱温度、湿度、O2浓度控制的设计方法。通过实际运行,在静止气调保鲜库中可以达到满意的保鲜效果。     

无线Mesh网络技术研究

无线Mesh网络是无线局域网和移动自组织网络相结合的产物,是一种无线多跳网状拓扑网络,具有很大的应用前景.阐述了无线Mesh网络的通信结构和特点,对该技术的实现方式和常用协议进行了对比分析,并对其应用领域进行了介绍.     

基于Silverlight的赤潮监测WebGIS技术研究与应用

以赤潮综合监控预警服务系统为背景,在解析数据通信、图层结构等关键技术的基础上,给出系统的总体结构和框架设计,并研究WebGIS在赤潮上应用。重点介绍RIA技术与Spring框架结合实现的WebGIS系统,并针对GIS相关实现中的关键问题,给出行之有效的解决方案。Silverlight的应用增强了地图应用的表现力并使GIS工程与Spring功能分离开发。通过嵌入结构在Spring实现整合,系统耦合性低、可移植性强。