折弯辅助机器人的设计及动力学仿真

从自动化折弯工艺出发,设计了B20型六轴直角坐标折弯机器人整机结构,并在多体动力学分析软件中对系统进行建模,完成了运动学仿真,获得了Y、Z、A轴的速度、加速度曲线,为具体的结构设计和运动控制提供依据。     

无碱液态水泥速凝剂的性能及其促凝机理

采用无机-有机复合的方法在试验室成功合成无碱液态速凝剂(简称NSA速凝剂),并系统地研究了该速凝剂的添加对水泥凝结时间及强度发展的影响。此外,文中还分析了NSA速凝剂对水泥的促凝机理。     

低水灰比条件下水泥砂浆的抗硫酸盐侵蚀性能

硫酸盐侵蚀是混凝土耐久性研究的重要组成部分,被认为是引起混凝土材料失效破坏的主要因素之一。研究了低水灰比条件下掺有超细矿渣粉的水泥砂浆在不同种类和浓度的硫酸盐溶液中浸泡后的力学性能变化,同时,对侵蚀试样的孔结构进行了分析。试验结果表明:与普通水灰比相比,低水灰比条件下水泥砂浆的抗硫酸盐侵蚀性能改善更加显著;超细矿渣粉的引入不仅可以增加水泥砂浆的强度,而且可以改善其抗硫酸盐侵蚀性能;同时,矿渣粉掺加改变了水泥硬化体的孔隙率,水泥硬化体趋于致密化。     

遥感信息元数据集成服务系统的研究与实现

在SOA框架下研究遥感信息资源元数据的集成涉及的关键技术。系统中数据源以服务的方式动态接入,并通过一个中间代理层对外提供统一的服务;系统将W eb服务技术与联邦模式技术进行有机地结合,实现了异构遥感元数据的集成,支撑遥感数据的跨域共享。试用结果表明,系统完全达到了设计目标,效果良好。     

油田井站单井自动计量系统研究

数字化油田的基本问题之一是建立安全可靠规范的油田井站单井自动计量系统。文章给出了数字化油田的三个基本内涵,结合纯梁采油厂48号井站,设计了油田井站单井自动计量系统。针对井站各井流量范围大小差别很大的特点,开发了复合流量计量技术。按照对单井数据进行综合利用的要求,基于 OPC 协议和 Visual Baisc 语言,开发了单井数据库。该系统投运以来,运行状态良好,达到了设计要求。     

Diffusion characteristic of sulfate anion in surface region of cement mortar at early stage

The SO_4~(2-)concentration distributions in surface region of cement mortar immersed in sulfate solution at early stage were measured by layered sampling method combined with chemical analysis, and the diffusion coefficients of SO_4~(2-)anions in surface region of mortar into internal area were calculated by means of instantaneous plane diffusion theory. The experimental results showed that the SO_4~(2-)concentration gradually reduced when the diffusion depth increased in the surface region of mortar. Diffusion coefficient(D) was relevant with the concentration and kind of environmental sulfate solution, which reduced with immersion time at the beginning, and then rose slowly after a period of time. The calculation of initial diffusion coefficient(D_0) and starting time of deterioration(t_∞) caused by sulfate attack was further attempted based on the data of diffusion coefficient, and it was found that D_0 and t∞ were all relevant with concentrations of sulfate and different kind of sulfate as well.     

Solidification/Stabilization of Zinc-lead Tailings by Alkali Activated Slag Cement

An appropriate proportion of alkali activated slag cement, abbreviated as AASC later, was determined based on strength test of paste specimens. Results showed that AASC prepared from 14% low modulus water glass and blast furnace slag presented its compressive strength of hardened cement paste of 69.6, 84.0 and 91.8 MPa at 3, 7, and 28 d curing ages respectively. Flowability of the fresh tailings-cement pastes and the strength development of hardened tailings-cement paste were also tested both in the cases with addition of AASC and Portland cement. The fresh tailings-cement paste added with AASC presented much better flowability and the corresponding hardened paste presented higher compressive strength, especially the long term strength, than those added with Portland cement. Therefore, tailings paste added with AASC allowed lager solid content than that of Portland cement in order to keep the similar flowability. SEM observation on the microstructure of the hardened tailings-AASC mixture pastes showed obvious cementation effect. MIP measurements also showed that the total porosity of the hardened tailings-cement pastes decreased, and the portion of larger pore also decreased when the dosage of AASC increased. It is believed that AASC is more suitable to be used as a binder for the stabilization of zinc-lead tailings and for its backfilling operation than Portland cement.     

几种化学物质对粉煤灰水泥活性激发效果

借助于水泥砂浆试样的抗压强度跟踪测试,考察了几种无机化学物质对粉煤灰水泥的活性激发效果,同时借助于对水泥硬化体样品的XRD测试和SEM观察,深入通探讨了添加激发剂的粉煤灰水泥硬化体的水化产物和微观结构特征。试验结果表明:激发剂显著促进了粉煤灰水泥的活性激发,尤其是早期活性,水泥强度显著提高;XRD测试和SEM观察也表明,与空白样品相比,掺加激发剂的粉煤灰水泥硬化体明显表现出致密化的结构特征,粉煤灰颗粒表面趋向于粗糙化;Ca(OH)2衍射峰和石英衍射峰明显减弱,表明在激发剂作用下粉煤灰中的活性成分与水泥水化放出的Ca(OH)2之间化学反应得到了加剧。     

硫酸盐环境下水泥砂浆的腐蚀产物及孔结构研究

采用激光拉曼光谱和压汞法研究了硫酸盐环境下水泥砂浆的腐蚀产物及孔结构,并引入分形维数,建立了水泥砂浆的抗折强度与平均孔径和分形维数的关系。结果表明：不同浓度的Na2SO4溶液浸泡下,砂浆表层腐蚀产物有所不同,且腐蚀产物在砂浆表层分布是不均匀的;砂浆的抗折强度与平均孔径r成反比,与分形维数d成正比,通过三种公式拟合可知,d/r2和抗折强度具有较好的相关性。     

碱-矿渣水泥缓凝物质的选择研究

研究了氯化钡、硝酸钡、硫酸铁、铬酸钠、氯化镁、硫酸镁、硫酸铝等无机盐以及酒石酸、草酸等有机酸对碱-矿渣水泥凝结时间的影响.试验结果表明,氯化钡、硝酸钡、氯化镁、硫酸铝、酒石酸有良好的缓凝作用,硫酸铁、铬酸钠、硫酸镁、草酸不产生缓凝作用.通过强度测试发现,氯化钡、硝酸钡、氯化镁、硫酸铝、酒石酸均对碱-矿渣水泥的强度有一定的不良影响.