精细陶瓷注射成型工艺现状及发展动态

精细陶瓷注射成技术远比人们起初想象复杂的多，它已不再被人们认为是由塑料工业直接转变而来的技术。本文论述了陶瓷注射成型工艺的关键技术及其发展动态，提出了今后注射民面临的主要问题及需要加强的研究领域。     

宁德核电N1机组化学性能指标管理实践

宁德核电N1机组二回路水质控制,在不同阶段采取相应的控制措施,系统安装阶段设备保养减少腐蚀、调试和启机阶段严格控制二回路冲洗排污、运行期间逐一排查和消除污染源和有效净化二回路水质等关键过程控制,使得二回路水质得到持续优化,N1机组商运首年化学性能指标达到世界先进水平。     

煤制烯烃企业生产装置提高负荷浅析

简要介绍了中煤陕西榆林能源化工有限公司煤制烯烃项目一期的基本情况。分析了影响煤制烯烃企业各主生产装置高负荷运行的因素及提高运行负荷的方法。结合实际生产经验,总结了煤制烯烃企业延长运行周期的措施,确定了煤制烯烃企业最佳的生产负荷,可供同类企业借鉴参考。     

基于Pro/E的单缸发动机运动特性仿真研究

将单缸发动机视为一个由缸体子结构、曲轴子结构、活塞子结构组成的装配体,利用Pro/E分别建立各子结构的三维实体模型,通过对各子结构进行装配实现对单缸发动机的三维建模,利用Pro/E软件的Mechanism模块对整个机构进行运动学分析.     

凹凸棒微珠对废水中孔雀石绿的吸附性能研究

利用喷雾干燥法制备了凹凸棒微珠坯体,并对其进行了煅烧获得凹凸棒多孔微珠。研究了微珠的煅烧温度、用量、吸附时间及染料浓度对废水中孔雀石绿染料的吸附性能。研究表明,凹凸棒微珠为多孔结构,表面存在纤维状组织及褶皱,主要为坡缕石相构成。微珠对废水中孔雀石绿的吸附量随着煅烧温度的增加而先提高(500~700℃)后降低(800~1 000℃),600℃煅烧后的微珠对孔雀石绿的吸附量和去除率分别为95.45mg/g和95.5%;对孔雀石绿的吸附量随着微珠的用量和染料原始浓度的增加而增加,吸附过程可以用伪二级动力学模型来描述。     

被动多传感器自适应曲线模型跟踪新算法

针对被动多传感器机动目标跟踪系统中,由于目标机动性能的不确定以及存在的非线性而导致系统模型与目标实际运动模式难以匹配的问题,提出一种新的自适应曲线模型跟踪算法．该算法通过建立新的方向角模型,设计一种自适应的转弯角速度估计方法,实时计算每个采样时刻目标的切向加速度,以获得与目标实际运动模式相匹配的运动模型,并与扩展卡尔曼滤波相结合,有效提高了被动多传感器下机动目标的跟踪精度．     

Microstructure and strength modification of relaxor ferroelectric ceramics through microwave sintering for multilayer capacitors

Relaxor ferroelectric ceramics with the composition of xPb( Mg_(1/3) Nb_(2/3)O_3-yPb (Zn_(1/3)Nb_(2/3)O_3-zPbTiO_3 was fast sintered in a 2.45 GHz microwave system. Microwave-sintered samples illustrate more rapid densification and much smaller grain size microstructure than eonventional sintered samples. Also the microwave processing significantly increases the dielectric strength and flexural strength of the relaxor so that its strength becomes comparable with modified BaTiO_3, and could obtain comparable dielectric properties in comparison with conventional sintering process. Microwave processing has many advantages for sintering of relaxor ferroelectrie ceramics used as multilayer capacitors.     

Electronic structure of C60 adsorbed on Ag(111) surface and its STM images

The electronic structure of C₆₀ adsorbed on Ag(111) surface have been calculated by using Discrete Variational-Local Density Functional method(DV-LDF).The STM images have been obtained by calculating the charge density distributions of the system,which based on the Tersoff-Hamann theory.The results show that there is 2.32e transfer from Ag cluster surface to C₆₀.The STM images are sensitive to the polarity of external electric field.In the positive bias voltage case,there is three five-membered rings around the topmost in the calculated charge distribution of LUMO and it reflects the symmetry of adsorbed molecular.This means that the tunneling current come mainly from the single bond.However,in the negative bias case,the STM image show that the topmost six-membered ring is highlighted with a center hole just like a doughnut.We find a good agreement between the STM images observed and the calculated charge distributions of HOMO and LUMO.     

溪洛渡水电站坝肩开挖技术

溪洛渡水电站拱坝对拱端边坡有比较明显的影响,在推力作用下,边坡向内有一定的变形。为了减少拱端推力对坝肩槽岩体的破坏,拱坝坝肩开挖难度大,但是要求高。施工中,通过采取调整布孔形式、装药量、优化网络、改进钻孔机械等措施,使坝肩槽开挖各项指标均达到要求。