利用均匀设计试验进行混凝土配合比优化

提出了混凝土配合比试验的均匀设计方法,采用逐步回归法对试验数据进行回归拟合,以经济成本为目标函数,利用目标规划的方法进行混凝土配合比优化．     

一维驱动二维跟踪太阳自动跟踪系统设计

本文从对太阳方位变化规律的分析计算入手,利用天文时间来提供准确可靠的自动跟踪信号,并采用一维驱动实现二维精密跟踪的新技术。依此所设计的新型太阳能聚光器自动跟踪系统与同类产品相比,具有准确可靠、抗干扰能力强、成本低、方便实用等特点;这对于通过聚光方式推动太阳能应用具有重大的现实意义。     

Advances in Soft Materials for Sustainable Electronics

In the current shift from conventional fossil-fuel-based materials to renewable energy,ecofriendly mate-rials have attracted extensive research interest due to ...     

Green revolution in electronic displays expected to ease energy and health crises

The technological revolution of long-awaited energy-saving and vision-friendly displays represented by bistable display technology is conning.Here we discuss methods,challenges,and opportunities for implementing bistable displays in terms of molecular design,device structure,further expansion,and required criteria,hopefully benefiting the light-related community.     

A Method for Automatically Establishing a Mathematical Model of Kinematic Analysis to a Planar Mechanism with a Multiple Joint and Prismatic Pair

A method for automatically establishing a mathematical model of kinematic analysis to a planar mechanism with multiple joint and prismatic pair is presented.The breadth(or depth) first search spanning tree can be obtained based on an adjacency matrix of the mechanism.Then the kinematic chain(or mechanism)’s basic loops can be obtained.On the basis of these basic loops,a mathematical model of kinematic analysis can be established and solved automatically.In the sense of a calculative mechanism,structural analysis of the kinematic chain relates to the kinematic analysis of a mechanism.Thus,an effective way is supplied to the given mechanism’s kinematic analysis for automatic modeling and solving,and a method is supplied to the structural type to optimize kinematic synthesis.     

天然气置换后铸铁管承插接口漏气对策

分析了天然气置换人工煤气后铸铁管道承插接口漏气原理,介绍了4种解决方案:管道更换、PE管内衬、接口修补及燃气加湿,对其进行了技术经济比较。     

18万t/a中高压甲醇合成系统原始开车总结

介绍了18万t/a甲醇合成系统原始开车前的准备工作、开车过程及开车过程中触媒升温还原的注意事项,分析了原始开车过程中出现的主要问题,并介绍了相应的解决方法。     

淋水复合顶板巷道锚梁网支护设计与应用分析

依据巷道顶板岩层形变压力破坏假说,分析了张集矿(北区)东一采区11418(W)首采面淋水复合顶板巷道的承载层、岩层压力及支护载荷,确定了合理的锚梁网支护参数,并成功地应用于现场,取得了比较明显的社会及经济效益,为国内类似条件的巷道支护提供借鉴。     

大型电机滑动轴承的刮研

介绍大型电机滑动轴承刮研的技术要求和方法。     

混合式步进电动机的矢量控制分析

混合式步进电动机与传统的异步、同步电动机相比,由于定子磁势、转子磁钢的非线性分布以及磁饱和等因素的存在而没有简单的线性化数学模型.根据已有数学模型,利用电动机矢量控制原理,在d-q坐标系下推导出混合式步进电动机电磁转矩与电流关系、静态控制与动态控制的数学模型,以及电动机定子电流细分算法,最后通过搭建实验样机验证其控制方法的有效性.