周铣加工表面形貌仿真新算法

考虑主轴偏心，基于周铣过程中刀具切削刃上任意点与工件相对运动的轨迹方程和周铣过程几何特征，构造出可以求解周铣加工表面上任意一点形貌高度值的三维表面形貌仿真算法，并给出了相应的仿真算例。该算法无需对刀齿进行微段离散，并且不依赖于工件网格划分，加工表面上任意一点形貌高度值的计算次数等于刀具齿数，具有通用性好、运算速度快、结果准确度高的特点。     

基于C/S的工程设计智能化信息系统设计

本文探讨了工程设计流程智能化管理，指出了建立工程项目设计流程管理模型的方法，以及系统的详细分析与设计。     

锰硅合金冶炼渣型的研究与控制

简要论述了锰硅合金冶炼的渣型特征及其控制方法。     

Effect of Rare Earths on Corrosion Resisting Properties of Carbon-Manganese Clean Steels

Rareearthelementshavesignificantactionsinsteels ,includingwipingoffimpurityelements ,trans modifyinginclusions ,andimprovingmicrostructureetal,soaddingappropriaterareearthsintosteelscanef fectivelyimprovetheircorrosionresistingproper ties[1,2 ] .Todaypuri…     

汽油在线优化调合系统实践

为了保证汽油调合辛烷值的准确性,在减少辛烷值浪费的同时应避免因辛烷值低于标准值而造成质量事故。参考国内外汽油在线优化调合的各种技术方案,设计了一种适合中国国情的汽油在线优化调合控制系统。经中石化天津和洛阳炼油厂应用证明,系统很好地解决了调合过程中的辛烷值控制及优化问题,取得了较好的经济效益。     

Modeling and analysis of workpiece stability based on the linear programming method

After being located on a machine bed, a workpiece will be subject to gravity and cutting forces during the machining operation. In order to keep the locating precision as well as the production safety, it is necessary to maintain the workpiece stability. In this paper, a linear programming method is proposed for stability analysis of the workpiece. Based on the linear approximation of the friction cone, a quantitative criterion is established to verify the workpiece stability in association with the rationality of the clamping sequence, magnitude of clamping forces and clamping placement. This criterion allows designers to plan reasonably the clamping sequence, magnitude of clamping forces as well as clamping placement. Compared with existing methods, the main advantage of this approach lies in that the sophisticated computing of contact forces between fixture elements and the workpiece is avoided. In this work, both friction and frictionless cases can be easily taken into account in stability analysis. Mathematical formulations of the method are given and some numerical tests are finally demonstrated to validate the proposed method.     

太阳能热水器自动温度控制器设计

介绍了太阳能热水器的自动控制器的功能和组成，阐述了控制系统的工作原理，硬件和软件设计及相关技术问题，实际应用表明该系统可靠性高、操作简单，具有良好的经济和社会效益。     

环境美学视野中的山水城市理念

从阐述宜居城市的内涵出发,提出乐居是宜居的最高境界,并进而在此基础上,透过环境美学的视野,分析了山水城市理念与城市乐居追求的内在关联,指出环境美学试图营造的让人乐居的理想居住环境,实际上与山水城市的理念殊途同归．     

福建连城锰矿在困境中求发展

通过分析近几年制约矿山发展的因素,提出了一系列克服困难的对策,值得多数矿山借鉴。     

双能X线吸收法与近红外法测定脂肪含量的评价

用美国Ｌｕｎａｒ ＤＰＸ－Ｌ骨密度仪和日本ＦＶＴＲＥＸ－１０００型近红外仪对９２例人群进行脂肪含量评价。其中７８例为健康人，男性４３例，女性３５例。测定结果女性平均脂肪含量高于男性，两种方法对全部人群的体脂肪测定结果相关系数ｒ＝０．９２１，本文介绍测定原理并对两种方法的优缺点作了评价。