用于非圆截面车削的动圈电机伺服刀架系统的设计

设计了一种新型的由动圈直线电机驱动可用于可凸变椭圆活塞车削的伺服刀架系统，给出了新型刀架机械系统的数学模型及其闭合控制系统的组成，分析了动圈中温升较高的原因，提出了降低动圈铜损、限制温升的措施。     

Research on Giant Magnetostrictive Actuator for Turning Vibration Control

Magnetostriction is a phenomenon in which a magneti c field is used to produce a change in size of some materials. This property has b een known in elements such as nickel, iron and cobalt. Because the rare-ear th alloy Terfenol-D can offer much larger strains than nickel, iron, cobalt, an d other smart materials such as piezoelectric materials, it is called giant magn etostrictive material. Making use of the giant magnetostrictive material, the gi ant magnetostrictive actuator has higher bandwidth and r...     

Research on the Characters of the Cutting Force in Vibration Cutting Particle Reinforced Metal Matrix Composites SiC_p/Al

In this paper, turning experiments of machining particle reinforced metal matri x composites(PRMMCs) SiC p/Al with PCD tools have been carried out. The cutting force characteristics in ultrasonic vibration turning compared with that in com mon turning were studied. Through the single factor experiments and multiple fac tor orthogonal experiments, the influences of three kinds of cutting conditions such as cutting velocity, amount of feed and cutting depth on cutting force were analyzed in detail. Meanwh...     

山西省城市污水化潜力与途径分析

通过对全省城市污水排放量和处理量的预测，计算出污水资源化的潜力，并结合山西省的实际情况提出了污水回用的主要途径和优先次序，通过和调水工程成本的比较，说明了城市污水回用的经济意义。     

读书机器人机构设计

介绍了一种新型的类人读书机器人,并对该机器人的头部和手臂的机构和工作原理进行了详细说明．该机器人的头部具有3个自由度,能够自动调整头部姿态以获得最佳的文字识别效果,机器人双臂具有6个自由度,能够完成左右两个方向的翻书动作．该机器人可以帮助盲人等有阅读障碍的人阅读书籍．     

Composite leading indicators of underlying inflation for seven EU countries

This paper presents short‐ and long‐term composite leading indicators (CLIs) of underlying inflation for seven EU countries, namely Belgium, Germany, France, Italy, the Netherlands, Sweden and the UK. CLI and CPI reference series are calculated in terms of both growth rates and in deviations from its trend. The composite leading indicators are based on leading basic series, such as sources of inflation, series containing information on inflation expectations and prices of intermediate goods and services. Neftci's decision rule approach has been applied to transfer movements in the CLIs into a measure of the probability of a cyclical turning point, which enables the screening out of false turning point predictions. Finally, CLIs have been used to analyse the international coherence of price cycles. The forecast performance of CLIs of inflation over the past raises hope that this forecast instrument can be useful in predicting future price movements. Copyright © 1999 John Wiley & Sons, Ltd.     

飞机操纵前轮转向模糊控制仿真研究

研究了基于改进免疫遗传算法优化的飞机操纵前轮转向模糊控制方法.针对三点式起落架布局飞机,建立了操纵前轮转向系统的非线性数学模型.采用免疫算法、小生境技术与遗传算法相结合,克服了简单遗传算法的缺陷.将该算法得到的控制器应用于前轮转向系统中,实现了模糊控制器参数的寻优,仿真结果令人满意.     

论化实为虚笔法在古典小说中的运用

为摆脱历史叙述所惯用的全知视角，从而避免使叙事陷入呆板机械和拖沓繁冗的境地，作为最早成熟的叙事作品，《左传》开创了化实为虚的叙述手法。这种叙述技巧是一种虚化和空灵的笔墨，它巧妙地利用限知视角来调节叙述色调，从而使某些情节的叙述达到了化难为易、线索清晰的目的；同时，它还为读者提供了广阔的想象空间。这种导源于《左传》的叙述技巧被古典小说广泛而成功地继承、师法，也得到许多小说评点家的推崇。     

带转角站的平面转弯运行胶带输送机

对一种带转角站的平面转弯运行胶带输送机,从理论上分析了其实现平面转弯的机理及转角站转角滚筒的设计依据,给出了转角滚筒上小托辊安装螺旋线升角与胶带机转弯角与胶带机转弯角度之间的关系,并确定了可转弯的角度范围。     

滑冰速成教学及技术分析

本文依据运动技能形成的基本原理,冰上运动特点及学生学习兴趣和易产生的心理变化,通过滑冰主要动作的技术分析,采用了陆地练习与冰上练习相结合的方法进行教学,有针对性的地设计了教学步聚和练习手段。初上冰时,设计最接近陆地动作的练习手段,而后设计由浅入深的冰上技术动作的练习手段。分层有层的教学,明显地加快了初学者学习滑冰的速度,新旧教法的对比实验进一步说明了这一点。