Design and passive analysis of a novel softness display device

Simulating the softness property of object is quite a challenge in virtual reality system. A novel softness display system was developed based on the principle of deformable length of elastic element control （DLEEC）. In the system, the equivalent stiffness of the device is adjustable, and is inversely proportional to the third power of the deformable length of elastic beam. PD position control is employed to guarantee the accurate softness display. The softness of the virtual objects in large scale can be felt with the softness display device. Compared with other haptic devices, the device is passive and exert the react force only when the operator ＂actively touch＂ the virtual objects. The stability of the softness display system was analyzed. It was theoretical proved that the system satisfied the criteria of wide impedance range ＂Z-width＂, and the performance was superior to an active system. The experimental results were presented.     

HM抗磨液压油添加剂的复合效应

对HM抗磨液压油组成中各种添加剂的复合效应进行了探讨,并对国产添加剂和进口添加剂进行了对比分析,为抗磨液压油复合添加剂的研制和生产提供了可靠依据。     

c ++起长浮点类的设计及π 的精确计算

文中利用C 面向对象的编程技术，设计并实现了不受计算机位数和软件数据类型限制的，可以完成任意位数的浮点数存储，运算和输入输出的超长浮点类，并据此提出了基于级数的，对圆周率π和自然对数的底e精确到小数点后任意位的计算方法。     

血液的光学性质研究

本文用辐射输运理论方法去计算红细胞的光学特征量,并在此基础上提出检测血细胞数密度的理论实验方案,其结果与传统的方法一致。本文为开发一种血球数自动检测仪提供了理论基础和仪器结构原型。     

数字式八脉冲触发器

本文介绍了自行研制的数字式八脉冲触发器．该触发器运行可靠，抗干扰能力强，性能、价格比高，在电力电子技术的应用中有一定的推广价值     

区域资源空间分配的数学原理

文章根据经济学的择扰分配原理和区域经济地理学的区划思想，提出资源在地域空间上合理配置的数学规划方法，并指出了应用此方法的有关问题及解决办法。在探讨方法论的同时，文章也得出如下结论：资源的空间分配法则不是域均衡，而是边际收益的空间统一。     

关于近代物理实验教学的思考

本文从教学模式、教学方法、开放实验、专题讲座几方面提出了关于提高近代物理实验教学质量的一些设想。     

Functional magnetic resonance imaging of amphetamine craving

The aim of this study is to identify the brain activity associated with amphetamine craving for understanding the neurobiology of addiction by watching pictures of happy, sad or amphetamine. Brain activity was measured in 12 amphetamine addicts and 12 healthy subjects by fMRI while the subjects watched pictures designed to elicit happy feelings, sad feelings, or the desire to use amphetamine. The result demonstrated that amphetamine cues led to abnormally high cingulate and low frontal lobe activation in amphetamine addicts, who showed abnormalities in affect-related brain activation.