制备工艺对新型大各向异性压电陶瓷材料性能的影响

通过在钙改性钛酸铅陶瓷材料中添加少量Pb(Zn1/2W1/2)O3、Pb(Ni1/3Nb2/3)O3和MnCO3,研制出了一种既有大机械品质因数又有大各向异性的压电陶瓷新材料,在预烧温度为845－905℃和烧结温度为1130－1190℃的范围内对新材料的微观结构、性能进行了讨论。当预烧温度为860－885℃,烧结温度为1160－1180℃时,样品在压电性能较佳,该材料可用于制作高温高频换能器。     

基于2mm微马达的微型直升机设计与研制

介绍了一种微型直升机的设计与研制过程,该直升机主要由两个直径仅2mm的电磁微马达组成,整体结构设计简单、将微马达作为机身的一个组成部分,分别驱动两个微型旋翼产生升力,使微直升机离地起飞。     

微操作机器人及其显微视觉伺服控制系统的研究

介绍了一种在生物医学工程领域用于完成显微操作的微驱动机器人系统 ,包括其物理结构和逻辑结构。该系统采用基于梯度方差方法恢复显微图像深度信息的显微视觉伺服控制策略以提高该机器人操作精度。目前 ,该机器人系统已成功地完成了人类血液红细胞的分离实验。     

Structure and Magnetic Properties of Y(Fe_(1-x) Co_x)_ (11.3) Nb_(0.7)

ＩｎｒｅｃｅｎｔｙｅａｒｓＴｈＭｎ12 ｔｙｐｅｉｒｏｎ ｒｉｃｈｃｏｍｐｏｕｎｄｓｈａｖｅｂｅｅｎｉｎｔｅｎｓｉｖｅｌｙｉｎｖｅｓｔｉｇａｔｅｄｄｕｅｔｏｔｈｅｉｒｅｘｃｅｌｌｅｎｔｐｅｒｍａｎｅｎｔ ｍａｇｎｅｔｉｃｐｒｏｐｅｒｔｉｅｓ .ＡｌｔｈｏｕｇｈｐｕｒｅｂｉｎａｒｙＲＥ Ｆｅｃｏｍ ｐｏｕｎｄｓｄｏｎｏｔｅｘｉｓｔ,ｔｈｅＴｈＭｎ12 ｓｔｒｕｃｔｕｒｅｃａｎｂｅｓｔａｂｉｌｉｚｅｄｉｎｐｓｅｕｄｏｂｉｎａｒｉｅｓｏｆｔｈｅｔｙｐｅＲＥＦｅ12 -ｘＭｘ,ｗｉｔｈＭ =Ａｌ,Ｔｉ,Ｃｒ ,Ｓｉ ,Ｍｏ ,Ｖ …     

飞行参数主控计算机主机板的测试

计算机系统的主机板是系统的核心 ,往往也是测试的重要项目。本文应用微诊断法 ,实现了对飞参主控计算机主机板的测试 ,故障覆盖率高。该测试方法对其它机载计算机系统的测试具有推广价值。     

交联淀粉在食品加工中的应用

综述了交联淀粉的性质及其在食品加工、微胶囊膜材等方面的应用。     

Scale effects and scaling-up by geometric-optical model

By considering the constitution relationship between stress and strain in viscous EDA media in the domain of frequency, seismic wave equations in the media in the domain of time and space are established. The anelastic effects induced by cracks or fractures are shown by the third derivatives of displacement components with respect to time in the equations. After solving the equations for the seismic propagation of plane waves, seismic velocity, attenuation and quality factor ( Q value) are obtained, and their azimuthal anisotropy in the dry cracked and water saturated cracked EDA media are studied. The results show that, seismic velocity, attenuation, quality factor ( Q value), especially attenuation or quality factor ratio of 2 kinds of qS wave can be used to indicate the existence of oriented cracks and material contents in the crack. Meanwhile, elasticity is predominant at low frequency, and anelasticity is significant at high frequency.     

Further Improvement in Mechanical Properties of Highly Anisotropic Silicon Nitride Ceramics

Si₃N₄ceramics were fabricated by tape casting of a raw-powder slurry seeded with three types of rodlike β-Si₃N₄particles. The effects of seed size on the microstructure and mechanical properties of the sintered specimens were investigated. All the seeded and tape-cast silicon nitrides presented an anisotropic microstructure, where the elongated grains grown from seeds were preferentially oriented parallel to the casting direction. The orientation degree of these grains, f ₀, was affected by seed size, and small-seed addition led to the highest f ₀value. This material exhibited high bending strength (∼1.4 GPa) and high fracture toughness (∼12 MPa^.m^1/2) in the direction normal to the grain alignment, which were attributed to the highly anisotropic and fine microstructure.     

Ce2(CO,Ga)17化合物的结构与磁性

用三弧Czochralski法和真空电弧熔炼法制备了Ce     

新型平面直线驱动系统及其在机器人末端操作器中的应用

研制了一种机器人微驱动末端操作器用新型二自由度平面直线驱动系统 ,该二自由度电动机由于在X及Y方向采用共用永磁体的结构 ,与传统电机系统比较具有较高的性能体积比 ,应用于实际操作器系统中取得良好的效果