2,3,16,17-四羧基酞菁钴对氧还原的电催化作用

用循环伏安法及旋转圆盘-环电极研究了2,3,16,17-四羧基酞菁钴(CoTCPc)在溶液中及CoTCPc/GC修饰电极上对O_2还原的电催化作用。实验结果表明,CoTCPc对O_2电还原有明显的催化作用。在Co(Ⅱ)TCPc还原为Co(Ⅰ)TCPc的第一个峰电势附近,O_2在CoTCPc/GC修饰电极上定量地还原为H_2O_2,在稍负的第二个峰电势附近,有H_2O_2还原产生H_2O的过程发生。本文并对CoTCPc对O_2还原电催化过程的机理进行了讨论。     

BP神经网络在旋转机械故障诊断中的应用

人工神经网络模型是在现代生物神经系统研究基础上建立的一种网状结构，是对人脑某些基本特性的一种简单的数学模拟。神经网络以其信息的并行分布式处理、联想记忆、自组织及自学习能力，在机械故障诊断领域显示了极大的应用潜力。本文就神经网络对给定知识的表达、联想、记忆能力及网络结构进行了研究，利用反向误差传播网络对旋转机械中四种典型故障进行了实例分析诊断，取得了令人满意的效果。     

用迈克耳逊干涉仪测固体线胀系数

利用迈克耳逊干涉仪可精确测量微小长度这一特性来测定固体热胀冷缩的微小变化量,从而得到一种能够精确测量固体线胀系数的新方法。     

定轴旋转参照系中物体的运动规律

利用旋转非惯性系中的基本动力学方程,导出在定轴旋转参照系中物体运动的基本规律,以及物体动量守恒和动量矩守恒的条件.     

Molecular dynamics simulation and continuum modelling of granular surface flow in rotating drums

Numerical simulations of granular flows in rotating drums operated at medium to high rates (Fr=0.1― 0.2) have been carried out by using a Molecular Dynamics (MD) algorithm that incorporates inelastic particle interactions, sliding friction and rolling friction. The results indicate that the behavior of granular flow in rotating drums can be classified into two distinct zones: a shear active layer at the bed surface and a quasi-static plug flow region adjacent to the wall. The residence time of a tracer particle in the active layer is approximately a third or a half of that in the plug flow region. The thickness of the active layer at mid-chord is about 0.57―0.61 times that of the plug flow region. It is found that all cases simulated in this work are in the rolling-cascading intermediate regime instead of the pure rolling re-gime. The simulated tangential velocity at the mid-chord is also compared with experimental results reported in the literature and good agreement has been obtained. Based on the MD simulations and experimental results, a continuum approach has also been developed. It is shown that the behavior of granular solids in the plug flow region experiences plastic deformation along the radial direction from the wall with the velocity profiles well described by an exponential function, whereas the active layer velocity follows a simple expression for the Couette shear flow. Discussion has also been made on the granular temperature and concentration profiles.     

提高旋转变压器角度测量精度的细分方法

在分析了旋转变压器工作原理的基础上,提出了通过晶振脉冲连续计数测量其感应信号周期来细分角位移量的方法,并应用单片微机技术,设计了实现该方法的细分电路.     

干涉仪测向解模糊方法

介绍了干涉仪测向基本原理,针对干涉仪测向模糊问题给出了长短基线法、参差基线法、虚拟基线法、无模糊长基线干涉仪测角法、立体基线法5种解模糊的方法,并分析总结了各种解模糊方法的特点以及适用条件.     

中频差Zeeman双折射双频激光干涉系统的实验研究

Zeeman双折射双频激光器能够输出3~40 MHz频差的双频激光,可用作高测速双频激光干涉仪的光源。针对这种激光器的特点,以频差约7 MHz的Zeeman双折射双频激光器为干涉仪的光源,建立了中频差双频激光干涉仪测量系统。经过与商用HP5528A双频激光干涉仪的比对测量实验得出,中频差双频激光干涉仪实验测量系统测量线性度小于0.002%,测量的标准不确定度小于0.1μm,证明了中频差双频激光干涉系统的可行性和针对这种光源采用的设计方案的正确性。     

迈克尔逊干涉仪测角度改变量

讨论了迈克尔逊干涉仪补偿板的作用和补偿板角度改变量的测量方法。补偿板的转动会引起光程差的变化，产生干涉条纹数目的变化。通过测量条纹的改变数目，算出补偿板的角度改变量。文中所述方法新颖，精确度较高。     

Measurement of creep of optical fiber by a low coherent white light double interferometer system

The creep properties of optical fiber used in fiber optical sensors were studied in this paper.A low coherent white light double interferometer system was designed and calibrated and the creep deformations of optical fibers under static and cyclic loadings were measured with this device.The research results showed that polymer coated optical fibers crept at the beginning when they were under static or cyclic load.As the number of the cyclic loading or the static loading times increased the creep tended to s...