LCAC—SW方法中阻尼函数的研究

研究了在排列通道线性组合散射波方法中阻尼函数的衰减形式，通过计算表明，在三维Ｈ＋Ｈ２交换反应中，阻尼函数应以快于１－ｅｘｐ的形式，如ｆ（Ｒ）＝１－ｅｘｐ，在经典回转点处衰减为０，同时提出闭通道函数应分布在准经典近似不适用的区域。     

A top-face-sway electromagnetic micromotor

In this paper, the structure of a top-face-sway electromagnetic micromotor and its principle, fabrication and performance are introduced. A combination of the electromagnetic actuating and the planetary reducing provides this micromotor an advantage of low rotational speed and high torque. In addition, since a flexible coupling absorbs the sway and only outputs rotation, it gives this micromotor a balanced output. The dimension of the micromotor is 5 mm. Its rotation speed has a range of 20 - 860 rpm, and its driving current is 300 mA. The output torque of the micromotor is measured to be 13.0 uNm.     

离子束注入对聚四氟乙烯表面改性研究

在剂量为1×1014～1×1017 ions/cm2的范围内,用能量为160 keV氮离子对PTFE表面进行注入处理,处理后的样品用可见(514.5nm)和傅立叶红外(1064 nm)喇曼(Raman)光谱以及扫描电镜进行检测.结果表明低剂量注入可导致弱C-C键的断裂,中等剂量时溅射损失效应明显,高剂量注入时微观结构强烈地变化并生成C=C双键.     

A quantum scattering study of collinear state-to-state reaction probabilities for the F+H_2(ν)→-HF(v'''')+H system

A new quantum scattering approach (linear combination of arrangement channels-scattering wavefunction,LCAC-SW) proposed by Deng and his co-workers is used to calculate collinear state-to-state reaction probabilities for the F + H-2(v)→HF(v')+H system.Several interesting problems such as threshold energy,compound states and enhance by translational energy of the reactants and the vibration excitation of products are discussed and they are compared with other theoretical investigations reported in the literature.It is shown that the LCAC-SW approach is the successful one of quantum scattering methods.     

Behaviour of Self-Standing CVD Diamond Film with Different Dominant Crystalline Surfaces in Thermal-Iron Plate Polishing

Self-standing CVD diamond films with different dominant crystalline surfaces are polished by the thermal-iron plate polishing method. The influence of the dominant crystalline surfaces on polishing etfficiency is investigated by measuring the removal rate and final roughness. The smallest rms roughness of 0.14 μm is measured with smallest removal rate in the films with the initial （220） dominant crystalline surface. Activation energy for the polishing is analysed by the Arrhenius relation. It is found that the values are 170kJ/mol, 222kJ/mol and 214kJ/mol for the film with three different dominant crystalline surfaces. Based on these values, the polishing cause is regarded as the graphitization-controlling process. In the experiment, we find that transformation of the dominant crystalline surfaces from （111） to （220） always appears in the polishing process when we polish the （111） dominant surface.     

关于开孔薄板大挠度问题的一般数学理论(续)

本文讨论了作用在开孔薄板的各孔边上的外力自身不平衡吋的大挠度问题的应力函数的多值性,并给出了这种问题的一般数学模型,因此本文可以看成是[1]的继续和深入。     

改进的时域多点激振复指数结构模态识别方法

本文提出了一种改进的时域多点激振总体结构模态参数识别算法.介绍了本方法的理论背景及算法的理论基础,阐明了各时域方法,如多点激振复指数方法(PRCE),特征系统实现算法(ERA),Ibrahim时域(ITD)方法等,之间的内在的联系.针对PRCE方法固有的缺陷,即对于随机噪声的高度敏感性和模型参数估计的偏度误差等,提出了利用时域滤波预处理技术,以减少原始数据中随机噪声的影响,在模型参数的求解过程中,采用了总体最小二乘算法以使模型参数估计的偏度误差极小化.和PRCE相比,不仅精度改善,且大大减少了估计问题的规模,对所需计算阶次的判断也更加可靠和简单.同时亦改进了留数的估计方法,由于考虑了时域剩余项而提高了精度.最后,给出了几个计算实例.     

利用倍频技术产生265紫外激光

紫外激光在光化学、生物化学、高能光子研究、农业等方面有广泛的应用.由于自发辐射几率与频率的三次方成正比,因此直接通过受激发射获得紫外激光是比较困难的,于是人们常常利用非线性光学晶体的倍频效应来产生紫外激光. 1975年4月到7月,山东大学光学系工农兵学员吕绍兴、徐大顺到中国科学院物理研究所激光研究室非线性光学研究小组进行毕业实习,参加了该组的工作,在此期间做了将钕玻璃激光器输出的1.06μ红外激光经过两次倍频以后产生2650A紫外激光的工作,本文对此工作作一个简单的介绍. 一、实验装置 根据当时的条件,我们对实验作了如下…