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.     

关于(n,[n~c])=1的自然数

设c>0是一个非整数实数,x是一个充分大实数．令Nc(x)表示不超过x且满足(n,[nc])=1的自然数n的个数,本文得到了Nc(x)的渐近公式,改进了Delmer 和Deshouillers的结果．     

Δ(x)的高次均值(Ⅳ)

研究了Dirichlet除数问题的余项Δ(x)在小区间上的k次积分均值(k≥3), 并得到了其渐近公式．特别在k=3和k=4时,进一步改进了Ivic和Sargos的结果．     

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.     

数学谜语

‘.，-‘.甲-鑫V-‘.，.么甲-‘.丫.血甲-主下.盛甲-五甲‘1.田. 2.安定才能团结. 3.先前太贵. (以上各打一数学名词) 4.基础不好. (打三个数学名词) 1.重心. 2.平方和. 3.近似值. 4.根、底、差数学谜语@文广!北京~~     

数字魔方(十一)

据报载,数字魔方现风靡英美等国,本刊每期选登一款,供读者朋友茶余饭后休闲玩耍．游戏规则:每一行、每一列以及每一个3×     

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.