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.     

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.     

直流电弧等离子体喷射化学气相沉积高质量金刚石膜残余应力分布的拉曼谱分析

不同工艺条件下在钼衬底(φ60mrn)上用100kW直流电弧等离子体喷射化学气相沉积设备进行金刚石膜的制备。金刚石膜用扫描电镜(SEM)、拉曼谱(激光激发波长为488m)和X射线衍射来表征。研究结果表明，在直流电弧等离子体喷射化学气相沉积金刚石膜的过程中，内应力大小从金刚石膜的中央到边缘是增加的，并且应力形式是压应力。这说明了在金刚石膜中存在明显的应力不均。甲烷浓度和衬底温度都影响金刚石膜中的内应力。随着甲烷浓度和衬底温度的提高，金刚石膜中的内应力呈增加的趋势。     

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.     

利用故障数据和估计的检查数据建立维修优化模型

利用时间延迟概念,根据故障记录数据和估计的检查数据建立了预防维修模型.通过对故障记录数据统计分析,提出了模型的假定条件.采用最大似然估计法,估计参数,包括缺陷发生率、不完全检查概率和时间延迟分布.建立了有关预防维修间隔期和总停机时间之间关系的检查模型,并根据估计参数和检查模型,计算最佳维修间隔期.     

涉及小函数的亚纯函数

是否可以将第二基本定理的一般形式中常数替换为小函数,这一直是人们试图解决的重大问题.该文研究了涉及小函数的第二基本定理的推广问题, 并利用主要结果得到了几个惟一性定理, 改进了张庆德, Toda N和姚卫红等人的有关定理.     

度量空间中反交换映射的公共不动点

通过引入度量空间中的反交换映射，证明了一个公共不动点定理。这一结果不同于相关的献。