Irradiation embrittlement monitoring of WWER-440/213 TYPE RPVs

In the paper the main goals and progress of the surveillance specimen programme for the RPVs WWER-440/213 in Jaslovské Bohunice V-2 and Mochovce NPPs are presented. At Jaslovské Bohunice V-2, the standard surveillance specimen programme (SSSP) was finished and so-called ‘Extended Surveillance Specimen Programme’ (ESSP) was prepared on the base of its critical analysis. For first two units of the Mochovce NPP completely new programmes of irradiation embrittlement monitoring called ‘Modern Surveillance Specimen Programme’ is prepared. It is based on the experience with SSSP and ESSP as well as the recommendations of IAEA experts. This programme will serve for Mochovce NPP during all planned service life. The experience of ESSP application on the 3rd and 4th units in Jaslovské Bohunice V-2 NPP are presented in the paper too.     

大型异形件冲模凹模设计

阐述了镶拼式组合凹模的冲模结构特点 ,着重介绍了组合凹模的设计要求 ,通过实例 ,分析了冲模分块位置及分模面设计。     

用脉冲全息法分析冲床的动态特性

介绍了双脉冲激光全息照相对机床结构动态特性的现场测量技术,并应用它成功地分析研究了冲床整机的动刚度和振型。     

平流层浮空器用柔性复合材料的断裂性能

对某浮空器蒙皮用柔性复合材料的撕裂性能和顶破性能进行了实验研究和数值分析。通过不同切口宽度和总宽度试样的撕裂实验, 发现撕裂过程为典型的脆性断裂特征, 根据线弹性断裂模型对撕裂过程进行数值模拟得到与实验结果一致的断裂过程, 通过数值计算得到扩展过程中裂纹尖端的应力强度因子, 计算得到的撕裂承载能力随相对切口宽度增加而降低, 与实验结果一致。对不同直径试样进行顶破实验, 并以断裂应变为裂纹临界扩展的断裂模型进行数值分析, 得到顶破模拟结果与实验结果一致: 使顶破位置达到相同的断裂应变值, 大直径试样需要较大的位移值, 失效时圆心位置的应力水平保持不变使得最大顶破承载水平保持不变。      

冲孔灌注桩在某220kV变电站岩溶地基中的应用

结合某220kV户内变电站冲孔灌注桩的岩溶地基处理,论述了冲孔灌注桩根据溶洞深度、层次和填充物的类型采取不同的溶洞处理施工方法,并提出防止漏浆、塌孔、卡钻、斜钻等技术措施,施工效果检验良好。     

高压氢镍电池正极板冲压研究与模具设计

对卫星用高压氢镍电池正极极板的冲压工艺过程进行了分析,并设计了相应的模具,改善了高压氢镍电池正极极板的冲压质量,延长了模具使用寿命。     

冲裁模刃口尺寸计算公式

在冲裁模设计中,冲裁模的凸模、凹模刃口尺寸计算公式是根据落料以凹模为基准件配制凸模,冲孔以凸模为基准件配制凹模的原则建立的。但在实际生产中,由于条件和习惯的原因,部分工厂采用不分落料、冲孔,均是先制造凸模,再配制凹模,或者反之,这样就需要进行换算。本文根据基准件理论公式,考虑到模具磨损后尺寸变大、变小和不变的三种情况,由基准件向非基准件换算,通过图解分析、公式变换,导出方便、实用的刃口尺寸（A非,B非,C非）计算公式,解决了当先制件为非基准件时,其刃口尺寸计算无理论公式直接套用的问题。     

带孔的导向管充气喷动床的流动特性

在Φ９２ｍｍ的有机玻璃导向管充气喷动床反应器内,以玻璃珠为实验物料,以空气作流动介质,在导向管的管壁上开孔,考察导向管的开孔率对导管管充气喷动床的床层压降、最小喷动速度、最大允许充气速度以及颗粒在壁效应区下移速度的影响。结果表明：随开孔率的变化,其床层压降曲线仍呈峰值变化,而且开孔率增加,床层操作压降减小。开孔后最小喷动速度略有增加,而最大允许充气速度有所减少,但开孔率为１时的最小喷动速度和最大允     

材料弹性模量小型冲压实验测试的理论公式

采用简化的薄板弯曲理论模型，导出了小型冲压弹性模量测试实验中弹性模量的一个理论计算公式，针对该公式误差较大的现象，采用有限元分析方法研究了误差产生的原因，并提出了该公式的修正方法，求得了修正系数，建立了一个新的弹性模量的计算公式。通过验证，该公式具有很好的精度和较好的普适性，可应用于小型冲压弹性模量测试实验。     

Gate oxide punching thru mechanism in plasma dry etching

The punching thru mechanism of gate oxide (thickness about 15A) was investigated. Because of the thin thickness of gate oxide, gate oxide punching thru may easily happen during the plasma process. It was found that what caused the punching thru was not only the selectivity of poly-silicon/oxide but also the pattern topography. We used the basic SRAM pattern to check this topography effect, and found that gate oxide located at the narrow spacing of two parallel serpentine lines was the most easily punched thru. What caused the topography effect was the starvation of oxygen in these places which were induced by the residue of poly-silicon and enhanced by electron shading effect. So, to solve the issue of gate oxide punching thru, firstly the selectivity should be enough, secondly we should pay attention to the etching pattern topography. Supported by the National High-Tech Research and Development Program of China (“863” Project) (Grant No. 2006AA843134) and the National Basic Research Program of China ("973" Project) (Grant No. 2007CB935302)