Research on Grinding Characteristics of Throw-Away Diamond Wheel

针对现有超大规模集成电路基板加工中存在的效率低问题 ,提出一种免除砂带张紧装置、消除砂带横向振动影响 ,达到柔性砂轮磨削效果的新型砂轮。新型砂轮结合了砂带磨削加工效率高、发热低的优点及砂轮磨削精度高和设备简单的条件 ,解决了集成电路基板高效磨削的问题。通过和树脂砂轮的对比实验表明 ,柔性砂轮对石英基板具有良好的磨削性

Optimization of Structure Parameters in Ultra-precision Plane Honing

超精密平面研磨中工件的加工精度受到研磨轮结构参数的影响。为了得到最高的加工精度和最合理的砂轮磨损曲线 ,必须研究研磨轮的结构参数。通过研究研磨轮的加工精度系数曲线和磨损系数曲线得出 :对于大量生产的研磨机床 ,研磨轮磨损是加工精度的主要影响因素 ,研磨轮应采用正三角形放射线结构 ;对于高精度小批量的研磨加工 ,加工精度系数是主要影响因素 ,研磨轮应采用反三角形放射线结构The structure parameters of honing wheel have effects on machining accuracy in ultra-precision plane honing. This paper put forward to the optimization of structure parameters. By calculating the machining accuracy coefficient and wear coefficient of triangle radial structure honing wheels, it is obvious that the suitable triangle radial structure honing wheel can improve machining accuracy of workpiece.国家 8 63基金资助项目 ( 80 42 416

Study on Compensating Technology of Axisymmetic Aspheric Mould Machining

研究精密磨削以及超精研磨轴对称非球面模具中 ,磨削力和速度变化对加工表面精度的影响因素 ,提出一种使用软件技术对加工误差进行补偿控制以提高加工精度的方法。This paper describes a new error compensating technology with software control in axisymmetric aspheric mould machining.Analyzing the effects of grinding force and wheel speed on surface quality and using the compensating method in precision grinding and super precision finishing,a high precision mould has been obtained

模拟渗漏系统气体迁移与水合物形成实验

水合物生成是典型的界面传递输运现象，而气体迁移性质是这种传递过程的决定性因素。在鼓泡透明玻璃反应釜里模拟渗漏系统气体穿越多孔隙砂层形成水合物的过程实验，分析了气体迁移对气体水合物形成时气液界面的传质传热性质影响。表明实验中气体迁移形成水合物的过程是一种相平衡曲线动态移动的过程；在形成水合物的气-液界面存在具有一定厚度的过渡层，只要过渡层内气体达到饱和即可形成水合物；气体在迁移中不断形成水合物并在孔隙中形成过压，导致地层骨架的力学破裂和失稳；必须建立一个新的水合物相图以适应气体迁移形成水合物过程的这种新特性

HCFC-141b乳化液生成气体水合物

提出以HCFC-141b的O／W型乳化液形成其气体水合物的设想，且在可控变温仪中进行了程序降温实验。采用的乳化剂为OP-10和SDS。实验结果表明，在静态、高于-5℃的情况下，不同HCFC-141b含量的乳化液均能形成水合物；但诱导期随机性很强，起始水合温度也有一定的波动性；水合物形成前后都会结冰，结冰和加入冰粒都能诱发水合物的快速形成；水合物分解后，液体经再乳化后可以重新使用，其“记忆”效应可使其在1h内于冰点以上形成水合物

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies