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Li YANG 《等离子体科学和技术》2022,24(10):105505
Atmospheric pressure plasma jet (APPJ) was used to clean nitrogen-containing carbon films (C–N) fabricated by plasma-assisted chemical vapor deposition method employing the plasma surface interaction linear device at Sichuan University (SCU-PSI). The properties of the contaminated films on the surface of pristine and He-plasma pre-irradiated tungsten matrix, such as morphology, crystalline structure, element composition and chemical structure were characterized by scanning electron microscopy, grazing incidence x-ray diffraction and x-ray photoelectron spectroscopy. The experimental results revealed that the removal of C–N film with a thickness of tens of microns can be realized through APPJ cleaning regardless of the morphology of the substrates. Similar removal rates of 16.82 and 13.78 μm min−1 were obtained for C–N films deposited on a smooth pristine W surface and rough fuzz-covered W surface, respectively. This is a remarkable improvement in comparison to the traditional cleaning method. However, slight surface oxidation was found after APPJ cleaning, but the degree of oxidation was acceptable with an oxidation depth increase of only 3.15 nm. Optical emission spectroscopy analysis and mass spectrometry analysis showed that C–N contamination was mainly removed through chemical reaction with reactive oxygen species during APPJ treatment using air as the working gas. These results make APPJ cleaning a potentially effective method for the rapid removal of C–N films from the wall surfaces of fusion devices. 相似文献
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为提高萨尔图油田三类油层实施弱碱三元复合体系驱油效果,开展室内岩心驱替实验,对比分析了不同注入时机、不同聚合物浓度、不同表面活性剂浓度及不同注入方式的驱油效果。结果表明:对于三类油层,水驱转注三元复合体系的时间越早,采收率越高;三类油层实施弱碱三元复合体系驱油时,主段塞聚合物浓度越高,表面活性剂浓度越高,采出程度越高;注入聚合物前置段塞的体积越大,聚合物后续保护段塞体积越大,采出程度越高;相对分子质量为620 X 104聚合物的三元复合体系中聚合物浓度大于2 750 mg/L时,在水驱基础上化学驱采出程度大于11%;相对分子质量为700 X 104(抗盐)和相对分子质量为1 400×104聚合物的三元复合体系在水驱基础上化学驱采出程度均大于20%。 相似文献
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本文根据浮式检修门(以下称浮门)在葛洲坝船闸的多次使用及两次大修实践,着重对浮门的修理施工技术和技术关键等问题进行分析与介绍。并对三峡工程永久船闸下游挡水浮门的设计、制造与今后的使用、大修提出建设性的意见。 相似文献
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CT数据既是开展肿瘤精确放射治疗的基本数据,也是利用蒙特卡罗方法开展个体化剂量分布计算的主要数据。通过提取CT数据中的像素信息,进而转化为对应组织材料信息,重建得到个体化数字体模。利用所构建的数字体模,作了一些初步应用,结果表明基于CT数据获取的MCNP个体化体模正确,可为放疗计划的评估提供参考依据。 相似文献
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