Results 11 to 20 of about 4,467 (118)
Kongjian kexue xuebao, 2023 中国空间站高温材料科学实验系统能够在轨进行多种材料的微重力高温加热实验，其关键组件真空室是可实现密封的压力容器，为实验插件提供机械、真空、氮气、废气排放、供电、控制、冷却等接口，支持实验插件完成相关功能。本文依据承压范围、漏率等设计技术指标进行真空室的结构设计和力学分析。真空室采用分段式结构，由方形真空室、密封门、圆形真空室、安装支架等组件依次连接组成，连接结构处使用密封圈。通过真空室的承压分析、模态分析、随机响应分析和力学试验，校核了真空室的强度、刚度及随机振动响应特性 ...
崔 晓杰 +5 more
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真空开关全气压范围内激光诱导等离子体特性及其在真空度检测中的应用研究
Gaoya dianqi, 2021 真空开关由于其具有结构紧凑、维护方便、无温室气体排放和分断能力强等优点,因而被广泛运用于中压级电网中。真空灭弧室作为真空开关的核心部件,内部气压(真空度)决定了电路能否可靠地开断。现阶段,真空开关真空度在线检测依然是一个国际性难题,并无行之有效的在线检测手段。文中采用等离子体成像的方式研究了不同气压和不同激光能量下等离子体的演化规律,实验结果显示环境气压对等离子体的演化过程有着显著的影响,存在明显的区间效应;同时,不同激光能量下等离子体膨胀规律具有相似性。为了定量化等离子体随真空度的变化 ...
万康鸿 +8 more
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Gaoya dianqi, 2021 文中的目标是研究真空中火花老炼对电极表面状况的影响。通过比较真空间隙火花老炼前后电极的表面状况,分别研究了Cu和SUS304两种电极的老炼过程对于电极表面状况的影响。同时在实验回路中加入限流电阻,研究老炼过程中不同击穿能量对于电极表面状况的影响规律。实验结果表明了针对Cu电极的真空间隙,火花老炼后电极的表面状况与老炼过程中的击穿能量有关,与电极表面的初始粗糙度无关。击穿能量越小,电极表面越平滑。因此,较小的击穿能量能将真空间隙的绝缘强度老炼得更高 ...
刘庆 +6 more
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Research on English‐Medium‐Instruction (EMI) highlights inadequate support for students transitioning from L1‐medium‐instruction to EMI. To date, little research has focused on how L2 students’ adaptation to an EMI environment influences their L2 learning motivation (LLM).
Kevin W. H. Tai
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Studies on classroom interactions suggest that displaying affiliation through linguistic and multimodal resources could promote positive emotions like enjoyment, thereby enhancing engagement and enthusiasm in second/foreign language learning.
Karen C. K. Choi, Kevin W. H. Tai
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Biodegradable Zn‐based alloys are promising candidates for temporary implants, yet excessive Zn2+ release during degradation may induce cytotoxicity and adverse tissue responses. In this study, Zn‐xBa alloys (x = 0.1 wt%, 0.5 wt%, 1.0 wt% and 3.0 wt%) were developed to achieve controlled corrosion behaviors with improved biocompatibility.
Liu‐Dang Fang +9 more
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Functional Ecology, Volume 40, Issue 7, Page 2068-2082, July 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract Grasslands worldwide are experiencing severe degradation due to overgrazing, climate change and anthropogenic disturbances, resulting in substantial declines in biodiversity and ecosystem functioning.
Xiaoqi Wang +5 more
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Atom Probe Tomography‐Based Analysis of Residual Trace Elements in Advanced Metallic Materials
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Residual trace elements inherited from raw materials strongly influence the mechanical and environmental performance of advanced metallic alloys and recycling materials due to preferable boundary/interface segregation and resultant embrittlement effects, yet their parts per million level concentrations pose significant challenges to ...
Congcong Li +17 more
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Gaoya dianqi, 2011 基于磁控脉冲放电的真空度测试仪在电力系统中广泛应用,但其测量结果和精度越来越受到关注。笔者论述了真空度校验仪的测量原理,阐述了校验仪主要四部分的设计,包括真空灭弧室选择、抽真空系统、绝缘考虑和真空度测量,给出了校验仪的控制流程和方法,通过测试介绍了校验仪装置的抽真空时间曲线、典型离子电流与真空度关系曲线及在短期重复测试的问题及解决办法。该装置适合电力系统用校验12 kV真空灭弧室真空度测试仪的校验。
梁义明 +6 more
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Conservation Biology, Volume 40, Issue 3, June 2026.Abstract Achieving global conservation policy goals requires the ability to set and measure progress toward science‐based targets for biodiversity. The species threat abatement and restoration (STAR) metric was developed to enable actors to set science‐based targets for species.
Louise Mair +17 more
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