Results 31 to 40 of about 5,560 (166)
Identification, spatial distribution, and associated factors of urban protected areas in China
Conservation Biology, Volume 38, Issue 6, December 2024.Abstract The increasing proximity between protected areas (PAs) and urban areas, which can lead to urban protected areas (UPAs), is now commonplace. Use of Euclidean distance to measure the distance between PAs and cities has not correctly portrayed the spatial relationship between PAs and cities.
Zuo Zitong, Wang Shuyi, Zhong Le
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Gaoya dianqi, 1991 真空灭弧室的真空度检测方法主要有脉冲磁控管放电法、高频火花检漏法和工频耐压法。 脉冲磁控管放电法检测真空度的范围一般为5×10-7～1.33×10-1Pa。可以定量分析,具有一定的检测精度。但是它的测量方法比较复杂,对于大多数真空断路器的用户来说不适用。 高频火花检漏法是根据火花放电的颜色来判断灭弧室内的真空度。当真空度低于1.33Pa时 ...
张正庆
doaj
Synthesis, characterization and field emission properties of metal carbide and boride nanowires with low work function [PDF]
, 2012 Thesis (Ph. D. in Engineering)--University of Tsukuba, (A), no.
元 金石
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Journal of Linguistic Anthropology, Volume 34, Issue 3, Page 441-469, December 2024.Abstract This paper develops the concept of “indexical deprivation” from the experiences of English learning in relation to cochlear implant use among Taiwanese deaf adults. Based on the framework of language ideological assemblage, this paper traces how institutional discourses and practices at different levels contribute to the indexicalization ...
Tsung‐Lun Alan Wan
wiley +1 more source
On the Impurities in Magnesium Produced by the Reduction with Fe-Si Alloy [PDF]
, 1962 By studying the cause of the mixing of the impurities in magnesium produced by the reduction method the following results were obtained. A part of Fe, Al, Mn in magnesium produced comes from the reducing material, Fe-Si.
池田 正夫
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Policy &Internet, Volume 16, Issue 3, Page 543-566, September 2024.Abstract Content moderation comes with trade‐offs and moral dilemmas, particularly for transnational platforms governing borderline content where the boundaries of acceptability are subject to debate. While extensive research has explored the legality and legitimacy of platformised speech governance in established democracies, few address the ...
Diyi Liu
wiley +1 more source
Gaoya dianqi, 2000 介绍了电光法在线检测真空灭弧室真空度的原理和方法 ,在此基础上开发了一套试验系统 ,并给出了部分试验结果 ,为实现真空灭弧室真空度智能化在线检测做了准备工作。
段雄英, 赵子玉, 邹积岩
doaj
Gaoya dianqi, 2017 基于灰色关联度和TOPSIS法对真空断路器运行状态进行综合评估,根据真空断路器典型故障类型,构建由振动信号、真空度、电寿命、触头温度组成的评估指标体系,采用熵权法确定各项指标权重系数。通过样本与正理想解和负理想解的欧氏距离和灰色关联度描述样本与理想方案的贴近程度,综合灰色关联度和欧氏距离计算评估样本的相对贴近度,并据此对评估样本进行优劣排序。实例论证及与其他方法对比表明,该方法可以客观有效地评估真空断路器运行状态,为合理安排真空断路器检修计划以及指导真空断路器设备维修提供可靠参考。
李济沅 +4 more
doaj
Preparation and Characterization of FeOx/Rh(111) and CoOx/Rh(111) Model Catalysts [PDF]
, 2014 多相催化剂的表面是催化反应的活性位点，表面组成、粒径和结构决定了催化剂的催化性能。真实催化剂结构复杂并且表面不均一，阻碍了表面灵敏的表征手段的运用，无法精准确定其构效关系。构建成分简单结构单一的模型催化剂表面可简化传统催化剂的复杂性，用以研究气体吸脱附、催化活性和选择性、构效关系等催化问题。本论文在超高真空环境中制备模型表面FeOx/Rh(111)和CoOx/Rh(111)，应用表面科学仪器X-射线光电子能谱(XPS)和低能离子散射谱(LEIS)对模型表面进行表征，取得了如下结果： 一、在高温 ...
王文毅
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