Results 31 to 40 of about 25,884 (166)
Analysis of Acoustic Emission and Microseismic Signal Characteristics and Useful Signal Extraction [PDF]
, 2017 声发射技术与微震监测技术是两门先进的高科技技术，可应用与岩土工程、水电工业、建筑工程、交通运输、矿业开发等重要领域，是一种动态的立体范围的空间监测方法，可进行全天候监测。基于声发射技术的室内岩石破坏声发射试验是研究岩石破裂机制、内部损伤演化、破坏前兆特性等的重要途径，这对岩石本身性质的研究和对工程现场的应用都有实用价值和指导意义。而在矿产资源开采的工程中，矿山作业的安全开展关系着矿业的可持续发展、工作人员的生命安全以及对社会和谐的影响，微震监测技术在安全监测中扮演着重要角色，其在信号辨识处理 ...
高真平
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Conservation Biology, EarlyView.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
wiley +1 more source
Dianci bileiqi, 1975 在进行外部绝缘工频电压试验时,现行国标GB 311—64(高压电气设备绝缘试验电压和试验方法)和GB775—64(绝缘子试验方法)都对试验装置的短路电流有明确的规定:“在试验电压下应满足下列要求:①在干燥状态下进行外部绝缘试验时,试验装置高压侧的稳态短路电流有效值应不小于0.1安。②在淋雨状态下进行外部绝缘试验时,短路电流的最大幅值应不小于0.7安 ...
西安电瓷研究所一室试验组
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Although the use of AI technologies (e.g., chatbots and automated writing evaluations (AWE)) has gained considerable attention in language learning fields in recent years, how AI technologies have been designed and implemented in language learning education, as well as their effectiveness, is understudied.
Shen Qiao +2 more
wiley +1 more source
Gaoya dianqi, 2005 提出了声发射法检测绝缘子放电的方案,试验研究了该方案的可行性及不同放电形式的识别问题。具体内容包括试验装置、试验方法和试验结果,在大量试验的基础上,分别研究和总结了绝缘子内部放电、表面污秽放电和电晕放电时声发射波的特征,研究了声发射检测中的干扰和抗干扰措施。
王成江 +4 more
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Wear Resistance of Cast Iron Remelted by Non-Transferred Laminar Plasma Jet [PDF]
, 2004 对在大气压条件下用非转移弧层流等离子体射流熔凝强化处理的W-Mo-Cu铸铁表面,采用光学显微镜、显微硬度计、磨损试验机、扫描电镜等,观察和测试了熔凝试样的表面层组织、硬度、耐磨性和磨损形貌.结果表明,熔凝后铸铁表面为初晶渗碳体和莱氏体组成的过共晶组织 ...
潘文霞, 费群星, 马维
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Basic income trials and the politics of scale: A research agenda
Policy Studies Journal, EarlyView.Abstract The growing popularity of basic income has led to extensive trials of the policy in numerous settings across the world. However, analysis of the politics of basic income, and in particular the political dynamics preceding and resulting from trial programs, lags. In response, we propose a research agenda that uses political scale to investigate
Jurgen De Wispelaere +2 more
wiley +1 more source
Research on the influence of seepage on the mechanical behavior and slope stability of granite residual soil [PDF]
, 2017 花岗岩残积土在我国东南沿海地区广泛分布，是很多工程构筑物的组成材料、地基或地层环境介质。渗流会对土体产生力学、物理和化学方面的作用，从而导致土体力学特性变化，影响边坡稳定性。因此研究渗流对花岗岩残积土的力学特性及边坡稳定性影响具有重要的理论和现实意义。 本文在总结分析土体力学特性、渗透特性和渗流对土体力学特性及边坡稳定性影响研究发展概况的基础上，利用土工基础试验仪器和三轴渗流剪切试验仪，借助有限元分析软件，进行了以下几方面的工作： (1)测试分析了花岗岩残积土试样含水率、比重、颗粒组成 ...
李祥华
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Powerful representation of the poor? German welfare associations' narrative advocacy during COVID‐19
Policy Studies Journal, EarlyView.Abstract The COVID‐19 pandemic sparked unprecedented experimentation in the German social assistance system, leading to changes previously considered impracticable by policymakers. This included a sanctions moratorium, easier access to benefits, and temporary cash transfers, all of which were advocated by welfare associations—key organized interests ...
Christopher Smith Ochoa
wiley +1 more source
Dianci bileiqi, 2018 为了降低污闪事故的威胁、了解绝缘子积污机理,研究人员在绝缘子积污特性方面做了许多工作,但仍少有针对均匀电场下的绝缘子积污特性的深入研究。为了研究均匀电场下绝缘子的积污特性,研制了一种用于均匀电场下人工积污试验的装置,该装置由恒温恒湿箱、无风试验罐以及粉尘发生器组成,使用多个测量装置监控试验区内的环境参数,并设计了相应的试验方法,按负反馈逻辑控制试验区内的环境参数。通过仿真计算与实际测量的手段对装置和方法的有效性做了初步研究,研究结果表明,该装置不仅能提供不同电压种类、场强可控的均匀电场 ...
梅红伟 +4 more
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