Results 31 to 40 of about 32,994 (251)
Dianci bileiqi, 2019 接地网是电力系统重要的防雷、防静电及过电压防护设施,在接地网设计或施工前进行接地模拟试验是预测接地网接地参数、衡量接地体接地特性的常用方法。石墨复合接地材料、多层电镀接地体、扁状等一系列非圆柱形接地体在采用相似理论进行接地模拟试验时,经常面临多个相似项不能按照相似准则进行缩比的问题。首先采用量纲分析法,提出了考虑接地体的三维尺寸、接地体材料参数等相似项的接地模拟试验完全相似模型。随后,提出接地模拟试验中畸变相似项、畸变系数、单畸变相似模型以及多畸变相似项等概念,给出接地模拟试验畸变相似模型的数学表征法 ...
胡元潮 +5 more
doaj
Rare Metals, EarlyView.ABSTRACT Photocatalytic molecular oxygen (O2) activation provides a sustainable approach to produce singlet oxygen (1O2) for organic contaminants detoxification. However, the charge carriers‐involved pathway usually suffers from unsatisfactory 1O2 production efficiency owing to energy loss caused by photogenerated hole‐mediated superoxide species (•O2−
Yan‐Biao Shi +8 more
wiley +1 more source
Electronic structure and thermal transport properties of Chalcogenide mGeTe•nSb2Te3 compounds [PDF]
, 2015 在信息高速发展和能源加速枯竭的今天，寻找高效的新能源材料和信息存储材料迫在眉睫。在锗（Ge）、锑（Sb）、碲（Te）三元相图中，二元相GeTe和Sb2Te3连线上的一系列mGeTe•nSb2Te3（简称GST）化合物既是高效的热电转换材料，同时又能利用快速相变存储数据，具有非常广阔的应用前景。无论是作为相变存储材料还是热电材料，GST化合物中的热传导是影响其使用性能的至关重要的因素。材料的热传导是一个非常复杂的过程，研究者至今仍在寻找一种高效、准确、低成本和普适的测量方法。受限于测量技术 ...
潘元春
core
Rare Metals, EarlyView.ABSTRACT Nb‐Si‐based superalloys are considered as the most potential candidate materials for nickel‐based superalloys due to the lower density and higher using temperature. Here, a type of stable Nbss/γNb5Si3 bi‐phases structure with a coherent interface has been successfully designed. Additionally, the Nbss and γNb5Si3 phases showcase the orientation
Xiao‐Wei Wang +6 more
wiley +1 more source
A Study on Error Resilient Techniques for Video Coding [PDF]
, 2015 本文主要研究视频编码的容错技术，提高视频码流在互联网、无线网络等不可靠信道中传输的鲁棒性。研究对象包括单视点视频编码、双目立体视频编码和多视点视频编码。 在单视点视频编码研究方面，本文在H.264/AVC视频编码标准的基础上，分别从差错隐藏和差错恢复编码的角度提出了两种视频编码差错控制算法。（1）基于运动连续性和纹理相关性的丢失宏块差错隐藏算法（MCTC），该算法在解码过程中实现差错隐藏，无需对编码结构进行修改。（2）基于H.264/AVC和三维双树离散小波变换的分层多描述视频编码算法（HLMDVC ...
陈婧
core
Rare Metals, EarlyView.ABSTRACT Intervertebral disc degeneration (IDD) is a predominant cause of low back pain, significantly impacting quality of life. Mitochondrial fitness is essential in the progression of IDD, as it regulates cellular senescence and pyroptosis. This study investigates the role of mitochondrial caseinolytic protease P (ClpP) in alleviating senescence and
Kun Wang +7 more
wiley +1 more source
Evolution of Domain Structures of Epitaxial Ferroelectric Film under Different Electrical Boundary Conditions [PDF]
, 2015 本文采用基于金茨堡—朗道—德文希尔唯象理论的相场法，研究二维铁电薄膜畴结构的演化，并采用有限差分方法数值求解相场方程。首次提出了中间电学边界条件及其两类参数，并研究三种电学边界条件（中间电学边界条件、开路电学边界条件及短路电学边界条件）下铁电薄膜的畴结构及铁电性能。 结果显示，开路电学边界条件和短路电学边界条件下，薄膜畴结构有明显的尺寸效应。开路电学边界条件下，薄膜厚度较小时出现水平单畴结构；在临界厚度14nm处发生了水平单畴结构向多漩涡畴结构的转变；随厚度进一步增加，为了降低去极化电场能 ...
吴登阳
core
Rare Metals, EarlyView.ABSTRACT Internal oxidation has been identified as an effective method for enhancing the strength of AgMg alloys. However, the concurrent occurrence of embrittlement remains inadequately understood, thus limiting their broader application. This study investigates the oxidation behavior of AgMg alloys with Mg concentrations ranging from 1 at% to 7 at ...
Hai‐Cheng Zhu +12 more
wiley +1 more source
Rare Metals, EarlyView.ABSTRACT This study elucidates the oxidation mechanisms governing Y/Hf‐doped AlCoCrFeNiTi high‐entropy alloys (HEAs) and reveals the pivotal role of fabrication processes in dictating high‐temperature oxidation behavior. We demonstrate that casting and spark plasma sintering (SPS) promote Y/Hf segregation, resulting in heterogeneous oxide formation and
Huaqing Yi +5 more
wiley +1 more source
Probing and tunning the light-matter and electron-matter interaction in the quantum regime [PDF]
, 2016 对光子和电子与物质相互作用的探知与解读、相互作用行为的驾驭与改造是当今凝聚态物理研究的前沿热点，本论文面向该研究领域，以搭建实验平台为起步，以构建优良材料体系为基础，多方位发掘并呈现体系中的相互作用行为，旨在澄清其背后的物理图像与核心机制，并以此为支点，进一步开展更具目的性的量子行为调控。研究内容与研究意义可简要概括为如下几点： 开发新表征技术：我们首先致力于原位综合表征系统这一实验平台的搭建，并进一步发展了双扫描隧道探针表征技术，以及光纤探针配合下多探针协同的微区光学表征技术 ...
李孔翌
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