Results 71 to 80 of about 1,133,635 (178)
Shuitu Baochi Xuebao, 1995 对中国降雨侵蚀力Ｒ值的计算与分布进行了系统研究。主要内容包括Ｒ指标的确定；次降雨Ｒ失真、Ｒ值以及多年平均Ｒ值的简易计算方法；我国不同地区年Ｒ值的月分布、次分布、频率分布和年际变化特征，以及Ｒ值的雨量、雨强分布特征；对我国１４０多个重点站的Ｒ值进行了计算；在分析我国降雨侵蚀力Ｒ值区域分布特征的基础上，编制了中国降雨侵蚀力等值线图，进行了降雨侵蚀力分区。
王万中 张宪奎
doaj
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Tin‐based composite oxides typically undergo severe volume variations and exhibit poor intrinsic conductivities despite their high theoretical capacity as promising anode candidates for sodium‐ion batteries. This results in rapid structural degradation and capacity fading upon cycling.
Yongmei Sun +5 more
wiley +1 more source
330 kV GIS隔离开关操作过程中电磁干扰单脉冲波形特征规律研究
Gaoya dianqi气体绝缘开关设备中隔离开关操作产生的特快速暂态过电压是威胁二次设备安全运行的重要因素。为掌握VFTO特征分布规律，文中按照实际线路参数搭建330 kV GIS隔离开关模拟干扰源试验系统，模拟现场GIS隔离开关分合操作时产生的电磁干扰过程，通过核密度估计法对提取的VFTO单脉冲波形特征数据进行了全面的统计分析。结果表明，合、分闸时单脉冲的最大峰值分布呈3峰分布，最大峰值分别分布在[25.98，294.49] kV、[33.08，305.91] kV；合、分闸时的单脉冲的持续时间分布分别呈2峰分布和3峰分布，
梅冰玉 +5 more
doaj
四川大学学报. 自然科学版, 2015 通过对氟化氘(DF)化学激光器腔内气动流场的分析,建立了包括小信号增益系数分布和折射率起伏分布的非均匀增益分布模型,进而分析了化学激光器腔内非均匀增益分布对其模式特性的影响.采用增益介质多层分布法和Fox-Li迭代法,计算了具有非均匀增益分布的DF化学激光器有源腔本征模式分布,并利用功率谱密度(PSD)及Zernike像差系数对无源腔以及有源腔本征模式的相位特性进行了比较分析.研究结果表明:DF化学激光器腔内非均匀增益特性会引起其本征模式分布不均匀性和波前相位高频比例的增加 ...
马雪梅, 韩开, 张彬
doaj
Surface Reconstruction of Ce‐Ion‐Doped Fe‐MOF for Efficient Water Oxidation
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Surface reconstruction plays an important role in catalysts for the efficient oxygen evolution reaction (OER). In this work, we report the designed synthesis of the Ce‐ion‐doped Fe‐MOF (CFM) directly grown on nickel foam via a facile solvothermal route.
Fangfang Zhang +8 more
wiley +1 more source
Gaoya dianqi, 2006 建立数学模型计算了复合绝缘子的沿面电场分布,利用有限元法计算了220kV线路复合绝缘子不安装均压环及安装不同形状尺寸均压环时沿面场强分布和电位分布。分析了均压环各因素变化对电场分布改善效果的影响,指出环径和罩深对端部电压分布改善效果明显,管径对电场分布改善效果好,根据各因素的综合影响,推荐了220kV复合绝缘子均压环的结构参数。
卫李静 +5 more
doaj
Electrically Switchable Altermagnetism in Monolayer MoCl3
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Altermagnets intertwine spin‐split bands with vanishing net magnetization, offering great potential for high‐density, stray‐field‐free spintronic devices. However, their development is hindered by both material scarcity and difficulties in external control due to their intrinsic symmetry protection.
Zhengming Zhang, Zhenyu Fan, Dunhui Wang
wiley +1 more source
, 2007 根据耦合波理论,在分析分布反馈(DFB)光纤激光器纵模特性的基础上,着重阐述其偏振特性。另外给出了偏振态同耦合系数和双偏振态相移量差的关系。理论分析结果表明,当分布反馈光纤激光器输出为0阶模时,输出激光的偏振状态由耦合系数和双偏振态的相移量差共同决定,即在耦合系数一定的情况下,通过增加双偏振态相移量的差,或在双偏振态相移量差一定的情况下,通过减小耦合系数,可以实现单偏振输出。实验中在经载氢处理的掺铒光纤上制作分布反馈光纤激光器,由于耦合系数较大和双折射效应过小 ...
刘育梁, 李芳, 刘丽辉, 徐团伟
core
皮肤低阻点及其循经分布特征的微机检测——Ⅱ、皮肤低阻点的循经分布
, 1993 本文报道应用自行研制用于皮肤电阻抗检测的微机系统与对人体皮肤低阻点分布检测结果表明,皮肤低阻点分布基本上是循经的。实验证实此方法可靠 ...
黄晓卿 +4 more
core +2 more sources
Uncovering Cu Involved Nanophase Structures and Transformation in a Novel 7075B Aluminum Alloy
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT In this study, aberration‐corrected transmission electron microscopy combined with first‐principles calculations was employed to systematically investigate the Cu‐involved crystal structures and evolution mechanisms of nanoprecipitates in a novel 7075B Al alloy. Firstly, an atomic model of the early‐stage GP‐ηp structure together with specific
Deyu Zhang +13 more
wiley +1 more source