Results 121 to 130 of about 1,579,839 (226)
Gaoya dianqi, 2019 为弥补目前仿真计算和变压器整机试验对特高压变压器饱和励磁特性研究的不足,选取进口和国产的高磁感取向硅钢片分别进行标准试样的基础磁性能测试,并分别搭建与特高压变压器结构相同、磁通密度等效的变压器铁心模型,基于该模型建立变压器饱和励磁特性检测系统,对测试得到的标准试样的基础磁性能和变压器模型的过励磁特性进行了研究和分析。结果表明:特高压变压器硅钢铁心模型在过励磁条件下,变压器模型的励磁特性与标准试样的基础磁特性变化的关系不完全符合计算公式;电压波形能保持基本的正弦波形态,空载电流畸变严重 ...
陈宇 +4 more
doaj
Floral bilateral symmetry: one axis, many details
New Phytologist, EarlyView.Dorsal petal morphological diversity among monkeyflower species. Summary Symmetry is a major component of floral diversity. Most flowers are radially or bilaterally symmetric, with bilateral symmetry (monosymmetry) having evolved repeatedly from radial ancestors. Since the identification of the dorsal identity gene CYCLOIDEA (CYC) in snapdragon, floral
Ya Min
wiley +1 more source
Gaoya dianqi, 2015 对用于断路器机械特性测试的几种位移传感器原理进行了阐述,针对中压断路器机械操动机构结构紧凑的特点,对影响中压断路器机械特性监测精度的因素进行了分析。设计了抗干扰能力强的传感器信号检测电路,通过机械特性性能测试试验和机械寿命试验证明:旋转编码器和激光位移传感器这两种位移传感器是中压断路器机械特性监测的理想传感器,在不影响断路器原有性能参数及可靠性的情况下,不但能真实地反映其行程特性,而且能够在高电压、大电流、强冲击振动的恶劣环境下长期稳定工作。
张显聪 +6 more
doaj
Journal of Critical Infrastructure Policy, Volume 8, Issue 1, Spring/Summer 2027.ABSTRACT Epistemic orphaning, responsibility drift, loss of institutional memory, and non‐stationarity are not new problems in infrastructure governance—they have accompanied long‐life infrastructure throughout its history. What artificial intelligence changes is not the existence of these problems but their scale, opacity, and the structural ...
Priscilla P. Nelson
wiley +1 more source
Pollution and Haunted Eco‐Histories: Silent Hill and Silent Horrors in Centralia, Pennsylvania
Popular Culture Review, Volume 37, Issue 2, December 2026.ABSTRACT Centralia is a former mining town and borough in Northeastern Pennsylvania, whose population has been steadily declining since the Mine Fire of 1962—a fire that still burns today. The “horrors” of living in Centralia are reflected in horror media set in postindustrial mining towns like Silent Hill.
Maz Jardon
wiley +1 more source
Gaoya dianqi, 2019 为研究配弹簧操动机构真空断路器在空载条件下的机械特性,文中以72.5 kV真空断路器为研究对象,分析了影响真空断路器机械特性的关键零件,建立了真空断路器的Adams与MATLAB联合仿真模型并完成了动力学仿真。仿真所得机械特性曲线与试验曲线吻合,证明了仿真的准确性,并在此基础上对真空断路器机械特性进行优化,为研究真空断路器空载条件下的机械特性提供了有效的手段。
刘超, 赵伟涛, 张强, 刘旭旭
doaj
, 2005 应用多种光谱手段研究了分子束外延生长在半绝缘的(001,GaAs衬底上的低氮含量的GaNAs中三元合金态的光学特性.变温PL谱揭示了合金态的本征特性以及其与氮的杂质态的根本区别,而脉冲激发的光荧光谱则进一步显示了合金态的本征光学特性 ...
孙炳华, 罗向东, 徐仲英
core
Governing for Digital Resilience: Rethinking Inclusion for WSIS+20 and Beyond
Policy &Internet, Volume 18, Issue 4, December 2026.ABSTRACT At the WSIS+20 juncture, this article asks what conditions enable individuals to participate meaningfully in digital life, and how governance arrangements should be assessed accordingly. Multistakeholder governance has distributed authority across actors, but not necessarily the capacity to shape or respond to digital conditions. We argue that
Audrey Yue, Jun Yu, Renae Sze Ming Loh
wiley +1 more source
, 1994 用微量炸药接触爆炸的方法,研究了钨合金93W-4Ni-3Fe在高加载率条件下的断裂特性,通过宏、微观观察,以及与静态断裂特性相比较,发现随着加载率的增加,钨-钨界面裂纹增加 ...
周益春 +3 more
core +1 more source
[Listeria Balanced Lethal Systems Expressing Cervical Cancer Antigen Genes: Construction and Basic Biological Characteristics]. [PDF]
Sichuan Da Xue Xue Bao Yi Xue Ban, 2023 Ou Q +5 more
europepmc +1 more source