Results 11 to 20 of about 7,493 (118)
Dizhen xuebao, 2022 研究不同时频特性的地震波作用下，抗震结构和隔震结构耦合设备的动力响应，对五层钢框架振动台模型试验数据进行小波分析。结果表明：主结构动力响应与地震波时频特性直接相关；由于主结构和隔震支座的滤波作用，设备的动力响应受地震波时频特性影响显著，但不具有直接相关性；隔震结构可以使设备的频率远离主结构的频率，从而降低设备的放大系数；设备耦合之后主体结构加速度的变化趋势取决于不同时频特性的地震波能量分布。
Miao Han +3 more
doaj +1 more source
基于逐次变分模态分解的飞轮-火电一次调频控制策略 [PDF]
全球能源互联网随着新型电力系统的大力建设与推广，火电机组面临的调频压力增大，提出一种逐次变分模态分解的飞轮-火电一次调频控制策略。首先，以飞轮储能和火电机组为研究对象，建立考虑新能源占比的飞轮-火电一次调频模型；其次，将一次调频功率指令利用逐次变分模态方法分解，由火电机组响应分解后的低频功率指令，同时设计飞轮储能下垂优化控制方法，实现飞轮储能与火电机组响应频率变化的协同控制；最后在不同工况下仿真验证，结果表明所提策略可有效避免火电机组一次调频时的频繁出力，减小火电机组响应频率变化时的调控要求 ...
张萍, 刘海涛
doaj +1 more source
全球能源互联网面对新型电力系统的低惯量趋势，规模庞大而位置分散的温控负荷在参与电力系统频率响应的同时，能够为电网提供虚拟惯量和一次调频支撑将是提升电网频率安全的新思路。为此，以集中-分布式调控框架下的温控负荷集群为研究对象，首先在详细分解控制层调控中心、协调层聚合商、响应层温控负荷终端三者在辅助调频过程中的采样、计算、控制、执行一系列实时任务的基础上，设计了事件触发与时间触发相结合的温控负荷集群终端异步响应机制，实现温控负荷集群功率遵从综合惯性控制律的效果。随后 ...
周特 +6 more
doaj +1 more source
Predictive evolutionary genomics: principles, validation, and practice
New Phytologist, Volume 252, Issue 1, Page 36-48, October 2026.Summary Climate change and habitat loss are driving rapid evolutionary responses in populations world‐wide, which creates an urgent need for evolutionary forecasting in conservation and agriculture. Such forecasting can be categorized into three time scales: trait‐based models that use multivariate quantitative genetic equations to project correlated ...
Daniel Ortiz‐Barrientos +5 more
wiley +1 more source
Neutral interactions among non‐native plants are common
New Phytologist, Volume 252, Issue 1, Page 292-309, October 2026.Global distribution of studies and overall effect of co‐invasion for all metrics of non‐native plant performance combined. Summary Globalization has accelerated the establishment of non‐native plant species, increasing the prevalence of multispecies co‐invasions; yet interactions among co‐invaders remain poorly understood.
Feng He +7 more
wiley +1 more source
Uncovering correlates of decline and critical refuges for a threatened terrestrial mammal
Conservation Biology, Volume 40, Issue 4, August 2026.Abstract Globally, the geographic ranges of numerous species are contracting. Identifying spatiotemporal patterns of threat impact can illuminate why species decline in some parts of their range but persist in others. We developed a correlative approach to identify species’ response thresholds and locate ecological refuge areas associated with ...
Natalya M. Maitz +5 more
wiley +1 more source
Gaoya dianqi, 2023 油纸绝缘套管作为变电站内极为重要的电力设备之一，其绝缘状态对于电力系统的安全稳定运行至关重要。频域介电谱法可实现套管绝缘状态的无损检测，但传统扫频测试耗费时间长，为频域介电谱的现场应用带来不便。文中提出一种冲击电压激励下变压器套管介电响应快速测量方法，利用冲击电压信号中包含的丰富频率分量作为激励信号，获取套管末屏响应电流并进行数据处理与计算，从而得到频域介电响应信息。文中基于扩展德拜模型，搭建冲击电压激励下介电响应仿真平台，并利用任意波形发生器、高压功率放大器等设备搭建实验测试平台 ...
张璐 +5 more
doaj
International Journal of Applied Linguistics, Volume 36, Issue 3, Page 2808-2821, August 2026.ABSTRACT This study investigates how the learner‐related factors of language dominance, encompassing language history, proficiency, use, and attitude, modulate congruency effects in multi‐word unit (MWU) processing among early bilinguals. Seventy Cantonese–Putonghua bilinguals completed lexical decision tasks measuring reaction time and accuracy for ...
Mingjia Cai, Yuan Liang
wiley +1 more source
Journal of Adolescence, Volume 98, Issue 5, Page 1715-1736, July 2026.ABSTRACT Introduction Following rapid iterations in media technologies, Chinese millennials (born between 1980 and 1995) find themselves in a paradoxical state where digital saturation exists alongside fatigue, making them central practitioners of digital minimalist behavior.
Chao Zhang, Yinze Hao, Jingwen Li
wiley +1 more source
Gaoya dianqi, 2017 通过试验研究了频率响应分析法检测变压器绕组变形。首先分析了频率响应分析法检测变压器绕组变形的基本原理。建立了频率响应分析法试验平台,分析了影响频率响应分析法检测绕组变形结果的主要因素。结合相关系数法对两个典型算例变压器绕组进行了变形诊断分析。通过对变压器的频率响应测试数据比较分析,结果表明了用频率响应分析法判断变压器绕组变形仍存在一定的局限性。
张海军, 王曙鸿, 刘艳琴
doaj