Results 21 to 30 of about 4,283 (109)
Gaoya dianqi, 2023 为了开展用于新型电力系统的储能电站构网型性能调试，文中开发了适用于构网型储能系统的移动式调试平台。论文提出了适用于高电压等级构网型储能系统调试的35 kV四象限功率单元拓扑结构，在基于跟网型储能调试系统控制策略的基础上，提出了适用于构网型储能系统调试平台的复合控制策略，满足了新型电力系统构网调试的快速响应需求；结合现场调试，对复合控制策略的控制特性进行了分析，验证了构网型储能系统调试平台系统和所提复合控制策略的有效性；在百兆瓦级储能电站，现场测试了所设计的移动调试平台构网型功能 ...
闫涛 +5 more
doaj
International Journal of Applied Linguistics, Volume 36, Issue 2, Page 979-994, May 2026.ABSTRACT Previous research has established the relationships between motivation, anxiety, teachers’ support, and self‐regulated learning (SRL) in English‐as‐a‐foreign‐language (EFL) learning. Most of the studies, however, have taken a variable‐centered approach in addressing the variable correlations, while learners’ characteristics and variable links ...
Yuhong Jiao, Barry Bai, Jing Li
wiley +1 more source
He jishu上海硬X射线自由电子激光装置X光束传输距离超过1 km，反射镜的角度振动对实验站样品处的光斑影响很大。本文旨在探讨动力吸振器在减小反射镜角度振动的可行性。针对反射镜角度14.6 Hz的环境振动，设计了一个可变刚度的动力吸振器，将其应用于上海硬X射线自由电子激光装置的反射镜调节系统中，以期实现该频率的振动抑制。实验结果表明，通过将动力吸振器的频率调至14.6 Hz，反射镜调节系统14.6 Hz的振动从154 nrad降低至27.9 nrad，其他频率的振动基本无明显变化，整体反射镜角度的振动从193.2 ...
袁 浩然 +6 more
doaj +1 more source
International Journal of Applied Linguistics, Volume 35, Issue 1, Page 274-290, February 2025.Abstract Metacognitive regulation refers to learners’ ability to use a repertoire of metacognitive strategies to guide, observe, and manage thoughts, actions, and emotions in learning activities. It has been widely acknowledged as a significant predictor of language learning success, including writing.
Wandong Xu, Xinhua Zhu
wiley +1 more source
Integrative Conservation, Volume 3, Issue 3, Page 230-243, September 2024.Tropical secondary forest at early sucessional stage had higher diamter growth rate and mortality rate, however, these forests also are more risked to droughts and high temperatures. Rising temperatures and more frequent droughts may decrease the carbon sink capacity of tropical forest ecosystems. Abstract Tropical forests are major carbon sinks on the
Sai Tun Tun Oo +11 more
wiley +1 more source
Infant Mental Health Journal: Infancy and Early Childhood, Volume 45, Issue 2, Page 135-152, March 2024.Abstract This study, conducted in Germany, examines the role of maternal soothing strategies to explain the association of maternal self‐efficacy with infant regulation (crying and sleeping behavior). Questionnaire data of 150 mothers, living in Germany, with mixed ethnic and educational backgrounds were collected when infants were 3 and 7 months old ...
Natalie Kiel +6 more
wiley +1 more source
Integrative Conservation, Volume 3, Issue 1, Page 36-45, March 2024.Threatened and endangered species that occur in coastal areas are susceptible to the impacts of hurricanes that can destroy and reorganize their habitats. We used long‐term tracking of endangered beach mice to reveal they survive these impacts by using high elevation dune habitats to stay safe.
Michael V. Cove +5 more
wiley +1 more source
Guangtongxin yanjiu, 2016 为了扩大OEO（光电振荡器）的频率可调谐范围,利用Matlab软件仿真设计了一种基于Chirped PS-FBG（啁啾相移光纤光栅）的频率可调谐OEO。对PS-FBG（相移光纤光栅）的反射谱和基于PS-FBG的频率可调谐范围进行了理论和仿真研究,分析了Chirped PS-FBG的反射谱和基于Chirped PS-FBG的频率可调谐范围。仿真结果表明,通过对可调谐激光源的波长调节可实现频率可调,与PS-FBG相比,Chirped PS-FBG扩大了反射谱带宽及OEO的频率可调谐范围。
韩晓晓, 徐恩明, 王斐, 陈诚
doaj
Gaoya dianqi, 2023 振荡型雷电冲击具有产生效率高、易于调波的特点适合在现场试验应用。文中针对配电变压器的参数和结构特点，提出振荡型雷电冲击电压的产生方法，研究了波形影响因素和现场调波方法。在仿真的基础上，在10 kV配电变压器上开展试验。结果表明，配电变压器振荡型雷电冲击试验可以采用低压开路的接线方式获得满足标准要求的振荡型雷电冲击波形。通过调节调波电感可以改变振荡型冲击电压波前时间和振荡频率，调节波头电阻和波尾电阻可以改变波尾时间。利用文中所研究方法，可以在配电变压器上产生符合IEC 60060-3 ...
倪浩 +5 more
doaj
Guangtongxin yanjiu, 1976 <正> 晶体管载波没备中的自动电平调节装置基本上都使用热电式的,即调节放大器中采用热敏电阻作为增益（或增益频率特性）的可调元件。自动调节时,将收到的导频与参考电平比较,并将其误差予以放大之后作为热敏电阻的加热电流,使其阻值变化而改变放大器的增益,达到调节的目的。这个闭环回路通常如图1所示。
陈斌秋
doaj