Results 1 to 10 of about 3,325 (114)
Gaoya dianqi, 2022 为提高真空断路器分合闸性能和智能化操作水平，提出了适用于真空断路器电机操动机构的RBF-PID控制方法，结合有限转角永磁无刷直流驱动电机动态数学模型，分析了驱动电机转速响应特性和运动过程可控性，构建了电机操动机构神经网络控制方程，对PID控制参数进行优化整定，分别计算分析常规PID和RBF-PID控制方法作用下真空断路器操作速度的跟踪特性。研制了电机操动机构速度控制系统，开展了真空断路器电机操动机构速度跟踪特性实验，结果表明，采用RBF-PID控制方法可以有效降低速度跟踪误差 ...
史可鉴 +5 more
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Shuitu Baochi Xuebao, 2023 植被恢复是影响土壤有机碳库动态变化的关键过程之一,阐明植被恢复过程中土壤有机碳的固持动态及其驱动机制,是全球变化下碳循环研究的热点和前沿问题。本文综述了近年来国内外关于植被恢复过程中土壤有机碳固定动态及其驱动机制方面的研究,剖析植被恢复中土壤有机碳固持动态及其影响因素,探讨植物碳输入对土壤有机碳动态变化的影响机制,揭示植被恢复中土壤有机碳固定的物理、化学和微生物驱动机制,并对目前研究中存在的问题进行总结,进而提出关于植被恢复的土壤固碳效应研究,亟需在土壤有机碳组分的动态、微生物结构和功能,以及植物—土壤—
邓蕾 +3 more
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Gaoya dianqi, 2020 为了抑制断路器合闸操作过程中的触头过冲与反弹现象,改善电机操动机构输出特性,文中通过分析电机操动机构断路器触头合闸运动过程,计算得到断路器动触头行程与驱动电机负载转矩之间数学关系,利用分段控制策略对电机操动机构驱动电机输出转矩进行调节,实现触头过冲与反弹的有效抑制。研制以数字信号处理器（DSP）为核心的控制装置,开展126 kV真空断路器电机操动机构合闸操作实验,对实验过程中的触头行程多组数据进行对比分析。结果表明:驱动电机在转动0°～10°,10°～36°,36°～64°角度时分别采用调制占空比1,0.
李少华 +6 more
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Plant invasion in mountain ecosystems reduces soil micro‐food web complexity at higher elevations
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Anthropogenic activities have accelerated plant invasions in mountain ecosystems, impacting the structure and functions of native plant communities. Changes in above‐ground vegetation can drive shifts in below‐ground biota, yet the effects of plant invasions on soil ...
Runjie Jiao +8 more
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Intact coastal nursery rearing amid climate‐driven phenological shifts in threatened salmon
Conservation Biology, EarlyView.Abstract Literature linking phenology to climate has proliferated in recent decades and shows that climate change has reorganized seasonal opportunities worldwide. However, this literature often quantifies changes in point measures of timing (e.g., beginnings and peaks) without context about duration (e.g., rearing season length) or performance (e.g ...
Stuart H. Munsch +8 more
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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
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Gaoya dianqi, 2020 为了减小驱动电机换相转矩波动对真空断路器动触头运动速度的影响,提出一种换相期间PWM调制电机驱动回路开关管的方法。根据电机操动机构的工作原理,计算得到断路器动触头运动速度与电机输出转矩之间的数学关系,同步调节换相过程中各开关管触发信号PWM的占空比,减小输出转矩下降幅度,提高动触头运动速度。真空断路器电机操动机构联机实验结果表明,换相期间采用PWM调制的动触头运动速度整体得到提升,断路器平均合闸速度提高了0.21 m/s。
庚振新 +7 more
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Resource Substitution: Local Governments' Issue Attention and Policy Reinvention
Policy Studies Journal, EarlyView.ABSTRACT Research on policy reinvention, where a government modifies rather than replicates policy innovations introduced by other governments, has progressed significantly, but how it is influenced by the government's issue attention has not been thoroughly examined.
Yingxin Zhang, Yixue Yao, Kaifeng Yang
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Wearable sweat sensors face persistent trade‐offs between multiplexed detection, signal stability, and wearing comfort. Here, we present a Janus electronic skin (e‐skin) with dual‐mode functionality, offering both thermal and moisture comfort.
Zhi‐Mei Mu +12 more
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Developing rapid, precise gas sensors for Listeria monocytogenes (LM) biomarker detection faces challenges due to suboptimal gas‐solid interactions. Herein, we report the rational synthesis of amino‐functionalized mesoporous SiO2 hollow nano‐doughnuts (MS‐2‐NH2‐2) via modification with (3‐aminopropyl) trimethoxysilane (AAPTMS), which enables ...
Xingyu Wang +7 more
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