Results 21 to 30 of about 23,616 (116)

Leaf C:P ratio as a universal indicator of photosynthesis in subtropical woody species: Stoichiometric thresholds and metabolic trade‐offs

open access: yesFunctional Ecology, Volume 40, Issue 7, Page 2332-2344, July 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract The stoichiometric ratios of carbon (C), nitrogen (N) and phosphorus (P) serve as important indicators for assessing nutrient balance in forest ecosystems, but their relationships with photosynthetic dynamics require deeper characterization.
Minghao Chen   +9 more
wiley   +1 more source

特高压支柱式电气设备地震响应有限元分析关键动力参数取值

open access: yesDianci bileiqi
对电气设备地震动响应分析应用较多的主要有两种方法——振型分解反应谱法和动力时程法,其中某些关键动力参数的取值在电气设备抗震相关规范中并没有具体规定,实际分析时往往凭个人经验,致使分析结果因人而异、不尽准确。为了在计算分析阶段通过对关键动力参数准确取值,尽可能真实获取结构动力响应,本研究以特高压支柱式电气设备颇具代表性的两种材质的结构本体及加装减隔震装置后的结构为分析对象,在非线性时程分析方面,通过对动力时程法主要参数:振型参与阶数、地震波及峰值加速度的影响对比分析 ...
陈忆前, 潘飞, 彭伟, 刘洋
doaj   +2 more sources

圆端形钢管混凝土构件的偏拉力学性能研究

open access: yesJianzhu Gangjiegou Jinzhan, 2020
基于有限元软件ABAQUS进行数值模拟,研究圆端形钢管混凝土构件的偏拉力学性能,有限元模拟结果和试验结果吻合较好。基于有限元模型开展机理分析和参数分析,机理分析表明:在偏拉状态下,圆端形钢管混凝土构件呈现出较高的承载能力;圆弧段钢管可有效约束核心混凝土,由于核心混凝土的支撑作用使钢管的抗拉承载力得到显著提高。参数分析表明:钢管强度、含钢率、混凝土强度和截面高宽比等参数对圆端形钢管混凝土构件的拉-弯相关曲线形状没有显著影响。基于参数分析建议了圆端形钢管混凝土构件偏拉承载力的计算公式 ...
郝怀霖, 王志滨, 吴泓均
doaj  

Flexible parental care in a songbird correlates with sex‐specific responses to seasonal phenology, mating opportunity and reproductive success

open access: yesJournal of Animal Ecology, Volume 95, Issue 7, Page 1178-1193, July 2026.
This population‐comparative study reveals that male and female parents respond differently to social and ecological conditions. This sex‐specific responsive strategy is related to the incongruent parental care systems across populations in Chinese penduline tits.
Jia Zheng   +5 more
wiley   +1 more source

EPR核电站安全壳钢衬里模块化吊装优化分析

open access: yesJianzhu Gangjiegou Jinzhan, 2013
研究分析了欧洲第三代核电站(EPR,European Pressurized-water Reactor)核岛安全壳钢衬里的模块化吊装。首先研究了环形桁架在进行钢衬里吊装时最不利竖向荷载下的受力性能;其次对钢衬里吊装环形桁架进行了参数优化分析,研究环形桁架的不同参数变化对桁架性能的影响,确定出环形桁架的优化参数取值;最后对某核岛安全壳钢衬里穹顶吊装时的各项受力性能进行了研究,包括吊装受力分析、风荷载作用分析及吊耳节点有限元分析,并提出了一些参数的取值及吊装方案的合理建议,为工程施工设计提供了参考。
叶垚   +4 more
doaj  

The vesicle trafficking R‐SNARE VAMP714 connects auxin responses, ROS and ion homeostasis in Arabidopsis under salt stress

open access: yesNew Phytologist, Volume 251, Issue 1, Page 207-227, July 2026.
Network of VAMP714‐dependent interactions during salt stress. Summary Plant responses to salt stress include an altered root architecture mediated by ion imbalances, reactive oxygen species (ROS) accumulation, and altered hormonal responses. Auxin is implicated in these processes.
Jialei Sun   +3 more
wiley   +1 more source

基于改进最小二乘法的超级电容器特征参数辨识

open access: yesGaoya dianqi, 2016
准确辨识超级电容器特征参数值是分析超级电容器电气特性和估计其健康状态的重要研究基础。为克服采用阻抗谱分析法辨识特征参数所需激励信号幅值过小,且不能反映研究对象真实工况以及难以实现在线辨识特征参数的缺点,文中采用递推最小二乘法解决此问题。基于实验分析结果发现直接采用该算法辨识出的参数值与真实值差异较大,因此在深入分析辨识算法的基础上,对最小二乘法的辨识结构加以改进。实验和仿真分析结果表明,基于改进后的最小二乘法辨识得到的超级电容器特征参数值更加准确和可信。
赵洋, 孙家南, 姜鸣
doaj  

Cross‐Border Online Radicalization Among Teenagers: Evidence From a Brazilian Case Study

open access: yesPolicy &Internet, Volume 18, Issue 2, June 2026.
ABSTRACT This article examines the theme of transnationality in online radicalization processes through an empirical case. It focuses on a group called ‘The Kiss’, led by a Portuguese teenager (Micazz) who encouraged individuals to carry out acts of violence in Brazil in 2023.
Quésia Pereira Cabral   +1 more
wiley   +1 more source

威布尔分布在高压开关产品运行数据分析中的应用

open access: yesGaoya dianqi, 2017
电网的发展对高压开关产品的可靠性提出更高的要求。SF6气体泄漏是导致高压开关缺陷和故障最重要的因素之一,以某省110 kV断路器SF6气体泄漏运行数据为基础,研究了高压开关产品的可靠性数据分析方法。对运行数据的统计分析结果表明,SF6气体泄漏数据能够用威布尔分布模型进行分析描述。进一步对威布尔分布的参数进行了参数估计,并将参数估计结果与统计直方图进行对比,证明了参数估计结果的有效性。基于此,最后对高压开关产品SF6气体泄漏的寿命情况进行了分析,并给出了针对高压开关产品密封结构的基本运维策略。
刘宇   +6 more
doaj  

Parameters setup of AC CMOS gates(交流CMOS门电路参数的设定)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2002
CMOS门电路的参数是对它本身物理特性的一种定量描述,对参数的设定是实际应用CMOS门电路的基础. 本文从理想参数出发归纳了直流CMOS门电路主要参数的设定思想并对各项参数进行了分析讨论.然后介绍了交流CMOS门电路的设计思想及结构与工作原理上的特点.在分析二类CMOS电路差异的基础上,本文采用类比的方法对交流CMOS电路的设定进行了研究.
LIUXiao(刘晓), WUXun-wei(吴训威)
doaj   +1 more source

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