Results 101 to 110 of about 106,323 (223)
Dianci bileiqi, 1991 金属氧化物避雷器的能量吸收能力取决于其它元件的温度。预测温度的一种有价值的方法是计算机模拟计算,但必须要有精确的参数。本文提出一种确定这种参数的方法。以前的方法用公式计算所要求的热参数。本文提出采用一次试验的方法提供参数。采用灵敏度分析法评估了参数值的系统误差 ...
doaj
Gaoya dianqi, 2005 传统的无差拍控制是精确数学模型的控制方法,其控制特性受系统参数变化影响较大。为了提高系统的跟踪准确度,笔者提出在线辨识参数的改进无差拍控制策略。分期实时地修正控制参数,使其对系统参数的变化具有良好的适应性,从而有效地改善了系统的跟随性能。
陈继侠, 陈晓东, 孙辉
doaj
基于ANSYS Maxwell通信基站铁塔电感参数仿真研究与验证
Dianci bileiqi, 2021 为研究雷击作用下通信基站铁塔的精确电感参数,基于电磁场有限元原理,使用实际通信基站铁塔参数建立了仿真模型。根据铁塔部件连接特点,考虑不同规格和位置,对角钢塔外自感和部件间互感进行了有限元仿真分析,并对仿真结果进行了实验测试验证。得到不同规格、不同位置角钢部件的单位长度自感参数和互感参数,以及不同内部结构情况下的一段铁塔自感参数,并通过仿真进一步分析得出铁塔电感参数变化规律。有限元法与实验结果的一致性验证了有限元法的正确性。相关结论为后续通信基站铁塔的分流特性分析和耐雷水平分析提供电气参数依据 ...
赵晓雨 +4 more
doaj
Political Trust and Aspirations to Influence Social Media During a Crisis: A Longitudinal Study
Policy &Internet, Volume 18, Issue 1, March 2026.ABSTRACT This study investigated how political trust shaped citizens' aspirations to influence others on social media during a COVID‐19 pandemic. Using four‐wave longitudinal survey data (2017–2021; N = 2172) collected from 543 citizens in Finland, we first analysed how political trust moderated the temporal development of individuals' aspirations to ...
Aki Koivula +2 more
wiley +1 more source
Breaking Down Social Capital: Urban Families' Use of Public Benefits
Poverty &Public Policy, Volume 18, Issue 1, March 2026.ABSTRACT This article examines whether social capital facilitates or dissuades urban families from taking up safety net programs. Using longitudinal data from the Future of Families and Child Wellbeing Study, we explore how various components of social capital—operating at relational, organizational, and neighborhood levels—are related to participation
Denia Garcia
wiley +1 more source
Gaoya dianqi油中溶解乙炔作为电力变压器中重要的放电程度表征参量之一，对其进行多步预测可以为变压器故障诊断及预警提供重要依据。现有的状态预测模型主要集中于单步预测，对于未来更长时期变化趋势的预测手段不足。此外，基于深度学习的多步预测模型的超参数选择大多基于经验和朴素的单一控制变量法，超参数之间的耦合关系没有得到充分的研究。文中提出基于多输出策略的门控循环单元（gated recurrent unit，GRU）神经网络多步预测模型，通过改变模型结构超参数和训练超参数研究超参数之间的耦合关系 ...
赵军 +6 more
doaj
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT The Schottky barrier height (SBH), which serves as a pivotal determinant of charge carrier injection efficiency in electronic devices, critically governs electrical behavior at metal/semiconductor interfaces. However, pronounced metal‐induced gap states at metal contact interfaces induce Fermi‐level pinning, which constrains the ...
Xiaofei Liu +10 more
wiley +1 more source
Factors influencing thrombelastography in pregnancy. [PDF]
Zhong Nan Da Xue Xue Bao Yi Xue Ban, 2023 Cao Y, Liang T, Peng J, Zhao X.
europepmc +1 more source
Interface Issues of Inorganic Solid‐State Electrolytes in Secondary Magnesium Batteries
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Solid‐state magnesium batteries (SSMBs) have gained significant attention as promising candidates for next‐generation safe energy storage systems because of the abundance of magnesium (Mg) in the earth's crust, superior energy density, and inherent nonflammability.
Jiren Wang +9 more
wiley +1 more source