Results 81 to 90 of about 2,255 (128)

基于电流监测和动态电阻分析的电容器组SF6断路器电寿命评估系统

open access: yesGaoya dianqi
电容器组SF6断路器电寿命状态监测工作对保障电网安全可靠运行意义重大。文中融合触头磨损计算方法和动态电阻分析法对SF6断路器电寿命进行评估,提出SF6断路器电寿命评估判据,首先基于断路器电流监测数据计算断路器触头磨损,对断路器电寿命状态进行判断预测,再利用动态电阻分析法印证判断出SF6断路器的真实状态,兼顾触头磨损计算法的实时性和动态电阻法的准确性。基于所提判据,研发了一套融合触头磨损和动态电阻的SF6断路器电寿命评估系统。该系统可基于断路器投切数据和动态电阻准确地评估SF6断路器的电寿命 ...
陈磊   +5 more
doaj  

Life<b>'</b>s Essential 10 and brain health: A prospective cohort study. [PDF]

open access: yesZhong Nan Da Xue Xue Bao Yi Xue Ban
DU Y   +12 more
europepmc   +1 more source

季节性载荷对系泊系统疲劳寿命的影响研究

open access: yesHaiyang gongcheng zhuangbei yu jishu
浮式生产储卸油装置(FPSO)的系泊系统对其海上稳定定位至关重要。由于系泊系统在服役期间需持续承受数十年复杂海况作用,因此构件疲劳成为影响其安全性和可靠性的关键因素。旨在研究考虑季节性载荷特征的系泊系统疲劳寿命评估方法。首先,基于实测监测数据,开展了系泊系统疲劳寿命评估方法研究。通过对我国南海某特定海域长期风、浪、流数据的深入分析,发现该海域环境载荷呈现显著的季节性变化规律,这对于准确评估系泊系统构件的疲劳寿命至关重要。因此,在疲劳寿命评估模型中引入了季节性载荷特征,以更精确地模拟实际海况并评估疲劳寿命。
刘诗学
doaj  

[Analysis of the disease burden of Burkitt lymphoma in China from 1990 to 2021]. [PDF]

open access: yesZhonghua Xue Ye Xue Za Zhi
Zheng CH   +8 more
europepmc   +1 more source

[Disease burden and trends of preterm birth in China from 1990 to 2023]. [PDF]

open access: yesZhongguo Dang Dai Er Ke Za Zhi
Lin R, Li PP, Lan CY, Zheng Z, Lin XZ.
europepmc   +1 more source

[Trends in burden of osteoporosis in China from 1990 to 2023 and analysis of epidemiological factors]. [PDF]

open access: yesZhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Wu Y   +5 more
europepmc   +1 more source

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