Results 1 to 10 of about 18,934 (117)
Dianci bileiqi, 2023 为了克服对套管进行固定周期停电检修的检修周期长、检修不精确等问题，探讨了高压套管的在线监测方案，给出了一种套管末端在线监测装置的设计方案，以保证及时发现套管设备绝缘缺陷，对保障电力系统安全运行具有重要意义。根据所设计的套管末端在线监测系统整体结构，介绍了监测系统中在线监测单元结构，以及在线监测单元结构中局部信号调理电路、高速采集电路以及电源功能电路的设计，最后通过测试实验，证明了在线监测系统可以实时监测高压套管运行状态，设计的在线监测装置具有稳定、准确、有效的特点。
谢佳 +5 more
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Dianci bileiqi, 2023 接地线是保护检修人员的一道安全屏障。在输配电线路上进行停电作业均须装设便携式接地线。针对便捷式接地线易受环境因素的影响，导致不能正确接地的情况。介绍了一种内置接地电阻检测仪的便捷式接地线装置。该装置基于STM32F4单片机并结合了卡尔曼滤波算法设计了可以实时检测接地电阻的便捷式接地线装置，通过通讯模块实时反馈接地电阻值到上位机判断便捷式接地线装置是否正确接地。便捷式接地线装置通过在无干扰下对阻值的检测，以及在不同频率干扰和土壤环境下的阻值检测。所得结果表明 ...
黄靖 +6 more
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Gaoya dianqi, 2022 在役GIS盆式绝缘子因材质性能欠佳、机械操作振动等原因会引入气隙、金属微粒等各类缺陷，若不通过诊断提前预警并及时处理，极有可能引起突发性故障。X射线检测作为一种重要的可视化检测方法，在应用于在役GIS盆式绝缘子时存在检测效率低、结果不直观、存在检测盲区等问题。文中设计了在役GIS盆式绝缘子的X射线检测智能定位装置，开发了GIS盆式绝缘子缺陷检测的三维成像技术。结果表明，文中开发的X射线三维成像技术，可实现成像板及射线机的自动升降和多角度旋转控制、三维图像的智能重构以及GIS盆式绝缘子的全覆盖照射 ...
张国宝 +6 more
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Lung cancer remains a major cause of cancer‐related mortality worldwide, and non‐small cell lung cancer (NSCLC) accounts for the largest proportion of diagnosed lung cancer cases. Exosomal programmed death‐ligand 1 (PD‐L1) has attracted increasing attention as a potential liquid‐biopsy biomarker associated with tumor immune regulation; however,
Chen Su +6 more
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Behavioral interventions to reduce demand for threatened freshwater turtles as pets
Conservation Biology, Volume 40, Issue 5, October 2026.Abstract Growing demand for freshwater turtles as pets has fueled illegal trade and accelerated wild population declines, underscoring the need for theory‐based demand‐reduction interventions. We conducted a three‐part randomized controlled trial with active turtle keepers (n = 1800) in China to test conservation‐ and legality‐framed messages by ...
Wuji Zheng +9 more
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Dianci bileiqi, 2023 输电线路表面存在金属污染物容易导致闪络现象，影响线路正常运行。目前针对线路污染物的检测，主要是在断电期间采样后，通过元素分析对样品进行离线检测，影响经济运行。针对此，笔者提出一种基于激光诱导击穿分析的金属污染物在线检测方法(LIBS),该方法具有无样品制备、几乎无损、速度快等优点。通过优化多种LIBS参数(激光能量和延迟时间),可获取更好的光谱数据分辨率，对金属污染物类型的辨识度更高；然后，结合校正曲线法和偏最小二乘回归法检测金属污染物的种类和质量分数。通过实验测试表明，本研究提出方法能准确、直接 ...
段家振
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Ultrasound in Obstetrics &Gynecology, Volume 68, Issue 2, Page 211-219, August 2026.ABSTRACT Objectives First, to evaluate whether the ratio of soluble fms‐like tyrosine kinase‐1 to placental growth factor (sFlt‐1/PlGF) is associated with hemodynamic changes in ophthalmic artery (OA) Doppler in near‐term pregnancy. Second, to assess the performance of OA Doppler to rule in and rule out angiogenic factor imbalance.
M. F. Tinajero +7 more
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Ultrasound in Obstetrics &Gynecology, Volume 68, Issue 2, Page 256-269, August 2026.ABSTRACT Objectives The primary aims of this study were to validate externally the diagnostic performance of the Assessment of Different NEoplasias in the adneXa (ADNEX) model for distinguishing between malignant and benign adnexal masses, when used by non‐expert ultrasound examiners in general gynecological settings with a low prevalence of ovarian ...
I. M. Dueholm Hjorth +11 more
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Hypertension at 5 months postpartum in women with gestational diabetes
Ultrasound in Obstetrics &Gynecology, Volume 68, Issue 2, Page 202-210, August 2026.ABSTRACT Objective Gestational diabetes mellitus (GDM) is associated with future maternal cardiovascular disease, independent of the development of Type‐2 diabetes mellitus. As a major cardiovascular risk factor, we examined the incidence and predictors of hypertension at 5 months postpartum in women with previous GDM.
C. Gómez Fernández +7 more
wiley +1 more source
Gaoya dianqi, 2005 气相色谱分析在检测变压器各类故障方面发挥了很重要的作用,但离线检测存在很多缺点,针对离线检测方法操作的繁琐性,介绍了一种基于气敏传感器的在线监测系统,论述了用监测两种气体来实现对变压器油中溶解气体在线监测的原因和方法,对气体传感器和气体在线监测的硬件设计和通信软件设计等进行了具体的分析和探讨。
张挺, 王章启, 魏天魁
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