Results 61 to 70 of about 8,626 (169)
Ecology and Evolution, Volume 15, Issue 10, October 2025.This paper proposes a ‘relaxed’ point‐count survey method to enhance accessibility and expand geographic coverage by easing these constraints. Surveys can be conducted in diverse locations, including urban areas and travel routes, within flexible timeframes (e.g., 6 h after sunrise or during the evening) and with adaptable spacing between survey points,
Masumi Hisano
wiley +1 more source
Design and Implementation of Online Monitoring System for HVDC Breaker Based on GPRS and PAC [PDF]
, 2014 近年来随着我国坚强智能电网的快速建设和发展，越来越多的系统应用环节需要使用远程在线监控技术，人们对远程监控的实时性、可靠性和功耗的要求也越来越严格。高压直流开关作为高压直流输电网络中的重要组成部分，对它的各项基本参数和运行状态参数的测量也一直是直流输电技术的研究难点之一，主要原因在于：（1）信号采集困难：它是高压设备，作用时会释放巨大的能量；（2）信号传输困难：设备处于高压运行环境，与地面存在较大的绝缘间隔，无法使用有线通讯传输方式；（3）参数无法直接获得：设备自身没有相应的信号传感设备 ...
许登华
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Gaoya dianqi, 2013 输电线路覆冰会影响电网的安全稳定运行,国内外对于输电线路覆冰在线监测进行了很多研究,笔者旨在分析当前覆冰在线监测系统的研究成果。首先,讲述了国内外关于输电线路覆冰过程预测的模型,包括基于热力学机理、流体力学机理和实测数据模拟等建立起的数学模型,并分析对比了其优缺点;其次,介绍了目前覆冰导线在线监测技术,包括视频监测技术、力学载荷计算监测覆冰厚度、倾角变化监测弧垂等技术;最后,指出了现有覆冰监测技术的一些不足之处,并提出了一些改进意见。
王黎明 +3 more
doaj
Impact of race‐based customization on detection of fetal growth restriction
Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 4, Page 480-485, October 2025.ABSTRACT Objective Fetal growth standards determine which fetuses are diagnosed with fetal growth restriction (FGR) and become candidates for enhanced fetal monitoring. Given the existence of race‐based differences in fetal and neonatal weights, we sought to determine the impact of race‐based customization of fetal growth curves on the antenatal ...
P. Ramesh, L. Lemon, J. C. Larkin
wiley +1 more source
Study on Vibration Characteristic of Operational Bridge Based on Monitoring Data [PDF]
, 2016 桥梁结构监测系统能够对结构进行实时自动的状态监测，为评价运营桥梁的承载能力、使用功能和安全可靠性提供数据基础。近年来因为缺乏科学监测与管理所引起的桥梁垮塌事故频频发生，因此有必要利用监测数据对重要大桥的结构运营状态进行评估。本文基于厦门天圆大桥结构监测系统的实测数据，对单拱肋中承式梁拱组合桥型的振动特性进行研究，重点包括大桥的模态参数识别与短吊杆疲劳寿命估计两方面。本文主要工作内容如下： 首先，阐述了桥梁结构监测系统与模态分析方法的发展现状，总结了中承式拱桥结构特点与短吊杆疲劳问题 ...
何文朋
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Dianci bileiqi, 2014 输电线路覆冰威胁着线路稳定运行。现有覆冰在线监测装置监测传感器为有源器件,信号传送均为电信号传输,易受到电磁干扰且装置工作稳定性较差。笔者设计了一种基于光纤布拉格光栅传感器的输电线路在线覆冰监测装置,并在110 kV震走线44号塔进行了挂网试运行。试验结果表明,研制的光纤布拉格光栅传感器单元线性度高,灵敏度较好,覆冰在线监测装置运行稳定,监测数据准确。
邓元实 +4 more
doaj
Community‐informed and codesigned research to understand the impacts of railways on wildlife
Conservation Biology, Volume 39, Issue 5, October 2025.Abstract Trains cause mortalities of several animal species, but the ecological impacts of railways are understudied. Most research on wildlife–train collisions has focused on large mammals, but understanding railway‐specific risks for underrepresented taxa, especially vulnerable species, is important for developing effective mitigation strategies ...
Kyle D. Vincent +5 more
wiley +1 more source
Discussion about Some Problems of Environment On-line Monitoring System [PDF]
, 2009 相对于传统的环境监测方式,环境在线自动监控作为一种先进技术,在环境应急反应、提高办事效率及管理水平等方面具有突出优势,但在实际应用过程中面临着在企业的推广有难度、监管方式尚需完善以及监测方法不统一等方面的问题。本文针对这些问题从管理模式、运营机制、管理方式以及监测方法等四个方面提出了相应的解决方案,以求通过这些措施的应用,确保环境自动监测系统在未来的环境管理中发挥更加重要的作用。Compared with traditional methods of environmental monitoring ...
张黎黎, 牛晓琳, 颜海波
core
Gaoya dianqi, 2018 套管是电力变压器的重要附件,其安全稳定运行至关重要。为此,常采用在线监测技术对其运行状态进行实时监测。在电网内部,变压器套管在线监测系统已有一定应用。然而,监测数据不仅取决于套管自身绝缘性能,而且受温度、湿度和系统运行电压等环境因素影响,且当前各套管监测厂家推荐的预警策略各异,难以满足应用要求。因此研究适宜的在线监测预警策略至关重要;文中对广东电网在运变压器套管的介损值历史监测数据进行了统计分析。研究发现变压器套管在线监测应用过程中会出现短时性、间歇性的数据异常,异常率接近1%,导致监测系统告警 ...
夏健 +7 more
doaj
Integrative Conservation, Volume 4, Issue 3, Page 405-415, September 2025.Assessing the genetic diversity of edible insects harvested from the wild is a pre‐requisite for designing conservation and management policies. The caterpillars of Gynanisa maja (Saturniidae) are harvested in large numbers in mopane woodlands in southern Africa, where they represent a seasonal source of income and nutrition to many rural communities ...
Zwannda Nethavhani +3 more
wiley +1 more source