Results 41 to 50 of about 15,905 (167)
Development of an Aerodynamic Lens-Proton Transfer Reaction Mass Spectrometry (PTR-MS) Apparatus for Online Detection of Organic Compounds in Aerosol Particles [PDF]
Atmospheric organic aerosols consist of both gas-phase organic compounds and particle-phase organic compounds. The components of aerosol particles (solid or liquid droplets) can undergo exchange or chemical reactions with gas-phase components ...
Chao-qun HUANG +11 more
core +1 more source
Is parvovirus B19 infection upsurge in 2023–2024 associated with adverse pregnancy outcome?
Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 3, Page 307-313, September 2025.ABSTRACT Objective A surge in parvovirus B19 infections has been reported in 2023–2024 across Europe and the USA, raising concerns about the associated perinatal risks. The aim of this study was to compare perinatal outcomes following maternal parvovirus B19 infection during the 2023–2024 period with those from a pre‐2023 cohort.
S. Prasad +22 more
wiley +1 more source
Dianci bileiqi, 2013 输电线路在线监测是实现输电线路状态检测和检修的重要手段。为评价输电线路在线监测可靠性,采用层次分析法建立了以环境因素、监测装置本体、人员因素、管理因素的可靠性评价体系结构,在可靠性评价体系基础上建立了输电线路可靠性多级模糊综合评价模型,对武汉地区一条线路的在线监测的可靠性进行了评估,确定了该条线路的在线监测可靠性等级为差,可靠性差主要是由于装置本体原因引起的。
王国胜, 梁瑞玲, 舒应军
doaj
Research on Stress and Workpiece Material On-line detection Technology of Precision Machining Platform [PDF]
, 2010 精密加工是一个多种因素综合作用的过程，精密加工平台将不可避免地存在发热、变形、机械运动不稳定等问题。为了确保加工精度、降低次废品率及提高加工效率，应开发高精度的在线检测系统，对加工过程中易影响工件加工精度的动、静部件的应变进行实时检测并通过一定的方法进行反馈。从而形成加工和检测一体化，确保生产加工高效合格地进行。同时需要实时检测工件的材料，掌握加工件的材料状况，如工件材料种类、是否有缺陷、材料是否变化等。 本课题设计了一款适用于精密加工平台的八通道检测系统 ...
李春梅
core
External validation of QUiPP App in three independent European cohorts of symptomatic women
Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 2, Page 163-174, August 2025.ABSTRACT Objective To validate externally the QUantitative Innovation in Predicting Preterm birth (QUiPP) App v.2 for the prediction of spontaneous preterm birth (sPTB) in symptomatic women attending tertiary care in Europe. Methods The QUiPP App v.2 was validated in three independent datasets: a prospective European multicenter cohort across five ...
A. M. Fischer +8 more
wiley +1 more source
Gaoya dianqi, 2018 换流变压器在线监测系统是特高压换流变电站智能化的重要建设内容,其监测可靠性直接影响着换流变压器的运行寿命,目前主要通过同样检测原理的带电检测手段对其进行评估。文中通过对某±800 kV特高压换流变电站换流变压器油色谱在线监测乙炔报警与局部放电重症监护系统报警后的带电检测诊断分析,给出了在线监测系统信号报警后的缺陷分析方法以及换流变压器在线监测报警信号存在的问题,便于后续运行过程中对其进行状态评价。试验结果证明:单独的一种在线监测报警信号不能完成特高压换流变压器的运行状态评价 ...
牛勃 +7 more
doaj
Gaoya dianqi, 2022 电力设备局部放电射频检测技术具有灵敏度高、抗干扰能力强的优势。该方法在电力设备带电检测中得到了广泛重视和推广应用。然而，电力设备的金属外壳限制了射频信号向外传播，极大降低了外置式射频检测技术的灵敏度。为此，提出一种地线外置式局部放电射频检测方法。首先，阐述了地线引出电力设备金属外壳的结构，阐述了局部放电射频信号在地线上耦合、传导、辐射的原理；其次，利用时域有限差分法仿真了射频电磁波经过地线向外传播的动态过程，分析了设备外侧射频信号的时频特性；最后，应用了地线外置式射频信号检测方法 ...
叶兆平 +6 more
doaj
System Error Separation and Revision for Aspheric Lens On-Machine Measurement [PDF]
, 2010 为了解决非球面在线检测的系统误差问题,针对系统误差产生的机理、误差的数学模型、分离方法以及补偿方法进行了研究.提出一种将空间误差投影到不同平面上进行分析从而解决测量系统误差的新方法并建立了各系统误差的数学模型.根据最小二乘法的基本思想,建立了基于标准球面的系统误差分离数学模型,得到了各参数的最小二乘估计值,并利用误差修正模型进行了校正.利用标准球面进行测量实验,验证了该方法的有效性和精确性.实验结果表明所提出的解决测量系统误差的思路可行,最终可使测量系统精度达到1μM数量级 ...
朱永炉, 柯晓龙, 郭江, 郭隐彪
core
Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 2, Page 200-209, August 2025.Abstract Objectives Neonates with critical congenital heart disease (CCHD) are at risk for adverse early brain development and long‐term neurodevelopmental sequelae. Insulin‐like growth factor‐1 (IGF‐1) and insulin‐like growth factor binding protein‐3 (IGFBP‐3) are essential contributors to brain growth and maturation.
M. Nijman +33 more
wiley +1 more source
Detection of canine external ear canal lesions using artificial intelligence
Veterinary Dermatology, Volume 36, Issue 4, Page 424-432, August 2025.Background – Early and accurate diagnosis of otitis externa is crucial for correct management yet often can be challenging. Artificial intelligence (AI) is a valuable diagnostic tool in human medicine. Currently, no such tool is available in veterinary dermatology/otology.
Neoklis Apostolopoulos +3 more
wiley +1 more source