Results 31 to 40 of about 7,613 (169)
500/±800kV交直流同塔混压输电线路对并行油气管道的电磁影响分析
Dianci bileiqi, 2021 为研究交直流混压输电线路对平行敷设油气管道的电磁影响,以500/±800 kV交直流混压同塔架空线路与输油输气管道并列运行为背景,利用电磁暂态仿真软件ATP建立输电线路与油气管道等效时域模型,计算了无限长、有限长管道感应电压,有限长管道的交流电流密度,并分析了交流线路、直流线路对管道感应电压的影响程度。结果表明:感应电压主要由交流输电线路引起;无限长管道与输电线路并列运行部分的感应电压未超过职业人员人体安全电压限值;当平行油气管道两端绝缘悬空时,其感应电压最高可达452.88 V ...
谷泓杰 +4 more
doaj
Design Of A 10W Class D Audio Power Ampilifer [PDF]
, 2013 功率放大器有A类，B类，AB类和C类等线性功率放大器和D类等非线性功率放大器。线性功率放大器失真小，但其效率低，发热大，不能满足日益小型化的音频设备。D类功率放大器是基于脉冲宽度调制技术(PWM)的开关放大器，它效率高、功耗低、发热小，可以延长电池的使用时间；它较低的失真可以保证输出的音质；另外它还有体积小、重量轻等优点，使之被广泛应用于便携式设备中，有广阔的发展前景。 本文首先分析了各种类型的音频功率放大器的原理及各自的性能特点，然后重点阐述了D类功率放大器的工作原理，在此基础上设计了一款全差分输入 ...
张玄
core
2-D honeycomb MI wave communication system [PDF]
, 2014 To realize the high reliable communication and the wireless power transmission in the wireless underground sensor network,a new type of 2D honeycomb magneto-inductivenetwork was put forward at VLF band.The system model was established,and bandwidth,group
Feng LIU +3 more
core +1 more source
A Mini Review of Scientific Designs of Dynamic Responsive Fluids in Battery Technologies
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Dynamic responsive fluids are emerging as transformative elements in the evolution of battery technologies, marking a pivotal shift from static passive designs toward systems that actively sense and adapt to their operating environments. By integrating dynamic responsive fluids, batteries can interact with both internal and external stimuli in
Xiu‐Zhen Yang +11 more
wiley +1 more source
Gaoya dianqi, 2013 同塔双回输电线路架空地线逐基接地时,架空地线的感应电流和电能损耗是值得关注的问题,目前关于架空地线损耗的定量研究较少。通过对广东某220 kV同塔双回输电线路架空地线感应电流进行了现场实测,使用ATP-EMTP程序对该线路感应电流进行仿真计算,实测值与计算值吻合较好。计算讨论了同塔双回架空线路导线相序排列方式、线路电流大小和线路电流不平衡度对架空地线感应电流和电能损耗的影响。结果表明,架空地线感应电流和线路电流变化呈线性关系,地线电能损耗与线路电流增大呈平方关系 ...
王宇 +5 more
doaj
Overview of ionospheric currents inversion by using low Earth orbit satellite magnetic observations [PDF]
With the development of satellite technology, low-orbit satellites equipped with high-resolution magnetometers have become an important tool for measuring the Earth's magnetic field, which provides continuous observations around the world regardless of ...
bohao Qian +8 more
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Summary of Grounding Fault Finding Strategies in Substation DC System [PDF]
, 2023 [Introduction] With the rapid development of power electronic equipment and artificial intelligence and other high-tech, DC (Direct Current) system has been popularized and applied in substations.
Jiantao ZHANG +4 more
core +1 more source
Veterinary Dermatology, Volume 36, Issue 6, Page 723-787, December 2025.Hyperkeratosis of (a) the footpads and (b) the nasal planum. ABSTRACT Background Canine leishmaniosis (CanL) due to Leishmania infantum remains common, and veterinarians do not always follow scientifically sound approaches for diagnosis, treatment and prevention. Objectives To provide consensus guidelines for diagnosis and evidence‐based guidelines for
Manolis N. Saridomichelakis +9 more
wiley +1 more source
Research of Multi-domain Eddy Current Testing Simulation [PDF]
, 2012 飞行器维修中使用无损检测可以及早发现缺陷，保证飞行器的质量并维持其持续适航。其中涡流检测在导体表面和近表面缺陷检测中具有的灵敏度高，使用方便和非接触、单面检测的优势，因而成为飞行器无损检测的重要手段之一。 涡流检测中，需要对探头的激励频率、提离等参数进行优化。进行涡流计算仿真，可以低成本的研究这类问题。有限元法在涡流计算中得到了广泛的应用。但是随着仿真模型的复杂化以及模型中含有物体运动时，传统的仅用一个求解区域的有限元法在对该类问题的处理上遇到了瓶颈 ...
何荣光
core
Effect of local induction heating on secondary roll-forming of high strength square tubes [PDF]
, 2016 The formability of corners was improved by heating the corner area of high strength square tubes with induction coils.Under the premise of not impacting the undeformed zone,we obtained the ideal sectional dimension,microstructure and properties of ...
CHEN Qiang +5 more
core +1 more source