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Electric field and force characteristic of dust aerosol particles on the surface of high-voltage transmission line

Chinese Physics B 2024年第1期33卷 368-378页

作者：刘滢格李兴财王娟马鑫孙文海 School of Physics Ningxia UniversityYinchuan 750021China Xinhua College of Ningxia University Yinchuan 750021China School of Electronic-Electrical Engineering Ningxia UniversityYinchuan 750021China

High-voltage transmission lines play a crucial role in facilitating the utilization of renewable energy in regions prone to desertification. The accumulation of atmospheric particles on the surface of these lines can significantly impact corona discharge and wind-induced conductor displacement. Accurately quantifying the force exerted by particles adhering to conductor surfaces is essential for evaluating fouling conditions and making informed decisions. Therefore, this study investigates the changes in electric field intensity along branched conductors caused by various fouling layers and their resulting influence on the adhesion of dust particles. The findings indicate that as individual particle size increases, the field strength at the top of the particle gradually decreases and eventually stabilizes at approximately 49.22 k V/cm, which corresponds to a field strength approximately 1.96 times higher than that of an unpolluted transmission line. Furthermore,when particle spacing exceeds 15 times the particle size, the field strength around the transmission line gradually decreases and approaches the level observed on non-adhering surface. The electric field remains relatively stable. In a triangular arrangement of three particles, the maximum field strength at the tip of the fouling layer is approximately 1.44 times higher than that of double particles and 1.5 times higher compared to single particles. These results suggest that particles adhering to the transmission line have a greater affinity for adsorbing charged particles. Additionally, relevant numerical calculations demonstrate that in dry environments, the primary adhesion forces between particles and transmission lines follow an order of electrostatic force and van der Waals force. Specifically, at the minimum field strength, these forces are approximately74.73 times and 19.43 times stronger than the gravitational force acting on the particles.

关键词： high-voltage current electric field aerosol particles force characteristic

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一种基于图像处理的铁轨积沙检测方法

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宁夏工程技术 2024年第2期23卷 180-184,192页

作者：廖乾国李钧李兴财宁夏大学电子与电气工程学院宁夏银川750021 宁夏大学宁夏沙漠信息智能感知重点实验室宁夏银川750021 宁夏大学物理学院宁夏银川750021 塔里木大学信息工程学院新疆阿拉尔843300

针对积沙检测实时性差、易受天气因素影响、积沙量化指标不明确等问题,提出了一种基于图像处理的铁轨积沙检测方法,使用单尺度Retinex算法处理了沙尘天气条件下的铁轨积沙图像,通过铁轨未积沙区域特征提取和最大类间方差法对含有阴影的... 详细信息

针对积沙检测实时性差、易受天气因素影响、积沙量化指标不明确等问题,提出了一种基于图像处理的铁轨积沙检测方法,使用单尺度Retinex算法处理了沙尘天气条件下的铁轨积沙图像,通过铁轨未积沙区域特征提取和最大类间方差法对含有阴影的铁轨积沙图像进行了阈值分割,综合两次图像分割结果并获取了积沙信息。此外,基于铁路沙害等级划分指标对提取的积沙信息进行了沙害等级划分,最终实现了不同天气条件下的铁轨积沙检测。结果表明,该方法能够在晴天和沙尘天气下准确获得铁轨积沙状况并根据对应沙害等级提供预警。

关键词：铁轨积沙图像处理特征提取沙害等级

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Dual‑Atom Nanozyme Eye Drops Attenuate Inflammation and Break the Vicious Cycle in Dry Eye Disease

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Nano-Micro Letters 2024年第6期16卷 439-457页

作者： Dandan Chu Mengyang Zhao Shisong Rong Wonho Jhe Xiaolu Cai Yi Xiao Wei Zhang Xingchen Geng Zhanrong li xingcai Zhang Jingguo li Henan Eye Hospital Henan Provincial People’s HospitalPeople’s Hospital of Zhengzhou UniversityZhengzhou 450003People’s Republic of China Department of Ophthalmology Mass Eye and EarMass General BrighamHarvard Medical SchoolBostonMA 02114USA School of Engineering and Applied Sciences Harvard UniversityCambridgeMA 02138USA College of Chemistry Zhengzhou UniversityZhengzhou 450001People’s Republic of China

Dry eye disease(DED)is a major ocular pathology worldwide,causing serious ocular discomfort and even visual *** incidence of DED is gradually increasing with the highfrequency use of electronic *** inflammation is core cause of the DED vicious cycle,reactive oxygen species(ROS)play a pivotal role in the vicious cycle by regulating inflammation from ***,current therapies merely targeting inflammation show the failure of DED ***,a novel dual-atom nanozymes(DAN)-based eye drops are *** antioxidative DAN is successfully prepared by embedding Fe and Mn bimetallic single-atoms in N-doped carbon material and modifying it with a hydrophilic *** in vitro and in vivo results demonstrate the DAN is endowed with superior biological activity in scavenging excessive ROS,inhibiting NLRP3 inflammasome activation,decreasing proinflammatory cytokines expression,and suppressing cell ***,the DAN effectively alleviate ocular inflammation,promote corneal epithelial repair,recover goblet cell density and tear secretion,thus breaking the DED vicious *** findings open an avenue to make the DAN as an intervention form to DED and ROSmediated inflammatory diseases.

关键词： Dry eye disease DAN Dual-atom nanozyme Vicious cycle NLRP3 inflammasome Nanomedicine

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Electromagnetic scattering of charged particles in a strong wind-blown sand electric field

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Chinese Physics B 2019年第3期28卷 218-222页

作者： xingcai li Xuan Gao Juan Wang School of Physics and Electronic-Electrical Engineering Ningxia UniversityYinchuan 750021China Ningxia Key Laboratory of Intelligent Sensing for the Desert Information Ningxia UniversityYinchuan 750021China Xinhua College Ningxia UniversityYinchuan 750021China

Some field experimental results have shown that the moving sands or dust aerosols in nature are usually electrified,and those charged particles also produce a strong electric field in air, which is named as wind-blown sand electric *** scholars have pointed out that the net charge on the particle significantly enhances its electromagnetic(EM) extinction properties, but up to now, there is no conclusive research on the effect of the environmental electric field. Based on the extended Mie theory, the effect of the electric field in a sandstorm on the EM attenuation properties of the charged larger dust particle is studied. The numerical results indicate that the environmental electric field also has a great influence on the particle's optical properties, and the stronger the electric field, the bigger the effect. In addition, the charged angle, the charge density, and the particle radius all have a specific impact on the charged particle's optical properties.

关键词： wind-blown sand electric field extended Mie theory charged particle scattering

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Detecting sand-dust storms using a wind-profiling radar

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Journal of Arid Land 2017年第5期9卷 753-762页

作者： WANG Minzhong MING Hu HUO Wen XU Hongxiong li Jiangang li xingcai Institute of Desert Meteorology China Meteorological Administration Northwest Air Traffic Management Bureau Civil Aviation Administration of China State Key Laboratory of Severe Weather Chinese Academy of Meteorological Science School of Physics & Electrical Information Engineering Ningxia Key Laboratory of Intelligent Sensing for the Desert Information Ningxia University

Sand-dust storm is a type of disastrous weather, typically occurring in arid and semi-arid climates. This study selected a region in the hinterlands of the Taklimakan Desert, called the Tazhong region, as the experimental area to quantitatively estimate the particle concentrations of sand-dust storms using the boundary layer wind-profiling radar. We thoroughly studied the radar echo signals and reflectivity factor features during the sand-dust storms. The results indicate that（1） under sand-dust storm conditions, boundary layer wind-profiling radar cannot capture the complete information regarding horizontal wind velocity and direction, but it can obtain the backscattering intensity of sand-dust storms; and（2） during sand-dust storms particle size distributions in the surface layer closely resemble log-normal distributions, with sand-dust particles sizes of 90–100 μm accounting for the maximum particle probability. Retrieved particle size distributions at heights of 600, 800, and 1000 m follow log-normal distributions, and the expected value of particle diameter decreases gradually with increasing height. From the perspective of orders of magnitude, the retrieved results for particle number concentrations and mass concentrations are consistent with previous aircraft-detected results, indicating that it is basically feasible to use boundary layer wind-profiling radar to quantitatively detect the particle concentrations of dust storms.

关键词： echo signal mass concentration retrieval method sand-dust storm wind-profiling radar Taklimakan Desert

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Effect of photovoltaic panel electric field on the wind speed required for dust removal from the panels

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Chinese Physics B 2023年第8期32卷 296-303页

作者：李兴财王娟刘滢格马鑫 Ningxia Key Laboratory of Desert Information&Intelligent Sensing School of PhysicsElectronic and Electrical EngineeringNingxia UniversityYinchuan 750021China Key Laboratory of Mechanics on Disaster and Environment in Western China the Ministry of EducationLanzhou UniversityLanzhou 730000China Xinhua College of Ningxia University Yinchuan 750021China

Methods to remove dust deposits by high-speed airflow have significant potential applications,with optimal design of flow velocity being the core *** this paper,we discuss the wind speed required for particle removal from photovoltaic(PV)panels by compressed air by analyzing the force exerted on the dust deposited on inclined photovoltaic panels,which also included different electrification mechanisms of dust while it is in contact with the PV *** results show that the effect of the particle charging mechanism in the electric field generated by the PV panel is greatly smaller than the effect of the Van der Waals force and gravity,but the effect of the particle charged by the contact electrification mechanism in the electrostatic field is very *** wind speed required for dust removal from the PV panel increases linearly with the PV panel electric field,so we suggest that the nighttime,when the PV electric field is relatively small,would be more appropriate time for dust *** above results are of great scientific importance for accurately grasping the dust distribution law and for achieving scientific removal of dust on PV panels.

关键词： photovoltaic power generation dust removal electrostatic force required wind speed contact electrification

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基于BP神经网络光伏组件价格预测的研究

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上海节能 2023年第3期 355-361页

作者：李兴才上海能源科技发展有限公司

根据光伏组件的构成,将影响组件价格的因素分为技术因素和非技术因素,并采用网站数据采集法和专家咨询法确定各主要因素的分项价格,构建BP神经网络预测模型,在此基础上利用Matlab内置的Neural Net Fitting模块对组件价格进行预测,结果表... 详细信息

根据光伏组件的构成,将影响组件价格的因素分为技术因素和非技术因素,并采用网站数据采集法和专家咨询法确定各主要因素的分项价格,构建BP神经网络预测模型,在此基础上利用Matlab内置的Neural Net Fitting模块对组件价格进行预测,结果表明BP神经网络对组件价格预测的相关性较好,预测价格与实际价格偏差率为-2.62%~2.11%,预测结果可接受度为89.47%,预测精度满足实际需要,为光伏项目的顺利实施提供了辅助决策依据。

关键词：光伏组件价格预测 BP神经网络

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Experimental research on the convective heat transfer coefficient of photovoltaic panel

Experimental research on the convective heat transfer coeffi...

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中国力学大会-2021+1

作者： Weiwei Hu xingcai li Juan Wang Zihang Tian Bin Zhou Jinpeng Wu Runmin li Wencang li Ning Ma Jixuan Kang Yong Wang Jialong Tian Jibin Dai School of Physics and Electronic-Electrical Engineering Ningxia University Ningxia Key Laboratory of Intelligent Sensing& Desert Information Ningxia University Xinhua College of Ningxia University

The convective heat transfer between wind and photovoltaic(PV) panels will cause fluctuations in the temperature and performance of PV cells, which have a great negative impact on the grid-connected solar energy. The development of large-scale PV power plants in desertification areas has certain advantages, but the output power fluctuations caused by windy-dusty environment will be more common and important. This paper established a new model of convective heat transfer coefficient with and without dust deposition. Results show that the convective heat transfer coefficient of PV panel is not only affected by wind speed and dust density, but also related to the tilt angle of panel. As the dust accumulation density increases, the convective heat transfer coefficient of the dusty PV panel firstly increasing and then decreasing, and the maximum value appears when the dust deposition density is20 g/m. In addition, the average heat transfer coefficient of dusty PV module is slightly higher than that of clean PV panels by 4.13%, which can be revealed by the thermal diffusivity. This work confirms the influence of dust on the convective heat transfer characteristics, and provides an important basis for establishing a more practical PV panel temperature prediction model.? 2021 Elsevier Ltd. All rights reserved.

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220 kV输变电工程建设场地征用及清理费用结算方式研究

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上海节能 2022年第7期 916-921页

作者：李兴才上海能源科技发展有限公司

统计了国网24家省市电力公司220 kV输变电工程建设场地征用及清理费用结算方式,发现各公司对该费用结算方式存在不同标准。为此,对该费用特点进行了剖析,对费用细目进行了分类,提出了“A类费用”和“B类费用”的划分,并在此基础上进一... 详细信息

统计了国网24家省市电力公司220 kV输变电工程建设场地征用及清理费用结算方式,发现各公司对该费用结算方式存在不同标准。为此,对该费用特点进行了剖析,对费用细目进行了分类,提出了“A类费用”和“B类费用”的划分,并在此基础上进一步阐述了“按实结算”和“总价包干结算”两种方式,及根据其适用性应采取的实施主体和结算方式。

关键词：输变电工程建场费结算方式

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无砟轨道防沙挡板减沙效果的数值模拟研究

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中国沙漠 2023年第4期43卷 98-106页

作者：常凡胡伟伟李兴财宁夏大学物理与电子电气工程学院/宁夏沙漠信息智能感知重点实验室宁夏银川750021 兰州大学土木工程与力学学院/西部灾害与环境力学教育部重点实验室甘肃兰州730000

沙漠铁路常因风沙运动而轨道积沙,严重影响行车效率和运营安全。为了缓解铁路轨道内部沙粒的堆积,许多学者基于流场调控的方法设计相关的防轨道积沙设施。基于欧拉双流体模型研究了在无砟轨道中间布设与铁轨等高、具有不同几何截面的防... 详细信息

沙漠铁路常因风沙运动而轨道积沙,严重影响行车效率和运营安全。为了缓解铁路轨道内部沙粒的堆积,许多学者基于流场调控的方法设计相关的防轨道积沙设施。基于欧拉双流体模型研究了在无砟轨道中间布设与铁轨等高、具有不同几何截面的防沙挡板对轨道间流场及沙尘沉积过程的影响。结果表明:在无砟轨道内侧布设高175 mm、倾角分别为30°、45°、60°的倾斜挡板及矩形截面挡板、等腰直角三角形挡板可使得轨道间沙粒体积分数比降低7.98%、5.52%、4.56%、7.89%、6.83%,说明轨道间布设防沙挡板可以有效抑制轨道间的积沙,挡板倾角为30°时防沙效果最好。加入防沙挡板后,轨道间水平风速曲线呈“M”型变化,且防沙挡板两侧的流速明显增加,这种改变将显著增加颗粒的运动距离,从而降低轨道间积沙。

关键词：轨道积沙风沙两相流防沙挡板流场抬升

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