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Metal-free Optical Pressure Sensor with High Sensitivity and Extensive Range

CSEE Journal of Power and Energy Systems 2024年第3期10卷 1291-1300页

作者： Mao Ji Meng Huang Haomin Lyu Sheng Shi bo qi Chengrong Li State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China IEEE CSEE

Pressure monitoring of a transformer oil tank can grasp the pressure change process caused by gas production when severe internal defects occur and take timely measures to ensure the safe operation of the *** pressure sensors generally use metal encapsulation or have an air cavity structure,threatening the transformer’s insulation if it is directly used inside the *** this end,this paper proposes a method for developing a high-sensitivity,large-range,and metallizationfree optical pressure sensing device with temperature *** grating is encapsulated by fluorosilicone rubber and supplemented by an epoxy resin shielding shell on the *** the same time,a double-grating vertical arrangement is adopted to improve pressure measurement sensitivity,further avoiding the influence of temperature rise caused by a defect of the transformer on the measurement result of the *** addition,by optimizing the geometric structure of the internal sensitizing element,pre-stretching length of the fiber grating,gap distance,and other parameters,probe size can be reduced while ensuring the sensor’s *** show the proposed method can meet the requirements of sensor fabrication with different sensitivities and ranges,and to a certain extent,both high sensitivity and extensive ranges can be taken into *** sensitivity of the fabricated prototype is 15 pm/kPa,and the range is about 0.2 *** the same time,the metal-free feature of the sensor makes it suitable for use in various oil-immersed power *** records oil pressure changes caused by oil discharge breakdown,making it sensitive to small pressure changes in early failures.

关键词： Highly sensitive extensive range optical sensing no metallization pressure perception temperature compensation transformer

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Optical Sensor with Wide Range and High Sensitivity for Internal Magnetic Field Detection of Transformer

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CSEE Journal of Power and Energy Systems 2024年第5期10卷 2230-2244页

作者： Meng Huang Wei Zheng Tong Ji Mao Ji Tianjiao Pu bo qi State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China Beijing Key Laboratory of High Voltage&EMC North China Electric Power UniversityBeijing 102206China China Electric Power Research Institute Beijing 100192China

The deterioration of winding defects is one of the important causes of power transformer fires and even explosion *** change of leakage magnetic field distribution is the most direct response to winding *** there are few sensors suitable for online measurement of the internal magnetic field of *** on the Faraday magneto-optical effect,a magnetic field sensor with wide range and high sensitivity is proposed in this paper,which is suitable for the interior use of *** straight-through optical structure with interior polarizer is adopted,and the sensor has a measurement range of 1.5 T and a sensitivity of 1 *** also possesses a small size,with a length of about 30 mm after *** influence mechanism of vibration and temperature is revealed through theoretical analysis and numerical *** is proposed to filter out the interference of vibration by characteristic frequency analysis and to compensate for temperature by a two-probe *** anti-interference test verifies the effectiveness of this method,and it can reduce the error from 80.56%to 2.63%under the combined interference of vibration and temperature.

关键词： Anti-interference Bessel function Faraday magneto-optical effect leakage magnetic field transformer two-probe structure

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Regulating electrochemical performances of lithium battery by external physical field

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Rare Metals 2024年第6期43卷 2391-2417页

作者： Shi-Kang Wang Shuai Wu Yi-Cheng Song Hassanien Gomaa Cui-Hua An qi-bo Deng Ning Hu School of Mechanical Engineering School of Materials Science and EngineeringHebei University of TechnologyTianjin 300401China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai 200444China Department of Chemistry Faculty of ScienceAl-Azhar UniversityAssiut 71524Egypt Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles Tianjin 300401China State Key Laboratory of Reliability and Intelligence Electrical Equipment Key Laboratory of Advanced Intelligent Protective Equipment TechnologyMinistry of EducationHebei University of TechnologyTianjin 300130China

Lithium batteries have always played a key role in the field of new energy ***,non-controllable lithium dendrites and volume dilatation of metallic lithium in batteries with lithium metal as anodes have limited their ***,a large number of studies have shown that the electrochemical performances of lithium batteries can be enhanced through the regulation of external physical ***,it significantly hinders the growth of lithium dendrites and promoting the reaction *** review summarizes recent innovations in the investigation of various physical fields of lithium *** application of magnetic field in the synthesis of lithium battery electrode materials is *** influence factors and regulation mechanism of various physical fields on the electrochemical performance of lithium batteries are reviewed *** addition,the current research status and existing challenges,along with future directions for the evolution of lithium batteries,are minutely discussed and *** strategies for the further evolution of lithium batteries have also been provided.

关键词： Lithium battery External field assist Reaction kinetics Lithium dendrite

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A nano-sheet graphene-based enhanced thermal radiation composite for passive heat dissipation from vehicle batteries

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Nano Materials Science 2024年第4期6卷 443-455页

作者： Ji-Xiang Wang Christopher Salmean Jiaxin Li Chaojie Lei Jun Li Mingliang Zhong bo qi Yufeng Mao Hebei Key Laboratory of Man-machine Environmental Thermal Control Technology and Equipment Hebei Vocational University of Technology and Engineering College of Electrical Energy and Power EngineeringYangzhou University Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Taizhou Wavexploration Energy Ltd. Department of Electrical and Computer Engineering University of Toronto China Academy of Launch Vehicle Technology Beijing Sino-Spark Technology Co. Ltd. School of Environmental Science and Engineering Suzhou University of Science and Technology Institute of Optics and Electronics Chinese Academy of Sciences National Key Laboratory of Optical Field Manipulation Science and Technology Chinese Academy of Sciences

In response to thermal runaway(TR) of electric vehicles, recent attention has been focused on mitigation strategies such as efficient heat dredging in battery thermal management. Thermal management with particular focus on battery cooling has been becoming increasingly significant. TR usually happened when an electric vehicle is unpowered and charged. In this state, traditional active battery cooling schemes are disabled, which can easily lead to dangerous incidents due to loss of cooling ability, and advanced passive cooling strategies are therefore gaining importance. Herein, we developed an enhanced thermal radiation material, consisting of ～1 μm thick multilayered nano-sheet graphene film coated upon the heat dissipation surface, thereby enhancing thermal radiation in the nanoscale. The surface was characterized on the nanoscale, and tested in a battery-cooling *** found that the graphene-based coating's spectral emissivity is between 91 % and 95 % in the mid-infrared region, and thermal experiments consequently illustrated that graphene-based radiative cooling yielded up to15.1 % temperature reduction when compared to the uncoated analogue. Using the novel graphene surface to augment a heat pipe, the temperature reduction can be further enlarged to 25.6 %. The new material may contribute to transportation safety, global warming mitigation and carbon neutralization.

关键词： Battery thermal management Nano-sheet graphene Functional material Passive cooling Thermal radiation

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Non-linear relationship between age and subfoveal choroidal thickness in Chinese patients with proliferative diabetic retinopathy

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World Journal of Diabetes 2024年第9期15卷 1903-1915页

作者： Chun-Yan Lei Jiang-Ying Xie qi-bo Ran Mei-Xia Zhang Department of Ophthalmology and Research Laboratory of Macular Disease West China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina Sichuan University Operating Room Department of AnesthesiologyWest China HospitalSichuan University/West China School of NursingSichuan UniversityChengdu 610041Sichuan ProvinceChina

BACKGROUND No study has investigated the change regularity between age and subfoveal choroidal thickness(SFCT)in proliferative diabetic retinopathy(PDR).AIM To investigate the relationship between the SFCT and age in Chinese patients with *** This was a cross-sectional retrospective *** participants were hospitalized individuals with type 2 diabetes who underwent vitrectomy for *** eyes that met the criteria were included in the *** necessary laboratory tests were performed at the time of *** macular thickness(CMT)and SFCT were two quantitative assessments made using enhanced depth imaging optical coherence *** was measured automatically and SFCT was measured manually with digital calipers provided by the Heidelberg Eye Explorer *** The final analysis included a total of 234 individuals with *** average age was 55.60 years old±10.03 years old,and 57.69%of the population was *** analysis revealed a significant negative connection between age and SFCT in patients with PDR[β=-2.44,95%confidence interval(95%CI):-3.46 to-1.42;P<0.0001].In the fully adjusted model,the correlation between SFCT and age remained steady(β=-1.68,95%CI:-2.97 to-0.39;P=0.0117).Spline smoothing showed that the relationship between SFCT and age in patients with PDR was non-linear,with an inflection point at 54 years of *** Our findings suggest that age is a key determinant of choroidal *** non-linear link between SFCT and age in PDR patients should be taken into account.

关键词： Age Subfoveal choroidal thickness Proliferative diabetic retinopathy Optical coherence tomography Central macular thickness

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Wobbling motion for a triaxial rotor plus a single quasiparticle

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Chinese Physics C 2024年第3期48卷 104-117页

作者：李嗣华戴华名陈启博周先荣 Department of Physics East China Normal UniversityShanghai 200241China

Wobbling motion in a system comprising a triaxial rotor and a single quasiparticle is studied employing the particle-rotor *** energy spectra,wobbling frequencies,electromagnetic transition probabilities,g-factors,angular momentum components,spin coherent state maps,and static quadrupole moments are *** investigations were conducted with regard to the Fermi surface transitioning from the lowest h_(11/2) orbit to the highest *** the Fermi surface increases,notable transformations occur in the wobbling ***,the mode exhibits a transverse revolution around the short axis of the ***,as the Fermi surface continues to increase,the mode gradually shifts to a longitudinal revolution around the intermediate ***,it transitions to a transverse revolution around the long ***,the stability of the long axis transverse mode diminishes relative to its counterpart along the short axis as the total angular momentum increases atγ=20∘.

关键词： Wobbling motion Fermi surface particle-rotor model angular momentum geometry

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环保垂直管理改革的组织逻辑与治理效应

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广东财经大学学报 2024年第2期39卷 114-128页

作者：陈启博清华大学公共管理学院北京100084

环保垂改作为中国环境管理体制改革的重要举措,开启了中国环境管理体制由属地管理转向省内垂直管理。基于控制权理论构建环保垂改的理论分析框架,运用2013—2021年地级市面板数据和多期双重差分模型检验了环保垂改的治理效应及其影响机... 详细信息

环保垂改作为中国环境管理体制改革的重要举措,开启了中国环境管理体制由属地管理转向省内垂直管理。基于控制权理论构建环保垂改的理论分析框架,运用2013—2021年地级市面板数据和多期双重差分模型检验了环保垂改的治理效应及其影响机制。研究表明:环保垂改使市级和县级环保部门的控制权在组织层面发生了转移,为环保部门内部的上下级垂直管理赋予了实质性权威,从而提高了基层环境执法力度,降低了地区污染物排放;动态效应分析表明,环保垂改产生的污染减排作用具有较好的持续性;进一步分析表明,环保垂改对财政压力和官员关联促进污染物排放具有显著的负向调节作用,并对边界污染的治理效应更为显著。研究结论为地方政府与环保部门间以及上下级环保部门间如何有效分工与协作、保障环境治理长治久安提供了理论和经验证据。

关键词：环境管理体制垂直管理治理效应控制权分配实质性权威形式性权威环境治理

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胸段食管鳞状细胞癌患者术后淋巴转移危险因素分析

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新乡医学院学报 2024年第7期41卷 680-683页

作者：山明刚齐博新乡医学院第一附属医院胸外科河南卫辉453100

目的探讨胸段食管鳞状细胞癌患者淋巴结转移的危险因素。方法选择2020年1月至2022年6月于新乡医学院第一附属医院胸外科行手术治疗的105例胸段食管鳞状细胞癌患者为研究对象,根据术后是否发生淋巴结转移分为淋巴结转移组(n=34)和非淋巴... 详细信息

目的探讨胸段食管鳞状细胞癌患者淋巴结转移的危险因素。方法选择2020年1月至2022年6月于新乡医学院第一附属医院胸外科行手术治疗的105例胸段食管鳞状细胞癌患者为研究对象,根据术后是否发生淋巴结转移分为淋巴结转移组(n=34)和非淋巴结转移组(n=71)。收集患者的临床资料,采用单因素和多因素logistic回归分析影响胸段食管鳞状细胞癌患者淋巴结转移的危险因素。结果单因素分析结果显示,胸段食管鳞状细胞癌患者的病理分化程度、肿瘤最大长径、脉管癌栓与淋巴结转移有关(P0.05)。多因素logistic回归分析结果显示,肿瘤最大长径长、分化程度低、有脉管癌栓为胸段食管鳞状细胞癌淋巴结转移的独立危险因素(P<0.05)。结论肿瘤最大长径大、分化程度低、存在脉管癌栓是食管鳞状细胞癌患者出现淋巴结转移的危险因素。

关键词：食管鳞状细胞癌淋巴结转移危险因素

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“小米模式”的新型超滤膜水厂设计理念及应用

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中国给水排水 2024年第16期40卷 60-64页

作者：张东波闫静郝齐波北京市市政工程设计研究总院有限公司北京100082 上海超清源工程设计有限公司上海200000 洛阳城市建设勘察设计院有限公司河南洛阳471000

近10年来以超滤膜为核心的净水处理工艺在自来水厂建设中得到了广泛应用,然而其建设和运营成本较高的问题限制了该技术的进一步推广。借鉴小米产品极致性价比的模式,采用“短平流+超滤膜”的短流程净水工艺降低水厂整体建设成本、利用... 详细信息

近10年来以超滤膜为核心的净水处理工艺在自来水厂建设中得到了广泛应用,然而其建设和运营成本较高的问题限制了该技术的进一步推广。借鉴小米产品极致性价比的模式,采用“短平流+超滤膜”的短流程净水工艺降低水厂整体建设成本、利用零污染通量来解决长期运行的膜污染问题以及构建有效的智慧水厂决策模型来降低水厂运营成本设计理念,打造成本较低的绿色低碳水厂,并以具体工程案例进行验证。

关键词：小米模式绿色低碳短流程净水工艺零污染通量智慧水厂

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计及界面电荷和极性效应的油纸复合绝缘非线性电路等效模型

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电工技术学报 2024年第11期39卷 3422-3432页

作者：黄猛李怡然吴延宇陈良炯齐波新能源电力系统全国重点实验室(华北电力大学) 北京102206

换流变压器是特高压直流输电工程中的关键设备,换流变压器油纸复合绝缘的界面处在直流电压下易积聚电荷,诱发局部放电甚至击穿。当前对于界面电荷的积聚分布,多采用传统的阻容模型进行计算,存在较大的误差。该文提出一种简易的非线性电... 详细信息

换流变压器是特高压直流输电工程中的关键设备,换流变压器油纸复合绝缘的界面处在直流电压下易积聚电荷,诱发局部放电甚至击穿。当前对于界面电荷的积聚分布,多采用传统的阻容模型进行计算,存在较大的误差。该文提出一种简易的非线性电路等效模型,首先,分别测量变压器油和油浸纸板的电容、电阻参数与极化电流,获得油纸的拓展Debye模型;其次,在拓展Debye模型的基础上,将变压器油和油浸纸板的恒定电阻模型改为随电场变化的非线性模型,并加入反映极性效应的界面势垒限制电流源,以此建立等效模型;最后,将电路等效模型仿真结果与实际测量结果进行对比。结果表明,与实际测量结果相比,该等效模型具有良好的适用性。该文模型为油纸绝缘的电场分布、界面电荷积聚量的计算提供了一种准确度较高的简便方法。

关键词：油纸绝缘界面电荷界面极化拓展Debye模型电路等效模型

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