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Protective effect of compressing arc extinguishing lightning protection device on superimposed lightning strikes

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High Technology Letters 2021年第4期27卷 440-447页

作者： Bi Jieting wang jufeng Yan Shen School of Electrical Engineering Guangxi UniversityNanning 530004P.R.China Jiangsu Vocational College of Electronics and Information Huaian 223003P.R.China

Traditional lightning protection measures can not solve the problem of superimposed lightning *** paper presents a compressing arc extinguishing lightning protection device,which can solve the problem of superimposed lightning *** device can extinguish the power frequency continuous current arc quickly in 1-2 *** is far less than the response time of relay protection,which can avoid lightning trips and improve the reliability of power *** computer simulation and engineering practice show that the compressing arc extinguishing device has good protection effect on superimposed lightning strikes.

关键词： compressing arc extinguishing superimposed lightning strike simulation lightning trip power frequency continuous

A Dimension-Splitting Variational Multiscale Element-Free Galerkin Method for Three-Dimensional Singularly Perturbed Convection-Diffusion Problems

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Computer Modeling in Engineering & Sciences 2023年第4期135卷 341-356页

作者： jufeng wang Yong Wu Ying Xu Fengxin Sun College of Finance&Information Ningbo University of Finance&EconomicsNingbo315175China Faculty of Science Ningbo University of TechnologyNingbo315016China

By introducing the dimensional splitting(DS)method into the multiscale interpolating element-free Galerkin(VMIEFG)method,a dimension-splitting multiscale interpolating element-free Galerkin(DS-VMIEFG)method is proposed for three-dimensional(3D)singular perturbed convection-diffusion(SPCD)*** the DSVMIEFG method,the 3D problem is decomposed into a series of 2D problems by the DS method,and the discrete equations on the 2D splitting surface are obtained by the VMIEFG *** improved interpolation-type moving least squares(IIMLS)method is used to construct shape functions in the weak form and to combine 2D discrete equations into a global system of discrete equations for the three-dimensional SPCD *** solved numerical example verifies the effectiveness of the method in this paper for the 3D SPCD *** numerical solution will gradually converge to the analytical solution with the increase in the number of *** extremely small singular diffusion coefficients,the numerical solution will avoid numerical oscillation and has high computational stability.

关键词： Dimension-splitting multiscale interpolating element-free Galerkin(DS-VMIEFG)method interpolating variational multiscale element-free Galerkin(VMIEFG)method dimension splitting method singularly perturbed convection-diffusion problems

Influence of chamber structure on arc quenching in multigap system

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High Voltage 2020年第3期5卷 313-318页

作者： Zijian Li jufeng wang Xin Zhou Shangshi Huang Renbao Yan Zhijian Xia School of Electrical Engineering Guangxi UniversityNanningPeople's Republic of China Meishan Power Supply Branch of State Grid Sichuan Electric Power Co. LtdSichuanPeople's Republic of China Fuzhou Power Supply Branch of State Grid Jiangxi Electric Power Co. LtdJiangxiPeople's Republic of China

In order to improve the arc quenching ability of the multigap system,it is important to know the principle of arc quenching and how the chamber structure affects the arc development process in the multigap *** this study,the twodimensional geometric model of the multigap system is established based on the magnetohydrodynamics theory in COMSOL multiphysics simulation *** principle of arc quenching in the multigap system is explained in detail by analysing the physical characteristics of the arc in the multigap *** simulation result shows that the arc is compressed at large scales in the semi-closed chambers of the multigap system,which results in an instantaneous temperature rise of the arc,thus,forming the self-expanding *** strong self-expanding airflow cuts off the arc channel and blocks the energy supply of the *** influence of the chamber structure on arc quenching in the multigap system is manifested in the fact that proper improvement of the width and depth of the chamber subserves arc cooling,the reduction of the deflection angle and the increment of the number of the chambers are conductive to arc extinction.

关键词： quenching system structure

Microstructural Characteristics of the 2nd Member Shale of Kongdian Formation in Cangdong Sag,Baohai Bay Basin,China

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Acta Geologica Sinica(English Edition) 2015年第A1期89卷 218-221页

作者： XU Zuxin ZHANG Yijie wang jufeng JIANG Wenya Research Institution of Petroleum Exploration andDevelopment PetroChina Beijing 100083 Exploration and Development Research Institute of Dagang Oilfield PetroChina Tianjin 300280

1 Introduction In recent years, shale gas has attracted wide attention. Research on pore structure is one of the important content for the evaluation of shale gas reservoirs, many scholars are aware of the importance of pore structure in the storage and flow of shale gas. he pore types, pore size and the distribution of pores have impact on the aggregation of shale gas.

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Analysis on the choice of accounting methods in business combination

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International English Education Research 2016年第7期 99-101页

作者： wang jufeng Shanghai University of Engineering Science No.333 Longteng Road shanghai China

Business combination is the required road for company who want to be bigger and stronger, especially in today＇s era of rapid economic development, mergers between enterprises has been a hot activity in capital markets. In our business combination there are two accounting methods, namely the equity method under the same control and the purchase method under the same control. This article on the basis of merger accounting methods, analysis the difference of the two methods, and describes the current problems existing in the practice, and puts forward corresponding countermeasures.

关键词： Business combination equity method the purchase method accounting methods

Stability analysis for a class of nonlinear networked control systems

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Stability analysis for a class of nonlinear networked contro...

强气流下灭弧防雷间隙的气流场仿真及灭弧试验研究

第37届中国控制会议

作者： jufeng wang Chunfeng Liu Department of Information and Computing Science China Jiliang University School of Management Hangzhou Dianzi University

This paper studies the exponential stability problem for nonlinear networked control systems（NCSs） with time delay and packet *** closed-loop NCS is modeled as a new discrete-time switched *** on approximate discretetime models with a constant time delay,the controller is *** conditions for the exponential stability of the closed-loop nonlinear networked control systems with a certain packet-dropout rate are provided.

关键词： Networked control system Time delay Packet dropout Stability Nonlinear system

来源： cnki会议评论

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高电压技术 2017年第5期43卷 1635-1641页

作者：黄萍王巨丰广西大学电气工程学院南宁530004

为了探讨强气流下灭弧防雷间隙灭弧效果的影响因素,基于极快速电弧截断防雷新理论,对强气流下灭弧防雷间隙抑制电弧发展的机理进行了研究。采用链式电弧模型分析电弧元的运动情况,并求解电弧元速度方程。利用ANSYS AUTODYN模拟不同入口... 详细信息

为了探讨强气流下灭弧防雷间隙灭弧效果的影响因素,基于极快速电弧截断防雷新理论,对强气流下灭弧防雷间隙抑制电弧发展的机理进行了研究。采用链式电弧模型分析电弧元的运动情况,并求解电弧元速度方程。利用ANSYS AUTODYN模拟不同入口气压下气流场形态,得到气流速度数值仿真结果,并进行了灭弧试验验证。对每次试验的灭弧时间进行数据统计,进一步研究了灭弧防雷间隙的灭弧效果。结果表明:灭弧筒入口气压为20MPa时,气流速度可达573.9 m/s,且入口气压越高则气流速度越大,电流过零后气体介质强度恢复就越快,从而越利于熄灭电弧;灭弧时间实际数值与计算值趋于一致,电弧在4.6 ms内经拉长直至熄灭,且灭弧时间与故障电弧电流值负相关,与气流速度正相关,气流速度越大则灭弧时间越短。研究结果证明了气流速度对灭弧的重要性。

关键词：强气流灭弧防雷间隙电弧元伏秒特性绝缘子灭弧时间

渤海湾盆地大港探区加里东期不整合面特征再认识

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石油与天然气地质 2021年第2期42卷 430-442页

作者：韩品龙肖敦清王居峰中国石油勘探开发研究院石油天然气地质所北京100083 中国石油大港油田公司天津大港300280

应用“地层尺度”方法,通过在区域地层框架下的岩性组合和电测曲线特征,将大港探区奥陶系峰峰组划分为若干小层,并在全区开展小层对比,研究不同小层经加里东运动改造后在奥陶系顶部不整合面的出露情况,以期还原加里东运动后的古地貌形... 详细信息

应用“地层尺度”方法,通过在区域地层框架下的岩性组合和电测曲线特征,将大港探区奥陶系峰峰组划分为若干小层,并在全区开展小层对比,研究不同小层经加里东运动改造后在奥陶系顶部不整合面的出露情况,以期还原加里东运动后的古地貌形态。研究结果表明,大港探区加里东期不整合面是小层(十~几十米)级别的低角度不整合,加里东运动改造后地势总体呈北高南低、东高西低的地貌形态,峰峰组小层出露具有由低向高逐渐变老的特点;该低角度不整合的存在改变了以往的认识,还原了加里东运动对奥陶系地层的影响,同时在峰峰组小层框架下,揭示了受第5小层控制,上、下碳酸盐储层在纵向上具有不同的发育规律,其上发育岩溶喀斯特及团块状白云岩储层,其下发育层状白云岩储层,在黄骅坳陷中南部地区连续分布,具备较好的储集性能。上覆煤系地层沉积覆盖后与下伏奥陶系储层形成多类型的源-储配置关系,具有捕获后期生成油气的条件。

关键词：白云岩储层地层尺度法不整合面峰峰组奥陶系加里东期大港探区渤海湾盆地

Irinotecan hydrochloride liposome HR070803 in combination with 5-fluorouracil and leucovorin in locally advanced or metastatic pancreatic ductal adenocarcinoma following prior gemcitabine-based therapy (PAN-HEROIC-1): a phase 3 trial

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Signal Transduction and Targeted Therapy 2024年第10期9卷 4628-4636页

作者： Jiujie Cui Shukui Qin Yuhong Zhou Shuang Zhang Xiaofeng Sun Mingjun Zhang Jiuwei Cui Weijia Fang Kangsheng Gu Zhihua Li jufeng wang Xiaobing Chen Jun Yao Jun Zhou Gang wang Yuxian Bai Juxiang Xiao Wensheng Qiu Bangmao wang Tao Xia Chunyue wang Li Kong Jiajun Yin Tao Zhang Xionghu Shen Deliang Fu Chuntao Gao Huan wang Quanren wang Liwei wang Oncology Department and State Key Laboratory of Systems Medicine for Cancer of Shanghai Cancer Institute Renji HospitalSchool of MedicineShanghai Jiaotong UniversityShanghaiChina GI Cancer Center Nanjing Tianyinshan HospitalChina Pharmaceutical UniversityNanjingChina Medical Oncology Zhongshan Hospital Affiliated with Fudan UniversityShanghaiChina Department of Biotherapy West China School of Medicine/West China Hospital of Sichuan UniversityChengduChina Internal Medicine Jiangsu Cancer Hospital&Jiangsu Institute of Cancer Research&The Affiliated Cancer Hospital of Nanjing Medical UniversityNanjingChina Medical Oncology The Second Affiliated Hospital of Anhui Medical UniversityHefeiChina Department of Oncology The First Hospital of Jilin UniversityChangchunChina Medical Oncology III The First Affiliated HospitalZhejiang University School of MedicineHangzhouChina Medical Oncology The First Affiliated Hospital of Anhui Medical UniversityHefeiChina Department of Oncology Sun Yat-sen Memorial HospitalSun Yat-sen UniversityGuangzhouChina Department of Oncology The Affiliated Cancer HospitalZhengzhou UniversityZhengzhouChina Department of Oncology The First Affiliated Hospital of Henan University of Science and TechnologyLuoyangChina Department of Gastrointestinal Oncology Peking University Cancer Hospital&InstituteBeijingChina Department of Oncology The First Affiliated Hospital of USTC Anhui Provincial HospitalHefeiChina Department of Oncology Harbin Medical University Cancer HospitalHarbinChina Medical Oncology The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’anChina Department of Oncology The Affiliated Hospital of Qingdao UniversityQingdaoChina Department of Gastroenterology Tianjin Medical University General HospitalTianjinChina Division of Gastrointestinal and Pancreatic Surgery Zhejiang Provincial People’s HospitalHangzhouChina Medical Oncology The First Affiliated Hospital of Xiamen UniversityXiamenChina Department of Oncology Shandong Cancer Hospital a

Liposomal irinotecan has shown promising antitumor activity in patients with advanced or metastatic pancreatic ductal adenocarcinoma (PDAC) who have undergone prior gemcitabine-based therapies. This randomized, double-blind, parallel-controlled, multicenter phase 3 study (NCT05074589) assessed the efficacy and safety of liposomal irinotecan HR070803 combined with 5-fluorouracil (5-FU) and leucovorin (LV) in this patient population. Patients with unresectable, locally advanced, or metastatic PDAC who had previously received gemcitabine-based therapies were randomized 1:1 to receive either HR070803 (60 mg/m^(2) anhydrous irinotecan hydrochloride, equal to 56.5 mg/m^(2) free base) or placebo, both in combination with 5-FU (2000 mg/m^(2)) and LV (200 mg/m^(2)), all given intravenously every two weeks. The primary endpoint of the study was overall survival (OS). A total of 298 patients were enrolled and received HR070803 plus 5-FU/LV (HR070803 group, n = 149) or placebo plus 5-FU/LV (placebo group, n = 149). Median OS was significantly improved in the HR070803 group compared to the placebo group (7.4 months [95% CI 6.1–8.4] versus 5.0 months [95% CI 4.3–6.0];HR 0.63 [95% CI 0.48–0.84];two-sided p = 0.0019). The most common grade ≥ 3 adverse events in the HR070803 group were increased gamma-glutamyltransferase (19.0% versus 11.6% in placebo group) and decreased neutrophil count (12.9% versus 0 in placebo group). No treatment-related deaths occurred in the HR070803 group, while the placebo group reported one treatment-related death (abdominal infection). HR070803 in combination with 5-FU/LV has shown promising efficacy and manageable safety in advanced or metastatic PDAC in the second-line setting, representing a potential option in this patient population.

关键词： metastatic adenocarcinoma sided