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Influence of thermal ageing on high-field polarisation characteristics and conductivity behaviour of submarine polymeric cables insulation

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High Voltage 2023年第1期8卷 138-148页

作者： Xize Dai jian Hao Gian Carlo Montanari zheng jian Ruijin Liao Xinlong zheng State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina Department of Energy Aalborg UniversityAalborgDenmark Center for Advanced Power Systems Florida State UniversityTallahasseeFloridaUSA Shinan Power Supply Branch Company of State Grid Chongqing Electric Power Company NananChina Zhoushan Power Supply Branch Company of State Grid Zhejiang Electric Power Company ZhoushanChina

Diagnosing insulation intrinsic ageing is essential for preventing insulation failure of submarine cables,and in case of failure,helping in any decision about maintenance *** this study,a novel aged cable diagnosis approach based on high-voltage frequency domain spectroscopy(HV-FDS)with broader frequency width is proposed to analyse the high-field polarisation characteristics and conductivity behaviour of 500 kV submarine polymeric cables insulation,aiming to support the evaluation of overall insulation *** measurement principle of HV-FDS and relaxation mechanism are stated,and then focus is on studying the extent of change of polarisation and conduction properties of submarine cables insulation as a function of ageing stress and ***,the high-field polarisation characteristics and conductivity behaviour are discussed in-depth based on the carrier transport and trap ***,the novel diagnostic indicator based on the high-field characteristics is extracted to quantify the thermal ageing state of submarine cables *** show that the high-field polarisation characteristics and conductivity behaviour seem to become sensitive diagnostic quantities if measured at reasonably high voltage,which are able to reveal mechanisms associated with thermo-oxidative ageing as that generated in the testing procedure considered in this *** is considerably higher than that experienced in typical dielectric spectroscopy approaches.

关键词： behaviour insulation characteristics

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Mesoscopic analysis of the utilization of hardening model for a description of softening behavior based on disturbed state concept theory

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第9期9卷 1167-1175页

作者： jian-ye zheng An-li WU Guangzhou Metropolis Construction Commission Guangzhou 510030 China College of Civil Engineering and Architecture lnner Mongolia University of Technology Hohhot 010051 China

Mesoscopic characteristics of a clayey soil specimen subjected to macroscopic loading are examined using a medi- cal-use computerized tomography (CT) instrument. Disturbed state concept (DSC) theory is based on the utilization of the hard- ening model. DSC indirectly describes material behavior by claiming that the actual response of the material is expressed in terms of the relative intact (RI) response and the fully adjusted (FA) response. The occurrence of mesoscopic structural changes of material has similarities with the occurrence of a macroscopic response of the material under loadings. In general, the relative changing value of a softening material is three to five times more than that of a hardening material. Whether special zones exist or not in a specimen cross section does not affect the following conclusion: hardening material and softening material show me- chanical differences with CT statistical indices values prominently changing, and the change is related to the superposing of a disturbance factor. A new disturbance factor evolution function is proposed. Thus, mesoscopic statistical indices are introduced to describe macroscopic behavior through the new evolution function. An application of the new evolution function proves the effectiveness of the amalgamation of a macroscopic and a mesoscopic experimental phenomenon measurement methods.

关键词： Constitutive model Disturbed state concept (DSC) Computerized tomography (CT) Softening

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Experimental investigation on pressure-buildup characteristics of a water lump immerged in a molten lead pool

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Nuclear Science and Techniques 2023年第3期34卷 25-39页

作者： Zi-jian Deng Song-bai Cheng Hui Cheng Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China

Motivated to understand the pressure-buildup characteristics in a circumstance of a water droplet immerged inside a heavy liquid metal pool,which is a key phenomenon during a Steam Generator Tube Rupture accident of Lead-cooled Fast Reactor,many experiments have been conducted by injecting water lumps into a molten lead pool at Sun Yat-sen *** order to deepen the understanding of the influence of melt material,this lead experiment was compared with a Lead-Bismuth-Eutectic(LBE)experiment in the *** both experiments,a steam explosion occurred in a small part of the experi-mental runs,which generally leads to strengthened pressure *** the non-explosion experimental cases,the impact of all parameters employed in lead experiments(i.e.,water lump volume,water lump shape,molten pool depth,and temperature of water and melt)on the pressure buildup is non-negligible and similar to that in our previous experiments using ***,limited pressure buildup with an increase in water lump volume was also observed.A slightly more violent pressure buildup tends to appear in the lead experiments than in the LBE experiments under the same experimental conditions,which may be due to the higher thermal conductivity of lead than of *** a few experimental runs with a relatively low melt temperature close to the melting point of lead,local solidification of liquid lead was observed,restricting pressure *** the lead and LBE experiments,the calculated melt kinetic energy conversion efficiencyηhas a relatively small value(not exceeding 1.6%),and theηvalues have an overall positive correlation with the impulse on the molten pool.

关键词： Lead-cooled fast reactor Steam generator tube rupture accident Pressure-buildup characteristics Experimental study Melt material

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Insight into the change in carbon structure and thermodynamics during anthracite transformation into graphite

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International Journal of Minerals,Metallurgy and Materials 2020年第2期27卷 162-172页

作者： Tian Qiu jian-guo Yang Xue-jie bai National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China

The thermodynamic and kinetic mechanisms of Taixi anthracite during its graphitization process were *** understand the variation trends of carbon arrangement order,microcrystal size,and graphitization degree against temperature during the graphitization process,a series of experiments were performed using Raman spectroscopy and X-ray diffraction(XRD).Subsequently,the influencing factors of the dominant reaction at different temperatures were analyzed using thermodynamics and *** results showed that the graphitization process of Taixi anthracite can be divided into three stages from the perspective of reaction thermodynamics and *** played a crucial role in the formation and growth of a graphitic ***,multivariate mechanisms coexisted in the graphitization *** ultrahigh temperatures,the defects of synthetic graphite could not be completely eliminated and perfect graphite crystals could not be *** low temperatures,the reaction is mainly controlled by dynamics,while at high temperatures,thermodynamics dominates the direction of the reaction.

关键词： anthracite graphitization thermodynamics kinetics

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Tunable luminescence in co-doped Zn3Al2Ge2O10:Cr3+by controlling crystal field splitting and nephelauxetic effect

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Journal of Rare Earths 2020年第12期38卷 1265-1272页

作者： Qiongyu bai Suling Zhao zheng Xu Panlai Li Key Laboratory of Luminescence and Optical Information(Beijing Jiaotong University) Ministry of EducationBeijing 100044China Institute of Optoelectronics Technology Beijing Jiaotong UniversityBeijing 100044China College of Physics Science&Technology Hebei Key Lab of Optic-Electronic Information and MaterialsHebei UniversityBaoding 071002China

Ce3+/Dy3+/Tb3+/Eu3+/Mn2+and Cr3+ions co-doped Zn3 Al2 Ge2 O10 phosphor were prepared by a hightemperature solid-state method.X-ray diffraction patterns prove the cubic phase structure of prepared Zn3 Al2 Ge2 O10 phosphor,Emission,excitation spectra and decay curves confirm the tunable *** degrees of the decrease of emission FWHM in Zn3 Al2 Ge2 O10:0.02 Cr3+,RE(RE=Ce3+,Dy3+,Tb3+,Eu3+)and Zn3 Al2 Ge2 O10:0.02 Cr3+,Mn2+are *** reason of variable FWHM is the effect of crystal field splitting and nephelauxetic effect,and the nephelauxetic effect is ***,the emission FWHM decreases with the increasing concentration of Mn2+/Tb3+/Eu3+in Zn3 Al2 Ge2 O10:0.02 Cr3+,and for Zn3 Al2 Ge2 O10:0.02 Cr3+,Ce3+and Zn3 Al2 Ge2 O10:0.02 Cr3+,Dy3+,it is a *** variation of Zn3 Al2 Ge2 O10:0.02 Cr3+,Tb3+is more obvious than that of Zn3 Al2 Ge2 O10:0.02 Cr3+,Eu3+,because Tb3+ion has smaller ***,the tunable luminescence of Cr3+can be realized by co-doping different *** these phosphors have potential applications in light-emitting diodes for plant growth.

关键词： Iuminescence Zn3Al2Ge2O10:Cr3+ Co-doping Ions Rare earths

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New Disperse Dyes for Polyester Microfibres

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Chinese Chemical Letters 2003年第2期14卷 118-120页

作者： Wei jian Lu bai CHENG State Key Laborotary of Fine Chemicals Dalian University of TechnologyDalian 116012

A series of disperse dyes bearing ether groups have been synthesized. The visible absorption spectra of them were studied, their fastness on polyester microfibres were investigated.

关键词： Disperse dye ether group microfibres.

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Grignard Addition to Quinoxalinium Salt: Synthesis of 1, 2-Dihydro-quinoxaline and 1, 2, 3, 4-Tetrahydroquinoxaline Derivatives

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Chinese Chemical Letters 2006年第2期17卷 165-168页

作者： Lian You zheng Xu bai The Center for Combinatorial Chemistry and Drug Discovery Jilin University Changchun 130012

Grignard additions to a quinoxalinium salt were studied. Depending on the ratio of the reagents and reaction temperature, 1, 2, 3, 4-tetrahydroquinoxaline and 1, 2-dihydroquinoxaline derivatives could be resulted sele... 详细信息

关键词： Grignard addition quinoxalinium salt dihydroquinoxaline tetrahydroquinoxaline.

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Fever and neck pain after pacemaker lead extraction: A case report

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World Journal of Clinical Cases 2019年第15期7卷 2103-2109页

作者： Shao-Xian Wang jian bai Rui Ma Rong-Fang Lan Jia zheng Wei Xu Department of Cardiology Nanjing Drum Tower HospitalClinical College of Nanjing Medical UniversityNanjing 210008Jiangsu ProvinceChina Department of Cardiology Nanjing Drum Tower HospitalNanjing University Medical SchoolNanjing 210008Jiangsu ProvinceChina

BACKGROUND Venous thrombosis(VT) is one of the minor complications of pacemaker lead extraction. It is often found due to the swelling of the limbs after the extraction. It is easy to be neglected or even misdiagnosed in the absence of typical clinical symptoms. The incidence, risk factors, and long-term impact of this complication are still unclear. Herein, we report a case of deep VT caused by transvenous lead extraction, which is easily *** SUMMARY A 66-year-old woman underwent a pacemaker lead extraction at our hospital because of a pacemaker pocket infection. After the extraction, she began to experience intermittent fever accompanied by sweating. The highest body temperature recorded was 37.9℃. Additionally, she reported migratory pain that made her uncomfortable. The pain was mistakenly thought to be caused by operation trauma. At first, the pain radiated from the left chest to the ***, the pain in the left chest was alleviated, but pain in the left neck and throat appeared. Finally, the pain was confined to the mandible and a submandibular mass was palpated with no other abnormalities upon physical *** tomography venography and angiography finally indicated that the fever and pain were the symptoms of thrombophlebitis caused by lead *** patient was then treated with rivaroxaban for more than three months and has shown no symptoms since she left the *** The possibility of thrombosis should be considered when pain and recurrent fever occur after pacemaker lead extraction.

关键词： Venous thrombosis Lead extraction Neck pain Fever Anticoagulants Case report

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Design of new format for mass data compression

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The Journal of China Universities of Posts and Telecommunications 2011年第1期18卷 121-128页

作者： QIN jian-cheng bai Zhong-ying School of Computer Science Beijing University of Posts and Telecommunications Beijing 100876 China

In the field of lossless compression, most kinds of traditional software have some shortages when they face the mass data. Their compressing abilities are limited by the data window size and the compressing format design. This paper presents a new design of compressing format named ＇CZ format＇ which supports the data window size up to 4 GB and has some advantages in the mass data compression. Using this format, a compressing shareware named ＇ComZip＇ is designed. The experiment results support that ComZip has better compression ratio than WinZip, Bzip2 and are compressed. And ComZip has the potential to beat 7-zip in WinRAR in most cases, especially when GBs or TBs of mass data future as the data window size exceeds 128 MB.

关键词： mass data coding tossless compression LZ77/LZSS algorithm arithmetic coding

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An analytical solution to estimate the settlement of tailings or backfill slurry by considering the sedimentation and consolidation

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International Journal of Mining Science and Technology 2021年第3期31卷 463-471页

作者： Jiahao Qin jian zheng Li Li Research Institute of Mining and Environment(RIME UQAT-Polytechnique) Department of CivilGeological and Mining EngineeringMontréalQuébec H3C 3A7Canada

A common and important task in mining industry is to estimate the settlement or final volume of the tailings or backfill associated with sedimentation and self-weight consolidation. Up to now however, most existing analytical solutions were developed by only considering the settlement induced by consolidation. In this paper, the process of shrinkage tests has been compared with those of sedimentation and consolidation. It was shown that the pore water and particles movement in the sedimentation are very similar to that in the normal shrinkage. The void ratio at the end of sedimentation is thus for the first time considered to be equal to the void ratio at desaturation onset of shrinkage tests. An analytical solution was then proposed to estimate the settlement of tailings or backfill by considering the sedimentation and consolidation. To validate the proposed analytical solution, tailing deposition tests were conducted in two molds to simulate the tailings impoundment and underground mine stope. The required parameters were obtained through shrinkage and consolidation tests. Good agreements were obtained between the measured settlements and those calculated by the proposed solution. The proposed solution can thus be considered as validated and used to evaluate the settlement of tailings or backfill slurry.

关键词： Shrinkage Sedimentation Consolidation Settlement Tailings Backfill

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