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| 1 | 用于现场老化交联聚乙烯电力电缆的降解评估参数(英文)显示文摘The cables are more likely to deteriorate after several years of service in Shanghai,a city with a humid climate and abundant rainfall.Before assessing the aging status of those cables,it is critical to present effective test parameters which are sensitive to the aging process under special field conditions.Therefore,we have performed water tree investigation,tensile test,and differential scanning calorimetry(DSC)test on hundreds of cable samples removed from service.A large number of typical bowtie water trees were found in cable insulation and the water tree content was proposed to characterize the degree of water treeing.Based on Arrhenius Equation and equivalent thermal history parameters estimated from DSC profiles,we also proposed a new parameter ln(t/τθ)to characterize the aging status of cable insulation,Where,t is treated duration andτθis the thermal life under treated temperature.The applicabilities of water tree content,tensile strength,and ln(t/τθ)are tested using the analysis of variance(ANOVA).Then we investigated the relationship between the tensile strength and the water tree content using regression analysis,and analyzed the relationship between ln(t/τθ)and the tensile strength.The results indicated that each of these parameters performs differently with cables which experienced different degrees of age related degradation,and can be used to identify the aging status of field aged cables.The tensile strength can reflect the water treeing condition of field aged cables very well as a commonly used functional parameter.Since ln(t/τθ)is strongly related to the tensile strength,it is an effective parameter to characterize the aging status of field aged cable insulation.Using this newly proposed parameter is more time saving because of the convenience in sampling. | LIU Fei JIANG Pingkai LEI Qingquan ZHANG Li | 2015 | 高电压技术2015，41，4： | 7 |
| 2 | Unique catalysis of Ni-Al hydrotalcite derived catalyst in CO_2 methanation: cooperative effect between Ni nanoparticles and a basic support显示文摘Ni-Al hydrotalcite derived catalyst(Ni-Al2O3-HT) exhibited a narrow Ni particle-size distribution with an average particle size of 4.0 nm.Methanation of CO2 over this catalyst initiated at 225℃ and reached 82.5% CO2 conversion with 99.5% CH4 selectivity at 350℃, which was much better than its impregnated counterpart. Characterizations by means of CO2 microcalorimetry and 27Al NMR indicated that large amount of strong basic sites existed on Ni-Al2O3-HT, originated from the formation of Ni-O-Al structure. The existence of strong basic sites facilitated the activation of CO2 and consequently promoted the activity. The combination of highly dispersed Ni with strong basic support led to its unique and high efficiency for this reaction. | Lei He Qingquan Lin Yu Liu Yanqiang Huang | 2014 | Journal of Energy Chemistry2014，23，5： | 5 |
| 3 | Effect of temperature on electric-thermal properties of semiconductive shielding layer and insulation layer for high-voltage cable显示文摘A semi‐conductive shielding layer plays an important role in the uniform electric field for a high‐voltage cable.The electric‐thermal properties of the semi‐conductive layer and insulation layer directly affect the overall insulation performance of the cable.The physicochemical performances of semi‐conductive composites are firstly analysed herein.Furthermore,electric‐thermal properties of the semi‐conductive layer and insulation layer are discussed.The experimental results show that the thermal conductivity of the commercial semi‐conductive layer is about twice that of the insulation layer,owing to the effect of carbon black.The thermal expansion coefficient of the insulation layer rises from 1.86×10^(−4)/K at 25℃ to 3.20×10^(−4)/K at 90℃.By contrast,the semi‐conductive layer begins to slowly decline at a certain temperature,and decreases signif-icantly to 2.25×10^(−4)/K at 80℃,owing to the effect of ethylene‐vinyl acetate copolymer(EVA).The electrical experiments show that the resistivity of semi‐conductive composite gradually rises with an increase in temperature,and gradually declines with an increase in the carbon black content.The dc breakdown strength of the composite structure of the semi‐conductive layer/insulation layer decreases significantly with an increase in tem-perature,decreasing from 307 kV/mm at 25℃ to 203 kV/mm at 90℃.At four typical temperatures,the breakdown strength reaches the maximum value when the carbon black content is 25 phr.It is about 15%and 19%higher than carbon black contents of 20 and 30 phr.These findings have reference significance for high‐voltage cable breakdown fault analysis and material selection in cable design. | Yanhui Wei Mingyue Liu Xuejing Li Guochang Li Naiyi Li Chuncheng Hao Qingquan Lei | 2021 | High Voltage2021，6，5： | 3 |
| 4 | The chromosome-level Stevia genome provides insights into steviol glycoside biosynthesis显示文摘Stevia(Stevia rebaudiana Bertoni)is well known for its very sweet steviol glycosides(SGs)consisting of a common tetracyclic diterpenoid steviol backbone and a variable glycone.Steviol glycosides are 150–300 times sweeter than sucrose and are used as natural zero-calorie sweeteners.However,the most promising compounds are biosynthesized in small amounts.Based on Illumina,PacBio,and Hi-C sequencing,we constructed a chromosome-level assembly of Stevia covering 1416 Mb with a contig N50 value of 616.85 kb and a scaffold N50 value of 106.55 Mb.More than four-fifths of the Stevia genome consisted of repetitive elements.We annotated 44,143 high-confidence protein-coding genes in the high-quality genome.Genome evolution analysis suggested that Stevia and sunflower diverged~29.4 million years ago(Mya),shortly after the whole-genome duplication(WGD)event(WGD-2,~32.1 Mya)that occurred in their common ancestor.Comparative genomic analysis revealed that the expanded genes in Stevia were mainly enriched for biosynthesis of specialized metabolites,especially biosynthesis of terpenoid backbones,and for further oxidation and glycosylation of these compounds.We further identified all candidate genes involved in SG biosynthesis.Collectively,our current findings on the Stevia reference genome will be very helpful for dissecting the evolutionary history of Stevia and for discovering novel genes contributing to SG biosynthesis and other important agronomic traits in future breeding programs. | Xiaoyang Xu Haiyan Yuan Xiaqing Yu Suzhen Huang Yuming Sun Ting Zhang Qingquan Liu Haiying Tong Yongxia Zhang Yinjie Wang Chunxiao Liu Lei Wu Menglan Hou Yongheng Yang | 2021 | Horticulture Research2021，8，1： | 2 |
| 5 | Research progress of semiconductive shielding layer of HVDC cable显示文摘As an indispensable part of high-voltage direct current(HVDC)cable,the semiconductive shielding layer plays the role of uniforming electric field in the cable.However,cable shielding materials>35 kV mainly rely on foreign imports in China,which belongs to the technical weak issues in the field of electrical materials.At present,there are few systematic reports on semiconductive shielding material of HVDC cable.In the work,the mechanisms of charge conduction and thermal conduction of semiconductive material have been introduced.Effect of raw material,carbon black content and the second conductive filler on the resistance characteristics of the semiconductive layer,the charge accumulation characteristics of the insulating layer and the interface characteristics have been studied.A kind of semiconductive layer as a high voltage terminal charge emission method has been proposed to study charge emission from the semiconducting layer to the insulation layer.This work can provide theoretical guidance for the research of semiconductive shielding materials. | Yanhui Wei Wang Han Guochang Li Qingquan Lei Mingli Fu Chuncheng Hao Guanjun Zhang | 2020 | High Voltage2020，5，1： | 2 |
| 6 | The property and microstructure study of Polyimide/Nano-TiO 2 Hybrid Films with sandwich structures显示文摘 | Xiaoxu Liu Jinghua Yin Yunan Kong Minghua Chen Yu Feng Zhonghua Wu Bo Su Qingquan Lei | 2013 | Thin Solid Films2013，，： | 1 |
| 7 | Microstructure and dielectric property study of Polyimide/BaTiO 3 nanocomposite films显示文摘 | Minghua Chen Jinghua Yin Xiaoxu Liu Yu Feng Bo Su Qingquan Lei | 2013 | Thin Solid Films2013，，： | 1 |
| 8 | Insulation Diagnosis of Service Aged XLPE Power Cables Using Statistical Analysis and Fuzzy Inference显示文摘Cables that have been in service for over 20 years in Shanghai, a city with abundant surface water, failed more frequently and induced different cable accidents. This necessitates researches on the insulation aging state of cables working in special circumstances. We performed multi-parameter tests with samples from about 300 cable lines in Shanghai. The tests included water tree investigation, tensile test, dielectric spectroscopy test, thermogravimetric analysis (TGA), fourier transform infrared spectroscopy (FTIR), and electrical aging test. Then, we carried out regression analysis between every two test parameters. Moreover, through two-sample t-Test and analysis of va- riance (ANOVA) of each test parameter, we analyzed the influences of cable-laying method and sampling section on the degradation of cable insulation respectively. Furthermore, the test parameters which have strong correlation in the regression analysis or significant differ- ences in the t-Test or ANOVA analysis were determined to be the ones identifying the XLPE cable insulation aging state. The thresholds for distinguishing insulation aging states had been also obtained with the aid of statistical analysis and fuzzy clustering. Based on the fuzzy in- ference, we established a cable insulation aging diagnosis model using the intensity transfer method. The results of regression analysis indicate that the degradation of cable insulation accelerates as the degree of in-service aging increases. This validates the rule that the in- crease of microscopic imperfections in solid material enhances the dielectric breakdown strength. The results of the two-sample t-Test and the ANOVA indicate that the direct-buried cables are more sensitive to insulation degradation than duct cables. This confirms that the tensile strength and breakdown strength are reliable functional parameters in cable insulation evaluations. A case study further indicates that the proposed diagnosis model based on the fuzzy inference can reflect the comprehensive aging state of cable insulation well, and that the cable service time has no correlation with the insulation aging state. | LIU Fei JIANG Pingkai LEI Qingquan ZHANG Li SU Wenqun | 2013 | 高电压技术2013，39，8： | 1 |
| 9 | Investiga-tion of electrical properties of LDPE/ZnO nanocomposite dielec-trics 显示文摘 | TIAN Fuqiang LEI Qingquan WANG Xuan | 2012 | IEEE Transactions on Dielectrics and Electrical Insula-tion2012，19，3： | 1 |
| 10 | Preparation and properties of KH550-Al 2 O 3 /PI–EP nanocomposite material显示文摘 | Yufei Chen Wei Yue Zongzhen Bian Yong Fan Qingquan Lei | 2013 | Iranian Polymer Journal2013，，5： | 1 |
| 11 | Understanding insulation failure of nanodielectrics:tailoring carrier energy显示文摘Owing to the formation of interface and new feature of which, the properties of nanodielectrics can be improved. ‘Hard/soft interface’ and its trap distribution can be tailored by functionalised groups. Molecular simulation results show that the interaction energy and electrostatic potential are larger for the soft interface, which indicates the greater bonding strength with the polymer matrix and electrostatic force on charge carriers. Charge transport simulation indicates that the accumulation of homo-charges would form a reverse electric field and distort electric field distribution. The injection depth would be restricted at the vicinity of sample/electrodes due to the greater trapping effect of deep traps, thus weakening the distortion in the sample bulk, thereby decreasing carrier energy and delaying the formation of impact ionisation. Based on the accumulation of carrier energy Φ = Eeλ, the idea of suppressing electron free path and carrier energy to enhance the insulation breakdown is confirmed. The classified effects of nanofillers during dc breakdown and corona-resistant are further understood from carrier energy. The introduced interfacial trap is effective in trapping carriers due to the low carrier energy under dc voltage, while ineffective in blocking the energetic charges during corona-discharge, but nanoparticles exert blocking and scattering effect against the energetic charges. | Shengtao Li Dongri Xie Qingquan Lei | 2020 | High Voltage2020，5，6： | 1 |
| 12 | Modified isothermal discharge current theory and itsapplication in the determination of trap level distribution in polyimide films显示文摘 | Lei Qingquan Tian Fuqiang Yang Chun | 2010 | Journal of Electrostatics2010，68，3： | 1 |
| 13 | Tunable Reactive Wetting of Sn on Microporous Cu Layer显示文摘Wetting of microporous Cu layer by liquid Sn resulted in contact angles from 0 to 33 deg., tunable by varying wetting temperature and porous microstructure. The wetting was dominated by the interfacial metallurgical reaction, which can lead to pore closure phenomenon, as the liquid infiltration facilitating the wetting process. | Qingquan Lai Lei Zhang Cai Chen J.K.Shang | 2012 | Journal of Materials Science & Technology2012，28，4： | 1 |
| 14 | Modified isothermal discharge current theory and its application in the determination of trap level distribution in polyimide films 显示文摘 | Lei Qingquan Tian Fuqiang Yang Chun | 2010 | Journal of E- lectrostatics2010，68，3： | 1 |
| 15 | Comparison Between Thermally Stimulated Discharge Method and Photo-stimulated Discharge Method for Measuring Space Charge Traps Energy显示文摘The space charge behavior of a dielectric under HVDC is influenced by the charge trap energy distribution in it. Hence, we in- vestigated the charge trap distributions in several kinds of typical polymer materials using thermally stimulated discharge (TSD) and photo-stimulated discharge (PSD) methods, respectively. The experimental results show that,there is a significant difference between the trap energy distributions obtained by the two methods, but the difference decreases with the increase of the melting point of polymers. This is attributed to the change of the trap center environment during TSD caused by the increasing movements of both main chains and branched chains in polymers. PSD method is more accurate for investigating charge trap distribution in dielectrics, especially for polymers with low melting points. | ZHU Zhi'en ZHANG Yewen AN Zhenlian ZHENG Feihu LEI Qingquan | 2013 | 高电压技术2013，39，8： | 1 |
| 16 | PtZn nanoparticles supported on porous nitrogen-doped carbon nanofibers as highly stable electrocatalysts for oxygen reduction reaction显示文摘The oxygen reduction reaction(ORR)electrocatalytic activity of Pt-based catalysts can be significantly improved by supporting Pt and its alloy nanoparticles(NPs)on a porous carbon support with large surface area.However,such catalysts are often obtained by constructing porous carbon support followed by depositing Pt and its alloy NPs inside the pores,in which the migration and agglomeration of Pt NPs are inevitable under harsh operating conditions owing to the relatively weak interaction between NPs and carbon support.Here we develop a facile electrospinning strategy to in-situ prepare small-sized PtZn NPs supported on porous nitrogen-doped carbon nanofibers.Electrochemical results demonstrate that the as-prepared PtZn alloy catalyst exhibits excellent initial ORR activity with a half-wave potential(E_(1/2))of 0.911 V versus reversible hydrogen electrode(vs.RHE)and enhanced durability with only decreasing 11 mV after 30,000 potential cycles,compared to a more significant drop of 24 mV in E_(1/2)of Pt/C catalysts(after 10,000 potential cycling).Such a desirable performance is ascribed to the created triple-phase reaction boundary assisted by the evaporation of Zn and strengthened interaction between nanoparticles and the carbon support,inhibiting the migration and aggregation of NPs during the ORR. | Lei Zhao Jinxia Jiang Shuhao Xiao Zhao Li Junjie Wang Xinxin Wei Qingquan Kong Jun Song Chen Rui Wu | 2023 | Nano Materials Science2023，5，3： | 0 |
| 17 | Germplasm of breeding Pseudosciaena crocea as revealed by microsatellite markers显示文摘The germplasm of breeding large yellow croaker(Pseudosciaena crocea Richardson)was revealed using 12 microsatellite markers.The results showed that the genetic diversities were on a mediated level in the bred Daiqu and Min-Yue stocks and two hybrid groups,as represented by 4.83 of the mean number of alleles and 0.561 of the average observed heterozygosity.The value of pairwise differentiation coefficient(FST)was only 13.1% between Daiqu and Min-Yue stocks,demonstrating the low level of differentiation and a close relationship.However,STRUCTURE simulations and phylogenetic tree based on the UPGMA method supported that they are geographically different populations of the same species with distinct genetic structures.Examinations of individual admixture showed that Min-Yue stock had been contaminated by alien individuals.Moreover,the genetic structures of the two hybrid groups resembled those of their parents,especially affected more by their female parents.Finally,the values of average observed heterozygosity between parents and their ascendants were compared and tested,as a result of no detectable differences(P>0.05). | CHANG Yumei DING Lei LI Mingyun XUE Liangyi LIANG Liqun HE Jianguo LEI Qingquan | 2008 | Acta Oceanologica Sinica2008，27，4： | 0 |
| 18 | Insulation structure design and electric field simulation of 500 kV isolation energy supply transformer for HVDC breaker显示文摘The high‐voltage isolated energy supply transformer(HIET)is the key component of the HVDC breaker,which is used for energy transmission and the potential isolation.There is a lack of research results that can meet engineering applications at home and abroad.The design of a 500 kV HIET with dry‐type insulation is proposed,using 10 cascade connected 50 kV sub‐transformers(STs),which uses silicon rubber suitable for DC voltage as the main insulation material.High‐voltage(HV)winding of ST adopts double‐shielding structure of coil semi‐conductive shielding and inner semi‐conductive shielding to improve electric field distribution.The simulation analysis of an electric field at different insulation thicknesses and temperatures shows that the electric field decreases with an increase in thickness of insulation.When the thickness is greater than 25 mm,the electric field reduction effect is significantly weakened.The electric field is closely related to temperature,when at 20℃,the electric field between double‐shielding is relatively uniform.When at 70℃,the inner shielding electric field is much higher than coil shielding,and undergoes obvious reversal.In addition,the 500 kV HIET's electric field has been analysed.The 500kV HIET prototype has been manufactured and passed the type test,and successfully applied to the 500 kV Zhangbei DC grid project. | Sheng Zhang Yadong Fan Qingquan Lei Jianguo Wang Yuan Liu Ting Zhan | 2022 | High Voltage2022，7，1： | 0 |
| 19 | Simultaneous Thermoluminescence and Thermally Stimulated Current in Polyamide显示文摘We have obtained simultaneous thermoluminescence (TL) and thermally Stimulated current (TSC) spectra in two types of polyamide film, such as nylons 6 and 11 under study of electron detrapping and recombination. There are three main relaxation peaks or regions, designated γ,β and α in order of increasing temperature in the TSC spectra, in contrast, a high temperature relaxation peak in TL spectra disappears. The centers or peaks of these relaxation regions are located at near 180, 230 and 310 K, respectively, deviating±10 K. However. we also observed two anomalous phenomena: first, a very large, short-circuited, thermally stimulated discharge current (TSDC) up to 10-8 A, but reversible in direction for non-polarized nylons 6 and 11, even after several times repeatedly; secondly, no TL signal except for non-polarized nylon 6 film. | Fan, Yong Wang, Xuan Zhang, Xiaohong Lin, Jiaqi Lei, Qingquan
| 1998 | Journal of Materials Science & Technology1998，14，4： | 0 |
| 20 | Effect of graphene modified semi-conductive shielding layer on space charge accumulation in insulation layer for high-voltage direct current cable显示文摘Space charge accumulation in the insulation layer of high-voltage direct current(HVDC)cable is one of the key factors restricting the development of HVDC cable.The inner semi-conductive layer as an important structure of cable will affect the charge accumu-lation characteristics in the insulation layer.This work intends to explore the method of modifying the semi-conductive layer with graphene,to suppress charge accumulation in the insulation layer.First,the semi-conductive layer with different contents of Graphene(G)and carbon black(CB)are prepared.Second,the morphology and surface roughness of the cross section are analysed.Further,the effects of the semi-conductive layer on space charge accumulation of the insulation layer are studied by pulsed electro-acoustic method and thermal stimulation depolarisation current method.The experimental re-sults show that a moderate amount of graphene replacing CB can effectively reduce charge accumulation in the insulation layer and inhibit positive temperature coefficient(PTC)effect at the same time.The surface roughness of specimens decreases with the increase of G content from 0 to 3 phr(parts per hundreds of resin),when the CB content decreases from 25 to 10 phr,the surface roughness of specimen increases.The resistivity test shows that doping G can significantly inhibit the PTC effect of the semi-conductive layer.The volume resistivity of the semi-conductive layer decreases with the increase of G content and CB content.In addition,charge accumulation of the insulation layer rises and then drops under the action of the semi-conductive layer. | Guochang Li Xuejing Li Fan Zhang Xiaojian Liang Mingyue Liu Yanhui Wei Shengtao Li Chuncheng Hao Qingquan Lei | 2022 | High Voltage2022，7，3： | 0 |
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