期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到6,680篇文章
< 1 2 … 250 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Characterization of the susceptibility of ore particles to breakdown in high voltage pulse breakage and the influencing factors 认领 引用
1
作者 Rui Sun Yang Hong +5 位作者 Daqian Wang Liang Si Jianguo Yang Wei Huang Liefeng Huang Weiran Zuo 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第1期113-124,共12页
The susceptibility of ore particles to electrical breakdown plays a critical role for high voltage pulse(HVP)breakage,yet its quantitative characterization still lacks deep understanding.Two indicators,namely breakdow... The susceptibility of ore particles to electrical breakdown plays a critical role for high voltage pulse(HVP)breakage,yet its quantitative characterization still lacks deep understanding.Two indicators,namely breakdown delay time(Td)and breakdown strength(Eb)were compared,based on analysis on the two breakdown modes namely wavefront mode and post-wave mode.It was found that Td is more suitable to characterize the susceptibility of ore particles to electrical breakdown in HVP breakage than Eb.A probabilistic model based on the Weibull distribution is developed to describe the relation of breakdown probability to Td.Regression analyses were conducted to investigate how operating parameters and particle properties influence Td and size reduction degree of ore particles in HVP breakage.The regressed models demonstrate potential capability to predict metallic minerals content and HVP breakage degree based on operating parameters and particle properties. 展开更多
关键词 Electrical breakdown High voltage pulse breakage Susceptibility Breakdown delay time
暂未订购 下载PDF
Bismaleimide Dielectric Films with Superior High-temperature Breakdown Strength via a Rationally Designed Crosslinked Network for Embedded Film Capacitors 认领 引用
2
作者 Li-Na Huang Li Tan +8 位作者 Shuang-Wu Huang Gu-Qiao Ding Qi-Yan Zhang Meng-Qi Ge Xin-Wei Chen Liang Wu Xiang-Yi Wang Ning Ren Xin-Yuan Zhu 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第8期2561-2569,I0012,共9页
The growing demand for higher operating frequencies,faster speeds,and greater power density in modern electronics has positioned embedded dielectric film capacitors as a key enabler of system miniaturization and enhan... The growing demand for higher operating frequencies,faster speeds,and greater power density in modern electronics has positioned embedded dielectric film capacitors as a key enabler of system miniaturization and enhanced reliability.However,such integration requires dielectric materials that exhibit both high intrinsic breakdown strength and superior high-temperature stability,a combination which is seldom achieved by conventional polymer dielectrics.In this work,we present a rationally designed rigid-flexible crosslinked network based on bismaleimide(BMI)that delivers robust performance under extreme electrical and thermal conditions.By co-curing a biphenyl epoxy(BPEP)resin with a 2,2-bis[4-(4-maleimidophenoxy)phenyl]propane(BMP)-based BMI matrix,a densely co-crosslinked network is formed.In this network,BPEP acts as a toughening agent that mitigates internal stress and inhibits micro-crack initiation,while its rigid biphenyl motifs cooperate with BMP to establish deeper charge traps,thereby effectively suppressing charge carrier excitation and transport.These synergistic mechanisms enable the optimized co-cured BMP/10%BPEP film to achieve a leakage current more than ten times lower than that of pristine BMP at 200℃,along with a remarkable increase in breakdown strength from 509MV/m to 615MV/m and a rise in dielectric constant from 3.45 to 3.71.Consequently,the film exhibits an outstanding discharge energy density of 4.59J/cm3 with 90%efficiency at 200℃,as well as excellent cycling stability over 50000 charge-discharge cycles.This study offers a feasible material design strategy for high-performance polymer dielectrics suitable for embedded capacitors in advanced electronic packaging. 展开更多
关键词 Embedded capacitors Breakdown strength High-temperature Dielectric Energy density
暂未订购 下载PDF
Air-Breakdown Triboelectric Nanogenerator Inspired by Transistor Architecture for Low-Force Human-Machine Interfaces 认领 引用
3
作者 Karthikeyan Munirathinam Longlong Li +2 位作者 Arunkumar Shanmugasundaram Jongsung Park Dong-Weon Lee 《Nano-Micro Letters》 SCIE EI CAS CSCD 2026年第7期775-793,共19页
Human-machine interface(HMI)systems require energy harvesters that can operate efficiently under low contact forces,yet conventional tactile triboelectric nanogenerators(TENGs)suffer from low surface charge density an... Human-machine interface(HMI)systems require energy harvesters that can operate efficiently under low contact forces,yet conventional tactile triboelectric nanogenerators(TENGs)suffer from low surface charge density and unstable output.Here,we propose a human skin electric field-induced air-breakdown TENG(AB-TENG)with a transistor-inspired architecture.The device employs a base terminal to collect electrons from human skin via an ionized air channel formed by air breakdown,enabling efficient conversion of the skin’s electric field through two operational modes:indirect(accumulated output)and direct(instant high output).In direct mode,the AB-TENG delivers 165 V at 2 N and 290 V at 24 N,with a peak power of 22 mW-22 times higher than conventional tactile TENGs.Practical utility is demonstrated through a self-powered infrared remote control and an ultrathin keyboard.This work establishes a new design paradigm that transforms air breakdown from a limitation into a functional mechanism,advancing skin-electricity-enhanced thin-film TENGs toward next-generation self-sustaining HMI platforms. 展开更多
关键词 Skin electrons Air breakdown Electrostatic discharge Low contact force Human-machine interfaces
暂未订购 下载PDF
The MaASR3-MaHDT1 module modulates high-temperature-inhibited chlorophyll breakdown in banana fruit by suppressing the E3 ligase MaNIP1 认领 引用
4
作者 Qi Luo Wei Wei +5 位作者 Yu-mei Zhang Jian-fei Kuang Jian-ye Chen Wang-jin Lu Zhi-jun Cai Wei Shan 《Horticulture Research》 SCIE CSCD 2025年第10期55-64,共10页
The ripening of banana fruit at high temperature(HT)exceeding 24℃ impedes developing yellow peels,causing green ripening,which considerably lowers its marketability.Our recent study found that HT induces E3 ubiquitin... The ripening of banana fruit at high temperature(HT)exceeding 24℃ impedes developing yellow peels,causing green ripening,which considerably lowers its marketability.Our recent study found that HT induces E3 ubiquitin ligase MaNIP1(NYC1 interacting protein 1)-mediated degradation of MaNYC1(NON-YELLOW COLORING 1)to inhibit chlorophyll breakdown during banana fruit ripening,but MaNIP1's upstream regulatory mechanism is still unclear.Herein,the ASR transcription factor(TF)MaASR3,which is repressed in green-ripened fruit compared to yellow-ripened fruit,was identified as the potential binding protein for the MaNIP1 promoter.MaASR3 promoted chlorophyll degradation in banana fruit by repressing MaNIP1 expression.More importantly,the histone deacetylase MaHDT1 interacted with MaASR3 and enhanced MaASR3-mediated repression of MaNIP1.Overexpression of MaASR3 in banana fruit reduced the histone acetylation levels in the MaNIP1 promoter and repressed MaNIP1 expression,thereby weakening the HT-inhibited degreening of banana fruit.Our study reveals an innovative regulatory cascade comprising the MaASR3MaHDT1-MaNIP1 complex,which modulates HT-inhibited chlorophyll degradation.This explains the green ripening in bananas exposed to such conditions and enhances the comprehension of transcriptional and epigenetic regulations of fruit quality deterioration due to temperature stresses. 展开更多
关键词 high temperature inhibited chlorophyll breakdown banana fruit ripening green ripeningwhich yellow peelscausing e ubiquitin ligase histone deacetylase mahdt chlorophyll breakdown e ligase manip
暂未订购 下载PDF
Novel control method of vortex breakdown over delta wing using dual synthetic jets 认领 引用 被引量：1
5
作者 Hao WANG Zhenbing LUO +3 位作者 Xiong DENG Yan ZHOU Zhijie ZHAO Jianyuan ZHANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第5期52-64,共13页
To delay the vortex breakdown position of the slender delta wing,this study innovativelyproposes the application of control near the Leading-Edge Vortex(LEV)core sweeping path,whichis called Coupled Core Rotation Dual... To delay the vortex breakdown position of the slender delta wing,this study innovativelyproposes the application of control near the Leading-Edge Vortex(LEV)core sweeping path,whichis called Coupled Core Rotation Dual Synthetic Jets(CCR-DSJ)control.The results show that thevortex breakdown points at each angle of attack are moved backward after control,and the max-imum delayed displacement is 32.4%of the root chord at 30°.Besides,there is a linear relationshipbetween the breakdown position and the angle of attack after control,indicating that CCR-DSJcontrol has a significant effect on the pressure gradient of the vortex axis.Furthermore,the lift coef-ficient CLis enhanced after control,with a maximum CLincrement of 0.078 at 27°,and an effectiveincrement interval of[25°,32°].This interval is different from most previous studies,which isdirectly related to the position of the actuators.According to the lift change mechanism,the anglesof attack are divided into three stages:Stage 1(a=15°–25°),Stage 2(a=25°–32°),and Stage 3(a=32°–40°).In conclusion,CCR-DSJ control can significantly change the pressure distribution,thereby offering promising prospects for the flight stage of the slender delta wing. 展开更多
关键词 Vortex breakdown Delta wing Vortex core Core rotation Dual synthetic jets
暂未订购 下载PDF
3D mechanical modeling and analysis of influencing factors on fracture breakdown pressure in dual horizontal well intensive hydraulic fracturing 认领 引用 被引量：1
6
作者 Wan Cheng Zuncha Wang +3 位作者 Gang Lei Qinghai Hu Yuzhao Shi Siyu Yang 《Natural Gas Industry B》 2025年第1期1-15,共15页
Horizontal well intensive fracturing is a critical technology used to stimulate unconventional oil and gas reservoirs.Accurate prediction of wellbore breakdown pressure is conducive to optimal fracturing design and im... Horizontal well intensive fracturing is a critical technology used to stimulate unconventional oil and gas reservoirs.Accurate prediction of wellbore breakdown pressure is conducive to optimal fracturing design and improvement of the reservoir stimulation effect.In this work,the three-dimensional displacement discontinuity method(DDM)is used to characterize fracture deformation and fracture closure after the pumping pressure relief.The influences of key parameters such as the minimum horizontal principal stress,fracture spacing,the Young's modulus,the Poisson's ratio and pumping pressure on the breakdown pressure are analyzed.The results show that,assuming that the fracture half-length is a,the breakdown pressure outside the fracture surface area increases significantly within 2a in the direction of the minimum horizontal principal stress and a in the directions of the vertical stress and maximum horizontal principal stress before pressure relief.The breakdown pressure of the modified zipper-type fracturing in the later stage is lower.When the fracture spacing is small,the fracture breakdown pressure decreases after the modified zipper-type fracturing of two horizontal wells.The fracture breakdown pressure of the first fractured well reaches a maximum when the fracture spacing is a-1.5a,and the breakdown pressure decreases with increasing well spacing. 展开更多
关键词 Horizontal well Tight oil and gas Breakdown pressure Staged fracturing
暂未订购 下载PDF
Bio-based Epoxy Composites Demonstrating High Temperature Breakdown Strength and Thermal Conductivity for High Voltage Insulation 认领 引用
7
作者 Ke-Rong Yang Jin-Yue Dai +2 位作者 Shuai-Peng Wang Wei-Wei Zhao Xiao-Qing Liu 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2025年第1期40-52,I0006,共13页
The demand for energy-efficient and environmental-friendly power grid construction has made the exploitation of bio-based electrical epoxy resins with excellent properties increasingly important.This work developed th... The demand for energy-efficient and environmental-friendly power grid construction has made the exploitation of bio-based electrical epoxy resins with excellent properties increasingly important.This work developed the bio-based electrotechnical epoxy resins based on magnolol.High-performance epoxy resin(DGEMT)with a double crosslinked points and its composites(Al2O3/DGEMT)were obtained taking advantages of the two bifunctional groups(allyl and phenolic hydroxyl groups)of magnolol.Benefitting from the distinctive structure of DGEMT,the Al2O3/DGEMT composites exhibited the advantages of intrinsically high thermal conductivity,high insulation,and low dielectric loss.The AC breakdown strength and thermal conductivity of Al2O3/DGEMT composites were 35.5 kV/mm and 1.19 W·m-1·K-1,respectively,which were 15.6%and 52.6%higher than those of petroleum-based composites(Al2O3/DGEBA).And its dielectric loss tanδ=0.0046 was 20.7%lower than that of Al2O3/DGEBA.Furthermore,the mechanical,thermal and processing properties of Al2O3/DGEMT are fully comparable to those of Al2O3/DGEBA.This work confirms the feasibility of manufacturing environmentally friendly power equipment using bio-based epoxy resins,which has excellent engineering applications. 展开更多
关键词 Bio-based epoxy composites Magnolol Breakdown strength Thermal conductivity Dielectric loss
暂未订购 下载PDF
Aγ-irradiated AlGaN/GaN Schottky barrier diode with barrier-decreased Schottky junction and high breakdown voltage 认领 引用
8
作者 Jiahao Chen Tao Zhang +7 位作者 Ziqi Tao Kai Su Shengrui Xu Xiangdong Li Huake Su Yachao Zhang Yue Hao Jincheng Zhang 《Journal of Semiconductors》 EI CAS CSCD 2025年第12期79-85,共7页
In this letter,we demonstrate the effect ofγirradiation on the lateral AlGaN/GaN Schottky barrier diodes(SBDs)with self-terminated recessed anode structure and low work-function metal tungsten(W)as anode.For a compre... In this letter,we demonstrate the effect ofγirradiation on the lateral AlGaN/GaN Schottky barrier diodes(SBDs)with self-terminated recessed anode structure and low work-function metal tungsten(W)as anode.For a comprehensive evaluation of the radiation-resistance performance of the device,the total dose ofγirradiation is up to 100 kGy with irradiation time of 20 h.Attributed to the barrier lowering effect of the W/GaN interface induced byγirradiation observed in the experiment,the extracted turnon voltage(VON)defined at anode forward current of 1 mA decreases from 0.47 to 0.43 V.Meanwhile,benefiting from the reinforced Schottky interface treated by post-anode-annealing,a high breakdown voltage(BV)of 1.75 kV is obtained for theγ-irradiated AlGaN/GaN SBD,which shows the promising application for the deep-space radiation environment and promotes the development of radiation-resistance research for GaN SBDs. 展开更多
关键词 GaN SBDs γirradiation breakdown voltage radiation-resistance
暂未订购 下载PDF
Study on the induced mechanism and temporal characteristics of ion electric propulsion breakdown 认领 引用
9
作者 Hai GENG Chenchen WU +5 位作者 Yanhui JIA Weilong GUO Yaqiang HE Zitong WANG Yanxu PU Haibin TANG 《Plasma Science and Technology》 SCIE EI CSCD 2025年第6期78-86,共9页
Space ion electric propulsion has been widely used in the north-south position maintenance and orbit transfer missions for high-orbit satellites.However,unexpected electric breakdown by ion electric propulsion systems... Space ion electric propulsion has been widely used in the north-south position maintenance and orbit transfer missions for high-orbit satellites.However,unexpected electric breakdown by ion electric propulsion systems is still a challenging problem that needs to be solved,as it affects reliability.Based on the analysis of in-orbit and ground test data of ion thrusters from simulation and experimental results,the main influencing factors of induced electric breakdown are clarified and the mechanisms of induced electric breakdown are analyzed.It is found that the main factors inducing breakdown are the voltage and electric field strength between the grids.In addition,by monitoring the waveform of plasma discharge,the temporal characteristics of breakdown can be defined as three stages of“breakdown-spark-loop response”.Thus,three kinds of engineering suppression methods for breakdown of static vacuum with periodic short-term heating,electrode surface polishing and sealing insulation with plasma,add energy suppression circuit are carried out,and the experimental results show that the electric breakdown frequency can be reduced by about 30%. 展开更多
关键词 ion thruster electric breakdown discharge timing characteristics
暂未订购 下载PDF
Method to improve the classification accuracy by in situ laser cleaning of painted metal scraps during laser-induced breakdown spectroscopy based sorting 认领 引用 被引量：1
10
作者 Jaepil LEE Sungho SHIN +2 位作者 Inseok JANG Seongguk BAE Sungho JEONG 《Plasma Science and Technology》 SCIE EI CSCD 2025年第3期72-86,共15页
Scrap metals are typically covered with surface contaminants,such as paint,dust,and rust,which can significantly affect the emission spectrum during laser-induced breakdown spectroscopy(LIBS)based sorting.In this stud... Scrap metals are typically covered with surface contaminants,such as paint,dust,and rust,which can significantly affect the emission spectrum during laser-induced breakdown spectroscopy(LIBS)based sorting.In this study,the effects of paint layers on metal surfaces during LIBS classification were investigated.LIBS spectra were collected from metal surfaces painted with black and white paints by ablation with a nanosecond pulsed laser(wavelength=1064 nm,pulse width=7 ns).For the black-painted samples,the LIBS spectra showed a broad background emission,emission lines unrelated to the target metals,large shot-to-shot variation,and a relatively low signal intensity of the target metal,causing poor classification accuracy even at high shot numbers.Cleaning the black paint layer by ablating over a wide area prior to LIBS analysis resulted in high classification accuracy with fewer shot numbers.A method to determine the number of cleaning shots necessary to obtain high classification accuracy and high throughput is proposed on the basis of the change in LIBS signal intensity during cleaning shots.For the white-painted samples,the paint peeled off the metal surface after the first shot,and strong LIBS signals were measured after the following shot,which were attributed to the nanoparticles generated by the ablation of the paint,allowing an accurate classification after only two shots.The results demonstrate that different approaches must be employed depending on the paint color to achieve high classification accuracy with fewer shot numbers. 展开更多
关键词 laser induced breakdown spectroscopy(LIBS) scrap metal paint surface contaminant cleaning
暂未订购 下载PDF
Numerical simulation of vortex breakdown in a cylindrical tank with rotating bottom and free surface using level set method 认领 引用
11
作者 Zepeng Zhao Qin Li +5 位作者 Feng Ye Haoliang Wang Jianfeng Wang Hui Yu Xiangyang Li Chao Yang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第1期293-300,共8页
A cylindrical chamber with a rotating bottom holds significant potential for application in cell culture bioreactors due to its ability to generate more stable swirling flows.In order to control vortex breakdown withi... A cylindrical chamber with a rotating bottom holds significant potential for application in cell culture bioreactors due to its ability to generate more stable swirling flows.In order to control vortex breakdown within the chamber,this study first establishes a computational fluid dynamics simulation coupled with the level set method.Verified by experimental results in literature,this method accurately simulates the position and shape of vortex breakdown,and also predicts the critical Reynolds numbers for the appearance and detachment of vortex breakdown bubbles from the center.Additionally,it precisely captures the gas-liquid interface and depicts the vortex breakdown phenomenon in the air above the liquid for the first time.Finally,it predicts the impact of physical property of gas-liquid systems on vortex breakdown in response to significant changes in viscosity of microbial process systems. 展开更多
关键词 Vortex breakdown Level set Microbial cultivation Micro-bioreactor
暂未订购 下载PDF
A review on breakdown pressure in hydraulic fracturing of subsurface geologic formations:Influencing factors,reduction strategies and research gaps 认领 引用
12
作者 Fahad Khan Mohamed Mahmoud +4 位作者 Arshad Raza Murtadha J.Al Tammar Shirish Patil Talal Al Shafloot Misfer J.Al Marri 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第12期8224-8240,共17页
Hydraulic fracturing is a commonly used stimulation technique for production optimization in various geological formations such as tight sandstone,shale,coal bed methane,and heat extraction in geothermal reservoirs.Br... Hydraulic fracturing is a commonly used stimulation technique for production optimization in various geological formations such as tight sandstone,shale,coal bed methane,and heat extraction in geothermal reservoirs.Breakdown pressure is a vital component in hydraulic fracture job design,which is affected by various parameters including rock strength and depth.Various methods including modelling and experimental approaches exist to quantify the breakdown pressure.There have been many strategies to reduce this pressure for efficient and economical hydraulic fracture jobs,especially when this pressure exceeds pump capacity.This study provides a detailed review of breakdown pressure in terms of fundamentals,influencing factors,and estimation approaches.In addition,different strategies are also presented to reduce the breakdown pressure along with cost analysis.Lastly,research gaps pertinent to this area are highlighted for emphasis in future research.Specifically,it has been found that high breakdown pressure is associated with challenges,but there are no comprehensive techniques and strategies to lower this pressure in formations with very high in situ stress profiles or complicated tectonic settings.Developing such methods is important to minimize operational failures,lower costs and reduce the environmental risks during reservoir exploitation.This study reviews the fundamentals,influencing factors,and estimation methods of breakdown pressure and provides a deep understanding of the strategies for its reduction.The study also presents the cost analyses,and highlights research gaps for future investigation. 展开更多
关键词 Breakdown pressure Geothermal reservoir Unconventional reservoir Strategies Cost analysis
暂未订购 下载PDF
Anodic behaviour of Mg at pre-breakdown stages of PEO in basic electrolytes 认领 引用
13
作者 Yuchen Lu Aleksey Rogov +1 位作者 Sepideh Aliasghari Aleksey Yerokhin 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第8期3596-3616,共21页
Electrolyte selection for Plasma Electrolytic Oxidation(PEO)of magnesium is important as this determines composition,morphology and properties of resultant coatings that are urgently sought after for protection of Mg ... Electrolyte selection for Plasma Electrolytic Oxidation(PEO)of magnesium is important as this determines composition,morphology and properties of resultant coatings that are urgently sought after for protection of Mg alloys from corrosion and wear in harsh environments.However,electrolyte design is often performed heuristically,which hampers the development and optimisation of new PEO processes.Here,we attempt to achieve a mechanistic understanding of electrochemical and microstructural aspects of anodic films evolution at the prebreakdown stages of PEO treatments of magnesium in aqueous alkaline solutions of NaAlO2,Na3PO4,Na F and Na2SiO3.Systematic studies have shown that magnesium self-passivation by MgO/Mg(OH)2can be compromised by both chemical and mechanical instabilities developed due to side effects of anodic reactions.Stable initiation of PEO process requires maintaining surface passivity in a wide range of p H,which can be achieved only by combining self-depositing passivators with those binding dissolved magnesium into insoluble compounds. 展开更多
关键词 Magnesium Plasma electrolytic oxidation High-voltage voltammetry Passivity breakdown
暂未订购 下载PDF
Detection of trace metals in water by filamentand plasma-grating-induced breakdown spectroscopy 认领 引用 被引量：3
14
作者 Mengyun Hu Fangfang Li +4 位作者 Shencheng Shi Yu Qiao Jinman Ge Xiaojun Li Heping Zeng 《Advanced Photonics Nexus》 2023年第1期70-79,共10页
Filament-and plasma-grating-induced breakdown spectroscopy(F-GIBS)was demonstrated as an efficient technique for sensitive detection of metals in water,where plasma gratings were established through synchronized nonli... Filament-and plasma-grating-induced breakdown spectroscopy(F-GIBS)was demonstrated as an efficient technique for sensitive detection of metals in water,where plasma gratings were established through synchronized nonlinear interaction of two noncollinear filaments and an additional filament was generated with another fs laser beam propagating along their bisector.A water jet was constructed vertically to the three coplanar filaments,overcoming side effects from violent plasma explosion and bubble generation.Three distinct regimes of different mechanisms were validated for nonlinear couplings of the third filament with plasma gratings.As the third filament was temporally overlapped with the two noncollinear filaments in the interaction zone,all the three filaments participated in synchronous nonlinear interaction and plasma grating structures were altered by the addition of the third filament.As the third filament was positively or negatively delayed,the as-formed plasma gratings were elongated by the delayed third filament,or plasma gratings were formed in the presence of plasma expansion of the ahead third filament,respectively.Using F-GIBS for trace metal detection in water,significant spectral line enhancements were observed. 展开更多
关键词 laser-induced breakdown spectroscopy filament and plasma-gratings induced breakdown spectroscopy filaments plasma gratings grating induced breakdown spectroscopy
暂未订购 下载PDF
Numerical study on lightning strike protection method for composite rotor blade based on air breakdown and insulating adhesive layer 认领 引用
15
作者 Kenan LI Xiaoquan CHENG +1 位作者 Ziqian AN Wenjun HUANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第2期185-199,共15页
The protection effectiveness of traditional Lightning Strike Protection(LSP)for composite rotor blade of helicopter can be diminished due to the explosion risk in overlapping attachment under lightning strike,so a new... The protection effectiveness of traditional Lightning Strike Protection(LSP)for composite rotor blade of helicopter can be diminished due to the explosion risk in overlapping attachment under lightning strike,so a new protection method based on Air Breakdown and insulating adhesive layer(AB-LSP method)was designed to avoid it.In this study,a numerical method was developed to simulate the electrical breakdown,and verified by experiment results.Based on this method,a Finite Element Model(FEM)was established to investigate the effect of two factors(breakdown strength and initial ablation temperature of adhesive layer)on the LSP effectiveness.The results show that the breakdown strength impacts more to the ablation damage in composite than that of high-temperature resistance.Then,another FEM was established to predict the ablation damage by lightning strike in the AB-LSP method protected composite rotor blade.The mechanisms and potential key parameters(magnitude of lightning current,discharge channel location,adhesive layer thickness,and air gap width)that could affect the protection effectiveness were analyzed.The introduction of air breakdown changes the current conduction path and reduces explosion risk.After rational design,this method can offer effective lightning protection for composite helicopter rotor blade and other composite structures. 展开更多
关键词 Helicopter rotors Composite structures Air breakdown Insulating adhesive Lightning protection Finite element method
暂未订购 下载PDF
交通流Breakdown现象与交通扰动演化模型 认领 引用 被引量：10
16
作者 郝媛 孙立军 徐天东 《同济大学学报（自然科学版）》 EI CAS 北大核心 2009年第9期1178-1184,共7页
建立了用以间接证明交通流自发breakdown现象的交通扰动演化模型.基于跟车思想制定了"继承"和"改变"两种车辆行驶规则;基于交通波动理论刻画了车辆经历扰动的减速波和加速波,并结合到达车流的车头时距分布,建立了... 建立了用以间接证明交通流自发breakdown现象的交通扰动演化模型.基于跟车思想制定了"继承"和"改变"两种车辆行驶规则;基于交通波动理论刻画了车辆经历扰动的减速波和加速波,并结合到达车流的车头时距分布,建立了扰动演化模型.模型考虑了"迟滞"现象和"二次扰动"现象,采用蒙特卡罗方法进行数值模拟,对比了五种形式的breakdown概率,分析了模型中重要参数对计算结果的影响及原因. 展开更多
关键词 交通流breakdown 交通扰动 breakdown概率 跟车行为 交通波动理论
暂未订购 下载PDF
An AlGaN/GaN HEMT with enhanced breakdown and a near-zero breakdown voltage temperature coefficient 认领 引用 被引量：4
17
作者 谢刚 汤岑 +4 位作者 汪涛 郭清 张波 盛况 Wai Tung Ng 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第2期361-365,共5页
An AlGaN/GaN high-electron mobility transistor（HEMT） with a novel source-connected air-bridge field plate（AFP） is experimentally verified.The device features a metal field plate that jumps from the source over the... An AlGaN/GaN high-electron mobility transistor（HEMT） with a novel source-connected air-bridge field plate（AFP） is experimentally verified.The device features a metal field plate that jumps from the source over the gate region and lands between the gate and drain.When compared to a similar size HEMT device with a conventional field plate（CFP） structure,the AFP not only minimizes the parasitic gate to source capacitance,but also exhibits higher OFF-state breakdown voltage and one order of magnitude lower drain leakage current.In a device with a gate to drain distance of 6 μm and a gate length of 0.8 μm,three times higher forward blocking voltage of 375 V was obtained at VGS =-5 V.In contrast,a similar sized HEMT with a CFP can only achieve a breakdown voltage no higher than 125 V using this process,regardless of device dimensions.Moreover,a temperature coefficient of 0 V/K for the breakdown voltage is observed.However,devices without a field plate（no FP） and with an optimized conventional field plate（CFP） exhibit breakdown voltage temperature coefficients of-0.113 V/K and-0.065 V/K,respectively. 展开更多
关键词 AlGaN/GaN high-electron mobility transistor air-bridge field plate breakdown voltage breakdown voltage temperature coefficient
暂未订购 下载PDF
Numerical Study on Atmospheric Pressure DBD in Helium:Single-breakdown and Multi-breakdown Discharges 认领 引用 被引量：2
18
作者 王小华 杨爱军 +1 位作者 荣命哲 刘定新 《Plasma Science and Technology》 SCIE EI CAS CSCD 2011年第6期724-729,共6页
A 1-D fluid model for homogeneous dielectric barrier discharge （DBD） in helium is presented, aimed at unraveling the spatial-temporal characteristics of two basic discharge regimes： single-breakdown and multi-break... A 1-D fluid model for homogeneous dielectric barrier discharge （DBD） in helium is presented, aimed at unraveling the spatial-temporal characteristics of two basic discharge regimes： single-breakdown and multi-breakdown discharges. Discharge currents, gap voltages, charge densities, electron temperature and electric field profiles of the two regimes make it clear that these two regimes are qualitatively different. It is found that the multi-breakdown discharge has a more homogeneous flux on dielectrics compared to the single-breakdown discharge. 展开更多
关键词 fluid model single-breakdown discharge multi-breakdown discharge dielectric barrier discharge
暂未订购 下载PDF
Effects of the critical breakdown path on the ignition performance in heaterless hollow cathodes 认领 引用 被引量：1
19
作者 Bo YU Yanda LEE +1 位作者 Xiaolu KANG Qing ZHAO 《Plasma Science and Technology》 SCIE EI CAS CSCD 2020年第6期164-179,共16页
The critical breakdown path(CBP)has a significant impact on the breakdown voltage curve and the ignition time of heaterless hollow cathodes(HHCs).To determine the pattern of the variation in the CBP position and its i... The critical breakdown path(CBP)has a significant impact on the breakdown voltage curve and the ignition time of heaterless hollow cathodes(HHCs).To determine the pattern of the variation in the CBP position and its impact on ignition performance,a numerical model named the CBP evaluation(CBPE)was established in this paper to calculate the CBP of a HHC.The CBPE model can be used to screen various potential breakdown paths to identify those that are most likely to satisfy the Townsend breakdown conditions,which are denoted as CBPs.To verify the calculation accuracy of the CBPE model,4.5 A-level HHC ignition tests were conducted on HHCs with three different structures.By comparing the test results and the calculated results of the breakdown voltage,the calculation errors of the CBPE under three HHC conditions ranged from 1.6%to 5.8%,and the trends of the calculated results were consistent with those of the test results.The ignition test also showed the characteristics of the breakdown voltage curve and the ignition time for the three HHCs.Based on the CBPE model,an in-depth analysis was conducted on the mechanism of the patterns revealed by the tests.The main conclusions are presented as follows:(1)the CBP always shifts from the long path to the short path in the HHCs with an increasing gas flow rate;and(2)the ignition time of the HHCs depends on the position of the CBP because different CBP positions can cause different mechanisms of heat transfer from the plasma to the emitter.This study can guide the optimization of the CBP position and the corresponding ignition times of HHCs. 展开更多
关键词 breakdown path heaterless hollow cathode breakdown voltage ignition time numerical calculation
暂未订购 下载PDF
Applying Improved Electrical Breakdown Model to Study Insulating Property of c-C_4F_8/N_2 Gas Mixture 认领 引用
20
作者 LI Xue-wen XIAO Deng-ming 《高压电器》 CAS CSCD 北大核心 2011年第9期19-25,共7页
Perfluorocyclobutane(c-C4F8) has been recently considered as a potential alternative to SF6,because of its high electro-negativity and extremely low environmental effect.However,due to its high boiling point,c-C4F8 sh... Perfluorocyclobutane(c-C4F8) has been recently considered as a potential alternative to SF6,because of its high electro-negativity and extremely low environmental effect.However,due to its high boiling point,c-C4F8 should mixed with buffer gases such as N2 or CO2 in order to avoid the liquefaction at low temperature.This paper investigates insulating properties of c-C4F8/N2 gas mixtures from two aspects including electrical strength,and Global Warming Potential(GWP).Moreover,improved electrical breakdown model of gas mixtures is founded.Breakdown temperature and breakdown electrical field in gas mixtures can be obtained from rigorous Townsend criterion expression according to gas mixtures ratio and cross section data of gas mixtures in this model.Under the condition of different gas pressure(0.1~0.4 MPa),gas mixtures ratio(0～30%),and electrode gap(2~10 mm),breakdown voltages of gas mixtures are calculated by using of this model.Insulation strength of SF6/N2 mixed gas is compared with c-C4F8/N2 mixed gas in the same conditions.Research results show that theoretical computation corresponds with experiment.If the content of c-C4F8 or SF6 in mixtures is less than 30%,insulation strength between c-C4F8/N2 and SF6/N2 is very close.Considering two indexes(breakdown voltage,GWP),it is suitable for c-C4F8 content being 15%～20% in c-C4F8/N2 gas 展开更多
关键词 electrical breakdown model breakdown temperature gas mixture ratio
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 250 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈