检索结果-内蒙古大学图书馆

Generation of microdischarge plasma in a pore: Effect of the pulse voltage parameters

JOURNAL OF ELECTROSTATICS 2025年 135卷

作者： Yang, Zitong Shang, Kefeng Fu, Mengji Lu, Na Jiang, Nan Li, Jie Dalian Univ Technol Sch Elect Engn Dalian 116024 Peoples R China

Porous catalysts have important applications in plasma catalysis processes for nitrogen fixation, chemical synthesis, environmental pollutant treatment, and others. Understanding the generation mechanism of microdischarge in the pores is crucial for designing the catalysts suitable for plasma catalysis processes. In this paper, a two-dimensional fluid model was established to simulate the microdischarge characteristics in a pore at atmospheric pressure, mainly focusing on the effect of pulse voltage parameters, including voltage amplitude, pulse rise time, pulse width and pulse polarity. The results show that the pulse polarity significantly affects the production of microdischarge. Compared with negative pulse voltage, applying positive pulse voltage on the dielectric results in higher gas ionization rate and total ion density, and electron density as well as electron temperature are higher, which can promote the formation of microdischarge in the pore. In addition, high pulse voltage amplitude is more likely to produce microdischarge in a pore, while the pulse rising edge time and pulse width mainly affect electron density and electron energy. With the rise time increasing, the electron density increases significantly, and the electron temperature rises slightly. Moreover, the shorter the pulse width, the higher the electron temperature and electron energy. Higher pulse voltage, shorter pulse rise time and narrower pulse width can result in stronger electric field in and near the pore, benefiting the generation of microdischarge in a pore.

关键词： Dielectric barrier discharge Porous material Microdischarge pulse parameters pulse polarity

来源：评论

学校读者我要写书评

暂无评论

Surface morphology and crystal orientation of electrodeposited tungsten coatings with different pulse parameters

引用

Rare Metals 2018年第5期37卷 407-412页

作者： Xian-Qin Fang Ying Zhang Kai-Gui Zhu Wen-Jia Han Jian-Gang Yu Zhe Chen Hui-Jun Shi Beijing Key Laboratory of Advanced Nuclear Energy Materials and Physics School of Physics and Nuclear Energy EngineeringBeihang University

This study was conducted to investigate the influence of pulse parameters on the surface morphology and crystal orientation of the tungsten coatings electrodeposited on pure copper substrates. The deposited coatings were analyzed by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and energy-dispersive spectrometer （EDS）. SEM analysis indicates that pulse parameters have significant influences on the surface morphology of the deposited coatings. Meanwhile, the change in grain size of the tungsten coatings demonstrates that the change in frequency and duty cycle could cause the variation of nucleation rate and grain growth of deposits. Moreover, no obvious diffusion layer at the coating/substrate interface is found by line analysis of EDS. XRD results reveal that tungsten coatings are of bcc structure and the preferred orientation of the deposits varies with duty cycle and period.

关键词： Tungsten coating Electrodeposition pulse parameters Crystal orientation Surface morphology

来源：评论

学校读者我要写书评

暂无评论

EFFECTS OF SOME DIFFERENT pulse parameters ON BLADDER INHIBITION AND URETHRAL CLOSURE DURING INTRAVAGINAL ELECTRICAL-STIMULATION - AN EXPERIMENTAL-STUDY IN THE CAT

引用

MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING 1986年第1期24卷 27-33页

作者： OHLSSON, B LINDSTROM, S ERLANDSON, BE FALL, M GOTHENBURG UNIV DEPT PHYSIOL S-41124 GOTHENBURG SWEDEN GOTHENBURG UNIV DEPT UROL S-41124 GOTHENBURG SWEDEN

Intravaginal electrical stimulation (IVS) was used in the cat to induce bladder inhibition and urethral closure. The purpose of the study was to compare the efficacy of alternating constant-voltage pulses of different durations (0.1, 0.2, 0.5 and 5 ms) with that of chopped alternating pulses each consisting of a train of five 0.5 ms pulses with 0.5 ms pauses between. The voltage requirement for an equal biological effect was lowest for the 5 ms alternating pulse, whereas the pulse power dissipation was lowest for the 0.1 ms pulse, about 10 per cent of that for the 5 ms pulse. If both voltage requirement and power dissipation are taken into account, the 0.5 ms pulse was considered the most appropriate compromise. The chopped pulse was the least efficient stimulus, since the threshold voltage was comparable to that of the 0.5 ms duration alternating pulse, implying a five times higher power dissipation. For bladder inhibition, the optimal stimulation frequency for alternating pulses was 10 Hz, both in terms of threshold voltage and power consumption. For urethral closure the voltage requirement was lowest at 50 Hz was preferable in terms of power dissipation for an equal, although submaximal, effect.

关键词： Bladder inhibition Incontinence Intravaginal electrical stimulation pulse parameters Urethral closure

来源：评论

学校读者我要写书评

暂无评论

Influence of Supply Voltage Frequency and Magnitude on PD pulse parameters

引用

IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 2008年第6期15卷 1590-1600页

作者： Nyamupangedengu, Cuthbert Jandrell, Ian R. Univ Witwatersrand Sch Elect & Informat Engn ZA-2050 Johannesburg South Africa

A study on the influence of supply voltage magnitude and frequency on partial discharge (PD) pulse shapes is presented in this paper. Ultrawide band (UWB) time-resolved PD pulse measurements were carried out on artificial PD defects using test voltage frequency range of 10 - 400 Hz and voltage range of 2 - 11 kV. The manner in which the PD pulse shape responded to changes in the test voltage characteristics depended on the defect type. The observations can be interpreted using the generally agreed theory of PD mechanisms. The knowledge generated in this work is valuable in the interpretation and comparison of PD measurements made at different voltages and frequencies. It also contributes to development of PD defect classification techniques based on the correlation between test voltage frequency and time-resolved PD.

关键词： Partial discharges pulse parameters supply voltage magnitude and frequency

来源：评论

学校读者我要写书评

暂无评论

Characteristics of Trichel pulse parameters in Negative Corona Discharge

引用

IEEE TRANSACTIONS ON PLASMA SCIENCE 2017年第8期45卷 2191-2201页

作者： Lu, Binxian Sun, Hongyu Wu, Qiukun North China Elect Power Univ State Key Lab Alternate Elect Power Syst Renewabl Beijing 102206 Peoples R China North China Elect Power Univ Beijing Key Lab High Voltage & EMC Beijing 102206 Peoples R China

In order to investigate the characteristics of Trichel pulse in negative corona discharge, a corona discharge measurement system, and a simulation model are proposed. pulse parameters fit by double exponential function are discussed in this paper. Effects of the magnitude, interval, crest time, and fall time of the pulse on the parameters are discussed for different applied voltages and radii of curvature of the needle electrode. Fitting functions under different conditions are also given in this paper.

关键词： Exponential fitting negative corona discharge pulse parameters

来源：评论

学校读者我要写书评

暂无评论

Effect of pulse parameters on Deposition in Concrete Crack using pulse Current Electro-deposition

引用

Journal of Wuhan University of Technology(Materials Science) 2018年第4期33卷 908-914页

作者：储洪强 WANG Tingting JIANG Linhua XU Yi SONG Zijian XU Ning ZHAO Sujing College of Mechanics and Materials Hohai University Nanjing Hydraulic Research Institute

To evaluate the effect of pulse parameters on the formation of electrodeposits in concrete cracks, five different types of pulse current were set up, and ZnSO_4 and MgSO_4 solutions were used as the electrolytes. The rate of weight gain, rate of surface coating, rate of crack closure and crack filling depth were measured. Scanning electron microscopy was used to assess the morphology of the electrodeposits, and energy dispersive spectroscopy was used to analyze the mineral composition of the electrodeposits in the cracks. The experimental results demonstrate that, among five different pulse parameters, when T_（on）/T_（off）=0.8 ms/0.8 ms, the healing effect of electro-deposition is the best. The pulse mode hardly affects the mineral composition of the electrodeposits but changes the micromorphology. In addition, for both ZnSO_4 and MgSO_4 solutions, when T_（on）/T_（off）=0.8 ms/0.8 ms, the crystal structure of the electrodeposits is the most uniform and the densest.

关键词： pulse electro-deposition repair of concrete cracks pulse parameters healing effect

来源：评论

学校读者我要写书评

暂无评论

A Study of the Effects Laser pulse parameters Have on the Laser-induced Electrochemical Etching of Silicon

引用

LASERS IN ENGINEERING 2013年第5-6期26卷 285-293页

作者： Long, Y-H. Liao, Y-J. Li, X-M. Yu, J-W. Xiong, L-C. Shi, T-L. Guilin Univ Elect Technol Sch Mech & Elect Engn Guilin 541004 Peoples R China Hunan Vocat Coll Railway Technol Dept Mech Engn Zhuzhou 412000 Peoples R China Huazhong Univ Sci & Technol Sch Mech Sci & Engn Wuhan 430074 Peoples R China

Laser electrochemical etching process, which combines laser direct etching process and electrochemical etching process, is a compound etching technique. Because of the laser-induced effect, the etching process only occurs in the laser-irradiating zone and so this process can transfer pattern without mask. The experiments of micromachining silicon by laser-induced electrochemical etching were carried out. This paper adopted a 248 nm excimer laser as the light source and used KOH solution as electrolyte. Based on the experimental results, the effect of laser pulse parameters on surface morphology and etching rate in laser electrochemical etching were researched, the curves of etch rate varying with pulse parameters were given, and the reasons of etching results were analysed in detail. Therefore, laser pulse number is an effective way to control the etching depth.

关键词： Excimer laser pulse parameters electrochemical etching KOH etch depth silicon

来源：评论

学校读者我要写书评

暂无评论

The effect of histogram size on histogram-derived pulse parameters

引用

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 1998年第3期47卷 609-612页

作者： Paulter, NG Natl Inst Stand & Technol Gaithersburg MD 20899 USA

The effects of the number of histogram bins on histogram-derived pulse parameters of step-like waveforms is examined. An empirical method for selecting the optimal number of bins is described.

关键词： calibration histogram pulse parameters reference standards step-like waveforms waveform recorders

来源：评论

学校读者我要写书评

暂无评论

QUANTITATIVE DEPENDENCE OF ELECTROPORATION ON THE pulse parameters

引用

BIOELECTROCHEMISTRY AND BIOENERGETICS 1995年第2期37卷 101-107页

作者： TOMOV, TC Institute of Biophysics Bulgarian Academy of Science G. Bonchev str. bl. 21 Sofia-1113 Bulgaria

The porating action of exponential and rectangular electric pulses was studied. The quantitative dependence of the percentage of porated cells on the amplitude and duration of the pulse was derived, assuming that the probability of poration depends linearly on the transmembrane potential square. In (N-o/N)/T (where N/N-o is the part of the nonporated cells after the pulse and T is the pulse duration) was found to depend on the amplitude and not on the duration of the pulse. The dependences derived were compared with experimental results on the electroporation of human erythrocytes.

关键词： ELECTROPORATION pulse parameters HUMAN ERYTHROCYTES

来源：评论

学校读者我要写书评

暂无评论

Dynamics of Cell Death Due to Electroporation Using Different pulse parameters as Revealed by Different Viability Assays

引用

ANNALS OF BIOMEDICAL ENGINEERING 2024年第1期52卷 22-35页

作者： Peng, Wencheng Polajzer, Tamara Yao, Chenguo Miklavcic, Damijan Chongqing Univ Dept Elect Engn State Key Lab Power Transmiss Equipment & Syst Sec Chongqing 400044 Peoples R China Univ Ljubljana Fac Elect Engn Trzaska 25 Ljubljana 1000 Slovenia

The mechanisms of cell death due to electroporation are still not well understood. Recent studies suggest that cell death due to electroporation is not an immediate all-or-nothing response but rather a dynamic process that occurs over a prolonged period of time. To investigate whether the dynamics of cell death depends on the pulse parameters or cell lines, we exposed different cell lines to different pulses [monopolar millisecond, microsecond, nanosecond, and high-frequency bipolar (HFIRE)] and then assessed viability at different times using different viability assays. The dynamics of cell death was observed by changes in metabolic activity and membrane integrity. In addition, regardless of pulse or cell line, the dynamics of cell death was observed only at high electroporation intensities, i.e., high pulse amplitudes and/or pulse number. Considering the dynamics of cell death, the clonogenic assay should remain the preferred viability assay for assessing viability after electroporation.

关键词： Electroporation pulsed field ablation Cell death dynamics pulse parameters Viability assays

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：