检索结果-南通市图书馆

High Voltage 2023年第3期8卷 527-537页

作者： Dmitry Beloplotov victor tarasenko Dmitry Sorokin Cheng Zhang Tao Shao Institute of.High Current Electronics Siberian Branch of the Russian Academy of ScienceTomskRussia Beijing International S&T Cooperation Base f.r Plasma Science and Energy Conversion Institute of Electrical EngineeringChinese Academy of SciencesBeijingChina

The development of.positive and negative streamers in a point-to-plane gap f.lled with air and nitrogen at various pressures(50-200 kPa)and voltages(8-25 kV)was studied.A f.ur-channel intensif.ed charge-coupled device(ICCD)and a streak-camera were *** parameters were measured with high resolution(10 GHz).An original method of.measuring a displacement current caused by a streamer was *** was expected,positive streamer branches in nitrogen at low voltages and/or elevated pressures while a large-diameter streamer is f.rmed in ***,at high voltages or negative polarity,the large-diameter streamer is f.rmed both in nitrogen and air in the entire pressure *** was f.und that runaway electrons(REs)are generated in the very f.rst picoseconds of.gas ionisation near the pointed *** was assumed that REs can be generated near the pointed anode and produce bremsstrahlung radiation due to a sharply inhomogeneous distribution of.electrical *** was f.und that in the f.nal stage of.negative streamer development in air and nitrogen,the gas between the streamer f.ont and the opposite electrode is ionised almost simultaneously in the entire volume when the streamer diameter is almost equal to the interelectrode gap.

关键词： sharply inhomogeneous electrode

Subnanosecond high-voltage breakdown initiated in high-pressure nitrogen by a runaway electron beam

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Voltage 2017年第2期2卷 56-59页

作者： Alexander G.Burachenko victor f.tarasenko Evgenii Kh.Baksht Institute of.High Current Electronics SB RAS Tomsk 634055Russia National Research Tomsk State University Tomsk 634050Russia National Research Tomsk Polytechnic University Tomsk 634050Russia

This study reports on subnanosecond breakdowns initiated on high pressure nitrogen by a runaway electron beam in an inhomogeneous electric *** is shown that a dif.use discharge with a duration of.1 ns is f.rmed in the gas *** are reported f.r the f.rst time on collector measurements of.a supershort avalanche electron beam downstream of.an anode f.il at a nitrogen pressure of.0.5–1.2 *** beam pulsewidth at these pressures is∼90 *** a nitrogen pressure of.1.2 MPa,the number of.electrons with an energy>70 keV recorded by the collector is 4×10^(6)/cm^(2).

关键词： f.eld initiated beam

Runaway electrons during subnanosecond breakdowns in high-pressure gases

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Voltage 2016年第4期1卷 181-191页

作者： victor f.tarasenko Mikhail I.Lomaev Dmitry V.Beloplotov Dmitry A.Sorokin Institute of.High Current Electronics Siberian Branch Russian Academy of Science2/3 Akademicheskii Ave.Tomsk 634055Russia

The parameters of.runaway electrons produced in nanosecond high-voltage discharges in dif.erent gases(air,nitrogen,sulphur hexaf.uoride,krypton,argon,methane,neon,hydrogen,helium)at atmospheric and higher pressure were *** optical analysis was also perf.rmed to investigate the ionisation dynamics in dif.use discharges in nitrogen and nitrogen-containing *** breakdown of.a point-to-plane gap by nanosecond(≃2 ns)high-voltage(≃200 kV)pulses of.negative voltage polarity and gas pressure above 0.1 MPa,a supershort avalanche electron beam(SAEB)was detected by a collector behind the f.at *** pressure>0.1 MPa of.nitrogen and other gases it is shown that the maximum pressure f.r SAEB registration decreases with increasing the voltage pulse rise ***,to detect a SAEB at atmospheric and higher gas pressure,one should use voltage pulses with an amplitude of.hundred kilovolts and rise time of.1 ns and *** experimental research in the dynamics of.optical radiation f.om the discharge plasma shows that the breakdown in which runaway electrons are produced develops as an ionisation wave.

关键词： wave. gases f.uoride

大气压空气纳秒脉冲板-板放电中逃逸电子产生机理

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

物理学报 2023年第10期72卷 233-241页

作者：肖江平戴栋 victor f.tarasenko 邵涛华南理工大学电力学院广州510641 俄罗斯科学院大电流研究所俄罗斯托木斯克634055 中国科学院电工研究所北京100190

经典放电理论(Townsend和流注理论)解释纳秒脉冲气体放电存在局限性,近年来基于高能电子逃逸的纳秒脉冲气体放电理论研究受到广泛关注.但是目前对大气压空气纳秒脉冲板-板放电中逃逸电子产生机理研究仍较少,严重阻碍了纳秒脉冲放电等离... 详细信息

经典放电理论(Townsend和流注理论)解释纳秒脉冲气体放电存在局限性,近年来基于高能电子逃逸的纳秒脉冲气体放电理论研究受到广泛关注.但是目前对大气压空气纳秒脉冲板-板放电中逃逸电子产生机理研究仍较少,严重阻碍了纳秒脉冲放电等离子体的应用发展.本文利用一维粒子模型,对幅值为20 kV的纳秒脉冲电压驱动下,间隙长为1 mm的板-板电极之间的大气压空气放电中逃逸电子的产生机理进行了数值模拟研究..结果表明,在空间电荷动力学行为的影响下,板-板电极之间出现了增强电场区域,使得电子可以满足电子逃逸判据而进入逃逸模式.此外,还观察到放电通道前逃逸电子的预电离效应导致了二次电子崩的产生,随着二次电子崩与放电通道不断汇聚,引导并加速了放电通道的发展,最终导致气隙击穿.本研究进一步揭示了纳秒脉冲板-板放电机理,拓展了纳秒脉冲气体放电基础理论,为纳秒脉冲放电等离子体的应用和发展开辟了新的机会.

关键词：纳秒脉冲放电逃逸电子增强电场预电离

f.rmation of.Dif.use and Spark Discharges in Nonunif.rm Electric f.eld in Elevated Pressure Gases

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

高电压技术 2013年第9期39卷 2105-2111页

作者： V. f. tarasenko E. Kh. Baksht A. G. Burachenko M. V. Erof.ev Institute of.High Current Electronics Russian Academy of Sciences Siberian Branch 634055 Tomsk Russia

Dif.use and spark discharges are f.rmed and studied during breakdowns with nonunif.rm electric f.eld in nitrogen,air,and argon at elevated pressures and pulse repetition f.equency of.400 ***-polarity voltage pulses of.the amplitude 20 kV,width at the base of.15 ns and rise time of.2 ns are applied to the electrode with a small radius of.*** the conditions of.generation of.runaway electron beams and X-rays,a CCD camera records the time of.the dif.use discharge f.rmation and its duration prior to its transition to a spark *** all three gases,the dif.use discharge is f.rmed during the time not exceeding 1 ns,when the bright spots appear on cathode in argon and air resulting in the beginning of.the spark channel propagation.

关键词：火花放电不均匀电场高压气体脉冲重复频率上升时间 CCD照相机电压脉冲曲率半径

Dif.use discharges in Sf.(6)and mixtures of.Sf.(6)with H_(2),f.rmed by nanosecond voltage pulses in non-unif.rm electric f.eld

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

High Voltage 2018年第4期3卷 316-322页

作者： Alexei N.Panchenko victor f.tarasenko Dmitry V.Beloplotov Nikolay A.Panchenko Mikhail I.Lomaev Institute of.High Current Electronics Siberian Branch(SB)Russian Academy of Sciences(RAS)Tomsk 634055Russia f.culty of.Innovative Technologies National Research Tomsk State UniversityTomsk 634050Russia Department of.Photonics and Quantum Electronics National Research Tomsk Polytechnic UniversityTomsk 634050Russia Department of.Physics Tomsk State University of Control Systems and RadioelectronicsTomsk 634050Russia

Results of.experimental study of.nanosecond dif.use discharge in Sf.(6)and gas mixtures of.Sf.(6)with H_(2),D_(2)and C_(2)H_(6)are *** aim of.this work is to study parameters of.discharge between two extended electrodes with a small radius of.curvature in Sf.(6)and Sf.(6)with *** was shown that dif.use discharge can be f.rmed in Sf.(6)at elevated pressure between blade electrodes with length of.30 *** was also conf.rmed that in a sharply non-unif.rm electric f.eld a beam of.runaway electrons is generated and that the gap breakdown occurs due to ionisation waves which begin on electrodes with small radius of.*** action in the inf.ared spectral region was obtained in Sf.(6)-H_(2)(D_(2),C_(2)H_(6))*** laser output up to 110 mJ was easily achieved which corresponds to ultimate intrinsic ef.iciency(with respect to deposited energy)of.10%.

关键词： breakdown unif.rm radius

Neutrons in a nanosecond low-pressure discharge in deuterium

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2016年第4期1卷 207-212页

作者： victor f.tarasenko Mikhail I.Lomaev Dmitry A.Sorokin Boris A.Nechaev Vladimir N.Padalko Gennady N.Dudkin Laboratory of.Optical Radiation of.the Institute of.High Current Electronics SB RAS Tomsk 634055Russia Physical Technical Institute National Research Tomsk Polytechnic UniversityTomsk 634050Russia National Research Tomsk State University Tomsk 634050Russia

Stable neutron generation with a yield of.~1.2×10^(4) neutrons per pulse was obtained during d(d,n)^(3)He reaction initiated by the high-voltage nanosecond discharge in a gap with a potential tungsten cylinder(anode)and a grounded deuterated zirconium plate(cathode)f.lled with deuterium at a pressure of.~10^(2) *** duration of.the neutron pulse was ~1.5 *** intensive neutron emission was registered without deuterated *** of.material of.the tungsten electrode was observed during the high-voltage nanosecond discharge in the deuterium,hydrogen,helium and argon at pressures of.10^(2)-10^(4) Pa.

关键词： Neutrons Deuterium High-voltage nanosecond discharge Low-pressure Thermonuclear reaction

The Burden of.Undiagnosed Hypertension and Associated Risk f.ctors among Adults in a Rural Community in Imo Sate, South-East Nigeria

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of.Clinical Medicine 2024年第2期15卷 101-122页

作者： Iwunze Anuli Egwim Jideuma Onuoha f.ank Olekanma Chinonye Ndukwu Chiagozie Igbonagwam Hope Dike victor Department of.f.mily Medicine Federal University Teaching Hospital Owerri Nigeria Department of.Public Health Central Michigan University Mount Pleasant Michigan USA

Background: Cardiovascular diseases are the leading cause of.death globally and hypertension is a major contributor to this burden. Many people with hypertension have poorly controlled blood pressure and up to half.of.the adults with hypertension are unaware of.their hypertensive status due to f.ctors that bother on poor management and poor screening approaches. The implication is that people who have poor access to healthcare especially those in the rural communities are at increased risk of.cardiovascular complications and all-cause mortality. Unf.rtunately, not much has been done to ascertain the burden of.undiagnosed hypertension and associated risk f.ctors in rural communities in Nigeria. Methods: We conducted a community-based cross-sectional study in a rural community in Imo State, Nigeria, on burden of.undiagnosed hypertension with participants recruited via a multi-stage sampling method. An interviewer-administered questionnaire was used, and standardized instruments were applied to obtain, process and analyze the data. Tests of.association between the independent variables and outcome were conducted using logistic regression. P-value of.Results: A total of.380 adults participated in the study. The mean age was 44.2 years. The prevalence of.undiagnosed hypertension was 35.8%. Logistic regression revealed that age, with the respondents in the age groups 26 - 35 years (OR = 10.647, 1.910 - 59.345, p-value = 0.007), 36 - 45 (OR = 3.680, 1.263 - 10.723, p-value = 0.017), 46 - 55 years (OR = 2.737, 1.114 - 6.727, p-value = 0.039), 56 - 65 years old (OR = 3.384, 1.610 - 7.115, p-value = 0.001);and being married (OR = 3.846, 1.118 - 13.233, p-value = 0.033), were independent risk f.ctors f.r undiagnosed hypertension. Conclusion: The prevalence of.undiagnosed hypertension in the rural population of.South-East Nigeria is high. Younger age (26 - 35 years) had the highest odds of.risk f.r occurrence of.hypertension. Also being married was identif.ed as a risk f.ctor f

关键词： Hypertension Undiagnosed Hypertension Risk f.ctors Rural Community

Generation of.Runaway Electrons in Atmospheric Pressure Air Under 30-200 kV Voltage Pulses of. Rise Time 1.5 ns

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

高电压技术 2013年第9期39卷 2112-2118页

作者： Sergey B. Alekseev Mikhail I. Lomaev Dmitry V. Rybka V. f. tarasenko SHAO Tao ZHANG Cheng YAN Ping Institute of.High Current Electronics SB RAS Tomsk 634055 Russia Tomsk Polytechnic University Tomsk 634050 Russia Institute of.Electrical Engineering Chinese Academy of Sciences Beijing 100190 China

A pulse generator with a voltage rise time of.1.5 ns and voltage amplitude variable f.om 30 kV to 200 kV was designed f.r generating runaway electron beams in atmospheric pressure air with dif.erent interelectrode *** inf.uence of.the voltage amplitude and gap length on the generation was *** the gas diode geometry under study,the gap voltage at which the generation of.a runaway electron beam begins was *** the voltage pulse amplitude does not increase the beam current pulse width measured with a time resolution of.0.1 *** is shown that the escape of.beam electrons to the downstream of.the f.il is sync in time with the voltage drop across the gap,and that the delay of.beam current generation increases gradually f.om 1.1 ns to 2.6 ns as the voltage pulse amplitude across the gap decreases f.om～100 kV to 40 kV.

关键词：脉冲上升时间电压幅值逃逸电子大气压力纳秒空气间隙电压脉冲幅度

f.RGING ASIA′S GLOBAL TRANSPARK IN THE PEARL RIVER DELTA AT ZHUHAI

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2003年第4期13卷 300-309页

作者： victor f.S SIT .

The main purpose of.the paper is to introduce the concept of.the Global TransPark (GTP). It is a critical time to develop air logistics inf.astructure in the New Economy. The paper also presents a brief.review of.the air cargo industry in the Asian-Pacif.c region and China,in particular China’s development in the industry as its economy has grown rapidly and globalized in the past two decades. The paper argues that China needs to develop a GTP to support its f.ture growth,and explains why the Pearl River Delta-Hong Kong-Macao city-region or Extended Metropolitan Region (EMR) is the best location. f.nally,it proposes that Zhuhai Airport,one of.the f.ve airports in the EMR,is the best site f.r the GTP. New policies f.om Chinese government as well as close cooperation between local governments of.Guangdong and the two Special Administrative Regions of.Hong Kong and Macao will be needed to make the establishment of.the GTP possible.

关键词： Global TransPark airport air cargo transport Hong Kong Extended Metropolitan Region the Pearl River Delta New Economy