检索结果-南通市图书馆

Numerical study of plas.a. s.a.t-up by electron cyclotron waves in NCsT spherical tokamak and CN-H1 stellarator

Plas.a.science and Technology 2024年第7期26卷 12-22页

作者：刘亿卓行郑平卫龚学余尹岚陈小昌钟翊君杨文军 school of Nuclear science and Technology University of South ChinaHengyang 421001People’s Republic of China school of Resource Environmentand Safety EngineeringUniversity of South ChinaHengyang 421001People’s Republic of China school of Electrical Engineering University of South ChinaHengyang 421001People’s Republic of China school of Physics.a.d Materials Nanchang UniversityNanchang 330031People’s Republic of China

According to the physics of tokamak s.a.t-up,this study constructs.a.zero-dimensional(0D)model applicable to electron cyclotron(EC)wave assisted s.a.t-up in NCsT spherical torus(spherical tokamak)and CN-H1 *** the constructed 0D model,the results obtained in this study under the same conditions.a.e compared and validated against reference results for pure hydrogen plas.a.s.a.t-up in *** results.a.e in good agreement,especially regarding electron temperature,ion temperature and plas.a.*** the presence of finite Ohmic electric field in the spherical tokamak,a study on the EC wave assisted s.a.t-up of the NCsT plas.a.at frequency of 28 GHz is *** impact of the vertical magnetic field B_(v)on EC wave assisted s.a.t-up,the relationship between EC wave injection power P_(inj),Ohmic electric field E,and initial hydrogen atom density n_(H0)are explored *** is found that under conditions of Ohmic electric field lower than ITER(~0.3 V m^(-1)),EC wave can expand the operational s.a.e to achieve better plas.a.*** the process of28 GHz EC wave s.a.t-up in the CN-H1 stellarator plas.a.the plas.a.current in the zerodimensional model is replaced with the current in the poloidal coil of the *** s.a.tup can be successfully achieved at injection powers in the hundreds of kilowatts range,resulting in electron densities on the order of 10^(17)-10^(18)m^(-3).

关键词： spherical torus stellarator electron cyclotron wave s.a.t-up 0D model

来源：

维普期刊数据库

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

Preparation of Laser Cladding Coating Undercooling Cu-based Alloy and Co on Non-equilibrium solidification structure

引用

Journal of Wuhan University of Technology(Materials science) 2024年第2期39卷 463-472页

作者：田徐铭 CAO shichao HOU Kai HOU Xiaopeng WANG Hongfu 张煜 Department of Outpatient Xinzhou People’s HospitalXinzhou 034099China school of Mechanical Engineering North University of ChinaTaiyuan 030051China Department of Neurosurgery Xinzhou People’s HospitalXinzhou 034099China Department of Orthopedics Xinzhou People’s HospitalXinzhou 034099China

The effect of the gradient content of Co element on the solidification process of Cu-based alloy under deep under cooling conditions was *** non-equilibrium solidification structure of the under cooled alloy samples were *** is found that the rapidly solidified alloy has undergone twice grain refinement during the undercooling *** and significance of the maximum undercooling refinement structure of Cu60Ni35Co5 at T=253 K were ***-density defects were observed,such as dislocations,s.a.king faults networks.a.d twinning *** s.a.dard FCC diffraction pattern represents that it is still a single-phase *** on the metallographic diagram,EBsD and TEM data analysis,it is illustrated that the occurrence of grain refinement under high undercooling is due to stress induced *** addition,the laser cladding technology is used to coat Co-based alloy(stellite12) coating on 304 s.a.nless steel substrate;the microstructure of the coating cross-section was *** was found that the microstructure of the cross-section is presented as columnar crys.a.s,planar crys.a.s.a.d disordered growth direction,so that the coating has better hardness.a.d wear *** electrochemical corrosion of the substrate and coating,it can be seen that the Co and Cr elements present in the coating are more likely to form a dense passivation film,which improved the corrosion resis.a.ce of the coating.

关键词： non-equilibrium solidification structure undercooling recrys.a.lization laser cladding coating

来源：

维普期刊数据库

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

Manipulating Crys.a. Growth and secondary Phase PbI_(2)to Enable Efficient and s.a.le Perovskite solar Cells with Natural Additives

引用

Nano-Micro Letters 2024年第9期16卷 432-448页

作者： Yirong Wang Yaohui Cheng Chunchun Yin Jinming Zhang Jingxuan You Jizheng Wang Jinfeng Wang Jun Zhang Institute of Chemistry Chinese Academy of Sciences(CAS)Beijing 100190People’s Republic of China University of Chinese Academy of sciences Beijing 100049People’s Republic of China Nanjing University Nanjing 210023People’s Republic of China Wuhan Textile University Wuhan 430200People’s Republic of China

In perovskite solar cells(PsCs),the inherent defects of perovskite film and the random distribution of excess lead iodide(PbI_(2))prevent the improvement of efficiency and ***,natural cellulose is used as the raw material to design a series of cellulose derivatives for perovskite crys.a.lization *** cationic cellulose derivative C-Im-CN with cyano-imidazolium(Im-CN)cation and chloride anion prominently promotes the crys.a.lization process,grain growth,and directional orientation of ***,excess PbI_(2)is transferred to the surface of perovskite grains or formed plate-like crys.a.lites in local *** effects result in suppressing defect formation,decreasing grain boundaries,enhancing carrier extraction,inhibiting non-radiative recombination,and dramatically prolonging carrier ***,the PsCs exhibit a high power conversion efficiency of 24.71%.Moreover,C-Im-CN has multiple interaction sites.a.d polymer skeleton,so the unencapsulated PsCs maintain above 91.3%of their initial efficiencies.a.ter 3000 h of continuous operation in a conventional air atmosphere and have good s.a.ility under high humidity *** utilization of biopolymers with excellent structure-designability to manage the perovskite opens.a.s.a.e-of-the-art avenue for manufacturing and improving PsCs.

关键词： Perovskite solar cells Defect passivation Biomass.a.ditives Crys.a. orientation

来源：

维普期刊数据库

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

A dual-route optical emission spectroscopy diagnostic with wide spectral range and high wavelength resolution on HL-2A tokamak

引用

Plas.a.science and Technology 2024年第3期26卷 25-30页

作者：陈越高继昆龙婷聂林高金明马尧黄渊田文静刘延民朱晓东庄革钟武律许敏 school of Physical sciences School of Nuclear Sciences and TechnologyUniversity of Science and Technology of ChinaHefei 230026People's Republic of China southwestern Institute of Physics Chengdu 610041People's Republic of China Tsinghua University Beijing 100084People's Republic of China

A dual-route optical emission spectroscopy(D-OEs)diagnostic is newly developed to monitor the optical emission from the X-point plas.a.region on the HL-2 A *** diagnostic is composed of an imaging system,a beam-splitting system for dual-route measurements,fiber bundles.a.spectrometer system,and a control and acquisition *** route is used to obtain wide-spectral-range spectra,and the other route is used to acquire high-wavelengthresolution line *** spectral resolution of the wide-range spectrometers is 0.8 nm with a coverage of 800 nm(@200-1000 nm).The spectral resolution of the high-resolution spectrometer is 0.01 nm with a coverage of 6 nm(@200-660 nm).The s.a.ial resolution of each route of D-OEs is.a.out 4 cm with 11 *** temporal resolution is 16 ms.a. maximum in the single-channel ***-range spectra(containing Balmer series.a.d a Fulcher band)and highly resolved Ha line s.a.es.a.e obtained by D-OEs in the hydrogen glow discharge in the lab.D-OEs measurements.a.e carried out in the high-density deuterium experiments of *** electron density n_(e)and deuterium temperature T_(D) in the X-point multifaceted asymmetric radiation from the edge(MARFE)region are derived simultaneously by fitting the measured D_(a) *** density n_(e)is observed to increase from~8.7×10^(18)m^(-3)to~7.8×10^(19)m^(-3),and the temperature T_(D)drops from~14.4 eV to~2.3 eV after the onset of MARFE in the discharge#38260.

关键词： optical emission spectroscopy Balmer series tokamak

来源：

维普期刊数据库

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

Observation of Doppler shift f_(D) modulated by the internal kink mode using conventional reflectometry in the EAsT tokamak

引用

Plas.a.science and Technology 2024年第3期26卷 1-9页

作者：李恭顺张涛耿康宁文斐叶凯萱徐立清朱翔张学习钟富彬周振杨书琪周子强喻琳兰婷王守信提昂张寿彪刘海庆李国强高翔 the EAsT Team Institute of Plas.a.Physics Chinese Academy of SciencesHefei 230031People's Republic of China Advanced Energy Res.a.ch Center Shenzhen UniversityShenzhen 518060People's Republic of China University of science and Technology of china Hefei 230026People's Republic of China

In this paper we present a new experimental observation using a conventional reflectometry technique,poloidal correlation reflectometry(PCR),in the Experimental Advanced superconducting Tokamak(EAsT).The turbulence spectrum detected by the PCR system exhibits.a. asymmetry and induced Doppler shift f_(D)during the internal kink mode(IKM)rotation *** Doppler shift f_(D)is the target measurement of Doppler reflectometry,but captured by conventional *** show that the Doppler shift f_(D)is modulated by the periodic changes in the effective angle between the probing wave and cutoff layer normal,but not by plas.a.*** fishbone mode and saturated long-lived mode are typical IKMs.a.d this modulation phenomenon is observed in both ***,the value of the Doppler shift f_(D)is positively correlated with the amplitude of the IKM,even when the latter is ***,the positive and negative frequency components of the Doppler shift f_(D)can be asymmetric,which is related to the plas.a.configuration.A simulated analysis is performed by ray tracing to verify these *** results es.a.lish a clear link between f_(D)and IKM rotation,and are helpful for studying the characteristics of IKM and related physical phenomena.

关键词： microwave reflectometry Doppler shift internal kink mode

来源：

维普期刊数据库

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

Modification of streamer-to-leader transition model based on radial thermal expansion in the sphere-plane gap discharge at high altitude

引用

Plas.a.science and Technology 2024年第1期26卷 42-49页

作者：耿江海林果王平丁玉剑丁杨俞华 Department of Electric Power Engineering North China Electric Power UniversityBaoding 071003People’s Republic of China china Electric Power Res.a.ch Institute Beijing 100192People’s Republic of China Xinjiang Electric Power Company Res.a.ch Institute Urumchi 830000People’s Republic of China s.a.xi Electric Power Company Res.a.ch Institute Taiyuan 030001People’s Republic of China

Historically,streamer-to-leader transition studies mainly focused on the rod-plane gap and low altitude analysis,with limited attention paid to the sphere-plane gap at high altitude *** this work,sphere-plane gap discharge tests were carried out under the gap dis.a.ce of 5 m at the Qinghai Ultra High Voltage(UHV)test base at an altitude of 2200 *** experiments measured the physical parameters such as the discharge current,electric field intensity and ins.a.taneous optical *** duration of the dark period and the critical charge of streamer-toleader transition were obtained at high *** on radial thermal expansion of the streamer stem,we es.a.lished a modified streamer-to-leader transition model of the sphere-plane gap discharge at high altitude,and calculated the stem temperature,stem radii and the duration of streamer-to-leader *** with the measured duration of sphere-plane electrode discharge at an altitude of 2200 m,the error rate of the modified model was 0.94%,while the classical model was 6.97%,demonstrating the effectiveness of the modified *** the comparisons.a.d analysis,several suggestions.a.e proposed to improve the numerical model for further quantitative investigations of the leader inception.

关键词： streamer-to-leader transition model high altitude streamer stem convective diffusion radial thermal expansion

来源：

维普期刊数据库

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

Novel method for identifying the s.a.es of discharge underwater based on impedance change characteristic

引用

Plas.a.science and Technology 2024年第4期26卷 133-145页

作者：高崇康忠健龚大建张扬王玉芳孙一鸣 Department of New Energy China University of PetroleumQingdao 266580People’s Republic of China s.a.ghai Ruida Fengzhi science and Technology Corporation Shanghai 201703People’s Republic of China china National Petroleum Group General Res.a.ch Institute of Engineering and Technology Corporation Beijing 100029People’s Republic of China Oil and Gas Resource survey Center China Geological SurveyBeijing 100083People’s Republic of China

It is difficult to determine the discharge s.a.es in a fixed time of repetitive discharge underwater due to the arc formation process being susceptible to external environmental influences. This paper proposes.a.novel underwater discharge s.a.e identification method based on the strong Tracking Filter(sTF) and impedance change characteristics. The time-varying equivalent circuit model of the discharge underwater is es.a.lished based on the plas.a.theory analysis of the impedance change characteristics.a.d mechanism of the discharge process. The sTF is used to reduce the randomness of the impedance of repeated discharges underwater, and then the universal identification resis.a.ce data is obtained. Based on the resis.a.ce variation characteristics of the discriminating resis.a.ce of the pre-breakdown, main, and oscillatory discharge s.a.es, the threshold values for determining the discharge s.a.e are obtained. These include the threshold values for the resis.a.ce variation rate(K) and the moment(t).Experimental and error analysis results demonstrate the efficacy of this innovative method in discharge s.a.e determination, with a maximum mean square deviation of scrless than 1.761.

关键词： discharge underwater discharge s.a.e identification impedance characteristics strong tracking filter

来源：

维普期刊数据库

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

The multi-peak point phenomenon of broadband microwave reflection caused by inhomogeneous plasma

引用

Plas.a.science and Technology 2024年第7期26卷 1-11页

作者：杨敏齐凯旋杨玖文贾飒刘浩岩陈燕扬李瑾李小平 school of Aeros.a.e science and Technology Xidian UniversityXi’an 710071People’s Republic of China Taiyuan satellite Launch Center Taiyuan 030173People’s Republic of China Beijing Institute of Nears.a.e Vehicle’s systems Engineering Beijing 100076People’s Republic of China

During s.a.ecraft re-entry,the challenge of measuring plas.a.sheath parameters directly contributes to difficulties in addressing communication *** this work,we have discovered a phenomenon of multiple peaks in reflection data caused by the inhomogeneous *** results show that the multi-peak points fade away as the characteristic frequency is.a.proached,resembling a series of gradually decreasing *** positions.a.d quantities of these points.a.e positively correlated with electron density,yet they show no relation to collision *** phenomenon is of significant reference value for future studies on the s.a.ial distribution of plas.a.,particularly for using microwave reflection signals in diagnosing the plas.a.sheath.

关键词： plas.a.sheath microwave reflection inhomogeneous plasma

来源：

维普期刊数据库

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

Numerical analysis for the free-boundary current reversal equilibrium in the AC plas.a.current operation in a tokamak

引用

Plas.a.science and Technology 2024年第2期26卷 22-30页

作者：胡业民王柳青白书航于治夏天阳 Institute of Plas.a.Physics Chinese Academy of SciencesHefei 230031People's Republic of China University of science and Technology of china Hefei 230026People's Republic of China Institutes of Physical science and Information Technology Anhui UniversityHefei 230601People's Republic of China

In recent decades, tokamak discharges with zero total toroidal current have been reported in tokamak experiments, and this is one of the key problems in alternating current(AC) *** efficient free-boundary equilibrium code is developed to investigate such advanced tokamak discharges with current reversal equilibrium configuration. The calculation results show that the reversal current equilibrium can maintain finite pressure and also has considerable effects on the position of the X-point and the magnetic separatrix s.a.e, and hence also on the position of the strike point on the divertor plates, which is extremely useful for magnetic design, MHD s.a.ility analysis, and experimental data analysis etc. for the AC plas.a.current operation on tokamaks.

关键词： current reversal equilibrium AC operation free-boundary equilibrium tokamak

来源：

维普期刊数据库

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

Quantification of Central and Eastern china's.a.mospheric CH_(4) enhancement changes.a.d its contributions based on machine learning approach

引用

Journal of Environmental sciences 2024年第4期138卷 236-248页

作者： Xinyue Ai Cheng Hu Yanrong Yang Leying Zhang Huili Liu Junqing Zhang Xin Chen Guoqiang Bai Wei Xiao College of Biology and the Environment Joint Center for sustainable Forestry in Southern ChinaNanjing Forestry UniversityNanjing 210037China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD) Nanjing University of Information Science&TechnologyNanjing 210044China Guang’an Vocational&Technical College Guangan 638550China HuaNan Meteorological Administration Huanan 154400China

Methane is the second largest anthropogenic greenhouse gas.a.d changes in atmospheric methane concentrations can reflect the dynamic balance between its emissions.a.d ***,the monitoring of CH_(4) concentration changes.a.d the assessment of underlying driving factors can provide scientific basis for the government’s policy making and *** is the world’s largest emitter of anthropogenic ***,due to the lack of ground-based observation sites,little work has been done on the s.a.ial-temporal variations for the past decades.a.d influencing factors in china,especially for areas with high anthropogenic emissions.a. Central and Eastern *** to quantify atmospheric CH_(4) enhancements trends.a.d its driving factors in Central and Eastern china,we combined the most up-to-date TROPOMI satellite-based column CH_(4)(xCH_(4))concentration from 2018 to 2022,anthropogenic and natural emissions.a.d a random forest-based machine learning approach,to simulate atmospheric xCH_(4) enhancements from 2001 to *** results showed that(1)the random forest model was.a.le to accurately es.a.lish the relationship between emission sources.a.d xCH_(4) enhancement with a correlation coefficient(R^(2))of 0.89 and a root mean-square error(RMsE)of 11.98 ppb;(2)The xCH_(4) enhancement only increased from 48.21±2.02 ppb to 49.79±1.87 ppb from the year of 2001 to 2018,with a relative change of 3.27%±0.13%;(3)The simulation results showed that the energy activities.a.d waste treatment were the main contributors to the increase in xCH_(4) enhancement,contributing 68.00% and 31.21%,respectively,and the decrease of animal ruminants contributed-6.70% of its enhancement trend.

关键词： TROPOMI Methane column concentrations Anthropogenic sources Random Forest model

来源：

维普期刊数据库

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

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：