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Heavy ion Beam Probe Measurement in Turbulence Diagnostic Simulator

Plasma Science and Technology 2011年第3期13卷 326-331页

作者： Naohiro KASUYA Seiya NiSHiMURA Masatoshi YAGi Kimitaka itoh sanae-i itoh National institute for Fusion Science 322-60roshi-cho Toki Gifu 509-5292 Japan Research institute for Applied Mechanics Kyushu University 6-1 Kasuga-kouen KasugaFukuoka 816-8580 Japan Japan Atomic Energy Agency 801-1 Mukoyama Naka Ibaraki 311-0193 Japan

A numerical measurement module simulating a heavy ion beam probe was developed, and numerical measurements of electrostatic potential and density fluctuations are carried out for 3-D turbulent data generated by a global simulation of drift-interchange mode turbulence in helical plasmas. The deviation between measured and local values is estimated. it is found that the characteristic structures can be detected in spite of the screening effect due to the finite spatial resolution.

关键词： turbulence structural formation numerical simulation heavy ion beamprobe fluctuation spatial resolution

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Effects of sawtooth heat pulses on edge flows and turbulence in a tokamak plasma

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Plasma Science and Technology 2023年第1期25卷 1-9页

作者：赵开君 Yoshihiko NAGASHiMA 郭志彬 Patrick H DiAMOND 董家齐严龙文 Kimitaka itoh sanae-i itoh 李晓博李继全 Akihide FUJiSAWA Shigeru iNAGAKi 程钧许健强 Yusuke KOSUGA Makoto SASAKi 王正汹张怀强陈俞钱曹小岗余德良刘仪宋显明夏凡王硕 School of Nuclear Science and Engineer East China University of TechnologyNanchang 330013People's Republic of China Research institute for Applied Mechanics Kyushu UniversityKasuga 816-8580Japan School of Physics Peking UniversityBeijing 100871People's Republic of China Center for Momentum Transport and Flow Organization University of California at San DiegoCalifornia 92093United States of America Southwestern institute of Physics Chengdu 610041People's Republic of China institute of Science and Technology Research Chubu UniversityAichi 487-8501Japan Research Center for Plasma Turbulence Kyushu UniversityKasuga 816-8580Japan National institute for Fusion Science Toki 509-5292Japan Department of innovative Energy Science and Engineering Graduate School of EngineeringChubu UniversityAichi 487-8501Japan institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People's Republic of China School of Physics and Optoelectronic Technology Dalian University of TechnologyDalian 116024People's Republic of China

Enhancements of edge zonal flows,radial electric fields,and turbulence are observed in electron cyclotron resonance heating-heated plasmas(Zhao et al 2013 *** 53083011).in this paper,the effects of sawtooth heat pulses on flows and turbulence are *** experiments are performed using multiple Langmuir probe arrays in the edge plasmas of the HL-2A *** edge zonal flows,radial electric fields,and turbulence are all enhanced by *** of the zonal flow and turbulence intensities is also *** delay time of the maximal intensity of the electric fields,zonal flows,and turbulence with respect to the sawtooth crashes is estimated as~1 ms and comparable to that of the sawtooth-triggered intermediate *** only the zonal flows but also the radial electric fields lag behind the ***,the intensities of both the zonal flows and electric fields nearly linearly increase/decrease with the increase/decrease of the turbulence intensity.A double-source predator-prey model analysis suggests that a relatively strong turbulence source may contribute to the dominant zonal flow formation during sawtooth cycles.

关键词： tokamak Langmuir probe arrays edge flows and turbulence sawtooth heat pulses

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Effect of wood density and water permeability on wood decomposition rates of 32 bornean rainforest trees

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Journal of Plant Ecology 2014年第4期7卷 356-363页

作者： sanae Mori Akira itoh Satoshi Nanami Sylvester Tan Lucy Chong Takuo Yamakura Laboratory of Plant Ecology Graduate School of ScienceOsaka City UniversitySugimoto 3-3-138Sumiyoshi-kuOsaka 558-8585Japan Center for Tropical Forest Science Smithsonian Tropical Research Institute and the Arnold ArboretumHarvard University22 Divinity AvenueCambridgeMA 02138USA Applied Forest Science and industry Development Sarawak Forestry CorporationJalan TapangKota SentosaKuching 93250SarawakMalaysia

Aims a better understanding of wood litter decomposition is essential for predicting responses of forest ecosystems to global climate *** studies suggest that chemical properties of wood litters,rather than physical ones such as wood density,are more important for inter-specific differences in wood decomposition ***,empirical data are still limited,especially for tropical *** addition,decom-position rate of wood litter often varies with time,which makes inter-specific comparison *** studied the wood decomposition of 32 rainforest trees to elucidate(i)the degree of interspecific variation in wood decomposition rate of a given size and configuration and(ii)if initial wood density and water permeability are consistent predictors of the overall decomposition rate and its pattern over *** a common garden decomposition experiment was conducted in a tropical rainforest in malaysian borneo for 32 native tree *** wood sticks were set on the forest floor and the weight loss was monitored monthly for 2.7 *** Findings We found large variation in the wood decomposition rate(a 49-fold range),suggesting that we need to consider this variation when cal-culating community-level carbon dynamics of tropical rain *** physical traits of wood,*** density and water permeability,were related to wood decomposition rate and its pattern over *** half-time related positively and negatively to initial wood density and water permeability,*** time-dependentrate model fitted better for 18 species(56%of the study species)that had higher water permeabilities than the others,suggesting that micelle porosity in wood relates to temporal changes in decomposition rate.

关键词： Sarawak carbon dynamics fine wood litter wood density tropical rain forest

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