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| 1 | Milliampere He^2+ beam generator using a compact GHz ECRIS显示文摘Multi-charged helium ion beam He2+ is useful for helium accelerator to obtain a higher energy with lower cost and for deuterium accelerator to avoid neutron activation during machine commissioning.An attempt to generate milliampere multi-charged helium He2+ion beam with a 2.45 GHz electron cyclotron resonance ion source(ECRIS) was tested recently.A design using a specfic permanent magnet 2.45 GHz ECRIS(PMECRIS) source(ERCIS) is reported and the He2+beam production ability is described.With this source,we produced a total helium beam of 40 mA at 40 kV with 180 W of net microwave power and a gas flow of less than 0.5 sccm.At steady state the He2+beam intensity is 4.4 mA,that being the fraction of multi-charged helium ion beam is at approximately 11%. | REN HaiTao PENG ShiXiang XU Yuan ZHAO Jie CHEN Jia ZHANG Tao ZHANG AiLin GUO ZhiYu CHEN JiaEr | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，10： | 2 |
| 2 | Progress in the beam commissioning of separated function RFQ accelerator显示文摘Separated Function RFQ (SFRFQ) was proposed as a post accelerator of RFQ to accelerate heavy ions at low frequency. It introduces gap accelerating in the quadrupole electrodes, and therefore it has higher accelerating efficiency than the conventional RFQ accelerator. The first SFRFQ prototype cavity has been specially designed and constructed as a post accelerator to accelerate O+ beam from 1.03 MeV to 1.64 MeV. Based on accomplishment of low power measurement and high power test, the beam commissioning was carried out to verify its feasibility. The measured energy gain per cell of SFRFQ is 45 keV, which is about 60% higher than that of Peking University Integral Split Ring (ISR) RFQ. | MingLei Kang (1) YuanRong Lu (1) Zhi Wang (1) Kun Zhu (1) XueQing Yan (1) ZhiYu Guo (1) ShuLi Gao (1) ShiXiang Peng (1) Ao Liu (2) JiaXun Fang (1) JiaEr Chen (1) | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，S2： | 2 |
| 3 | Milliampere He2+ beam generator using a compact GHz ECRIS显示文摘 | Haitao Ren Shixiang Peng Yuan Xu Jie Zhao Jia Chen Tao Zhang Ailin Zhang Zhiyu Guo and Jiaer Chen | | SCIENCE CHINA Physics Mechanics & Astronomy 00，，： | 1 |
| 4 | Minipermanent magnet high-current microwave ion source显示文摘 | SONG Zhizhong PENG Shixiang YU Jinxiang | 2006 | Review of Scientific Instruments2006，77，03： | 1 |
| 5 | Development of High Intensity Beam Emittance Measurement Unit显示文摘Three sets of High Intensity Beam Emittance Measurement Units (HIBEMUs) are being developed at Peking University. They are HIBEMU-2 (slit-wire type, one direction), HIBEMU-3 (Allison scanner type, one direction) and HIBEMU-4 (slit-wire type, two directions). For HIBEMU-2 and HIBEMU-3, more recent work has been done on software redesign in order to measure beam emittance and to draw phase diagram more efficiently and precisely. Software for control and data processing of them were developed in Labveiw environment, trying to improve calculation rationality and to offer user-friendly interface. Mechanical modification was also done for HIBEMU-3, mainly concentrating on the protection of Faraday cups from being overheated by the high intensity beam and also from interference of secondary electrons. This paper will also cover the mechanical structure as well as the software development of HIBEMU-4, which is a two-direction emittance scanner newly designed and manufactured for the high energy beam transport (HEBT) of Peking University Neutron Imaging FaciliTY (PKUNIFTY). At the end of this paper, comparison and analysis of the three HIBEMUs are given to draw forth better design of the future emittance measurement facility. | LV PengNan PENG ShiXiang GUO ZhiYu YUAN ZhongXi REN HaiTao ZHAO Jie ZHANG Meng CHEN JiaEr LU YuanRong | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，S2： | 1 |
| 6 | Visualization of supramolecular assembly by aggregation-induced emission显示文摘Supramolecular architectures are constructed by the self-assembly of small building blocks via the use of metal-ligand coordination,π–πstacking interactions,hydrogen bonding,host-guest interactions,and other noncovalent driving forces,which confer unique dynamic reversibility and stimulus responsiveness to the supramolecular materials and also lead to the demand of expensive and complex equipment for the characterization of supramolecular assembly processes.Fortunately,the self-assembly processes bring the monomeric chromophores together,offering possibilities to establish ties between the supramolecular assembly and aggregation-induced emission(AIE)techniques.Compared to conventional luminescent molecules,AIE luminogens(AIEgens)exhibit significant fluorescence enhancement upon the restriction of molecular motions,thus displaying the advantages of signal amplification and low background noises.Given the above,the real-time,sensitive,and in situ visualization of the formation of self-assemblies and their stimuli responsiveness based on AIE becomes accessible.Here,we review recent works that encompass the visualization of supramolecular assembly-related behaviors by means of AIE characteristics of chromophores.The organization of this review will be by different types of supramolecular architectures,including metallacycles/cages,micelles/vesicles,supramolecular polymers,and supramolecular gels.An overview of future opportunities and challenges for the real-time monitoring of supramolecular assembly by AIE is also provided. | Wu-Jie Guo Tuokai Peng Wenping Zhu Shixiang Ma Guang Wang Ying Li Bin Liu Hui-Qing Peng | 2023 | Aggregate2023，4，2： | 0 |
| 7 | Antagonistic MADS-box transcription factors SEEDSTICK and SEPALLATA3 form a transcriptional regulatory network that regulates seed oil accumulation显示文摘Transcriptional regulation is essential for balancing multiple metabolic pathways that influence oil accumulation in seeds.Thus far,the transcriptional regulatory mechanisms that govern seed oil accumulation remain largely unknown.Here,we identified the transcriptional regulatory network composed of MADS-box transcription factors SEEDSTICK(STK)and SEPALLATA3(SEP3),which bridges several key genes to regulate oil accumulation in seeds.We found that STK,highly expressed in the developing embryo,positively regulates seed oil accumulation in Arabidopsis(Arabidopsis thaliana).Furthermore,we discovered that SEP3 physically interacts with STK in vivo and in vitro.Seed oil content is increased by the SEP3 mutation,while it is decreased by SEP3 overexpression.The chromatin immunoprecipitation,electrophoretic mobility shift assay,and transient dual-luciferase reporter assays showed that STK positively regulates seed oil accumulation by directly repressing the expression of MYB5,SEP3,and SEED FATTY ACID REDUCER 4(SFAR4).Moreover,genetic and molecular analyses demonstrated that STK and SEP3 antagonistically regulate seed oil production and that SEP3 weakens the binding ability of STK to MYB5,SEP3,and SFAR4.Additionally,we demonstrated that TRANSPARENT TESTA 8(TT8)and ACYL-ACYL CARRIER PROTEIN DESATURASE 3(AAD3)are direct targets of MYB5 during seed oil accumulation in Arabidopsis.Together,our findings provide the transcriptional regulatory network antagonistically orchestrated by STK and SEP3,which fine tunes oil accumulation in seeds. | Shuangcheng He Yuanchang Min Zijin Liu Fang Zhi Rong Ma Ankang Ge Shixiang Wang Yu Zhao Danshuai Peng Da Zhang Minshan Jin Bo Song Jianjun Wang Yuan Guo Mingxun Chen | 2024 | Journal of Integrative Plant Biology2024，66，1： | 0 |
| 8 | Multiple charge ion beam generation with a 2.45 GHz electron cyclotron resonance ion source显示文摘Multiple charge ions (MCIs) are necessary for increasing the output energy of particles in accelerators. In general, MCI beams are largely produced by electron beam ion source (EBIS) [1], laser ion source (LIS) [2], or high-frequency (mostly >5 GHz) electron cyclotron resonance (ECR) ion source [3]. Among these, only ECR ion source can operate in the continuous wave (CW) mode, while EBIS and LIS only support pulses. In addition, ECR ion source with lower frequency (mostly 2.45 GHz) are required primarily for generating single charge state ions, because the corresponding ECR field (875 Gs) is not sufficiently strong for MCI generation [4]. | Yuan Xu ShiXiang Peng HaiTao Ren JiaMei Wen AiLin Zhang Tao Zhang JingFeng Zhang WenBin Wu ZhiYu Guo JiaEr Chen | 2017 | Science China(Physics,Mechanics & Astronomy)2017，60，6： | 0 |
| 9 | Plasma parameter diagnosis using hydrogen emission spectra of a quartz-chamber 2.45 GHz ECRIS at Peking University显示文摘A quartz-chamber 2.45 GHz electron cyclotron resonance ion source(ECRIS) was designed for diagnostic purposes at Peking University [Patent Number: ZL 201110026605.4]. This ion source can produce a maximum 84 m A hydrogen ion beam at 50 k V with a duty factor of 10%. The root-mean-square(RMS) emittance of this beam is less than 0.12π mm mrad. In our initial work,the electron temperature and electron density inside the plasma chamber had been measured with the line intensity ratio of noble gases. Based on these results, the atomic and molecular emission spectra of hydrogen were applied to determine the dissociation degree of hydrogen and the vibrational temperature of hydrogen molecules in the ground state, respectively. Measurements were performed at gas pressures from 4×10^(-4) to 1×10^(-3) Pa and at input peak RF power ranging from 1000 to 1800 W. The dissociation degree of hydrogen in the range of 0.5%-10% and the vibrational temperature of hydrogen molecules in the ground state in the range of 3500-8500 K were obtained. The plasma processes inside this ECRIS chamber were discussed based on these results. | WenBin Wu HaiTao Ren ShiXiang Peng Yuan Xu JiaMei Wen Tao Zhang JingFeng Zhang AiLin Zhang Jiang Sun ZhiYu Guo JiaEr Chen | 2018 | Science China(Physics,Mechanics & Astronomy)2018，61，4： | 0 |
| 10 | Unveiling size-fluorescence correlation of organic nanoparticles and its use in nanoparticle size determination显示文摘Quantitatively establishing the correlation between nanoparticle size and fluorescence is essential for understanding the behavior and functionality of fluorescent nanoparticles(FNPs).However,such exploration focusing on organic FNPs has not been achieved to date.Herein,we employ the use of supramolecular polymeric FNPs prepared from tetraphenylethylene-based bis-ureidopyrimidinone monomers(bis-UPys)to relate the size to the fluorescence of organic nanoparticles.At an equal concentration of bis-UPys,a logarithmic relationship between them is built with a correlation coefficient higher than 0.96.Theoretical calculations indicate that variations in fluorescence intensity among FNPs of different sizes are attributed to the distinct molecular packing environments at the surface and within the interior of the nanoparticles.This leads to different nonradiative decay rates of the embedded and exposed bis-UPys and thereby changes the overall fluorescence quantum yield of nanoparticles due to their different specific surface areas.The established fluorescence intensity-size correlation possesses fine universality and reliability,and it is successfully utilized to estimate the sizes of other nanoparticles,including those in highly diluted dispersions of FNPs.This work paves a new way for the simple and real-time determination of nanoparticle sizes and offers an attractive paradigm to optimize nanoparticle functionalities by the size effect. | Wu-Jie Guo Shixiang Ma Hui Wang Lu Qiao Lei Chen Chenyu Hong Bin Liu Xiaoyan Zheng Hui-Qing Peng | 2024 | Aggregate2024，5，1： | 0 |
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