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Eco-physiological characteristics of Tetracentron sinense *** in response to different light intensities

Journal of Forestry Research 2024年第3期35卷 29-44页

作者： Rong Wang xueheng Lu Hongyan Han Xuemei zhang Yonghong Ma Qinsong Liu Xiaohong Gan Key Laboratoryof Southwest Wildlife Resources Conservation Ministry of EducationChina West Normal UniversityNanchong 637009People's Republic of China Institute of Plant Adaptation and Utilization in Southwest Mountain China West Normal UniversityNanchong 637009People's Republic of China Office of the People's Government of Yuexi County Yuexi County 616650Liangshan Yi Autonomous PrefecturePeople's Republic of China

The regeneration of Tetracentron sinense *** poor in the understory and in open areas due to the charac-teristics of natural regeneration of the species on forest edges and in *** is unclear whether different light intensities in various habitats affect eco-physiological characteristics of saplings and their natural *** this study,the light intensity in *** habitats was simulated by artificial shading(L1:100%NS(natural sunlight)in the open;L2:50%NS in a forest gap or edge;L3:10%NS in understory)to investigate differences in morphology,leaf structure,physiology,and photosynthesis of 2-year-old sap-lings,and to analyze the mechanism of light intensity on sapling *** differences were observed in morphology(including leaf area,and specific leaf area)under different light *** to L1 and L3,chloroplast structure in L2 was *** increasing time,superoxide dismutase(SOD)and catalase(CAT)activities in L2 became gradually higher than under the other light intensities,while malondialdehyde(MDA)content was *** decreased osmoregulation substance contents of leaves but increased *** results suggest that light intensities significantly affect the eco-physiological characteristics of *** saplings and they would respond most favorably at intermediate levels of light by optimizing eco-physiological ***,50%natural sunlight should be created to promote saplings establishment and population recovery of *** during in situ conservation,including sowing mature seeds in forest edges or gaps and providing appropriate shade protection for seedlings and saplings in the open.

关键词： Chloroplast ultrastructure Eco-physiological characteristics Light intensities Sapling establishment Tetracentron sinense Oliv

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An online monitor ionization chamber used in particle therapy

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Nuclear Science and Techniques 2009年第3期20卷 177-180页

作者： TANG Bin HU Zhengguo MAO Ruishi XU Zhiguo WANG Jiansong YUE Ke TU Xiaolin WU Dapeng CHEN Jinda zhang Jie WANG Meng SUN Zhiyu zhang xueheng LI Qiang XU Hushan XIOA Guoqing Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

The clinical trials of tumor therapy using heavy ions beam 12C are now in progress at Institute of Modern Physics in Lanzhou. In order to achieve the precise radiotherapy with the high energy 12C beam in active pencil beam scanning mode, we have developed an ionization chamber(IC) as an online monitor for beam intensity and also a dosimeter after calibration. Through the choosing of working gas and voltage, optimizing of the electrics and the read-out system, calibrating the linearity, the detector system provide us one of the simple and highly reliable way to monitoring the beam during the active pencil beam scanning treatments. The measurement results of this detector system show that it could work well under the condition of high energy 12C beam in active pencil beam scanning mode.

关键词：肿瘤治疗临床离子化粒子

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HIRFL-CSR外靶实验终端Veto探测器的刻度

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原子核物理评论 2024年第1期41卷 453-459页

作者：刘拓琦唐述文孙宇余玉洪方芳王世陶章学恒孙志宇卢奋华傅圣威李治垚魏啸宝徐颖锋中国科学院近代物理研究所兰州730000 中国科学院大学北京100049 东华理工大学核技术应用教育部工程研究中心南昌330013 东华理工大学核科学与工程学院南昌330013 河南师范大学河南新乡453007

使用宇宙射线对兰州重离子加速器冷却储存环(HIRFL-CSR)外靶实验终端(ETF)的Veto探测器开展了刻度工作,工作主要分为位置刻度与时间刻度两部分。位置刻度可给出粒子在探测器上的击中位置,时间刻度则能为粒子在探测器上击中时刻的探测建... 详细信息

使用宇宙射线对兰州重离子加速器冷却储存环(HIRFL-CSR)外靶实验终端(ETF)的Veto探测器开展了刻度工作,工作主要分为位置刻度与时间刻度两部分。位置刻度可给出粒子在探测器上的击中位置,时间刻度则能为粒子在探测器上击中时刻的探测建立统一标准。这些信息是剔除入射到中子墙探测器的带电粒子事件的依据,可为中子墙探测器物理目标的实现提供重要支持。在刻度过程中,得到了Veto探测器的位置分辨半高全宽(FWHM)为2.53 cm,所有单元条时间归一后的时间分辨FWHM为1.09 ns。

关键词： Veto探测器刻度宇宙射线位置分辨时间分辨

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一种高计数率的能损探测器方案研究

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原子核物理评论 2024年第1期41卷 460-466页

作者：卢奋华唐述文傅圣威闫铎马朋杨海波余玉洪章学恒王世陶张永杰方芳刘拓琦徐颖锋李治垚刘相满魏啸宝孙志宇中国科学院近代物理研究所兰州730000 中国科学院大学北京100049 兰州大学核科学与技术学院兰州730000 河南师范大学物理学院河南新乡453007

正在建设中的强流重离子加速器装置HIAF配备了一条先进的放射性束流线HFRS,建成后将为中国高能放射性核束物理研究提供新的机遇。HFRS的特点是流强极高(初级束流强度1×10^(11) ppp),这对用于粒子鉴别的能损探测器提出了非常高的计数率... 详细信息

正在建设中的强流重离子加速器装置HIAF配备了一条先进的放射性束流线HFRS,建成后将为中国高能放射性核束物理研究提供新的机遇。HFRS的特点是流强极高(初级束流强度1×10^(11) ppp),这对用于粒子鉴别的能损探测器提出了非常高的计数率要求。传统的能损探测器对信号处理一般依次采用电荷灵敏前放、主放大器、ADC的技术路线。该方案存在电子学响应速度较慢、灵活性较差、难以处理高计数率下信号堆积严重等问题。我们对此提出一种新的适用于高计数率的能损探测器方案:以耐辐照的多次取样电离室为能损探测器,优化结构和读出方式提高探测器响应速度,使用快电荷灵敏前放对能损探测器信号初步放大后、直接用波形数字化仪采集波形再进行后续数字算法处理。并利用放射源和束流对该方案进行了验证测试。利用3组分α源测试时,对采集的波形使用数字成形算法处理,能量分辨率(FWHM)可达1.31%。在放射性次级束流线RIBLL2提供300 MeV/u的~(56)Fe束流测试中,采用时间常数τ_(f)=2μs的快电荷灵敏前放在计数率接近1 MHz时仍未发生明显堆积。

关键词： HFRS 电离室高计数率快电荷灵敏前放波形采样数字成形算法

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2 - 19 Test Experiment for Pion Measurement at ETF

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IMP & HIRFL Annual Report 2010年第1期 58-59页

作者： Wang Shitao Sun Zhiyu Yu Yuhong zhang xueheng Tang Shuwen Liu Longxiang

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5-19 Research Progress in Group of RIB Physics in 2015

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IMP & HIRFL Annual Report 2015年第1期 242-243页

作者： Sun Zhiyu zhang xueheng Yu Yuhong Yue Ke Wang Shitao Tang Shuwen Chen Jinda Fang Fang 不详

The progress of research going on in Group of Rare Isotope Beam Physics (RIB), Experimental Physics Research Center, in 2015 is in the following two aspects. Construction of the plastic scintillator detector array (PSD) for the DArk Matter Particle Explorer (DAMPE) *** is part of the “Strategic Priority Research Program” of the Chinese Academy of Science for space science, and it is a large space telescope aimed for the evidence of dark matter existence through the measurements of their decay products.

关键词： Research Progress Group

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Research Progress in Group of RIB Physics in 2017

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IMP & HIRFL Annual Report 2017年第1期 177-178页

作者： Sun Zhiyu zhang xueheng Yu Yuhong Yue Ke Wang Shitao Tang Shuwen Chen Jinda Yan Duo Fang Fang zhang Yongjie 不详

The progress of research going on in Group of Rare Isotope Beam Physics(RIB),Experimental Physics Research Center,in 2017 is in the following three *** in-orbit calibration and data analysis works for the plastic scintillator detector(PSD)of the DArk Matter Particle Explorer(DAMPE).The DAMPE satellite has worked more than 2 years in the desired orbit till *** we continued the calibration and data analysis works for the whole *** the year,the calibration methods for the PSD were improved and even better performance were obtained,both in charge resolution and efficiency,which leads to a less contamination for the Z=1 charged particles and better e/*** important results have already been obtained and published by the DAMPE collaboration group,such as the more accurate high energy electron spectrum up to 4.6 TeV,which comes from the obtained data of 530 days in orbit(Fig.1).

关键词： separation. desired continued

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5-1 Research Progress in the Group of RIB Physics in 2016

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IMP & HIRFL Annual Report 2016年第1期 205-206页

作者： Sun Zhiyu zhang xueheng Yu Yuhong Yue Ke Wang Shitao Tang Shuwen Chen Jinda Fang Fang 不详

The progress of researches going on in the Group of Rare Isotope Beam Physics(RIB),Experimental Physics Research Center,in 2016 is in the following three *** in-orbit calibration and data analysis works for the plastic scintillator detector(PSD)of the Dark Matter Particle Explorer(DAMPE).The DAMPE satellite has been launched and got into its desired orbit successfully in Dec.17,2015,and we focused on the calibration and data analysis works for the whole *** than 1 billion high energy events have already been detected by DAMPE and we also get some preliminary *** analysis results show that the PSD works very stable in the whole year,and the performance,such as efficiency and charge resolution shown in Fig.1,are even better then we obtained on earth.

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Research progress in Group of RIB Physics in 2018

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IMP & HIRFL Annual Report 2018年第1期 46-47页

作者： Sun Zhiyu zhang xueheng Yu Yuhong Yue Ke Wang Shitao Tang Shuwen Chen Jinda Yan Duo Fang Fang zhang Yongjie 不详

The progress of research going on in Group of Rare Isotope Beam Physics(RIB),Experimental Physics Research Center,in 2018 is in the following two ***-nucleon removal reactions with beam energy of hundreds MeV/u have been proved to be an effective method for probing the structure of nuclei far from *** this is also a focus for the research works at *** 2018,based on lots of works for detector improvements in the past years。

关键词： stability. MeV/u Rare

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A Standard Time Resolution Detecting System for TOF-PET

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近代物理研究所和兰州重离子加速器实验室年报：英文版 2008年第1期 31-32页

作者： Chen Jinda Xu Hushan Guo Zhongyan Chen Ruofu Hu Zhenguo Tang Bin Yue Ke zhang xueheng Yu Yuhong

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