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10B-doped MCP detector developed for neutron resonance imaging at Back-n white neutron source

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Nuclear Science and Techniques 2024年第8期35卷 58-68页

作者： Qiang Li Li‑Jiao Wang Jing‑Yu Tang Xiang‑Biao Qiu Zhen Chen Mao‑Yuan Zhao Chang‑Jun Ning Kai Pan Wei Xu tao Li Su‑Peng Lu Han Yi Rui‑Rui Fan Chang‑Qing Feng Rong Zhang Xiao‑Yang Sun Qi An Hao‑Fan Bai Jiang‑Bo Bai Jie Bao Ping Cao Qi‑Ping Chen Yong‑Hao Chen Zeng‑Qi Cui An‑Chuan Fan Fan‑Zhen Feng Min‑Hao Gu Chang‑Cai Han Zi‑Jie Han guo‑Zhu He Yong‑Cheng He Yang Hong Yi‑Wei Hu Han‑Xiong Huang Wei Jiang Zhi‑Jie Jiang Zheng‑Yao Jin Ling Kang Bo Li Gong Li Xiao Li Yang Li Jie Liu Rong Liu Shu‑Bin Liu Yi‑Na Liu Guang‑Yuan Luan Jie Ren Zhi‑Zhou Ren Xi‑Chao Ruan Zhao‑Hui Song Kang Sun Zhi‑Xin Tan Sheng‑Da Tang Jin‑Cheng Wang Peng‑Cheng Wang Zhao‑Hui Wang Zhong‑Wei Wen Xiao‑Guang Wu Xuan Wu Cong Xia Yong‑Ji Yu guo‑Hui Zhang Hang‑Chang Zhang Lin‑Hao Zhang Qi‑Wei Zhang Xian‑Peng Zhang Yu‑Liang Zhang yue Zhang Zhi‑Yong Zhang Zhi‑Hao Zhou Ke‑Jun Zhu Chong Zou Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China state key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Dongguan Songshan Lake Future School Dongguan 523808China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China state key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China North Night Vision Science and Technology(Nanjing)Research Institute Co.Ltd Nanjing 211106China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China state key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of Modern Physics Fudan UniversityShanghai 200433China key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China china Academy of Engineering Physics Institute of Nuclear Physics and ChemistryMianyang 621900China USTC archaeometry lab University of Science and Technology of ChinaHefei 230026China Northwest Institute of Nuclear Technology Xi’an 710024China university of Chinese Academy of Sciences Beijing 100049China china Shipbuilding Trading Co. LtdBeijing 100044China

Neutron resonance imaging(NRI)has recently emerged as an appealing technique for neutron *** complexity surpasses that of conventional transmission imaging,as it requires a high demand for both a neutron source and ***,the progression of NRI technology has been sluggish since its inception in the 1980s,particularly considering the limited studies analyzing the neutron energy range above *** white neutron source(Back-n)at the china Spallation Neutron Source(CSNS)provides favorable beam conditions for the development of the NRI technique over a wide neutron energy range from eV to ***-sensitive microchannel plates(MCP)have emerged as a cutting-edge tool in the field of neutron detection owing to their high temporal and spatial resolutions,high detection efficiency,and low *** this study,we report the development of a 10B-doped MCP detector,along with its associated electronics,data processing system,and NRI experiments at the *** heavy elements such as gold,silver,tungsten,and indium can be easily identified in the transmission images by their characteristic resonance peaks in the 1–100 eV energy range;the more difficult medium-weight elements such as iron,copper,and aluminum with resonance peaks in the 1–100 keV energy range can also be *** particular,results in the neutron energy range of dozens of keV(Aluminum)are reported here for the first time.

关键词： Neutron resonance imaging 10B doped MCP detector White neutron source Sample nuclide identification

High temperatures do not decrease biocontrol potential for the host-killing parasitoid Neochrysocharis formosa(Hymenoptera:Eulophidae)on agromyzid leafminers

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Journal of Integrative Agriculture 2022年第6期21卷 1722-1730页

作者： XUAN Jing-li XIAO yue YE Fu-yu ZHANG Yi-bo tao Shu-xia {2. Jian-yang LIU Wan-xue state key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193P.R.China College of Agronomy Jilin Agricultural UniversityChangchun 130118P.R.China Department of Entomology and Plant Pathology North Carolina State UniversityRaleigh 27607USA

Temperature, as a critical abiotic factor, might influence the effectiveness of biological control by parasitoids in hostparasitoid systems. In this study, Neochrysocharis formosa(Westwood), a larval endoparasitoid, is used to investigate the efficacy of biological control on a vegetable agriculture pest, Liriomyza sativae Blanchard, reared on kidney bean(Phaseolus vulgaris L.), at four constant temperatures(2., 2., 32. and 35℃) under laboratory conditions. Our results show that high temperatures(2., 32. and 35℃) do not significantly affect lifetime host-killing events of female adults by increased daily host-killing events compared to temperature of 2.℃, although their lifespans decrease with an increase in temperatures. Each life-history trait of female adults(lifespan, parasitism, stinging, or non-reproductive host-killing events) present a linear relation with temperatures and host-feeding events, respectively. Our findings contribute to a better understanding of biocontrol efficacy of parasitoid N. formosa against agromyzid leafminers at high-temperature seasons or environments.

关键词： leaf-mining fly host-feeding parasitoid heat stress biological control

Structure, magnetic properties, and thermal stability of Sm(1-x)Tm_xCo_5compounds

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Rare Metals 2014年第2期33卷 176-179页

作者： Jian-Hua Zuo Ming yue Qing-Mei Lu Dong-tao Zhang Xue-Xu Gao Jiu-Xing Zhang Zhao-Hui {2. Wei Li College of Materials Science and Engineering Beijing University of Technology state key Laboratory of Advanced Metals and Materials University of Science and Technology Beijing Division of Functional Materials Central Iron and Steel Research Institute

Structure, magnetic properties, and thermal stability of ternary Sm1-xTmxCo5 compounds were studied via X-ray diffraction（XRD）, thermal magnetic analysis（TMA）, and magnetic measurements. XRD results show that all the compounds have a main phase of hexagonal CaCu5-type crystal structure with small amount of impurity phases; increasing Tm content is associated with contraction of the hexagonal unit cell in the direction of the c axis and expansion of the a and b parameters. TMA results indicate that the Curie temperature（TC） of Sm1-xTmxCo5 compounds gets higher with the increase in Tm *** measurements show that both the magnetic anisotropy field（HA） and the magnetization at an applied field of 7 T（M7 T） decrease with the increase of Tm content. However, the thermal stability of both the HAand M7 Tof all the Tm doped compounds is remarkably improved compared with that of the pure SmCo5 compound, leading to the result that both the M7 Tand HAof Sm0.8Tm0.2.o5 .2.re higher than those of SmCo5 compound at 473 K, which indicates the good potential of Tm doped compound in the practical applications at elevated temperature.

关键词： Sm1-xTmxCo5 compounds Crystal structure Intrinsic magnetic property Thermal stability

Optical and electronic anisotropy of a 2. semiconductor SiP

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Nano Research 2022年第9期15卷 8579-8586页

作者： Shijun Hou Zhengfeng guo tao Xiong Xingang Wang Juehan Yang {2.-Yang Liu Zhi-Chuan Niu Shiyuan Liu Bing Liu Shenqiang Zhai Honggang Gu Zhongming Wei state key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100083China state key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Joint Laboratory of Advanced Semiconductor Nanjing Guoke Semiconductor CO.Ltd.Nanjing 210008China

Two-dimensional anisotropic materials have been widely concerned by researchers because of their great application potential in the field of polarized detector devices and optical elements,which is a very important and popular research direction at *** a IV-V two-dimensional material,silicon phosphide(SiP)has obvious in-plane anisotropy and exhibits excellent optical and electrical anisotropy ***,the optical anisotropy of SiP is studied by spectrometric ellipsometry measurements and polarization-resolved optical microscopy,and its electrical anisotropy is tested by SiP-based field-effect *** addition,the normal and anisotropic photoelectric performance of SiP is shown by fabricating a photodetector and measuring *** various measurements,SiP exhibits obvious anisotropy and good photoelectric *** work provides basic optical,electrical,and photoelectric performance information of SiP,and lays a foundation for further study of SiP and applications of SiP-based devices.

关键词： two-dimensional materials SiP optical anisotropy electrical anisotropy photoelectronic properties

改进的VIM模型在建筑物区域地震脆弱性评估中的应用——以玉树地区为例

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灾害学 2024年第2期39卷 106-112页

作者：郑浩陈宇郭兰兰刘吉夫刘连友郑涛北京师范大学环境演变与自然灾害教育部重点实验室北京100875 北京师范大学地理科学学部北京100875 北京师范大学地表过程与资源生态国家重点实验室北京100875 中铁一局集团有限公司建筑安装工程分公司西安710054

快速和准确地评估建筑区域地震脆弱性,对把握区域尺度的地震风险和城市及周边地区的防震减灾工作具有重要意义。该文利用改进的脆弱性指数模型(VIM),在区域尺度上选取建筑物的修建时期、结构类型、建筑面积、楼层高度和建筑层数等7种属... 详细信息

快速和准确地评估建筑区域地震脆弱性,对把握区域尺度的地震风险和城市及周边地区的防震减灾工作具有重要意义。该文利用改进的脆弱性指数模型(VIM),在区域尺度上选取建筑物的修建时期、结构类型、建筑面积、楼层高度和建筑层数等7种属性作为修正指标,对玉树藏族自治州建筑物区域地震脆弱性曲线进行修正。并以2.10年4月14日的玉树7.1级地震为情景,对玉树地区建筑物区域地震脆弱性进行评估,并分析其分布规律和影响因素。研究表明,改进的VIM模型可以显著提高玉树地区建筑物区域地震脆弱性的评估结果(13%)。玉树地区建筑物区域地震脆弱性在空间上呈现出以震中结古镇为中心向四周辐射递减,和以甘孜—玉树断裂带为“脊线”向两侧递减的分布规律。

关键词：建筑物区域地震脆弱性脆弱性指数法地震灾害

全民所有自然资源资产清查实践的理论与关键技术体系探讨

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生态经济 2024年第4期40卷 151-158,184页

作者：李广泳郭晋洲陶舒周旭贾云鹏杜娟北京林业大学草业与草原学院北京100083 中华人民共和国自然资源部北京100812 国家基础地理信息中心北京100830

全民所有自然资源资产是我国国有资产的重要组成部分,保障国家社会经济可持续发展的基石。可靠的全民所有自然资源资产清查是摸清我国自然资源资产家底的有效途径,关系国家重大自然资源安全战略决策的正确性。论文结合全民所有自然资源... 详细信息

全民所有自然资源资产是我国国有资产的重要组成部分,保障国家社会经济可持续发展的基石。可靠的全民所有自然资源资产清查是摸清我国自然资源资产家底的有效途径,关系国家重大自然资源安全战略决策的正确性。论文结合全民所有自然资源资产清查工作实践,提出了资产清查的基本概念、理论支撑,设计了全民所有自然资源资产清查的总体技术体系框架。在此基础上,进一步总结了多源异构大数据整合、资产价格空间化构建、可靠性质量控制与核查、数据统计分析与挖掘、成果应用与辅助决策等关键技术,探讨了全民所有自然资源资产清查与自然资源监督管理工作的交织,以为常态化的全民所有自然资源资产清查工作提供科技支撑,更好地服务于我国现阶段的全民所有自然资源资产管理工作。

关键词：自然资源资产资产清查全民所有理论基础关键技术

不同产地丹参药材丹参酮类成分与土壤因子的相关性研究

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中国中药杂志 2024年第7期49卷 1793-1801页

作者：戴瑶瑶闫滨滨杨健章跃龙章君麒熊丰郭兰萍成都中医药大学药学院四川成都611137 中国中医科学院中药资源中心道地药材品质保障与资源持续利用全国重点实验室北京100700 德兴市中医研究院试验培训基地江西德兴334220 农业农村部中药材生物学与栽培重点实验室北京100700 宁波中盛产品检测有限公司浙江宁波315040

土壤养分和无机元素不仅影响药用植物的生长发育,同时也对中药活性成分的形成和积累具有较大影响。该研究对来自6个省18个主要产地的丹参药材的丹参酮类成分及2.种无机元素进行定量分析,并测定对应土壤的35种理化因子,对丹参药材无机元... 详细信息

土壤养分和无机元素不仅影响药用植物的生长发育,同时也对中药活性成分的形成和积累具有较大影响。该研究对来自6个省18个主要产地的丹参药材的丹参酮类成分及2.种无机元素进行定量分析,并测定对应土壤的35种理化因子,对丹参药材无机元素的富集特征进行分析。通过相关性分析和逐步回归分析,筛选出影响丹参药材中丹参酮类成分的主要土壤因子。研究结果表明,不同产地丹参药材中丹参酮成分含量具有显著差异,其中山东丹参的总丹参酮含量最高,其次为河南丹参,山西、四川产丹参药材的该类成分含量相对较低。不同产地丹参药材中无机元素钾(K)、镁(Mg)、钙(Ca)、钠(Na)的含量比较丰富,其中对Na、K的富集能力最强。根据相关性分析和回归分析结果表明,土壤K、Na、钛(Ti)、全氮为影响丹参药材中丹参酮类成分的主要土壤因子,其与土壤Ti呈正相关,与Na、K、全氮呈负相关。因此,在丹参种植过程中,选地时应当充分考虑其含盐量,避免盐碱地种植。其次,在肥料的使用上,可适量减少氮肥、钾肥的施用,并进一步针对性开发丹参水溶性元素肥料。

关键词：丹参无机元素丹参酮土壤相关分析

Digital core approach to the effects of clay on the electrical properties of saturated rocks using lattice gas automation

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Applied Geophysics 2011年第1期8卷 11-17,94页

作者： yue Wen-Zheng tao {2. Chai Xi-Yuan Cui Dong-Zi state key Laboratory of Petroleum {2. and prospecting Key Laboratory of Earth Prospecting and Information Technology CNPC Key Lab of Well Logging China University of Petroleum Beijing 102249 China Bohai Drilling Engineering Company LTD Logging Company Tianjin 300280 China Petrochina GWDC Drilling Technology Services Company Panjin 124010 China

Clay has a significant influence on the relationship between resistivity index I and water saturation Sw （i.e, I-Sw relationship） of reservoir rocks because it complicates the current paths of these rocks. It is difficult to reveal the physical mechanisms of these clay effects on the conductivities of various rocks by physical laboratory measurements because the pore structure, micro distribution and content of clay inside a rock can not be observed and controlled during the experiments. We present a digital rock approach to study these clay effects on the electrical transport properties of reservoir rocks at pore scale using lattice gas automation （LGA） method. The digital rock samples are constructed with the information of grain size distribution from SEM images of reservoir rocks. The LGA is then applied on these digital rocks fully saturated with fluids to simulate the electrical transport properties for revealing the effects of volume and distribution patterns of clay on the non-Archie behaviors of the I-Sw relationship. The very good agreement between the simulated results and the laboratory measurements clearly demonstrates the validity of the LGA in numerical research of rock physics. Based on these studies, a new model has been developed for quantitatively describing the relationship between the saturation exponent and the volume of clay （Vsh）. This development may improve the evaluation for the fluid saturations in reservoir rocks.

关键词： Lattice gas automation Digital rock non-Archie behavior of I-Sw relationship clay content

Wide-spectrum polarization-sensitive and fast-response photodetector based on 2. group Ⅳ-Ⅵ semiconductor tin selenide

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Fundamental Research 2022年第6期2卷 985-992页

作者： Yali Yu tao Xiong Zhengfeng guo Shijun Hou Juehan Yang {2.-Yang Liu Honggang Gu Zhongming Wei state key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronic Engineering University of Chinese Academy of SciencesBeijing 100049China state key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China

Tin selenide(SnSe)has attracted considerable interest recently on account of its low-symmetry lattice structure,great compatibility with key semiconductor technology,and remarkable electrical and optical ***-based polarization-sensitive photodetectors show promising application prospects because of their fast response and excellent photoelectric ***,an in-plane anisotropic SnSe nanosheet was synthesized and reported in detail by applying angle-resolved polarized Raman spectroscopy(ARPRS),polarization-resolved optical microscopy(PROM),angle-resolved optical absorption spectroscopy(AROAS),and other crystal structure characterization ***,SnSe crystals exhibit superior polarization detection performance with a high anisotropic photocurrent ratio(2.31 at 1064 nm)due to the structure formed by the Van der Waals superposition of covalently bonded atomic ***,SnSe-based photodetectors have high responsivity(9.2. A/W),high detectivity(4.08×10^(10)Jones),and fast response(in the order of nanoseconds).These results suggest a new method for fabricating 2. fast-response polarization-sensitive photodetectors in the future.

关键词： Layered SnSe In-plane anisotropy Polarization-sensitive photodetector Fast response Wide spectrum