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

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

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Effects of binary interactions on the color evolution of M33

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Science China(Physics,Mechanics & Astronomy) 2012年第8期55卷 1505-1509页

作者： kang XiaoYu ZHANG FengHui ZHANG Yu National Astronomical Observatories Yunnan Observatory Chinese Academy of Sciences Kunming 650011 China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of Sciences Kunming 650011 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

In this work, predictions of the spectral energy distribution from populations of single and binary stars are incorporated into a galactic chemical and color evolution model to explore the significance of the effects of the binary interactions on the color evolution of M33. We first constructed a model without binary interactions, and the model is able to reproduce most of the available observational constraints on the distribution of stellar parameters. We then run simulations with the same set of model parameters but with binary interactions considered. By comparing the results for the populations with and without binary interactions, we find that the inclusion of binary interactions makes the surface brightness greater (~0.1 mag arcsec 2) in FUV-band but smaller (~0.7 mag arcsec 2) in K-band, while it results in the FUV K color bluer (~0.8 mag). To reproduce the observations, a model that considers the binary interactions should make more gas fall onto the disk in the early time of the galaxy evolution, or increase the total stellar mass, or both.

关键词： M33 evolution binary stars

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An unforgettable debate between descriptive and experimental biology in the 1930s in China

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Protein & Cell 2010年第12期1卷 1053-1055页

作者： Ming Li Zonggang Hu Le kang Beijing Institutes of Life Science Chinese Academy of SciencesBeijing 100101China Lushan Botanical Garden Jiangxi Province and Chinese Academy of SciencesJiujiang 332900China

At the early 20th century,biological research was advancing with big steps,as new disciplines like genetics,development and metabolism had achieved tremendous success thanks to new experimental ***,China’s biological research,which did not exist in many senses before the 20th century,was also going through a prosperous period between the 1920s and 1937.

关键词： forget metabolism steps

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Polaronic Electron-Phonon Interactions on the Third-Harmonic Generation in a Square Quantum Well

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Communications in Theoretical Physics 2006年第1期45卷 171-174页

作者： LU Zhi-En GUO kang-Xian Department of Physics Faculty of Sciences Guihuagang Campus Guangzhou University Guangzhou 510405 China

The influence of electron-phonon interactions on third-harmonic generation in a square quantum well is investigated. The first- and third-harmonic generation coefficient is obtained by using compact-density-matrix approach and iterative method, and the numerical results are presented for a GaAs square quantum well. The results show that the third-harmonic generation coefficient is obviously enhanced after considering the influence of electron-phonon interactions.

关键词： electron-phonon interactions third-harmonic generation nonlinearity

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All-inorganic perovskite nanocrystal materials: new generation of scintillators for high quality X-ray imaging

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Science Bulletin 2019年第17期64卷 1205-1206页

作者： kang Wang Hao Zhang Zhanjun Gu Aerospace Institute of Advanced Materials & Processing Technology Beijing 100074 China bCAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety Institute of High Energy Physics and National Center for Nanoscience and Technology o f China Chinese Academy of Sciences Beijing 100049 China

Scintillating materials, which can convert high energy X-ray radiation into visible luminescence [1], are crucial parts of Xray imaging technology. Since the discovery of X-ray in 1895, scintillating materials have witnessed wild applications in various fields, including security inspection, space exploration, nondestructive detection, and medical diagnostics [2,3]- Conventional scintillators are generally large inorganic crystals and can only be grown at high temperature, which significantly increases the manufacturing difficulty and cost. The luminescence of current crystal scintillators is usually limited by lowefficiency or afterglow effects, and is difficult to be tuned cross the visible spectrum. As traditional scintillators have reached their performance limits, exploration of new scintillators has become a crucial topic considering the increased demands of X-ray imaging and detection technology [4-6].

关键词： space exploration visible spectrum high energy

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Improving the photocatalytic activity of graphitic carbon nitride by thermal treatment in a high-pressure hydrogen atmosphere

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Progress in Natural Science:Materials International 2018年第2期28卷 183-188页

作者： Xiangdong kang Yuyang kang Xingxing Hong Zhenhua Sun Chao Zhen Chaohao Hu Gang Liu Huiming Cheng Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Guangxi key Laboratory of Information Materials Guilin University of Electronic Technology School of Materials Science and Engineering University of Science and Technology of China Low-Dimensional Material and Device Laboratory Tsinghua-Berkeley Shenzhen Institute Tsinghua University Center of Excellence in Environmental Studies King Abdulaziz University

Extending visible light absorption range and suppressing the recombination of photogenerated charge carriers are always important topics in developing efficient solar-driven photocatalysts. In this study, the thermal treatment process at 400 °C in a high-pressure hydrogen atmosphere was applied to modify graphitic carbon nitride. Compared to the normal atmospheric hydrogen treatment process, this process has the merit of producing nitrogen deficient graphitic carbon nitride in high-yield. The optimal photocatalytic activity of modified graphitic carbon nitride was demonstrated by controlling the treatment duration in the hydrogen *** changes in the crystal structure, microstructure and optical properties of carbon nitrides were investigated by several characterizations. The relationship between the photocatalytic activity and structures of graphitic carbon nitride was preliminarily established. The results obtained in this study could provide some new ways of improving the activity of graphitic carbon nitride based photocatalyst.

关键词： Photocatalysis Carbon nitride High pressure Hydrogenation Visible light

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Effects of Ti, Al and Hf on niobium silcides formation in the Nb-Si in situ composites

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Science China(Technological Sciences) 2009年第1期52卷 37-40页

作者： QU ShiYu HAN YaFang kang YongWang Beijing Institute of Aeronautical Materials Beijing 100095China

The effects of alloying elements Ti, Al and Hf on niobium silicides formation in the Nb-Si in situ composites have been investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The binary, ternary and multicomponent alloys have been fabricated by vacuum non-consumable arc melting method. The results show that Ti tends to stabilize Nb3Si phase, while Al promotes the direct formation of β-Nb5Si3 phase with a tetrahedral D8m structure. Exceptionally, it seems that Hf is beneficial to the formation of γ-Nb5Si3 phase with a hexangular D88 structure. For the multicomponent Nb-Si in situ composites, the cooperative effects of different elements on niobium silicides formation basically maintain the character of ternary system.

关键词： Nb-Si in situ composites, silicide, microstructure

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Juvenile hormone signaling-a mini review

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Insect Science 2019年第4期26卷 600-606页

作者： kang Li Qiang-Qiang Jia Sheng Li Guangzhou Key Laboratory of Insect Development Regulation and Application Research Institute of Insect Science and Technology&School of Life SciencesSouth China Normal UniversityGuangzhouChina

Since it was first postulated by Wigglesworth in 1934, juvenile hormone (JH) is considered a status quo hormone in insects because it prevents metamorphosis that is initiated by the molting hormone 20-hydroxyecdysone (20E). During the last decade, significant advances have been made regarding JH signaling. First, the bHLH-PAS transcription factor Met/Gce was identified as the JH intracellular receptor. In the presence of JH, with the assistance of Hsp83, and through physical association with a bHLH?PAS transcriptional co-activator, Met/Gce enters the nucleus and binds to E-box-like motifs in promoter regions of JH primary?response genes for inducing gene expression. Second, the zinc finger transcription factor Kr-hl was identified as the anti-metamorphic factor which transduces JH signaling. Via Kr-hl binding sites, Kr-hl represses expression of 20E primary?response genes (i.e. Bi\ E93 and E5) to prevent 20E-induced metamorphosis. Third, through the intracellular signaling, JH promotes differ ent aspects of female reproduction. Nevertheless, this action varies greatly from species to species. Last, a hypothetical JH membrane receptor has been predicted to be either a GPCR or a tyrosine kinase receptor. In future, it will be a great challenge to understand how the JH intracellular receptor Met/Gce and the yet unidentified JH membrane receptor coordinate to regulate metamorphosis and reproduction in insects.

关键词： intracellular receptor juvenile hormone (JH) Kr-h 1 membrane receptor Met/Gce metamorphosis reproduction

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Simulation of the Diffusion in Laser Induced Chain Reaction of 1,2-Dichloroethane

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Chinese Physics Letters 1991年第2期8卷 106-109页

作者： kang Jin WANG Lixin XU Jiren Institute of Physics Academia SinicaBeijing 100080

A system of diffusion equations of laser induced chain reaction of 1,2-dichloroethane to form vinyl chloride is *** means of finite differential method,a temporal radial concentration distribution for the product viny... 详细信息

关键词： ethane 1,2 vinyl

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CREEP FRACTURE OF INTERMETALLIC COMPOUND(Fe60Ni40)3(V98Ti2)

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Acta Metallurgica Sinica(English Letters) 1992年第1期5 A卷 62-65页

作者： Yao Xuexing kang Feiyu Chen Nanping Tsinghua Univ Beijing China

The creep fracture behavior of intermetallic compound(FeNi)(VTi)has been *** variation of dislocation substructure was observed with TEM in the process ofsteady-state *** is found that there exists a large amount of stacking faults,dislocationpairs and also high density dislocation *** analysis of section near fracture sur-face points out that the intergranular crack due to coalescence of small cavities is the maincreep fracture mechanism of(FeNi)(VTi).

关键词： intermetallic compound (Fe60Ni40)3(V98Ti2) creep fracture

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