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Simulation and experimental comparison of the performance of four-corner-readout plastic scintillator muon-detector system

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Nuclear Science and Techniques 2024年第11期35卷 1-12页

作者： Lie He Si-Yuan Luo Xiang-Man Liu Yu-cheng Zou Hai-Feng Zhang wan-cheng xiao Yu-He Huang xiao-Dong wang School of Nuclear Science and Technology University of South ChinaHengyang 421001China Key Laboratory of Advanced Nuclear Energy Design and Safety(MOE) University of South ChinaHengyang 421001China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China School of Physical Sciences University of Science and Technology of ChinaHefei 230026China

Cosmic-ray muons are highly penetrating background-radiation particles found in natural *** this study,we develop and test a plastic scintillator muon detector based on machine-learning *** detector underwent muon position-resolution tests at the Institute of Modern Physics in Lanzhou using a multiwire drift chamber(MWDC)experimental *** the simulation,the same structural and performance parameters were maintained to ensure the reliability of the simulation *** Gaussian process regression(GPR)algorithm was used as the position-reconstruction algorithm owing to its optimal *** results of the Time Difference of Arrival algorithm were incorporated as one of the features of the GPR model to reconstruct the muon hit *** accuracy of the position reconstruction was evaluated by comparing the experimental results with Geant4 simulation *** the simulation,large-area plastic scintillator detectors achieved a position resolution better than 20 *** the experimental-platform tests,the position resolutions of the test detectors were 27.9 *** also analyzed factors affecting the position resolution,including the critical angle of the total internal reflection of the photomultiplier tubes and distribution of muons in the *** were performed to image both large objects and objects with different atomic *** results showed that the system could image high-and low-Z materials in the constructed model and distinguish objects with significant density *** study demonstrates the feasibility of the proposed system,thereby providing a new detector system for muon-imaging applications.

关键词： Monte Carlo simulation Muon tomography TDOA Machine learning Image reconstruction

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Hybrid model for muon tomography and quantitative analysis of image quality

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Nuclear Science and Techniques 2022年第7期33卷 1-13页

作者： Si-Yuan Luo Yu-He Huang Xuan-Tao Ji Lie He wan-cheng xiao Feng-Jiao Luo Song Feng Min xiao xiao-Dong wang School of Nuclear Science and Technology University of South ChinaHengyang 421001China

Muon tomography is a novel method for the non-destructive imaging of materials based on muon rays,which are highly penetrating in natural background ***,the most commonly used imaging methods include muon radiography and muon tomography.A previously studied method known as coinciding muon trajectory density tomography,which utilizes muonic secondary particles,is proposed to image low and medium atomic number(Z)***,scattering tomography is mostly used to image high-Z materials,and coinciding muon trajectory density tomography exhibits a hollow phenomenon in the imaging results owing to the self-absorption *** address the shortcomings of the individual imaging methods,hybrid model tomography combining scattering tomography and coinciding muon trajectory density tomography is proposed and *** addition,the peak signal-to-noise ratio was introduced to quantitatively analyze the image *** imaging models were simulated using the Geant4 toolkit to confirm the advantages of this innovative *** simulation results showed that hybrid model tomography can image centimeter-scale materials with low,medium,and high Z *** high-Z materials with similar atomic numbers,this method can clearly distinguish those with apparent differences in *** to the peak signal-to-noise ratio of the analysis,the reconstructed image quality of the new method was significantly higher than that of the individual imaging *** study provides a reliable approach to the compatibility of scattering tomography and coinciding muon trajectory density tomography.

关键词： Monte Carlo simulation Muon tomography Image reconstruction

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Study on Microwave Dielectric Property of Carbon Black and Short Carbon Fibers

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Chinese Journal of Aeronautics 2006年第B12期19卷 130-133页

作者： WUHong-huan ZHU Dong-mei LUO Fa ZHOU wan-cheng wanG xiao-yan State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi＇an 710072 China

Carbon black and carbon fibers of different lengths were introduced in different matrices at different ratios to explore their microwave dielectric properties under 8.2 GHz-12.4 GHz. It is found that the actual dielectric constants of the samples containing carbon black are in a two-order function of the contents of carbon black （ε＇, ε＂=Av2＋Bv＋C） and the complex dielectric constants show an obvious frequency response. Of the added fibers of different lengths, the 4 mm-long one could well disperse in the matrices having not only good frequency response, but also larger real parts, imaginary parts and loss values. The imaginary parts and the loss values （tanδ）of the samples with 4 mm-long carbon fibers added increase linearly with the contents of fiber increasing. So it is practicable to adjust the dielectric parameters of the material in a wide range by changing the added amount of carbon black, and the carbon fiber or altering the lengths of the carbon fiber added.

关键词： microwave dielectric property short carbon fibers carbon black

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Observation of topological charge transformations in acoustic vortex using passive periodic systems

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 140-147页

作者： Di-Chao Chen Xie Liu Changqing Xu Da-Jian Wu Ying cheng xiao-Jun Liu School of Physics and Technology Nanjing Normal University Key Laboratory of Modern Acoustics School of Physics Nanjing University

Vortex transmutation utilizes a periodic system, which not only enables the alteration of the topological charge(TC) of unstable input vortices but also facilitates their transformation into stable structures. This approach is crucial for investigating the characteristics of vortices in various wave systems. Here, we achieve acoustic vortex TC transmutation by employing a welldesigned dual-structured plate external system(DPES). The interactions between the acoustic vortex and the finite-order discrete rotational symmetry lead to the transformation of its topological charge when complete rotational symmetry is broken to Nthorder discrete symmetry. Our results experimentally demonstrate the acoustic vortex TC transmutation based on passive artificial structures, enabling numerous applications in particle manipulation and information multiplexing as well as advancing our understanding and control over free-space acoustic vortices.

关键词： acoustic vortex topological charge transformation artificial structure

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Spontaneous Orientation Polarization of Anisotropic Equivalent Dipoles Harnessed by Entropy Engineering for Ultra‑Thin Electromagnetic Wave Absorber

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Nano-Micro Letters 2025年第1期17卷 424-438页

作者： Honghan wang Xinyu xiao Shangru Zhai Chuang Xue Guangping Zheng Deqing Zhang Renchao Che Junye cheng Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials Liaoning Collaborative Innovation Center for Lignocellulosic BiorefinerySchool of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034People’s Republic of China School of Life Science and Biotechnology Dalian University of TechnologyDalian 116024People’s Republic of China Department of Mechanical Engineering Hong Kong Polytechnic UniversityHung HomKowloonHong Kong 999077People’s Republic of China School of Materials Science and Engineering Qiqihar UniversityQiqihar 161006People’s Republic of China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438People’s Republic of China Department of Materials Science Shenzhen MSU-BIT UniversityShenzhen 517182People’s Republic of China

The synthesis of carbon supporter/nanoscale high-entropy alloys(HEAs)electromagnetic response composites by carbothermal shock method has been identified as an advanced strategy for the collaborative competition engineering of conductive/dielectric *** migration modes within HEAs as manipulated by the electronegativity,valence electron configurations and molar proportions of constituent elements determine the steady state and efficiency of equivalent ***,enlightened by skin-like effect,a reformative carbothermal shock method using carbonized cellulose paper(CCP)as carbon supporter is used to preserve the oxygencontaining functional groups(O·)of carbonized cellulose fibers(CCF).Nucleation of HEAs and construction of emblematic shell-core CCF/HEAs heterointerfaces are inextricably linked to carbon metabolism induced by O·.Meanwhile,the electron migration mode of switchable electronrich sites promotes the orientation polarization of anisotropic equivalent *** virtue of the reinforcement strategy,CCP/HEAs composite prepared by 35%molar ratio of Mn element(CCP/HEAs-Mn_(2.15))achieves efficient electromagnetic wave(EMW)absorption of−51.35 dB at an ultra-thin thickness of 1.03 *** mechanisms of the resulting dielectric properties of HEAs-based EMW absorbing materials are elucidated by combining theoretical calculations with experimental characterizations,which provide theoretical bases and feasible strategies for the simulation and practical application of electromagnetic functional devices(e.g.,ultra-wideband bandpass filter).

关键词： High-entropy alloys Carbothermal shock Switchable electron migration modes Emblematic shell-core heterointerfaces Ultra-thin thickness

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Mutual regulation of microglia and astrocytes after Gas6 inhibits spinal cord injury

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Neural Regeneration Research 2025年第2期20卷 557-573页

作者： Jiewen Chen xiaolin Zeng Le wang Wenwu Zhang Gang Li Xing cheng Peiqiang Su Yong wan Xiang Li Department of Spine Surgery The First Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdong ProvinceChina Guangdong Province Key Laboratory of Orthopedics and Traumatology GuangzhouGuangdong ProvinceChina

Invasive inflammation and excessive scar formation are the main reasons for the difficulty in repairing nervous tissue after spinal cord *** and astrocytes play key roles in the spinal cord injury micro-environment and share a close ***,the mechanisms involved remain *** this study,we found that after spinal cord injury,resting microglia(M0)were polarized into pro-inflammatory phenotypes(MG1 and MG3),while resting astrocytes were polarized into reactive and scar-forming *** expression of growth arrest-specific 6(Gas6)and its receptor Axl were significantly down-regulated in microglia and astrocytes after spinal cord *** vitro experiments showed that Gas6 had negative effects on the polarization of reactive astrocytes and pro-inflammatory microglia,and even inhibited the cross-regulation between *** further demonstrated that Gas6 can inhibit the polarization of reactive astrocytes by suppressing the activation of the Yes-associated protein signaling ***,in turn,inhibited the polarization of pro-inflammatory microglia by suppressing the activation of the nuclear factor-κB/p65 and Janus kinase/signal transducer and activator of transcription signaling *** vivo experiments showed that Gas6 inhibited the polarization of pro-inflammatory microglia and reactive astrocytes in the injured spinal cord,thereby promoting tissue repair and motor function ***,Gas6 may play a role in the treatment of spinal cord *** can inhibit the inflammatory pathway of microglia and polarization of astrocytes,attenuate the interaction between microglia and astrocytes in the inflammatory microenvironment,and thereby alleviate local inflammation and reduce scar formation in the spinal cord.

关键词： astrocytes Axl cell polarization Gas6 Hippo signal inflammatory micro-environment intercellular interaction microglia single-cell sequencing spinal cord injury

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肺、脾、肾三脏同治缓解期支气管哮喘50例临床观察

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广东医学院学报 2016年第2期34卷 194-196页

作者：万诚肖波广东省湛江市第三人民医院广东湛江524012 广东省湛江市第二中医医院广东湛江524013

目的观察缓解期支气管哮喘行肺脾肾三脏同治的疗效。方法 100例缓解期支气管哮喘患者随机分为对照组和观察组。对照组常规吸入小剂量糖皮质激素50～100μg,每天2次;观察组给予玉屏风散＋六君子汤＋肾四味组方,每4 d口服1剂。两组的疗程... 详细信息

目的观察缓解期支气管哮喘行肺脾肾三脏同治的疗效。方法 100例缓解期支气管哮喘患者随机分为对照组和观察组。对照组常规吸入小剂量糖皮质激素50～100μg,每天2次;观察组给予玉屏风散＋六君子汤＋肾四味组方,每4 d口服1剂。两组的疗程均为1 a。比较治疗后1 a内呼吸道感染次数、哮喘发作次数、哮喘急性发作持续时间。结果治疗后1 a内,两组患者的呼吸道感染和哮喘发作次数均较治疗前明显减少,哮喘急性发作持续时间均较治疗前缩短,且以观察组更为显著（P〈0.01）。结论肺、脾、肾三脏同治对缓解期支气管哮喘具有良好疗效。

关键词：支气管哮喘哮喘发作中药

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监护人责任的实体法与程序法问题

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北京理工大学学报(社会科学版) 2025年第1期27卷 21-34页

作者：程啸清华大学　法学院北京100084

监护人责任属于替代责任。监护人是侵权责任的主体，应当直接向被侵权人承担全部的侵权责任，而非相应的责任或补充责任。《民法典》第1188条第2款要求从有财产的被监护人的财产中支付赔偿费用，不足的部分才由监护人赔偿，该规定过于... 详细信息

监护人责任属于替代责任。监护人是侵权责任的主体，应当直接向被侵权人承担全部的侵权责任，而非相应的责任或补充责任。《民法典》第1188条第2款要求从有财产的被监护人的财产中支付赔偿费用，不足的部分才由监护人赔偿，该规定过于保护被侵权人以及监护人，忽视对被监护人的保护。父母作为未成年子女的法定监护人应当共同承担监护人责任即承担的是连带责任。离异夫妻中未与未成年人子女共同生活的一方也应当承担全部的监护人责任。没有与继子女形成抚养教育关系的继父母不承担监护人责任。继父母收养继子女后，应当承担监护人责任，被监护人的生父母不再承担监护人责任。教唆人、帮助人的侵权责任与未尽到监护职责的监护人承担的相应的责任以及监护人与有过错的受托履行监护职责的人所承担的侵权责任的关系都属于部分的连带责任。在监护人责任诉讼中监护人与被监护人属于共同被告。

关键词：民法典监护人责任补充责任相应的责任部分连带责任

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Numerical simulations of multi-layer-liquid sloshing by multiphase MPS method

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Journal of Hydrodynamics 2021年第5期33卷 938-949页

作者： xiao Wen Wei-wen Zhao De-cheng wan Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

In this paper,a multiphase moving particle semi-implicit(MPS)method is developed by introduction of various multiphase models into the original MPS method for single-phase flows,and is then applied to the numerical simulations of two-layer-liquid and three-layer-liquid sloshing in a 2-D rectangular tank under different external *** validate the accuracy of the present multiphase MPS method,the qualitative and quantitative results,including wave profiles,interface elevations and impact pressures,are compared with experimental data and other numerical results,which show a good *** particular,the evolutions of free surface and phase interfaces are compared and an obvious discrepancy is found,indicating that the phase interfaces may suffer from complex deformations while the free surface keeps relatively ***,the different modes of phase interface are observed under different excitation ***,the violent sloshing of a three-layer-liquid system is simulated and the phenomenon of internal wave breaking is well captured,which mainly benefitted from the Lagrangian basis of MPS method and its advantage in multiphase flows with complex ***,the three-layer-liquid sloshing with a vertical baffle are simulated to investigate the suppressing effect of baffle on multi-layer-liquid sloshing.

关键词： Moving particle semi-implicit(MPS) multiphase flows multi-layer-liquid liquid sloshing

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Research progress on the hydrodynamic performance of water-air-bubble mixed flows around a ship

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Journal of Hydrodynamics 2022年第2期34卷 171-188页

作者： Zheng Li xiao-song Zhang De-cheng wan Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The interaction between ship and surrounding fluids generates the water-air-bubble mixed flow laden with numerous droplets and *** water-air-bubble mixed flow is a complex multi-phase flow phenomenon,which involves intense air-water mixture,complex evolution of interface shape,interactions between multi-scale flow structures and strong turbulent *** on the field observations at sea,a large range of white water-air-bubble flow exists widely around a large-scale sailing ship,and directly affects the hydrodynamic performance of ship from various *** paper reviews the research progress of water-air-bubble mixed flow around a *** knowledge about the formation and evolution mechanism are introduced ***,the effects of the water-air-bubble mixed flow on ship performance are further reviewed,the main concerns are ship resistance,propulsion performance,slamming and ***,the future research prospects are summarized.

关键词： Water-air-bubble mixed flow ship resistance propulsion performance ship slamming characteristics maneuverability

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