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Nuclear Science and Techniques 2021年第8期32卷 95-109页

作者： Ming Dai mao-song cheng Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China CAS Innovative Academies in TMSR Energy System Chinese Academy of SciencesShanghai 201800China

The algebraic collapsing acceleration(ACA)technique maximizes the use of geometric flexibility of the method of characteristics(MOC).The spatial grids for loworder ACA are the same as the high-order transport,which makes the numerical solution of ACA equations costly,especially for large-size *** speed-up the MOC transport iterations effectively for general geometry,a coarse-mesh ACA method that involves selectively merging fine-mesh cells with identical materials,called material-mesh ACA(MMACA),is *** energy group batching(EGB)strategy in the tracing process is proposed to increase the parallel efficiency for microscopic crosssection *** and macroscopic crosssection benchmark problems are used to validate and analyse the accuracy and efficiency of the MMACA *** maximum errors in the multiplication factor and pin power distributions are from the VERA-4 B-2 D case with silver-indium-cadmium(AIC)control rods inserted and are 104 pcm and 1.97%,*** with the single-thread ACA solution,the maximum speed-up ratio reached 25 on 12 CPU cores for microscopic cross-section VERA-4-2 D *** the C5 G7-2 D and LRA-2 D benchmarks,the MMACA method can reduce the computation time by approximately one *** present work proposes the MMACA method and demonstrates its ability to effectively accelerate MOC transport iterations.

关键词： Algebraic collapsing acceleration Material-mesh ACA Method of characteristics OpenMP Arbitrary geometry

Development of a MCNP5 and ORIGEN2 based burnup code for molten salt reactor

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Nuclear Science and Techniques 2016年第3期27卷 108-114页

作者： Guo-Min Sun mao-song cheng Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

The Molten Salt Reactor(MSR) is one of the six advanced reactor nuclear energy systems for further research and development selected by Generation IV International Forum(GIF),which is distinguished by its core in which the fuel is dissolved in molten fluoride *** fuel flow in the primary loop,the depletion of MSR is different from that of solid-fuel *** this paper,an MCNP5 and ORIGEN2 Coupled Burnup(MOCBurn) code for MSR is developed under the MATLAB *** new methods and novel arrangements are used to make it suitable for fuel flow in the *** consider the fuel convection and diffusion in the primary loop of MSR,fuel mixing calculation is carried out after each burnup time *** function for geometry with repeat structures is implicated for reactor analysis with complex *** for a high-burnup reactor pin cell benchmark is performed using the MOCBurn *** of depletion study show that the MOCBurn code is suitable for the traditional solid-fuel reactors.A preliminary study of the fuel mixture effect in MSR is also carried out.

关键词：程序开发高燃耗熔盐堆 MATLAB平台先进反应堆固体燃料重复结构 MSR

Feasibility of an innovative long-life molten chloride-cooled reactor

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Nuclear Science and Techniques 2020年第4期31卷 1-15页

作者： Ming Lin mao-song cheng Zhi-Min Dai Shanghai Institute of Applied Physics Chinese Academy of SciencesJiading CampusShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

Molten salt-cooled reactor is one of the six GenIV reactors with promising characteristics including safety,reliability,proliferation resistance,physical protection,economics,and *** this paper,a small innovative molten chloride-cooled fast reactor(MCCFR)with 30-year core and a target 120-MWt thermal power was *** its feasible study,neutronics,thermal-hydraulics,and radiation damage analysis were *** key design properties including kinetics parameters,reactivity swing,reactivity feedback coefficients,maximum accumulated displacement per atom(DPA)of reactor pressure vessel(RPV)and fuel cladding,and maximum coolant,cladding,and fuel temperatures were *** results showed the MCCFR could operate without refueling for 30 years with overall negative reactivity feedback coefficients up the end of its *** its 30-year life,the excess reactivity was well managed by constantly pulling out the control *** maximum accumulated DPA on RPV and fuel cladding were 8.92 dpa and 197.03 dpa,respectively,which are both below the design ***,the maximum coolant,cladding and fuel center temperatures were all below the design limits during its entire *** to these results,the MCCFR core design with long life is feasible.

关键词： Molten salt-cooled reactor Neutronics Radiation damage Thermal-hydraulics

Flow field effect of delayed neutron precursors in liquid-fueled molten salt reactors

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Nuclear Science and Techniques 2022年第8期33卷 16-32页

作者： Xian-Di Zuo mao-song cheng Yu-Qing Dai Kai-cheng Yu Zhi-Min Dai Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

In molten salt reactors(MSRs),the liquid fuel salt circulates through the primary loop and a part of the delayed neutron precursors(DNPs)decays outside the reactor *** model and analyze the flow field effect of DNPs in channel-type liquid-fueled MSRs,a three-dimensional space-time dynamics code,named ThorCORE3D,that couples neutronics,core thermalhydraulics,and a molten salt loop system was developed and validated with the Molten Salt Reactor Experiment(MSRE)*** effects of external loop recirculation time,fuel flow rate,and core flow field distribution on the delayed neutron fraction loss of MSRE at steadystate were modeled and simulated using the ThorCORE3D ***,the flow field effect of the DNPs on the system responses of the MSRE in the reactivity insertion transient under different initial conditions was analyzed systematically for the channel-type liquid-fueled *** results indicate that the flow field condition has a significant effect on the steady-state delayed neutron fractions and will further affect the transient power and temperature responses of the reactor *** analysis results for the effect of the DNP flow field can provide important references for the design optimization and safety analysis of liquid-fueled MSRs.

关键词： Molten salt reactor Delayed neutron precursor Nodal expansion method Coupled neutronics and thermal-hydraulics

A multithreaded parallel upwind sweep algorithm for the S_(N) transport equations discretized with discontinuous finite elements

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Nuclear Science and Techniques 2023年第12期34卷 229-241页

作者： Zhi‑Wei Zong mao‑song cheng Ying‑Chi Yu Zhi‑Min Dai Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

The complex structure and strong heterogeneity of advanced nuclear reactor systems pose challenges for high-fidelity neutron-shielding calculations. Unstructured meshes exhibit strong geometric adaptability and can overcome the deficiencies of conventionally structured meshes in complex geometry modeling. A multithreaded parallel upwind sweep algorithm for S_(N) transport was proposed to achieve a more accurate geometric description and improve the computational efficiency. The spatial variables were discretized using the standard discontinuous Galerkin finite-element method. The angular flux transmission between neighboring meshes was handled using an upwind scheme. In addition, a combination of a mesh transport sweep and angular iterations was realized using a multithreaded parallel technique. The algorithm was implemented in the 2D/3D S_(N) transport code ThorSNIPE, and numerical evaluations were conducted using three typical benchmark problems:IAEA, Kobayashi-3i, and VENUS-3. These numerical results indicate that the multithreaded parallel upwind sweep algorithm can achieve high computational efficiency. ThorSNIPE, with a multithreaded parallel upwind sweep algorithm, has good reliability, stability, and high efficiency, making it suitable for complex shielding calculations.

关键词： Shielding calculation Discrete ordinates method Discontinuous Galerkin finite element method Unstructured meshes

Pulse-shaping method for real-time neutron/gamma discrimination at low sampling rates

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Nuclear Science and Techniques 2023年第11期34卷 51-63页

作者： Jia‑Xin Li Hui‑Liang Hou Yue‑Feng Huang mao‑song cheng Zhi‑Min Dai Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

The Na I:Tl scintillator is an innovative material for dual-gamma-ray and neutron detection with a low ^(6)Li *** achieve real-time n/γ discrimination,a zero-crossing time comparison algorithm based on trapezoidal pulse shaping was *** algorithm can operate efficiently at low sampling rates and was implemented on a single-probe portable digital n/γ discriminator based on a field-programmable gate *** discriminator and Na I:Tl,^(6)Li detector were tested in a neutron-gamma mixed field produced by an ^(241)Am-Be neutron source to evaluate the performance of the *** figure of merits was measured as 2.88 at a sampling rate of 50 MHz,indicating that the discriminator with its embedded algorithm has a promising n/γ discrimination *** discrimination at sampling rates of 40 and 25 MHz demonstrates that the capability of this method is not limited by low sampling rates.

关键词： FPGA NaI:Tl ^(6)Li Real time Neutron/gamma discrimination Pulse shaping

Development and Verification of a System Dynamic Model for Liquid-Fueled Molten Salt Reactor Based on Modelica

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Development and Verification of a System Dynamic Model for L...

采用一级强化处理+曝气生物滤池工艺的污水处理工程

作者： Shi-chao CHEN mao-song cheng Zhi-min DAI Shanghai Institute of Applied Physics Chinese Academy of SciencesJiading Campus University of Chinese Academy of Sciences

The liquid-fueled molten salt reactor uses liquid fuel, and its dynamic characteristics are different from the traditional solid fuel reactor. Dynamic modeling and simulation play a key role in the design phase of the innovative reactor system. Based on Modelica language, a Modelica model named TMSRLib（Thorium-based Molten Salt Reactor Library） for dynamic modeling and simulation of liquid-fueled molten salt reactor system is developed using Dymola platform. In order to verify the validity of the developed dynamic simulation model library, two system models of the MSRE（molten salt reactor experiment） with core represented by single region and nine regions are built based on the TMSRLib Modelica library, respectively. Then the two system models of the MSRE are validated by using experimental benchmarks of MSRE. The results show that the numerical results are in good agreement with MSRE experimental results, and verifies the applicability and correctness of each component model in TMSRLib.

关键词： Modelica Liquid-fueled molten salt reactor System dynamic model MSRE

来源： cnki会议评论

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中国给水排水 2006年第22期22卷 72-74页

作者：杨波杨志恒胡文容宋茂诚山东大学环境科学与工程技术研究中心山东济南250061 南京大学城市与资源学系江苏南京210093 济南十方圆通水务有限公司山东济南250101

介绍了受污染的济南玉绣河采用一级强化处理+曝气生物滤池为主体工艺进行处理的工程实例,运行结果表明,出水水质达到《城市污水再生利用景观环境用水水质标准》(GB/T18921—2002),并全部回用于景观用水和绿化用水,环境及经济效益明显。

关键词：一级强化处理曝气生物滤池景观环境用水

Hydrogen sulfide reduces oxidative stress in Huntington's disease via Nrf2

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Neural Regeneration Research 2025年第6期20卷 1776-1788页

作者： Zige Jiang Dexiang Liu Tingting Li chengcheng Gai Danqing Xin Yijing Zhao Yan song Yahong cheng Tong Li Zhen Wang Department of Physiology School of Basic Medical SciencesCheeloo College of MedicineShandong UniversityJinanShandong ProvinceChina Department of Medical Psychology and Ethics School of Basic Medicine SciencesCheeloo College of MedicineShandong UniversityJinanShandong ProvinceChina Department of Neurosurgery Surgery Qingdao Municipal HospitalQingdaoShandong ProvinceChina

The pathophysiology of Huntington's disease involves high levels of the neurotoxin quinolinic acid. Quinolinic acid accumulation results in oxidative stress, which leads to neurotoxicity. However, the molecular and cellular mechanisms by which quinolinic acid contributes to Huntington's disease pathology remain unknown. In this study, we established in vitro and in vivo models of Huntington's disease by administering quinolinic acid to the PC12 neuronal cell line and the striatum of mice, respectively. We observed a decrease in the levels of hydrogen sulfide in both PC12 cells and mouse serum, which was accompanied by down-regulation of cystathionine β-synthase, an enzyme responsible for hydrogen sulfide production. However, treatment with NaHS(a hydrogen sulfide donor) increased hydrogen sulfide levels in the neurons and in mouse serum, as well as cystathionine β-synthase expression in the neurons and the mouse striatum, while also improving oxidative imbalance and mitochondrial dysfunction in PC12 cells and the mouse striatum. These beneficial effects correlated with upregulation of nuclear factor erythroid 2-related factor 2 expression. Finally, treatment with the nuclear factor erythroid 2-related factor 2inhibitor ML385 reversed the beneficial impact of exogenous hydrogen sulfide on quinolinic acid-induced oxidative stress. Taken together, our findings show that hydrogen sulfide reduces oxidative stress in Huntington's disease by activating nuclear factor erythroid 2-related factor 2,suggesting that hydrogen sulfide is a novel neuroprotective drug candidate for treating patients with Huntington's disease.

关键词： apoptosis cystathionine-β-synthase nuclear factor erythroid 2-related factor 2 Huntington's disease hydrogen sulfide mitochondrion neuroplasticity oxidative stress quinolinic acid reactive oxygen species

Unequal clustering algorithm for WSN based on fuzzy logic and improved ACO

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The Journal of China Universities of Posts and Telecommunications 2011年第6期18卷 89-97页

作者： mao song ZHAO cheng-lin Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China Wireless Network Lab Beijing University of Posts and Telecommunications Beijing 100876 China

This paper proposes a novel energy efficient unequal clustering algorithm for large scale wireless sensor network （WSN） which aims to balance the node power consumption and prolong the network lifetime as long as possible. Our approach focuses on energy efficient unequal clustering scheme and inter-cluster routing protocol. On the one hand, considering each node＇s local information such as energy level, distance to base station and local density, we use fuzzy logic system to determine one node＇s chance of becoming cluster head and hand, adaptive max-min ant colony optimization is used to estimate the corresponding competence radius. On the other construct energy-aware inter-cluster routing between cluster heads and base station （BS）, which balances the energy consumption of cluster heads and alleviates the hot spots problem that occurs in multi-hop WSN routing protocol to a large extent. The confirmation experiment results have indicated the proposed clustering algorithm has more superior performance than other methods such as low energy adaptive clustering hierarchy （LEACH） and energy efficient unequal clustering （EEUC）.

关键词： WSN unequal clustering fuzzy logic adaptive max-min ant colony optimization (ACO) network lifetime