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Development and verification of the higher-order mode neutron flux calculation code HARMONY2.0

nuclear Science and Techniques 2025年第1期36卷 207-225页

作者： Er-Pin Zhang Zi-Ning Ni Nian-Biao Deng Jin-Sen Xie Yong Liu Tao Yu School of nuclear Science and Technology University of South ChinaHengyang 421000China Key Laboratory of Advanced nuclear Energy Design and Safety Ministry of EducationHengyang 421000China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610213China

Higher-order modes of the neutron diffusion/transport equation can be used to study the temporal behavior of nuclear reactors and can be applied in modal analysis, transient analysis, and online monitoring of the reactor core. Both the deterministic method and the Monte Carlo(MC) method can be used to solve the higher-order modes. However, MC method, compared to the deterministic method, faces challenges in terms of computational efficiency and α mode calculation stability, whereas the deterministic method encounters issues arising from homogenization-related geometric and energy spectra *** on the higher-order mode diffusion calculation code HARMONY, we developed a new higher-order mode calculation code, HARMONY2.0, which retains the functionality of computing λ and α higher-order modes from HARMONY1.0, but enhances the ability to treat complex geometries and arbitrary energy spectra using the MC-deterministic hybrid two-step strategy. In HARMONY2.0, the mesh homogenized multigroup constants were obtained using OpenMC in the first step,and higher-order modes were then calculated with the mesh homogenized core diffusion model using the implicitly restarted Arnoldi method(IRAM), which was also adopted in the HARMONY1.0 code. In addition, to improve the calculation efficiency, particularly in large higher-order modes, event-driven parallelization/domain decomposition methods are embedded in the HARMONY2.0 code to accelerate the inner iteration of λ∕α mode using OpenMP. Furthermore, the higher-order modes of complex geometric models, such as Hoogenboom and ATR reactors for λ mode and the MUSE-4 experiment facility for the prompt α mode, were computed using diffusion theory.

关键词： Neutron diffusion equation Higher-order modes Global homogenization Two-step method Domain

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A Catastrophe Mathematical Model for Uranium Mineralization of Hot-water Origin

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Acta Geochimica 1984年第4期3卷 396-406页

作者：戴杰敏陶代廉 Geological Brigade No.209 Yunnan Geological Bureau ministry of nuclear In dustry ministry ot nuclear in dustry

Presented in this paper are some primary data on the temperature,stratigraphical altitudeand thickness of a certain uranium ore *** these data as the parameters for the tem-perature,pressure and geochemical conditions of uranium mineralization under ideal geologicalconditions which constitute a finite variable series,in conjunction with the catastrophe theorydeveloped by Rene Thom (1968),we have proposed a swallow-tail model fit to uranium *** model provides insight into the mechanism of uranium *** study shows that the process of uranium mineralization is a discontinuous or catastro-phic *** and pressure are considered important thermodynamic conditions whichcontrol the distribution pattern of uranium mineralization,and the principle of temperature-pres-sure correspondence for uranium mineralization has been also *** bodies of mi-nerogenetic importance serve as favourable geochemical media for capturing ore-forming *** mineralization of commercial importance depends on a delicate coupling betweentemperature,pressure,and geochemical *** loci of uranium mineralization in the mo-del constitute the surface K,referred to as the surface of enrichment-mineralization,on whichminerogenetic domain is *** model provides quantitatively clues to the process of uranium mineralization,i.e.,a pro-cess from quantitative to qualitative changes.

关键词： A Catastrophe Mathematical Model for Uranium Mineralization of Hot-water Origin

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Three-dimensional fracture of UO_(2)ceramic pellets by phase field modeling

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Science China(Physics,Mechanics & Astronomy) 2025年第1期68卷 165-176页

作者： Wei Xiong Xuan Ye Hongzhang Cheng Xiaoming Liu Institute of nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyKey Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing 100084China State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

Fracture is the primary failure type for the UO_(2)ceramic pellets,which are operated under irradiation and thermal processes,and physically confined by the *** this work,by combining closely coupled physical processes of heat conduction,heat transfer,and mechanical deformation with the cohesive phase field framework,we proposed a high-precision modeling of quasistatic cracking of three-dimensional(3D)UO_(2)ceramic fuel pellets under high temperature and *** simulation results agree well with the experimental results,indicating that the proposed method has the potential to capture 3D crack modes in the interested time ***,we studied the relation of the 3D fracture patterns of fuel pellets with the peak power *** was found that the power level plays a critical role in determining the competition between radial and circumferential cracks,as well as transverse penetrating cracks.

关键词： phase field method nuclear fuel pellet coupled thermo-mechanical model thermal fracture

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Development of a general circumferentially nonuniform heat transfer fuel rod model for subchannel analysis and application to helical fuel rods

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Science China(Technological Sciences) 2025年第2期68卷 15-26页

作者： Junsen FU Junlong LI Xiaowen WANG Qi ZHANG Yao XIAO Hanyang GU School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of nuclear Power Systems and Equipment of the ministry of Education Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of nuclear Power Safety Technology and Equipment Shanghai Jiao Tong UniversityShanghai 200240China National Key Laboratory of nuclear Reactor Technology Nuclear Power Institute of ChinaChengdu 610213China

The subchannel analysis method is one of the most crucial transient safety analysis methods in the thermal design of nuclear *** nonuniformity of circumferential heat transfer is slight in conventional pressurized water reactor(PWR)cores,but it is significant in advanced reactors with wire-wrapped or helical fuel *** circumferentially nonuniform heat transfer behavior can be challenging owing to the complex geometry of helical fuel *** this study,a general circumferentially nonuniform heat transfer fuel rod(GCNF)model is developed to predict the fuel central temperature and circumferential heat flux and wall *** model incorporates a refined two-dimensional fuel conduction model and circumferential nonuniform shape factor,addressing the dual factors contributing to the circumferential nonuniformity of helical fuel *** empirical correlation for the nonuniform shape factor is developed based on the computational fluid dynamics(CFD)results,and it is implemented to the subchannel *** newly developed model is applied to a helical fuel annulus and validated by comparing the prediction results with CFD *** maximum wall temperature predicted by the code is 1.15℃ lower than the value calculated through *** terms of the heat flux,the maximum value at the inner corner is 22 kW lower than that obtained from the CFD *** accurate prediction of circumferentially nonuniform heat transfer in helical fuel,concerning the surface heat flux and cladding temperature,addresses existing shortcomings in helical fuel subchannel analysis ***,the capability to predict the fuel central temperature is essential for the safety analysis to determine whether fuel rods are *** generality of the model framework allows it to be used for the prediction of circumferential nonuniform heat transfer behavior in other types of fuel assemblies.

关键词： helical fuel rod refined fuel conduction model circumferentially nonuniform heat transfer subchannel analysis method

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Machine learning based damage state identification:A novel perspective on fragility analysis for nuclear power plants considering structural uncertainties

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Earthquake Engineering and Engineering Vibration 2025年第1期24卷 201-222页

作者： Zheng Zhi Wang Yong Pan Xiaolan Ji Duofa College of Civil Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology) Ministry of EducationHarbin 150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China

Seismic fragility analysis(SFA)is known as an effective probabilistic-based approach used to evaluate seismic *** are various sources of uncertainties associated with this approach.A nuclear power plant(NPP)system is an extremely important infrastructure and contains many structural uncertainties due to construction issues or structural deterioration during *** of structural uncertainties effects is a costly and time-consuming endeavor.A novel approach to SFA for the NPP considering structural uncertainties based on the damage state is proposed and *** results suggest that considering the structural uncertainties is essential in assessing the fragility of the NPP structure,and the impact of structural uncertainties tends to increase with the state of ***,machine learning(ML)is found to be superior in high-precision damage state identification of the NPP for reducing the time of nonlinear time-history analysis(NLTHA)and could be applied in the damage state-based ***,the impact of various sources of uncertainties is investigated through sensitivity *** Sobol and Shapley additive explanations(SHAP)method can be complementary to each other and able to solve the problem of quantifying seismic and structural uncertainties simultaneously and the interaction effect of each parameter.

关键词： seismic fragility analysis damage state structural uncertainties machine learning sensitivity analysis

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Prediction of the first 2^(+) states properties for atomic nuclei using light gradient boosting machine

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nuclear Science and Techniques 2025年第2期36卷 95-102页

作者： Hui Liu Xin-Xiang Li Yun Yuan Wen Luo Yi Xu School of nuclear Science and Technology University of South ChinaHengyang 421001China Extreme Light Infrastructure-nuclear Physics(ELI-NP) Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering(IFIN-HH)Strada Reactorului 30Buchurest-Magurele077125 IlfovRomania

The first 2^(+)excited states of the nucleus directly reflect the interaction between the shell structure and the nucleus,providing insights into the validity of the shell model and nuclear structure *** the features of the first 2^(+)excited states can be measured for stable nuclei and calculated using nuclear models,significant uncertainty *** study employs a machine learning model based on a light gradient boosting machine(LightGBM)to investigate the first 2^(+)excited ***,the training of the LightGBM algorithm and the prediction of the first 2^(+)properties of 642 nuclei are ***,detailed comparisons of the LightGBM predictions were performed with available experimental data,shell model calculations,and Bayesian neural network *** results revealed that the average difference between the LightGBM predictions and the experimental data was 18 times smaller than that obtained by the shell model and only 70%of the BNN prediction *** Mg,Ca,Kr,Sm,and Pb isotopes as examples,it was also observed that LightGBM can effectively reproduce the magic number mutation caused by shell effects,with the energy being as low as 0.04 MeV due to shape ***,we believe that leveraging LightGBM-based machine learning can profoundly enhance our insights into nuclear structures and provide new avenues for nuclear physics research.

关键词： First 2^(+) state nuclear levels Light gradient boosting machine

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Curcumin attenuates ochratoxin A and hypoxia co‑induced liver injury in grass carp(Ctenopharyngodon idella)by dual targeting endoplasmic reticulum stress and apoptosis via reducing ROS content

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Journal of Animal Science and Biotechnology 2025年第1期16卷 408-423页

作者： Liangqin Wu Piao Zhao Pei Wu Weidan Jiang Yang Liu Hongmei Ren Xiaowan Jin Xiaoqiu Zhou Lin Feng Animal Nutrition Institute Sichuan Agricultural UniversityChengdu 611130China Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province Sichuan Agricultural UniversityChengdu 611130China Key Laboratory of Animal Disease-Resistance Nutrition Ministry of EducationMinistry of Agriculture and Rural AffairsKey Laboratory of Sichuan ProvinceChengduSichuan 611130China

Background Ochratoxin A(otA)is a toxin widely found in aquafeed ingredients,and hypoxia is a common prob-lem in fish *** practice,aquatic animals tend to be more sensitive to hypoxia while feeds are contaminated with otA,but no studies exist in this *** research investigated the multiple biotoxicities of otA and hypoxia combined on the liver of grass carp and explored the mitigating effect of curcumin(CUR).Methods A total of 720 healthy juvenile grass carp(11.06±0.05 g)were selected and assigned randomly to 4 experi-mental groups:control group(without otA and CUR),1.2 mg/kg otA group,400 mg/kg CUR group,and 1.2 mg/kg otA+400 mg/kg CUR group with three replicates each for 60 ***,32 fish were selected,divided into nor-moxia(18 fish)and hypoxia(18 fish)groups,and subjected to hypoxia stress for 96 *** CUR can attenuate histopathological damage caused by coming to otA and hypoxia by reducing vacu-olation and nuclear *** alleviation of this damage was associated with the attenuation of apoptosis in the mitochondrial pathway by decreasing the expression of the pro-apoptotic proteins Caspase 3,8,9,Bax,and Apaf1 while increasing the expression of the anti-apoptotic protein Bcl-2,and attenuation of endoplasmic reticulum stress(ERS)by reducing Grp78 expression and chop *** may be attributed to the fact that the addi-tion of CUR increased the levels of catalase(CAT)and glutathione reductase(GSH),increased antioxidant capacity,and ensured the proper functioning of respiratory chain complexes I and II,which in turn reduced the high produc-tion of reactive oxygen species(ROS),thus alleviating apoptosis and *** In conclusion,our data demonstrate the effectiveness of CUR in attenuating liver injury caused by the combination of otA and *** study confirms the feasibility and efficacy of adding natural products to mitigate toxic damage to aquatic animals.

关键词： Apoptosis Curcumin Endoplasmic reticulum stress Grass carp Hypoxia Ochratoxin A Oxidative damage

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Construction of the porcine genome mobile element variations and investigation of its role in population diversity and gene expression

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Journal of Animal Science and Biotechnology 2025年第1期16卷 59-75页

作者： Jianchao Hu Lu Gui Zhongzi Wu Lusheng Huang National Key Laboratory for Swine Genetic Improvement and Germplasm Innovation Ministry of Science and Technology of ChinaJiangxi Agricultural UniversityNanchangPeople’s Republic of China

Background Mobile element variants(MEVs)have a significant and complex impact on genomic diversity and phe-notypic ***,the quantity,distribution,and relationship with gene expression and complex traits of MEVs in the pig genome remain poorly *** We constructed the most comprehensive porcine MEV library based on high-depth whole genome sequencing(WGS)data from 747 pigs across 59 breeds *** database identified a total of 147,993 poly-morphic MEVs,including 121,099 short interspersed nuclear elements(SINEs),26,053 long interspersed nuclear elements(LINEs),802 long terminal repeats(LTRs),and 39 other transposons,among which 54%are newly *** found that MEVs are unevenly distributed across the genome and are strongly influenced by negative selec-tion ***,we identified 514,530,and 584 candidate MEVs associated with population differentiation,domestication,and breed formation,*** example,a significantly differentiated MEV is located in the ATRX intron between Asian and European pigs,whereas ATRX is also differentially expressed between Asian and European pigs in muscle *** addition,we identified 4,169 expressed MEVs(eMEVs)significantly associated with gene expression and 6,914 splicing MEVs(sMEVs)associated with gene splicing based on RNA-seq data from 266 porcine liver *** eMEVs and sMEVs explain 6.24%and 9.47%,respectively,of the observed cis-heritability and high-light the important role of MEVs in the regulation of gene ***,we provide a high-quality SNP–MEV reference haplotype panel to impute MEV genotypes from genome-wide ***,we identified a candidate MEV significantly associated with total teat number,demonstrating the functionality of this reference *** The present investigation demonstrated the importance of MEVs in pigs in terms of population diversity,gene expression and phenotypic traits,which may provide useful resources and theoretic

关键词： Gene expression Genetic diversity Mobile element variants Pig SNP–MEV reference panel

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Xanthones from Garcinia pedunculata and Garcinia nujiangensis and their anti-inflammatory activity

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Chinese Journal of Natural Medicines 2025年第2期23卷 225-233页

作者： Xiaojie Fan Yufeng Jia Jiaxin Guo Jinyuan Yang Dahong Li Huiming Hua Key Laboratory of Structure-Based Drug Design & Discovery Ministry of Education and School of Traditional Chinese Materia Medica Shenyang Pharmaceutical University

Ten novel xanthones,garpedunxanthones A-G（1-5,6a/6b,7a/7b） and nujiangxanthone Q（8）,along with sixteen known analogs（9-24）,were isolated from Garcinia pedunculata and *** structures were elucidated through high-resolution electrospray ionization mass spectrometry（HR-ESI-MS） data,comprehensive nuclear magnetic resonance（NMR） spectroscopic analyses,and electronic circular dichroism（ECD） *** compounds without cytotoxicity were assessed for anti-inflammatory properties by measuring the inhibition of nitric oxide（NO） production in lipopolysaccharide（LPS）-induced ***-activity relationships are also *** 7b,19,and 21 exhibited significant anti-inflammatory activity with IC50values of 16.44±0.69,14.28±0.78,and 10.67±3.28 μmol·L-1,***-linked immunosorbent assay（ELISA） demonstrated that compounds 7b,19,and 21 inhibited the expression of pro-inflammatory cytokines TNF-α and IL-6 in a dose-dependent *** inhibitory effect of compo und 21 on IL-6 at 20 μmol·L-1was comparable to that of the positive *** network pharmacology studies,potential targets of compounds and inflammation were identified from PharmMapper and GeneCards *** Ontology（GO） and Kyoto Encyclopedia of Genes and Genomes（KEGG） enrichment analysis revealed that the overlapped targets were intricately associated with major pathogenic processes linked to inflammation,including positive regulation of mitogen-activated protein kinase（MAPK） cascade,protein kinase activity,NO synthase regulator activity,MAPK signaling pathway,and EGFR tyrosine kinase inhibitor resistance.

关键词： Anti-inflammation Garcinia nujiangensis Garcinia pedunculata Network pharmacology Xanthones

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Deep purification of perfluorinated electronic specialty gas with a scalable metal–organic framework featuring tailored positive potential traps

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Science Bulletin 2025年第2期70卷 232-240页

作者： Wei Xia Zhijie Zhou Liangzheng Sheng Lihang Chen Fang Zheng Zhiguo Zhang Qiwei Yang Qilong Ren Zongbi Bao Key Laboratory of Biomass Chemical Engineering of ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Institute of Zhejiang University-Quzhou Quzhou 324000China

The sequestration of trace hexafluoropropylene(C_(3)F_(6))is a critical yet formidable task in the production of high-purity perfluoropropane(C_(3)F_(8)),an important perfluorinated electronic specialty gas(F-gas)in the advanced electronics *** adsorbents struggle with uneven,low-pressure uptake and compromises in *** work utilizes aperture size-electrostatic potential matching within a robust metal–organic framework(Al-PMA)to facilitate selective,reversible binding of C_(3)F_(6)while excluding larger C_(3)F_(8)*** presence of bridging hydroxyl groups(μ_(2)-OH)in Al-PMA creates positive electrostatic potential traps that securely anchor C_(3)F_(6)through strong hydrogen bonding,evidenced by insitu infrared and^(19)F magic angle spinning nuclear magnetic resonance *** experiments demonstrate the efficient removal of trace C_(3)F_(6)from C_(3)F_(8)under ambient conditions,achieving C_(3)F_(8)purity exceeding 99.999%.The scalability of Al-PMA synthesis,remarkable stability,and exceptional performance highlight its potential as a promising adsorbent for industrial C_(3)F_(6)/C_(3)F_(8)separations.?2024 Science China *** by Elsevier *** Science China *** rights are reserved,including those for text and data mining,AI training,and similar technologies.

关键词： Deep purification Electronic specialty gas(ESGs) Metal-organic frameworks(MOFs) Positive potential traps(ppts)

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