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Calculation of the energy dependence of fission fragments yields and kinetic energy distributions for neutron-induced ^(235)U fission

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Chinese Physics C 2024年第8期48卷 159-169页

作者： Ya-Ning Han Zheng Wei Yi-Xuan Wang Dong-Ying Huo Peng-Qi Zhang Ming Li Jun Ma Kang Wu Yong-Guang Zheng Yuan He Zhi-Yong Deng Tian-Zhi Jiang Xiang-Lin Zhuo Jin Li Yun Zhang Yu Zhang Jun-Run Wang Xiao-Dong su Ze-En Yao School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Engineering Research Center for Neutron Application Technology Ministry of EducationLanzhou UniversityLanzhou 730000China moe Frontiers Science Center for Rare Isotopes Lanzhou UniversityLanzhou 730000China School of Mathematics and Statistics Lanzhou UniversityLanzhou 730000China Nuclear Power Institute of China Chengdu 610000China

Fission fragments yields and average total kinetic energy are fundamental nuclear data for nuclear energy applications and the study of nuclear *** fission products,such as ^(95)Zr,^(99)Mo,^(140)Ba,^(144)Ce,and ^(147)Nd,serve as burnup monitors,assessing the number of fissions induced by neutrons on ^(235)***,current experimental data for these fission products worldwide are inconsistent,introducing significant uncertainty into related scientific *** this study,we employed the Potential-driving Model to calculate the independent yields of ^(235)U and evaluate its advantages in such ***,we investigated the energy dependence of independent yields to select important ***,we calculated the cumulative yields of ^(95)Zr,^(99)Mo,^(140)Ba,^(144)Ce,and ^(147)Nd,and compared them with existing literature data to explore the energy dependence of fission products for ^(235)*** the lack of fission product yield data above 14.8 MeV,we extended our calculated incident neutron energy to 20 MeV,aiming to support future scientific *** Geant4 physical model does not consider the influence of incident neutron energy on the average total kinetic energy of fission fragments;thus,we introduced the excitation function of the total kinetic energy of fission fragments recommended by Madland et al.,which effectively describes the experimental data of the average total kinetic energy of fragments formed in ^(235)U *** this paper,we comprehensively discuss the energy dependence of fission product yields and average total kinetic energy.

关键词： ^(235)U(n f) potential-driving model fission yields kinetic energies energy dependence

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超大直径盾构下穿高铁路基的沉降数值分析

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深圳大学学报（理工版） 2024年第3期41卷 377-386页

作者：娄洪峻苏栋林星涛王雪涛宋明深圳大学土木与交通工程学院广东深圳518060 深圳大学滨海城市韧性基础设施教育部重点实验室广东深圳518060 深圳大学深圳市地铁地下车站绿色高效智能建造重点实验室广东深圳518060 中交第二公路勘察设计研究院有限公司湖北武汉430056

为探究超大直径盾构隧道下穿城际铁路路基沉降规律,以中国武汉两湖隧道工程为例,基于Plaxis有限元软件,建立了铁路路基-土体-隧道的三维精细化数值模型,探讨盾构掘进过程中地层损失率、开挖面支护压力、盾尾注浆压力对隧道上方城际铁路... 详细信息

为探究超大直径盾构隧道下穿城际铁路路基沉降规律,以中国武汉两湖隧道工程为例,基于Plaxis有限元软件,建立了铁路路基-土体-隧道的三维精细化数值模型,探讨盾构掘进过程中地层损失率、开挖面支护压力、盾尾注浆压力对隧道上方城际铁路路基沉降的影响.结果显示,盾构下穿复合地层的过程中,高铁路基道砟层表面在盾构掘进方向上会发生不同程度的沉降;当盾构掘进引起的地层损失率从1.0%增加到1.6%时,铁路路基的最大沉降从18.86 mm增加到22.71 mm,增大了20.4%;当开挖面支护力处于隧道拱顶侧向静止土压力的0.7~1.4倍时,不同工况下盾构掘进引起的铁路路基变形差异较小(小于0.67 mm);注浆压力对铁路路基的沉降影响明显,随着注浆压力增大,铁路路基的沉降明显减小.当隧道拱顶注浆压力增大到拱顶侧向静止土压力的3倍(648 kPa)或以上时,沿铁路路基的最大差异沉降未超过规范要求(≤5 mm/10 m).研究结果可为超大直径盾构下穿高铁路基时掘进参数的设置提供参考.

关键词：隧道工程超大直径盾构盾构施工下穿铁路沉降控制地表沉降数值模拟

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Valley-filling instability and critical magnetic field for interaction-enhanced Zeeman response in doped WSe_(2) monolayers

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npj Computational Materials 2021年第1期7卷 1842-1849页

作者： Fengyuan Xuan su Ying Quek Centre for Advanced 2D Materials National University of Singapore6 Science Drive 2Singapore 117546Singapore Department of Physics National University of Singapore2 Science Drive 3Singapore 117551Singapore NUS Graduate School Integrative Sciences and Engineering Programme National University of SingaporeSingaporeSingapore Department of Materials Science and Engineering National University of SingaporeSingaporeSingapore

Carrier-doped transition metal dichalcogenide(TMD)monolayers are of great interest in valleytronics due to the large Zeeman response(g-factors)in these spin-valley-locked materials,arising from many-body *** develop an ab initio approach based on many-body perturbation theory to compute the interaction-enhanced g-factors in carrier-doped *** show that the g-factors of doped WSe2 monolayers are enhanced by screened-exchange interactions resulting from magnetic-field-induced changes in band *** interaction-enhanced g-factors g*agree well with *** traditional valleytronic materials such as silicon,the enhancement in g-factor vanishes beyond a critical magnetic field Bc achievable in standard *** identify ranges of g*for which this change in g-factor at Bc leads to a valley-filling instability and Landau level alignment,which is important for the study of quantum phase transitions in doped *** further demonstrate how to tune the g-factors and optimize the valley-polarization for the valley Hall effect.

关键词： effect interaction critical

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Anisotropic flow in high baryon density region

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Nuclear Science and Techniques 2022年第2期33卷 79-86页

作者： Shao-Wei Lan Shu-su Shi Key Laboratory of Quark and Lepton Physics(moe)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China

Collective flow is a powerful tool used to analyze the properties of a medium created during high-energy nuclear ***,we report a systematic study of the first two Fourier coefficients v_(1)and v_(2)of the proton andπ^(+)from Au+Au collisions in the energy range√sNN=2.11-4.9 GeV within the framework of a hadronic transport model(UrQMD).Recent results from the STAR experiment were used to test the model calculations.A meanfield mode with strong repulsive interaction is needed to reproduce the 10-40%data at 3 *** implies that hadronic interactions play an important role in the collective flow development in the high baryon density *** mean values of the freeze-out time for protons andπ^(+)are shifted earlier owing to the additional repulsive *** predict the energy dependence of the mean values of the transverse momentum,v_(1),and v_(2)for both protons andπ^(+)from the Au+Au collisions.

关键词： Heavy-ion collisions QCD phase diagram UrQMD Collective flow Mean-field potential

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Hepatitis B virus core protein as a Rab-GAP suppressor driving liver disease progression

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Science Bulletin 2024年第16期69卷 2580-2595页

作者： Yu su Fan Bu Yuanfei Zhu Le Yang Qiong Wu Yuan Zheng Jianjin Zhao Lin Yu Nan Jiang Yongxiang Wang Jian Wu Youhua Xie Xinxin Zhang Yueqiu Gao Ke Lan Qiang Deng Key Laboratory of Medical Molecular Virology(moe/NHC/CAMS) School of Basic Medical SciencesShanghai Institute of Infectious Disease and BiosecurityFudan UniversityShanghai 200032China Shanghai Frontiers Science Center of Pathogenic Microorganisms and Infection Fudan UniversityShanghai 200032China Department of Infectious Diseases Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025China Laboratory of Cellular Immunity Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghai 201203China State Key Laboratory of Virology College of Life SciencesWuhan UniversityWuhan 430072China

Chronic hepatitis B virus(HBV)infection can lead to advanced liver ***,we establish a transgenic murine model expressing a basic core promoter(BCP)-mutated HBV *** previous studies on the wild-type virus,the BCP-mutated HBV transgenic mice manifest chronic liver injury that culminates in cirrhosis and tumor development with ***,agonistic anti-Fas treatment induces fulminant hepatitis in these mice even at a negligible *** the BCP mutant exhibits a striking increase in HBV core protein(HBc)expression,we posit that HBc is actively involved in hepatocellular ***,HBc interferes with Fis1-stimulated mitochondrial recruitment of Tre-2/Bub2/Cdc16 domain family member 15(TBC1D15).HBc may also inhibit multiple Rab GTPase-activating proteins,including Rab7-specific TBC1D15 and TBC1D5,by binding to their conserved catalytic *** cells under mitochondrial stress,HBc thus perturbs mitochondrial dynamics and prevents the recycling of damaged ***,sustained HBc expression causes lysosomal consumption via Rab7 hyperactivation,which further hampers late-stage autophagy and substantially increases apoptotic cell ***,we show that adenovirally expressed HBc in a mouse model is directly cytopathic and causes profound liver injury,independent of antigen-specific immune *** findings reveal an unexpected cytopathic role of HBc,making it a pivotal target for HBV-associated liver disease *** BCP-mutated HBV transgenic mice also provide a valuable model for understanding chronic hepatitis B progression and for the assessment of therapeutic strategies.

关键词： Apoptosis Basic core promoter Mitophagy Rab7 Transgenic mice

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极端环境隧道建造面临的主要问题及发展趋势

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隧道建设（中英文） 2024年第3期44卷 401-432,I0005-I0036页

作者：陈湘生全昭熹陈一凡沈翔苏栋极端环境岩土和隧道工程智能建养全国重点实验室(深圳大学) 广东深圳518060 滨海城市韧性基础设施教育部重点实验室(深圳大学) 广东深圳518060 深圳大学土木与交通工程学院广东深圳518060

聚焦艰险山区、深水海域与城市敏感区3类极端环境,全面梳理和总结了在此环境下隧道建造面临的主要问题、相关技术突破和未来发展趋势。针对艰险山区中极高地应力、高地温、高海拔以及活动断裂带等极端条件,总结分析围岩和隧道的变形机... 详细信息

聚焦艰险山区、深水海域与城市敏感区3类极端环境,全面梳理和总结了在此环境下隧道建造面临的主要问题、相关技术突破和未来发展趋势。针对艰险山区中极高地应力、高地温、高海拔以及活动断裂带等极端条件,总结分析围岩和隧道的变形机制、破坏机制及防护措施,并指出未来可通过大数据、机器学习等手段建立更精准的预测模型,以实现隧道建造过程的实时监控和风险评估;针对深水海域中高水压、高烈度地震、强侵蚀环境等极端条件,分析多因素耦合下沉管法及盾构法隧道管片及接头的劣损和破坏机制,总结提升其力学和耐久性能的主要技术措施,并提出未来仍需针对海底隧道管片接头的防水、抗震及抗侵蚀性能开展更深入的研究,以形成完整的理论和技术体系;针对城市敏感区隧道穿越既有隧道、敏感建构筑物、地下障碍物等挑战,总结分析盾构法和顶管法施工环境响应规律、地层变形评估方法和控制技术措施,提出未来可采用机器学习等技术辅助隧道建设,以提升预测和控制的准确性,减小建设过程对城市环境的扰动。目前,相关研究成果为极端环境下的隧道工程建设提供了重要支撑,但部分技术仍需进一步在实践中完善并形成规范,以指导后续的工程建设;而随着新一代信息技术的发展,未来隧道建造必将朝着数字化、智能化、自动化的方向发展,从而保障极端环境下隧道建设的安全、绿色、高效。

关键词：隧道极端环境艰险山区深水海域城市敏感区施工技术

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Wide scope pollution-flashover of 500 KV transmission lines—causes and preventive countermeasures

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Electricity 1991年第1期 44-48页

作者： Xiang Liren su Zhiyi Li Peiguo Electric Power Research Institute,moe Zhou Qingchang

During two years odd period from Dec.1987 to Feb.1990,there had been repeatedly pollution-flashoverfailures on our 500 kV transmission lines,resulting in a wide *** were eleven 500 kV lines altogether in North-east,East and North China power grids,where pollution-flashover failureshappened one after another on 36 transmission line towers (poles).Since 500 kV transmission lines are the main trunks of high

关键词： strings repeatedly eleven preventive adjustment gases overs transm arouse umber

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Optimal livelihood strategy for different poverty groups among farmers: a case study of the Qin-Ba Mountain area in South-Shaanxi, China

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Journal of Mountain Science 2020年第5期17卷 1206-1220页

作者： su Fang YIN Ya-juan School of Economics and Management Shaanxi University of Science&TechnologyXi'an 710021China

Achieving sustainable livelihood is the ultimate goal of poverty alleviation efforts in mountainous areas,and selecting an optimal livelihood strategy for different poverty-type farmers greatly improves farmers’livelihood capital,resists livelihood risks,and promotes sustainable *** farmers,optimal livelihood strategy means better employment opportunities,higher family income(or better income structure),and stronger employability or development *** paper classifies different types of farmers’poverty on the basis of a quantitative evaluation of farmers’livelihood capital in the Qin-ba Mountain Area in South-Shaanxi by using the k-means clustering method and subsequently the fuzzy evaluation method to evaluate the effectiveness of farmers’livelihood ***,the multi-attribute decision-making model is used to analyze the selection of optimal livelihood strategies for different poverty-type *** results suggest a significant difference in the selection of the optimal livelihood strategy for different poverty-type *** without financial and human capital choose to"go out to work,"farmers lacking natural capital choose to"acquire social insurance and government relief,"farmers without physical capital choose to"use loans,"and farmers lacking social capital choose to"use savings."Studying the selection of optimal livelihood strategies for different poverty-type farmers can help to propose targeted sustainable livelihood optimization programs for farmers and accelerate efforts to overcome poverty in mountainous areas.

关键词： Optimal strategy Livelihood capital Effectiveness evaluation Qin-Ba Mountain Area Shaanxi

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Genome-wide analysis of differential DNA methylation in Silver-Russell syndrome

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Science China(Life Sciences) 2017年第7期60卷 692-699页

作者： Di Wu Chunxiu Gong Chang su Department of Endocrinology Genetics and Metabolism Beijing Children's Hospital Capital Medical University National Center for Children's Health MOE Key Laboratory of Major Diseases in Children Beijing 100045 China

Silver-Russell Syndrome(SRS) is clinically heterogeneous disorder characterized by low birth weight, postnatal growth restriction, and variable dysmorphic features. Current evidence strongly implicates imprinted genes as an important etiology of SRS. Although almost half of the patients showed DNA hypomethylation at the H19/IGF2 imprinted domain, and approximately7%–10% of SRS patients have maternal uniparental disomy of chromosome 7(UPD(7) mat); the rest of the SRS patients shows unknown etiology. In this study, we investigate whether there are further DNA methylation defects in SRS patients. We measured DNA methylation in seven SRS patients and five controls at more than 485,000 CpG sites using DNA methylation microarrays. We analyzed methylation changes genome-wide and identified the differentially methylated regions(DMRs) using bisulfite sequencing and digital PCR. Our analysis identifies epimutations at the previously characterized domains of H19/IGF2,providing proof of principle that our methodology can detect the changes in DNA methylation at imprinted loci. In addition,our results showed a novel SRS associated imprinted gene OSBPL5 located on chromosome 11p14 with the probe cg25963939,which is hypomethylated in 4/7 patients(P=0.023, β=.0.243). We also report DMRs in other genes including TGFβ3, HSF1,GAP43, NOTCH4 and MYH14. These DMRs were found to be associated with SRS using GO pathway analysis. In this study,we identified the probe cg25963939, located at the 5′UTR of imprinted gene OSBPL5, as a novel DMR that is associated with SRS. This finding provides new insights into the mechanism of SRS etiology and aid the further stratification of SRS patients by molecular phenotypes.

关键词： Silver-Russell syndrome methylation differences imprinted gene

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Construction mechanism of whitenization weight function and its application in grey clustering evaluation

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Journal of Systems Engineering and Electronics 2019年第1期30卷 121-131页

作者： XIE Naiming su Bentao CHEN Nanlei College of Economics and Management Nanjing University of Aeronautics and Astronautics

The clustering evaluation can be used to scientifically classify the objects to be evaluated according to the information aggregation of various evaluation rules. In grey weighted clustering evaluation, the index clustering rule relies on the construction of the whitenization weight function, while the existing construction method of the linear function lacks the construction mechanism analysis and validity explanation. A normative construction principle is put forward by analyzing the construction mechanism of the function. Through proving the normative principle of the function,the basic modal function(BMF) is proposed and characterized by different function forms. Then, a new type of the whitenization weight function and its grey clustering evaluation model algorithm are given by studying the mechanism and nature of the construction of different forms of the function. Finally, the comparative study for self-innovation capability of defense science and technology industry(DSTI) is taken as an example. The results show that the different construction ways of the function have an effect on the clustering result. The proposed construction mechanism can better explain the index clustering rules and evaluation effectiveness,which will perfect the theoretical system of grey clustering evaluation and be applied to practice effectively.

关键词： whitenization weight function grey system theory grey clustering evaluation.

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