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Risk assessment of glacial debris flow on alpine highway under climate change: A case study of Aierkuran Gully along Karakoram Highway

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Journal of Mountain Science 2021年第6期18卷 1458-1475页

作者： LI Ya-mei su Li-jun ZOU Qiang WEI Xue-li Institute of Tibetan Plateau Research Chinese Academy of SciencesBeijing 100101China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China Key Laboratory of Mountain Hazards and Earth surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengduSichuan 610041China China-Pakistan Joint Research Centre on Earth Sciences CAS-HECIslamabad 45320Pakistan University of Chinese Academy of Sciences Beijing 100049China Transportation Planning survey and Design Institute of Xinjiang Uygur Autonomous Region Urumqi 830006China

Glacial debris flows(GDFs) often occur in alpine regions that are subject to rapid climate change, and pose a serious threat to road systems. However, the ways that climate change impacts GDF risks along road systems remain poorly understood. Aierkuran Gully, located in eastern Pamir along Karakoram Highway(KKH), is a hotspot for GDF activity and climate change, and was thus selected to investigate the GDF risk to road systems under climate change conditions. Reg CM4.6 climate data for northwestern China were selected as climate projections during baseline(2011–2020) and future periods(2031–2040) under the Representative Concentration Pathway(RCP) 8.5. To reflect the coupling effect of rainfall and melt water that triggers GDF, a glacial hydrological model DETIM that considers both factors was applied to calculate the peak debris flow discharge. A FLO-2D model was calibrated based on high-quality data collected from a detailed field investigation and historical debris flow event. The FLO-2D model was used to simulate the debris flow depth and velocity during baseline and future periods under RCP8.5. The debris flow hazard was analyzed by integrating the maximum flow depth and momentum. Road structure vulnerability was further determined based on the economic value and susceptibility of hazard-affected objects. The GDF risk along KKH was assessed based on the GDF hazard and vulnerability analysis. Our results show that climate change would lead to amplified peak debris flow discharge, trigger highermagnitude GDF, and induce more severe damage and threats to the road system. Compared with the baseline period, the debris flow damage risk for culverts and bridges would increase and the areas that inundate the road and pavement would expand. Our findings provide valuable insights for the development of mitigation strategies to adapt road systems to climate change, especially in alpine regions with highly active GDFs.

关键词： Glacial debris flow Risk assessment Climate change Alpine area Karakoram Highway

Posttransplant blockade of CXCR4 improves leukemia complete remission rates and donor stem cell engraftment without aggravating GVHD

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Cellular & Molecular Immunology 2021年第11期18卷 2541-2553页

作者： Long su Ming-Hui Fang jun Zou su-jun Gao Xiao-Yi Gu Xian-Di Meng Xue Wang Zheng Hu Yong-Guang Yang Key Laboratory of Organ Regeneration&Transplantation of the Ministry of Education The First HospitalJilin UniversityChangchunChina National-Local Joint Engineering Laboratory of Animal Models for Human Diseases ChangchunChina Department of Hematology The First HospitalJilin UniversityChangchunChina Department of Oncology The First HospitalJilin UniversityChangchunChina International Center of Future Science Jilin UniversityChangchunChina

Allogeneic hematopoietic cell transplantation(allo-HCT)is a promising therapeutic option for hematological malignancies,but relapse resulting predominantly from residual disease in the bone marrow(BM)remains the major cause of treatment *** immunodeficient mice grafted with laboratory-generated human B-ALL,our previous study suggested that leukemia cells within the BM are resistant to graft-versus-leukemia(GVL)effects and that mobilization with CXCR4 antagonists may dislodge leukemia cells from the BM,enabling them to be destroyed by GVL *** this study,we extended this approach to patient-derived xenograft(PDX)and murine T-ALL and AML models to determine its clinical relevance and effects on GVHD and donor hematopoietic *** found that posttransplant treatment with the CXCR4 antagonist AMD3100 significantly improved the eradication of leukemia cells in the BM in PDX mice grafted with B-ALL cells from multiple ***3100 also significantly improved GVL effects in murine T-ALL and AML models and promoted donor hematopoietic engraftment in mice following nonmyeloablative ***,posttransplant treatment with AMD3100 had no detectable deleterious effect related to acute or chronic *** findings provide important preclinical data supporting the initiation of clinical trials exploring combination therapy with CXCR4 antagonists and allo-HCT.

关键词： Leukemia allogeneic hematopoietic cell transplantation Graft-vs.-leukemia

Modification of SDOF model for reinforced concrete beams under close-in explosion

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Defence Technology（防务技术） 2023年第2期20卷 162-186页

作者： Wei Wei Yu-lei Zhang Jian-jun su Yan Liu Feng-lei Huang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China Xi'an Modern Chemistry Research Institute Xi'an710065China

In this paper,a modified single-degree-of-freedom(SDOF)model of reinforced concrete(RC)beams under close-in explosion is proposed by developing the specific impulse equivalent method and flexural resistance calculation *** equivalent uniform specific impulse was obtained based on the local conservation of momentum and global conservation of kinetic ***,the influence of load uniformity,boundary condition and complex material behaviors(*** rate effect,hardening/softening and hoop-confined effect)was considered in the resistance calculation process by establishing a novel relationship between external force,bending moment,curvature and deflection *** accuracy of the proposed model was verified by carrying out field explosion tests on four RC beams with the scaled distances of 0.5 m/kg~(1/3)and 0.75 m/kg~(1/3).The test data in other literatures were also used for *** a result,the equivalent load implies that the blast load near the mid-span of beams would contribute more to the maximum displacement,which was also observed in the ***,both the resistance model and test results declare that when the blast load becomes more concentrated,the ultimate resistance would become lower,and the compressive concrete would be more prone to softening and ***,based on the modified SDOF model,the calculated maximum displacements agreed well with the test data in this paper and other *** work fully proves the rationality of the modified SDOF method,which will contribute to a more accurate damage assessment of RC structures under close-in explosion.

关键词： SDOF model Close-in explosion Specific impulse equivalent method Flexural resistance

An novel energy dissipator with self-recovery capability after deformation for structurally energy-dissipating rock-shed

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Journal of Mountain Science 2021年第11期18卷 3058-3068页

作者： XIE Qi-jun su Li-jun BAI Hao TANG Hao ZHANG Chong-lei YU Fang-wei Key Laboratory of Mountain Hazards and Earth surface Processes Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China Sichuan Expressway Construction&Development Group CO. LTD.Chengdu 610041China China-Pakistan joint Research Center on Earth Sciences CAS-HECIslamabad 45320Pakistan University of Chinese Academy of Sciences Beijing 100049China College of Environment and Civil Engineering in Chengdu University of Technology Chengdu 610051China

Theperformanceof a structurally dissipating rock-shed(SDR)depends largely onthecapacityofitsenergy *** present,mostenergy dissipatorsare made of metals,which dissipateenergy by unrecoverable plastic ***,they are not able to recover their energy-dissipation capacity after deformation under rockfall ***,a rockfall usually disintegrates into pieces when it rolls down from a higher position and results in multiple rockfall *** energy dissipator with self-recovery capability is therefore more suitable for ensuring the safety of *** metal with polyurethane(a hyperelastic material with remarkable self-recovery capability)can provide self-recovery capability for energy dissipators,making them more suitable for resisting multiple rockfall *** this work,polyurethane was manufactured into twotypes ofenergy dissipators:cylindrical and ***-scale falling rock impact testsand dynamic numerical simulationswereconducted to study the mechanical response of the energy *** addition,in order to ensure the accuracy of the simulation,the dynamic mechanical properties of the polyurethanewere tested and its dynamic constitutive model was *** experimental and simulation tests have clarified the advantages of the polyurethane energy *** also summarized the practical considerations in the design of energy dissipators.

关键词： Recoverableenergy dissipator Dynamic constitutive model Rockfall test Numerical simulation Resist multiple impacts

Comparison between nuclear thermometers in central Xe+Sn collision

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Nuclear Science and Techniques 2013年第5期24卷 67-70页

作者： GUO Chenchen su jun ZHANG Fengshou The Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal University Beijing Radiation Center Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou

The temperature of fragmenting source in central heavy-ion collisions at Fermi energy is investigated by the isospin-dependent quantum molecular dynamics model in combination with the statistical decay model *** different nuclear thermometers are used to extract nuclear *** find that the He and Li isotope temperature reaches a plateau at about 70-100 MeV/nucleon of beam *** slope temperature and the quadrupole fluctuation temperature give high *** quantum slope temperature and the quantum quadrupole fluctuation temperature are more close to the He and Li isotope temperatures.

关键词：重离子碰撞温度计量子分子动力学模型中央 GEMINI 同位旋相关模型组合费米能级

Roles of N△→NN and πN→△ Reactions in Heavy-Ion Collisions at Intermediate Energies

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Communications in Theoretical Physics 2019年第2期71卷 203-208页

作者： Wen-Jie Xie Li-jun Wang jun su Feng-Shou Zhang Department of Physics Yuncheng UniversityYuncheng 044000China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China The Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China

Within the framework of the isospin-dependent transport model, the roles of the reactions N? → NN and πN→ ? are investigated through simulating heavy-ion collisions at 1000 MeV/nucleon. The absorption process N? → NN plays an important role for heavy impact systems and small impact parameters than for light impact systems and large impact parameters. The resorption process πN→ ? is of importance for heavy impact systems and large impact parameters than for light impact systems and small impact parameters. Thus the influences of the reaction N? → N N(πN→ ?) on pion production dynamics can be neglected in heavy-ion collisions for smaller(larger) impact parameters and light systems. It is the reaction πN→ ? that causes the anti-correlation of pions and nucleons in the rapidity dependence of the directed flow.

关键词： transport model pion production N△→NN πN→△

Diversity of Microbial Community in a Paddy Soil with cry1Ac/cpti Transgenic Rice

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Pedosphere 2014年第3期24卷 349-358页

作者： SONG Ya-Na su jun CHEN Rui LIN Yan WANG Feng Institute of Biological Technology Fujian Academy of Agricultural Sciences

Two types of crylAc/cpti transgenic rice （GM1 and GM2） and their parental non-crylAc/cpti rice （CK1 and CK2） were planted in the field at Wufeng, Fhjian Province, China for four years to investigate the influence of genetically modified rice on diversity of bacterial and fungal community in the paddy soil. The community composition and abundance of bacteria or fungi in the paddy soil were assessed at different growth stages of rice by denaturing gradient gel electrophoresis and real-time polymerase chain reaction based on 16S rRNA gene or Ssu rRNA gene in the 4th year after the experimental establishment. The composition of bacterial or fungal community changed during rice growth, while no significant differences were observed between the fields cultivated with GM1 and CK1, or between the fields cultivated with GM2 and CK2 in either bacterial or fungal community composition. The copy numbers of bacterial 16S rRNA gene in the soils with CK1, CK2, GM1 and GM2 ranged from 5.64 x 10i1 to 6.89 x 10li copies g-1 dry soil at rice growth stages, and those of fungal Ssu rRNA gene from 5.24 x 10s to 8.68 x l0s copies g-1 dry soil. There were no marked differences in the copies of bacterial 16S rRNA gene or fungal Ssu rRNA gene between CK1 and GM1 or between CK2 and GM2 at any growth stage of rice. Planting crylAc/cpti transgenic rice had no significant effect on composition and abundance of bacterial and fungal community in paddy soil during the rice growing season at least in the short term.

关键词： bacterial community denaturing gradient gel electrophoresis fungal community genetically modified plants real-time polymerase chain reaction

Estimating the maximum impact force of dry granular flow based on pileup characteristics

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Journal of Mountain Science 2019年第10期16卷 2435-2452页

作者： XIAO Si-you su Li-jun JIANG Yuan-jun MEHTAB Alam LI Cheng LIU Dao-chuan Key Laboratory of Mountain Hazards and Earth surface Processes and Institute of Mountain Hazards andEnvironmentChinese Academy of SciencesChengdu610041China University of Chinese Academy of Sciences Beijing100049China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing100101China Sichuan Highway Planning DesignResearch Institute LtdChengdu610041China

The maximum normal impact resultant force(NIRF)is usually regarded as the sum of the static earth pressure of the dead zone and the dynamic impact pressure of the flowing *** influence of the interaction between the flowing layer and dead zone on the impact force is *** this study,we classified two impact models with respect to the pileup characteristics of the dead ***,we employed the discrete element method to investigate the influences of the pileup characteristics on the impact force of dry granular flow on a tilted rigid *** the final pileup height is equal to the critical value,the maximum NIRF can be estimated using a hydrostatic model,because the main contribution to the maximum NIRF is the static earth pressure of the dead *** the final pileup height is less than the critical value,however,the particles in the dead zone are squeezed along the slope surface by the impact ofthe flowing layer on the dead zone,and because of shear effects,the flowing layer causes an entrainment in the dead *** results in a decrease in the volume of the dead zone at the moment of maximum NIRF with increases in the slope *** such,the maximum NIRF mainly comprises the instant impact force of the flowing layer,so hydro-dynamic models are effective for estimating the maximum *** models will benefit from further study of the components and distribution of the impact force of dry granular flow.

关键词： Dry granular flow Tilted retaining wall Impact force Discrete element method Pileup height

Interior and Exterior Decoration of Transition Metal Oxide Through Cu^(0)/Cu^(+) Co-Doping Strategy for High-Performance supercapacitor

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Nano-Micro Letters 2021年第4期13卷 96-109页

作者： Weifeng Liu Zhi Zhang Yanan Zhang Yifan Zheng Nishuang Liu jun su Yihua Gao Center for Nanoscale Characterization and Devices(CNCD) School of Physics and Wuhan National Laboratory for Optoelectronics(WNLO)Huazhong University of Science and Technology(HUST)Luoyu Road 1037Wuhan 430074People’s Republic of China College of Materials Science and Engineering Guangxi Key Laboratory of Optical and Electronic Materials and DevicesGuilin University of TechnologyGuilin 541004People’s Republic of China

Although CoO is a promising electrode material for supercapacitors due to its high theoretical capacitance,the practical applications still suffering from inferior electrochemical activity owing to its low electrical conductivity,poor structural stability and inefficient ***,we report a novel Cu0/Cu+co-doped CoO composite with adjustable metallic Cu0 and ion Cu+via a facile *** interior(Cu+)and exterior(Cu0)decoration of CoO,the electrochemical performance of CoO electrode has been significantly improved due to both the beneficial flower-like nanostructure and the synergetic effect of Cu0/Cu+co-doping,which results in a significantly enhanced specific capacitance(695 F g^(-1) at 1 A g^(-1))and high cyclic stability(93.4%retention over 10,000 cycles)than pristine ***,this co-doping strategy is also applicable to other transition metal oxide(NiO)with enhanced electrochemical *** addition,an asymmetric hybrid supercapacitor was assembled using the Cu0/Cu+co-doped CoO electrode and active carbon,which delivers a remarkable maximal energy density(35 Wh kg^(-1)),exceptional power density(16 kW kg^(-1))and ultralong cycle life(91.5%retention over 10,000 cycles).Theoretical calculations further verify that the co-doping of Cu^(0)/Cu^(+)can tune the electronic structure of CoO and improve the conductivity and electron *** study demonstrates a facile and favorable strategy to enhance the electrochemical performance of transition metal oxide electrode materials.

关键词： Cu^(0)/Cu^(+)co-doping Heterostructure Transition metal oxide supercapacitor