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Exploration of the Mechanisms for the Low Sensitivity of Deposition Flux to Upstream Sediment Reduction in the North Passage, Yangtze Estuary

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China Ocean Engineering 2023年第4期37卷 533-546页

作者： WANG Xiao-guang ZHANG Wei TONG chao-feng LEI zhi-yi QIN Jie JI Xiao-mei HUANG Rui The National Key Laboratory of Water Disaster Prevention Hohai UniversityNanjing 210098China College of Harbor Coastal and Offshore EngineeringHohai UniversityNanjing 210098China

Deltas are densely populated industrialized regions,and home to important ports and navigation *** to human interferences,the Yangtze Estuary has experienced a significant reduction in sediment load caused by the Three Gorges Dam(TGD),as well as adjustment to local morphodynamics by the Deep-water Navigation Channel(DNC).While the dramatic reduction in sediment triggers the increased channel erosion,the deposition flux of the DNC located at the estuary mouth has little *** explore the physical mechanism of this phenomenon,a two-dimensional model is used to establish the relationship between sediment load and the sediment budget of channels based on the bathymetry in *** results show that the tidal reach and the inner estuary have a negative sediment *** the seasonal characteristics of water and sediment fluxes become less obvious *** analysis shows that the influence of upstream sediment load on deposition flux decreases along the channel,with a transition from deposition to erosion occurring in the tidal *** the last-level bifurcation,the annual siltation of sediment in the North Passage(NP)decreases by 4.5%with low *** is attributed to the reduction of sediment load partially mitigated by riverbed erosion and cascade *** addition,the lateral sediment supply,which accounts for 68%of the sediment input in the NP,is ***,this study strengthens the understanding of the relationship between sediment load and artificially deepened systems,thus allowing for better management of estuarine sediment and navigation channel.

关键词： delta navigation channel sediment load erosion and deposition sediment budget Yangtze Estuary

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Effect of order–disorder transition on thermodynamic and electronic properties of σ and χ phases in W–Re alloy: the first-principles calculation

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Tungsten 2025年第1期 195-213页

作者： zhi-Peng Zhu Dian Jia William Yi Wang Jun-Lei Yin Xing-Yu Gao Shu-feng Yang Hai-feng Song Jin-Shan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

The Tungsten-Rhenium(W-Re) alloys,celebrated for their high melting point,strength at elevated temperatures,electrical resistivity,and radiation resistance,have been widely utilized in high-temperature components,aerospace,electronics,and nuclear *** constituents of the topologically close-packed(TCP) phases,the sigma phase(σ) and chi phase(χ) formed within W-Re alloys wield considerable influence on the mechanical properties and the stability of the *** calculations were utilized in the present work to explore the structural,thermodynamic,and electronic properties of both ordered and disordered configurations within the σ and χ phases,culminating in a systematic elucidation of the higher phase stability exhibited by the ordered *** is found that the bulk modulus of these two phases is directly proportional to the concentration of Re in the alloy,while the equilibrium volume is inversely *** thermodynamic parameters of the σ and χ phases are calculated via the mean-field potential *** similar trends observed in the isobaric heat capacity,enthalpy increment,and entropy change curves for these two phases suggest they possess comparable thermodynamic *** is noteworthy that the contribution of ionic vibrations predominantly affects the isobaric heat capacity,while the contribution of thermal electronic excitations increases linearly with *** the structure and thermodynamic properties of TCP phases in W-Re alloys at low temperatures has profound significance for optimizing material performance,microstructures features,establishing theoretical foundations,and predicting material behavior.

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Onboard real time modeling of aircraft engines with Hammerstein-Wiener representation

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航空动力学报 2014年第10期29卷 2499-2506页

作者： WANG Ji-qiang YE zhi-feng HU Zhong-zhi Jiangsu Province Key Laboratory of Aerospace Power System College of Energy and Power EngineeringNanjing University of Aeronautics and Astronautics

An identification-based approach for aircraft engine modeling using the nonlinear HammersteinWiener representation was ***-Wiener modeling for both limited flight envelope and extended flight envelope was *** shows that the resulting model can be valid over 10%variation of rotational speed of the engine,compared with those linear models that are only valid over 3%—5%change of rotational *** is further demonstrated that the proposed method can be utilized over large envelope up to 20% variation of rotational speed of the *** fundamental idea is to use nonlinear models to extend the feasible/valid region rather than those linear *** may consequently simplify the switching logic in the onboard digital control *** is often overlooked in aircraft engine control community,but has been emphasized in the research.

关键词： aircraft engines engine modeling onboard real time modeling system identification Hammerstein-Wiener representation

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Theoretical investigations of collision dynamics of cytosine by low-energy (150-1000 eV) proton impact

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Chinese Physics B 2020年第2期29卷 262-268页

作者： zhi-Ping Wang feng-Shou Zhang Xue-Fen Xu chao-Yi Qian Department of Fundamental Courses Wuxi Institute of TechnologyWuxi 214121China The Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China

Using a real-space real-time implementation of time-dependent density functional theory coupled to molecular dynamics（TDDFT-MD） nonadiabatically,we theoretically study both static properties and collision process of cytosine by150-1000 eV proton impact in the microscopic *** calculated ground state of cytosine accords well with *** is found that proton is scattered in any case in the present *** bond break of cytosine occurs when the energy loss of proton is larger than 22 eV and the main dissociation pathway of cytosine is the breaks of C1 N2 and N8 *** the range of 150 eV≤Ek≤360 eV,when the incident energy of proton increases,the excitation becomes more violent even though the interaction time is *** in the range of 360 eV

关键词： time-dependent density functional theory cytosine collision proton

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Seismic performance of HWBBF considering different design methods and structural heights

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Frontiers of Structural and Civil Engineering 2023年第12期17卷 1849-1870页

作者： Yulong feng zhi ZHANG Zuanfeng PAN School of Civil Engineering Hefei University of TechnologyHefei 230009China Thornton Tomasetti New YorkNY 10271USA College of Civil Engineering Tongji UniversityShanghai 200092China

Previous research has shown that using buckling-restrained braces(BRBs)at hinged wall(HW)base(HWBB)can effectively mitigate lateral deformation of steel moment-resisting frames(MRFs)in *** and displacement-based design methods have been proposed to design HWBB to strengthen steel MRF and this paper comprehensively compares these two design methods,in terms of design steps,advantages/disadvantages,and structure *** addition,this paper investigates the building height below which the HW seismic moment demand can be properly ***,3-story,9-story,and 20-story steel MRFs in the SAC project are used as benchmark steel ***,HWs and HWBBs are designed to strengthen the benchmark steel MRFs using force-based and displacement-based methods,called HWFs and HWBBFs,***,nonlinear time history analyses are conducted to compare the structural responses of the MRFs,HWBBFs and HWFs in *** results show the following.1)HW seismic force demands increase as structural height increases,which may lead to uneconomical HW *** HW seismic moment demand can be properly controlled when the building is lower than nine stories.2)The displacement-based design method is recommended due to the benefit of identifying unfeasible component dimensions during the design process,as well as better achieving the design target displacement.

关键词： hinged wall moment-resisting frame seismic design displacement-based design nonlinear time-history analysis

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Synthesis of thorium sol for fabricating fuel kernels

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Nuclear Science and Techniques 2017年第7期28卷 53-58页

作者： feng-Xia Wang chao Yan Chang-Qing Cao Peng Wang He Huang Hai-Tao Jiang Jun Lin zhi-Xuan Cheng zhi-Yong Zhu Shanghai University Shanghai 200444 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Jiading Campus Shanghai Shanghai 201800 China

To fabricate thorium-based fuel kernel for solid fuel molten salt reactor,a component of tri-structural isotropic fuel particles is mostly based on sol-gel *** preparation of thorium sol is an important step for fabrication of thorium-based fuel kernels,such as thorium carbide and thorium *** gel quality affects the gel particle dispersion and the final *** this work,thorium sols were prepared using Th(NO_3)_4 and NH_3·H_2O by sol-gel *** effects of thorium concentration,mole ratio of NH_4^+/NO_3^- and reaction temperature on the pH,viscosity,turbidity,particle size and the thorium sol distribution were *** results show that the viscosity and turbidity increased with the NH_4^+/NO_3^- ratio;the turbidity and colloidal particle size increased with the reaction temperature,which affected little the sol viscosity;the sol viscosity increased with the thorium concentration,which virtually did not change the turbidity;and the particle size decreased and the size distribution narrowed with increasing thorium *** sol could be stored at room temperature for one day without significant property *** gel spheres of good quality were prepared at 60℃ with the NH_4^+/NO_3^- ratio of 75-85% and the thorium concentration of 1.2-1.4 mol/L.

关键词：溶胶-凝胶法固体燃料钍基制造合成凝胶颗粒反应温度燃料组件

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Present situation and prospect of immunotherapy for unresectable locally advanced esophageal cancer during peri-radiotherapy

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World Journal of Gastrointestinal Oncology 2024年第1期16卷 1-7页

作者： feng-Mei Wang Peng Mo Xue Yan Xin-Yue Lin zhi-chao Fu Department of Obstetrics and Gynecology Fuzong Clinical Medical College(900th Hospital)Fujian Medical UniversityFuzhou 350025Fujian ProvinceChina Department of Obstetrics and Gynecology Dongfang HospitalXiamen UniversityFuzhou 350025Fujian ProvinceChina Department of Radiotherapy Fuzong Clinical Medical College(900th Hospital)Fujian Medical UniversityFuzhou 350025Fujian ProvinceChina Department of Radiotherapy Dongfang HospitalXiamen UniversityFuzhou 350025Fujian ProvinceChina

Four major studies(Checkmate577,Keynote-590,Checkmate649 and Attraction-4)of locally advanced esophageal cancer published in 2020 have established the importance of immunotherapy,represented by anti-programmed death protein(PD)-1 in postoperative adjuvant treatment and advanced first-line treatment of locally advanced or advanced esophageal cancer and esophagogastric junction cancer,from the aspects of proof of concept,long-term survival,overall survival rate and progression-free *** unresectable or inoperable nonmetastatic esophageal cancer,concurrent radiotherapy and chemotherapy is the standard treatment recommended by various *** its curative effect is still not ideal,it is necessary to explore radical radiotherapy and chemotherapy in the future,and it is considered to be promising to combine them with immunotherapeutic drugs such as *** paper mainly discusses how to combine radical concurrent radiotherapy and chemotherapy with immunotherapy for unresectable local advanced esophageal cancer.

关键词： Esophageal carcinoma Locally advanced Radiotherapy Immunotherapy

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Mapping Seismic Hazard for Canadian Sites Using Spatially Smoothed Seismicity Model

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International Journal of Disaster Risk Science 2023年第6期14卷 898-918页

作者： chao feng Han-Ping Hong School of Civil Engineering Chang’an UniversityXi’an 710061China School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhen 518055China Department of Civil and Environmental Engineering University of Western OntarioLondon N6A 5B9Canada

The estimated seismic hazard based on the delineated seismic source model is used as the basis to assign the seismic design loads in Canadian structural design *** alternative for the estimation is based on a spatially smoothed source ***,a quantification of differences in the Canadian seismic hazard maps(CanSHMs)obtained based on the delineated seismic source model and spatially smoothed model is *** quantification is valuable to identify epistemic uncertainty in the estimated seismic hazard and the degree of uncertainty in the *** the present study,we developed seismic source models using spatial smoothing and historical earthquake *** quantified the differences in the estimated Canadian seismic hazard by considering the delineated source model and spatially smoothed source *** the development of the spatially smoothed seismic source models,we considered spatial kernel smoothing techniques with or without adaptive *** results indicate that the use of the delineated seismic source model could lead to under or over-estimation of the seismic hazard as compared to those estimated based on spatially smoothed seismic source *** suggests that an epistemic uncertainty caused by the seismic source models should be considered to map the seismic hazard.

关键词： Adaptive kernel smoothing Fixed kernel smoothing Ground motion model Probabilistic seismic hazard analysis Seismic hazard map Uniform hazard spectra

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Passivity-based consensus for linear multi-agent systems under switching topologies

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Control Theory and Technology 2014年第3期12卷 304-316页

作者： zhi feng Guoqiang HU School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798

This paper studies the passivity-based consensus analysis and synthesis problems for a class of stochastic multi-agent systems with switching topologies. Based on Lyapunov methods, stochastic theory, and graph theory, new different storage Lyapunov functions are proposed to derive sufficient conditions on mean-square exponential consensus and stochastic passivity for multi-agent systems under two different switching cases, respectively. By designing passive time-varying consensus protocols, the solvability conditions for the passivity-based consensus protocol synthesis problem, i.e., passification, are derived based on linearization techniques. Numerical simulations are provided to illustrate the effectiveness of the proposed methods.

关键词： Consensus Linear multi-agent systems Passivity and passification Networks with switching topology

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我国残膜回收装备研发要点及实践

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新疆农机化 2016年第5期 8-11页

作者：陈有庆胡志超吴峰顾峰玮徐弘博游兆延施丽莉农业部南京农业机械化研究所江苏南京210000

文中阐述了国内外残膜回收技术设备现状,分析了残膜机械化回收技术难点与研发要点,结合残膜机械化回收技术难点与研发要点介绍了项目组研制的几种残膜回收设备,以供读者参考。

关键词：残膜回收技术装备现状

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