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The Henan extreme rainfall in July 2021: Modulation of the northward-shift monsoon trough on the synoptic-scale wave train

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Advances in Climate Change Research 2022年第6期13卷 819-825页

作者： si-Hua HUANG Zhi-Ping wen Xiao-Dan CHEN Yuan-Yuan GUO Zhe-wen WANG Department of Atmospheric and Oceanic Sciences&Institute of Atmospheric Sciences Fudan UniversityShanghai 200438China Institute of Eco-chongming(IEC) Shanghai 200062China Innovation Center of Ocean and Atmosphere System Zhuhai Fudan Innovation Research InstituteZhuhai 518057China Jiangsu Collaborative Innovation Center for Climate Change Nanjing 210023China Zhumadian Meteorological Office Zhumadian 463000China

The synoptic-scale wave train is a dominant pattern of the synoptic variability over the tropical western Pacific and usually affects the extreme weather over South China and Southeast *** it could extend its influence and contribute to the Henan extreme rainfall in July 2021 still needs to be *** found that during the Henan extreme rainfall days a positively synoptic-scale vorticity disturbance dominated Henan province,China,which was embedded in the synoptic-scale wave train that originated from the western North ***,the propagating pathway of this synoptic-scale wave train located northward and was likely modulated by the latitudinal location change of the monsoon trough over the western North Pacific.A northernmost displacement of the monsoon trough in July 2021(∼23.2°N)would facilitate the synoptic-scale wave train to propagate farther northwestward via shifting the related barotropic conversion ***,the synoptic-scale wave train from the tropics could reach Henan,provide the necessary lifting forcing,and supply abundant water vapor associated with the anomalous southerly for the occurrence of Henan extreme rainfall *** results implicate that the pre-existing synoptic-scale wave train regulated by the location of the monsoon trough may be a potential precursor for heavy rainfalls in northern Central China.

关键词： Extreme rainfall Northern Central China Synoptic-scale wave train Monsoon trough Barotropic energy conversion

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Study of the Lift Force Induced by An Interceptor on A High-Speed Mono-Hull:The Affecting Factors and Estimation Formula

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China Ocean Engineering 2024年第4期38卷 557-571页

作者： DENG Rui HU Yu-xiao HUANG si-chong SONG Zhi-jie WANG Shi-gang WU Tie-cheng School of Ocean Engineering and Technology Sun Yat-sen Universityand Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China

To find a better way to estimate the lift force induced by an interceptor on a high-speed mono-hull ship,a series of high-speed mono-hull ship models are designed and investigated under different *** lift forces are obtained by numerical calculations and validated by a model test in a towing *** factors that influence the force are the interceptor height,velocity,draft,and deadrise *** relationship between each factor and the induced lift force is investigated and *** found that the induced lift mainly depends on the interceptor height and advancing velocity,and is proportional to the square of the interceptor height and *** results also showed that the effects of the draft and deadrise angle are relatively less important,and the relationship between the induced lift and these two factors is generally *** on the results,a formula including the combined effect of all factors used to estimate the lift force induced by the interceptor is developed based on systematic *** proposed formula could be used to estimate the lift force induced by interceptors,especially under high-speed condition.

关键词： high-speed mono-hull ship interceptor lift force formula lift force towing tank test computational fluid dynamics

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Performance Measures for Systems Under Multiple Environments

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IEEE/CAA Journal of Automatica sinica 2016年第1期3卷 90-95页

作者： Baoliang Liu Lirong Cui Shubin si Yanqing wen College of Mathematics and Computer Science Shanxi Datong University School of Management and Economics Beijing Institute of Technology School of Mechatronics Northwestern Polytechnical University

In this paper, the system which operates in multiple environments is studied. The environment process is governed by a Markov process, and the deterioration process is governed by another Markov process given the system in a certain environment. In terms of the above two processes, a new Markov process is constructed to represent the evolution of the system. In terms of Ion-Channel modeling theory, Markov process theory and matrix partition method, some reliability indexes for the system are obtained, i.e., system reliability, environment reliability, system multiple-interval reliability, system availability, environment availability, system multiple-point availability, etc. Finally, a numerical example is given to illustrate the results obtained in the paper. © 2014 Chinese Association of Automation.

关键词： Markov processes Numerical methods Reliability Reliability theory

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Optimal power allocation for multi-user OFDM and distributed antenna cognitive radio with RoF

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The Journal of China Universities of Posts and Telecommunications 2010年第6期17卷 41-46,71页

作者： GE wen-dong JI Hong si Peng-bo LI Yi School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China School of Electronics Information and Control Engineering Beijing University of Technology Beijing 100022 China

In cognitive radio （CR）,power allocation plays an important role in protecting primary user from disturbance of secondary user. Some existing studies about power allocation in CR utilize ＇interference temperature＇ to achieve this protection,which might not be suitable for the OFDM-based CR. Thus in this paper,power allocation problem in multi-user orthogonal frequency division multiplexing （OFDM） and distributed antenna cognitive radio with radio over fiber （RoF） is firstly modeled as an optimization problem,where the limitation on secondary user is not ＇interference temperature＇,but that total throughput of primary user in all the resource units （RUs） must be beyond the given threshold. Moreover,based on the theorem about maximizing the total throughput of secondary user,equal power allocation algorithm is introduced. Furthermore,as the optimization problem for power allocation is not convex,it is transformed to be a convex one with geometric programming,where the solution can be obtained using duality and Karush-Kuhn-Tucker （KKT） conditions to form the optimal power allocation algorithm. Finally,extensive simulation results illustrate the significant performance improvement of the optimal algorithm compared to the existing algorithm and equal power allocation algorithm.

关键词： cognitive radio power allocation OFDM distributed antenna convex optimization radio over fiber (RoF)

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Rejuvenating soybean(Glycine max L.)growth and development through slight shading stress

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Journal of Integrative Agriculture 2020年第10期19卷 2439-2450页

作者： wen Bing-xiao Sajad HUSSAIN YANG Jia-yue WANG Shan ZHANG Yi QIN si-si XU Mei YANG wen-yu LIU Wei-guo Institute of Ecological Agriculture Sichuan Agricultural University/Sichuan Engineering Research Centre for Crop Strip Intercropping SystemChengdu 611130P.R.China

The impact of increased shading stress on agronomic traits,photosynthetic performance and antioxidants activities in leaves of two soybeans cultivars(D16 and E93)was *** seedlings were grown in pots and exposed to no shade(S0),slight shade(S1),moderate shade(S2),and heavy shade(S3).Our findings showed that under the S3 in both cultivars,leaf fresh weight(LFW),specific leaf area(SLA)and leaf thickness decreased signifiantly,accompanied by a reduction in photochemical parameters including the maximum quantum yield(Fv/Fm)and electron transport rate(ETR).Furthermore,compared to SO,S1 significantly increased the ETR,sucrose content and the activity of catalase(CAT)in both D16 and E93 cultivars while S2 and S3 decreased the ***,under all treatments of shading stress,the antioxidant activities of superoxide dismutase(SOD)and peroxidase(POD)were lowered in both *** morphological and physiological plasticity to adapt S1 compensates for the decrease in biomass and leads to seed weight compared to that obtained with an amount of normal *** configuring the space in the intercropping systems,S1 could be helpful for optimum growth and *** photosynthesis through S1 for the intercropping systems could be a smart approach.

关键词： plant morphology photosynthesis antioxidant systems slight shade

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Synthesis and Compression Property of Oxidation-Resistant Ni-Al Foams

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Acta Metallurgica sinica(English Letters) 2017年第10期30卷 965-972页

作者： wen-wen Zeng si-Han Hou Xiao-Jun Ding De-Li Duan Shu Li Shi-Hong Zhang University of Chinese Academy of Sciences Institute of Metal Research Chinese Academy of Sciences

Three different Ni-Al foams were synthesized by vapor aluminizing with control of aluminizing time. Oxidation tests under 1100 ℃ and compression tests were conducted to evaluate the oxidation resistance and compression properties of the foams. X-ray diffraction（XRD）, scanning electron microscopy（SEM）, and energy-dispersive spectroscopy（EDS）tests were carried out to study the phase composition and microstructure of Ni-Al foams before and after oxidation. Results showed that vapor aluminizing process did not change the foam macro-and microstructure, and the phase composition became from β/γ＇-phase to single β-phase as the aluminizing time extending. The Ni-Al foams possessed excellent oxidation resistance, and decreased A1 content increased oxidation weight gain and altered oxidation products. Foams containing single β-phase presented obvious brittleness under compression tests, but the foam with β/γ＇-phase exhibited elasticity and toughness to a certain extent. The elasticity and toughness of the foams significantly can be improved after oxidation because of the phase changing in matrix during oxidation, and the pre-oxidized high-Al-content Ni-Al foams exhibited good compression properties, as well as excellent oxidation resistance.

关键词： Ni-Al foams Vapor aluminizing Oxidation Compression

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Coking properties of thermal soluble constituents of coals by N-methyl-2-pyrrolidone solvent

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Journal of Iron and Steel Research International 2018年第4期25卷 378-386页

作者： Hai-bin Zuo si-yang Long Jing-song Wang wen-tao Guo State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Beijing 100083 China

Four types of coals, KL, XB, ZS and GD with different coal ranks, were dissolved with the organic solvent N-methyl-2- pyrrolidone at 350 ℃ and around 3.0 MPa pressure to obtain thermal soluble constituents （TSCs）. The yield, component and maceral group were investigated as well as their coking properties, including caking index and thermoplasticity. The results indicated that the yields of the four coals were of the following order： KL 〉 XB 〉 ZS 〉 GD. Based on the yield and the vitrinite content, coals were ranked from high to low. The ash contents of TSCs were significantly less than that of raw coals, and the TSCs contain more light components, leading to an increase in volatile matter. The patterns of Fourier transform infrared spectroscopy indicated that carbonyl was enriched in TSCs. Regarding the maceral group, TSCs were mainly composed of vitrinite which is the main reactive material and converts into binder phase in cokemaking process. Higher caking index values and fluidity were obtained in TSCs compared with the raw coals. The coking experiments with different amounts of TSCs addition were carried out. The results demonstrated that the proper TSCs addition could enhance the coke strength due to its high caking index and good fluidity.

关键词： Thermal soluble constituent Coking property Maceral group Fluidity Coal

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Contrasting physical properties of the trilayer nickelates Nd4Ni3O10 and Nd4Ni3O8

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Science China(Physics,Mechanics & Astronomy) 2021年第2期64卷 98-104页

作者： Qing Li ChengPing He XiYu Zhu Jin si XinWei Fan Hai-Hu wen Center for Superconducting Physics and Materials National Laboratory of Solid State Microstructures and Department of PhysicsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China

We report the crystal structures and physical properties of trilayer nickelates Nd4Ni3O10and *** of magnetization and electrical resistivity display contrasting behaviors in the two ***4Ni3O10shows a paramagnetic metallic behavior with a metal-to-metal phase transition(T^*)at about 162 K,as revealed by both magnetic susceptibility and *** magnetoresistance and Hall coefficient results show a negative magnetoresistance at low temperatures and the carrier type of Nd4Ni3O10is dominated by hole-type charge *** significant enhancement of Hall coefficient and resistivity below T*suggests that effective charge carrier density decreases when cooling through the transition *** contrast,Nd4Ni3O8 shows an insulating *** addition,this compound shows a paramagnetic behavior with the similar magnetic moment as that of Nd4Ni3O10derived from the Curie-Weiss *** may suggest that the magnetic moments in both systems are contributed by Nd^3+ *** applying pressures up to about 49 GPa,the insulating behavior is still present and becomes even stronger under a high *** results suggest that the different Ni configurations(Ni^1+/2+ or Ni^2+/3+)and the changes of coordination environment of Ni sites may account for the contrasting behaviors in trilayer nickelates Nd4Ni3O10and Nd4Ni3O8.

关键词： trilayer nickelate Nd4Ni3O10 and Nd4Ni3O8 high-pressure study

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Overcharging a Reissner-Nordström Taub-NUT regular black hole

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Science China(Physics,Mechanics & Astronomy) 2021年第6期64卷 17-25页

作者： wen-Bin Feng si-Jiang Yang Qin Tan Jie Yang Yu-Xiao Liu Institute of Theoretical Physics&Research Center of Gravitation Lanzhou UniversityLanzhou 730000China Key Laboratory for Magnetism and Magnetic of the Ministry of Education Lanzhou UniversityLanzhou 730000China Joint Research Center for Physics Lanzhou University and Qinghai Normal UniversityLanzhou 730000 and Xining 810000China

The destruction of a regular black hole event horizon might provide us the possibility to access regions inside black hole event *** paper investigates the possibility of overcharging a charged Taub-NUT regular black hole via the scattering of a charged field and the absorption of a charged *** the charged scalar field scattering,both the near-extremal and extremal charged Taub-NUT regular black holes cannot be *** the test charged particle absorption,the result shows that the event horizon of the extremal charged Taub-NUT regular black hole still exists while the event horizon of the near-extremal one can be ***,if the charge and energy cross the event horizon in a continuous path,the near-extremal charged Taub-NUT regular black hole might not be overcharged.

关键词： weak cosmic censorship conjecture black hole thermodynamics Taub-NUT black hole

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In situ scattering study of multiscale structural evolution during liquid–liquid phase transition in Mg-based metallic glasses

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Rare Metals 2021年第11期40卷 3107-3116页

作者： Kang-Hua Li Jia-Cheng Ge si-Nan Liu Shu Fu Zi-Xuan Yin wen-Tao Zhang Guo-Xing Chen Shao-chong Wei Hua Ji Tao Feng Qi Liu Xun-Li Wang Xiao-Bing Zuo Yang Ren Horst Hahn si Lan Herbert Gleiter Institute of Nanoscience School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Suzhou Nuclear Power Research Institute Co. LtdSuzhou 215004China Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Physics City University of Hong KongHong Kong 999077China Center for Neutron Scattering City University of Hong Kong Shenzhen Research InstituteShenzhen 518057China X-Ray Sciences Division Argonne National LaboratoryLemontIL 60439USA Institute of Nanotechnology Karlsruhe Institute of Technology(KIT)Eggenstein-Leopoldshafen 76344Germany

The glass-forming ability of Mg-Cu-Gd alloys could be significantly promoted with the addition of Ag.A calorimetric anomaly could be observed in the supercooled liquid region of the Mg-Cu-Ag-Gd metallic glass,indicating the occurrence of a liquid-state phase transition driven by ***,the underlying mechanism of the polyamorphous phase transition remains *** the paper,in situ scattering techniques were employed to reveal multiscale structure evidence in a Mg65Cu15Ag10Gd10metallic glass with an anomalous exothermic peak upon *** measurements indicate a reentrant behavior for the Mg-Cu-Ag-Gd metallic glass in the anomalous exothermic peak temperature region during *** situ synchrotron diffraction results revealed that the local atomic structure tends to be ordered and loosely packed first,followed by reentering into the initial state upon ***,time-resolved small-angle synchrotron X-ray scattering(SAXS) results show an increase in nanoscale heterogeneity first followed by a reentrant supercooled liquid behavior.A core-shell structure model has been used to fit the SAXS profiles when polyamorphous phase transition *** contrast,there is no structure anomaly for the reference Mg-Cu-Gd alloy *** detailed multiscale structural evidence suggests the occurrence of a liquid-liquid phase transition followed by a reentrant behavior in the MgCu-Ag-Gd metallic *** results deepen the understanding of the structural origin of the glass-forming ability and shed light on the possibility of tuning the physical and mechanical properties by heat-treatment in the supercooled liquid region of Mg-based metallic glasses.

关键词： Metallic glasses Anomalous exothermal peak Polyamorphous transition Synchrotron scattering

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