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| 1 | Spatial and seasonal variability of CO_2 flux at the air-water interface of the Three Gorges Reservoir显示文摘Difusive carbon dioxide(CO2) emissions from the water surface of the Three Gorges Reservoir, currently the largest hydroelectric reservoir in the world, were measured using floating static chambers over the course of a yearlong survey. The results showed that the average annual CO2 flux was(163.3 ± 117.4) mg CO2/(m2·hr) at the reservoir surface, which was larger than the CO2 flux in most boreal and temperate reservoirs but lower than that in tropical reservoirs. Significant spatial variations in CO2 flux were observed at four measured sites, with the largest flux measured at Wushan(221.9 mg CO2/(m2·hr)) and the smallest flux measured at Zigui(88.6 mg CO2/(m2·hr)); these diferences were probably related to the average water velocities at diferent sites. Seasonal variations in CO2 flux were also observed at four sites, starting to increase in January, continuously rising until peaking in the summer(June-August) and gradually decreasing thereafter. Seasonal variations in CO2 flux could reflect seasonal dynamics in pH, water velocity,and temperature. Since the spatial and temporal variations in CO2 flux were significant and dependent on multiple physical, chemical,and hydrological factors, it is suggested that long-term measurements should be made on a large spatial scale to assess the climatic influence of hydropower in China, as well as the rest of the world. | Le Yang Fei Lu Xiaoke Wang Xiaonan Duan Lei Tong Zhiyun Ouyang Hepeng Li | 2013 | Journal of Environmental Sciences2013，25，11： | 7 |
| 2 | A Stochastic Programming Strategy in Microgrid Cyber Physical Energy System for Energy Optimal Operation显示文摘This paper focuses on the energy optimal operation problem of microgrids(MGs) under stochastic environment.The deterministic method of MGs operation is often uneconomical because it fails to consider the high randomness of unconventional energy resources.Therefore,it is necessary to develop a novel operation approach combining the uncertainty in the physical world with modeling strategy in the cyber system.This paper proposes an energy scheduling optimization strategy based on stochastic programming model by considering the uncertainty in MGs.The goal is to minimize the expected operation cost of MGs.The uncertainties are modeled based on autoregressive moving average(ARMA) model to expose the effects of physical world on cyber world.Through the comparison of the simulation results with deterministic method,it is shown that the effectiveness and robustness of proposed stochastic energy scheduling optimization strategy for MGs are valid. | Hepeng Li Chuanzhi Zang Peng Zeng Haibin Yu Zhongwen Li | 2015 | IEEE/CAA Journal of Automatica Sinica2015，2，3： | 7 |
| 3 | Preparation of SiO_2/TiO_2 Janus particles by electrostatic assembly,hydrolysis and calcination显示文摘This paper describes a novel chemical method for preparing SiO_2/TiO_2 Janus particles.First,polystyrene(PSt)/SiO_2 particles with a raspberry-like structure are prepared by electrostatic assembly.The influences of the reaction time of sulfonation and the treatment times of polyelectrolyte solutions(PDADMAC,PSS)on PSt and SiO_2 are investigated with respect to the surface charge density of the particles.SiO_2/TiO_2 Janus particles are then obtained by hydrolysis of butyl titanate on the surface of PSt/SiO_2 particles followed by a calcination process.Particle size analyzer,Zeta potential instrument,FTIR,TEM and SEM are used to characterize the particle size,the amount of charge on the surface of PSt and SiO_2 particles and the compositions and morphologies of PSt/SiO_2,SiO_2/TiO_2 and PSt/SiO_2/TiO_2.The diameters of the PSt,SiO_2,PSt/SiO_2 and SiO_2/TiO_2 particles are 2.0 μm,303 nm,2.7 μm and 330nm,respectively. | Baoliang Zhang Qiuyu Zhang Hepeng Zhang Xinlong Fan Dezhong Yin Xiangjie Li Wei Li | 2013 | Particuology2013，11，5： | 6 |
| 4 | MAS Based Distributed Automatic Generation Control for Cyber-Physical Microgrid System显示文摘The microgrid is a typical cyber-physical microgrid system(CPMS). The physical unconventional distributed generators(DGs) are intermittent and inverter-interfaced which makes them very different to control. The cyber components,such as the embedded computer and communication network,are equipped with DGs, to process and transmit the necessary information for the controllers. In order to ensure system-wide observability, controllability and stabilization for the microgrid,the cyber and physical component need to be integrated. For the physical component of CPMS, the droop-control method is popular as it can be applied in both modes of operation to improve the grid transient performance. Traditional droop control methods have the drawback of the inherent trade-off between power sharing and voltage and frequency regulation. In this paper, the global information(such as the average voltage and the output active power of the microgrid and so on) are acquired distributedly based on multi-agent system(MAS). Based on the global information from cyber components of CPMS, automatic generation control(AGC) and automatic voltage control(AVC)are proposed to deal with the drawback of traditional droop control. Simulation studies in PSCAD demonstrate the effectiveness of the proposed control methods. | Zhongwen Li Chuanzhi Zang Peng Zeng Haibin Yu Hepeng Li | 2016 | IEEE/CAA Journal of Automatica Sinica2016，3，1： | 5 |
| 5 | Key synthesis of magnetic Janus nanoparticles using a modified facile method显示文摘Inorganic/organic poly(methylmethacrylate-acrylic acid-divinylbenzene) iron oxide Janus magnetic nanoparticles(P(MMA-AA-DVB)/Fe_3O_4) with strong magnetic domains and unique surface functionalities were prepared using a solvothermal process.The P(MMA-AA-DVB) nanoparticles were prepared via soapfree emulsion polymerization and used as a precursor for preparing Janus nanoparticles.The morphology and magnetic properties of the magnetic Janus nanoparticles formed were characterized using a laser particle size analyzer,transmission electron microscopy,Fourier transform infrared spectroscopy,vibrating sample magnetometry,and thermogravimetric analysis.The synthesized P(MMA-AA-DVB)/Fe_3O_4 magnetic Janus nanoparticles were characterized by a Janus structure and possessed a stable asymmetric morphology after being dually functionalized.The particle size,magnetic content,and magnetic domain of the P(MMA-AA-DVB)/Fe_3O_4 magnetic Janus nanoparticles were 200 nm,40%,and 25 emu/g,respectively.The formation mechanism of the Janus nanoparticles was also investigated,and the results revealed that the reduction of Fe^(3+) ions and growth of Fe_3O_4 took place on the surface of the P(MMA-AA-DVB) polymeric precursor particles.The size of the Janus particles could be controlled by narrowing the size distribution of the P(MMA-AA-DVB) precursor nanoparticles. | Nisar Ali Baoliang Zhang Hepeng Zhang Wajed Zaman Wei Li Qiuyu Zhang | 2014 | Particuology2014，12，6： | 2 |
| 6 | Preparation and characterization of novel immobilized Fe 3 O 4 @SiO 2 @mSiO 2 –Pd(0) catalyst with large pore-size mesoporous for Suzuki coupling reaction显示文摘 | Wei Li Baoliang Zhang Xiangjie Li Hepeng Zhang Qiuyu Zhang | 2013 | Applied Catalysis A General2013，，： | 1 |
| 7 | Synthesis of PS/Ag asymmetric hybrid particles via phase separation and self-assembly显示文摘This article presents a facile approach to preparation of polystyrene/silver(PS/Ag) asymmetric hybrid particles.In this method,polystyrene/polyglycidyl methacrylate(PS/PGMA)Janus particles were synthesized via internal phase separation triggered by evaporation of dichloromethane(DCM) from PS/PGMA/DCMin water emulsion droplets.Then,the Janus particles were aminated and sequentially carboxylated to obtain PS/PCMA-NHO_2 and PS/PCMA-COOH particles.Ag*self-assembled on the surface of PGMA hemisphere of the functionalized PS/PCMA particles by coordinating with amine/carboxyl.PS/Ag asymmetric hybrid particles with 7.29 wt%of Ag were obtained by reduction of Ag^+.Scanning electron microscopy,energy-dispersive X-ray spectroscopy and transmission electron microscopy results confirmed that Ag was asymmetrically distributed on the surface of polymer particles. | Xinlong Fan Qiuyu Zhang Hepeng Zhang Baoliang Zhang Chunmei Li Xiangjie Li Xingfeng Lei | 2013 | Particuology2013，11，6： | 1 |
| 8 | 显示文摘 | Xu Ke Zhu Lihua Li Jimg Tang Hepeng | 2006 | Electrochimica Acta2006，，52： | 1 |
| 9 | Second Order Derivative Estimates of the Solutions of a Class of Monge-Ampère Equations显示文摘In this paper, we consider a class of Monge-Amp`ere equations in relative differential geometry. Given these equations with zero boundary values in a smooth strictly convex bounded domain, we obtain second order derivative estimates of the convex solutions. | Yadong WU Hepeng LI | 2014 | Journal of Mathematical Research with Applications2014，34，4： | 0 |
| 10 | Erosion Effect of Molten Steel on Carbon Containing Refractories for Continuous Casting显示文摘The erosion resistance of carbon containingrefractories for continuous casting to molten steel wasinvestigated by means of simulative erosion test and examining used refractories. Decarbonization and reaction between molten steel and decarbonization layer are main erosion process of carbon containingrefractories by molten steel. The reactions between molten steel and oxide in refractories determine thethickness of decarbonization layer. A dense layer formation on the working surface contacting withmolten steel during casting will suppress decarbonization and erosion process. | LI Hongxia YANG Bin LIU Guoqi CHENG Hepeng | 2007 | China's Refractories2007，16，2： | 0 |
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