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Journal of Energy Chemistry 2025年第1期100卷 621-627页

作者： Fei Lv Longjie Liu Jiazhe Wu Pengfei Wang Lixia Pan dengwei Jing Yubin Chen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Combining water electrolysis and rechargeable battery technologies into a single system holds great promise for the co-production of hydrogen （H2） and ***,the design and development of such systems is still in its ***,an integrated hydrogen-oxygen （O2）-electricity co-production system featuring a bipolar membrane-assisted decoupled electrolyzer and a Na-Zn ion battery was established with sodium nickelhexacyanoferrate （NaNiHCF） and Zn2+/Zn as dual redox *** decoupled electrolyzer enables to produce H2and O2in different time and space with almost 100%Faradaic efficiency at 100 mA ***,the charged NaNiHCF and Zn electrodes after the electrolysis processes formed a Na-Zn ion battery,which can generate electricity with an average cell voltage of 1.75 V at 10 m A *** connecting Si photovoltaics with the modular electrochemical device,a well-matched solar driven system was built to convert the intermittent solar energy into hydrogen and electric energy with a solar to hydrogen-electricity efficiency of 16.7%,demonstrating the flexible storage and conversion of renewables.

关键词： Hydrogen Electricity Decoupled water electrolyzer Na-Zn ion battery Solar energy

State-of-the-art progress in overall water splitting of carbon nitride based photocatalysts

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Frontiers in Energy 2021年第3期15卷 600-620页

作者： Bing LUO Yuxin ZHAO dengwei JING School of Chemical Engineering and Technology Xi’an Jiaotong UniversityXi’an 710049China International Research Center for Renewable Energy and State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

Converting solar energy into hydrogen(H_(2))by photocatalytic water splitting is a promising approach to simultaneously address the increasing energy demand and environmental *** decade has passed since the discovery of photo-induced water splitting phenomenon on TiO_(2)photoanode,while the solar to H_(2) efficiency is still around 1%,far below the least industrial ***,developing efficient photocatalyst with a high energy conversion efficiency is still one of the main tasks to be *** carbon nitride(g-C_(3)N_(4))is just such an emerging and potential ***,in this review,the state-of-the-art advances in g-C_(3)N_(4)based photocatalysts for overall water splitting were summarized in three sections according to the strategies used,and future challenges and new directions were discussed.

关键词： photocatalysis overall water splitting carbon nitride hydrogen

Enhanced efficiency in Concentrated Parabolic Solar Collector(CPSC) with a porous absorber tube filled with metal nanoparticle suspension

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Green Energy & Environment 2018年第2期3卷 129-137页

作者： Mohammad Hatami Jiafeng Geng dengwei Jing Mechanical Engineering Department Esfarayen University of Technology (EUT) International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong University

In this study, effects of different nanoparticles and porosity of absorber tube on the performance of a Concentrating Parabolic Solar Collector(CPSC) were investigated. A section of porous-filled absorber tube was modeled as a semi-circular cavity under the solar radiation which is filled by nanofluids and the governing equations were solved by FlexPDE numerical software. The effect of four physical parameters, nanoparticles type, nanoparticles volume fraction(φ), Darcy number(Da) and Rayleigh number(Ra), on the Nusselt number(Nu) was discussed. It turns out that Cu nanoparticle is the most suitable one for such solar collectors, compared to the commonly used Fe_3O_4, Al_2O_3, TiO_*** the increased addition of Cu nanoparticles all the parameters φ, Da and Ra shows a significant increase against the Nu, indicates the enhanced heat transfer in such cases. As a result, low concentration of Cu nanoparticle suspension combined with porous matrix was supposed to be beneficial for the performance enhancement of concentrating parabolic solar collector.

关键词： Concentrating parabolic solar collector Porous absorber tube Nanofluid Nusselt number Finite Element Method

RECENT TRENDS OF TEMPERATURE AND PRECIPITATION DISTURBED BY LARGE-SCALE RECLAMATION IN THE SANGJIANG PLAIN OF CHINA

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Chinese Geographical Science 2003年第4期13卷 317-321页

作者： YANMin-hua dengwei CHENPan-qint NortheastInstituteofGeograpyandAgriculturalEcology ChineseAcademyofSciencesChangchun130012P.R.China BureauofScienceandTechnologyforResourcesandEnvironment ChineseAcademyofSciences.Beijing100864P.R.China

The regional observed temperature and precipitation changes and their abruptjumps disturbed by large-scale reclamation in the Sanjiang Plain, Northeast China were studied. Meanannual temperature of the region was tending to go up and has increased by 1.2-2.2℃ over the past50 years. A warming jump of mean annual temperature of the region occurred in the 1980s, which hadan increasg amplitude of 0.9℃. Linear tendency rates of annual precipitation were negative in mostof the region. The maximum of annual precipitation decrease was 155.8mm over the past 50 years. Anabrupt decrease of regional annual precipitation happened in the middle of the 1960s, which had adecrease of 102.1mm. Based on the fact of climatic change of the Sanjiang Plain over the past 50years, it is held that the region had larger warming amplitude than that of the surrounding areas inthe recent years, which resulted from the large-scale reclamation of various kinds of wetlands.

关键词： temperature precipitation warming jump large-scale reclamation thesanjiang plain

Hydrodynamic and heat transfer properties of magnetic fluid in porous medium considering nanoparticle shapes and magnetic field-dependent viscosity

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Chinese Journal of Chemical Engineering 2020年第2期28卷 329-339页

作者： Mohsen Izadi Masoud Javanahram Seyed Mohsen Hashem Zadeh dengwei Jing Mechanical Engineering Department Lorestan UniversityKhorramabadIran Mechanical Engineering Department Islamic Azad UniversityBushehrIran Department of Mechanical Engineering Shahid Chamran University of AhvazIran School of Energy and Power Engineering State Key Lab of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityXi'an 710049China

The purpose of this paper is to study the characteristics of the combined convection heat transfer and a micropolar nanofluid flow passing through an impermeable stretching sheet in a porous *** nanofluid flow field is affected by a magnetic field perpendicular to the *** dynamic viscosity of the micropolar nanofluid changes under the influence of the magnetic *** continuity,linear momentum,angular momentum,and energy equations are first simplified using the order of magnitude technique that,along with the applied boundary conditions and the definition of the appropriate parameters,are transferred to the similarity space using the similarity *** the resulting equations are solved using the Runge–Kutta *** distinction of the macroscale and microscale flow fields and temperature fields resulting from different nanoparticle shapes was *** the Hartmann number,the vortex viscosity parameter,the magnetic parameter,the nanoparticle volume fraction,and the permeability parameter of the porous media increased the surface friction on the *** the vortex viscosity parameter,the magnetic parameter,and the volume fraction of the nanoparticles increases the Nusselt number.

关键词： MHD-combined convection Porous media Magnetic micropolar nanofluid

Extended Quark Potential Model From Random Phase Approximation

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Communications in Theoretical Physics 2002年第9期37卷 327-332页

作者： dengwei－Zhen CHENXiao－Lin 等 DepartmentofPhysics PekingUniversityBeijing100871China

The quark potential model is extended to include the sea quark excitation using the random phase approximation. The effective quark interaction preserves the important QCD properties — chiral symmetry and confinement simultaneously. A primary qualitative analysis shows that the π meson as a well-known typical Goldstone boson and the other mesons made up of valence quark pair such as the ρ meson can also be described in this extended quark potential model.

关键词： quark model random phase approximation chiral symmetry

Water Requirements and Irrigation Scheduling of Spring Maize Using GIS and CropWat Model in Beijing-Tianjin-Hebei Region

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Chinese Geographical Science 2007年第1期17卷 56-63页

作者： FENG Zhiming LIU dengwei ZHANG Yuehong Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

Due to the over use of available water resources, it has become very important to define appropriate strategies for planning and management of irrigated farmland. In this paper, Beijing-Tianjin-Hebei (Jing-Jin-Ji) region was chosen as the case study area for its special political and economic status and its severe water problem. To achieve effective planning, the information about crop water requirements, irrigation withdrawals, soil types and climatic conditions were obtained in the study area. In the meantime, a GIS method was adopted, which extends the capabilities of the crop models to a regional level. The main objectives of the study are: 1) to estimate the spatial distribution of the evapotranspiration of spring maize; 2) to estimate climatic water deficit; 3) to estimate the yield reduction of spring maize under different rainfed and irrigated conditions. Based on the water deficit analysis, recommended supplemental irrigation schedule was developed using CropWat model. Compared to the rainfed control, the two or three times of supplemental water irrigated to spring maize at the right time reduced the loss of yield, under different scenarios.

关键词： spring maize climatic water deficit irrigation schedule

Solar photocatalytic energy conversion

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Science Bulletin 2017年第9期62卷 597-598页

作者： Xuxu Wang dengwei Jing Meng Ni State Key Laboratory of Photocatalysis on Energy and Environment Research Institute of HotocatalysisCollege of ChemistryFuzhou UniversityFuzhou 350l16China International Research Center for Renewable Energy Xi'an Jiaotong UniversityXi'an 710049China Environmental Energy Research Group Research Institute for Sustainable Urban Development(RISUD)The Hong Kong Polytechnic UniversityHong KongChina

Development of clean and renewable energy sources is an inevitable choice of human society to address the energy shortage and environmental deterioration problems *** has been recognized as the most ideal and clean fu... 详细信息

关键词： BDD OER

CHARACTERISTICS OF ZONAL ANOMALY OF ANNUAL PRECIPITATION IN THE NORTHEASTERN CHINA

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Chinese Geographical Science 2004年第4期14卷 320-325页

作者： YANMin-hua dengwei CHENPan-qin LIANGLi-qiao NortheastInstituteofGeographyandAgriculturalEcology ChineseAcademyofSciencesChangchun130012P.R.China／／GraduateSchoolofChineseAcademyofSciencesBeijing100039P.R.China BureauofScienceandTechnologyforResourcesandEnvironment ChineseAcademyofScieneesBeijing100864P.R.China

The characteristics of zonal anomaly and change rule of temporal distribution of annual precipitation in the northeastern China are revealed in this paper with EOF (Empirical Orthogonal Function) and REOF (Rotated Empirical Orthogonal Function) methods and results are drawn in the standard relief maps with GIS technology for practical application. Data used in the study were obtained from 208 meteorological stations over the northeastern China from 1961 to 2001. EOF results show that the first 3 loading vectors could give entire spatial anomaly structure of annual precipitation. In the Northeast Plain including the Songneng Plain and the Liaohe Plain, there is a regional compatibility (whether wet or dry) of annual precipitation change and this precipitation pattern has occurred since the late 1980s to the present. There also exist annual precipitation patterns of wet (or dry) in south and dry (or wet) in north and wet (or dry) in east and dry (or wet) in west. REOF results display 8 principal precipitation anomaly areas by the first 8 rotated loading vectors: the west plain, the Liaodong hills, the Sanjiang Plain, the Liaoxi hills, the Changbai Mountains, the Hulun Buir Plateau, the southwest plateau and the Liaodong Peninsula.

关键词： annual precipitation northeastern China zonal anomaly precipitation characteristics

Investigation of sensitivity of the ultra-high frequency partial-discharge detection technology for micro-crack in epoxy insulator in GIS

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High Voltage 2020年第6期5卷 697-703页

作者： Jiangrong Cheng Yang Xu dengwei Ding Weidong Liu Department of Electrical Engineering Tsinghua UniversityBeijingPeople's Republic of China Sichuan Energy Internet Research Institute Tsinghua UniversityChengduPeople's Republic of China

The ultra-high frequency(UHF)method has been widely used in a gas-insulated system(GIS)for partial-discharge detection,and many achievements have been *** addition,many studies based on artificial defects have been made to confirm its ***,the UHF method is generally believed to be sufficiently effective for GIS ***,in practical application,the authors find that for some micro-crack discharge in GIS insulator,the UHF method has low *** fully study the characteristics of the micro-crack discharge in the GIS insulator,an experiment is conducted in this study using an actual post insulator with a micro-crack *** current signal based on IEC 60270 standard and the radio-frequency electromagnetic signal is simultaneously measured for thorough *** results show that some submillimetre crack defects may occur in the GIS *** discharge is mainly presented as glow discharge,and the discharge signal frequency usually cannot reach the UHF band;thus,it cannot be effectively detected by the UHF *** study provides complementary information to the applicability of the UHF method and inspires further study of the GIS insulator and its monitoring technology.

关键词： insulator crack high