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A coordinated planning strategy of energy storage allocation and line upgrading to increase photovoltaic consumption with lowest planning cost

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Science China Technological Sciences 2025年

作者： Bo ZHANG Yuqi JI Lu ZHANG Wei TANG Xiaohui ZHANG Liang WANG Haoran DING Hanchen mao College of Information and Electrical Engineering China Agricultural University State Grid Heilongjiang Electric Power Research Institute State Grid Heilongjiang Electric Power Company Limited School of Electrical and Information Engineering Zhengzhou University of Light Industry

Random integration of massive distributed photovoltaic (PV) generation poses serious challenges to distribution networks. Voltage violations, line overloads, increased peak–valley differences, and power-flow reversals can occur at different locations, times, and severities. Traditional planning methods such as energy storage (ES) allocation and upgrading of lines may result in poor economics and low equipment utilization. This study proposes a distribution-network planning strategy that coordinates three planning mechanisms:ES allocation to substations and to feeders, and line upgrading. The proposed strategy achieved the lowest annual cost, considering the distribution network problems at different locations, times, and severities. A net load curve description method was first proposed considering economic planning and the uncertain distribution of loads and PVs. Second, a multistage optimization model for ES allocation and line upgrading was established based on the net load curves. Finally, an improved IEEE33 node system was used in the case study. The planning results show that the proposed coordinated planning strategy can address the problems caused by the random integration of massive distributed PVs, improve equipment utilization, and obtain the lowest total annual planning cost.

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Asymmetric interfacial engineering regulated charge distribution on Ru/Ni-N-C sites for efficient hydrogen evolution reaction in alkaline and seawater electrolytes

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Science China Chemistry 2025年

作者： Rui Yu Xi Cao Chengyang Zhu Qingqing Chen Ziyi Yan Binbin Jiang Junjie mao Xianwen Wei Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes College of Chemistry and Materials ScienceAnhui Normal University Anhui Provincial Key Laboratory of Advanced Catalysis and Energy Materials School of Chemistry and Chemical Engineering Anqing Normal University School of Chemistry and Chemical Engineering Anhui University of Technology

Developing highly efficient and cost-effective electrocatalysts for hydrogen evolution reaction（HER） is grandly challenging in alkaline and alkaline seawater electrolytes. Herein, the asymmetric interfacial active sites with Ru nanoparticles and Ni single atoms in Ru/Ni-N-C were designed through a solvothermal-pyrolysis process. Constructing highly asymmetric interfacial active sites with a strong electron delocalization effect significantly improves HER kinetics. As expected, Ru/Ni-N-C requires low overpotentials with around 20 mV at 10 mA cm-2and robust durability over 48 h in alkaline and alkaline seawater *** at 200 mA cm-2, the overpotentials are close to 100 mV in both above electrolytes for Ru/Ni-N-C. Density function theory calculation results suggest that the asymmetric interface between Ru nanoparticle and Ni-N-C could accelerate the dissociation of water molecules and modulate the hydrogen species, consequently improving the HER performances. This work opens a unique approach for constructing advanced materials for energy conversion.

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Matter and Radiation at Extremes 2022年第6期7卷 1-2页

作者： ho-kwang maoa Center for High Pressure Science and Technology Advanced Research 10 Xibeiwang East RoadHaidianBeijing 100094China

The behavior of hydrogen under extreme pressure has continued to attract great interest among the physics,chemistry,materials science,and geoscience communities and has become a major driving incentive for cross-disciplinary advances in novel high-pressure *** has been particularly noticeable this year,and is one of the main themes of this“Special Issue on High Pressure Science 2021.”Hydrogen exhibits a rich physics of multiple phase transitions,including a predicted novel quantum state combining superconductivity and superfluidity upon metallization,and also provides benchmark values for testing theoretical models of quantum solids at high densities.

关键词： dimension driving solids

Key problems of the deep Earth

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National Science Review 2021年第4期8卷 6-6页

作者： ho-kwang mao Center for High Pressure Science and Technology Advanced Research

During Earth’s 4.6-billion-year history, its surface has experienced environmental changes that drastically impacted habitability. The changes have been mostly attributed to near-surface processes or astronomical events with little consideration of Earth’s deep interior. Recent progresses in high-pressure geochemistry and geophysics, however,

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Acknowledgement to reviewers

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Matter and Radiation at Extremes 2021年第2期6卷 87-88页

作者： Michel Koenig Weiyan Zhang ho-kwang mao Laboratoire LULI CNRSCEAEcole PolytechniqueUPMCUniv.Paris 06 Sorbonne UniversitesInstitut Polytechnique de ParisF-91128 Palaiseau CedexFrance Center for Applied Physics and Technology Peking UniversityBeijing 100871China China Academy of Engineering Physics MianyangChina Center for High Pressure Science and Technology Advanced Research ShanghaiChina

In 2020,Matter and Radiation at Extremes(MRE)reached a particularly important milestone when it received its first official impact factor of 2.931,which indicates the high quality of the papers published to *** outstanding success can be attributed to the strong commitment and valuable contributions from all the *** Editors of MRE wish to express their deepest gratitude to the following individuals who generously provided advice on manuscripts as reviewers for MRE in the year of 2020.

关键词： knowledge Extreme individual

Coupled deep-mantle carbon-water cycle: Evidence from lower-mantle diamonds

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The Innovation 2021年第2期2卷 47-53页

作者： Wenzhong Wang Oliver Tschauner Shichun Huang Zhongqing Wu Yufei Meng Hans Bechtel ho-kwang mao Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Department of Geoscience University of Nevada Las VegasLas VegasNV 89154USA CAS Center for Excellence in Comparative Planetology USTCHefeiHefei 230026China Center for High Pressure Science and Technology Advanced Research Shanghai 201203China Advanced Light Source Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA Department of Earth Sciences University College LondonLondon WC1E 6BTUK Earth and Planets Laboratory Carnegie Institution for ScienceWashingtonDC 20015USA

Diamonds form in a variety of environments between subducted crust,lithospheric and deep ***,deep source diamonds with inclusions of the high-pressure H2O-phase ice-VII were *** correlating the pressures of ice-VII inclusions with those of other high-pressure inclusions,we assess quantitatively the pressures and temperatures of their *** show that the iceVII-bearing diamonds formed at depths down to 800±60 km but at temperatures 200–500 K below average mantle temperature that match the pressure-temperature conditions of decomposing dense hydrous mantle *** work presents strong evidence for coupled recycling of water and carbon in the deep mantle based on natural samples.

关键词： diamond deep mantle water and carbon cycle first-principles calculations

Structural stability of methane hydrate at high pressures

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Geoscience Frontiers 2011年第1期2卷 93-100页

作者： I.-Ming Chou Russell J.Hemley ho-kwang mao 954 National Center U.S.Geological SurveyRestonVA 20192USA Geophysical Laboratory Carnegie Institution of WashingtonWashingtonDC 20015USA

The structural stability of methane hydrate under pressure at room temperature was examined by both in-situ single-crystal and powder X-ray diffraction techniques on samples with structure types I, II, and H in diamond-anvil ceils. The diffraction data for types II （slI） and H （sH） were refined to the known structures with space groups Fd3m and P63/mmc, respectively. Upon compression, sl methane hydrate transforms to the sll phase at 120 MPa, and then to the sH phase at 600 MPa. The slI methane hydrate was found to coexist locally with sI phase up to 500 MPa and with sH phase up to 600 MPa. The pure sH structure was found to be stable between 600 and 900 MPa. Methane hydrate decomposes at pressures above 3 GPa to form methane with the orientationally disordered Fm3m structure and ice VII （Pn3m）. The results highlight the role of guest （CH4）-host （H2O） interactions in the stabilization of the hydrate structures under pressure.

关键词： Methane hydrate Structural stability High pressure

Self-synchronization of reinjected droplets for highefficiency droplet pairing and merging

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Microsystems & Nanoengineering 2023年第2期9卷 181-192页

作者： Lang Nan Tianjiao mao ho Cheung Shum Advanced Biomedical Instrumentation Centre Hong Kong Science ParkShatinNew TerritoriesHong KongChina Department of Mechanical Engineering The University of Hong KongPokfulam RoadHong KongChina

Droplet merging serves as a powerful tool to add reagents to moving droplets for biological and chemical ***,unsynchronized droplet pairing impedes high-effciency ***,we develop a microfluidic design for the self-synchronization of reinjected droplets.A periodic increase in the hydrodynamic resistance caused by droplet blocking a T-junction enables automatic pairing of *** inducing spacing,the paired droplets merge downstream under an electric *** blockage-based design can achieve a 100%synchronization efficiency even when the mismatch rate of droplet frequencies reaches 10%.Over 98%of the droplets can still be synchronized at nonuniform droplet sizes and fluctuating reinjection flow ***,the droplet pairing ratio can be adjusted flexibly for on-demand sample *** this system,we merge two groups of droplets encapsulating enzyme/substrate,demonstrating its capacity to conduct multi-step *** also combine droplet sorting and merging to coencapsulate single cells and single beads,providing a basis for high-efficiency single-cell *** expect that this system can be integrated with other droplet manipulation systems for a broad range of chemical and biological applications.

关键词： field merge spacing

Intelligent interaction system based on multimodal conformal triboelectric nanogenerator patch for disabled sports and life

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Science China Technological Sciences 2025年

作者： Yuzhang WEN Mengqi ZHANG Zhenning XIE Zida AN Bing LIU Fengxin SUN Tianming ZHAO Zuojun YU Fei WANG Yupeng mao Physical Education Department Northeastern University(Shenyang) Faculty of Robot Science and Engineering Northeastern University Criminal Investigation Police University of China State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences China Ice Sports College Beijing Sport University

Intelligent interaction technology based on advanced sensing units has become a research hotspot. In this paper, an intelligent interaction system (IIS) based on a multimodal conformal triboelectric nanogenerator patch (MCTP) is reported for sports monitoring and life promotion of the disabled. This IIS consists of a cloud-based smart sports recognition program and a smart life application. The porous micro-reinforced structure of polyurethane (PU) Sponge&Ecoflex, and the surface modification of PTFE by coating it with MXene endows the MCTP with excellent electrical properties. It shows good angle and force sensitivities of 1.1 V/°and 1.61 V/N, respectively, and has an ultra-fast response time of 15 ms, meeting the needs of human motion monitoring. The MCTP can also capture the mechanical energy, producing a maximum output power of 139μ*** with the commercial inertial measuring unit (IMU), the MCTP shows better consistency in human joint angle sensing. A precise analysis of wheelchair curling sports monitoring points is achieved by combining the MCTP and the human anatomy model. The cloud-based smart sports recognition program utilizes machine learning to achieve visual feedback on the three throwing technologies of draw, takeout and clearing. In addition, the developed smart life application uses a highsensitivity MCTP-sensor array design to achieve a variety of smart home interactions through simple finger touches. Overall,the IIS integrates the three major functions of smart sports sensing, energy capture, and smart home control, providing important application prospects in the fields of smart sports and human-computer interaction for the disabled.

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