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Scientific land greening under climate change: Theory, modeling, and challenges

Advances in Climate Change Research 2024年第5期15卷 894-913页

作者： Jia-Na CHEN Zai-Chun ZHU Sen CAO Peng-Jun ZHAO Pei LIU Da-Jing LI Wei-Min WANG Yue CHEN School of Urban Planning and Design Shenzhen Graduate SchoolPeking UniversityShenzhen 518055China Key Laboratory of Earth Suface System and Human-Earth Relations of Ministry of Natural Resources of China Shenzhen Graduate SchoolPeking University Shenzhen 518055China Guangdong Urban-Rural Planning and Design Research Institute Technology Group Co. Lid.Guangzhou 510290China Shenzhen Ecological and Environmental Monitoring Centerof Guangdong Province Shenzhen 518049China Guangdong Greater Bay Area Change and Comprehensive Treatment of Regional Ecology and EnvironmentNational Observation and Research StationShenzhen 518049China State Environmental Protection Scientific Observation and Research Station for Ecology and Environment of Rapid Urbanization Region Shenzhen 518049.China

Anthropogenic land greening is a vital strategy to combat the global warming ***,the changing external environment and endowment factors may constrain the effectiveness of land *** remains unclear how to quantify and optimize land greening strategies *** article reviewed the theoretical foundations of land greening,pointing out that climate governance and human settlement quality improvement have gradually become the two core objectives of land greening since the 2oth ***-source and multi-scale experimental and observational surveys are important techniques for detecting and evaluating long-term land greening in the context of climate change,especially by forming experimental and observational *** theoretical mechanisms of interactions among climate,humans,and vegetation were also *** modeling approaches,hybrid modeling based on Earth system coupling theory may be the most promising but challenging *** main challenges of scientific land greening were also discussed,including knowledge gaps related to land greening mechanisms,unclear multifaceted effects of land greening,lack of forward-looking quantitative assessment,and difficulties in evaluating synergies and trade-offs among assessment *** on these,a strategic framework was proposed,including systematic observation,mechanism research,expectation assessment,and scientific planning for scientific greening programs in the Guangdong-Hong Kong-Macao Greater Bay *** review underscored the importance of proactively implementing land greening programs and provided guidelines for scientific greening based on cutting-edge theory and methods.

关键词： Land greening Climate change Human-Earth relations Earth system model Sustainable development goals

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Corrosion Behavior of Micro-Arc Oxidation Coating on Zirconium Alloy in Superheated Steam Condition

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SSRN 2022年

作者： Li, Zheng-Yang Zheng, Mei-Yin Yang, Zhong-Bo Ren, Quan-Yao Cai, Zhen-Bing Jiao, Yong-Jun Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Tribology Research Institute Key Lab of Advanced Technologies of Materials Southwest Jiaotong University Chengdu610031 China

The corrosion behavior of MAO coating on Zr alloy was investigated in 400 ºC/10.3 MPa condition. The surface morphology, phase composition, and element distribution of MAO coating were analyzed. The results indicate that the oxide layer on MAO coating presents fewer cracks and pores than Zr alloy, because the high compressive stress can stabilize the t-ZrO2 and restrain the phase transformation, thus reducing the volume expansion and future decreasing defect. Based on the XRD, Raman mapping, SEM, XPS, and TEM results, the formation mechanism of t-ZrO2 and phase transformation process of MAO coating in superheated steam condition was summarized. © 2022, The Authors. All rights reserved.

关键词： Phase transitions

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A Method for Hazard Analysis of Floating Nuclear Power Plant Subjected to Ship Collision

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SSRN 2022年

作者： Xiao, Jinxiong Peng, Changhong Zhang, Hang School of Nuclear Science and Technology University of Science and Technology of China No.96 Jinzhai Road Baohe District Hefei230026 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Sichuan Chengdu610213 China

Recently, a technology called floating nuclear power plant (FNPP) has been developed around the world to maximize the use of ocean and nuclear energy. The FNPP is required to investigate the impact of a ship collision during its service period. A rapid and accurate approach for assessing the ship collision hazard is proposed in this work. To begin with, the annual collision frequencies of four different ship types are calculated using the improved collision frequency formula, with standby and supply vessel frequencies of [[EQUATION]] and [[EQUATION]] , respectively, and passing and fishing vessel frequencies of less than [[EQUATION]] . Subsequently, a combination of finite element numerical simulation, back propagation (BP) neural network, and Monte Carlo simulation (MCS) is used to derive the probability density distribution of collision damage measures. Finally, by integrating the annual collision frequency and probability distribution, this paper analyzes the hazard of ship collision with FNPP and derives the hazard curve. © 2022, The Authors. All rights reserved.

关键词： Nuclear power plants

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Influence of Different Factors on Fault Current Under DC Side Fault of Photo voltaic Grid Connected system

Influence of Different Factors on Fault Current Under DC Sid...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Yongyi Luo Xianguo Qing Renyong Peng Yuzhao Huangfu Ao Cui Zhaosu Wang Zhiqiang Zhang Ziheng Peng Chengyu Liao Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

ISBN: (纸本)9781665434263

Modular multilevel converter (MMC) has many advantages, such as low loss, flexible control and so on, which has been widely used in photovoltaic grid connected system. However, the photovoltaic output has some instability, and the damping of the flexible DC system is also low, which puts forward a severe test for the stable operation of the power grid. Firstly, this paper describes the basic structure of the photovoltaic system connected by MMC. Secondly, the photovoltaic grid connected system model based on PSCAD illustrates the fault current characteristics under DC side fault, and simulates and analyzes the influence of different factors in the system on the fault current.

关键词： Photovoltaic systems Analytical models Multilevel converters system integration Power grids Internet Circuit faults

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An Efficiency Optimization Control Method for Three-Phase Interleaved DC-DC Converter

An Efficiency Optimization Control Method for Three-Phase In...

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IEEE Asia Power and Energy Engineering Conference (APEEC)

作者： Jinxin Wang Renyong Peng Chen Cai Haitao Yu Meiyuan Chen Yiyi Liu Ke Wu Shihan Tang Hongyang Wei Jie Chen Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

Because of the environmental friendliness of electric vehicles, research on electric vehicles has become a hot spot in recent years. How to charge electric vehicles faster is critical to the widespread use of electric vehicles. Electric vehicle integrated power unit can use bidirectional DC-DC converter for driving to achieve integrated charging. In order to improve the power density and efficiency of the integrated system, the bidirectional DC-DC for electric vehicle driving uses three-phase interleaved parallel technology. This paper proposes a method to select different interleaved phase numbers according to different output powers of the converter to improve the working efficiency of three-phase interleaved parallel DC-DC converters. This method improves the efficiency of the three-phase interleaved parallel converter under light load and widens the high-efficiency working area of the converter. Finally, simulations and experimental results are conducted to validate the efficiency of the design.

关键词： Power system measurements Simulation DC-DC power converters Switches Electric vehicles Software Electron tubes

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Virtual Structure Method UAV Distributed Formation Control Based on Improved Super-Twisting Sliding Mode 3rd

Virtual Structure Method UAV Distributed Formation Control B...

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3rd International Conference on Autonomous Unmanned systems, ICAUS 2023

作者： Zhang, Hengmao Ding, Yibo Chi, Xianbin Yue, Xiaokui School of Astronautics Northwestern Polytechnical University Xi’an710072 China National Key Laboratory of Aerospace Flight Dynamics Northwestern Polytechnical University Xi’an710072 China Research & Development Institute of Northwestern Polytechnical University in Shenzhen Sanhang Science & Technology Building No. 45th Gaoxin South 9th Road Nanshan District Shenzhen City518063 China General Design Institute of Hubei Aerospace Technology Academy Wuhan430040 China

ISBN: (纸本)9789819710829

In the UAV formation control, the virtual structure method no longer relies on the dominance of the UAV leader who may have faults, but defines a virtual center or virtual rigid body. The UAVs only need to maintain relative position in the virtual rigid body coordinate system. However, the communication and calculation are concentrated in the virtual center, resulting in excessive local communication pressure. Besides, the formation effect is not satisfying when the number of UAVs is large. Therefore, this paper considers the combination of distributed communication strategy and virtual structure method, and an improved formation controller is proposed based on the super-twisting algorithm. With two fast integer power linear terms introduced, the controller has a better effect of suppressing chattering and speeding up the convergence of tracking errors. Furthermore, the sign function is replaced by the saturation function with variable boundary layer. Different from fixed boundary layer, the thickness of variable one will decrease gradually as the tracking errors approach the sliding surface, which enables to diminish chattering while not influencing the control effect. In addition, the improved formation controller in this paper can ensure that the velocity and acceleration tracking errors converge to zero so the consistency of UAV clustering can be achieved. © Beijing HIWING Scientific and Technological Information Institute 2024.

关键词： Unmanned aerial vehicles (UAV)

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Photocatalytic Degradation of Tetracycline Over Bimetallic Layered Double Hydroxides-Mxenes Heterostructures Under Visible Light

SSRN

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SSRN 2024年

作者： Yao, Jixin Liu, Yong Tong, Xiaowei Lu, Shibin Meng, Ying Li, Guang Anhui Province Key Laboratory of Simulation and Design for Electronic Information System Universities Joint Key Laboratory of Photoelectric Detection Science and Technology in Anhui Province Hefei Normal University Hefei230601 China School of Materials Science and Engineering Anhui Key Laboratory of Information Materials and Devices Key Laboratory of Structure and Functional Regulation of Hybrid Materials Ministry of Education Institute of Physical Science and Information Technology Anhui University Hefei230601 China School of Electronic Engineering Huainan Normal University Huainan232038 China

Layered double hydroxides (LDHs) are widely used in photocatalytic degradation of antibiotic pollutants under ultraviolet (UV)-light, but their efficiency under visible light is hampered by large band gaps and layer agglomeration. To address these challenges, we have successfully developed innovative bimetallic NiCo LDHs-MXenes heterostructures (LDHs-MXenes) for enhanced degradation of tetracycline (TC) pollutants under visible light conditions. As-prepared LDHs-MXenes photocatalysts (20 mg) show exceptional performance, achieving ~97.4% TC degradation efficiency (20 mg L-1, 100 mL) within just 50 minutes under a 300 W Xe lamp. This significant enhancement underscores the synergistic effects derived from the combination of LDHs and MXenes nanosheets. © 2024, The Authors. All rights reserved.

关键词： Heterojunctions

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Experimental Study on the Characteristics of Annular Fluid Film in a Locally Deformed Narrow Rectangular Channel

SSRN

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SSRN 2024年

作者： Wang, Fenze Ren, Quanyao Liu, Haidong Xiao, Yi Chen, Deqi Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing University Ministry of Education Chongqing400044 China Department of Nuclear Engineering and Technology School of Energy and Power Engineering Chongqing University Chongqing400044 China Science and Technology on Reactor System Design Technology Laboratory Chengdu610041 China Liangjiang International College Chongqing University of Technology Chongqing401135 China Chongqing Research Institute of HIT Chongqing401151 China School of Flight Technology Civil Aviation Flight University of China Sichuan618307 China China

The study of the characteristics of the annular flow film in the narrow rectangular channel under the localized deformation can provide a research basis for the heat and mass transfer and the hydrodynamic characteristics of the locally deformed narrow flow channel. In this study, the annular flow liquid film characterization experiments are carried out in a narrow rectangular channel without local deformation, ellipsoidal deformation and pillow-shaped deformation, and different annular flow liquid film parameters liquid film thickness, disturbance wave height, and disturbance wave wavelength are obtained by high-speed camera acquisition system and intelligent image processing technology. Analyze the effects of flow conditions and local deformation on the liquid film parameters of each annular flow. Local deformation impact factor functions for liquid film thickness, disturbance wave height, and disturbance wave wavelength are obtained. The error of the impact factor function is within ±30%. © 2024, The Authors. All rights reserved.

关键词： Liquid films

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A compact fluorescence/circular dichroism dual-modality probe for detection, differentiation, and detoxification of multiple heavy metal ions via bond-cleavage cascade reactions

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Chinese Chemical Letters 2021年第12期32卷 3876-3881页

作者： Junwei Chen Na Wang Hongjuan Tong Chao Song Huijuan Ma Yajun Zhang Feng Gao Huan Xu Wei Wang Kaiyan Lou State Key Laboratory of Bioengineering Reactor.Shanghai Key Laboratory of New Drug Design and Shanghai Key Laboratory of Chemical BiologySchool of PharmacyEast China University of Science & TechnologyShanghai 200237China School of Pharmacy Collaborative Innovation Center of Green Manufacturing Technology for Traditional Chinese Medicine in Shaanxi ProvinceShaanxi Institute of International Trade&CommerceXi'an 712046China Department of Pharmacology and Toxicology and BIO5 Institute University of ArizonaTucson AZ 85721-0207United States

Selective detection of multiple analytes in a compact design with dual-modality and theranostic features presents great challenges. Herein, we wish to report a coumarin-thiazolidine masked D-penicillamine based dual-modality fluorescent probe COU-DPA-1 for selective detection, differentiation, and detoxification of multiple heavy metal ions(Ag^(+), Hg^(2+), Cu^(2+)). The probe shows divergent fluorescence(FL)/circular dichroism(CD) responses via divergent bond-cleavage cascade reactions(metal ion promoted C-S cleavage and hydrolysis at two distinctive cleavage sites): FL “turn-off” and CD “turn-on” for Ag+(no hydrolysis), FL “turn-on” and CD “turn-off” for Hg^(+)(imine hydrolysis), and FL “self-threshold ratiometric” and CD “turn-off” for excess Cu^(2+)(lactone and imine hydrolysis), providing the first example of a fluorescence/CD dual-modality probe for multiple species with complimentary responses. Moreover, the bond-cleavage cascade reactions also lead to the formation of D-penicillamine heavy metal ion complexes for potential detoxification treatments.

关键词： Fluorescent probe Circular dichroism Heavy metal ions Dual-modality Detoxification Cascade reaction Divergent responses

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Effect of the Graphene Oxide Incorporation on the Morphology, Corrosion Resistance and Fatigue Performance of Micro-Arc Oxidation Coating on Magnesium Alloy

SSRN

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SSRN 2024年

作者： Tan, Yansong Liu, Xin Sun, Xiaohao Gao, Lilan Liu, Debao Zhang, Chunqiu Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Cont rol School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineerin g Education Tianjin University of Technology Tianjin300384 China School of Materials Science and Engineering Tianjin University of Technology Tianjin300384 China

Magnesium (Mg) alloy has great potential in biomedical applications, but the rapid corrosion rate which mismatches with bone reconstruction rate limits its clinical use. In this study, the graphene oxides (GO) were added into alkaline electrolyte solution during micro-arc oxidation (MAO) process, aiming to form a corrosion resistant surface coating on Mg alloy. By changing the concentration of GO, the coatings' morphology, composition, corrosion resistance, and fatigue property were compared to reveal the strengthening mechanism and find out the optimal graphene concentration. The results show that the MAO coating is composed of MgO, Mg2SiO4, Mg3(PO4)2 and GO. The added GO exhibits excellent adsorption property in the MAO process, reducing the intermolecular gap, thereby improving densification and obturation of the MAO coating. The surface morphology of MAO coating initially improves with increasing GO content, but then deteriorates, reaching its best quality at 0.4 g/L. Compared to MAO samples without GO, the samples with 0.4g/L GO not only have lower corrosion current density of 5.226 μA/cm2, but also show higher fatigue lives both before and after pre-corrosion. This study offers a promising approach to enhance the corrosion resistance and fatigue performance of Mg alloy by applying a GO-strengthened MAO coating onto its surface. © 2024, The Authors. All rights reserved.

关键词： Magnesium alloys

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