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Evolution of Transitional Institutions for Urban Land Redevelopment in China——Case in Guangzhou

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Chinese Geographical Science 2009年第1期19卷 1-7页

作者： liu xuan School of Geography and Planning SUN Yat-Sen University Guangzhou 510275 China

Building effective institutions for markets is a great challenge to China's transitional economy. China's experience in establishing urban land markets is characterized by trial and error and the gradual evolution of transitional institutions. Based on archive data and interviews in a neighborhood(Jinhuajie) of Guangzhou,this research reveals that China's land redevelopment in the past two decades has followed an approach of partial and gradual reform,which was structured by the gradual evolution of transitional institutions to speed up local land redevelopment within the existing property rights system. Transitional institutions,including highly compensated residents' land use rights,in-kind land lease payment,flexible control on development rights of developers and short-term actual ownership of work units,are generated by the local government sequentially to dispel existing land use rights of different land users and make further development be able to follow market mechanisms.

关键词： land redevelopment evolution of transitional institutions property rights Guangzhou

A new track for antibacterial treatment:Progress and challenges of using cytomembrane-based vesicles to combat bacteria

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Particuology 2023年第7期78卷 136-146页

作者： Jiaxuan Xie xuan liu Gang liu State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics National Institute of Diagnostics and Vaccine Development in Infectious DiseasesSchool of Life SciencesSchool of Public HealthXiamen UniversityXiamen361102China Center for Molecular Imaging and Translational Medicine School of Public HealthXiamen UniversityXiamen361102China

The emergence and re-emergence of antibiotic-resistant bacteria,especially superbugs,are leading to complicated infections that are increasingly difficult to ***,novel alternative antimicrobial therapies are urgently needed to reduce the morbidity and mortality caused by antibiotic *** development of biomimetic-based therapy is expected to provide innovative means for addressing this challenging *** a kind of novel biomaterial,cytomembrane-based vesicles(MVs)continue to receive considerable attention in antimicrobial therapy owing to their inherent biocompatibility,design flexi-bility,and remarkable ability to interact with biological molecules or the surrounding *** remarkable cell-like properties and their inherent interaction with pathogens,toxins,and the immune system underlie MVs-based functional protein therapy and targeted delivery to develop advanced therapeutic strategies against bacterial *** review provides a fundamental under-standing of the characteristics and physiological functions of cytomembrane-based vesicles,focusing on their potential to combat bacterial infections,including detoxification,immune modulation,antibiotics delivery,and physical *** addition,the future possibilities and remaining challenges for clinically implementing MVs in the field of antibacterial treatment are discussed.

关键词： Cytomembrane-basedvesicles Bacterial resistance Antibacterial therapy Drug delivery

Security Constrained Unit Commitment with Extreme Wind Scenarios

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Journal of Modern Power Systems and Clean Energy 2020年第3期8卷 464-472页

作者： Xin Zhu Zongchao Yu xuan liu College of Electrical and Information Engineering Hunan UniversityChangsha 410082China

The rapid development of economy and society stimulates the increase of power demand. Wind power has received great attention as a typical renewable energy, and the share of wind power is continually increasing in recent ***, the high integration of wind power brings challenges to the secure and reliable operation of power grid due to the intermittent characteristic of wind power. In order to solve the operation risk caused by wind power uncertainty, this paper proposes to solve the problem of stochastic security-constrained unit commitment(SCUC) by considering the extreme scenarios of wind power output. Firstly, assuming that the probability density distribution of wind power approximately follows a normal distribution, a great number of scenarios are generated by Monte Carlo(MC) simulation method to capture the stochastic nature of wind power output. Then, the clustering by fast search and find of density peaks(CSFDP) is utilized to separate the generated scenarios into three types: extreme, normal and typical scenarios. The extreme scenarios are identified to determine the on/off statuses of generators, while the typical scenarios are used to solve the day-ahead security-constrained economic dispatch(SCED) problem. The advantage of the proposed method is to ensure the robustness of SCUC solution while reducing the conservativeness of the solution as much as *** effectiveness of the proposed method is verified by IEEE test systems.

关键词： Monte Carlo(MC)simulation security-constrained unit commitment(SCUC) security-constrained economic dispatch(SCED) wind power

Electrochemical and corrosion behaviors of the wrought Mg–Y–Zn based alloys with high Y/Zn mole ratios

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Journal of Magnesium and Alloys 2021年第4期9卷 1427-1435页

作者： xuan liu Zijian Zhu Jilai Xue School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The electrochemical behaviors and corrosion resistance of the wrought Mg–Y–Zn based alloys with high Y/Zn mole ratio have been investigated in *** results show that the corrosion resistance of the investigated Mg–Y–Zn based alloys are dependent on the modified arrangement of LPSO phase by adjusting Y/Zn mole *** the Y/Zn mole ratio not only greatly decreases the size of LPSO phase plates,but also leads to the precipitation of Mg_(24)Y_(5) *** corrosion rate of Mg–Y–Zn based alloys greatly increases from 7.4 mg·cm^(−2)·day^(−1) to 11.3 mg·cm^(−2)·day^(−1) with increasing the Y/Zn mole ratio up to *** should be attributed to the decreasing size of LPSO phase plates as cathodes,further increasing the hydrogen evolution *** related corrosion mechanism is discussed in details.

关键词： Mg–Y–Zn alloys Y/Zn mole ratio Corrosion resistance Electrochemical behaviors Microstructures

Cell membrane-derived biomimetic nanodecoys for viruses

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Science China(Life Sciences) 2020年第8期63卷 1254-1256页

作者： xuan liu Dengfeng Li Gang liu State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics&Center for Molecular Imaging and Translational Medicine School of Public HealthXiamen UniversityXiamen 361102China

Viruses cause numerous acute,chronic and life-threatening infectious diseases,and remain a major public health problem *** wide-spreading and highly pathogenic viruses,including hepatitis virus,human immune deficiency... 详细信息

关键词： al. decoy acute

Infectious Behavior in Photo-oxidation of Polymers

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Chinese Journal of Polymer Science 2020年第3期38卷 248-256,I0006页

作者： xuan liu Xiao-Peng Ren Rui Yang Department of Chemical Engineering Tsinghua University

When a polymer is used together with others,its aging process will be affected by the adjacent *** infectious behavior between polymers makes the aging process more complex than that of an individual *** this study,infectious behavior in photooxidation of polymers was ***(PPs),an unstabilized PP and a commercial PP,were chosen as the infection *** typical polymers,high density polyethylene(HDPE),low density polyethylene(LDPE),polystyrene(PS),polycarbonate(PC),poly(ethylene terephthalate)(PET),and polyamide 6(PA6),were used as the *** degree of oxidation of the targets was evaluated by attenuated total reflection-Fourier transform infrared spectroscopy(ATR-FTIR).An accelerating effect of two infection sources on the photo-oxidation of the target polymers was *** infectious agents from the infection sources were detected by pyrolysis-gas chromatography-mass spectrometry(Py-GC-MS)and gas chromatography(GC).The acceleration effect of two main infectious agents,*** and acetic acid,on the photo-oxidation of the commercial PP was *** infectious effect of the infection source on the target polymer was considered to be a comprehensive result of the effects of a variety of infectious agents.

关键词： Photo-oxidation Infection source Infectious agent Polypropylene

The influence of soil compaction in explaining spatial heterogeneity of different larch forest types: a preliminary study

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Journal of Forestry Research 2020年第6期31卷 2395-2401页

作者： Yuan Tian Qiuliang Zhang xuan liu Department of Forest Management College of ForestryInner Mongolia Agricultural UniversityHohhot 010019Inner Mongolia Autonomous RegionPeople’s Republic of China

Compacted soil has an adverse effect on plant roots and affects water and nutrient ***,different degrees of soil compaction may be suitable for growth and development of different understory *** study determined whether soil compaction could explain characteristics of 10 different Dahurian larch(Larix gmelinii Rupr.)forest types in the Daxing’anling *** relationship of soil compaction to soil depth was also ***-five tests were conducted on soil compaction of the 10 forest types with multiple comparisons,of which five showed no significant *** different soil depths,there were significant differences in soil compaction among forest *** correlation between the degree of soil compaction and depth was positive and *** Larix gmelinii—shrub forest type,***—herb forest type,and ***—swamp forest type were significantly different in soil compaction according to soil *** research indicates that,as a physical property,soil compaction may.

关键词： Vegetation distribution Biogeocenosis Species response Forest management Soil compaction

Hydrogen as a carrier of renewable energies toward carbon neutrality:State-of-the-art and challenging issues

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International Journal of Minerals,Metallurgy and Materials 2022年第5期29卷 1073-1089页

作者： xuan liu Gaoyang liu Jilai Xue Xindong Wang Qingfeng Li Department of Energy Conversion and Storage Technical University of DenmarkFysikvej 3102800 Kgs.LyngbyDenmark School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

Energy storage and conversion via a hydrogen chain is a recognized vision of future energy systems based on renewables and,therefore,a key to bridging the technological gap toward a net-zero CO_(2)emission *** paper reviews the hydrogen technological chain in the framework of renewables,including water electrolysis,hydrogen storage,and fuel cell *** electrolysis is an energy conversion technology that can be scalable in megawatts and operational in a dynamic mode to match the intermittent generation of renewable *** concerns include a robust diaphragm for alkaline cells,catalysts and construction materials for proton exchange membrane(PEM)cells,and validation of the long-term durability for solid oxide *** storage via compressed gas up to 70 MPa is optional for automobile *** cells favor hydrogen fuel because of its superfast electrode *** fuel cells and solid oxide fuel cells are dominating technologies for automobile and stationary applications,*** technologies are at the threshold of their commercial markets with verified technical readiness and environmental merits;however,they still face restraints such as unavailable hydrogen fueling infrastructure,long-term durability,and costs to compete with the analog power technologies already on the market.

关键词： carbon neutrality hydrogen energy water electrolysis hydrogen storage fuel cells

Resilient Power Systems Operation with Offshore Wind Farms and Cloud Data Centers

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CSEE Journal of Power and Energy Systems 2023年第6期9卷 1985-1998页

作者： Shengwei liu Yuanzheng Li xuan liu Tianyang Zhao Peng Wang Energy and Electricity Research Center Jinan UniversityZhuhai519070China Huazhong University of Science and Technology Wuhan430074China North China Electric Power University Beijing102206China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore

To enhance the resilience of power systems with offshore wind farms(OWFs),a proactive scheduling scheme is proposed to unlock the flexibility of cloud data centers(CDCs)responding to uncertain spatial and temporal impacts induced by *** total life simulation(TLS)is adopted to project the local weather conditions at transmission lines and OWFs,before,during,and after the *** static power curve of wind turbines(WTs)is used to capture the output of OWFs,and the fragility analysis of transmission-line components is used to formulate the time-varying failure rates of transmission lines.A novel distributionally robust ambiguity set is constructed with a discrete support set,where the impacts of hurricanes are depicted by these *** minimize load sheddings and dropping workloads,the spatial and temporal demand response capabilities of CDCs according to task migration and delay tolerance are incorporated into resilient *** flexibilities of CDC’s power consumption are integrated into a two-stage distributionally robust optimization problem with conditional value at risk(CVaR).Based on Lagrange duality,this problem is reformulated into its deterministic counterpart and solved by a novel decomposition method with hybrid cuts,admitting fewer iterations and a faster convergence *** effectiveness of the proposed resilient management strategy is verified through case studies conducted on the modified IEEERTS 24 system,which includes 4 data centers and 5 offshore wind farms.

关键词： Cloud computing data center decomposition hurricane offshore wind farm resilience enhancement total life simulation unit commitment