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Zero increase in peak discharge for sustainable development

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Frontiers of Environmental Science & Engineering 2017年第4期11卷 11-21页

作者： Xing Fang Junqi Li Yongwei Gong Xiaoning li Department of Civil Engineering Auburn University Auburn AL 36849-5337 USA Key Laboratory of Urban Stormwater System and Water Environment Ministry of Education Beijing University of Civil Engineering and Architecture Beijing 100044 China

For urban land development, some or all natural land uses （primarily pervious） are converted into impervious areas which lead to increases of runoff volume and peak discharge. Most of the developed countries require a zero increase in peak discharge for any land development, and the policy has been implemented for several decades. The policy of zero increase in peak discharge can be considered as historical and early stage for the low impact development （liD） and sustainable development, which is to maintain natural hydrological conditions by storing a part or all of additional runoff due to the development on site. The paper will discuss the policy, the policy implementation for individual projects and their impact on regional hydrology. The design rainfalls for sizing liD facilities that are determined in 206 weather stations in USA are smaller than design rainfalls for sizing detention basins.The zero-increase policy links to financial responsibility and sustainability for construction of urban stormwater infrastructures and for reducing urban flooding. The policy was compared with current practices of urban development in China to shine the light for solving urban stormwater problems. The connections and differences among liD practices, the zero-increase policy, and the flood control infrastructure were discussed. We promote and advocate the zero-increase policy on peak discharge for comprehensive stormwater management in China in addition to liD.

关键词： Stormwater management Detention basin Zero increase Peak discharge ＇ Sustainable development Design rainfall

Numerical Study of Heat Transfer Characteristic for Subcooled Falling Film outside the Shaped Tubes under Rolling Motion

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Journal of Thermal Science 2023年第3期32卷 922-932页

作者： HAN Hui WANG junqi WANG Shaowei li Yuxing Provincial Key Laboratory of Oil and Gas Storage and Transportation Safety in Shandong Province China University of Petroleum(Huadong)Qingdao 266580China

The heat transfer performance of spiral wound heat exchanger used in the floating liquefied natural gas(FLNG)may be significantly affected by the sloshing conditions.In this paper,a three-dimensional numerical model combined with the dynamic mesh technology is conducted to study subcooled falling film heat transfer under static and sloshing conditions.The three-dimensional velocity distribution of the liquid film on the shell side is observed.The effects of cross-section shape of heat exchange tubes,Reynolds numbers and sloshing parameters on heat transfer characteristics are analyzed.The results indicate that the heat transfer performance of the egg-shaped tube is superior to that of the elliptical and circular tube under both static and sloshing conditions due to significant heat transfer improvement in the lower half of the tube.The heat transfer coefficients of three different kinds of tubes decrease under sloshing conditions.When the rolling amplitude is 6°,the average heat transfer coefficients of the circular tube,elliptical tube and egg-shaped tube are reduced by 2.1%,3.7%and 4.9%respectively.Under the current sloshing parameters,increasing the rolling amplitude,the heat transfer coefficients of three different tubes are slightly increased,while the sloshing period has little effect on heat transfer.The egg-shaped tube and elliptical tube are greatly affected by sloshing motion at the low Reynolds number,while the effect is relatively small at the high Reynolds number.

关键词： falling film flow sloshing condition spiral wound heat exchanger floating liquefied natural gas

Adaptive fault-tolerant control of high-speed maglev train suspension system with partial actuator failure: design and experiments

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第3期24卷 272-283页

作者： Yougang SUN Fengxing li Guobin liN junqi XU Zhenyu HE Institute of Rail Transit Tongji UniversityShanghai 201804China National Maglev Transportation Engineering R&D Center Tongji UniversityShanghai 201804China

High-speed maglev trains will play an important role in the high-speed transportation system in the near future.However,under the conditions of strong magnetic fields and continuous operation,the actuators of the high-speed maglev train suspension system are prone to lose partial effectiveness,which makes the suspension control problem challenging.In addition,most existing fault-tolerant control(FTC)methods for suspension systems require linearization around the equilibrium points during the controller design or stability analysis.Therefore,from a practical perspective,this study presents a novel nonlinear FTC strategy with adaptive compensation for high-speed maglev train suspension systems.First,a nonlinear dynamic model of the suspension system based on join-structure is established and the actuator failures are described.Then,a nonlinear fault-tolerant suspension control law with an adaptive update law is designed to achieve stable suspension against partial actuator failure.The Lyapunov theory and extended Barbalat lemma are utilized to rigorously prove the closed-loop asymptotic stability even if there is partial actuator failure,without any approximation to the original nonlinear dynamics.Finally,hardware experimental results are included to demonstrate the effectiveness of the proposed approach.

关键词： High-speed maglev transportation Suspension control system Adaptive fault-tolerant control(FTC) Partial actuator failure Mechatronics

Preclinical evaluation and pilot clinical study of [^(18)F]AlF-labeled FAPI-tracer for PET imaging of cancer associated fibroblasts

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Acta Pharmaceutica Sinica B 2022年第2期12卷 867-875页

作者： Kongzhen Hu Junqi Li lijuan Wang Yong Huang li li Shimin Ye Yanjiang Han Shun Huang Hubing Wu Jin Su Ganghua Tang Department of Nuclear Medicine Nanfang HospitalSouthern Medical UniversityGuangzhou 510515China Shenzhen International Institute for Biomedical Research Shenzhen 518116China National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital&Shenzhen Hospital Chinese Academy of Medical Sciences and Peking Union Medical CollegeShenzhen 518116China State Key Laboratory of Respiratory Disease National Clinical Research Center for Respiratory DiseaseGuangzhou Institute of Respiratory Healththe First Affiliated Hospital of Guangzhou Medical UniversityGuangzhou 510182China

In recent years,fibroblast activation protein(FAP)has emerged as an attractive target for the diagnosis and radiotherapy of cancers using FAP-specific radioligands.Herein,we aimed to design a novel^(18)Flabeled FAP tracer([^(18)F]Al F-P-FAPI)for FAP imaging and evaluated its potential for clinical application.The[^(18)F]Al F-P-FAPI novel tracer was prepared in an automated manner within 42 min with a non-decay corrected radiochemical yield of 32±6%(n=8).Among A549-FAP cells,[^(18)F]Al F-P-FAPI demonstrated specific uptake,rapid internalization,and low cellular efflux.Compared to the patent tracer[^(18)F]FAPI-42,[^(18)F]Al F-P-FAPI exhibited lower levels of cellular efflux in the A549-FAP cells and higher stability in vivo.Micro-PET imaging in the A549-FAP tumor model indicated higher specific tumor uptake of[^(18)F]Al F-P-FAPI(7.0±1.0%ID/g)compared to patent tracers[^(18)F]FAPI-42(3.2±0.6%ID/g)and[68 Ga]Ga-FAPI-04(2.7±0.5%ID/g).Furthermore,in an initial diagnostic application in a patient with nasopharyngeal cancer,[^(18)F]Al F-P-FAPI and[^(18)F]FDG PET/CT showed comparable results for both primary tumors and lymph node metastases.These results suggest that[^(18)F]Al F-P-FAPI can be conveniently prepared,with promising characteristics in the preclinical evaluation.The feasibility of FAP imaging was demonstrated using PET studies.

关键词： Fibroblast activation protein [^(18)F]AlF-P-FAPI PET Nasopharyngeal cancer

A Novel DDoS Attack Detection Method Using Optimized Generalized Multiple Kernel Learning

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Computers, Materials & Continua 2020年第3期62卷 1423-1443页

作者： Jieren Cheng Junqi Li Xiangyan Tang Victor SSheng Chen Zhang Mengyang li Key Laboratory of Internet Information Retrieval of Hainan Province Hainan UniversityHaikouChina College of Information Science&Technology Hainan UniversityHaikouChina Department of Computer Science University of Central ArkansasConwayAR 72035USA

Distributed Denial of Service(DDoS)attack has become one of the most destructive network attacks which can pose a mortal threat to Internet security.Existing detection methods cannot effectively detect early attacks.In this paper,we propose a detection method of DDoS attacks based on generalized multiple kernel learning(GMKL)combining with the constructed parameter R.The super-fusion feature value(SFV)and comprehensive degree of feature(CDF)are defined to describe the characteristic of attack flow and normal flow.A method for calculating R based on SFV and CDF is proposed to select the combination of kernel function and regularization paradigm.A DDoS attack detection classifier is generated by using the trained GMKL model with R parameter.The experimental results show that kernel function and regularization parameter selection method based on R parameter reduce the randomness of parameter selection and the error of model detection,and the proposed method can effectively detect DDoS attacks in complex environments with higher detection rate and lower error rate.

关键词： DDoS attack detection GMKL parameter optimization

Defective TiO_(2)-graphene heterostructures enabling in-situ electrocatalyst evolution for lithium-sulfur batteries

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Journal of Energy Chemistry 2021年第11期30卷 508-515,I0011页

作者： Yanqi Feng Hui liu Yi liu Fuwei Zhao Junqi Li Xuanmeng He School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi’an 710021ShaanxiPR China

lithium-sulfur (li-S) batteries are considered as one of the promising next-generation energy storage systems because of their high energy density. While the low utilization of sulfur and sluggish reaction kinetics would lead to degradation of electrochemical performance and thus hinder the practical application of li-S batteries. Herein, a double-shelled TiO_(2)-graphene heterostructure (H-TiO_(2)/rGO) with abundant oxygen vacancies (OVs) and highly exposed active plane as advanced host material in li-S batteries is designed. This rational structure not only provides sufficient active sites and lower bandgap for lithium polysulfides (liPSs), but also builds smooth adsorption-diffusion-conversion of liPSs on catalyst, which greatly reduces interfacial energy barrier and promotes the utilization of sulfur through suppressing the devastating shuttling effect. Combining the synergetic merits of strong anchoring ability and catalyzing the of liPSs, the electrode (S-TiO_(2)/rGO-1) exhibits superior rate performance and long lifespan (1000 cycles at 1C, 0.023% capacity loss per cycle) with high columbic efficiency. This work paves an alternative way to establish smooth adsorption-diffusion-conversion of polysulfides on catalyst in li-S batteries and provides a new sight to understand catalyst design in energy storage devices.

关键词： Oxygen vacancy TiO_(2) Heterostructure li-S batteries

Molten salt synthesis of Z-scheme CeO_(2)/C_(3)N_(4) photocatalysts with excellent properties for removal of organic pollutants:Characterization,kinetics and mechanisms

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Journal of Rare Earths 2023年第8期41卷 1153-1162,I0002页

作者： Deyang Ning Junqi Li Yuanpei Lan Hong Yong Sohn Jian Yang Chaoyi Chen Zhiyao Chu Xisong Mao Department of Metallurgical Engineering College of Materials and MetallurgyGuizhou UniversityGuiyang 550025China Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving Guiyang 550025China Department of Materials Science&Engineering University of UtahSalt Lake CityUT84112USA College of Materials Science and Engineering Chongqing UniversityChongqing 40044China

In this work,we firstly synthesized a CeO_(2)/C_(3)N_(4) photocatalyst with Z-scheme heterojunction by a facile liC-KCI molten salt method.The synthesized catalyst has an excellent quality for removing organic pollution of dyes and antibiotics in wastewater.As an example,the CeCN-1:5 prepared with a mass ratio of Ce_(2)(CO_(3))_(3)·xH_(2)O:C_(3)H_(3)N_(6)=1:5 exhibits a methylene blue(MB)removal capacity of 100%within 90 min and tetracycline(TC)removal capacity of 94.6%.After 4 cycles,the CeCN-1:5 keeps a removal efficiency of nearly 100%in 150 min for MB and 85.7%for TC.The kinetics study reveals that the MB removal process with the CeCN-1:5 fits the modified Elovich model with strong adsorption while TC removal fits the first-order model.The large surface area(238 m^(2)/g)and negative zeta potential(-39.3 mV)of CeCN-1:5 contribute to superior adsorption capacity to MB.However,the adsorption of TC is restricted due to the positive surface/pore potential in acidic ***-1:5has combined Z-scheme heterojunction and exhibits a low recombination rate of electrons(e^(-))/holes(h^(+))and the photo-generated active radicals of·OH/·O_(2)^(-)that promotes the photocatalytic performance.This novel CeO_(2)/C_(3)N_(4) photocatalyst with an excellent photocatalysis removal activity has an enormous potential for photocatalytic applications.

关键词： Molten salt synthesis CeO_(2)/C_(3)N_(4)composite Kinetic modeling Adsorption Photodegradation Rare earths

Spatiotemporal Characterization， Risk Assessment， and Source Identification of Dissolved Trace Elements in the Zijiang River， Central China

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Journal of Earth Science 2023年

作者： Junqi Li Yao Du Teng Ma Dian li Ziyan Cai Yu Xu Geological Survey China University of Geosciences Laboratory of Basin Hydrology and Wetland Eco-Restoration China University of Geosciences China Three Gorges Corporation School of Environmental Studies China University of Geosciences

The Zijiang River basin is home to the world’s largest antimony reserves， but it also grapples with severe ecological contamination. Notably， there is a lack of information on surface water pollution， particularly with regard to trace elements (TEs). In order to gain a better understanding of the situation， risk， and sources of TEs， we conducted an extensive study on the Zijiang River. Our findings revealed that 95.83% of the samples had antimony levels exceeding China’s drinking water limit of 5 μg/L. By using multiple multivariate statistical techniques， we identified five main sources of TEs. Sr， Mn， Co， Ni， and Ba are primarily derived from the natural weathering of rocks. Human activities， such as industrial emissions， are major contributors to the presence of Pb， Cu， Zn， and Sn. P and Ti are released from sediment influenced by cascading reservoirs. Sb， As， and Se stem from antimony mining activities. The hazard index indicated that antimony poses a non-carcinogenic risk to human health， with children being especially vulnerable. Furthermore， antimony was found to be the most significant factor for residential exposure. Consequently， we recommend paying close attention to antimony pollution and intensifying research efforts on antimony in the Zijiang River basin.

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Effects of Crystallinity and Defects of Layered Carbon Materials on Potassium Storage:A Review and Prediction

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Electrochemical Energy Reviews 2022年第2期5卷 401-433页

作者： Xiaoxu liu Tianyi Ji Hai Guo Hui Wang Junqi Li Hui liu Zexiang Shen Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials School of Material Science and EngineeringShaanxi University of Science and TechnologyXi’an 710021ShaanxiChina Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore College of Computer Science and Technology Dalian Minzu UniversityDalian 116650LiaoningChina

Layered carbon materials(LCMs)are composed of basic carbon layer units,such as graphite,soft carbon,hard carbon,and graphene.While they have been widely applied in the anode of potassium-ion batteries,the potassium storage mechanisms and performances of various LCMs are isolated and difficult to relate to each other.More importantly,there is a lack of a systematic understanding of the correlation between the basic microstructural unit(crystallinity and defects)and the potas-sium storage behavior.In this review,we explored the key structural factors affecting the potassium storage in LCMs,namely,the crystallinity and defects of carbon layers,and the key parameters(L_(a),L_(c),d_(002),I_(D)/I_(G))that characterize the crystallinity and defects of different carbon materials were extracted from various databases and literature sources.A structure–property database of LCMs was thus built,and the effects of these key structural parameters on the potassium storage properties,including the capacity,the rate and the working voltage plateau,were systematically analyzed.Based on the structure–prop-erty database analysis and the guidance of thermodynamics and kinetics,a relationship between various LCMs and potas-sium storage properties was established.Finally,with the help of machine learning,the key structural parameters of layered carbon anodes were used for the first time to predict the potassium storage performance so that the large amount of research data in the database could more effectively guide the scientific research and engineering application of LCMs in the future.

关键词： Layered carbon materials Crystallinity and defects Potassium storage properties Machine learning