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Comparison of Thermal Performance between Annular Fins and Longitudinal Fins in Latent Heat Storage Unit

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Journal of Thermal Science 2023年第3期32卷 1227-1238页

作者： zhu Yuxi qiu Yan School of Energy and Power Engineering Shandong UniversityJi'nan 250061China

As a simple and effective method of heat transfer enhancement,fins are widely used in latent heat storage ***,the choice of annular fins and longitudinal fins has always been *** this paper,the melting process of phase change material(PCM)in annular fins and longitudinal fins latent heat storage units with the same volume is numerically *** ensure the same thermal penetration,three-dimensional spaces occupied with fins are specially controlled to be the *** with finned structures,the effects of natural convection(NC),placement mode and heat transfer fluid(HTF)inlet direction on the melting process are *** results show that the melting time in annular finned structure is always 10%less than that in longitudinal finned structure,which demonstrates the superior of the annular fins in the latent heat storage *** melting time is the shortest in vertical unit with annular fins and HTF inlet at the ***,the correlation formulas of the liquid fraction are proposed in the vertical unit with HTF inlet at the bottom.

关键词： latent heat storage annular fins longitudinal fins natural convection

Hybrid Aqueous/Organic Electrolytes Enable the High-Performance Zn-Ion Batteries

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Research 2019年第1期2019卷 56-65页

作者： jian-qiu Huang Xuyun Guo Xiuyi Lin Ye zhu Biao Zhang Department of Applied Physics The Hong Kong Polytechnic UniversityHung HomHong KongChina

Rechargeable aqueous zinc ion batteries(ZIBs)are considered as one of the most promising systems for large-scale energy storage due to their merits of low cost,environmental friendliness,and high *** utilization of aqueous electrolyte also brings about some problems such as low energy density,fast self-discharge,and capacity fading associated with the dissolution of metals in *** combat the issues,we utilize a freestanding vanadium oxide hydrate/carbon nanotube(V2O5·nH_(2)O/CNT)film as the cathode and probe the performance in aqueous/organic hybrid *** corresponding structural and morphological evolution of both V2O5·nH_(2)O/CNT cathode and Zn anode in different electrolytes is *** integrity of electrodes and the suppression of zinc dendrites during cycles are largely improved in the hybrid ***,the battery in hybrid electrolyte exhibits high capacities of 549 mAh g^(-1) at 0.5 A g^(-1) after 100 cycles and 282 mAh g^(-1) at 4 A g^(-1) after 1000 cycles,demonstrating an excellent energy density of 102 Wh kg^(-1) at a high power of 1500 W kg^(-1) based on the cathode.

关键词： battery electrolyte utilize

A copper-iodide cluster microcube-based X-ray scintillator

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Light(Science & Applications) 2023年第11期12卷 2261-2263页

作者： jian qiu Xiaogang Liu Joint School of the National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New City350207 FuzhouChina Department of Chemistry National University of SingaporeSingapore 117543Singapore Institute of Materials Research and Engineering Agency for ScienceTechnology and ResearchSingapore 138634Singapore

Newly developed copper-iodide cluster microcubes offer a solution to the issues commonly faced by powder scintillation *** problems include inadequate scintillation performance and significant light scattering,resulting in poor image *** the advent of monodisperse copper-iodide cluster microparticle scintillators,efficient and long-term stable scintillation is achieved,while ensuring ***,they enable highresolution static and dynamic X-ray imaging,providing high image quality.

关键词： cluster copper disperse

The role of magmatism in the thinning and breakup of the South China Sea continental margin

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National Science Review 2019年第5期6卷 871-876页

作者： Zhen Sun jian Lin Ning qiu Zhimin jian Pin Xian Wang Xiong Pang Jinyun Zheng Benduo zhu CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of Sciences Innovation Academy of South China Sea Ecology and Environmental Engineering Chinese Academy of Sciences Department of Geology and Geophysics Woods Hole Oceanographic Institution School of Ocean and Earth Science Tongji University East South China Sea Petroleum Research Institute Shenzhen branch of China National Offshore Oil Corporation Guangzhou Marine Geological Survey Ministry of Natural Resources

INTRODUCTION Magmatism plays a key role in the process of continental margin breakup and ocean *** in the extremely magma-poor Iberia and Newfoundland margin, studies of field outcrops have shown that syn-rift magmati... 详细信息

关键词： SCS The role of magmatism in the thinning and breakup of the South China Sea continental margin China

Novel rockburst prediction criterion with enhanced explainability employing CatBoost and nature-inspired metaheuristic technique

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Underground Space 2024年第6期19卷 101-118页

作者： Yingui qiu jian Zhou School of Resources and Safety Engineering Central South UniversityChangsha 410083China

Rockburst is a major challenge to hard rock engineering at great *** and timely assessment of rockburst risk can avoid unnecessary casualties and property *** the existence of various methods for rockburst assessment,there remains an urgent need for a comprehensive and reliable criterion that is easy to both apply and *** a new rockburst criterion based on simple parameters can potentially fill this *** its advantages,this criterion can facilitate a more effective and efficient prediction of rockburst potential,thereby contributing significantly to enhancing safety *** this paper,combined with the internal and external factors of rockburst,four control variables(i.e.,integrity index,stress index,brittleness index,and elastic energy index)were selected to be incorporated into a comprehensive rockburstability index(RBSI).Based on 116 sets of rockburst cases,the rockburst potential was accurately quantified and predicted using the categorical boosting(CatBoost)model and the nature-inspired metaheuristic African vultures optimization algorithm(AVOA).In its performance validation,the criterion achieved the highest accuracy of 90.48%,verifying the reliability and effectiveness of the proposed RBSI ***,an interpretive method was applied to analyze the variable influence on the criterion,facilitating the explanation of predictions and the analysis of the formula’s robustness under different *** general,compared with existing criterion methods involving relevant indicators,the newly proposed RBSI criterion enhances the accuracy of rockburst potential prediction,and it can effectively and swiftly evaluate the preliminary risk of ***,a graphical user interface was developed to provide a clear visualization of the assessment of rockburst potential.

关键词： Rockburst criterion CatBoost Metaheuristic optimization Model interpretation Graphical user interface

Molecular simulation study of the microstructures and properties of pyridinium ionic liquid[HPy][BF_(4)]mixed with acetonitrile

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原子与分子物理学报 2025年第4期42卷 27-32页

作者： XU jian-Qiang MA Zhao-Peng CHENG Si LIU Zhi-Cong zhu Guang-Lai Department of Physics School of Physics and Electronic InformationAnhui Normal UniversityWuhu 241002China

The microstructures and thermodynamic properties of mixed systems comprising pyridinium ionic liquid[HPy][BF_(4)]and acetonitrile at different mole fractions were studied using molecular dynamics simulation in this *** following properties were determined:density,self-diffusion coefficient,excess molar volume,and radial distribution *** results show that with an increase in the mole fraction of[HPy][BF_(4)],the self-diffusion coefficient ***,the excess molar volume initially decreases,reaches a minimum,and then *** rules of radial distribution functions(RDFs)of characteristic atoms are *** increasing the mole fraction of[HPy][BF_(4)],the first peak of the RDFs of HA1-F decreases,while that of CT6-CT6 rises at first and then *** indicates that the solvent molecules affect the polar and non-polar regions of[HPy][BF_(4)]differently.

关键词： Pyridinium ionic liquids Thermodynamic properties Molecular dynamics simulation Radial distribution functions

Visible light-driven organic photochemical synthesis in China

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Science China Chemistry 2019年第1期62卷 24-57页

作者： Yiyun Chen Liang-qiu Lu Da-Gang Yu Cheng-jian zhu Wen-Jing Xiao State Key Laboratory of Bioorganic and Natural Products Chemistry Shanghai Institute of Organic Chemistry University of Chinese Academy of Sciences Chinese Academy of Sciences Key Laboratory of Pesticide & Chemical Biology Ministry of Education College of Chemistry Central China Normal University Key Laboratory of Green Chemistry & Technology of Ministry of Education College of Chemistry Sichuan University State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University

In recent years, visible light-driven organic photochemical synthesis has attracted wide research interest from academic and industrial communities due to its features of green and sustainable chemistry. In this flourishing area, Chinese chemists have devoted great efforts to different aspects of synthetic chemistry. This review will summarize their representative work according to the following categories: C–H functionalization, synthesis of aromatic aza-heterocycles, asymmetric organic photochemical synthesis, transformations of small molecules and biomolecule-compatible reactions.

关键词： visible light photochemical synthesis C–H functionalization aromatic aza-heterocycle asymmetric catalysis biomolecule-compatible reaction small molecule

Equilibrium between titanium ions and high-purity titanium electrorefining in a NaCl-KCl melt

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International Journal of Minerals,Metallurgy and Materials 2014年第7期21卷 660-665页

作者： jian-xun Song qiu-yu Wang Guo-jing Hu Xiao-bo zhu Shu-qiang Jiao Hong-min zhu State Key Lab of Advanced Metallurgy University of Science and Technology Beijing

TiClx （x=2.17） was prepared by using titanium sponge to reduce the concentration of TiCl4 in a NaCl-KCl melt under negative pressure. The as-prepared NaCl-KCl-TiClx melt was employed as the electrolyte, and two parallel crude titanium plates and one high-purity titanium plate were used as the anode and cathode, respectively. A series of electrochemical tests were performed to investigate the influence of electrolytic parameters on the current efficiency and quality of cathodic products. The results indicated that the quality of cathodic products was related to the current efficiency, which is significantly dependent on the current density and the initial concentration of titanium ions. The significance of this study is the attainment of high-purity titanium with a low oxygen content of 30× 10^-6.

关键词： titanium electrodeposition ionic equilibrium high purity materials oxygen concentration

Ecological vulnerability assessment of the Ya'an-Qamdo section along the southern route of the Sichuan-Tibet transportation corridor

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Journal of Mountain Science 2022年第8期19卷 2202-2213页

作者： BAO Fang qiu jian School of Architecture Southwest Jiaotong UniversityChengdu 611756China China Railway Eryuan Engineering Group Co. Ltd.Chengdu 610031China

Identifying the ecological vulnerability of the sensitive and fragile ecosystem of the Ya’anQamdo section along the southern route of the Sichuan-Tibet transport corridor is of paramount importance to reduce environmental damage resulting from infrastructure *** paper divided the Ya’an-Qamdo transport section into 22subzones according to their ecological environment *** on the vulnerability evaluation model established by the fuzzy matter-element analysis method,the eight main assessment indicators of ecological vulnerability were windstorm,rainstorm,snowstorm,extreme temperature,extreme air pressure,geological hazard,natural conditions,and social *** rating and ranking of vulnerability in each subzone were based on the weight of the judgment *** processes were used to verify the rationality of both the indicators themselves and their *** results of this study show that subzone 9,located in the subalpine cold and humid forest and scrubland zone,is the most vulnerable,and subzone 1,located in the low-to mid-land warm and humid forest zone,is the least *** conclusion of the study suggests that targeted measures of ecological protection should be formulated before development and construction of major transportation *** should evade the most vulnerable areas,and in-depth research on ecological restoration should be carried out in low-to midvulnerability areas so that the ecological environment along the route can be protected effectively for sustainable economic and social development.

关键词： Ecosystem Vulnerability Subzone Sichuan-Tibet transportation corridor