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Improvement of the Subcooling Problem of Sodium Acetate Trihydrate by a Combination of Stirring or Internal Electric Field and Nucleating Agent

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Journal of Thermal Science 2024年第6期33卷 2235-2244页

作者： WANG Chuang WANG Suyaola liu pengcheng CHENG Xingxing WANG Zhiqiang School of Energy and Power Engineering Shandong UniversityJi'nan 250061China National Engineering Laboratory for Reducing Emissions from Coal Combustion Ji'nan 250061China

Energy storage devices are the hub of a multi-energy complementary distributed energy *** salts are the most suitable phase change material for energy storage devices,but subcooling is the main obstacle to their *** requires a driving force so the use of nucleating agents alone does not reduce subcooling to a very low *** address this issue,this paper first screened nucleating agents and then further reduced the subcooling of sodium acetate trihydrate in conjunction with stirring or direct *** effects of rotor mass,rotational speed,direct current voltage,and electrode material on nucleation were ***,the stability of the composite phase change material in the presence of simultaneous stirring and energization was *** results showed that the addition of 1.5%in weight of disodium hydrogen phosphate dodecahydrate to sodium acetate trihydrate can reduce the subcooling to about 2.3℃.Continued addition of stirring or electricity can reduce the subcooling of sodium acetate trihydrate to within 0.5℃ or even eliminate *** higher the momentum of the stirring,the better the improvement in subcooling,phase separation,and thermal *** higher the direct current voltage,the better the nucleation effect,but the electrode life will be *** silver electrode has the best nucleation *** new material was produced in the solution after 100 cycles in the presence of both stirring and direct *** melting point of the phase change material was increased by 0.2℃ and the latent heat value decreased by 1.8%,still with good *** trace of deionized water should be added to the phase change material in subsequent studies to compensate for the consumption ofwaterby theanodicelution.

关键词： phase change material sodium acetate trihydrate subcooling stirring internal electric field

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Facile Synthesis of Mesoporous Co3O4 Nanoflowers for Catalytic Combustion of Ventilation Air Methane

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Chemical Research in Chinese Universities 2017年第6期33卷 965-970页

作者： liu Shankui liu pengcheng NIU Ruyue WANG Shuang LI Jinping Research Institute of Special Chemicals Taiyuan University of Technology Taiyuan 030024 P. R. China College of Environmental Science and Engineering Taiyuan University of Technology Jinzhong 030600 P. R. China

Flower-like Co3O4 hierarchical microspheres composed of self-assembled porous nanoplates were pre- pared by employing Pluronic F127 block-copolymer as template. The samples were characterized by powder X-ray diffraction（PXRD）, scanning/transmission electron microscopy（SEM/TEM）, and nitrogen adsorption-desorption at 77 K. The results show that the catalytic activity of Co3O4 nanoflowers for the combustion of ventilation air methane is higher than that of commercial Co3O4. The superior catalytic performance of this material can be related to its dominantly exposed {112} crystal planes and higher content of surface Co3＋.

关键词： Co3O4 Nanoflower Catalytic combustion Ventilation air methane

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Nyquist Stability Analysis and Capacitance Selection for DC Current Flow Controllers in Meshed Multi-terminal HVDC Grids

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CSEE Journal of Power and Energy Systems 2021年第1期7卷 114-127页

作者： Puyu Wang Shihua Feng pengcheng liu Ningqiang Jiang Xiao-Ping Zhang School of Automation Nanjing University of Science&Technology(NUST)Nanjing 210094China School of Engineering University of BirminghamEdgbastonBirmingham B152TTUnited Kingdom

Controllability of DC current/power flow is essentialin multi-terminal HVDC (MTDC) grids, particularly for theMTDC grids in a meshed topology. In this paper, consideringmeshed MTDC (M2TDC) grids with the installation of twoline/multi-lineDC current flow controllers (CFCs), a small-signalmodel of the DC CFCs integrated M2TDC grids is derived,studying the impact of the power losses of the DC CFC andtheir influence on the analysis of energy exchanges. The systemstability analysis is analysed using the Nyquist diagram, which ismore suitable for analyzing complex nonlinear systems with morecompact and reliable indicators of stability in comparison withgain/phase margins shown in the Bode diagram. In addition, aselection method of the interconnected capacitor of the DC CFCis proposed under different operating conditions. The impact ofthe switching frequencies of the DC CFC on the control ranges ofthe DC current flows is analyzed. The effectiveness of the Nyquistanalysis and the capacitance selection method is verified bysimulation studies using PSCAD/EMTDC. The obtained control ranges of the DC CFC with different switching frequenciesand capacitances would be useful for practical engineeringapplications.

关键词： Capacitance selection method control ranges DC current flow controller(CFC) meshed multi-terminal HVDC(M2TDC)grid Nyquist stability analysis small-signal modelling switching frequencies

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Efficient seismic analysis for nonlinear soil-structure interaction with a thick soil layer

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Earthquake Engineering and Engineering Vibration 2021年第3期20卷 553-565页

作者： Gao Zhidong Zhao Xu Zhao Mi Du Xiuli Wang Junjie liu pengcheng Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of TechnologyBeijing 100124China College of Civil Engineering Tongji UniversityShanghai 200092China

The direct finite element method is a type commonly used for nonlinear seismic soil-structure interaction(SSI)*** method introduces a truncated boundary referred to as an artificial boundary meant to divide the soil-structure system into finite and infinite *** artificial boundary condition is used on a truncated boundary to achieve seismic input and simulate the wave radiation effect of infinite *** the soil layer is particularly thick,especially for a three-dimensional problem,the computational efficiency of seismic SSI analysis is very low due to the large size of the finite element model,which contains an whole thick soil *** this paper,an accurate and efficient scheme is developed to solve the nonlinear seismic SSI problem regarding thick soil *** process consists of nonlinear site response and SSI *** nonlinear site response analysis is still performed for the whole thick soil *** artificial boundary at the bottom of the SSI analysis model is subsequently relocated upward from the bottom of the soil layer(bedrock surface)to the location nearest to the structure as ***,three types of typical sites and underground structures are adopted with seismic SSI analysis to evaluate the accuracy and efficiency of the proposed efficient analysis scheme.

关键词： soil-structure interaction thick soil layer efficient analysis absorbing boundary

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Revealing the role of electrode potential micro-environments in single Mn atoms for carbon dioxide and oxygen electrolysis

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Nano Research 2024年第9期17卷 7957-7966页

作者： pengcheng liu anyi liu Kaili Wang Shuai Shi Mengmeng Jin Jingxiu liu Tao Qin Qian liu Xijun liu Jia He Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry and Chemical EngineeringInstitute of New-Energy Materials and Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China School of Chemistry and Chemical Engineering and Environmental Engineering Weifang UniversityWeifang 261061China Department of Electrical Engineering and Automation Luoyang Institute of Science and TechnologyLuoyang 471023China Institute for Advanced Study Chengdu UniversityChengdu 610106China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China

Elucidation the relationship between electrode potentials and heterogeneous electrocatalytic reactions has attracted widespread *** we construct the well-defined Mn single-atom(MnSA)catalyst with four N-coordination through a simple thermal pyrolysis preparation method to investigate the electrode potential micro-environments effect on carbon dioxide reduction reactions(CO_(2)RR)and oxygen reduction reactions(ORR).MnSA catalysts generate higher CO production Faradaic efficiency of exceeding 90%at-0.9 V for CO_(2)RR and higher H_(2)O_(2)yield from 0.1 to 0.6 V with excellent ORR *** functional theory(DFT)calculations based on constant potential models were performed to study the mechanism of MnSA on CO_(2)*** thermodynamic energy barrier of CO_(2)RR is lowest at-0.9 V *** hydrogen electrode(RHE).Similar DFT calculations on the H_(2)O_(2)yield of ORR showed that the H_(2)O_(2)yield at 0.2 V was *** study provides a reasonable explanation for the role of electrode potential micro-environments.

关键词： electrode potential micro-environments Mn single-atom catalyst carbon dioxide reduction reaction oxygen reduction reaction constant potential models

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脊柱内镜杂交技术与单轴脊柱内镜治疗双侧症状腰椎管狭窄症的减压效果对比

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中国组织工程研究 2025年第3期29卷 517-523页

作者：郭松李新华晏美俊刘彦斌刘中李克威刘鹏程张备挺付强上海交通大学附属第一人民医院脊柱外科上海市200080

背景:单轴脊柱内镜下腰椎管减压是一种新型的治疗腰椎管狭窄症的微创手术方式,但是该技术学习曲线陡峭,对手术设备和器械要求较高,限制其临床应用。前期作者团队将脊柱内镜作为监视内镜结合单侧双通道内镜技术率先提出脊柱内镜杂交技术... 详细信息

背景:单轴脊柱内镜下腰椎管减压是一种新型的治疗腰椎管狭窄症的微创手术方式,但是该技术学习曲线陡峭,对手术设备和器械要求较高,限制其临床应用。前期作者团队将脊柱内镜作为监视内镜结合单侧双通道内镜技术率先提出脊柱内镜杂交技术,实现同轴内镜下操作与双手分离操作。目的:比较脊柱内镜杂交技术及单轴脊柱内镜技术治疗双侧症状腰椎管狭窄症的临床疗效。方法:回顾性分析2020年8月至2022年8月在上海交通大学附属第一人民医院接受治疗的双侧下肢疼痛症状腰椎管狭窄症患者90例,其中A组(脊柱内镜杂交技术)44例,B组(单轴脊柱内镜术)46例。术中观察神经减压情况;记录两组患者手术时间、住院时间及花费;记录并对比术前及术后3 d、3个月、6个月腰痛及双侧下肢放射痛目测类比评分、生活质量Oswestry功能障碍指数及改良Macnab优良率。结果与结论:①A组手术时间明显短于B组(P0.05);A组术后3,6个月症状轻微侧目测类比评分明显低于B组(P0.05);术后3,6个月Oswestry功能障碍指数组间比较,A组明显低于B组(P<0.05);④术后3个月A组Macnab优良率明显高于B组(95%,78%,P<0.05);⑤提示脊柱内镜杂交技术是一种新型的脊柱内镜技术,具有微创手术创伤小、恢复快等优势,采用该技术行单侧入路双侧减压治疗双侧症状腰椎管狭窄症的疗效优于单轴脊柱内镜技术,同时具有开放手术器械操作灵活性好、减压效率高的优势。

关键词：脊柱内镜杂交技术单轴脊柱内镜技术腰椎管狭窄症双侧症状减压

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Identification of a senescence-related protease in coriander leaves

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Chinese Science Bulletin 2002年第13期47卷 1096-1099页

作者： Weibo Jiang Xiangjuan Zhou Yumei Zhao pengcheng liu China Agr Univ Sch Food Sci Beijing 100094 Peoples R China

Senescence-related protease may play an important role in leaf senescence. By improved SDS-Gela-tin-PAGE assay, a 63 ku senescence-related protease (63 SRP) in coriander leaves was identified. Activity of 63 SRP was increased in parallel to the advance of coriander leaf senescence, and inhibited by treating the leaf with gibberellic acid, and enhanced by ethylene treatment. The 63 SRP was suggested to be a serine protease based on the fact that its activity was inhibited by the protease inhibitor PMSF. The optimal temperature for the activity of the 70 ku protease was 50°C. The maximal activity was observed at pH 6-9, some activity could be observed on the gel slices incubated at pH 5 or 11. The 63 SRP was partly purified by the way of ammonium sulfate precipitation and then gel slicing after gel elec-trophoresis.

关键词： coriander leaf senescence protease protein degradation.

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The eff ects of temperature and host size on the development of Brachymeria lasus parasitising Hyphantria cunea

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Journal of Forestry Research 2021年第1期32卷 401-407页

作者： Shuo Tian Tianzi Gu Cong Chen Xudong Zhao pengcheng liu Dejun Hao Co-Innovation Center for the Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing 210037People’s Republic of China College of Forestry Nanjing Forestry UniversityNanjing 210037People’s Republic of China

Brachymeria lasus Walker is a solitary endoparasitoid that attacks the pupae of a wide range of lepidopteran hosts,including an important invasive species,the fall webworm(Hyphantria cunea Drury).We studied the relationship between temperature and development of *** from egg to adult *** results show a decrease in parasitoid development time from 34.4 days at 18°C to 10.6 days at 32°*** minimum threshold temperature of *** was 13.2°C±1.7°C,and the eff ective accumulated temperature was 210.3±28.7 degree *** results provide a basis for optimizing the production of this *** addition,the eff ects of host size on off spring performance of *** were investigated under laboratory *** spring longevity,size,and percentage of females were positively correlated with host *** off spring are larger and live longer than ***,this research showed that parasitoid adults successfully emerged from approximately 27.9%of ***,eclosion or hatching of *** decreased dramatically,which may be due to damage caused by female *** when testing hosts with their ovipositors or by feeding on *** results suggest that *** has the potential to become an effi cient natural enemy for controlling ***.

关键词： Hyphantria cunea Brachymeria lasus Parasitoid Temperature Development Fitness

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In situ atomic-scale tracking of unusual interface reaction circulation and phase reversibility in(de)potassiated alloy-typed anode

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Journal of Energy Chemistry 2024年第8期95卷 241-249,I0006页

作者： Lin Su Ruining Fu Shuangying Lei Yuchen Pan Chongyang Zhu pengcheng liu Feng Xu SEU-FEI Nano-Pico Center Key Laboratory of MEMS of the Ministry of EducationSoutheast UniversityNanjing210096China

Alloy-typed anode materials,endowed innately with high theoretical specific capacity,hold great promise as an alternative to intercalation-typed counterparts for alkali-ion *** tremendous efforts devoted to addressing drastic volume change and severe pulverization issues of such anodes,the underlying mechanisms involving dynamic phase evolutions and reaction kinetics have not yet been fully ***,taking antimony(Sb)anode as a representative paradigm,its microscopic operating mechanisms down to the atomic scale during live(de)potassiation cycling are systematically unraveled using in situ transmission electron *** reversible phase transformations at single-particle level,that are Sb←→KSb_(2)←→KSb←→K_5Sb_(4)←→K_(3)Sb,were revealed during ***,multiple phase interfaces associated with different reaction kinetics coexisted and this phenomenon was properly elucidated in the context of density functional theory ***,previously unexplored unidirectional circulation of reaction interfaces within individual Sb particle is confirmed for both potassiation and *** on the empirical results,the surface diffusion-mediated potassiation-depotassiation pathways at single-particle level are *** work affords new insights into energy storage mechanisms of Sb anode and valuable guidance for targeted optimization of alloy-typed anodes(not limited to Sb)toward advanced potassium-ion batteries.

关键词： Alloy-typed anode Potassium storage mechanism In situ transmission electron microscopy Reaction interface

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Rate transient analysis methods for water-producing gas wells in tight reservoirs with mobile water

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Energy Geoscience 2024年第1期5卷 311-320页

作者： Qingyan Yu Ying Jia pengcheng liu Xiangyang Hu Shengye Hao Research Institute of Petroleum Exploration and Development of SINOPEC Beijing100083China School of Energy Resources China University of GeosciencesBeijing100083China

Tight gas reservoirs with mobile water exhibit multi-phase flow and high stress *** analyzing the reservoir and well parameters using conventional single-phase rate transient analysis methods proves *** study introduces novel rate transient analysis methods incorporating evaluation processes based on the conventional flowing material balance method and the Blasingame type-curve method to examine fractured gas wells producing *** positing a gas-water two-phase equivalent homogenous phase that considers characteristics of mobile water,gas,and high stress sensitivity,the conventional single-phase rate transient analysis methods can be applied by integrating the phase's characteristics and defining the phase's normalized parameters and material balance *** rate transient analysis methods based on the equivalent homogenous phase can be used to quantitatively assess the parameters of wells and gas reservoirs,such as original gas-in-place,fracture half-length,reservoir permeability,and well drainage *** facilitates the analysis of production dynamics of fractured wells and well-controlled areas,subsequently aiding in locating residual gas and guiding the configuration of well *** specific evaluation processes are ***,a numerical simulation mechanism model was constructed to verify the reliability of the developed *** methods introduced have been successfully implemented in field water-producing gas wells within tight gas reservoirs containing mobile water.

关键词： Gas reservoirs with mobile water Gas-water two phase flow High stress sensitivity Equivalent homogenous phase Rate transient analysis

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