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Prediction of three-dimensional elastic behavior of filament-wound composites based on the bridging model

Defence technology（防务技术） 2021年第2期17卷 609-616页

作者： Dong-mei Yin Bao-ming Li Hong-cheng Xiao National Key Laboratory of Transient Physics Nanjing University of Science&TechnologyNanjing210094China

This work provides a method to predict the three-dimensional equivalent elastic properties of the filament-wound composites based on the multi-scale homogenization *** the meso-scale,a representative volume element(RVE)is defined and the bridging model is adopted to establish a theoretical predictive model for its three-dimensional equivalent elastic *** results obtained through this method for the previous experimental model are compared with the ones gained respectively by experiments and classical laminate theory to verify the reliability of this *** addition,the effects of some winding parameters,such as winding angle,on the equivalent elastic behavior of the filament-wound composites are *** rules gained can provide a theoretical reference for the optimum design of filament-wound composites.

关键词： Lightweight design Filament-wound composites Bridging model Three-dimensional elastic properties

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Effect of Operation Parameters on the Thermal Characteristics in a Planar Solid Oxide Fuel Cell

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Journal of Thermal science 2024年第5期33卷 1974-1989页

作者： WANG Mingyuan WANG Ke WANG Yongqing CHEN Jiangshuai AN Bo TU Shantung School of Mechanics and Safety Engineering Zhengzhou UniversityZhengzhou 450001China Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province Zhengzhou UniversityZhengzhou 450002China School of Mechanical and Power Engineering Zhengzhou UniversityZhengzhou 450001China Key Laboratory of Pressure Systems and Safety(MOE) East China University of Science&TechnologyShanghai 200237China

Effective operation strategies in the solid oxide fuel cell(SOFC)can adjust the spatial distribution of temperature gradient favoring the long-term *** investigate the effects of different operating conditions on the thermal behavior inside SOFC,a three-dimensional model is developed in this *** model is verified by comparing it with the experimental *** heat generation rate and its variation under different operating conditions are *** combined effects of operating voltage and gas temperature are considered to be the key factor influencing the temperature *** to the original case,the temperature of SOFC decreases by 21.4 K when the fuel velocity reaches 5 m/*** the maximum temperature gradient increases by21.2%.Meanwhile,higher fuel velocities can eliminate about 32%of the area with higher temperature *** when the oxidant velocity reaches 7.5 m/s,the peak temperature gradient effectively decreases by 16.59%.Simultaneous adjustment of the oxidant and fuel velocities can effectively reduce the peak temperature gradient and increase the safety *** effects of operation conditions on the temperature gradient of the cell are clarified in this study,which can be a reference for further research on the reliability of SOFCs.

关键词： SOFC heat generation temperature gradient distribution heat source thermal behavior

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Role of Intraseasonal Oscillation in a Compound Drought and Heat Event over the Middle of the Yangtze River Basin during Midsummer 2018

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Journal of Meteorological Research 2022年第4期36卷 643-657页

作者： Chuhan LU Yichen SHEN Yonghua LI Bo XIANG Yujing QIN Key Laboratory of Meteorological Disaster Ministry of EducationNanjing University of Information Science&TechnologyNanjing 210044 Chongqing Climate Center Chongqing 401147

In late July 2018, a compound drought and heat event(CDHE) occurred in the middle of the Yangtze River basin(MYRB) and caused great damage to the national economy. The CDHE over the MYRB has been documented to be linked with intraseasonal oscillations(ISOs) from different regions. However, specific roles of different ISOs on the development of the CDHE cannot be separated in the observational analysis. By using partial lateral forcing experiments driven by ISO in the Weather Research and Forecasting(WRF) model, we found that the midlatitude ISO generated by a westerly wave train in the upper troposphere played an important role in this heatwave and drought event in the northern MYRB, causing a regional average temperature rise of 1.65°C and intensification of drought over23.49% of the MYRB area. On the other hand, the ISO associated with the Pacific-Japan(PJ)-like teleconnection wave train in the lower troposphere induced a more pronounced impact on the event, causing an average temperature rise of 2.44°C, intensifying drought over 29.62% of the MYRB area. The MYRB was mainly affected by northward warm advection driven by the westward extension of the western North Pacific subtropical high in the early period of the CDHE development. In the late period, because of the establishment of a deep positive geopotential height field through the troposphere leading to intensive local subsidence, there was a remarkable temperature rise and moisture decrease in the MYRB. The results will facilitate a better understanding of the occurrence of CDHE and provide empirical precursory signals for subseasonal forecast of CDHE.

关键词： partial lateral forcing experiment compound drought and heat event meteorological drought composite index(MCI) middle of the Yangtze River basin(MYRB)

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Evaluation of CLDAS and GPM Precipitation Products over the Tibetan Plateau in Summer 2005–2021 Based on Hourly Rain Gauge Observations

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Journal of Meteorological Research 2024年第4期38卷 749-767页

作者： Qiaohua LIU Xiuping YAO School of Atmospheric Sciences Nanjing University of Information Science&TechnologyNanjing 210044 State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijing 100081 China Meteorological Administration Training Centre Beijing 100081

Accurate,reliable,and high spatiotemporal resolution precipitation products are essential for precipitation research,hydrological simulation,disaster warning,and many other applications over the Tibetan Plateau(TP).The Global Precipitation Measurement(GPM) data are widely recognized as the most reliable satellite precipitation product for the *** China Meteorological Administration(CMA) Land Data Assimilation System(CLDAS) precipitation fusion dataset(CLDAS-Prcp),hereafter referred to as CLDAS,is a high-resolution,self-developed precipitation product in China with regional *** on the TP,this study provides a long-term evaluation of CLDAS and GPM from various aspects,including characteristics on different timescales,diurnal variation,and elevation impacts,based on hourly rain gauge data in summer from 2005 to *** results show that CLDAS and GPM are highly effective alternatives to the rain gauge records over the *** both perform well for precipitation amount and frequency on multiple *** tends to overestimate precipitation amount and underestimate precipitation frequency over the ***,GPM tends to overestimate both precipitation amount and *** difference between them mainly lies in the trace *** and GPM effectively capture rainfall events,but their performance decreases significantly as intensity *** both show better accuracy in diurnal variation of precipitation amount than frequency,and their performance tends to be superior during nighttime compared to the ***,there are some differences of the two against rain gauge observations in diurnal variation,especially in the phase of the diurnal *** performance of CLDAS and GPM varies at different *** both have the best performance over 3000–3500 *** elevation dependence of CLDAS is relatively minor,while GPM shows a stronger elevation dependence in terms of precipitation *** tends to ov

关键词： China Meteorological Administration(CMA)Land Data Assimilation System(CLDAS)precipitation fusion dataset(CLDAS-Prcp) Global Precipitation Measurement(GPM) Tibetan Plateau(TP) precipitation evaluation

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Environment-friendly Ca^(2+)/Cr^(3+)co-doping LaAlO_(3) ceramics with excellent infrared radiation performance for energy-saving

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Journal of Advanced Ceramics 2025年第1期14卷 205-214页

作者： Xinglai Yuan Qinghu Wang Runke Wu Shaobai Sang Yibiao Xu Xiong Liang Liping Pan Bingbing Fan Yawei Li Rui Zhang Jiangtao Li Olena Volkova The State Key Laboratory of Refractories and Metallurgy Joint International Research Laboratory of Refractories and MetallurgyWuhan University of Science&TechnologyWuhan 430081China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Institute of Advanced Ceramics Henan Academy of SciencesZhengzhou 450046China Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China Institute of Iron and Steel Technology TU Bergakademie FreibergFreiberg 09599Germany

Ca^(2+)/Cr^(3+)co-doped LaAlO_(3) infrared(IR)ceramics have been proven to be potential energy-saving materials for high-temperature industries because of their high emissivity and high-temperature ***,Cr^(6+)formation commonly occurs in materials and poses environmental and health risks,such as Cr^(6+)dissolution in water and CrO_(3)(g)*** this study,we combined high emissivity with in situ detoxification by introducing residual Al_(2)O_(3) into Ca^(2+)/Cr^(3+)co-doped LaAlO_(3) *** with the undoped ceramics,the addition of 20 wt%residual Al_(2)O_(3) resulted in a 78.5%reduction to 18.44 mg/kg(lower than the EU standard of 20 mg/kg)in Cr^(6+)dissolution and a decrease in 77.8%CrO_(3)(g)*** significant detoxification effect can be attributed to the formation of CaAl_(12−x)Cr_(x)O_(19).Additionally,as the residual Al_(2)O_(3) content increased from 5 to 20 wt%,the ceramics maintained high emissivity,above 0.896 in the near-infrared band and 0.781 in the mid-infrared ***,the IR coating effectively increased the surface temperature(from 767.1 to 790.7℃/min)and the heat radiation of the heating source,increasing the heating rate from 31.7 to 34.6℃/min during water *** work offers a promising approach for designing environmentally friendly IR ceramics with excellent IR performance for energy-saving applications in the high-temperature industry.

关键词： infrared(IR)radiation energy-saving environmentally friendly Cr^(6+)suppression LaAlO_(3)

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Pd-catalyzed diastereoselective 1,1-diarylation of 1,1-disubstituted alkenes enabling the modular synthesis of 1,1,2,2-tetraarylethanes

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science China Chemistry 2023年第12期66卷 3539-3545页

作者： Chengxi Zhang Yang Xi Jingping Qu Yifeng Chen Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research CenterFrontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science&TechnologyShanghai 200237China

The highly diastereoselective dicarbofunctionalization of substituted olefins still remains a daunting challenge in synthetic ***,we report a Pd-catalyzed diastereoselective 1,1-diarylation of 1,1-diarylethylene with chelation group free to enable the modular synthesis of smart material candidates,1,1,2,2-tetraarylethanes(TAEs),which represent the first protocol by assembling four different aryl groups into ethane *** mechanistic experiments suggest that the crucial Pd–H species generated in situ do not disengage from the alkene intermediate during the reaction.

关键词： 1,1,2,2-tetraarylethane palladium cross-coupling reaction alkene multicomponent reactions

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Effect of Phase Separation Size on the Properties of Self-healing Elastomer

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Chinese Journal of Polymer science 2024年第6期42卷 798-804页

作者： Jun Xu Lei Zhu Xian-Qi Feng Cong Sui Wen-Peng Zhao Shou-Ke Yan School of Chemical Engineering Qingdao University of Science&TechnologyQingdao266042China College of Engineering Yanching institute of TechnologyLangfang065210China Key Laboratory of Rubber-plastics Qingdao University of Science&TechnologyQingdao266042China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China

Regulation of phase structure has been recognized as one of the most effective ways to fabricate self-healing polymers with high mechanical *** mechanical properties of the resultant polymers are certainly affected by the size of separated phase ***,the study on this aspect is absence,because it can hardly exclude the influence of variation in monomer proportion required for tuning the separated phase ***,we report the first study on tuning the phase size through reversible addition-fragmentation chain transfer(RAFT)polymerization without changing the proportion of *** expected,the size of separated phase has been successfully mediated from 15 nm to 9 nm by tuning the molecular weight of the chain transfer *** is found that the mechanical strength and the self-healing efficiency of the resultant polymers increase simultaneously with the decrease of phase *** study on the formation kinetics of hydrogen bonds reveals that the decrease of phase size can facilitate the re-bonding rate of hydrogen bonds,even if the migration of polymer chains is restricted.

关键词： Self-healing polymers Phase separation Reversible addition-fragmentation chain transfer

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New digital drilling process monitoring: Instrumentation, validation and calibration

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Journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 31-54页

作者： Yanpeng Sun Zuyu Chen Fangcai Xu Yufei Zhao Ruilang Cao Dong Li State Key Laboratory of Eco-hydraulics in Northwest Arid Region Xi'an University of TechnologyXi'an710048China State Key Laboratory of Simulation and Regulation of the Water Cycle in River Basins China Institute of Water Resources and Hydropower ResearchBeijing100048China Sinohydro Foundation Engineering Co. Ltd.Tianjin301700China North China Institute of Science&Technology Langfang065201China

This study aims to enhance the digital drilling process monitoring(DPM)or monitoring while drilling(MWD)technique,which is a widely recognized method in geological exploration for evaluating rock mass ***,robust displacement and torque measurement facilities for rotary-core drilling are *** conventional cable encoder for displacement measurement is replaced with a magnetostrictive displacement sensor,which is more reliable in harsh field drilling *** enables the measurement of the bit position with an accuracy of<1 *** importantly,this new instrument is proven to be successful in improving the detection of structural discontinuities with thicknesses>1 *** addition,by measuring the electric current of the driving motor,the torque applied to the bit is conveniently and accurately *** innovations ensure high-quality data collection for DPM ***,two indices derived from DPM are proposed to quantitatively describe rock mass *** specific energy index(SEI)and specific penetration index(SPI)are based on the principles of energy conservation and Mohr-Coulomb failure criterion,*** field tests conducted in a dam grouting area confirm a linear relationship between the thrust force and penetration per rotation,and between the torque and penetration per *** correlation ratios of the related regressions are typically>*** two indices allow for the quantitative interpretation of DPM data into rock mechanics characteristics,such as uniaxial compressive strength,rock quality designation(RQD),and rock mass permeability,eliminating the need for subjective judgment normally involved in the currently used rock mass quality rating approaches.

关键词： Drilling process monitoring Specific penetration index Specific energy index Fracture identification

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Interfaces engineering of heterostructured Ni Co P/Ni Fe LDH@CC for attaining high catalytic activity in long-lasting rechargeable Zn-air batteries

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Rare Metals 2024年第10期43卷 4961-4972页

作者： Xiao-Lin Hu Ji-Chuan Fan Xiang Li Zhen-Kun Wu Yuan-Yi Li Chao-He Xu School of Science Chongqing Key Laboratory of New Energy Storage Materials and DevicesChongqing University of TechnologyChongqing 400054China JINSHAN Science&Technology(Group)Co. Lid.Lhongqing 401120China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China College of Aerospace Engineering Chongqing UniversityChongqing 400044China

Zinc-air batteries(ZABs)offer tremendous potential in various industries and daily life due to their excellent energy density,safety and ***,the practical application of ZABs has been severely hindered by challenges such as high low round-trip efficiencies and overpotential,primarily attributed to the inherent sluggish kinetics in the oxygen evolution reaction(OER)of air *** address these issues effectively and economically,heterojunction engineering accompanied by interfacial chemistry emerges as an ideal approach to designing efficient OER ***,a novel heterogeneous interfacial chemical structure,namely NiCoP/NiFe LDH(layered double hydroxide),needle-like NiCoP and NiFe LDH nanosheets were assembled from cores and shells,***,the NiCoP/NiFe LDH-based ZABs have an exceptionally long cycle life of 238 h,far superior to Pt/C+Ir/C batteries(~97 h).Theoretical calculations and experimental results demonstrate that NiCoP/NiFe LDH possesses tunable interfacial chemistry,demonstrating significant electronic,coordination,geometric and synergistic *** enhancements dramatically improve the active site density,intrinsic activity and electrochemical durability of the *** summary,this work provides a solid foundation for the development of costeffective OER electrocatalysts for electrochemical energy devices.

关键词： Zinc-air batteries Oxygen evolution reaction Interface catalysis Coupling effects Theoretical simulation

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Synergetic effects of gold-doped copper nanowires with low Au content for enhanced electrocatalytic CO_(2)reduction to multicarbon products

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Nano Research 2023年第5期16卷 7777-7783页

作者： Zongnan Wei Shuai Yue Shuiying Gao Minna Cao Rong Cao Department of Chemistry University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of Chinese Academy of Sciences Beijing 100049China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

As efficient catalysts of electrochemical CO_(2)reduction reaction(CO_(2)RR)towards multicarbon(C_(2+))products,Cu-based catalysts have faced the challenges of increasing the reactive activity and ***,we decorated the surface of Cu nanowires(Cu NWs)with a small amount of Au nanoparticles(Au NPs)by the homo-nucleation *** the Au to Cu mass ratio is as little as 0.7 to 99.3,the gold-doped copper nanowires(Cu-Au NWs)could effectively improve the selectivity and activity of CO_(2)RR to C_(2+)resultants,with the Faradaic efficiency(FE)from 39.7%(Cu NWs)to 65.3%,the partial current density from 7.0(Cu NWs)to 12.1 mA/cm^(2) under−1.25 V *** hydrogen electrode(RHE).The enhanced electrocatalytic performance could be attributed to the following three synergetic *** addition of Au nanoparticles caused a rougher surface of the catalyst,which allowed for more active sites ***,Au sites generated*CO intermediates spilling over into Cu sites with the calculated efficiency of 87.2%,which are necessary for multicarbon ***,the interphase electron transferred from Cu to Au induced the electron-deficient Cu,which favored the adsorption of*CO to further generate multicarbon *** results uncovered the morphology,tandem,electronic effect between Cu NWs and Au NPs facilitated the activity and selectivity of CO_(2)RR to multicarbons.

关键词： electrochemical CO_(2)reduction multicarbon production bimetallic catalyst Cu nanowires Au nanoparticles

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