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Influence of Er_2O_3 content on microstructure and mechanical properties of ZTA-TiO_2 composites

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Journal of Rare Earths 2019年第3期37卷 299-304页

作者： Yudong Sui li'na han Yehua Jiang Quan Shan School of Materials Science and Engineering Kunming University of Science and Technology

The influence of Er_2 O_3 addition on the phase evolution and mechanical properties of sintered(1600 ℃,4 h) ZTA(yttria stabilized zirconia toughened alumina)-TiO_2 composites was investigated. The SEM and XRD results reveal the formation of a new erbium zirconium oxide,Zr_3 Er_4 O_(12),with a granulate morphology when Er_2 O_3 content is higher than 1 wt%. The grain sizes of both Al_2 O_3 and yttria-stabilized zirconia phases decrease with an increase in the Er_2 O_3 content. The relative density, Vickers hardness and fracture toughness of the composites are found to be strongly dependent on their grain sizes, relative densities and the formation of the Zr_3 Er_4 O_(12) secondary phases. The composite with 5 wt% Er_2 O_3 shows the highest relative density(99.93%), Vickers hardness(1752 HV) and fracture toughness(7.92 MPa·m^(1/2)).

关键词： Er2O3 Microstructure Vickers hardness Fracture toughness ZTA-TiO2 ceramic composite Rare earths

Optimizing near-carbon-free nuclear energy systems:advances in reactor operation digital twin through hybrid machine learning algorithms for parameter identification and state estimation

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Nuclear Science and Techniques 2024年第8期35卷 177-203页

作者： li‑Zhan Hong He‑lin Gong Hong‑Jun Ji Jia‑liang Lu han li Qing li Paris Elite Institute of Technology Shanghai Jiao Tong UniversityShanghai 200240China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610041China

Accurate and efficient online parameter identification and state estimation are crucial for leveraging digital twin simulations to optimize the operation of near-carbon-free nuclear energy *** previous studies,we developed a reactor operation digital twin(RODT).However,non-differentiabilities and discontinuities arise when employing machine learning-based surrogate forward models,challenging traditional gradient-based inverse methods and their *** study investigated deterministic and metaheuristic algorithms and developed hybrid algorithms to address these *** efficient modular RODT software framework that incorporates these methods into its post-evaluation module is presented for comprehensive *** methods were rigorously assessed based on convergence profiles,stability with respect to noise,and computational *** numerical results show that the hybrid KNNLHS algorithm excels in real-time online applications,balancing accuracy and efficiency with a prediction error rate of only 1%and processing times of less than 0.1 ***,algorithms such as FSA,DE,and ADE,although slightly slower(approximately 1 s),demonstrated higher accuracy with a 0.3%relative L_2 error,which advances RODT methodologies to harness machine learning and system modeling for improved reactor monitoring,systematic diagnosis of off-normal events,and lifetime management *** developed modular software and novel optimization methods presented offer pathways to realize the full potential of RODT for transforming energy engineering practices.

关键词： Parameter identification State estimation Reactor operation digital twin Reduced order model Inverse problem

Realization of high-purity 1T-MoS_(2)by hydrothermal synthesis through synergistic effect of nitric acid and ethanol for supercapacitors

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Journal of Materials Science & Technology 2022年第28期123卷 34-40页

作者： han li Hui li Ziqiang Wu lili Zhu Changdian li Shuai lin Xuebin Zhu Yuping Sun Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China High Magnetic Field Laboratory HFIPSChinese Academy of SciencesHefei 230031China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Phase engineering of molybdenum disulfide(MoS_(2))can achieve phase transformation from the semiconducting phase(2H-MoS_(2))with poor conductivity to the metallic phase(1T-MoS_(2))with superior electrochemical ***,it is desirable to prepare high concentration 1T-MoS_(2)by simple and facile *** this work,MoS_(2)with high concentration of 1T phase is successfully prepared by one-pot hydrothermal synthesis through the synergistic effect of HNO_(3)and CH_(3)CH_(2)OH,which is stable for more than half of a *** as-synthesized MoS_(2)shows high capacitance of 392Fg^(-1)at 1A g^(-1)as used for supercapacitors electrodes,and displays excellent capacitance retention(83%after 10,000 cycles).Asymmetric supercapacitors(ASCs)devices assembled by the as-synthesized MoS_(2)and MnO_(2)on carbon cloths,exhibit high energy and power densities(0.194 m Wh cm^(-2)and 13.466 mW cm^(-2)).These results shed a light to realize 1T phase MoS_(2)through the synergistic effect in hydrothermal processing.

关键词： MoS_(2) Metallic phase Synergistic effect Hydrothermal synthesis Supercapacitor

Biodegradable Foaming Material of Poly(butylene adipate-co-terephthalate)(PBAT)/Poly(propylene carbonate)(PPC)

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Chinese Journal of Polymer Science 2022年第2期40卷 208-219页

作者： han-lin Tian Ze-Peng Wang Shi-ling Jia Hong-Wei Pan li-Jing han Jun-Jia Bian Ying li Hui-li Yang Hui-liang Zhang Changchun University of Technology School of Chemical EngineeringChangchun 130012China Key Laboratory of Polymer Ecomaterials Chinese Academy of SciencesChangchun Institute of Applied ChemistryChangchun 130022China Jilin COFCO Biochemistry Packaging Co. Ltd.Liaoyuan 136300China

A biodegradable blend foaming material of poly(butylene adipate-co-terephthalate)(PBAT)/poly(propylene carbonate)(PPC)was successfully prepared by chemical foaming agent and screw extrusion ***,PBAT was modified by bis(tert-butyl dioxy isopropyl)benzene(BIBP)for chain extension,and then the extended PBAT(E-PBAT)was foamed with PPC using a twin(single)screw *** analyzing the properties of the blends,we found that Young’s modulus increased from 58.8 MPa of E-PBAT to 244.7 MPa of E-PBAT/PPC 50/*** viscosity of the polymer has a critical influence on the formation of *** with neat PBAT(N-PBAT),the viscosity of E-PBAT increased by 3396 Pa·s and E-PBAT/PPC 50/50 increased by 8836 Pa·***,the dynamic mechanical analysis(DMA)results showed that the storage modulus(E’)at room temperature increased from 538 MPa to 1650 *** various phase morphologies(“sea-island”,“quasi-co-continuous”and“cocontinuous”)and crystallinity of the blends affected the spread velocity of gas and further affected the foaming morphology in E-PBAT/PPC ***,through the analysis of phase morphology and foaming mechanism,we concluded that the E-PBAT/PPC 70/30 component has both excellent strength and the best foaming performance.

关键词： Poly(butylene adipate-co-terephthalate) Poly(propylene carbonate) Phase structure Biodegradable foam Extrusion foaming

Synthesis,insecticidal activity and stability study of novel nitromethylene neonicotinoids with five-membered aromatic heterocycles

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Chinese Chemical Letters 2023年第6期34卷 391-394页

作者： li han Zihao Yuan Xusheng Shao Xiaoyong Xu Zhong li Shanghai Key Laboratory of Chemical Biology School of PharmacyEast China University of Science and TechnologyShanghai 200237China Shanghai Collaborative Innovation Center for Biomanufacturing Technology Shanghai 200237China

Twenty-four novel neonicotinoid analogues with nitromethylene and five-membered aromatic heterocycles were designed and *** target molecular structures have been confirmed by analytical and spectral *** compounds exhibited notable insecticidal activities against aphid(Aphis medicaginis)and brown planthopper(Nilaparvata lugens).The aqueous stability test confirmed that the stabilities of those compounds were superior to the leading compound,and the photostability was even better than that of imidacloprid.

关键词： Nitromethylene Neonicotinoids Selective reduction Stability Insecticidal activity

Micromechanical mode-localized electric current sensor

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Microsystems & Nanoengineering 2022年第2期8卷 49-58页

作者： han li Zhao Zhang Luhan Zu Yongcun Hao Honglong Chang Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace School of Mechanical EngineeringNorthwestern Polytechnical University127 Youyi West RoadBeilin DistrictXi'an 710072China

This paper outlines the design of a novel mode-localized electric current sensor based on a mechanically sensitive element of weakly coupled resonator *** the advantage of a high voltage sensitivity of weakly coupled resonator systems,the current under test is converted to voltage via a silicon shunt resistor,which causes stiffness perturbation to one *** mode-localization phenomenon alters the energy distribution in the weakly coupled resonator system.A theoretical model of current sensing is established,and the performance of the current sensor is determined:the sensitivity of the electric current sensor is 567/A,the noise floor is 69.3 nAA/Hz,the resolution is 183.6 nA,and the bias instability is 81.6 *** mode-localized electric current sensor provides a new approach for measuring sub-microampere currents for applications in nuclear physics,including for photocurrent signals and transistor leakage *** could also become a key component of a portable mode-localized multimeter when combined with a mode-localized *** addition,it has the potential for use in studying sensor arrays to achieve higher resolution.

关键词： mode weakly resonator

Acute myocardial necrosis caused by aconitine poisoning:A case report

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World Journal of Clinical Cases 2022年第33期10卷 12416-12421页

作者： Yu-Ping liao li-han Shen li-Hua Cai Jie Chen han-Quan Shao Department of Critical Care Medicine Dongguan People’s HospitalDongguan 523058Guangdong ProvinceChina

BACKGROUND Herbal medicine has a long history of use in the prevention and treatment of disease and is becoming increasingly popular ***,there are also widespread concerns about its *** them,the cardiotoxicity of aconitine has been *** SUMMARY We report a case of a 61-year-old male with aconitine poisoning presenting with malignant arrhythmia and severe cardiogenic shock,which was successfully managed with aggressive advanced life support and heart *** This is the first case wherein in vivo cardiac pathology was obtained,confirming that aconitine caused acute myocardial necrosis.

关键词： Aconitine ECMO Myocardial necrosis Ventricular arrhythmia Herbal medicine Case report

Effect of Solvent Annealing Temperature on Crystal Modifications and Phase Transition Behavior of Regioregular Poly(3-octylthiophene)

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Chinese Journal of Polymer Science 2014年第9期32卷 1158-1166页

作者： Xiao-jun Wang Yuan Yuan li-li han Xia Dong 张建明 Key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plasticsQingdao University of Science & Technology

In present study, the effect of the solvent annealing temperature on the crystal modifications and the phase transition behavior of the subsequently dried poly（3-octylthiophene）（P3OT） film has been investigated by the combination of DSC, WAXD and FTIR techniques. When chloroform is employed as the solvent, it is unexpectedly found that form I and form II crystal modifications of P3OT could be respectively obtained by room temperature and low temperature annealing. Comparing to the mostly used solvent reported for preparing form II, i.e. carbon disulfide （CS2） which is toxic and corrosive, chloroform is less toxic and corrosive and more suitable for solution processing of P3OT. Therefore, this finding provides an alternative way to obtain form II. By temperature dependent IR spectroscopy, the structural evolution of P3OT during the form II to form I phase transition process has also been studied in detail.

关键词： P3OT Crystal modification FTIR.

Flow-Induced Vibration Fatigue Damage of A Pair of Flexible Cylinders in A Staggered Array

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China Ocean Engineering 2021年第6期35卷 878-890页

作者： XU Wan-hai li Yu-han JIA Kun LAI Jiang State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China Nuclear Power Institute of China Chengdu 610041China

Flow-induced vibration(FIV)of a group of long,flexible cylinders involves a complex interaction between fluid and *** a substantial number of studies have been devoted to assessing FIV response behaviours,fatigue damage features of staggered flexible cylinders are not fully ***,the wake-induced flutter constitutes an intricate hydrodynamic behaviour that frequently occurs when one cylinder is in the vicinity of another ***,existing studies on the fatigue damage caused by wake-induced flutter are incapable of achieving better *** paper,therefore,estimates the FIV fatigue damage of two staggered flexible cylinders with an aspect ratio of 350 and a mass ratio of 1.90 based on normal S−N curves according to Det Norske Veritas(DNV)*** staggered cases(cross-flow spacing ratios of 2.0,3.0,4.0,and 6.0 and in-line spacing ratios of 4.0,6.0,and 8.0)are discussed for comparison,and fatigue damage caused by wake-induced flutter is thoroughly *** damage results indicate that the variation of the cross-flow(CF)spacing ratio has a greater influence than that of the in-line(IL)spacing ratio on the CF fatigue damage of the upstream *** IL fatigue damages of the upstream cylinder are observed when reduced velocity V_(r)≥15.03 due to the wake flow patterns with different IL spacing ***,wake interference,especially wake-induced flutter,predominates the fatigue damage characteristics of the downstream *** V_(r)=8.77−11.27,wake-induced flutter enhances the IL fatigue damage of the downstream cylinder and slightly affects that of the upstream ***,wake-induced flutter causes considerable IL fatigue damage disparity between the two staggered cylinders by suppressing the IL fatigue damage of the upstream cylinder when V_(r)≥20.04.

关键词： flow-induced vibration fatigue damage flexible cylinder staggered arrangement wake-induced flutter