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Synthesis and Properties of Heat-resistant Polyimides Films Containing Crosslinkable Group-tetrafluorostyrene

Chinese Journal of Polymer science 2025年第5期43卷 863-874页

作者： Tian-Yong Zhang Jia-Ning Yu Sui-Sui Wang Ya-Mei Chai Shuang Jiang Hong-Li An Ruo-Xi Sun Bin Li Tianjin Key Laboratory of Applied Catalysis Science and Technology School of Chemical Engineering and TechnologyTianjin UniversityTianjin300354China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin300072China Tianjin Engineering Research Center of Functional Fine Chemicals Tianjin300354China

Polyimide(PI)is widely used in high-tech fields such as microelectronics,aerospace,and national defense because of its excellent optical properties,high-and low-temperature resistance,and good dimensional *** achieve the desired properties of PI,the monomers 2,6-diaminopyrimidin-4-ol(DAPD)and 6-(2,3,5,6-tetrafluoro-4-vinylphenoxy)pyrimidin-2,4-diamine(DAFPD),which contains crosslinkable functional groups,were designed and synthesized successfully and copolymerized with 4,4'-oxydianiline(ODA)and 4,4-hexafluoroisopropylphthalic anhydride(6FDA).The prepared PI film(PI-3),with rigid backbones and loose packing had excellent heat resistance(Td5%=489℃)and optical properties(T450=82%).Furthermore,a crosslinked PI film(c-PI-3)with more heat-resistant(Td5%=524℃)and better mechanical properties(σ=125.46MPa),can be obtained through thermal crosslinking of *** addition,the changes in the properties caused by the proportion of DAFPD added during copolymerization are discussed *** study provides a promising candidate for heat-resistant PI materials.

关键词： Polyimide film Copolymerization Thermal crosslinking Heat resistance

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Promoted reverse water-gas shift activity on transition metals-incorporated iron-cerium oxide solid solution catalyst

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Progress in Natural science:Materials International 2024年第4期34卷 676-681页

作者： Yi Xie Wenhao Qin Linyu Wang Yueren Liu Haoyang Jiang Miao Zhong College of Engineering and Applied Sciences National Laboratory of Solid State Microstructures The Frontiers Science Center for Critical Earth Material Cycling Nanjing University

Earth-abundant Fe oxide-based catalysts, renowned for their broad-spectrum light absorption, hold promise for driving the photothermal RWGS reaction—a promising strategy for converting CO2emissions into valuable carbonaceous feedstocks. However, traditional Fe oxide-based catalysts exhibit limited activity due to their constrained H2dissociation and CO2activation capabilities, especially at lower temperatures. This study introduces Co, Ni, and Cu-doped Ce0.7Fe0.3O2solid-solution catalysts. Incorporation of Fe into CeO2enhances CO2dissociation while preserving extensive light adsorption up to 2500 nm. Notably, Co doping enhances H2dissociation and promotes CO2activation. Subsequent investigations reveal that a catalyst doped with 5 mol% Co exhibits the highest photothermal catalytic activity, attaining a ～50 % CO2conversion under 300 W Xe-lamp irradiation with excellent selectivity and stability over 10 reaction cycles spanning 10 h. These results underscore the potential of designing CeO2-based solid solution catalysts with synergistic metal dopants for efficient and selective CO2conversion under moderate conditions.

关键词： Reverse water-gas shift reaction Solid solution Ceria Iron-based catalyst Transition metal doping

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A Composite Ansatz for Calculation of Dynamical Structure Factor

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Chinese Physics Letters 2024年第1期41卷 92-103页

作者：张玉佩莫崇杰张平康炜 HEDPS Center for Applied Physics and Technologyand School of PhysicsPeking UniversityBeijing 100871China Beijing Computational Science Research Center Beijing 100193China Institute of Applied Physics and Computational Mathematics Beijing 100088China HEDPS Center for Applied Physics and Technologyand College of EngineeringPeking UniversityBeijing 100871China

We propose an ansatz without adjustable parameters for the calculation of a dynamical structure *** ansatz combines the quasi-particle Green’s function,especially the contribution from the renormalization factor,and the exchange-correlation kernel from time-dependent density functional theory together,verified for typical metals and semiconductors from a plasmon excitation regime to the Compton scattering *** has the capability to reconcile both small-angle and large-angle inelastic x-ray scattering(IXS)signals with muchimproved accuracy,which can be used as the theoretical base model,in inversely inferring electronic structures of condensed matter from IXS experimental signals *** may also be used to diagnose thermal parameters,such as temperature and density,of dense plasmas in x-ray Thomson scattering experiments.

关键词： excitation inverse verified

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Optical Fiber Hydrogen Sensor Based onπ-Phase-Shifted Grating and Sputtered Pd/Hf Composite Film

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Photonic Sensors 2025年第2期15卷 34-44页

作者： Fan ZHANG Fabian BUCHFELLNER Wenbin HU Wenxin AO Qiang BIAN Johannes ROTHS Minghong YANG National Engineering Research Center for Optical Fiber Sensing Technology and Network Wuhan 430070China Photonics Lab Munich University of Applied ScienceMunich 80335Germany

A novel optical fiber hydrogen sensor based on theπ-phase-shifted grating and partial coated Pd/Hf composite film is proposed and experimentally demonstrated in this *** hydrogen sensitive Pd/Hf film with the length of 4 mm is successfully deposited in theπ-phase-shifted grating region by the magnetron sputtering process and rotating fixture *** the hydrogen sensitivity between the notch and flank wavelengths of theπ-phase-shifted grating is different due to the partial coating only on theπ-phase-shifted grating region,the relative shift between the notch and flank wavelengths is employed to characterize the hydrogen concentration in this *** hydrogen calibration results show that the sensor shows the good response and *** the temperature of 20 and℃the hydrogen concentration of 2%,the wavelength distance shifts of 200 nm and 500 nm Pd/Hf coatings are 12.6 pm and 33.5 pm,respectively.

关键词： Fiber-optic hydrogen sensor Pd/Hf composite film π-phase-shifted grating magnetron sputtering temperature decoupling

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Integrated Model for Resilience Evaluation of Power-Gas Systems Under Windstorms

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1427-1440页

作者： Yucui Wang Yongbiao Yang Qingshan Xu School of Cyber Science and Engineering Southeast UniversityNanjing 210096China School of Electrical Engineering Southeast UniversityNanjing 210096China Nanjing Center for Applied Mathematics Nanjing 210096China

Integrated power-gas systems(IPGS)have developed critical infrastructure in integrated energy ***,various extreme weather events with low probability and high risk have seriously affected the stable operation of *** to close interconnectedness through coupling elements between the power system(PS)and natural gas system(NGS)when a disturbance happens in one system,a series of complicated sequences of dependent events may follow in another *** under extreme conditions,this coupling can lead to a dramatic degradation of system performance,resulting in catastrophic ***,there is an urgent need to model and evaluate resilience of IPGSs under extreme *** this development trend,an integrated model for resilience evaluation of IPGS is proposed under extreme weather events focusing on ***,a framework of IPGS is proposed to describe states of the system at different stages under disaster ***,an evaluation model considering cascading effects is used to quantify the impact of windstorms on NGS and ***,a Monte Carlo simulation(MCS)technique is utilized to characterize chaotic fault of ***,time-dependent nodal and system resilience indices for IPGS are proposed to display impacts of *** results on the IPGS test system demonstrate the proposed methods.

关键词： Cascading effects integrated power-gas systems nodal resilience indices optimal power flow model resilience assessment system resilience indices windstorms

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Solidification process of ABO3-type perovskites:Kinetic two-phase growth method with optimized potential

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材料科学技术（英文版） 2025年第2期205卷 204-211页

作者： Yunjiao Peng Zhigang Ding Guirong Su Huaiyu Hou Wei Liu Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

The functional properties of ABO3-type perovskite materials have garnered extensive attention,yet their solidification properties have remained challenging to investigate due to high-temperature environments and characterization *** this study,molecular dynamics simulations are employed to compre-hensively explore the melting,quenching,and crystal growth processes of SrTiO3(STO)structural *** iterative fitting and optimization of ion effective charge,a set of potential functions capable of accurately simulating the high-temperature melting of STO are *** melting point obtained for STO(2403 K)using the two-phase coexistence method closely corresponds to the empirical value(2333 K),affirming the precision of the optimized *** the molten STO yields an amor-phous structure characterized primarily by Ti-O six-fold coordination,which increased by 13.09％when reduced to 300 K at a cooling rate of 0.1 K/***,the results for different cooling rates revealed that slower cooling rates and lower temperatures yielded more ordered amorphous *** circumvent the formation of amorphous states during crystal growth of perovskite materials,we have developed a kinetic two-phase growth(KTPG)*** approach regulates the cooling rate within a solid-liquid two-phase system,maintaining constant low supercooling at the interface to mimic STO crystal growth *** at 0.01 K/ps to 1760 K leads to a notable transformation,with the percentage of Ti-O six-fold coordination reaching 90％.This signifies substantial progress in achieving crystal growth through this method,highlighting its efficacy in facilitating crystal formation from the melt phase.

关键词： Molecular dynamics simulation Interatomic potential Melting point Amorphous structure Crystal growth

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Analysis of thermal management and anti-mechanical abuse of multi-functional battery modules based on magneto-sensitive shear thickening fluid

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applied Mathematics and Mechanics(English Edition) 2024年第3期45卷 529-542页

作者： Yang XIONG Bo LU Yicheng SONG Junqian ZHANG Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Frontier Science Center of MechanoinformaticsShanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China Zhejiang Laboratory Hangzhou 311100China

Electric vehicles(EVs)have garnered significant attention as a vital driver of economic growth and environmental ***,ensuring the safety of high-energy batteries is now a top priority that cannot be overlooked during large-scale *** paper proposes an innovative active protection and cooling integrated battery module using smart materials,magneto-sensitive shear thickening fluid(MSTF),which is specifically designed to address safety threats posed by lithium-ion batteries(LIBs)exposed to harsh mechanical and environmental *** theoretical framework introduces a novel approach for harnessing the smoothed-particle hydrodynamics(SPH)methodology that incorporates the intricate interplay of non-Newtonian fluid behavior,capturing the fluid-structure coupling inherent to the *** approach is further advanced by adopting an enhanced Herschel-Bulkley(H-B)model to encapsulate the intricate rheology of the MSTF under the influence of the magnetorheological effect(MRE)and shear thickening(ST)*** simulation results show that in the case of cooling,the MSTF is an effective cooling medium for rapidly reducing the *** terms of mechanical abuse,the MSTF solidifies through actively applying the magnetic field during mechanical compression and impact within the battery module,resulting in 66%and 61.7%reductions in the maximum stress within the battery jellyroll,and 31.1%and 23%reductions in the reaction force,*** mechanism effectively lowers the risk of short-circuit *** groundbreaking concepts unveiled in this paper for active protection battery modules are anticipated to be a valuable technological breakthrough in the areas of EV safety and lightweight/integrated design.

关键词： magneto-sensitive shear thickening fluid(MSTF) battery module impact protection temperature control integrated design

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Functionalization of covalent organic frameworks via multicomponent reactions

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science China Chemistry 2024年第12期67卷 3906-3914页

作者： Xue-Hui Liu Peng-Lai Wang Wei Wang San-Yuan Ding State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringMOE Frontiers Science Center for Rare IsotopesLanzhou UniversityLanzhou 730000China

Functionalized covalent organic frameworks(COFs)represent a fascinating class of porous materials that have attracted widespread interest due to their modifiable structures and impressive potential ***,the construction of functionalized COFs remains difficult as it requires simultaneous consideration of robust linkages,diversified structures,and tailorable ***,the introduction of multicomponent reactions(MCRs)into COF synthesis opens new avenues for creating highly stable and function-oriented COF materials,marking a significant advance in the development of *** minireview summarizes the types of MCRs used in COF synthesis,highlights the functionalization strategies of COFs via MCRs,and provides insights on the key challenges and future frontiers in this field.

关键词： covalent organic frameworks multicomponent reactions functionalization strategies

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Enhanced MADM Strategy with Heptapartitioned Neutrosophic Distance Metrics

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Neutrosophic Sets and Systems 2025年 78卷 74-96页

作者： Eassa, Mohamed Myvizhi, M. Elkholy, Mohamed Abdelhafeez, Ahmed Elbehiery, Hussam Computer Science Department Faculty of Information System and Computer Science October 6 University Giza12585 Egypt Applied Science Research Center Applied Science Private University Amman Jordan Department of Mathematics KPR Institute of Engineering and Technology Tamilnadu Coimbatore India Faculty of Computer Science& Engineering Alamein International University Egypt

In this work, a novel methodological approach to multi-attribute decision-making problems is developed and the notion of Heptapartitioned Neutrosophic Set Distance Measures (HNSDM) is introduced. By averaging the Penta-Partitioned Neutrosophic Distance Measures under particular conditional criteria, the suggested technique ranks the options. Additionally, we explore the fundamental characteristics of HNSDM and provide several illustrative theorems. The Heptapartitioned Neutrosophic Set Distance Measures are formulated based on the Hepta Neutrosophic Set. Lastly, a practical numerical example is provided to illustrate the efficacy of the suggested methodology. © 2025, University of New Mexico. All rights reserved.

关键词： Heptapartitioned Neutrosophic set Heptapartitioned Neutrosophic set and MADM strategy Heptapartitioned set Neutrosophic sine distance measure

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Tightly focused properties of a partially coherent radially polarized power-exponent-phase vortex beam

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Chinese Physics B 2023年第2期32卷 303-310页

作者：陈康马志远胡友友 Department of Optoelectronic Information of Science and Engineering School of ScienceJiangsu University of Science and TechnologyZhenjiang 212100China Applied Optics Research Center Jiangsu University of Science and TechnologyZhenjiang 212100China

A partially coherent beam called a radially polarized multi-Gaussian Schell-model power-exponent-phase vortex beam is introduced. Both the analytical formula of the beam propagating through the high-numerical-aperture objective lens based on the vectorial diffraction theory, and the cross-spectral density matrix of the beam in the focal region are derived. Then,the tight focusing characteristics of the partially coherent radially polarized power-exponent-phase vortex beam are studied numerically, and the intensity distribution, degree of polarization and coherence of the beams in the focusing region with different topological charge, power order, beam index and coherence width are analyzed in detail. The results show that the contour of the spot becomes clearer and smoother with the increase in the beam index, and the focal fields of different structures that include the flattened beam can be obtained by changing the coherence width. In addition, by changing the topological charge and power order, the intensity can gather to a point along the ring. These unique properties will have potential applications in particle capture and manipulation, especially in the manipulation of irregular particles.

关键词： partially coherent beam power-exponent-phase vortex beam tight focusing properties

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