检索结果-南通市图书馆

First observation results of Macao science Satellite-1 on lightning-induced electron precipitation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science China Earth sciences 2025年第1期68卷 1-10页

作者： Yongping WANG Yixin SUN Qiugang ZONG Gaopeng LU Xudong GU Ze-Jun HU Bin LI Key Laboratory for Polar science Ministry of Natural ResourcesPolar Research Institute of ChinaShanghai 200136China Institute of Space Physics and applied Technology Peking UniversityBeijing 100871China State Key Laboratory of Lunar and Planetary science Macao University of Science and TechnologyMacao 999078China school of Earth and Space sciences University of Science and Technology of ChinaHefei 230026China school of Electronic Information Wuhan UniversityWuhan 430072China

The Medium-energy Electron Spectrometers(MES)is a space-borne instrument onboard Macao science Satellite-1(MSS-1)dedicated to monitoring the typical charged particle radiation characteristics in the satellite orbit and the process of their occurrence and development,including short bursts of lightning-induced electron precipitation(LEP).This paper presents the first results of the LEP measurements by the MSS-1.47 LEP events are identified with the routine operation for 3 months since satellite launch,all within the range of 1.5

关键词： Lightning-induced electron precipitation Inner radiation belts Energetic electrons Macao science Satellite-1

维普期刊数据库

Investigation on Cu promotion effect on Ce-based solid solution-anchored Rh single atoms for three-way catalysis

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2025年第2期36卷 574-578页

作者： Jianing He Xiao Wang Zijian Wang Ruize Jiang Ke Wang Rui Zhang Huilin Wang Baokang Geng Hongyi Gao Shuyan Song Hongjie Zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences school of applied Chemistry and Engineering University of Science and Technology of China China school of Materials science and Engineering University of Science and Technology Beijing Department of Chemistry Tsinghua University

The three-way catalyst（TWC）, as a promising approach to control automobile exhaust emission, has been widely studied and applied. However, it still suffers from the high light-off temperature and poor ***, we synthesized a multicomponent catalyst Rh/Cu-CeSn by using Cu metal doping to modify the Ce-based solid solution, which exhibited good TWC catalytic performance: the light-off temperatures for CO, NO, and C3H6conversion are 172 ℃, 266 ℃, and 193 ℃, respectively. Moreover, the catalyst still maintained good activity after 12 h of the continuous reaction under high-temperature conditions. The experiments and mechanism studies reveal that due to the redox pair Cu+/Cu2+, the Cu incorporation can effectively inhibit the Rh transition to the oxidation state and greatly enhance the catalytic activity and stability. This work provides a viable strategy for precise characteristic modulation of composite oxide supports during the fabrication of noble metal-based catalysts, which significantly reduces environmental pollution from energy applications.

关键词： Co-precipitation Oxygen vacancies Rhodium (Rh) catalyst Solid solution Three-way catalysts (TWC)

Magnetically-responsive phase change thermal storage materials:Mechanisms,advances,and beyond

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第2期101卷 485-510页

作者： Yan Gao Yang Li Jinjie Lin Panpan Liu Xiao Chen Ge Wang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory of Function Materials for Molecule & Structure Construction School of Materials Science and Engineering University of Science and Technology Beijing school of Physics and Astronomy Beijing Normal University Shunde graduate school University of Science and Technology Beijing

Rapid advances in thermal management technology and the increasing need for multi-energy conversion have placed stringent energy efficiency requirements on next-generation shape-stable composite phase change materials(PCMs).Magnetically-responsive phase change thermal storage materials are considered an emerging concept for energy storage systems,enabling PCMs to perform unprecedented functions(such as green energy utilization,magnetic thermotherapy,drug release,etc.).The combination of multifunctional magnetic nanomaterials and PCMs is a milestone in the creation of advanced multifunctional composite ***,a timely and comprehensive review of composite PCMs based on magnetic nanoparticle modification is still ***,we furnish an exhaustive exposition elucidating the cutting-edge advancements in magnetically responsive composite *** delve deeply into the multifarious roles assumed by distinct nanoparticles within composite PCMs of varying dimensions,meticulously scrutinizing the intricate interplay between their architectures and thermophysical ***,we prognosticate future research trajectories,delineate alternative stratagems,and illuminate prospective *** review is intended to stimulate broader academic interest in interdisciplinary fields and provide valuable insights into the development of next-generation magnetically-responsive composite PCMs.

关键词： Magnetic nanoparticles Magnetic-thermal conversion Phase change materials Response mechanism Thermal energy storage

Spatio-temporal patterns and climatic drivers of spring phenology in eight forest communities across the north-south transitional zone of China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Geographical sciences 2025年第1期35卷 17-38页

作者： ZHU Wenbin LU Yu Institute of Geographic sciences and natural Resources Research CASBeijing100101China school of Geographical science Nanjing University of Information Science&TechnologyNanjing210044China

The Qinba Mountains are climatically and ecologically recognized as the north-south transitional zone of *** of its phenology is critical for comprehending the response of vegetation to climatic *** retrieved the start of spring phenology(SOS)of eight forest communities from the MODIS products and adopted it as an indicator for spring *** analysis,partial correlation analysis,and GeoDetector were employed to reveal the spatio-temporal patterns and climatic drivers of *** results indicated that the SOS presented an advance trend from 2001 to 2020,with a mean rate of−0.473 d yr^(−1).The SOS of most forests correlated negatively with air temperature(TEMP)and positively with precipitation(PRE),suggesting that rising TEMP and increasing PRE in spring would forward and delay SOS,*** dominant factors influencing the sensitivity of SOS to climatic variables were altitude,forest type,and latitude,while the effects of slope and aspect were relatively *** response of SOS to climatic factors varied significantly in space and among forest communities,partly due to the influence of altitude,slope,and aspect.

关键词： spring phenology climatic drivers altitude forest communities lag effect Qinba Mountains

维普期刊数据库

Revealing the difference of Stark tuning rate between interface and bulk by surface-enhanced infrared absorption spectroscopy

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2025年第2期36卷 461-464页

作者： Manyu Zhu Fei Liang Lie Wu Zihao Li Chen Wang Shule Liu Xiue Jiang State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences school of applied Chemistry and Engineering University of Science and Technology of China school of Materials science and Engineering Sun Yat-sen University Research Center for Analytical science College of ChemistryNankai University

Revealing the factors that affect the vibrational frequency of Stark probe at interface is a pre-requirement for evaluating the absolute interfacial electric *** using surface-enhanced infrared absorption(SEIRA) spectroscopy,attenuated total reflection (ATR) spectroscopy and molecular dynamics (MD),we reveal the assembled C≡N at gold nanofilm exhibits a reduced Stark tuning rate (STR) referring to the vibrational frequency shift in response to electric field comparing with the bulk which was regulated by the electron transfer between S and *** findings lead to a deeper understanding of the vibrational Stark effect at the interface and provide guidance for improving the interface electric field theory.

关键词： Attenuated total reflection spectroscopy Cyano group Stark tuning rate Surface-enhanced infrared spectroscopy Vibrational stark effect

Mesh-supported V2O5-WO3/TiO2 nanosheet array catalysts for efficient removal of NOx

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Tungsten 2025年第1期7卷 100-111页

作者： Zhi-Qi Zhang Liu Yang Wen Luo Vladimir An Jing Li Bao-Dan Liu school of Materials science and Engineering Northeastern University Foshan graduate school of Innovation Northeastern University Kizhner Research Center School of Advanced Manufacturing Technologies Tomsk Polytechnic University

The design and synthesis of vanadium-based denitration catalysts with low-temperature activity pose significant challenges in the field of toxic gas *** this study,we have developed a novel approach to fabricate highly efficient V2O5-WO3/TiO2monolithic mesh catalysts for NOxreduction at low ***,TiO2nanosheets with strong adhesion and large surface area were grown on Ti mesh using plasma electrolytic oxidation technology and hydrothermal ***,super-small traces of WO3and V2O5active nano-species were subsequently deposited on TiO2nanosheets using the deposition-precipitation *** to traditional ceramic-based V2O5-WO3/TiO2catalysts,our V2O5-WO3/TiO2monolithic mesh catalyst exhibits superior mechanical performance,excellent thermal conductivity,lower pressure drop,higher utilization of active components,and stronger synergistic ***,the V2O5-WO3/TiO2monolithic mesh catalysts exhibited excellent low-temperature catalytic activity with 98% of NOxconversion at 220℃,and remarkable long-term SO2tolerance and water resistance in the selective catalytic reduction（SCR） of NOxwith *** SCR reaction of tiny V2O5and WO3active species supported on TiO2nanosheets directly demonstrated to follow the Eley-Rideal mechanism by in situ infrared spectra.

关键词： Low temperature activity Monolithic mesh catalysts NH3-SCR SO2 tolerance V2O5-WO3/TiO2

Damage analysis caused by ^(60)Co ions in functionally graded materials

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Defence Technology(防务技术) 2025年第2期44卷 248-256页

作者： Zübeyde Özkan Ugur Gökmen Sema Bilge Ocak Department of Advanced Technologies Graduate School of Natural and Applied SciencesGazi UniversityAnkara06560Turkiye Department of Metallurgical and Materials Engineering Faculty of TechnologyGazi UniversityAnkara 06560Turkiye Basic and Engineering sciences Central Laboratory Application and Research Center Gazi UniversityAnkara 06560Turkiye

Functionally graded composite/hybrid materials(FGCM/FGHCM)were produced by adding B_(4)C,TiO_(2),and B_(4)C+TiO_(2)ceramic materials at various ratios(0-50%)into the AA6082 *** analysis of the damage caused by^(60) ions'(1.173-1.1332 MeV)on the material was examined using the SRIM/TRIM Monte Carlo simulation *** the simulation,the following data regarding the atoms of the target materials were obtained:ion distribution,target ionization,total displacements,surface binding energy,lattice binding energy,and displacement *** the studied four materials,the one with the highest ion range value was found to be AA6082 with ***_(2)was found to be the reinforcement material that reduced the ion range the most in the *** to its high binding energy,B_(4)C reinforced AA6082+(0-50%)B_(4)C FGCM was found to have the least vacancy with 4782/ion.

关键词： SRIM/TRIM Damage analysis AA6082 ^(60)Co ion

Unsupervised multiplex graph diffusion networks with multi-level canonical correlation analysis for multiplex graph representation learning

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

science China(Information sciences) 2025年第03期68卷 66-79页

作者： Sichao FU Qinmu PENG Yange HE Baokun DU Bin ZOU Xiao-Yuan JING Xinge YOU school of Electronic Information and Communications Huazhong University of Science and Technology Platform Operation and Marketing Center JD Retail Faculty of Mathematics and Statistics Hubei Key Laboratory of Applied Mathematics Hubei University school of Computer science Wuhan University

In recent years, unsupervised multiplex graph representation learning(UMGRL) has received increasing research interest, which aims to learn discriminative node features from the multiplex graphs supervised by data without the guidance of labels. Although these designed UMGRL methods have obtained great success in various graph-related tasks, most existing UMGRL models still have the following issues: highly depending on complex self-supervised strategies(i.e., data augmentation,pretext tasks, and negative pairs sampling), restricted receptive fields, and only aggregating low-frequency information between nodes. In this paper, we propose a simple unsupervised multiplex graph diffusion network(UMGDN) with the aid of multi-level canonical correlation analysis to solve the above issues. Specifically, we first decouple the feature transform and propagation processes of the graph convolution layer to further improve the generalization of the learnable parameters. And then, we propose adaptive diffusion propagation to capture long-range dependency relationships between nodes, not the local neighborhood interactions. Finally, a multi-level canonical correlation analysis loss on both the feature transform and propagation processes is proposed to maximize the correlation of the same node features from multiple graphs for guiding model optimization. Compared to the existing UMGRL models, our proposed UMGDN does not need to introduce any data augmentation, negative pairs sampling techniques, complex pretext tasks, and also adaptively aggregates the optimal frequency information between nodes to generate more robust node embeddings. Extensive experiments on four popular datasets and two graph-related tasks demonstrate the effectiveness of the proposed method.

关键词： unsupervised multiplex graph representation learning graph neural networks node classification node clustering

同方期刊数据库

Tailoring BaCe0.7Zr0.1(Dy0.1|Yb0.1)0.2O3-δ electrolyte through strategic Cu doping for low temperature proton conducting fuel cells:Envisioned theoretically and experimentally

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第2期101卷 692-701页

作者： Zaheer Ud Din Babar Muhammad Bilal Hanif Yan'an Li Wan-Ting Wang Hanchen Tian Cheng-Xin Li State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University Department of Inorganic Chemistry Faculty of Natural Sciences Comenius University Bratislava

This study addresses the challenge of high sintering temperatures in proton-conducting fuel cells（PCFCs）with BaCeO3-doped *** demonstrate that 1 mol% copper（Cu） doping at the B-site of BaCe0.7Zr0.1(Dy0.1|Yb0.1)0.2O3-δ（BCZDYb） improves sintering behavior,enabling densification at1400℃.However,Cu doping disrupts stoichiometry,creating barium vacancies and reducing protonaccepting cations,affecting overall *** mechanism is confirmed through density functional theory（DFT） calculations and various experimental techniques,including crystal structure analysis using X-ray diffraction（XRD） and morphology and elemental analysis via field emission scanning electron microscopy（FESEM） and energy-dispersive X-ray spectroscopy（EDS）.Electrochemical measurements are performed using the electrochemical impedance spectroscopy（EIS）.The ionic conductivity of1 mol% Cu-doped BCZDYb（BCZDYb-1） is 1.49×10-2S cm-1at 650℃,which is～3.58 times higher than that of BCZDYb sintered at 1200℃.The BCZDYb-1 exhibits ～16 times higher grain boundary conductivity when sintered at 1400℃,compared to undoped *** single cell employing BCZDYb-1 as the electrolyte achieved a power density of ～606 mW cm-2at 550℃.These results indicate that a controlled amount of Cu doping can enhance densification while maintaining high ionic co nductivity,making it suitable for practical applications in PCFCs operating at lower temperatures.

关键词： BaCe0.7Zr0.1(Dy0.1|Yb0.1)0.2O3−δ (BCZDYb) Cu-doping Densification Electrical conductivity Proton conducting fuel cells (PCFCs) Sintering