检索结果-内蒙古大学图书馆

Vertically grown MoS_(2)nanosheets on graphene with defect-rich structure for efficient sodium storage

Rare Metals 2024年第3期43卷 1062-1071页

作者： Ying Wang Jia-Peng He Han-Qing Pan Qing-Peng Wang Lei Zhang Yong-Chang Liu Qing-Hong Wang School of Chemistry&Materials Science Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional MaterialsJiangsu Normal UniversityXuzhou221116China Institute of Biopharmaceutical Research Liaocheng UniversityLiaocheng252059China Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyState Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing100083China Centre for Catalysis and Clean Energy Gold Coast CampusGriffith UniversityGold CoastQLD4222Australia

The synthesis of a perpendicular growth structure of MoS_(2)nanosheets on graphene for efficient sodium storage is challenging yet ideal due to the benefits of open ion diffusion channels and high electronic *** this study,we have successfully fabricated a novel structure of vertical MoS_(2)nanosheets on graphene,with ZnS nanoparticles serving as bonding points(MoS_(2)/ZnS/G),through a facile hydrothermal *** the synthesis process,Zn^(2+)not only acts as a landing site for the vertical growth of MoS_(2)nanosheets but also triggers the formation of a defect-rich structure in the final *** unique architecture of MoS_(2)/ZnS/G effectively combines the advantages of a vertically aligned geometry and a defectrich structure for energy *** resulting structure displays shortened transport paths for electrons/ions,enhanced conductivity,improved structural integrity,and an increased number of active sites for promising electrochemical *** expected,when used as anode for sodium-ion batteries,the as-synthesize d MoS_(2)/ZnS/G exhibits excellent rate capability(high capacity of 298 mAh·g^(-1)at 5 A·g^(-1))and good cycling stability(a capacity decay of 0.056%per cycle after 500 cycles at 1 A·g^(-1)).According to the kinetic investigations,the electrochemical process of the MoS_(2)/ZnS/G sample is primarily governe d by a pseudocapacitive behavior,which enhances the charge/discharge kinetics and allows the MoS_(2)/ZnS/G structure to remain intact during cycling.

关键词： MoS_(2) Perpendicular growth Graphene Sodium storage Electrochemical performance

来源：评论

学校读者我要写书评

暂无评论

Cascade multi-output PET image super-resolution reconstruction based on multi-channel input 16

Cascade multi-output PET image super-resolution reconstructi...

引用

16th International Conference on Digital Image Processing, ICDIP 2024

作者： Wang, Xiangdong Wang, Huabin Pei, Qingwang Tang, Yuanyuan Anhui Provincial International Joint Research Center for Advanced Technology in Medical Imaging School of Computer Science and Technology Anhui University Anhui Hefei230601 China

ISBN: (数字)9781510682917

ISBN: (纸本)9781510682900

Positron Emission Tomography (PET) images suffer from low spatial resolution, resulting in suboptimal visual effects and the inability to effectively display subtle pathological areas, hindering the early detection of potential issues. To address this problem, we propose a cascade multi-output super-resolution reconstruction method based on multi-channel input. Firstly, we construct a cascade super-resolution model by introducing degradation functions to refine the LR-to-HR mapping range. Through gradual super-resolution reconstruction, we comprehensively consider information loss and deformation issues during the image resolution reduction process, providing more accurate and higher-quality super-resolution reconstruction results. Secondly, we introduce high-resolution CT images to accurately restore image texture details by incorporating additional high-frequency detail information and maintain overall image consistency by the integration of extra structural information. Finally, we incorporate region-based super-resolution detection information to adaptively reconstruct different areas of the image, avoiding distortion caused by excessive super-resolution and blurriness resulting from insufficient super-resolution. Experimental results demonstrate that our approach outperforms other methods, with SSIM, PSNR, and RMSE metrics reaching 0.9607, 34.9438, and 0.0201, respectively, achieving state-of-the-art performance. Furthermore, visual experiments demonstrate a significant improvement in the resolution of the reconstructed PET images using the method proposed in this paper. This effectively compensates for the deficiencies in the original images, providing strong support for the early detection of potential issues. © 2024 SPIE.

关键词： Positron emission tomography

来源：评论

学校读者我要写书评

暂无评论

Sulfur poisoned PtNi/C catalysts toward two-electron oxygen reduction reaction for acidic electrosynthesis of hydrogen peroxide

引用

Journal of Materials science & technology 2025年第1期204卷 268-275页

作者： Xin Yang Lijie Zhong Songxin Ye Dequan He Shuxian Yuan Huixin Li Yuting Ma Xiaocheng Mo Shiyu Gan Li Niu Center for Advanced Analytical Science Guangzhou Key Laboratory of Sensing Materials&DevicesGuangdong Engineering Technology Research Center for Photoelectric Sensing Materials&DevicesKey Laboratory of Optoelectronic Materials and Sensors in Guangdong Provincial UniversitiesSchool of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China School of Chemical Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China

Selective electrocatalysis of two-electron oxygen reduction reaction(2e^(-)ORR)has been recognized as a sustainable and on-site process for hydrogen peroxide(H_(2)O_(2))*** progress has been achieved for 2e^(-)ORR in alkaline ***,it is challenged by insufficient activity and selectiv-ity of the catalysts in acidic ***,we report sulfur-poisoned PtNi/C catalysts(PtNiSx/C)that could regulate ORR from the 4e^(-)to 2e^(-)*** identified PtNiS0.6/C offers high activity in terms of onset potential of∼0.69 V(***)and∼80%*** mass activity is also compara-ble and outperforms representative Pt-based precious and transition-metal-based *** addition,it is interestingly found that the Faradaic efficiency further increased to 95%during the long-term elec-trolysis test due to Ni atom surface *** electrochemical production of the H_(2)O_(2)system was applied to the electro-Fenton process,which has realized the effective degradation of organic *** work offers a strategy by sulfur poisoning PtNi/C catalyst to realize Pt-based 2e^(-)ORR active catalysts to electrolysis of H_(2)O_(2)in acidic media.

关键词： Oxygen reduction reaction Hydrogen peroxide Acidic media Electrocatalysis

来源：评论

学校读者我要写书评

暂无评论

Modeling and Validation of Precipitate Formation During the Heat Treatment of 50CrMo4 Steel 28

Modeling and Validation of Precipitate Formation During the ...

引用

28th Congress of the International Federation for Heat Treatment and Surface Engineering, IFHTSE 2023

作者： Austin, Abigail Autenrieth, Hermann Dietrich, Stefan Pundt, Astrid Schulze, Volker Robert Bosch GmbH Center for Research and Advanced Engineering Renningen71272 Germany Institute for Applied Materials - Materials Science and Engineering Karlsruhe Institute of Technology Karlsruhe76131 Germany

ISBN: (纸本)9781713889533

In the manufacture of steel products, heat treatment plays an influential role in the properties of the steel. During this process, several changes at the microstructure level take place to help achieve the desired properties. One such occurrence is the nucleation, growth, and coarsening of precipitates. Factors such as temperature and time can affect the type of precipitate, its shape, size, number density etc. in the microstructure. These in turn affect the final mechanical properties. Knowledge of the precipitates formed can be a strategic step in further understanding the microstructure behavior and optimizing the heat treatment parameters. This study focuses on 50CrMo4 martensitic steel with carbide precipitation. 50CrMo4 was subjected to range of tempering process parameters i.e., varying tempering temperatures and times. Carrying out detailed experiments to analyze the carbides over a wide range of process parameters is time-consuming and costly. In this case, a physics-based model of the precipitation is sensible to predict the behavior of the metal under a particular heat treatment process. A modelling approach such as JMA (Johnson-Mehl-Avrami) was used to determine parameters like the volume fraction of the carbides during isothermal holding while tempering. Other parameters, such as the number density and the size of the carbides, were also modelled to give a complete picture of precipitate formation. The kinetics of the carbides was successfully determined through modelling for tempering time ranging from a few seconds to hours. Scanning and transmission electron microscopy investigations coupled with image analysis provide experimental data for the carbides in the heat-treated specimens. The physics-based model results are validated using these experimental data. The model results are in accordance with the experimental results. The physics-based model combined with the available experimental data can provide results with increased accuracy. This predic

关键词： Carbides

来源：评论

学校读者我要写书评

暂无评论

Investigating inexpensive polymeric 3D printed materials under extreme thermal conditions

引用

Materials Futures 2022年第1期1卷 101-112页

作者： Jan Lukas Storck Guido Ehrmann Jana Uthoff Elise Diestelhorst Tomasz Blachowicz Andrea Ehrmann Faculty of Engineering and Mathematics Bielefeld University of Applied Sciences33619 BielefeldGermany Virtual Institute of Applied Research on Advanced Materials(VIARAM) Institute of Physics-Center for Science and Education Silesian University of Technology44-100 GliwicePoland

3D printing is nowadays used for many applications far beyond pure rapid *** tools to prepare custom-made objects which may be highly complex,different 3D printing techniques have emerged into areas of application where the mechanical,thermal,optical and other properties have to meet high *** them,applications for space,*** microsatellites,make extreme demands regarding the stability under high ***,polymeric 3D printed materials have several advantages for space application in comparison with metal *** we thus investigate the impact of temperatures up to 85◦C and 185◦C,respectively,on typical 3D printing materials for fused deposition modeling or stereolithography(SLA)with inexpensive 3D *** materials are found to differ strongly in terms of mechanical properties and dimensional stability after the treatment at a higher temperature,with SLA resins and co-polyester showing the best dimensional stability,while acrylonitrile–butadiene–styrene and SLA resin after long UV post-treatment has the best mechanical properties.

关键词： additive manufacturing polymers space microsatellites thermal stability dimensions mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Bunch-length measurement at a bunch-by-bunch rate based on time–frequency-domain joint analysis techniques and its application

引用

Nuclear science and Techniques 2024年第4期35卷 165-175页

作者： Hong-Shuang Wang Xing Yang Yong-Bin Leng Yi-Mei Zhou Ji-Gang Wang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230026China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China

This paper presents a new technique for measuring the bunch length of a high-energy electron beam at a bunch-by-bunch rate in storage *** technique uses the time–frequency-domain joint analysis of the bunch signal to obtain bunch-by-bunch and turn-by-turn longitudinal parameters,such as bunch length and synchronous *** bunch signal is obtained using a button electrode with a bandwidth of several *** data acquisition device was a high-speed digital oscilloscope with a sampling rate of more than 10 GS/s,and the single-shot sampling data buffer covered thousands of *** bunch-length and synchronous phase information were extracted via offline calculations using Python *** calibration coefficient of the system was determined using a commercial streak ***,this technique was tested on two different storage rings and successfully captured various longitudinal transient processes during the harmonic cavity debugging process at the Shanghai Synchrotron Radiation Facility(SSRF),and longitudinal instabilities were observed during the single-bunch accumulation process at Hefei Light Source(HLS).For Gaussian-distribution bunches,the uncertainty of the bunch phase obtained using this technique was better than 0.2 ps,and the bunch-length uncertainty was better than 1 *** dynamic range exceeded 10 *** technology is a powerful and versatile beam diagnostic tool that can be conveniently deployed in high-energy electron storage rings.

关键词： Bunch-by-bunch diagnostic Bunch-length measurement Synchronous phase measurement Joint time–frequency-domain analysis Longitudinal instability

来源：评论

学校读者我要写书评

暂无评论

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

引用

Chinese Chemical Letters 2025年第2期36卷 433-436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 SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China Research Center for Analytical Science College of ChemistryNankai UniversityTianjin 300071China

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

来源：评论

学校读者我要写书评

暂无评论

Manufacturing of ceramic cores:From hot injection to 3D printing

引用

Journal of Materials science & technology 2023年第3期134卷 95-105页

作者： Qiaolei Li Tianci Chen Jingjing Liang Chaowei Zhang Jinguo Li Yizhou Zhou Xiaofeng Sun School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shichangxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Space Manufacturing Technology(CAS Key Lab) Beijing 100094China

With the improvement of aero-engine performance,the preparation of hollow blades of single-crystal superalloys with complex inner cavity cooling structures is becoming increasingly *** ceramic core is the key intermediate part of the preparation and has attracted wide *** meet this challenge,new technologies that can make up for the defects of long periods and high costs of fabricating complex structural cores by traditional hot injection technology are *** photopolymerization 3D printing ceramic technology has been applied to the core field to realize the rapid preparation of complex structural ***,the industrial application of this technology still needs further research and ***,ceramic cores were prepared using traditional hot injection and vat photopolymerization 3D printing techniques using fused silica,nano-ZrO_(2),and Al_(2)O_(3) powders as starting *** 3D printed ceramic core has a typical layered structure with a small pore size and low *** of the layered structure,the pore area is larger than that of the hot injection ceramic core,the leaching performance has little effect(0.0277 g/min for 3D printing cores,0.298 g/min for hot injection cores).In the X and Y directions,the sintering shrinkage is low(2.7%),but in the Z direction,the shrinkage is large(4.7%).The fracture occurs when the inner layer crack expands and connects with the interlayer crack,forming a stepped fracture in the 3D-printed *** bending strength of the 3D printed core at high temperature(1500℃)is 17.3 *** analyses show that the performance of vat photopolymerization 3D-printed ceramic cores can meet the casting requirements of single crystal superalloy blades,which is a potential technology for the preparation of complex structure ceramic *** research mode of 3D printing core technology based on the traditional hot injection process provides an effective new idea for promoting the industrial applicati

关键词： Ceramic cores 3D printing Hot injection Anisotropic Layer structure

来源：评论

学校读者我要写书评

暂无评论

Evolution of electrical conductivity and semiconductor to metal transition of iron oxides at extreme conditions

引用

Chinese Physics B 2022年第8期31卷 95-100页

作者： Yukai Zhuang Qingyang Hu Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China Center for High Pressure Science and Technology Advanced Research(HPSTAR) Beijing 100094China

Iron oxides are widely found as ores in Earth's crust and are also important constituents of its *** polymorphism,composition changes,and electronic structures play essential roles in controlling the structure and geodynamic properties of the solid *** all-natural occurring iron oxides are semiconductors or insulators at ambient pressure,they start to metalize under *** in this work,we review the electronic conductivity and metallization of iron oxides under high-pressure conditions found in Earth's lower *** summarize that the metallization of iron oxides is generally controlled by the pressure-induced bandgap closure near the Fermi *** metallization,they possess much higher electrical and thermal conductivity,which will facilitate the thermal convection,support a more stable and thicker D′′layer,and formulate Earth's magnetic field,all of which will constrain the large-scale dynamos of the mantle and core.

关键词： high pressure metallization iron oxides electrical conductivity

来源：评论

学校读者我要写书评

暂无评论

Pressure-driven symmetry breaking and electron disproportionation of the trigonal Nb_(3)cluster in Nb_(3)Cl_(8)

引用

science China(Physics,Mechanics & Astronomy) 2022年第7期65卷 153-158页

作者： Zimin Jiang Dequan Jiang Yiming Wang Chen Li Ke Liu Ting Wen Fuyang Liu Zhengyang Zhou Yonggang Wang Center for High Pressure Science and Technology Advanced Research(HPSTAR) Beijing 100094China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 201899China

Symmetry breaking of metal cluster-based strongly correlated systems can give rise to collective ***,the twodimensional Nb_(3) cluster compound Nb_(3)Cl_(8) is shown to suffer dramatic symmetry breaking and electron disproportionation under compression.A structural phase transition from trigonal P–3m1 to monoclinic C2/m is observed near 8 GPa with the three-fold symmetry *** disproportionation occurs on Nb_(3) clusters from delocalized Nb^(8/3+)Nb^(8/3+)Nb^(8/3+)to localized Nb^(3+)Nb^(3+)Nb^(2+),which results in a subtle bandgap discontinuity,as evidenced by electrical transport and UV-Vis absorption measurements.

关键词： Nb_(3)Cl_(8) symmetry breaking electron disproportionation layered semiconductor high pressure

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：