检索结果-内蒙古大学图书馆

Dry basal plane graphene wrappings on spherical nickel-rich oxide layered particles for lithium-ion batteries

Journal of Energy Chemistry 2025年第5期104卷 10-19页

作者： Van-Chuong Ho Thanh N.Huynh Thi Huong Pham Hyun-seung Kim Hun-Gi Jung Ki Jae Kim Seung-Min Oh Young-Jun Kim Junyoung Mun School of Advanced Materials Science and Engineering Sungkyunkwan University SKKU Advanced Institute of Nano Technology (SAINT) Sungkyunkwan University Advanced Batteries Research Center Korea Electronics Technology Institute Energy Storage Research Center Korea Institute of Science and Technology KIST-SKKU Carbon-Neutral Research Center Sungkyunkwan University Department of Energy Science Sungkyunkwan University SKKU Institute of Energy Science and Technology (SIEST) Sungkyunkwan University Battery Cell Development Team 1 Research & Development Division Hyundai Motor Company Department of Nano Engineering Sungkyunkwan University

Particle-to-particle dry graphene coatings on Ni-rich layered oxide materials are proposed for highenergy lithium-ion batteries （LIBs） to mitigate the inherent and engineering challenges related to the electrochemically fragile surfaces,as well as limiting electrode thickness and *** a shear stress-based coating process without supplementary solvent or heat treatment,graphene sheets derived from graphene powder are applied onto the surface of spherical LiNi0.89Co0.055Mn0.055O2（NCM） *** process achieves a coating thickness equivalent to or fewer than 10 layers of graphene and exposes the basal *** graphene-coated material increases particle hardness and mitigates degradation caused by inter-particle pressure,enabling the formation of high-density electrodes without *** the absence of additional carbon-conducting agents for the high-density composite electrode with a density of 4.0 g cm-3,it significantly enhances rate capability,demonstrating more than 5 times improvement by achieving 149.4 mAh g-1at 2 C compared to the bare sample (28.9 mAh g-1).Furthermore,the dry graphene coating enables the high areal capacity of 6.98 mAh *** exposing the basal plane of the graphene coating,the process enhances chemical stability,effectively inhibiting side reactions at the interface and mitigating cycle degradation.

关键词： Basal-plane coating Dry graphene coating High areal capacity High electrical conductivity Particle-to-particle

来源：评论

学校读者我要写书评

暂无评论

Cyclic quenching treatment doubles the Charpy V-notch impact energy of a 2.3 GPa maraging steel

引用

材料科学技术（英文版） 2025年第6期209卷 311-328页

作者： Xinlei Zhou Chunni Jia Peng Mi Honglin Zhang Wei Yan Wei Wang Mingyue Sun Sybrand van der Zwaag Lijian Rong School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016PR China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016PR China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016PR China China Aerodynamics Research and Development Center Mianyang 621000PR China Faculty of Aerospace Engineering Delft University of TechnologyDelftNetherlands

A cyclic quenching treatment(CQT)succeeded in turning a 2.3 GPa maraging steel with a Charpy impact energy of 9 J into a new grade with the same strength but a Charpy impact energy of 20 J upon 4 cyclic *** improvement of mechanical properties is attributed to the refinement and increased chemical heterogeneity of the martensitic substructure,rather than the refinement of prior austenite grain(PAG),as well as the Transformation-Induced Plasticity(TRIP)effect facilitated by small austenite *** role of local segregation of Ni during CQT in the formation of Ni-rich austenite grains,Ni-rich martensite laths and Ni-poor martensite laths,was investigated and verified by DICTRA *** study highlights the important influence of Ni partitioning behavior during CQT,providing insights into microstructural evolution and mechanical properties.

关键词： Maraging steel Cyclic quenching treatment Ni partitioning Ultrafine lath Austenite Toughness

来源：评论

学校读者我要写书评

暂无评论

A Three-Dimensional SPH Simulation of Lander Footpad Impact on a Lunar Regolith Bed

引用

Computer Modeling in Engineering & Sciences 2025年第2期142卷 2045-2066页

作者： Wanqing Yuan Huiying Xie Can Huang Xiaoliang Wang Qingquan Liu Department of Mechanics School of Aerospace EngineeringBeijing Institute of TechnologyBeijing100081China Institute of Computational Aerodynamics China Aerodynamics Research and Development CenterMianyang621000China Institute of Large Structures for Advanced Industrial Equipment Beijing Institute of TechnologyZhuhai519088China

Landing spacecraft experience significant impact forces during landing,resulting in large deformation and failure in the soil surface,which severely affects landing safety and *** paper establishes a smoothed particle hydrodynamics(SPH)model based on the theory of soil elastoplastic constitutive relations to describe the process of a lander’s footpad impacting lunar regolith *** model can provide engineering indices such as impact load and penetration depth,and illustrate the large deformation and crater characteristics of the regolith.A detailed analysis of the response of the footpad and lunar regolith during landing reveals that the process can be broadly divided into two stages of rapid penetration and oscillatory ***,there are significant similarities in the landing process under different landing velocities and footpad *** research investigates the large deformation and crater characteristics of the lunar regolith *** results demonstrate two failure modes in the *** the impact of a footpad with a smaller mass,the final failure surface of the regolith exhibits a bowl-shaped profile with a uniformly open *** contrast,under the impact of a footpad with a larger mass,the final failure surface of the regolith presents an urn-shaped profile with a large abdomen and a small ***,the impact craters in both scenarios show a bowl-like *** cases of high-velocity impacts,the impact crater exhibits obvious blocky spalling on its *** SPH model developed in this study can be applied to predict the large deformation and failure response of lunar soil under the impact of rigid structures as well as the impact load and penetration *** effectively predicts the dynamic response of the landing process,which is expected to provide a reference for engineering design.

关键词： SPH footpad load lunar regolith impact crater

来源：评论

学校读者我要写书评

暂无评论

Fabrication of Wafer-Bonded 2D CMUT Array with Glass-Filled Trenches 38

Fabrication of Wafer-Bonded 2D CMUT Array with Glass-Filled ...

引用

38th IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2025

作者： Oh, Chaerin Park, Seyoung Park, Jongcheol Jung, Joontaek Lee, Hyunjoo J. Korea Advanced Institute of Science and Technology School of Electrical Engineering Korea Republic of National NanoFab Center Center for Next-Generation Platform Development Korea Republic of

ISBN: (纸本)9798331508890

Precise modulation of the focused beam is a critical technology for improving the performance of ultrasound-based treatments and diagnostics. Beyond conventional 1D transducer arrays, 2D transducer arrays have significantly broadened the scope of beam control applications. Leveraging CMOS compatibility, capacitive micromachined ultrasonic transducers (CMUT) have been regarded as an effective approach to fabricating 2D transducer arrays in a compact form. Although wafer-bonded CMUT arrays demonstrate excellent performance, their complex structures, including through-substrate vias and the need for mechanical stability, have posed significant challenges for 2D arrays. To address these challenges, we propose a novel method to enhance mechanical stability by employing a glass-reflow technique to fill the trench. © 2025 IEEE.

关键词： Wafer bonding

来源：评论

学校读者我要写书评

暂无评论

Queue-Based Analytical Modeling for Capacity Estimation of Wearable eHealth Systems

引用

IEEE Transactions on Network Science and Engineering 2025年第3期12卷 2033-2042页

作者： Pathak, Nidhi Mukherjee, Anandarup Misra, Sudip Indian Institute of Technology Kharagpur Advanced Technology Development Center Kharagpur721302 India University of Cambridge Institute for Manufacturing CambridgeCB3 0FS United Kingdom Indian Institute of Technology Kharagpur Department of Computer Science and Engineering Kharagpur721302 India

The heterogeneity in IoT-based health monitoring devices and communication protocols leads to diverse system designs and configurations resulting in uncertain outcomes. Most present-day eHealth approaches focus on optimizing the performance of already designed systems (hardware, network, and software) rather than optimizing the system design itself. A reliable eHealth monitoring system must use appropriate protocols and hardware to avoid data loss and delays. Identifying the magnitude of performance changes when integrating new devices into an already functional eHealth system is also critical. This work addresses these issues by adopting a queuing theory-based analytical model to characterize an eHealth wearable system. This approach acts as a guiding framework for system and network capacity estimation by simulating the dynamics of an eHealth wearable system with selected communication protocols before deployment. The simulation tool identifies the system's limits in terms of delays, the number of simultaneously supported wearables, and packet loss. We identify and examine some well-known wireless connectivity protocols as possible candidates for eHealth wearable systems. The output of the analytical model is compared vis-à-vis data from a real-life proof-of-concept eHealth wearable system. The proposed approach estimates the numbers of served packets and blocked packets with approximate errors of 0.02% and 0.2%, respectively. © 2013 IEEE.

关键词： Queueing theory

来源：评论

学校读者我要写书评

暂无评论

N-doped carbon nanosheets packaged ultra-small FeCoP toward efficient water splitting

引用

International Journal of Hydrogen Energy 2025年 132卷 32-39页

作者： Wei, Peng Ye, Xin Jiao, Jianhua Wu, Fan Zhang, Haodong Wu, Shaoyang Lv, Shanshan Liang, Qirui Ren, Yurong School of Materials Science and Engineering Jiangsu Province Engineering Research Center of Intelligent Manufacturing Technology for the New Energy Vehicle Power Battery Jiangsu Technology Innovation Center for Advanced Power and Energy Storage Batteries Changzhou University Changzhou213164 China Qingdao Innovation and Development Center of Harbin Engineering University Qingdao266400 China Laboratory of Underwater Intelligence Qingdao Innovation and Development Base Harbin Engineering University Qingdao266400 China

Iron phosphide (FeP) has garnered significant attention due to its abundant iron reserves, low cost and impressive hydrogen evolution reaction (HER) activity. Nevertheless, sluggish charge transport, large particle size and poor oxygen evolution reaction (OER) activity make it still difficult to meet the desired practical applications. As we know, heterogeneous element doping, porous two-dimensional structure design, and nanoconfinement control can effectively improve the mass/charge transfer rate and expose more active sites. Hence, ultra-small bimetallic iron-cobalt phosphide nanoparticles encapsulated and dispersed in two-dimensional nitrogen-doped carbon nanosheet (FeCoP@NC) catalysts were successfully constructed. The optimized FeCoP@NC shows outstanding electrocatalytic stability and activity toward OER and HER under alkaline conditions. The overall water splitting performance was further measured by using FeCoP@NC as both anode and cathode, which also delivers good performance indicators. This work provides a new perspective and potential value for the rational design of non-precious metal bifunctional catalysts. © 2025 Hydrogen Energy Publications LLC

关键词： Nanosheets

来源：评论

学校读者我要写书评

暂无评论

Interfacial B-O bonding modulated S-scheme B-doped N-deficient C_(3)N_(4)/O-doped-C_(3)N_(5) for efficient photocatalytic overall water splitting

引用

Chinese Chemical Letters 2025年第1期36卷 355-361页

作者： Entian Cui Yulian Lu Zhaoxia Li Zhilei Chen Chengyan Ge Jizhou Jiang Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng 224051China School of Environmental Ecology and Biological Engineering Key Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationWuhan Institute of TechnologyWuhan 430205China

Photocatalytic overall pure water splitting is a promising method for generating green hydrogen energy under mild ***,this process is often hindered by sluggish electron-hole separation and *** address this,a step-scheme(S-scheme)B-doped N-deficient C_(3)N_(4)/O-doped C_(3)N_(5)(BN-C_(3)N_(4)/O-C_(3)N_(5))heterojunction with interfacial B-O bonds has been *** Pt and Co(OH)_(2) as co-catalysts,BN-C_(3)N_(4)/O-C_(3)N_(5) S-scheme heterojunction demonstrates significantly enhanced photocatalytic activity for overall pure water splitting under visible light,achieving H_(2) and O_(2) evolution rates of 40.12 and 19.62μmol/h,*** characterizations and experiments revealed the performance-enhancing effects of the enhanced built-in electric field and the interfacial B-O ***,the strengthened built-in electric field provides sufficient force for rapid interfacial electron ***,by reducing the transport energy barrier and transfer distance,the interfacial B-O bonds facilitate rapid recombination of electrons and holes with relatively low redox potential via the S-scheme charge-transfer route,leaving the high-potential electrons and holes available for H^(+)reduction and OH^(-)oxidation ***,the photocatalytic efficiency of BN-C_(3)N_(4)/O-C_(3)N_(5) S-scheme heterojunction was significantly improved,making it a promising approach for green hydrogen production through overall pure water splitting.

关键词： Interfacial B-O bonds BN-C_(3)N_(4) O-C_(3)N_(5) S-scheme heterojunction Water splitting

来源：评论

学校读者我要写书评

暂无评论

Performance Analysis of Resource Allocation Algorithms for Vehicle Platoons over 5G eV2X Communication 17

Performance Analysis of Resource Allocation Algorithms for V...

引用

17th International Conference on COMmunication Systems and NETworkS, COMSNETS 2025

作者： Mandal, Gulabi Roy, Anik Palit, Basabdatta Indian Institute of Technology Department of Computer Science and Engineering Kharagpur India Indian Institute of Technology Advanced Technology Development Center Kharagpur India National Institute of Technology Department of Electronics and Communication Engineering Rourkela India

ISBN: (纸本)9798331531195

Vehicle platooning is a cooperative driving technology that can be supported by 5G enhanced Vehicle-to-Everything (eV2X) communication to improve road safety, traffic efficiency, and reduce fuel consumption. eV2X communication among the platoon vehicles involves the periodic transmission of Cooperative Awareness Messages (CAMs) containing vehicle information under strict latency and reliability requirements. These requirements can be maintained by administering the assignment of resources, in terms of time slots and frequency bands, for CAM transmission in a platoon, with the help of a resource allocation mechanism. State-of-the-art on control and communication design for vehicle platoons either consider a simplified platoon model with a detailed communication architecture or consider a simplified communication delay model with a detailed platoon control system. Departing from existing works, we have developed a comprehensive vehicle platoon communication and control framework using OMNET + +, the benchmarking network simulation tool. We have carried out an inclusive and comparative study of three different platoon Information Flow Topologies (IFTs), namely Car-to-Server, Multi-Hop, and One-Hop over 5G using the Predecessor-Leader Following platoon control law to arrive at the best-suited IFT for platooning. Secondly, for the best-suited 5G eV2X IFT, we have analyzed the performance of three different resource allocation algorithms, namely Maximum of Carrier to Interference Ratio (MaxC/I), Proportional Fair (PF), and Deficit Round Robin (DRR). Exhaustive system-level simulations show that the One-Hop information flow strategy along with the MaxC/I resource allocation yields the best Quality of Service (QoS) performance, in terms of latency, reliability, Age of Information (AoI), and throughput. © 2025 IEEE.

关键词： Vehicle to vehicle communications

来源：评论

学校读者我要写书评

暂无评论

An Energy-Efficient Capacitance-to-Digital Converter With Top and Bottom Plate Sampling for Pressure Sensors

引用

IEEE Transactions on Circuits and Systems II: Express Briefs 2025年第5期72卷 678-682页

作者： Xia, Qingjiang Zhou, Fei Niu, Yuze He, Mingzhong Lu, Wengao Zhang, Yacong Chen, Zhongjian Peking University School of Integrated Circuits Beijing Advanced Innovation Center for Integrated Circuits Beijing100871 China Lingfeng Vision Chip Beijing Technology Company Ltd. Technical Development Department Beijing100098 China

This brief presents a 12-bit low-power successive-approximation-register (SAR) capacitance-to-digital converter (CDC) for capacitive pressure sensors. It adopts a capacitance-to-voltage front-end (CVFE) scheme to decouple the capacitive digital-to-analog converter (CDAC) from the sensor capacitor, enabling a large swing of the SAR analog-to-digital converter (ADC) and a wide capacitance sensing range. To improve power efficiency, this brief proposed a top and bottom sampling (TBS) for CVFE circuit to achieve a single-ended sampling while differential conversion. The TBS includes only one sampling phase, which relaxes the amplifier’s bandwidth requirements, thereby reducing the power consumption of the CVFE. The prototype chip was fabricated using a 180-nm CMOS process. The measured capacitance resolution is 1.76 fF and the measurement capacitance range is from 0.63 pF to 38.37 pF. The proposed CDC consumes 3.90 µW with a 128 µs conversion time, bringing a power efficiency of 80.6 fJ/conversion-step. © 2004-2012 IEEE.

关键词： Partial pressure sensors

来源：评论

学校读者我要写书评

暂无评论

In-situ growth of cross-link NiAl-LDH nanosheets on the inner/outer surfaces of carbon microtubes for anti-corrosive electromagnetic wave absorption

引用

Journal of Materials Science and technology 2025年 238卷 109-118页

作者： Liu, Rui Liu, Xiao Wu, Lihong Du, Changlong Lv, Haiming Wan, Gengping Xiong, Hualin Yuan, Xiang Wang, Jieping Wang, Guizhen Institute of Electromagnetic Protection Materials and Spectral Innovation Technology State Key Laboratory of Tropic Ocean Engineering Materials and Materials Evaluation School of Materials Science and Engineering Hainan University Haikou570228 China Center for New Pharmaceutical Development and Testing of Haikou Center for Advanced Studies in Precision Instruments Haikou570228 China Key Laboratory of Pico Electron Microscopy of Hainan Province Center for Advanced Studies in Precision Instruments Haikou570228 China

Electromagnetic wave (EMW) absorbers with anti-corrosion property are highly desired to enhance the durability of military targets in harsh condition. Herein, cross-link NiAl-layered double hydroxide (NiAl-LDH) nanosheets on the inner/outer surfaces of carbon microtubes (CMTs) are ingeniously constructed through the combination of atomic layer deposition technique and a hydrothermal method. The obtained NiAl-LDH/CMT composite exhibits excellent EMW absorption and corrosion resistance performance. The large internal cavity of CMT significantly enhances impedance matching. The uniform distribution of NiAl-LDH nanosheets on both the inner and outer surfaces of CMT generates numerous heterogeneous interfaces that induce substantial polarization loss. Consequently, at a filler rate of only 5 wt.%, the NiAl-LDH/CMT composite exhibits a minimum reflection loss of −60.2 dB and a maximum effective absorption bandwidth of 5.9 GHz. In addition, the combined high impermeability of CMT and the effective Cl−-trapping ability of NiAl-LDH endows NiAl-LDH/CMT composite with outstanding corrosion protection property in simulated seawater environment. Furthermore, the PO43− anions are effectively incorporated into the NiAl-LDH interlayer via anion exchange, which can further enhance corrosion protection capacity through surface inactivation from slow-release PO43− anions without reducing their EMW absorption performance. In summary, this work can give guidance for the development of efficient anti-corrosion EMW absorption materials. © 2025

关键词： Anodic protection

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：