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Designing hard wear-resistant conductors by introducing high-plasma-energy heterogeneous metals into transition metal nitrides

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Journal of Materials Science & technology 2023年第26期157卷 213-219页

作者： Yuankai Li Chaoquan Hu Yao Wu Zhenan Qiao Yifan Cheng Zhiqing Gu Gang Gao Weitao Zheng State Key Laboratory of Superhard Materials Key Laboratory of Automobile Materials of Ministry of EducationSchool of Materials Science and EngineeringJilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsJilin UniversityChangchun 130012China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China SINOPEC Star Co.Ltd. Beijing 100083China Key Laboratory of Medical Electronics and Digital Health of Zhejiang Province College of Information Science and EngineeringJiaxing UniversityJiaxing 314001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130025China

*** Hard and wear-resistant conductors(HWCs)refer to functional films with simultaneously high hardness,high wear resistance,and good electrical *** have important applica-tions such as next-generation sliding electrical contacts,high-end conductive probe-tip,and oval hole guides for the precision rolling mill[1-4],which has drawn extensive research ***,it is still challenging to integrate high hardness,super wear resis-tance,and high electrical conductivity in one ***-ally,researchers have mainly alloyed the highly conductive met-als Cu,Au,and Pt to improve their hardness and wear resistance.

关键词： wear high electrical

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A Novel Extensible Simulation Framework for CXL-Enabled systems

arXiv

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arXiv 2024年

作者： An, Yuda Yi, Shushu Mao, Bo Li, Qiao Zhang, Mingzhe Zhou, Ke Xiao, Nong Sun, Guangyu Wang, Xiaolin Luo, Yingwei Zhang, Jie Computer Hardware and System Evolution Laboratory Peking University China Computer Hardware and System Evolution Laboratory Xiamen University China Institute of Information Engineering Chinese Academy of Sciences China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology China Sun Yat-sen University China Beijing Advanced Innovation Center for Integrated Circuits China

Compute Express Link (CXL) serves as a rising industry standard, delivering high-speed cache-coherent links to a variety of devices, including host CPUs, computational accelerators, and memory devices. It is designed to promote system scalability, enable peer-to-peer exchanges, and accelerate data transmissions. To achieve these objectives, the most recent CXL protocol has brought forth several innovative features, such as port-focused routing, device-handled coherence, and PCIe 6.0 compatibility. However, due to the limited availability of hardware prototypes and simulators compatible with CXL, earlier CXL research has largely depended on emulating CXL devices using remote NUMA nodes. Unfortunately, these NUMA-based emulators have difficulties in accurately representing the new features due to fundamental differences in hardware and protocols. Moreover, the absence of support for non-tree topology and PCIe links makes it complex to merely adapt existing simulators for CXL simulation. To overcome these problems, we introduce ESF, a simulation framework specifically designed for CXL systems. ESF has been developed to accurately reflect the unique features of the latest CXL protocol from the ground up. It uses a specialized interconnect layer to facilitate connections within a wide range of system topologies and also includes key components to carry out specific functions required by these features. By utilizing ESF, we thoroughly investigate various aspects of CXL systems, including system topology, device-handled coherence, and the effects of PCIe characteristics, leading to important findings that can guide the creation of high-performance CXL systems. The ESF source codes are fully open-source and can be accessed at https://***/r/ESF-1CE3. Copyright © 2024, The Authors. All rights reserved.

关键词： HTTP

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Pre-Equalization Aided Grant-Free Massive Access in Massive MIMO system

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IEEE Transactions on Vehicular technology 2025年

作者： Wang, Yueqing Mei, Yikun Gao, Zhen Wan, Ziwei Ning, Boyu Mi, De Muhaidat, Sami School of Information and Electronics Beijing Institute of Technology Beijing100081 China Beijing Institute of Technology MIIT Key Laboratory of Complex-Field Intelligent Sensing Beijing100081 China Yangtze Delta Region Academy Jiaxing314019 China Beijing Institute of Technology Advanced Technology Research Institute Jinan250307 China University of Electronic Science and Technology of China National Key Laboratory of Wireless Communications Chengdu611731 China Birmingham City University School of Computing and Digital Technology BirminghamB55JU United Kingdom Khalifa University KU 6 G Research Center Department of Computer and Information Engineering Abu Dhabi United Arab Emirates

The spatial diversity and multiplexing advantages of massive multi-input-multi-output (mMIMO) can significantly improve the capacity of massive non-orthogonal multiple access (NOMA) in machine type communications. However, state-of-the-art grant-free massive NOMA schemes for mMIMO systems require accurate estimation of random access channels to perform activity detection and the following coherent data demodulation, which suffers from excessive pilot overhead and access latency. To address this, we propose a pre-equalization aided grant-free massive access scheme for mMIMO systems, where an iterative detection scheme is conceived. Specifically, the base station (BS) firstly activates one of its antennas (i.e., beacon antenna) to broadcast a beacon signal, which facilitates the user equipment (UEs) to perform downlink channel estimation and pre-equalize the uplink random access signal with respect to the channels associated with the beacon antenna. During the uplink transmission stage, the BS detects UEs' activity and data by using the proposed iterative detection algorithm, which consists of three modules: coarse data detection (DD), data-aided channel estimation (CE), and fine DD. In the proposed algorithm, the joint activity and DD is firstly performed based on the signals received by the beacon antenna. Subsequently, the DD is further refined by iteratively performing data-aided CE module and fine DD module using signals received by all BS antennas. Our simulation results demonstrate that the proposed scheme outperforms state-of-the-art mMIMO-based grant-free massive NOMA schemes with the same access latency. © 1967-2012 IEEE.

关键词： Channel estimation

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Enhancing Flexibility of Smart Bioresorbable Vascular Scaffolds Through 3d Printing Using Polycaprolactone and Polylactic Acid

SSRN

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SSRN 2024年

作者： Wei, Jinlian Oyunbaatar, Nomin-Erdene Jeong, Yun-Jin Park, Jongsung Kim, Su-Hwan Kwon, Kyeongha Lee, Heonzoo Won, Yonggwan Kim, Dong-Su Lee, Dong-Weon School of Mechanical Engineering Chonnam National University Gwangju61186 Korea Republic of Department of Automatic System Chosun College of Science & Technology Gwangju61453 Korea Republic of Department of Precision Mechanical Engineering Kyungpook National University Gyeongsangbuk-do Sangju37224 Korea Republic of School of Electrical Engineering Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Department of Intelligent Electronics and Computer Engineering Chonnam National University Gwangju61186 Korea Republic of Gwangju61012 Korea Republic of

With the growing use of stent implantations, the risk of in-stent restenosis represents a major concern for cardiovascular patients. Herein, we propose a hybrid bioresorbable vascular scaffold (H-BVS) integrated with a wireless sensor that could enable significant advances in cardiovascular therapeutics. The H-BVS was manufactured using a state-of-the-art customized 3D printer equipped with dual nozzles to ensure a synergistic combination of polycaprolactone and polylactic acid. Moreover, the H-BVS was integrated with a wireless, battery-less LC-type pressure sensor for real-time monitoring of in-stent restenosis. This wireless sensor was meticulously connected with the H-BVS framework through engineered microstructures, which not only ensured a robust bond but also significantly enhanced the overall integrity and functionality of the device. Furthermore, the combination of the H-BVS and sensor was optimized to exhibit superior bending flexibility and radial strength, which are key factors in ensuring effectiveness and patient safety. The feasibility of the smart H-BVS (SH-BVS) was verified through comprehensive testing within a phantom system designed to simulate real blood flow conditions. We believe that the potential of the SH-BVS system to revolutionize patient monitoring and treatment strategies in the cardiovascular healthcare domain cannot be overstated. © 2024, The Authors. All rights reserved.

关键词： Biodegradable polymers

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A New Integrated Fuzzy Optimization Approach for Sustainable Supply Chain Planning Subjected to Sustainability and Uncertain Environments

A New Integrated Fuzzy Optimization Approach for Sustainable...

引用

Computer Science and Data engineering (CSDE), IEEE Asia-Pacific Conference on

作者： Noppasorn Sutthibutr Kunihiko Hiraishi Navee Chiadamrong Suttipong Thajchayapong School of Manufacturing Systems and Mechanical Engineering Sirindhorn International Institute of Technology (SIIT) Thammasat University Pathum Thani Thailand School of Information Science Japan Advanced Institute of Science and Technology (JAIST) Ishikawa Japan Data Science and Analytics Research National Electronics and Computer Technology Center Pathum Thani Thailand

This study proposes an integrated fuzzy optimization approach for sustainable supply chain planning subjected to sustainability and uncertain environments. The proposed approach combines the concept of Chance-Constrained Programming (CCP) with Intuitionistic Fuzzy Linear Programming (IFLP) that decision makers can control risk violation of fuzzy constraints as well as consider satisfaction and non-satisfaction levels simultaneously. The effectiveness of the proposed approach is demonstrated through a case study by minimizing total costs and maximizing supplier's social and environmental scores where costs and customer demands are imprecise. Our comparative result clearly shows that the obtained solution outperforms the result from the traditional integrated fuzzy optimization approach. The advantages of the proposed approach can assist decision-makers to prepare and take necessary actions for future uncertainty, leading to sustainability.

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Quantum Orbital-State Control of a Neutral Nitrogen-Vacancy Center at Millikelvin Temperatures

arXiv

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arXiv 2024年

作者： Kurokawa, Hodaka Nakazato, Shintaro Makino, Toshiharu Kato, Hiromitsu Onoda, Shinobu Sekiguchi, Yuhei Kosaka, Hideo Quantum Information Research Center Institute of Advanced Sciences Yokohama National University 79-5 Tokiwadai Hodogaya Yokohama240-8501 Japan Department of Physics Graduate School of Engineering Science Yokohama National University 79-5 Tokiwadai Hodogaya Yokohama240-8501 Japan Advanced Power Electronics Research Center National Institute of Advanced Industrial Science and Technology 1-1-1 Umezono Ibaraki Tsukuba305-8568 Japan 1233 Watanuki-machi Takasaki Gunma370-1292 Japan

A neutral nitrogen-vacancy center (NV0) is promising for realizing strong coupling with a single microwave photon due to its large electric field sensitivity, although it is susceptible to environmental phonon noise at 5 K. Decreasing the temperature to 15 mK results in a tenfold increase in orbital relaxation time compared to that at 5 K. Dynamical decoupling pulses significantly increase the orbital coherence time to around 1.8 µs, representing a 30-fold improvement compared to that without decoupling pulses. Based on these results, a single NV0 can reach the strong coupling regime when coupled with a high-impedance microwave resonator, thus opening up the possibility of microwave quantum electrodynamics using a single optically-active defect center in diamond. © 2024, CC BY.

关键词： Microwave resonators

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Enabling Respiration Sensing via Commodity WiFi 6E Devices

Enabling Respiration Sensing via Commodity WiFi 6E Devices

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IEEE Conference on Global Communications (GLOBECOM)

作者： Xuanhong Liang Howard H. Yang Kun Guo Tony Q. S. Quek Zhejiang University/University of Illinois Urbana-Champaign Institute Zhejiang University Haining China National Mobile Communications Research Laboratory Southeast University Nanjing China School of Communications and Electronics Engineering East China Normal University Shanghai China Information System Design and Technology Pillar Singapore University of Technology and Design Singapore

ISBN: (数字)9798350351255

ISBN: (纸本)9798350351262

Along with the advancement of WiFi technologies, commodity devices of WiFi 6E have now prevailed. In this paper, we conduct a wireless sensing task that utilizes WiFi 6E devices to monitor the respiration pattern of a human being. We discover new features, as well as their causes, in the channel state information (CSI) measured from WiFi 6E devices, which significantly differ from those in legacy IEEE 802.11n/ac/ax devices. As a result, directly applying conventional sensing techniques based on the CSI hardly yields satisfactory performance. In response, we propose a new method that effectively rectifies the measurement defects and recovers the targeted signal. We carry out extensive experiments, the results of which show that our approach substantially outperforms state-of-the-art benchmarks in sensing accuracy, verifying the effectiveness of our scheme.

关键词： Wireless communication Performance evaluation Wireless sensor networks Histograms Sensors Global communication Phase locked loops Wireless fidelity Monitoring Channel state information

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Reflection-type surface lattice resonances in all-metal metasurfaces for refractive index sensing

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Photonics Research 2023年第12期11卷 2210-2221页

作者： LIYE LI YIFAN OUYANG LIJUN MA HONGSHUN SUN YUSA CHEN MEIZHANG WU ZHIMEI QI WENGANG WU National Key Laboratory of Science and Technology on Micro/Nano Fabrication School of Integrated CircuitsPeking UniversityBeijing 100871China School of Electronics Peking UniversityBeijing 100871China School of Automation University of Science and Technology BeijingBeijing 100083China School of Instrument Science and Opto-Electronics Engineering Beijing Information Science and Technology UniversityBeijing 100096China State Key Laboratory of Transducer Technology Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Beijing Advanced Innovation Center for Integrated Circuits Beijing 100871China Frontiers Science Center for Nano-optoelectronics Peking UniversityBeijing 100871China

Surface lattice resonance(SLR)is a pretty effective mechanism to realize ultranarrow linewidths in the ***,we propose and demonstrate reflection-type SLRs in all-metal metasurfaces experimentally,compared with the traditional transmission-type SLR,which can avoid the refractive index(RI)mismatch problem and are more suitable for high-efficiency RI sensing due to direct contact and strong light–matter *** measured SLR linewidth is 13.5 nm influenced by the meta-atom size,which needs a compromise design to keep a balance between the narrow linewidth and noise ***,the SLR sensitivity is determined by the lattice period along the polarization direction with regularity,which establishes an intuitive link between structures and optical responses and provides a theoretical guide for metasurface ***,incident angle multiplexing will make the resonance wavelength red shift or blue shift in the case of orthogonal *** rectangular array metasurface can realize dual SLRs with different sensing ***,the SLR can also be formed by the different meta-atoms and *** research supports SLR multifarious applications involving not only RI sensing but also nonlinear optics,nano-lasers,etc.

关键词： polarization lattice refractive

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A High-aspect-ratio Gold Nanoring Array Optical Resonator

A High-aspect-ratio Gold Nanoring Array Optical Resonator

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IEEE International Conference on Nano/Micro Engineered and Molecular systems (NEMS)

作者： Mengcheng Wang Dongyu Cui Zhijuan Su Faheng Zang Department of Micro/Nano Electronics School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai China Global Institute of Future Technology Shanghai Jiao Tong University Shanghai China National Key Laboratory of Advanced Micro and Nano Manufacture Technology Shanghai Jiao Tong University Shanghai China

ISBN: (数字)9798350359831

ISBN: (纸本)9798350359848

This paper reports a high-aspect-ratio gold nanoring array with tunable optical resonances for high light-absorption and large-area near-field enhancement. The effects of nanoring height and metal sidewall thickness on spectral characteristics is characterized using an FDTD solver. We demonstrate nanofabrication of such gold nanorings with heights of over 100 nanometers, breaking the limitations of conventional thin film nanofabrication processes in patterning high-aspect-ratio nanostructures. The proposed approach has demonstrated flexibility in tuning the optical resonance peaks through precise manipulation of thin-film metal parameters.

关键词： Gold Nanofabrication Optical resonators Optical reflection Optical films Time-domain analysis Tuning

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Anodic Overvoltage Electrolysis for Highly Efficient Sulfuric Acid Leaching of Nickel Pig Iron

SSRN

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SSRN 2024年

作者： Kwon, Namhun Kim, Myungsuk Bae, Seoung Uk Kim, Soosung Oh, Soong Ju Park, Kyoung-Tae Shin, Jae Hong Korea National Institute of Rare Metals Korea Institute of Industrial Technology Incheon21655 Korea Republic of Department of materials science and engineering Korea University Seoul02841 Korea Republic of Department of Materials Science and Chemical Engineering Hanyang University Ansan15588 Korea Republic of Department of Advanced Materials Engineering for Information & Electronics Kyung Hee University Yongin17104 Korea Republic of

The increasing demand for Ni, primarily fueled by the widespread use of secondary batteries, has emphasized the urgency of identifying new methods to ensure a stable supply. Therefore, numerous countries and institutions are actively involved in research aimed at refining Ni, with a focus on converting intermediate products, such as mixed hydroxide precipitate, nickel pig iron (NPI), and ferronickel, into high-purity nickel sulfate. Conventional atmospheric leaching processes have thermodynamic limitations, making Ni extraction from these intermediates impractical under standard conditions. The preferred approach is high-pressure acid leaching (HPAL), which is typically performed at elevated temperatures and pressures. However, HPAL is associated with significant environmental and economic concerns. Therefore, this study introduces an innovative method that uses NPI as the anode. Intentional induction of overpotential at the anode facilitates controlled oxidation while transforming it into finely divided oxide particles. This deliberate oxidation significantly increases the specific surface area, thereby improving the thermodynamic susceptibility of the oxides to H2SO4 dissolution. Consequently, the Ni leaching efficiency was significantly enhanced, achieving an impressive efficiency rate of up to 98%, without requiring additional additives. This study systematically investigated the optimization of the grinding and leaching efficiencies under various operating voltages. © 2024, The Authors. All rights reserved.

关键词： Electrolysis

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