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Dynamic reconstruction of Ni-Zn alloy solid-electrolyte interface for highly stable Zn anode

Nano Research 2023年第9期16卷 11604-11611页

作者： Qian Zhang Yuhang Dai Kangning Zhao Chengyi Zhang Ruihu Lu Jinghao Li Shuhan Jin Lei Zhang Qinyou An Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Physical Science and Technology School of ScienceWuhan University of TechnologyWuhan 430070China Hainan Institute Wuhan University of TechnologySanya 572000China

Aqueous zinc ion batteries(AZIBs)are ideal candidates for large-scale battery storage,with a high theoretical specific capacity,ecological friendliness,and extremely low cost but are strongly hindered by zinc dendrite ***,Ni-Zn alloy is artificially constructed as a solid-electrolyte interface(SEI)for Zn anodes by electrodeposition and *** Ni-Zn alloy layer acts as a dynamic shield at the electrode/electrolyte ***,the zinc atoms migrate out of the electrode body during zinc stripping while merging into the electrode body during the *** this way,the Ni-Zn alloy is able to guide the zinc deposition in the horizontal direction,thereby suppressing the formation of *** from those,the Ni-Zn alloy symmetric cell shows a greatly improved cycle life and is able to operate stably for 1,900 h at a current density of 0.5 mA·cm^(−2).The present study is a strategy for negative electrode protection of AZIBs.

关键词： zinc ion batteries Zn anodes Ni-Zn alloy migration mechanism

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High-Performance Data Loader for Large-Scale Data Processing

High-Performance Data Loader for Large-Scale Data Processing

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IS and T International Symposium on Electronic Imaging 2024: High Performance Computing for Imaging 2024

作者： Martinez-Noriega, Edgar Josafat Peng, Chen Yokota, Rio National Institute of Advanced Industrial Science and Technology Japan Tokyo Institute of Technology Japan

The utilization of supercomputers and large clusters for big-data processing has recently gained immense popularity, primarily due to the widespread adoption of Graphics Processing Units (GPUs) to execute iterative algorithms, such as Deep Learning and 2D/3D imaging applications. This trend is especially prominent in the context of large-scale datasets, which can range from hundreds of gigabytes to several terabytes in size. Similar to the field of Deep Learning, which deals with datasets of comparable or even greater sizes (e.g. LION-3B), these efforts encounter complex challenges related to data storage, retrieval, and efficient GPU utilization. In this work, we benchmarked a collection of high-performance general dataloaders used in Deep Learning with a dual focus on user-friendliness (Pythonic) and high-performance execution. These dataloaders have become crucial tools. Notably, advanced dataloading solutions such as Webdatasets, FFCV, and DALI have demonstrated significantly superior performance when compared to traditional PyTorch general data loaders. This work provides a comprehensive benchmarking analysis of high-performance general dataloaders tailored for handling extensive datasets within supercomputer environments. Our findings indicate that DALI surpasses our baseline PyTorch dataloader by up to 3.4x in loading times for datasets comprising one million images. © 2024, Society for Imaging science and technology.

关键词： Supercomputers

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Secure Block Chain-Based Healthcare Sensitive Data Prediction Using Pragmatic Quasi-Identifiers in a Decentralized Cloud Environment

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SN Computer science 2024年第1期5卷 41页

作者： Punithavathi, S. Jeyalaksshmi, S. Department of Computer Science Vels Institute of Science Technology and Advanced Studies Chennai India Hindustan College of Arts and Science Chennai India Department of Information Technology School of Computing Science Vels Institute of Science Technology and Advanced Studies Chennai India

Security is essential for all facts, information sharing around the internet and maintaining personalized information. In recent days, the healthcare industry needs privacy-preserving to keep personalized data from others containing sensitive information. Due to increasing security breaches, fundamental sharing problems with personalized details shared on the internet lead to security problems. To resolve this problem, we propose a Secure Blockchain-based Healthcare-sensitive data prediction using a Pragmatic quasi identifier in a decentralized cloud environment. Pragmatic quasi-sensitivity Identification (PQSI) based Privacy-preserving for securing personalized records Using Hyper Recurrent feature classification for improved cloud security. Initially, the sensitivity fitness value of the feature is estimated through Intensive feature success rate (IFSR) and clustered by marginal subset features. By marginalizing the sensitivity threshold frequency rate, the components are extracted by pragmatic quasi-sensitive identifier and classified using Hyper recurrent Neural classification (HRNC) to find the sensitive and non-sensitive records based on frequency fitness weight to split and store perception as individually in the private cloud. Further, to improve the security level Elliptic Curve Cryptography (ECC) based master node authentication technique is used in the blockchain concept. Peer end Block chain principle is applied to secure the sensitive data. To ensure the sensitive records are sanitized into data blocks to assure in a blockchain environment. This proposed system produces higher prediction accuracy than other methods and achieves higher sensitivity and specificity rate performance. © 2023, The Author(s), under exclusive licence to Springer Nature Singapore Pte Ltd.

关键词： Cloud computing ECC Hyper recurrent feature classification Privacy preservation Security Sensitive data analysis

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Stretchable,transparent and multifunctional PVC-gel heater:a novel approach to skin-mountable,wearable thermal devices

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npj Flexible Electronics 2024年第1期8卷 292-303页

作者： Minki Kim Minjae Cho Chongyoung Chung Ki-Uk Kyung Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon34141Republic of Korea

Electric heaters based on functional materials and innovative designs have been developed for various *** this paper,we propose a soft dielectric heater(SDH)using polyvinyl chloride-gel(PVCgel)as the dielectric heater and hydrogel as stretchable *** an AC voltage,the leakage current in the PVC-gel leads to continuous injection and discharge of charges,causing the polarized plasticizers and flexible PVC chains to vibrate and collide,thereby generating heat through dielectric ***,the SDH generates a uniform temperature distribution even under strains up to 400%.Besides,high transmittance over 86%across the visible range renders it suitable for wearable or skin-mountable heaters from an esthetic *** capacitor-like structure achieves a scalable design,enabling extension from a singular cell to a row/column addressable and pixelated array of *** 5×5 SDH array can deliver varied thermal information and sensations while maintaining performance even when stretched.

关键词： mount dielectric wear

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Fatigue Crack Initiation and Propagation Dominated by Crystallographic Factors in TiB/near α-Ti Composite

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Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 763-776页

作者： Fanchao Meng Rui Zhang Shuai Wang Fengbo Sun Run Chen Lujun Huang Lin Geng School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Waikato Centre for Advanced Materials and Manufacturing School of EngineeringUniversity of WaikatoHamilton 3240New Zealand State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

Discontinuously reinforced titanium matrix composites(DRTMCs)with a network structure have been extensively researched due to their superior combination of strength and ***,their fatigue performance has remained *** order to elucidate the fatigue behavior of DRTMCs,a tension-tension fatigue test was performed on a TiB/nearα-Ti composite with network *** results showed that the variability of fatigue lifetime increased as the stress level *** analysis indicated that fatigue crack initiation was associated with facet formation,while the subsequent propagation was hindered by the network structure comprising TiB whiskers and *** characterization further revealed that facets formed due to a combination of shear and normal *** reduction in fatigue lifetime was attributed to an increase in the effective slip length,which was influenced by the orientation of grains near the crack-initiation sites toward basal slip in the life-limiting *** in situ observation suggested that the crack initiation was facilitated by both basal and prismatic slip ofα-Ti as well as fracture of *** propagation was found to be associated with basal and prismatic slip systems with high Schmid factors,regardless of whether the crack was intergranular or intragranular.

关键词： Titanium matrix composite TiBw Fatigue lifetime variability Crack initiation Crack propagation

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Hot deformation behavior and microstructure evolution of GH3536-TiB_(2) composites fabricated by powder metallurgy

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science China(Technological sciences) 2024年第7期67卷 2107-2124页

作者： ZHOU ShiPeng WANG Shuai HUANG LuJun ZHANG Rui CHEN Xin MENG FanChao CHEN Run SUN FengBo WANG CunYu GENG Lin School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Waikato Centre for Advanced Materials and Manufacturing School of EngineeringUniversity of WaikatoHamilton 3240New Zealand State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

The hot deformation behavior and microstructure evolution of GH3536-TiB2composites fabricated by powder metallurgy(PM)were examined in the temperature range of 950–1150℃ and strain rate range of 0.001–1 s^(-1). The hot compression stress-strain curves and the constitutive equation were obtained. In addition, the hot processing map was drawn, which indicated that the appropriate hot working window was 950–1050℃/0.001–0.1 s^(-1)and 1050–1100℃/0.001–0.01 s^(-1). The microstructure analysis showed that the splitting and spheroidization of M3B2led to a decrease in size and volume fraction at 950–1100℃. At 1150℃,the eutectic microstructure of M_(3)B_(2)+ γ was formed due to the dissolution of M_(3)B_(2), which caused macroscopic cracking of the deformed sample. Additionally, the deformation temperature and the strain rate had little effect on the size and volume fraction of M_(3)B_(2). Besides, discontinuous dynamic recrystallization(DDRX) and continuous dynamic recrystallization(CDRX) were found in the deformed microstructure, while the former was dominant. Within the test range of this work, the dynamic recrystallization(DRX) fraction of the deformed composites was high due to the bulging nucleation of numerous interfaces. The DRX grain size increased with increasing deformation temperature or decreasing strain rate. Texture analysis showed that the deformation texture of <101>//compression direction RD existed in the matrix when the deformation temperature was below 1100℃, and the texture type became <001>//RD at 1100℃. Additionally, it was also found that the <001>//RD texture was formed in M3B2under the strain rates of 0.1 and 0.01 s^(-1).

关键词： GH3536 alloy matrix composites powder metallurgy hot deformation behavior microstructure evolution

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An Ultra-Low-Profile Dual-Wideband Antenna Based on Multiple Modes and Multiple coupling for 5G terminal Application

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IEEE Antennas and Wireless Propagation Letters 2025年第6期24卷 1432-1436页

作者： Yang, Xu Geng, Xin Shen, Miao-Peng Yang, Wen-Wen Kong, Wei-Bin Qin, Wei Chen, Jian-Xin Yancheng Institute of Technology China Nantong University School of Information Science and Technology China Nantong Research Institute for Advanced Communication Technologies Chongchuan Nantong226019 China

An ultra-low-profile dual-band antenna based on half-mode substrate integrated waveguide (HMSIW) and shorted patches for 5G mobile terminal applications is proposed in this letter. The antenna has a height of only 0.5mm (0.006λL) and occupies a footprint of 38.5 mm × 40 mm (0.43λL × 0.45λL). First, three modes are obtained by exciting the HMSIW antenna loaded with cross slots, specifically the TE110 mode at 3.5 GHz and the even/odd TE210 modes around 4.9 GHz, enabling dual-band operation. Next, by parasitizing two shorted patches on the left side and one on the bottom of the HMSIW, two modes at 3.5 GHz and one mode at 4.9 GHz are introduced. Based on this structure, three operating modes can be obtained respectively at 3.5 GHz and 4.9 GHz band, effectively overcoming the bandwidth limitations caused by the extremely low profile. Measured results show that the bandwidth of the antenna can cover partial N78 band from 3.4 to 3.6 GHz and partial N79 band from 4.7 to 5 GHz. The average efficiencies are -2.45 dB in the N78 band and -2.94 dB in the N79 band. This design provides a promising solution for ultra-low-profile dual-wideband mobile terminal antennas. © 2002-2011 IEEE.

关键词： Microwave antennas

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A 7-13-GHz Broadband High-Efficiency MMIC Power Amplifier Using Second Harmonic Inductively Tuning Network

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IEEE Microwave and Wireless technology Letters 2025年第4期35卷 484-487页

作者： Wang, Xiangdong Li, Mo Wang, Qiyu Luo, Liwei Liu, Yang Zhang, Jian University of Electronic Science and Technology of China School of Electronic Science and Engineering Institute of Advanced Millimeter-Wave Technology Chengdu611731 China Sichuan Yifeng Electronic Science and Technology Company Ltd. Chengdu610073 China

This letter presents a three-stage 7-13-GHz broadband high-efficiency monolithic microwave integrated circuit (MMIC) power amplifier (PA) implemented in a commercial 0.25-μm GaAs pHEMT process. A novel second harmonic tuning method based on the RC model of the transistor is proposed for the efficiency maximization in a broadband range. In the output matching network (MNO), an inductive tuning network (ITN) is adopted to resonate with the parasitic capacitance seen from the intrinsic drain plane. With this method, the second harmonic is effectively tuned to an open-circuit state, which minimizes the overlaps of the drain current and voltage waveforms, thus greatly improving the efficiency. To achieve a broadband performance, a low-pass matching structure (LPMS) is employed to shift the matching trajectory of the fundamental impedance to nearby 50Ω by compensating the reactance of the fundamental impedance with negligible effect on the tuning of the second harmonic. Over the frequency range of 7-13 GHz, the MMIC PA delivers a saturated output power (PSAT) of 35.0-36.5 dBm with a power-added efficiency (PAE) of 42%-47.4% in the continuous wave (CW) mode and a PSAT of 35.5-36.9 dBm with a PAE of 43.8%-49.6% in the pulse mode. © 2023 IEEE.

关键词： Broadband amplifiers

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Controllable photooxidation of 1-phenylethanol integrated with hydrogen evolution by a polyoxometalate/ZnIn_(2)S_(4)/WO_(3)catalytic system

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Nano Research 2025年第4期18卷 116-124页

作者： Jiaxin Yang Yongkang Liu Yun Qin Zhenheng Diao Yuanyuan Dong Hongjin Lv School of Chemical Engineering Advanced Institute of Materials ScienceChangchun University of TechnologyChangchun 130012China MOE Key Laboratory of Cluster Science Beijing Key Laboratory of Photoelectric/Electrophotonic Conversion MaterialsSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 102488China

The photocatalytic oxidation of 1-phenylethanol coupling with hydrogen evolution represents a promising strategy for the full utilization of the photogenerated electrons and holes to accomplish the maximum conversion of solar energy into chemical *** date,however,the controllable of reaction path and product distribution has yet not to be ***,we report an efficient coupled catalytic system composed of ZnIn_(2)S_(4)/WO_(3)S-scheme heterojunction and Ni-containing polyoxometalate([Ni_(4)(H_(2)O)_(2)(PW_(9)O_(34))_(2)]^(10-)(Ni_(4)P_(2))),which exhibited excellent photocatalytic activities towards the oxidation valorization of 1-phenylethanol coupling with hydrogen *** addition of Ni_(4)P_(2)can efficiently control the product ***,1-phenylethanol was preferentially converted to pinacol(86.0% selectivity)via C-C coupling over ZnIn_(2)S_(4)/WO_(3)S-scheme heterojunction accompanied by hydrogen production(202.4μmol),whereas it would be converted to acetophenone(93.8% selectivity)by photogenerated holes with concomitant hydrogen formation(183.1μmol)over the coupled Ni_(4)P_(2)/ZnIn_(2)S_(4)/WO_(3) catalytic *** studies revealed that the hydrogen evolution cocatalyst Ni4P2,with its excellent electron storage capacity,can compete with the oxidation product acetophenone for electrons,and thus its addition can significantly inhibit the reduction of acetophenone,resulting in the inability to generate the coupling product pinacol.

关键词： S-scheme heterojunction ZnIn_(2)S_(4) polyoxometalates dehydrocoupling hydrogen evolution photocatalysis

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PVA-regulated construction of 3D rGO-hosted Na_(3)V_(2)(PO_(4))_(2)F_(3) for fast and stable sodium storage

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Journal of Energy Chemistry 2024年第12期99卷 100-109页

作者： Shilong Xu Ying Zhu Xinyan Li Yamei Wang Dong Yan Xiaobin Niu Jingxia Jiang Rui Wu Jun Song Chen School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina Medical and Pharmaceutical College Chongqing 401331China Institute for Advanced Study Chengdu UniversityChengdu 610054SichuanChina Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen 518000GuangdongChin

Na_(3)V_(2)(PO_(4))_(2)F_(3)(NVPF) is shown to be an attractive cathode material for sodium storage due to its high theoretical capacity and suitable working ***,its low electronic conductivity and poor cycling stability have to be addressed in order for enhanced high-rate performance and cycle ***,we have prepared a 3D reduced graphene oxide (rGO) host-supported NVPF *** discover that polyvinyl alcohol (PVA) serves as an important structural directing agent that bridges between NVPF and rGO through the hydrogen bonding,and thus regulates the formation of the 3D r GO framework with NVPF nanocuboids embedded inside (NVPF@C@rGO).With such a unique construction,NVPF@C@rGO exhibits excellent cycling stability and rate performance for sodium storage,showing high reversible capacities of 121 m Ah/g and 113 mAh/g at 1C and 10C,respectively,and 103 mAh/g after 700cycles at 50C with 98.3%*** at an extremely high current of 100C,it also delivers a reversible capacity of 64 mAh/g,surpassing the performance of many recently reported NVPF-based *** voltammetry (CV) and galvanostatic intermittent titration technique (GITT) data confirm the much better kinetic properties of NVPF@C@rGO electrode than the control samples of NVPF@rGO and pure ***-situ XRD results reveal that the 3D rGO housing can effectively suppress the lattice variation of NVPF,with a maximum volume change of only 1.84%during ***,the in-situ temperature sensing reveals the more stable working temperature of NVPF@C@rGO compared to phase-pure NVPF,suggesting a higher temperature safety of the *** NVPF@C@rGO as the positive electrode and commercial hard carbon as the negative electrode,a sodium-ion full battery has been assembled with about 110 m Ah/g at 1C for 300 cycles,corresponding to an energy density of 291 Wh kg^(-1).The construction of 3D r GO housing as a conductive support offers an effective strategy for high-rate,long cyc

关键词： Sodium-ion battery Polyanionic compound Reduced graphene oxide 3D carbon layers Na_(3)V_(2)(PO_(4))_(2)F_(3)

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