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Wafer‑Scale Ag_(2)S‑Based Memristive Crossbar Arrays with Ultra‑Low Switching‑Energies Reaching Biological Synapses

Nano-Micro Letters 2025年第3期17卷 328-339页

作者： Yuan Zhu Tomas Nyberg Leif Nyholm Daniel Primetzhofer Xun Shi Zhen Zhang Division of Solid‑State electronics Department of Electrical EngineeringUppsala University75121 UppsalaSweden department of Chemistry Uppsala UniversityUppsalaSweden department of Physics and Astronomy Uppsala UniversityUppsalaSweden State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050People’s Republic of China

Memristive crossbar arrays(MCAs)offer parallel data storage and processing for energy-efficient neuromorphic ***,most wafer-scale MCAs that are compatible with complementary metal-oxide-semiconductor(CMOS)technology still suffer from substantially larger energy consumption than biological synapses,due to the slow kinetics of forming conductive paths inside the memristive *** we report wafer-scale Ag_(2)S-based MCAs realized using CMOS-compatible processes at temperatures below 160℃.Ag_(2)S electrolytes supply highly mobile Ag+ions,and provide the Ag/Ag_(2)S interface with low silver nucleation barrier to form silver filaments at low energy *** further enhancing Ag+migration in Ag_(2)S electrolytes via microstructure modulation,the integrated memristors exhibit a record low threshold of approximately−0.1 V,and demonstrate ultra-low switching-energies reaching femtojoule values as observed in biological *** low-temperature process also enables MCA integration on polyimide substrates for applications in flexible ***,the intrinsic nonidealities of the memristive units for deep learning can be compensated by employing an advanced training *** impressive accuracy of 92.6%in image recognition simulations is demonstrated with the MCAs after the *** demonstrated MCAs provide a promising device option for neuromorphic computing with ultra-high energy-efficiency.

关键词： Wafer-scale Ag_(2)S films Reactive sputter Silver nucleation Ag^(+)migration Energy-efficient neuromorphic computing

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Flexible Strain Sensors with Ultra‑High Sensitivity and Wide Range Enabled by Crack‑Modulated electrical Pathways

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Nano-Micro Letters 2025年第3期17卷 246-264页

作者： Yunzhao Bai Yunlei Zhou Xuanyu Wu Mengfei Yin Liting Yin Shiyuan Qu Fan Zhang Kan Li YongAn Huang State Key Laboratory of Intelligent Manufacturing Equipment and technology Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China Flexible electronics Research Center Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China Hangzhou Institute of technology Xidian UniversityHangzhou 311200People’s Republic of China School of Mechano‑Electronic engineering Xidian UniversityXi’an 710071People’s Republic of China department of Aerospace and Mechanical engineering University of Southern CaliforniaLos AngelesCA 90089USA

This study presents a breakthrough in flexible strain sensor technology with the development of an ultrahigh sensitivity and wide-range sensor,addressing the critical challenge of reconciling sensitivity with measurement *** by the structure of bamboo slips,we introduce a novel approach that utilises liquid metal to modulate the electrical pathways within a cracked platinum fabric *** resulting sensor demonstrates a gauge factor greater than 108 and a strain measurement capability exceeding 100%.The integration of patterned liquid metal enables customisable tuning of the sensor’s response,while the porous fabric structure ensures superior comfort and air permeability for the *** design not only optimises the sensor’s performance but also enhances the electrical stability that is essential for practical *** systematic investigation,we reveal the intrinsic mechanisms governing the sensor’s response,offering valuable insights for the design of wearable strain *** sensor’s exceptional performance across a spectrum of applications,from micro-strain to large-strain detection,highlights its potential for a wide range of real-world uses,demonstrating a significant advancement in the field of flexible electronics.

关键词： Flexible strain sensor Fabric Crack Response regulation Epidermal device

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IMPROVED TABU SEARCH RECURSIVE FUZZY METHOD FOR CRUDE OIL INDUSTRY

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International Journal of Modeling, Simulation, and Scientific Computing 2012年第1期3卷 31-50页

作者： P.VASANT T.GANESAN I.ELAMVAZUTHI Fundamental and Applied Sciences department university technology petronas 31750 TronohMalaysia Mechanical engineering department university technology petronas 31750 TronohMalaysia electrical and electronics engineering department university technology petronas 31750 TronohMalaysia

The minimization of the profit function with respect to the decision variables is very important for the decision makers in the oil field *** this paper,a novel approach of the improved tabu search algorithm has been employed to solve a large scale problem in the crude oil refinery *** problem involves 44 variables,36 constraints,and four decision variables which represent four types of crude oil *** decision variables have been modeled in the form of fuzzy linear programming *** vagueness factor in the decision variables is captured by the nonlinear modified S-curve membership function.A recursive improved tabu search has been used to solve this fuzzy optimization *** improved results are obtained for the optimal profit function and optimal solution for four crude *** accuracy of constraints satisfaction and the quality of the solutions are achieved successfully.

关键词： Crude oil membership function improved tabu search recursive technique level of satisfaction

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Analysis of highly efficient perovskite solar cells with inorganic hole transport material

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Chinese Physics B 2019年第12期28卷 393-399页

作者： I Kabir S A Mahmood department of electrical and electronics engineering Bangladesh University of Engineering and Technology

Organo-halide perovskites in planar heterojunction architecture have shown considerable promise as efficient light harvesters in solar cells. We carry out a numerical modeling of a planar lead based perovskite solar cell(PSC) with Cu2ZnSnS4(CZTS) as the hole transporting material(HTM) using the one-dimensional solar cell capacitance simulator(SCAPS-1 D). The effects of numerous parameters such as defect density, thickness, and doping density of the absorber layer on the device performance are investigated. The doping densities and electron affinities of the electron transporting material(ETM) and the HTM are also varied to optimize the PSC performance. It has been observed that a thinner absorber layer of220 nm with a defect density of 1014 cm-3 compared to the reference structure improves the device performance. When doping density of the absorber layer increases beyond 2×1016 cm-3, the power conversion efficiency(PCE) reduces due to enhanced recombination rate. The defect density at the absorber/ETM interface reduces the PCE as well. Considering a series resistance of 5 ?·cm2 and all the optimum parameters of absorber, ETM and HTM layers simultaneously, the overall PCE of the device increases significantly. In comparison with the reference structure, the PCE of the optimized device has been increased from 12.76% to 22.7%, and hence the optimized CZTS based PSC is highly efficient.

关键词： CH3NH3PbI3 Cu2ZnSnS4(CZTS) SCAPS-1D absorption coefficient

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Study on eigenvalue space of hyperchaotic canonical four-dimensional Chua's circuit

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Chinese Physics B 2010年第3期19卷 137-144页

作者：李冠林陈希有 department of electrical and electronics engineering Dalian University of Technology

The eigenvalue space of the canonical four-dimensional Chua＇s circuit which can realize every eigenvalue for fourdimensional system is studied in this paper. First, the analytical relations between the circuit parameters and the eigenvalues of the system are established, and therefore all the circuit parameters can be determined explicitly by any given set of eigenvalues. Then, the eigenvalue space of the circuit is investigated in two cases by the nonlinear elements used. According to the types of the eigenvalues, some novel hyperchaotic attractors are presented. Further, the dynamic behaviours of the circuit are studied by the bifurcation diagrams and the Lyapunov spectra of the eigenvalues.

关键词： four-dimensional Chua's circuit eigenvalue space hyperchaos

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Signal Detection of Carbon in Iron-Based Alloy by Double-Pulse Laser-Induced Breakdown Spectroscopy

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Plasma Science and technology 2015年第11期17卷 953-957页

作者：林晓梅李晗姚清华 department of electronics and electrical engineering Changchun University of Technology

Although single-pulse lasers are often used in traditional laser-induced breakdown spectroscopy （LIBS） measurements, their measurement outcomes are generally undesirable because of the low sensitivity of carbon in iron-based alloys. In this article, a double-pulse laser was applied to improve the signal intensity of carbon. Both the inter-pulse delay and the combination of laser wavelengths in double-pulse laser-induced breakdown spectroscopy （DP-LIBS） were optimized in our experiment. At the optimized inter-pulse delay, the combination of a first laser of 532 nm and a second laser of 1,064 nm achieved the highest signal enhancement. The properties of the target also played a role in determining the mass ablation enhancement in DP-LIBS configuration.

关键词： DP-LIBS carbon signal detection iron-based alloy

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Image Tamper Detection and Multi-Scale Self-Recovery Using Reference Embedding with Multi-Rate Data Protection

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China Communications 2019年第11期16卷 154-166页

作者： Navid Daneshmandpour Habibollah Danyali Mohammad Sadegh Helfroush department of electrical and electronics engineering Shiraz University of Technology

This paper proposes a multi-scale self-recovery(MSSR)approach to protect images against content *** main idea is to provide more resistance against image tampering while enabling the recovery process in a multi-scale quality *** the proposed approach,the reference data composed of several parts and each part is protected by a channel coding rate according to its *** first part,which is used to reconstruct a rough approximation of the original image,is highly protected in order to resist against higher tampering *** parts are protected with lower rates according to their importance leading to lower tolerable tampering rate(TTR),but the higher quality of the recovered *** proposed MSSR approach is an efficient solution for the main disadvantage of the current methods,which either recover a tampered image in low tampering rates or fails when tampering rate is above the TTR *** simulation results on 10000 test images represent the efficiency of the multi-scale self-recovery feature of the proposed approach in comparison with the existing methods.

关键词： tamper detection image recovery multi-scale self-recovery tolerable tampering rate

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Delta-doped quantum wire tunnel junction for highly concentrated solar cells

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Chinese Physics B 2019年第4期28卷 275-279页

作者： Ali Bahrami Mahyar Dehdast Shahram Mohammadnejad Habib Badri Ghavifekr Optoelectronics and Nanophotonics Research Laboratory (ONRL) Electrical and Electronics Engineering DepartmentSahand University of Technology Nanoptronics Research Center Electrical and Electronics Engineering DepartmentIran University of Science and Technology Microelectronics Research Laboratory Department of Electrical Engineering Sahand University of Technology

We propose a novel structure for tunnel junction based on delta-doped AlGaAs/GaAs quantum wires. Higher spatial confinement of quantum wires alongside the increased effective doping concentration in the delta-doped regions extremely increase the peak tunneling current and enhance the performance of tunnel junction. The proposed structure can be used as tunnel junction in the multijunction solar cells under the highest possible thermodynamically limited solar *** combination of the quantum wire with the delta-doped structure can be of benefit to the solar cells' advantages including higher number of sub-bands and high degeneracy. Simulation results show a voltage drop of 40 mV due to the proposed tunnel junction used in a multijunction solar cell which presents an extremely low resistance to the achieved peak tunneling current.

关键词： delta-doping quantum wire solar cell tunnel junction

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Enhanced frameless slotted ALOHA protocol with Markov chains analysis

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Science China(Information Sciences) 2018年第10期61卷 187-197页

作者： Dai JIA Zesong FEI Ming XIAO Congzhe CAO Jingming KUANG School of Information and electronics Beijing Institute of Technology School of electrical engineering Royal Institute of Technology department of electrical and Computer engineering University of Alberta

In this paper, we propose a novel approach to enhance the performance of frameless slotted ALOHA(SA) protocol. We employ signature codes to help the receiver identify the packets contained in collisions, and use successive interference cancellation(SIC) for packet recovery. We model the proposed scheme as a two-state Markov model represented by a uni-partite graph. We evaluate the throughput,expected delay and average memory size of the proposed scheme, and optimize the proposed scheme to maximize the throughput. We show that the theoretical analysis matches well with simulation *** throughput and expected delay of the proposed protocol outperform the conventional slotted ALOHA protocol significantly.

关键词： slotted ALOHA SIC Markov chain uni-partite graph throughput delay

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Outage Analysis of Opportunistic Cooperative Ad Hoc Networks with Randomly Located Nodes

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Journal of Computer Science & technology 2013年第3期28卷 403-411页

作者：邢成文丁海川杨光华马少丹费泽松 School of Information and electronics Beijing Institute of Technology department of electrical and Computer engineering University of Macao department of electrical and Electronic engineering The University of Hong Kong

In this paper, an opportunistic cooperative ad hoc sensor network with randomly located nodes is analyzed. The randomness of nodes＇ locations is captured by a homogeneous Poisson point process. The effect of imperfect interference cancellation is also taken into account in the analysis. Based on the theory of stochastic geometry, outage probability and cooperative gain are derived. It is demonstrated that explicit performance gain can be achieved through cooperation. The analyses are corroborated by extensive simulation results and the analytical results can thus serve as a guideline for wireless sensor network design.

关键词： ad hoc network selection cooperation point process

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