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A Secure Storage and Verification Framework Based on Consortium Blockchain for Engineering Education Accreditation Data

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Computers, Materials and Continua 2025年第3期83卷 5323-5343页

作者： Luo, Yuling Lin, Xiaoguang Liu, Junxiu Fu, Qiang Qin, Sheng Min, Zhen Hu, Tinghua Guangxi Key Laboratory of Brain-Inspired Computing and Intelligent Chips School of Electronic and Information Engineering Guangxi Normal University Guilin541004 China Key Laboratory of Nonlinear Circuits and Optical Communications Guangxi Normal University Education Department of Guangxi Zhuang Autonomous Region Guilin541004 China

The majors accredited by the Engineering Education Accreditation (EEA) reflect the accreditation agency’s recognition of the school’s engineering programs. Excellent accreditation management holds significant importance for the advancement of engineering education programs. However, the traditional engineering education system framework suffers from the opacity of raw education data and the difficulty for accreditation bodies to forensically examine the self-assessment reports. To solve these issues, an EEA framework based on Hyperledger Fabric blockchain technology is proposed in this work. Firstly, all relevant stakeholders and information interactions occur within the blockchain network, ensuring the authenticity of educational data and enhancing the transparency of accreditation processes. Secondly, multiple roles are abstracted into a single organization to optimize the network topology. The original data is stored off-chain, and the hash values of the data are stored on-chain to reduce on-chain storage costs. The experimental results show that the proposed framework has a high throughput and the network latency of writing data to the blockchain is reduced by at least 0.04 s. It effectively improves network performance and security, which provides new insights for EEA management. Copyright © 2025 The Authors.

关键词： Engineering education

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Transition metal embedded in nonmetal-doped T-carbon : A superior synergistic trifunctional electrocatalyst for HER, OER and ORR

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Journal of Energy Chemistry 2023年第8期83卷 79-89,I0004页

作者： Zhengqin Zhao Jinbo Hao Baonan Jia Xinhui Zhang Ge Wu Chunling Zhang Long Li Shuli Gao Yirong Ma Yuanzi Li Pengfei Lu School of Science Xian University of Architecture and TechnologyXi'an 710055ShaanxiChina State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China School of Integrated Circuits Beijing University of Posts and TelecommunicationsBeijing 100876China

The design of efficient and low-cost multifunctional electrocatalysts for hydrogen evolution reaction(HER), oxygen evolution reaction(OER) and oxygen reduction reaction(ORR) is critical for the development of clean energy. Two-dimensional(2D) carbon-based nano-materials are becoming more and more popular in heterogeneous catalysis due to their cost-effective and multi-scale tunability as single-atom catalysis(SACs) substrates. In this paper, by using first-principles calculation, we designed and demonstrated a novel macropore T-carbon [110](TC) monolayer as 2D electrocatalyst substrate for HER/OER/ORR, and the synergistic modification of the transition metal and nonmetal atoms(TM-X) were investigated to enhance the multifunctional electrocatalytic performance. We screened out the Co embedded in N-doped TC(Co3@N-TC) from 30 TM@X-TC monolayers as a trifunctional electrocatalysts, which exhibits superior performance for HER/ORR/OER on both thermodynamic and kinetic scales, and with excellent thermal and electrochemical stability. Then, the TC monolayer is naturally macropore with a diameter of 5.36 A and exhibits excellent adsorption capacity for the intermediates and products of the redox reactions. Moreover, we revealed the origin of the electrocatalytic activity using the crystal orbital Hamilton population(COHP) and the molecular orbitals(MOs). The d orbital of Co3@N-TC is significantly hybridized with the p orbital of the intermediates, so that the lone electrons initially occupied in the antibonding state pair up and occupy the downward bonding state, allowing *OH to be appropriately adsorbed onto the TC monolayer. This work not only demonstrates that the TM@X-TC monolayer is a superior synergistic trifunctional electrocatalyst, but also reveals a macropore monolayer material with potential applications in electrocatalysis.

关键词： Carbon-based nano-materials Macropore Single-atom catalyst Multifunctional electrocatalyst First-principles calculation

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optical Phased Array Receiver Field of View Extension using Higher Order Spatial Modes

Optical Phased Array Receiver Field of View Extension using ...

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IEEE International Conference on Group IV Photonics

作者： Enge Zhang Lei Zhang State Key Laboratory of Information Photonics and Optical Communications and School of Integrated Circuits Beijing University of Posts and Telecommunications Beijing China

We experimentally demonstrate that using higher order spatial modes can effectively improve the field of view and receiving efficiency of an optical phased array receiver.

ISBN: (数字)9798331506186

ISBN: (纸本)9798331506193

We experimentally demonstrate that using higher order spatial modes can effectively improve the field of view and receiving efficiency of an optical phased array receiver.

关键词： Phased arrays Laser radar optical design Particle separators optical device fabrication Systems architecture Silicon photonics optical receivers optical arrays

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Reviewing the impact of halides on electrochemical CO_(2) reduction

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Nano Research Energy 2023年第1期2卷 58-70页

作者： Zebi Zhao Jiguang Zhang Ming Lei Yanwei Lum State Key Laboratory of Information Photonics and Optical Communications&School of Integrated Circuits Beijing University of Posts and TelecommunicationsBeijing 100876China Institute of Materials Research and Engineering Agency for ScienceTechnology and Research(A*STAR)2 Fusionopolis wayInnovisSingapore 138634Singapore

Electrochemical CO_(2) reduction reaction(CO_(2)RR)is a promising technology for mitigating global warming and storing renewable *** low-cost and efficient electrocatalysts with high selectivity is a priority to facilitate CO_(2) *** ion(F^(-),Cl^(-),Br^(-),I^(-))modified electrocatalysts is a potential strategy to promote CO_(2) reduction and suppress the competitive hydrogen evolution reaction(HER).Therefore,a comprehensive review of the role and mechanism of halide ions in the CO_(2)RR process can help better guide the future design of efficient *** this review,we first discuss the role of halide ions on the structure and morphology of ***,the relationship between the halide ions and the valence states of the active sites on the catalyst surface is further elaborated ***,the mechanisms of halide in enhancing CO_(2) conversion efficiency are also summarized,including the involvement of halide ions in electron transfer and their influence on the reaction ***,we conclude with a summary and future outlook.

关键词： energy conversion CO_(2)reduction reaction electrocatalysts halide ions catalytic mechanism

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Photothermal nonlinear scattering of shell-isolated gold nanoparticles and applications in super-resolution imaging

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Chinese Optics Letters 2023年第10期21卷 119-124页

作者：张天悦王知远钟祥超车颖李向平 Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 510632China School of Integrated Circuits Beijing University of Posts and TelecommunicationsBeijing 100876China

In this Letter,we report on the investigations of nonlinear scattering of plasmonic nanoparticles by manipulating ambient *** create different local thermal hosts for gold nanospheres that are immersed in oil,encapsulated in silica glass and also coated with silica *** terms of regulable effective thermal conductivity,silica coatings are found to contribute significantly to scattering *** from the enhanced thermal stability and the reduced plasmonic coupling provided by the shell-isolated nanoparticles,we achieve super-resolution imaging with a feature size of 52 nm(λ/10),and we can readily resolve pairs of nanoparticles with a gap-to-gap distance of 5 nm.

关键词： noble metal nanoparticles plasmonic scattering effective thermal conductivity super-resolution

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Theoretical Calibration of Phase Errors in optical Phased Arrays

Theoretical Calibration of Phase Errors in Optical Phased Ar...

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IEEE International Conference on Group IV Photonics

作者： Enge Zhang Yichen Zhang Lei Zhang School of Integrated Circuits and State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China School of Electronic Engineering and State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China

This paper presents, for the first time, a comprehensive theory-based calibration method for the phase error of the optical phased array (OPA) LiDAR, which is experimentally validated using a 16-channel OPA chip.

ISBN: (数字)9798331506186

ISBN: (纸本)9798331506193

关键词： Phased arrays Laser radar Antenna theory Silicon photonics Adaptive optics Calibration Power generation optical arrays

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Four-channel Wavelength Selective Switch Based on Vernier Second-order Microring Resonators with Asymmetric Coupling Regions

Four-channel Wavelength Selective Switch Based on Vernier Se...

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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Song, Tao Zhang, Lei Yang, Xu Beijing University of Posts and Telecommunications State Key Laboratory of Information Photonics and Optical Communications Beijing China Beijing University of Posts and Telecommunications School of Integrated Circuits Beijing China The 54th Research Institute of China Electronic Technology Group Corporation Shijiazhuang China

ISBN: (纸本)9798350375909

We propose and demonstrate a 4-channel wavelength selective switch based on four 2nd-order microring resonators (MRRs) on silicon-on-insulator substrate. Two ring cavities with different perimeters in each 2nd-order MRR are controlled independently by two thermal heaters. The fabricated MRR shows a free spectral region of 27.5 nm and a 3 dB bandwidth of 132 GHz. The extinction ratios are 16 dB and 20 dB at the through and drop ports, respectively. Through the asymmetric coupling design in the MRR, the group delay difference between its two output ports is 2.78 ps. © 2024 IEEE.

关键词： Group delay

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Optimization of multi-stage avalanche photodiode structure based on InGaAs/InAlAs 6

Optimization of multi-stage avalanche photodiode structure b...

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6th Conference on Frontiers in optical Imaging and Technology: Novel Detector Technologies

作者： Du, Meiqin Han, Lihong Guan, Xiaoning Sun, Tong Liu, Gang Zhou, Feng Lu, Pengfei State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing100876 China School of Integrated Circuits Beijing University of Posts and Telecommunications Beijing100876 China

ISBN: (数字)9781510679696

ISBN: (纸本)9781510679689

Avalanche photodiodes (APD) can amplify the photoelectric signal based on the avalanche multiplication effect of carrier to improve the sensitivity of detection. They have the characteristics of low noise and high gain, so they are suitable for long-distance optical communication. In this work, a multi-stage avalanche photodiode structure with SAGCM (Separated Absorption, Grading, Charge and Multiplication region) is proposed based on Impact Ionization Engineering (I2E). The photocurrent, dark current, electric field, gain and noise characteristics of InGaAs/InAlAs avalanche photodiodes are studied by optimizing the thickness and doping concentration of the grading layer. According to the final simulation results, the optimized avalanche photodiodes has low excess noise. At 60 V voltage and 300 K temperature, the noise factor (F) of the five-stage APD is 6.94, and the gain can reach 430. © 2024 SPIE.

关键词： Avalanche photodiodes

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Stochastic Parallel Gradient Descent (SPGD) with Adaptive Parameter Tuning for optical Phased Array Calibration

Stochastic Parallel Gradient Descent (SPGD) with Adaptive Pa...

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OptoElectronics and communications Conference, OECC

作者： Enge Zhang Lei Zhang School of Integrated Circuits and State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications (BUPT) Beijing China

ISBN: (数字)9798350308396

ISBN: (纸本)9798350308402

We propose a modified stochastic parallel gradient descent (SPGD) algorithm with adaptive parameter tuning for optical phased array (OPA) calibration. Compared to the traditional SPGD algorithm, our method can adaptively adjust the parameters to jump out of the local optimum. We verify its feasibility by calibrating a 32-channel silicon OPA with non-uniform one-dimensional end-firing antennas. The side lobe level (SLL) of the OPA is reduced from around –2dB to below –10dB after the calibration with the proposed algorithm.

关键词： Phased arrays Adaptive arrays Adaptive optics Silicon Calibration Tuning Antennas optical arrays

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Highly stable chip-based variable optical attenuation for continuous-variable quantum key distribution 15

Highly stable chip-based variable optical attenuation for co...

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15th International Conference on Information Optics and Photonics, CIOP 2024

作者： Xu, Xuesong Bian, Yiming Li, Yang Zhang, Tao Pan, Yan Huang, Wei Yu, Song Zhang, Lei Zhang, Yichen Xu, Bingjie State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing100876 China National Key Laboratory of Security Communication Institute of Southwestern Communication Chengdu610041 China School of Integrated Circuits Beijing University of Posts and Telecommunications Beijing100876 China

ISBN: (数字)9781510686175

ISBN: (纸本)9781510686168

Conventional continuous-variable quantum key distribution systems typically rely on discrete optical components, which have limited integration, are bulky and expensive. To overcome these drawbacks, photonic integrated circuit technology is a viable alternative that promises to increase the system integration. However, variable optical attenuators compatible with established photonic integration processes have stability difficulties that limit the performance of the system. This work provides a chip-based variable optical attenuator based on Mach-Zehnder interferometer structure. By using an unbalanced interferometer arm, the sensitivity of the optical attenuation coefficient to environmental fluctuations can be reduced, ensuring the high-precision control required for continuous-variable quantum key distribution systems. Our scheme will facilitate the implementation of a reliable and highly stable chip-based continuous-variable quantum key distribution system. © 2024 SPIE.

关键词： Mach-Zehnder interferometers

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