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2023 4th International Conference on Electrical, Electronic Information and Communication Engineering, EEICE 2023

作者： Yang, Yuntao Peng, Bin Sun, Zhaofeng Huang, Fei Zhang, Wanli National Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu610054 China

In this work, a SAW pressure sensor based on a simply supported beam was designed and fabricated. The SAW resonator deposited on 128° YX-lithium niobate (LNO) substrate was used as the sensing element. The LNO substrate was used as a simply supported beam, therefore strain transfer loss was avoided and uniaxial stress was directly applied to the SAW resonator. An indenter with two ledges was used to indent the LNO beam and then uniform strain was applied to the SAW resonator. The sensitivity was experimentally measured in a pressure range of 330 kPa. The results demonstrated that the sensitivity of the SAW pressure sensor in this work was as high as 2514 ppm/MPa. The high pressure sensitivity of the proposed SAW pressure sensor was analyzed. The device structure of the proposed SAW pressure sensor may help to design highly sensitive SAW pressure sensors. © Published under licence by IOP Publishing Ltd.

关键词： Niobium compounds

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Diffractive interferogram-based phase control method of spatial light modulators

Diffractive interferogram-based phase control method of spat...

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2024 Conference on Spectral technology and Applications, CSTA 2024

作者： Jian, Haopeng Xue, Shuai Huang, Yihang Wang, Linfeng College of Intelligence Science and Technology National University of Defense Technology Hunan Changsha410073 China Laboratory of Science and Technology on Integrated Logistics Support National University of Defense Technology Hunan Changsha410073 China Hunan Key Laboratory of Ultra-Precision Machining Technology Hunan Changsha410073 China State Key of High Performance Complex Manufacturing Central South University Hunan Changsha410073 China

ISBN: (纸本)9781510683082

As an adaptive optics that can modulate phase of lights, spatial light modulators (SLMs) are widely used in laser shaping, telescopes, and surface figure interferometric tests. The phase control accuracy of SLMs affects the performance of these optical systems. However, the traditional birefringence effects-based phase control method has relatively low accuracy due to the non-linear phase response of SLMs. To this end, a diffractive interferogram-based phase control method is proposed. The general model for describe the diffraction-based phase control method is established. The phase control error model of the diffractive interferogram-based phase control method is analyzed theoretically. Theoretical analysis was conducted to analyze the phase quantization and discretization that influence the phase accuracy. By applying the discretized interference pattern with appropriate quantization level of a given phase and a standard reference phase into the SLM, phase control accuracy can be enhanced up to about λ/30 (λ=632.8 nm) root-mean-square. Comparisons of phase control accuracy of the proposed method with the traditional phase control method are conducted to verify the accuracy enhancement. Using the proposed method, the SLMs can be applied in systems with collimated or divergent beams configuration that requires high phase control accuracy such as interferometric surface figure tests. © 2024 SPIE.

关键词： Adaptive optics

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Efficient reduction and adsorption of Cr(Ⅵ)using FeCl_(3)-modified biochar:Synergistic roles of persistent free radicals and Fe(Ⅱ)

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Journal of Environmental sciences 2024年第3期137卷 626-638页

作者： Shujie Hu Chengshuai Liu Hongling Bu Manjia Chen Ying-heng Fei National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of ScienceGuiyang 550081China School of Environment Science and Engineering Guangzhou UniversityGuangzhou 510006China College of Resources and Environment Chongqing SchoolUniversity of Chinese Academy of SciencesChongqing 400714China School of Environmental Science and Engineering Guangdong University of TechnologyGuangzhou 510006China

Transition metal iron and persistent free radicals(PFRs)both affect the redox properties of biochar,but the electron transfer relationship between them and the coupling reduction mechanism of Cr(Ⅵ)requires further *** untangle the interplay between iron and PFRs in biochar and the infuences on redox properties,FeCl_(3)-modified rice husk biochar(FBCs)was prepared and its reduction mechanism for Cr(Ⅵ)without light was *** FBCs had higher surface positive charges,oxygen-containing functional groups,and PFRs compared with pristine rice husk biochar(BC).Phenoxyl PFRs with high electrondonating capability formed in *** pronounced electron paramagnetic resonance signals showed that the PFRs preferred to form at lower Fe(Ⅲ)*** a high concentration of Fe(Ⅲ)would be reduced to Fe(Ⅱ)and consumed the formed *** kinetics and X-ray photoelectron spectroscopy analysis indicated that the FBCs effectively enhanced the Cr(Ⅵ)removal efficiency by 1.54-8.20 fold and the Cr(Ⅵ)reduction efficiency by 1.88-9.29 fold compared to those of *** quenching and competitive reductant addition experiments revealed that the higher Cr(Ⅵ)reduction performance of FBCs was mainly attributed to the formed PFRs,which could contribute to~74.0%of Cr(Ⅵ)reduction by direct or indirect electron *** PFRs on FBCs surfaces could promote the Fe(Ⅲ)/Fe(Ⅱ)cycle through single electron transfer and synergistically accelerate~52.3%of Cr(Ⅵ)*** study provides an improved understanding of the reduction mechanism of iron-modified biochar PFRs on Cr(Ⅵ)in environments.

关键词： Biochar Iron-modification Cr(Ⅵ) Electron transfer Reduction mechanism

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A Simplified Prediction Method of Magnetic Field Radiation of High-power Power Electronic Equipment 10th

A Simplified Prediction Method of Magnetic Field Radiation o...

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10th Frontier Academic Forum of Electrical Engineering, FAFEE 2022

作者： Zhang, Lei Jie, GuiSheng Gao, Shan Ji, ShengXian National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Hubei Wuhan430033 China

ISBN: (纸本)9789819934072

In the integrated power system (IPS) of ship platform, the conducted interference generated by high-power power electronic equipment will not only spread along the wire on the power grid, but also radiate to the surrounding space through the cable. With the increasingly strict electromagnetic compatibility standards, the magnetic field radiation generated by the high-power power electronic equipment has also been strictly limited. Predicting it can more effectively design the interference suppression measures and improve the electromagnetic compatibility (EMC) performance of equipment. First a basic cable radiation model is established based on the electromagnetic field theory. Then, the conducted interference estimation of power electronic equipment has been briefly introduced. Finally, a simplified prediction method of magnetic field radiation of high-power power electronic equipment according to the calculation results of conducted interference and cable radiation model is proposed. The effectiveness of this method is verified by experiments. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Magnetic fields

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Towards V2I Age-Aware Fairness Access: A DQN Based Intelligent Vehicular Node Training and Test Method

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Chinese Journal of Electronics 2023年第6期32卷 1230-1244页

作者： WU Qiong SHI Shuai WAN Ziyang FAN Qiang FAN Pingyi ZHANG Cui School of Internet of Things Engineering Jiangnan University State Key Laboratory of Integrated Services Networks Xidian University Qualcomm Beijing National Research Center for Information Science and Technology Tsinghua University Banma Network Technology Co. Ltd.

Vehicles on the road exchange data with base station frequently through vehicle to infrastructure(V2I) communications to ensure the normal use of vehicular applications, where the IEEE 802.11 distributed coordination function is employed to allocate a minimum contention window(MCW) for channel access. Each vehicle may change its MCW to achieve more access opportunities at the expense of others, which results in unfair communication performance. Moreover, the key access parameter MCW is privacy information and each vehicle is not willing to share it with other vehicles. In this uncertain setting, age of information(Ao I), which measures the freshness of data and is closely related with fairness, has become an important communication *** this basis, we design an intelligent vehicular node to learn the dynamic environment and predict the optimal MCW, which can make the intelligent node achieve age fairness. In order to allocate the optimal MCW for the vehicular node, we employ a learning algorithm to make a desirable decision by learning from replay history data. In particular, the algorithm is proposed by extending the traditional deep-Q-learning(DQN) training and testing method. Finally, by comparing with other methods, it is proved that the proposed DQN method can significantly improve the age fairness of the intelligent node.

关键词： Training Privacy Heuristic algorithms Vehicle-to-infrastructure Roads Measurement uncertainty Prediction algorithms

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Adaptive wavefront interferometry for large surface figure error utilizing convolutional neural networks 7

Adaptive wavefront interferometry for large surface figure e...

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7th Global Intelligent Industry Conference, GIIC 2024

作者： Wang, Linfeng Xie, Zikang Mao, Yunfeng Liu, Junfeng Xue, Shuai Chen, Shanyong Dai, Yifan Liu, Yong College of Intelligence Science and Technology National University of Defense Technology Hunan Changsha410073 China Hunan Key Laboratory of Ultra-Precision Machining Technology Hunan Changsha410073 China Laboratory of Science and Technology on Integrated Logistics Support National University of Defense Technology Hunan Changsha410073 China State Key of High Performance Complex Manufacturing Central South University Hunan Changsha410073 China

ISBN: (纸本)9781510682986

In order to solve the problems of large surface figure errors in large value, high spatial frequency and multi-aberration modes which are beyond the dynamic range of the interferometer, and the problems of slow iterative convergence and high non-convergence rate of existing adaptive compensation optimization algorithm, an adaptive wavefront interferometry utilizing convolutional neural network(CNN) for large surface figure error is proposed, based on the existing adaptive compensation interference detection methods. This paper first introduces the aberration regulation principle of spatial light modulator (SLM), and sets up a convolutional neural network. Then, SLM is controlled to generate Zernike aberrations with different coefficients. Combined with Zygo Verifire interferometer, the corresponding far-field light intensity is collected to compose a labeled data set to train CNN. Finally, a large surface figure error coefficient prediction experiment is carried out with the trained CNN, and the aberration compensation is performed according to the prediction coefficient to verify the effectiveness of the method. The experimental results show that the dense fringes can be transformed into resolvable fringes with this method, and the resolvable probability of full-diameter fringes after compensation is 66.7%. This method is able to greatly improve the performance of adaptive compensation detection, thereby meeting the demand for high dynamic range interference detection technology in the ultra-precision optical surface manufacturing process. © 2024 SPIE.

关键词： Light modulation

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A Method for Detecting the Reducers' Grease Failure Based on Vibration Signal Analysis

A Method for Detecting the Reducers' Grease Failure Based on...

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2023 CAA Symposium on Fault Detection, Supervision and Safety for Technical Processes, SAFEPROCESS 2023

作者： Wang, Ditong Zhang, Hong Zheng, Ying Huazhong University of Science and Technology Belt and Road Joint Laboratory on Measurement and Control Technology Wuhan China Huazhong University of Science and Technology National Key Laboratory of Science and Technology on Multispectral Information Processing School of Artificial Intelligence and Automation Wuhan China

ISBN: (纸本)9798350337754

Real time detection of the lubricating grease's effectiveness is the best method to solve wear faults, which can achieve the purpose of predictive maintenance and improve the service life of mechanical equipment. A new online detection method for gearbox lubricating grease failure is proposed to address the issues about long offline detection cycles and high labor costs associated with phased sampling analysis. Compared with online detection methods such as inductive and photoelectric, our method is difficult to detect the specific physicochemical parameters of the grease. However, it has the advantage of simple operation without touching the grease or changing the structure of the tested object. It only needs to attach the vibration sensor table to the mechanical arm reducer to measure and analyze the vibration signal. This article briefly analyzes the impact of grease failure on vibration signals, and then we introduce a novel approach that uses support vector machines along with feature extraction through wavelet packet decomposition for our detection methodology. Next transfer the commonly used spectral image recognition algorithms for temporal signal classification to achieve failed grease detection as a baseline and compare with our traditional machine learning methods. The experimental findings indicate that the recognition accuracy of both methods are above 90%, with traditional machine learning performing better on this task. © 2023 IEEE.

关键词： Support vector machines

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Low-loss and broadband complementary dual-output electro-optic modulator based on thin-film lithium niobate

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Chinese Optics Letters 2024年第9期22卷 114-119页

作者： Tingan Li Chenglin Shang Xuanhao Wang Weiqiang Lü Zhiyao Zhang Cheng Zeng Yong Liu Jinsong Xia Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054China

Broadband,low-drive voltage electro-optic modulators are crucial optoelectronic components in the new-generation microwave photonic links and broadband optical interconnect network *** this paper,we fabricate a low-loss thinfilm lithium niobate complementary dual-output electro-optic modulator chip with a 3 dB electro-optic bandwidth of 59 GHz and a half-wave voltage(Vπ)of 2.5 *** insert-loss of the packaged modulator is 4.2 dB after coupling with polarizationmaintaining *** complementary dual-output modulator also shows a common-mode rejection ratio of 18 dB and a signal enhancement of 6.2 dB when adapted in microwave photonic links,comparable to commercial bulk lithium niobate devices.

关键词： thin-film lithium niobate electro-optic modulator microwave photonic links.

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Rubik’s cube as in-situ programmable matter and a reconfigurable mechanical metamaterial

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science China(Technological sciences) 2024年第10期67卷 3221-3234页

作者： ZHU ShaoWei CHEN Huan YANG XiaoQiang TAN Li JIN Shuai CHEN LiMing LIU Tao TAN XiaoJun WANG LianChao WANG Bing MUAMER Kadic State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400030China College of Aerospace Engineering Chongqing UniversityChongqing 400030China School of Civil Aviation Northwestern Polytechnical UniversityXi’an 710129China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Institut FEMTO-ST CNRS UMR 6174University BourgogneFranche-ComtBesan¸con 25000France

As part of the 4th industrial revolution,programmable mechanical metamaterials exhibit great application potential in flexible robotics,vibration control,and impact ***,maintaining a programmed state without sustaining the external stimulus is often challenging and leads to additional energy *** by Rubik’s cube,we design and study an in-situ programmable and distribution-reconfigurable mechanical metamaterial(IPDR-MM).A matrix model is developed to model IPDR-MMs and describe their morphological *** on this model,the reinforcement learning method is employed to find the pathways for morphological *** find that IPDR-MMs have controllable stiffness across several orders of magnitude and a wide range of adjustable anisotropies through morphology ***,because of the independence of the directions of morphology transformation and bearing,IPDR-MMs exhibit good stability in bearing and can readily achieve high *** Rubik’s cube-inspired design concept is also instructive for other deformable structures and metamaterials,and the current version of the proposal should be sufficiently illustrative to attract and broaden interdisciplinary interests.

关键词： mechanical metamaterials in-situ programmable distribution-reconfigurable Rubik’s cube controllable stiffness and anisotropy

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Recent advances in metal-free CDs/g-C_(3)N_(4) photocatalysts:Synthetic strategies,mechanism insight,and applications

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Journal of Materials science & technology 2023年第19期150卷 11-26页

作者： Xingxing Yang Lina Sheng Yongli Ye Jiadi Sun Zaijun Li Xiao Ning Jin Cao Xiulan Sun State Key Laboratory of Food Science and Technology School of Food Science and TechnologyCollaborative Innovation Center of Food Safety and Quality ControlJiangnan UniversityWuxi 214122China Yixing Institute of Food and Biotechnology Co. LtdYixing 214200China School of Chemical and Material Engineering Jiangnan UniversityWuxi 214122China National Institutes for Food and Drug Control Beijing 100050China

Carbon dots/graphite carbon nitride(CDs/g-C_(3)N_(4)),a novel composite photocatalyst,has shown great po-tential for applications in energy regeneration and environmental remediation owing to its following advantages:metal-free,low cost,easily tunable,and excellent photocatalytic ***,we reviewed the development of synthetic strategies,photocatalytic enhancement mechanisms,and pho-tocatalytic applications of CDs/g-C_(3)N_(4) in this ***,the three composite strategies of CDs and g-C_(3)N_(4)-self-assembly,solvothermal,and calcination polymerization are outlined,and their advantages and disadvantages are described in ***,the photocatalytic enhancement mechanism of the com-posite strategies was elucidated according to the variation trends of CDs/g-C_(3)N_(4) band structure,electronic properties,light absorption range,and interfacial charge ***,the applications of CDs/g-C_(3)N_(4) in hydrogen evolution,pollutant degradation,CO_(2) reduction,and bacterial disinfection in recent years are reviewed ***,the current obstacles and future research directions of CDs/g-C_(3)N_(4) are discussed from the perspective of preparation technology and practical applications,respectively.

关键词： Photocatalysis Graphite carbon nitride Carbon dots Synthetic strategy Photocatalytic application

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