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In-situ TEM study of the effect of hydrogen-helium ratio on defect characteristics in Fe9Cr1.5W0.4Si F/M steel during H_(2)^(+)&He^(+)simultaneous irradiation

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Journal of Materials Science & technology 2024年第6期173卷 192-201页

作者： Dewang Cui Ziqi Cao Kun He Yuanming Li Xi Qiu Guang Ran College of Energy Xiamen UniversityXiamen 361102China Fujian Provincial Nuclear Energy Engineering Technology Research Center Xiamen 361102China Science and Technology on Reactor Fuel and Materials Laboratory Chengdu 610041China Nuclear Power Institute of China Chengdu 610041China Science and Technology on Reactor System Design Technology Laboratory Chengdu 610041China

The effect of hydrogen and helium interaction,especially H-He ratio,on the irradiation behavior of nuclear materials has not yet been ***,this is an important basis for evaluating the irradiation properties of nuclear materials and developing high irradiation resistant ***,30 keV H_(2)^(+)and He^(+)dual beams with four H-He ratios of 0:10,3:10,15:10,and 30:10 were used to irradiate the newly developed Fe9Cr1.5W0.4Si F/M steel in TEM to in-situ study the interaction and ratio effect of hydrogen and *** addition of H atoms significantly promoted the nucleation of dislocation loops and *** the early stage of irradiation,the average size and density of dislocation loops increased with the increase of H-He ***,the larger the H-He ratio,the easier it was to form a complex dislocation ***,the final saturation size of bubbles increased with the increase of H-He *** was first found that the swelling was affected by H concentrations,with high H concentrations slowing down the increase in *** a certain irradiation dose,a specific H-He ratio would lead to a swelling peak of Fe9Cr1.5W0.4Si F/M *** super-sized bubbles at grain boundaries(GBs)were found after H addition,resulting in a bigger swelling of GBs than the *** the swelling of the GBs and the matrix show a dependence on the H-He *** current work is of great significance for understanding the interaction between hydrogen and helium in nuclear materials.

关键词： Dose ratio effect Ferritic-martensitic steel Hydrogen&helium synergetic irradiation In-situ TEM

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Structural Design and Analysis of a Bionic Metacellular Robot Chassis 7

Structural Design and Analysis of a Bionic Metacellular Robo...

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2022 7th International Seminar on Computer technology, Mechanical and Electrical engineering, ISCME 2022

作者： Yang, Peijie Yang, Jian Yang, Jiaxin Liu, Li Peng, Yujie Chen, Jianwei Zhang, Bei Nie, Xuan Tian, Yingyu Sang, Ziyang School of Mechanical and Electrical Engineering Chengdu University of Technology China College of Nuclear Technology and Automation Engineering Chengdu University of Technology China

Aiming at the problems of lack of stability, poor adaptability, and weak load capacity of existing robots in complex environments. The corresponding adaptation methods are proposed through the analysis of various harsh environments in nature, and statistics are made. On this basis, a new type of metamorphic structure based on metamorphic theory and bionics principle is proposed, and the relevant mechanical structure of the chassis of the metamorphic robot is designed;The mechanical system and motion are designed, optimized, and analyzed by using Solidworks and MATLAB joint simulation platform;The motion planning and kinematics simulation of the bionic metamorphic robot chassis are carried out through ADAMS software;Stress simulation of loaded parts is carried out based on ANSYS. The results show that the design size and motion planning are reasonable and meet the bionic metamorphic robot chassis requirements for working environment and grasping operation. © Published under licence by IOP Publishing Ltd.

关键词： Bionics

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Characteristics of sub-synchronous oscillation in grid-connected wind farm system

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Journal of Electronic Science and technology 2023年第4期21卷 91-101页

作者： Yan Gong Qi Huang Dong-Sheng Cai Bamisile Olusola Olorunfemi School of Mechanical and Electrical Engineering University of Electronic Science and Technology of ChinaChengdu611731China Southwest University of Science and Technology Mianyang621010China The College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu610059China

With the rapid development of wind power, wind turbines are accompanied by a large quantity of power electronic converters connected to the grid, causing changes in the characteristics of the power system and leading to increasingly serious sub-synchronous oscillation (SSO) problems, which urgently require the generalized classification and characterization of the emerging oscillation problems. This paper classifies and characterizes the emerging types of SSO caused by grid-connected wind turbines to address these issues. Finally, the impact of the typical system parameters changes on the oscillation pattern is analyzed in depth to provide effective support for the subsequent suppression and prevention of SSO.

关键词： Characteristics Classification Sub-synchronous oscillation(SSO) Typical system parameters Wind farm

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Gaussian shaper for nuclear pulses based on multilevel cascade convolution

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nuclear Science and Techniques 2022年第12期33卷 116-127页

作者： Min Wang Jian‑Bin Zhou Xiao‑Ping Ouyang Ying‑Jie Ma Xu Hong College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyErxian Bridge No.1 East 3 RoadChenghua DistrictChengdu 610059China Northwest Institute of Nuclear Technology Xi’an 710024China

For nuclear measurements,it is necessary to obtain accurate information from nuclear pulses,which should be obtained by first shaping the pulses outputted by the ***,commonly used pulse-shaping algorithms have certain *** example,certain pulse-shaping algorithms have long dead-times in high-counting-rate environments or are difficult to achieve in digital *** signals are widely used in analog nuclear instruments owing to their symmetry and completeness.A Gaussian signal is usually implemented by using a multilevel S–K filter in series or in *** is difficult to construct a real-time digital Gaussian filter for the complex Gaussian filtering *** on the multilevel cascade convolution,a pulse-shaping algorithm for double exponential signals is proposed in this study,which,in addition to double exponential signals,allows more complex output signal models to be used in the new *** proposed algorithm can be used in high-counting-rate environments and has been implemented in an FPGA with fewer multipliers than those required in other traditional Gaussian pulse-shaping *** offline processing results indicated that the average peak base width of the output-shaped pulses obtained using the proposed algorithm was reduced compared with that obtained using the traditional Gaussian pulse-shaping *** results also demonstrated that signal-to-noise ratios and energy resolutions were improved,particularly for pulses with a low *** energy resolution was improved by 0.1–0.2%while improving the counting rate.

关键词： Impulse shaping Multilevel cascade convolution S–K filter Gaussian-like distribution Double exponential signal

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A digital multi-channel system based on parallel full comparison baseline restoration method 4

A digital multi-channel system based on parallel full compar...

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4th International Conference on Electronic Information engineering and Computer Communication, EIECC 2024

作者： Liu, Yang Xu, Mingxing Wang, Guangxi Yang, Yufeng Chengdu University of Technology College of Nuclear Technology and Automation Engineering Cheng Du China Key Laboratory of Sichuan Province Chengdu University of Technology Cheng Du China

ISBN: (纸本)9798331534622

This paper designs a baseline estimation digital energy spectrum measurement system using a parallel full-comparison method, aimed at reducing the impact of baseline drift on the energy resolution of the digital energy spectrum measurement system. The system consists of two parts: an analog baseline adjustment circuit and a digital baseline estimation module. The digital module first performs baseline estimation, then transmits the results to the frontend circuit to adjust the baseline, thereby correcting drift caused by circuit noise and signal pulse stacking. The system is mainly composed of a DAC baseline adjustment circuit, an ADC sampling circuit, and an FPGA-based digital multi-channel analysis system, in which a parallel full-comparison mean baseline estimation method is deployed to calculate the baseline adjustment amount. To verify the reliability of the system, NaI detectors were used in this study, and the energy resolution and response of the system were tested using dual-source137Cs and60Co. The experimental results show that the linear response fitting of the digital multi-channel energy spectrum measurement system exceeds 99.99%. Under high counting rates, the energy resolution without baseline recovery was 8.83% (@0.662 keV), while the energy resolution with the parallel full-comparison baseline recovery method was 7.57% (@0.662 keV), improving by 0.92%. In conclusion, compared to the system without baseline recovery, the parallel full-comparison baseline recovery method effectively alleviates the baseline drift issue of the NaI detector under high counting rates, thereby improving the energy resolution of the system. © 2024 IEEE.

关键词： Velocity measurement

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Fast nuclide identification based on a sequential Bayesian method

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nuclear Science and Techniques 2021年第12期32卷 116-127页

作者： Xiao-Zhe Li Qing-Xian Zhang He-Yi Tan Zhi-Qiang Cheng Liang-Quan Ge Guo-Qiang Zeng Wan-Chang Lai Chengdu University of Technology The College of Nuclear Technology and Automation EngineeringChengdu 610059China

The rapid identification of radioactive substances in public areas is ***,traditional nuclide identification methods only consider information regarding the full energy peaks of the gamma-ray spectrum and require long recording times,which lead to long response *** this paper,a novel identification method using the event mode sequence(EMS)information of target radionuclides is *** EMS of a target radionuclide and natural background radiation were established as two different probabilistic models and a decision function based on Bayesian inference and sequential testing was *** proposed detection scheme individually processes each *** a photon is detected and accepted,the corresponding posterior probability distribution parameters are estimated using Bayesian inference and the decision function is ***,value of the decision function is compared to preset detection thresholds to obtain a detection ***ments on different target radionuclides(137Cs and 60Co)were *** count rates of the regions of interest(ROI)in the backgrounds between[651,671],[1154,1186],and[1310,1350]keV were 2.35,5.14,and 0.57 CPS,*** experimental results demonstrate that the average detection time was 6.0 s for 60Co(with an activity of 80400 Bq)at a distance of 60 cm from the *** average detection time was 7 s for 137Cs(with an activity of 131000 Bq)at a distance of 90 cm from the *** results demonstrate that the proposed method can detect radioactive substances with low activity.

关键词： Natural radiation Nuclide identification Sequential testing nuclear safety

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A High-Precision Parameter Identification Method Based on Improved DFT for Sub-Super Synchronous Oscillations

A High-Precision Parameter Identification Method Based on Im...

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2024 IEEE IAS Industrial and Commercial Power System Asia, I and CPS Asia 2024

作者： Sun, Feiyu Cai, Dongsheng Zhang, Zhengyuan Huang, Qi The College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China School of Mechanical and Electrical Engineering University of Electronic Science and Technology of China Chengdu China School of Information Engineering Southwest University of Science and Technology Mianyang China

ISBN: (纸本)9798350352290

Wind energy has been employed extensively as a renewable energy source with the aim of carbon neutrality. The power system also makes extensive use of power electronic properties and lead to the sub/super-synchronous oscillation (Sub/Sup-SO) issue, which damages equipment and jeopardizes the power system's ability to operate safely and steadily. To improve the frequency band estimation range to 100 Hz, this research use Phasor Measurement Unit (PMU) instantaneous value data to determine the Sub/Sup-SO associated characteristics. To reduce the influence of spectral leakage and the fence effect, as well as to improve the identification accuracy of the related parameters, this paper adopts the RV self-convolutional window based Discrete Fourier Transform (DFT) and the Hanning double-window based all-phase Fast Fourier Transform (apFFT) hybrid algorithm to identify the Sub/Sup-SO modal parameters. We take into account the identification accuracy in complex cases, such as non-nominal frequencies, with noise effects and multiple Sub/Sup-SO modes. The simulation results show that the proposed method has high discrimination bandwidth, high discrimination accuracy and strong flexibility. © 2024 IEEE.

关键词： Frequency estimation

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Nanodiamond/Ti_(3)C_(2) MXene-coated quartz crystal microbalance humidity sensor with high sensitivity and high quality factor

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Rare Metals 2024年第6期43卷 2719-2729页

作者： Yao Yao Qiao Chen Yan-Qi Li Xian-He Huang Wei-Wei Ling Zhe-MiaoXie Jia-QiWang Chang-Ming Chen College of Communication Engineering Chengdu University of Information TechnologyChengdu 610225China School of Automation Chongqing University of Posts and TelecommunicationsChongqing 400065China School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Advanced Micro-/Nano-Devices Lab Department of Systems Design EngineeringUniversity of WaterlooWaterlooON N2L 3GlCanada

To address the challenge of achieving both high sensitivity and a high quality factor in quartz crystal microbalance(QCM)humidity sensors,a nanodiamond(ND)/Ti_(3)C_(2)MXene composite-coated QCM humidity sensor was *** material characteristics of ND,Ti_(3)C_(2)MXene,and ND/Ti_(3)C_(2)MXene composite were analyzed by transmission electron microscopy(TEM)and Fourier transform infrared(FTIR)*** experimental results demonstrated that the hydrophilic ND nanoparticles coated on Ti_(3)C_(2) MXene nanosheet prevented the self-stacking of Ti_(3)C_(2)MXene and enhanced the sensitivity of Ti_(3)C_(2) MXene-based QCM humidity ***,the high mechanical modulus of Ti_(3)C_(2) MXene material helped ND/Ti_(3)C_(2)MXene composite-coated QCM humidity sensor to achieve a high quality factor(>20,000).ND/Ti_(3)C_(2)MXene compositecoated QCM humidity sensor exhibited a sensitivity of 82.45 Hz/%RH,a humidity hysteresis of 1.1%RH,fast response/recovery times,acceptable repeatability,and good stability from 11.3%RH to 97.3%*** response mechanism of ND/Ti_(3)C_(2) MXene composite-coated QCM humidity sensor was analyzed in combination with a bi-exponential kinetic adsorption ***,the potential application of ND/Ti_(3)C_(2)MXene composite-coated QCM humidity sensor was demonstrated through its frequency response to wooden blocks with different moisture contents.

关键词： Humidity sensor Quartz crystal microbalance Nanodiamond Ti_(3)C_(2)MXene High quality factor

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Moving Object Tracking based on Kernel and Random-coupled Neural Network 6

Moving Object Tracking based on Kernel and Random-coupled Ne...

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6th ACM International Conference on Multimedia in Asia, MMAsia 2024

作者： Chen, Yiran Liu, Haoran Liu, Mingzhe Liu, Yanhua Wang, Ruili Li, Peng Chengdu University of Technology Chengdu China Wenzhou University of Technology Chengdu China Massey University Palmerston North New Zealand Southwestern Institute of Physics Chengdu China College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu610059 China

ISBN: (纸本)9798400712739

Moving object tracking on cost-effective hardware is a crucial need in numerous research and industrial applications. However, current deep learning-based tracking algorithms usually prioritize exceptional performance at the expense of increased computational load. Due to the unavailability of expensive GPUs for many tracking tasks, these popular trackers often fall short in providing robust tracking capabilities with affordable computational resources. This study introduces RCNNshift, a kernel-based tracker that relies on feature extraction from a random-coupled neural network. This visual cortex inspired neural model can extract image features without requiring cumbersome pre-training or deep neural connections. By utilizing an enhanced one-dimensional feature representation, RCNNshift demonstrates superior performance compared to other kernel-based object tracking methods, even those employing higher-dimensional feature spaces. Its improvement in precision and success plots of OPE, compared to the Meanshift and Camshift in the HSV and RGB color spaces, exceeds over 160% and 190% respectively. Comparative experiments have validated the robustness of RCNNshift, showcasing its superior performance over various kernel-based and particle filter trackers. Its combination of robustness and computational efficiency makes RCNNshift an ideal choice for mid to low-end object tracking tasks such as surveillance and underwater tracking. The source code is available at https://***/HaoranLiu507/RCNNshift. © 2024 Copyright held by the owner/author(s). Publication rights licensed to ACM.

关键词： Object detection

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Study on Beam Trajectory Deflection and Spatial Dose Distribution in Magnetic Resonance-Guided Proton Therapy 23rd

Study on Beam Trajectory Deflection and Spatial Dose Distrib...

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23rd Pacific Basin nuclear Conference, PBNC 2022

作者： Ren, Xiao-Qing Wang, Ming Wang, Xin-Chen Li, Meng Li, Guo-Dong Zhang, Lei School of Nuclear Technology and Automation Engineering Chengdu University of Technology Sichuan Chengdu China

ISBN: (纸本)9789811988981

Proton therapy can significantly inhibit the radiation damage of additional tissues, which is the development trend of cancer radiotherapy. At present, the randomness of range fluctuation of proton beam in the body is a technical bottleneck that limits the high-precision dose distribution of proton therapy. The targeting accuracy of proton therapy for moving soft-tissue tumours is expected to greatly improve by real-time magnetic resonance imaging (MRI) guidance. However, the magnetic field introduced by MRI will affect the transmission trajectory of proton beam, and then cause the deposition dose distortion in the body. Therefore, it is necessary to accurately evaluate the beam deflection trajectory under the three-dimension magnetic field. In this paper, with the help of Monte Carlo code TOPAS, the proton beam trajectory deflection under different magnetic field parameters is carried out, and the calculation accuracy of the mathematical model is verified by Monte Carlo algorithm. Then, the trajectories of primary protons and secondary particles (consider electrons and secondary protons) under different magnetic field are investigated. Moreover, comparison diagram of dose distribution before and after correction is presented in the paper. The analysis results of this paper will provide data reference for the dose correction of later MRI guided proton therapy device. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Proton beams

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