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Spatiotemporal evolution laws of sector-shaped dielectric-barrier-discharge plasma actuator

Plasma science and technology 2024年第10期26卷 108-115页

作者： Borui ZHENG Jianbo ZHANG Shaojie QI Jianghua XU Yiche LI Yuanzhong JIN Dongliang BIAN School of Automation and Information Engineering Xi’an University of TechnologyXi’an 710048People’s Republic of China Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing Xi’an 710048People’s Republic of China School of Mechanical and Precision Instrument Engineering Xi’an University of TechnologyXi’an 710048People’s Republic of China Science and Technology on Plasma Dynamics Laboratory Air Force Engineering UniversityXi’an 710038People’s Republic of China

Dielectric barrier discharge(DBD)plasma actuators are widely used in active flow control due to their simple design and rapid ***,they need more effectiveness and discharge *** overcome these limitations,a sector-shaped dielectric barrier discharge(SS-DBD)plasma actuator with an adjustable jet angle was developed to enhance flow control *** flow field dynamics induced by the SS-DBD plasma actuator were quantitatively analyzed using particle image velocimetry(PIV).Experimental investigations showed that precise adjustments to the actuation voltage can modulate the maximum velocity of the induced ***,a quasi-linear relationship between the sector-shaped angles of the SS-DBD and the deflected jet angles was established,indicating that changes in the sector-shaped angles directly influence the direction of the deflected *** correlation enables precise control over jet angles,significantly enhancing flow control by adjusting the SS-DBD-PA's sector-shaped angle.

关键词： plasma flow control plasma actuator particle image velocimetry

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Multitarget gas alarm system for high-performance and anti-interference chemical warfare agents simulants detection

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science China(Technological sciences) 2025年第3期68卷 349-358页

作者： Yubin YUAN Qiang WU Menglong JIAO Haiyang WU Weihua LIU Xuming WANG xiangrui BU Gong LI Chuanyu HAN Long HU xin LI xiaoli WANG Shool of Microelectronics School of Electronics and Information EngineeringXi’an Jiaotong UniversityXi’an710049China The Key Lab of Micro-nano Electronics and System Integration of Xi’an City Xi’an710049China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou310024China School of Automation and Information Engineering Xi’an University of TechnologyXi’an710048China Key Laboratory for Physical Electronics and Devices of the Ministry of Education Xi’an Jiaotong UniversityXi’an710049China School of Science Xi’an Jiaotong UniversityXi’an710049China

Chemical warfare agents(CWAs)can cause significant harm to health and even death in a very short time even when inhaled in small amounts(~100 mg min/m^(3)).Detection equipment based on conventional techniques,including gas chromatography-mass spectrometry,Raman spectroscopy,fluorescence spectroscopy,and ion mobility spectrometry,have the disadvantages of high cost,long detection time,and high power ***,portable,and convenient equipment for target CWAs detection under interference is a *** this study,we propose an alarm system comprising a multitype micro sensor array and a field-programmable gate array-based readout circuit for CWAs simulants *** common volatile organic compound,temperature,and water vapor interference,the proposed multitype sensor-based detection system realizes an alarm function in less than 20 s with thresholds of 1 ppm dimethyl methylphosphonate(DMMP),4.6 ppm 2,2'-dichlorodiethyl ether(DCE),and 20 ppm SO_(2).Furthermore,the proposed detection system was evaluated outside the laboratory and passed the wilderness test,demonstrating its reliability in the *** believe that the proposed alarm system will contribute to the development of intelligent,portable,low-cost,and anti-interference CWAs detection technology.

关键词： alarm system CWAs simulants surface acoustic wave sensor mixed gas anti-interference

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Convolutional Neural Network Image Classification Based on Different Color Spaces

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Tsinghua science and technology 2025年第1期30卷 402-417页

作者： Zixiang xian Rubing Huang Dave Towey Chuan Yue School of Computer Science and Engineering Macao University of Science and TechnologyMacao 999078China School of Computer Science University of Nottingham Ningbo ChinaNingbo 315100China

Although Convolutional Neural Networks(CNNs)have achieved remarkable success in image classification,most CNNs use image datasets in the Red-Green-Blue(RGB)color space(one of the most commonly used color spaces).The existing literature regarding the influence of color space use on the performance of CNNs is *** paper explores the impact of different color spaces on image classification using *** compare the performance of five CNN models with different convolution operations and numbers of layers on four image datasets,each converted to nine color *** find that color space selection can significantly affect classification accuracy,and that some classes are more sensitive to color space changes than *** color spaces may have different expression abilities for different image features,such as brightness,saturation,hue,*** leverage the complementary information from different color spaces,we propose a pseudo-Siamese network that fuses two color spaces without modifying the network *** experiments show that our proposed model can outperform the single-color-space models on most *** also find that our method is simple,flexible,and compatible with any CNN and image dataset.

关键词： color space Convolutional Neural Network(CNN) image classification pseudo-Siamese network

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Refinement modeling and verification of secure operating systems for communication in digital twins

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Digital Communications and Networks 2024年第2期10卷 304-314页

作者： Zhenjiang Qian Gaofei Sun xiaoshuang xing Gaurav Dhiman School of Computer Science and Engineering Changshu Institute of TechnologySuzhou215500China University Centre for Research and Development Department of Computer Science and EngineeringChandigarh UniversityMohali140413India Department of Computer Science and Engineering Graphic Era Deemed to be UniversityDehradun248002India

In traditional digital twin communication system testing,we can apply test cases as completely as possible in order to ensure the correctness of the system implementation,and even then,there is no guarantee that the digital twin communication system implementation is completely *** verification is currently recognized as a method to ensure the correctness of software system for communication in digital twins because it uses rigorous mathematical methods to verify the correctness of systems for communication in digital twins and can effectively help system designers determine whether the system is designed and implemented *** this paper,we use the interactive theorem proving tool Isabelle/HOL to construct the formal model of the X86 architecture,and to model the related assembly *** verification result shows that the system states obtained after the operations of relevant assembly instructions is consistent with the expected states,indicating that the system meets the design expectations.

关键词： Theorem proving Isabelle/HOL Formal verification System modeling Correctness verification

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SA-Model:Multi-Feature Fusion Poetic Sentiment Analysis Based on a Hybrid Word Vector Model

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computer Modeling in engineering & sciences 2023年第10期137卷 631-645页

作者： Lingli Zhang Yadong Wu Qikai Chu Pan Li Guijuan Wang Weihan Zhang Yu Qiu Yi Li School of Computer Science and Engineering Sichuan University of Science and EngineeringZigong643000China School of Automation and Information Engineering Sichuan University of Science and EngineeringZigong643000China School of Computer Science and Technology Southwest University of Science and TechnologyMianyang621000China School of Information Engineering Southwest University of Science and TechnologyMianyang621000China

Sentiment analysis in Chinese classical poetry has become a prominent topic in historical and cultural tracing,ancient literature research,***,the existing research on sentiment analysis is relatively *** does not effectively solve the problems such as the weak feature extraction ability of poetry text,which leads to the low performance of the model on sentiment analysis for Chinese classical *** this research,we offer the SA-Model,a poetic sentiment analysis ***-Model firstly extracts text vector information and fuses it through Bidirectional encoder representation from transformers-Whole word masking-extension(BERT-wwmext)and Enhanced representation through knowledge integration(ERNIE)to enrich text vector information;Secondly,it incorporates numerous encoders to remove text features at multiple levels,thereby increasing text feature information,improving text semantics accuracy,and enhancing the model’s learning and generalization capabilities;finally,multi-feature fusion poetry sentiment analysis model is *** feasibility and accuracy of the model are validated through the ancient poetry sentiment *** with other baseline models,the experimental findings indicate that SA-Model may increase the accuracy of text semantics and hence improve the capability of poetry sentiment analysis.

关键词： Sentiment analysis Chinese classical poetry natural language processing BERT-wwm-ext ERNIE multi-feature fusion

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Real-time holographic camera for obtaining real 3D scene hologram

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Light(science & Applications) 2025年第3期14卷 789-799页

作者： Zhao-Song Li Chao Liu xiao-Wei Li Yi Zheng Qian Huang Yi-Wei Zheng Ye-Hao Hou Chen-Liang Chang Da-Wei Zhang Song-Lin Zhuang Di Wang Qiong-Hua Wang School of Instrumentation and Optoelectronic Engineering Beihang UniversityBeijing100191China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China

As a frontier technology,holography has important research values in fields such as bio-micrographic imaging,light feld modulation and data ***,the real-time acquisition of 3D scenes and high-fidelity reconstruction technology has not yet made a breakthrough,which has seriously hindered the development of ***,a novel holographic camera is proposed to solve the above inherent problems *** proposed holographic camera consists of the acquisition end and the calculation *** the acquisition end of the holographic camera,specially configured liquid materials and liquid lens structure based on voice-coil motor-driving are used to produce the liquid camera,so that the liquid camera can quickly capture the focus stack of the real 3D scene within 15 *** the calculation end,a new structured focus stack network(FS-Net)is designed for hologram *** training the FS-Net with the focus stack renderer and learnable Zernike phase,it enables hologram calculation within 13 *** the first device to achieve real-time incoherent acquisition and high-fidelity holographic reconstruction of a real 3D scene,our proposed holographic camera breaks technical bottlenecks of difficulty in acquiring the real 3D scene,low quality of the holographic reconstructed image,and incorrect defocus *** experimental results demonstrate the effectiveness of our holographic camera in the acquisition of focal plane information and hologram calculation of the real 3D *** proposed holographic camera opens up a new way for the application of holography in fields such as 3D display,light field modulation,and 3D measurement.

关键词： holographic camera feld modulation hologram calculation liquid lens structured focus stack network D scene reconstruction d scenes real time acquisition

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A Conformal Wearable Antenna Based on Artificial Magnetic Conductor for GPS Applications

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Progress In Electromagnetics Research C 2023年 138卷 131-144页

作者： Wang, Shuqi Shi, Yuqin School of Communication and Information Engineering Xi’an University of Science and Technology Xi’an710054 China

In order to improve the efficiency and safety of emergency rescue operations, a wearable circularly polarized (CP) antenna suitable for GPS applications has been designed. It adopts a coplanar waveguide (CPW)-fed structure, where the ground plane and radiation patch form an annular gap. The impedance bandwidth and axial ratio performance are enhanced by adjusting the amplitude and phase difference of the current distribution through two pairs of notches and open-circuit branches. When the single antenna is more than 20 millimeters away from the human body model, its CP radiation performance is acceptable, and the peak Specific Absorption Rate (SAR) also meets the required standards. To minimize the separation distance between the antenna and the human body, a 2 × 2 Artificial Magnetic Conductor (AMC) with in-phase reflection characteristics is integrated at the antenna’s bottom as a reflector, which increases the antenna gain and reduces the SAR. Simulation and test results indicate that in the GPS L1 frequency band, the antenna achieves a gain greater than 7 dBi, an axial ratio less than 2 dB, a front-to-back ratio of 24 dB, and a peak SAR of 0.53 W/Kg, which is well below the standard limit of 1.6 W/Kg set by the Federal Communications Commission (FCC). Compared with other relevant antennas, this antenna features compact size, wide impedance bandwidth, and robust anti-interference capability, effectively improving the flexibility and compatibility of the wearable antenna, thereby meeting the demand for efficient and reliable positioning of rescuers. © 2023, Electromagnetics Academy. All rights reserved.

关键词： Wearable antennas

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Application of epoxy resin in cultural relics protection

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Chinese Chemical Letters 2024年第4期35卷 31-42页

作者： Zhaoru Chen xiaoxu Liu Haonan Chen Jialong Li xiaofeng Wang Jianfeng Zhu Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials School of Material Science and EngineeringShaanxi University of Science and TechnologyXi'an 710021China College of Mechanical&Electrical Engineering Shaanxi University of Science and TechnologyXi'an 710021China

Cultural relics have their unique artistic, cultural and historical value, and the protection of important cultural relics is conducive to the inheritance of historical culture. As a kind of cementing agent and binder commonly seen in cultural relics protection, epoxy resin is widely used in the bonding and consolidation of various materials in cultural relics, which has important practical application value. In this review, a systematic classification of commonly used epoxy resins, including their molecular structures, synthesis reactions and properties are provided, the problems and solutions of epoxy resin in cultural relics protection are summarized. The solutions are classified into three aspects: functional epoxy resin, blending modification, and other modification. Representative application examples of epoxy resin are listed in the field of cultural relics protection, and the development direction of epoxy resin in cultural relics protection in the future is proposed, which provides useful guidance for the modification of epoxy resin and its application in cultural relics protection in the future.

关键词： Epoxy resin Cultural relics Modified UV resistance

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High Strength and Heat Resistance of Low-RE-Containing Mg Alloy Achieved via Substantial Dynamic Precipitates

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Acta Metallurgica Sinica(English Letters) 2024年第11期37卷 1830-1842页

作者： Dongdong Zhang Mingyang Chen xiaoru Zhang Ke Li Liqing Wang Zhanyong Zhao Peikang Bai Daqing Fang College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan030024China School of Materials Science and Engineering North University of ChinaTaiyuan030051China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an710049China

Conventional high-strength Mg-RE-based wrought alloys usually contain a high amount of RE solutes,which largely increases the alloy cost and thus restricts their *** this work,we developed a low-RE-containing Mg-3Sm-1Nd-0.6Zn-0.4Zr alloy by hot extrusion with low extrusion ratio,which shows a high tensile yield strength(TYS)of 435 MPa and a satisfactory elongation of 5.6%at room temperature,outperforming most Mg-Gd-Y-based extrusion alloys with RE contents of 12 wt%at *** high-temperature strength,such as the TYS of 280 MPa at 200℃ and 251 MPa at 250℃,is also obtained in this *** alloy presented a typical bimodal grain structure including coarse hot-worked grains with a strong texture and fine recrystallized grains with random ***,abundant Mg3RE particles were mostly introduced in hot-worked grains and at recrystallized grain boundaries by dynamic precipitation during ***,the high strength of this alloy is principally attributed to the combined hardening effect of numerous Mg_(3)RE particles,fine recrystallized grains,and strongly textural hot-worked grains,rather than the ultra-strong age-hardening effect in traditional high RE-alloyed Mg alloys.

关键词： High strength Mg-RE alloys Dynamic precipitation Heat resistance

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Facile synthesis of porous TiO_(2)/SnO_(2)nanocomposite as lithium ion battery anode with enhanced cycling stability via nanoconfinement effect

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Chinese Chemical Letters 2024年第11期35卷 543-548页

作者： xingang Kong Yabei Su Cuijuan xing Weijie Cheng Jianfeng Huang Lifeng Zhang Haibo Ouyang Qi Feng School of Materials Science and Engineering Shaanxi University of Science and TechnologyXi'an 710021China College of Chemistry and Chemical Engineering Xingtai UniversityXingtai 054001China

SnO_(2)is a potential anode material with high theoretical capacity for lithium-ion batteries(LIBs),however,its applications have been limited by the severe volume expansion during charging-discharging *** this work,an inverse opal TiO_(2)/SnO_(2)composite with an interconnect network nanostructure was designed to confine Sn O_(2)nanoparticles in the porous TiO_(2).Due to this nanoconfinement structure,the volume expansion in the process was effectively alleviated,therefore the safety performance and cycling stability of the battery were effectively *** the same time,with a large number of microporous structures in the framework,the appearance of pseudocapacitance improves the rate performance and reversible *** terms of electrochemical kinetics,its framework provides the connected path for charge migration,effectively reducing the charge transfer impedance,meanwhile,quantities of micropores in its skeleton could provide a smoother channel for lithium ions,thus greatly improving the diffusion rate of *** design of this nanostructure provides a new idea for the research of SnO_(2)-based anode with effectively enhanced electrochemical performance,which is promising anode for practical application.

关键词： Inverse opal TiO_(2)/SnO_(2) Nanocon finement Lithium-ion batteries Stability Pseudocapacitance

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