Yongtao Li

Guangxi University of Science and Technology

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Hanyan Li

Henan University of Technology

Jinjun Feng

Beijing Vaccum Electronic Research Institute

Guangzhi Hu

Yunnan University

Xamxikamar Mamat

Xinjiang Technical Institute of Physics & Chemistry

Thomas Wågberg

Umeå University

Sanshuang Gao

Yunnan University

Xun Hu

Wuhan Center for Disease Control and Prevention

Yiqin Chen

Hunan University

Quan Xiang

Amazon (United States)

Danfeng Qin

Guangxi University of Science and Technology

Cooperative Institutions

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Xinjiang Technical Institute of Physics & Chemistry

Hunan University

Guangxi University of Science and Technology

Institute of Microelectronics

Changsha University

Institute of Hydrobiology

Tsinghua University

Huazhong University of Science and Technology

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Investigation of Spindt Cold Cathode Electron Guns for Terahertz Traveling Wave Tubes

Electronics (2023)

Yongtao Li Hanyan Li Jinjun Feng

In this work, a Spindt cold cathode electron gun with a PPM (periodic permanent magnet) focusing system for a terahertz TWT (traveling wave tube) was designed and simulated based on the Pierce electron gun structure. More specifically, a new 3D (three dimensional) emission model was used, where the cathode radius of the electron gun was 1 mm and the cathode current was 30 mA, with an emitting half angle of about 28°. It was demonstrated that the electron beam was well focused with an electron beam radius of 0.3 mm and a filling ratio of 0.5 when the maximum value of the PPM field along with the axis was 0.122T. According to the simulation results, a planar cold cathode electron gun was developed. Measurements demonstrated that the I/V characteristics of the cold cathode gun were consistent with that of a cold cathode, revealing that the electrons emitted from the cathode are not intercepted when passing through the electron gun.

Electron gun

Cold cathode

Traveling-wave tube

10.3390/electronics12204197

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Polysulfide/Graphene Nanocomposite Film for Simultaneous Electrochemical Determination of Cadmium and Lead Ions

NANO (2018)

Ruyuan Jiang Niantao Liu Yuhong Su Sanshuang Gao Xamxikamar Mamat

An integrative electroanalytical method was developed for detecting Cd[Formula: see text] and Pb[Formula: see text] ions in aqueous solutions. Polysulfide/graphene (RGO-S) nanocomposites were prepared and their performance as electrochemical sensors for Cd[Formula: see text] and Pb[Formula: see text] was evaluated. The RGO-S nanocomposite was carefully characterized by scanning electron microscopy with energy-dispersive X-ray spectrometry, transmission electron microscopy, and X-ray photoelectron spectroscopy. The as-prepared RGO-S was incorporated into a pyrolytic graphite electrode (RGO-S/PGE) and used for detecting trace amount of Cd[Formula: see text] and Pb[Formula: see text] by differential pulse anodic stripping voltammetry. Under optimal conditions, the stripping peak current of RGO-S/PGE varies linearly with heavy metal ion concentration in the ranges 2.0–300[Formula: see text][Formula: see text]g L[Formula: see text] for Cd[Formula: see text] and 1.0–300[Formula: see text][Formula: see text]g L[Formula: see text] for Pb[Formula: see text]. The limits of detection for Cd[Formula: see text] and Pb[Formula: see text] were estimated to be about 0.67[Formula: see text][Formula: see text]g L[Formula: see text] and 0.17[Formula: see text][Formula: see text]g L[Formula: see text], respectively. The prepared electrochemical heavy-metal-detecting electrode provides good repeatability and reproducibility with high sensitivity, making it a suitable candidate for monitoring Cd[Formula: see text] and Pb[Formula: see text] concentrations in aqueous environmental samples.

10.1142/s179329201850090x

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Citations (8)

Fabrication of 340-GHz Folded Waveguides Using KMPR Photoresist

IEEE Electron Device Letters (2013)

Hanyan Li Yongtao Li Jinjun Feng

This letter presents the fabrication of 340-GHz copper folded waveguides (FWGs) using the UV-LIGA method. During the process, KMPR photoresist was employed instead of SU-8 due to its easy removability after electroforming. KMPR patterns with a sidewall height of 300 $\mu\hbox{m}$ and a trench width of 100 $\mu\hbox{m}$ were achieved repeatedly under one single-spin deposition and optimized processing conditions, such as UV exposure dose and KMPR bake temperature and time. The dimensional accuracies of the wide side (500 $\mu\hbox{m}$ ) and narrow side (100 $\mu\hbox{m}$ ) of the copper FWGs were found to be $\leqslant \hbox{6}$ and $\leqslant \hbox{2}\ \mu\hbox{m}$ , respectively, and the sidewall surface roughness was about 44 nm, with a profile of about 90 $^{\circ}$ .

Photoresist

10.1109/led.2013.2241389

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Citations (26)

An Electrochemical Sensor Based on Green γ-AlOOH-Carbonated Bacterial Cellulose Hybrids for Simultaneous Determination Trace Levels of Cd(II) and Pb(II) in Drinking Water

Journal of The Electrochemical Society (2018)

Danfeng Qin Xun Hu Yemin Dong Xamxikamar Mamat Yongtao Li

An eco-friendly γ-AlOOH-carbonated bacterial cellulose (γ-AlOOH-CBC) hybrids material was fabricated by simple pyrolysis and hydrothermal treatments. The obtained hybrids possess an intrinsic 3D nanofibrous structure decorated with chaff-like γ-AlOOH particles. Owing to the good adsorption property and conductive, γ-AlOOH-CBC hybrids were used to modified the glass carbon electrode (GCE) for simultaneous determination of Cd(II) and Pb(II) in aqueous samples by differential pulse anodic stripping voltammetry (DPASV) method. Various parameters affected Cd(II) and Pb(II) measurement were optimized. Under the optimal conditions, the limit of detection (S/N = 3) of the γ-AlOOH-CBC modified electrode was evaluated to be 0.17 μg•L−1 for Cd(II) and 0.10 μg•L−1 for Pb(II) with the linear range of the calibration curves ranged 0.5–250 μg•L−1 for Cd(II) and Pb(II). Furthermore, the developed electrode was also successfully utilized for monitoring trace Cd(II) and Pb(II) in drinking water samples with satisfactory results.

Anodic Stripping Voltammetry

Bacterial Cellulose

Standard addition

Stripping (fiber)

10.1149/2.1321807jes

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Citations (25)

Target Recognition Based on Infrared and Visible Image Fusion and Improved YOLOv8 Algorithm

Sensors (2024)

Wei Guo Yongtao Li Hanyan Li Ziyou Chen Enyong Xu

In response to the issue that the fusion process of infrared and visible images is easily affected by lighting factors, in this paper, we propose an adaptive illumination perception fusion mechanism, which was integrated into an infrared and visible image fusion network. Spatial attention mechanisms were applied to both infrared images and visible images for feature extraction. Deep convolutional neural networks were utilized for further feature information extraction. The adaptive illumination perception fusion mechanism is then integrated into the image reconstruction process to reduce the impact of lighting variations in the fused images. A Median Strengthening Channel and Spatial Attention Module (MSCS) was designed to be integrated into the backbone of YOLOv8. In this paper, we used the fusion network to create a dataset named

10.3390/s24186025

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A Facile Electrochemical Sensor Based on PyTS–CNTs for Simultaneous Determination of Cadmium and Lead Ions

Sensors (2018)

Ruyuan Jiang Niantao Liu Sanshuang Gao Xamxikamar Mamat Yuhong Su

A simple and easy method was implemented for the contemporary detection of cadmium (Cd2+) and lead (Pb2+) ions using 1,3,6,8-pyrenetetrasulfonic acid sodium salt-functionalized carbon nanotubes nanocomposites (PyTS⁻CNTs). The morphology and composition of the obtained PyTS⁻CNTs were characterized using scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and X-ray photoelectron spectroscopy (XPS). The experimental results confirmed that the fabricated PyTS⁻CNTs exhibited good selectivity and sensitivity for metal ion-sensing owing to the insertion of sulfonic acid groups. For Cd2+ and Pb2+, some of the electrochemical sensing parameters were evaluated by varying data such as the PyTS⁻CNT quantity loaded on the pyrolytic graphite electrode (PGE), pH of the acetate buffer, deposition time, and deposition potential. These parameters were optimized with differential pulse anodic sweeping voltammetry (DPASV). Under the optimal condition, the stripping peak current of the PyTS⁻CNTs/Nafion/PGE varies linearly with the heavy metal ion concentration, ranging from 1.0 μg L-1 to 90 μg L-1 for Cd2+ and from 1.0 μg L-1 to 110 μg L-1 for Pb2+. The limits of detection were estimated to be approximately 0.8 μg L-1 for Cd2+ and 0.02 μg L-1 for Pb2+. The proposed PyTS⁻CNTs/Nafion/PGE can be used as a rapid, simple, and controllable electrochemical sensor for the determination of toxic Cd2+ and Pb2+.

Nafion

Pyrolytic carbon

Electrochemical gas sensor

Anodic Stripping Voltammetry

10.3390/s18051567

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Citations (44)

Fabrication of Fabry–Perot-cavity-based monolithic full-color filter arrays using a template-confined micro-reflow process

Journal of Micromechanics and Microengineering (2018)

Yasi Wang Xupeng Zhu Yiqin Chen Huimin Shi Zhiqin Li

Transmissive color filters based on metal-dielectric-metal (MDM) Fabry–Perot (FP) resonators are of great interest for various applications due to their high stability, environmental friendliness and chemical inertia. However, it is still technically challenging to obtain a compact monolithic MDM-based color filter array (CFA) because of the difficulty in achieving microscale-pixelated stepwise dielectric films with designed thickness. In this work, we proposed a template-confined thermal reflow approach to fabricate monolithic CFA based on silver–polymethyl methacrylate–silver (Ag–PMMA–Ag) sandwich configuration. Via template-confined thermal reflow of periodic PMMA nanogratings with different filling density, the thickness of PMMA dielectric layer in each pixel can be independently controlled, enabling the spectral tunability across the whole visible light region with high transmission efficiency and narrow linewidth. Compared to conventional multiple deposition technique, the approach we proposed is able to control the thickness of dielectric film via a single exposure step and can be potentially applied in high-throughput production by combining nanoimprint lithography.

Nanoimprint lithography

Shadow mask

Microscale chemistry

Color filter array

Digital Light Processing

10.1088/1361-6439/aaf6cb

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Citations (12)

Mm-level ultra-thick folded waveguide structures fabricated by UV-LIGA for W-band TWTs

Microelectronic Engineering (2021)

Yongtao Li Hanyan Li Zhenglin Li Jinjun Feng Fengyi Liao

LIGA

10.1016/j.mee.2021.111592

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Citations (2)

Evaluation method of continuous laser interference effect

Journal of Applied Optics (2022)

WU Fengling Yongtao Li

采用改进后的图像相关度计算方法,在精确配准干扰前后图像的基础上,以像素为单位计算图像相关度,根据人眼识别效果在评估前确定干扰阈值,计算图像有效干扰像元统计值,定量描述激光干扰效果;开展多波段激光干扰成像系统试验,采集不同干扰功率下的激光干扰图像,评估干扰效果。结果表明,该方法能精确识别图像局部变化,客观反映图像质量变化,对各波段不同功率下的激光干扰成像图像给出科学评估结果,对单对图像的处理速度优于s级,具有一定的工程应用价值。

10.5768/jao202243.0207002

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Citations (1)

Reliability analysis of distributed electric aircraft propulsion system

Yongtao Li

10.1109/icepet61938.2024.10626969

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