Pingjuan Niu
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View article: Liquid Crystal Metasurface Enabled Hyperspectral Single-pixel Imaging
Liquid Crystal Metasurface Enabled Hyperspectral Single-pixel Imaging Open
Near-infrared (NIR) hyperspectral imaging emerges as a versatile, non-destructive method for material characterisation by acquiring spatial-spectral data cubes. Yet, conventional implementations demand costly InGaAs focal-plane arrays and …
View article: Etching p-GaN to manage current spreading to reduce surface recombination in AlGaN micro-LEDs
Etching p-GaN to manage current spreading to reduce surface recombination in AlGaN micro-LEDs Open
Due to the high perimeter-to-area ratio of AlGaN-based deep ultraviolet (DUV) micro-light-emitting diodes (micro-LEDs), the current can easily spread to the mesa sidewall with etching damage, leading to more carriers participating in surfa…
View article: Research on Improved Technology of Totem-Pole Bridgeless PFC Circuit Based on Triangular Current Mode
Research on Improved Technology of Totem-Pole Bridgeless PFC Circuit Based on Triangular Current Mode Open
The totem-pole bridgeless power factor correction (PFC) circuit based on the triangular current mode (TCM) in the front-end PFC of a switching power supply has the advantage of realizing zero-voltage switching (ZVS) in the full working ran…
View article: Design and analysis of magnetic circuit for mass transfer 6-DOF magnetic levitation platform
Design and analysis of magnetic circuit for mass transfer 6-DOF magnetic levitation platform Open
Mini/Micro LED is a new display technology, it has advantages of long-life, energy-saving, fast response speed and brightness. The mass transfer speed of Mini/Micro LED is main challenge for its large-scale application. Magnetic levitation…
View article: Pulsed Electric Current-Assisted Transient Liquid Phase Sintering for Extremely Reliable Cu-Cu Direct Bonding
Pulsed Electric Current-Assisted Transient Liquid Phase Sintering for Extremely Reliable Cu-Cu Direct Bonding Open
View article: Design and optimization of all-dielectric focusing metasurface antennas
Design and optimization of all-dielectric focusing metasurface antennas Open
View article: Magnetic circuit optimisation and actuator suspension experiment of the 6‐DOF magnetic suspension platform for mini/micro LED
Magnetic circuit optimisation and actuator suspension experiment of the 6‐DOF magnetic suspension platform for mini/micro LED Open
To improve the speed of mass transfer, a magnetic suspension platform (MSP) is used to transport the display chips. A novel 6‐DOF MSP is proposed in this paper. An improved Halbach array is used to supply the magnetic flux density. Two typ…
View article: Research on vibration test method of electric actuator
Research on vibration test method of electric actuator Open
The stable, safe, and reliable operation of electric actuator valve systems is of great significance in industrial production. This paper proposes a vibration test method for electric actuators, employing the test to meet the test severity…
View article: Anisotropic sensing based on single ReS<sub>2</sub> flake for VOCs discrimination
Anisotropic sensing based on single ReS<sub>2</sub> flake for VOCs discrimination Open
Selective and sensitive detection of volatile organic compounds (VOCs) holds paramount importance in real-world applications. This study proposes an innovative approach utilizing a single ReS 2 field-effect transistor (FET) characterized b…
View article: Fuzzy PID control of permanent magnet synchronous motor electric steering engine by improved beetle antennae search algorithm
Fuzzy PID control of permanent magnet synchronous motor electric steering engine by improved beetle antennae search algorithm Open
View article: A single micro-LED manipulation system based on micro-gripper
A single micro-LED manipulation system based on micro-gripper Open
Micro-LEDs (μLEDs) have advantages in terms of brightness, power consumption, and response speed. In addition, they can also be used as micro-sensors implanted in the body via flexible electronic skin. One of the key techniques involved in…
View article: High thrust focused magnetic linear motor for needling massive transfer platform
High thrust focused magnetic linear motor for needling massive transfer platform Open
针对针刺式巨量转移平台用无铁芯直线电机推力小,边缘效应明显导致转移速度慢的问题,提出一种高推力聚磁式直线电机,利用外层V字形结构抑制漏磁效应,通过双层Halbach结构提高气隙磁密,并采用有限元法对3种方案气隙磁密和漏磁磁通进行比较分析。V形双层Halbach方案的气隙磁密和漏磁磁通分别为0.6 T和0.05 T,与单层梯形方案相比气隙磁密提高了17.6%,与双层Halbach方案相比漏磁磁通降低了71.4%。利用等效磁化电流法对电机磁场进行区域分割,采用分割补偿法建立矩形…
View article: Strategies and challenges for improving the performance of two-dimensional materials-based gas sensors
Strategies and challenges for improving the performance of two-dimensional materials-based gas sensors Open
Two-dimensional (2D) materials emerged in the last decade have been considered as an attractive class of gas sensing materials due to their large surface-to-volume ratio, high surface reaction activity and good gas adsorption performance p…
View article: A Novel Deep Convolutional Neural Network Combining Global Feature Extraction and Detailed Feature Extraction for Bearing Compound Fault Diagnosis
A Novel Deep Convolutional Neural Network Combining Global Feature Extraction and Detailed Feature Extraction for Bearing Compound Fault Diagnosis Open
This study researched the application of a convolutional neural network (CNN) to a bearing compound fault diagnosis. The proposed idea lies in the ability of CNN to automatically extract fault features from complex raw signals. In our appr…
View article: Optoelectronic Materials, Devices, and Applications
Optoelectronic Materials, Devices, and Applications Open
This Special Issue entitled “Optoelectronic Materials, Devices, and Applications” is devoted to gathering a broad array of research papers on the latest advances in the development of optoelectronic materials and devices of semiconductors,…
View article: Graphene-coated D-shaped terahertz fiber modulator
Graphene-coated D-shaped terahertz fiber modulator Open
A terahertz (THz) fiber is of interest due to low loss and easy beam shaping. Graphene plays an important role in modulating the optical signal. In this paper, a graphene-coated D-shaped THz fiber modulator is proposed. The performance of …
View article: High surface quality heteroepitaxy <i>α</i>-Ga<sub>2</sub>O<sub>3</sub> film on sapphire by mist-CVD technique
High surface quality heteroepitaxy <i>α</i>-Ga<sub>2</sub>O<sub>3</sub> film on sapphire by mist-CVD technique Open
An ultra-flat heteroepitaxy α -Ga 2 O 3 thin film, paved a glory future for device fabrication, was successfully obtained on a c -plane sapphire substrate through the employment of the mist chemical vapor deposition technique. Atomic force…
View article: Piecewise Hybrid System with Cross-Correlation Spectral Kurtosis for Fault Diagnosis in Rolling Bearing of Wind Power Generator
Piecewise Hybrid System with Cross-Correlation Spectral Kurtosis for Fault Diagnosis in Rolling Bearing of Wind Power Generator Open
As the core equipment of wind turbines, rolling bearings affect the normal operation of wind power generators, resulting in huge economic losses and significant social impacts in the case of faults. Most faults are not easily found because…
View article: Synergistically Enhanced Thermoelectric and Mechanical Performance of Bi2te3 Via Industrial Scalable Hot Extrusion Method for Cooling and Power Generation Applications
Synergistically Enhanced Thermoelectric and Mechanical Performance of Bi2te3 Via Industrial Scalable Hot Extrusion Method for Cooling and Power Generation Applications Open
View article: A digital hologram-based encryption and compression method for 3D models
A digital hologram-based encryption and compression method for 3D models Open
This study proposes a novel method to compress and decompress the 3D models for safe transmission and storage. The 3D models are first extracted to become 3D point clouds, which would be classified by the K-means algorithm. Then, these nea…
View article: Artificial Intelligence-Assisted Terahertz Imaging for Rapid and Label-Free Identification of Efficient Light Formula in Laser Therapy
Artificial Intelligence-Assisted Terahertz Imaging for Rapid and Label-Free Identification of Efficient Light Formula in Laser Therapy Open
Photodynamic therapy (PDT) is considered a promising noninvasive therapeutic strategy in biomedicine, especially by utilizing low-level laser therapy (LLLT) in visible and near-infrared spectra to trigger biological responses. The major ch…
View article: The Adhesive Force Measurement between Single μLED and Substrate Based on Atomic Force Microscope
The Adhesive Force Measurement between Single μLED and Substrate Based on Atomic Force Microscope Open
Compared with traditional liquid crystal and organic light emitting diode (OLED), micro light emitting diode (μLED) has advantages in brightness, power consumption, and response speed. It has important applications in microelectronics, mic…
View article: Low-Frequency Terahertz Photonic Crystal Waveguide with a Lilac-Shaped Defect Based on Stereolithography 3D Printing
Low-Frequency Terahertz Photonic Crystal Waveguide with a Lilac-Shaped Defect Based on Stereolithography 3D Printing Open
Terahertz (THz) photonic crystal (PC) waveguides show promise as an efficient and versatile waveguiding platform for communication, sensing, and imaging. However, low-frequency THz PC waveguides with a low-cost and easy fabrication remain …
View article: Novel Magnetic Suspension Platform with Three Types of Magnetic Bearings for Mass Transfer
Novel Magnetic Suspension Platform with Three Types of Magnetic Bearings for Mass Transfer Open
For ultra-precision, large stroke, and high start/stop acceleration, a novel magnetic suspension platform with three types of magnetic bearings is proposed. The structure and working principle of the novel platform are introduced. The pass…
View article: Strain Relaxation Effect on the Peak Wavelength of Blue InGaN/GaN Multi-Quantum Well Micro-LEDs
Strain Relaxation Effect on the Peak Wavelength of Blue InGaN/GaN Multi-Quantum Well Micro-LEDs Open
In this paper, the edge strain relaxation of InGaN/GaN MQW micro-pillars is studied. Micro-pillar arrays with a diameter of 3–20 μm were prepared on a blue GaN LED wafer by inductively coupled plasma (ICP) etching. The peak wavelength shif…
View article: Magnetic Circuit Design and Experiment of Novel Lorentz Magnetic Bearing with Double Air Gap
Magnetic Circuit Design and Experiment of Novel Lorentz Magnetic Bearing with Double Air Gap Open
A uniform magnetic density distribution in the air gap is key for the Lorentz magnetic bearing to achieve high precision control and large torque output. To overcome the small magnetic field strength in an explicit magnetic bearing and a h…
View article: Design and Analysis of a 6-DOF Magnetic Suspension Platform with an Improved Permanent Magnetic Array
Design and Analysis of a 6-DOF Magnetic Suspension Platform with an Improved Permanent Magnetic Array Open
For ultra-precision, large stroke, and high start/stop acceleration, a novel 6-DOF magnetic suspension platform with a novel structure of the permanent array is proposed. The structure and the working principle of the novel platform are in…
View article: Numerical Demonstration of 800 Gbps WDM Silicon Photonic Transmitter with Sub-Decibel Surface-Normal Optical Interfaces
Numerical Demonstration of 800 Gbps WDM Silicon Photonic Transmitter with Sub-Decibel Surface-Normal Optical Interfaces Open
We propose and numerically demonstrate an 800 Gbps silicon photonic transmitter with sub-decibel surface-normal optical interfaces. The silicon photonic transmitter is composed of eight silicon Mach–Zehnder optical modulators and an interl…
View article: Design and analysis of Lorentz magnetic bearing for magnetic suspended control and sensing gyroscope
Design and analysis of Lorentz magnetic bearing for magnetic suspended control and sensing gyroscope Open
To improve the control accuracy and output torque of magnetic suspend and control gyroscope, a Lorentz magnetic bearing with double second auxiliary air gap is proposed, and its mechanical structure is introduced. Frist, the structure and …
View article: Cooling and Mechanical Performance Analysis of a Trapezoidal Thermoelectric Cooler with Variable Cross-Section
Cooling and Mechanical Performance Analysis of a Trapezoidal Thermoelectric Cooler with Variable Cross-Section Open
In this study, a full-scale three-dimensional trapezoidal thermoelectric cooler model is constructed to study its cooling performance and mechanical reliability using finite element simulation. Temperature dependent material properties are…