Mr. Qingren Jin Profile

Qingren Jin

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Proceedings Article | 19 June 2024 Paper

Preparation and performances study of amphiphobic coatings with UV-resistant properties

Min Yu, Qinqin Liang, Qingren Jin, Jiqi Pan, Ying Meng, Mengzhu Hu

Proceedings Volume 13172, 1317204 (2024) https://doi.org/10.1117/12.3032347

KEYWORDS: Liquids

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By designing and preparing dendritic silica nanoparticles (MSN-T) loaded with UV shielding agents and adding them to silicone polyurethane resins, amphiphobic coatings with both UV-resistant properties were obtained. The spectral properties of the UV shielding of the transparent amphiphobic coatings were analyzed, and the results showed that the UV absorber had a good effect on the UV shielding of the transparent amphiphobic coatings in the range of 200-370 nm. In addition, the prepared amphiphobic coatings have good liquid-repellent effects on various liquids such as water, diiodomethane and glycerol.

Proceedings Article | 28 July 2022 Paper

Frequency adjustable energy harvesting for autonomous wireless sensor nodes

Ke Zhou, Qingren Jin, Xiaoming Wang, Bin Feng, Hongdi Sun, Bing Tian, Jingzhong Ma

Proceedings Volume 12303, 123031L (2022) https://doi.org/10.1117/12.2642583

KEYWORDS: Sensors, Energy harvesting, Transmitters, Receivers, Automatic control, Environmental sensing

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Vibration energy harvesting is a very promising technology for powering wireless sensor nodes. However, the narrow and fixed frequency bands of common vibration energy harvesters greatly limit their widespread applications. In this paper, a mass with movable gravity center is introduced to the cantilever beam of piezoelectric energy harvester for frequency adjustment, and it is used as a power source of an autonomous wireless accelerometer. The frequency of the energy harvester can be adjusted from 130 Hz to 180 Hz. Its output electrical current is rectified, and the electrical energy is stored in an electrolytic capacitor. An automatic voltage regulator circuit is developed as a DC-DC converter to stabilize the output voltage, as well as automatically control the sleep and active mode cycles of the wireless accelerometer. A commercially available MEMS accelerometer is used in the system. An RF transmitter module with a frequency of 315MHz is used for the transmission of acceleration data. The data is wirelessly received by another RF receiving module and recorded in the computer. All parts of the wireless sensor system, including the automatic voltage regulator circuit, accelerometer, and RF transmitter module, are powered by the vibration energy harvester. When the autonomous wireless accelerometer works under the vibration condition of 0.17g @ 177 Hz, the system sends an acceleration data sequence once every 16 s, and the duty cycle of the wirelessly received sensor signal is 0.75%.

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