Study on Denoising Method of Photoionization Detector Based on Wavelet Packet Transform

Article Chemistry, Analytical

Detection of four alcohol homologue gases by ZnO gas sensor in dynamic interval temperature modulation mode

Fanli Meng et al.

Summary: This paper successfully detected four alcohol homologue gases using a ZnO gas sensor with dynamic temperature modulation method, achieving a recognition accuracy of 97.62% after optimization with decision tree classification algorithm.

SENSORS AND ACTUATORS B-CHEMICAL (2022)

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Article Ergonomics

Fault diagnosis for train plug door using weighted fractional wavelet packet decomposition energy entropy

Yongkui Sun et al.

Summary: This paper proposes a non-contact fault diagnosis method for train plug doors based on sound signals. The method utilizes empirical mode decomposition and signal reconstruction to process raw sound signals. It also introduces the concept of fractional calculus and weight to develop a novel feature named weighted fractional wavelet packet decomposition energy entropy. The proposed method achieves the best accuracy of 97.87% in fault diagnosis of train plug doors, as verified through field-collected data and compared with different fault diagnosis methods.

ACCIDENT ANALYSIS AND PREVENTION (2022)

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Review Materials Science, Composites

The Damage Identification in Laminated Composite Plate under Fatigue Load through Wavelet Packet Energy Curvature Difference Method

Wael A. Altabey

Summary: In this study, a damage identification framework for Basalt Fiber Reinforced Polymer (BFRP) composite plate systems is proposed using the wavelet packet energy curvature difference (WPECD) method. By combining finite element modeling and accumulative damage modeling, the proposed method can effectively identify different types of damage.

COMPOSITES PART C: OPEN ACCESS (2022)

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Article Environmental Sciences

Field Test of Mini Photoionization Detector-Based Sensors-Monitoring of Volatile Organic Pollutants in Ambient Air

Jiri Bilek et al.

Summary: Determining concentrations of organic compounds in ambient air using reference methods is time-consuming. Continuous sensory measurement offers advantages in terms of speed, resolution, cost, and usability. However, concerns remain regarding the quality of data obtained through sensory measurements.

ENVIRONMENTS (2022)

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Article Engineering, Electrical & Electronic

A Low-Power Wearable E-Nose System Based on a Capacitive Micromachined Ultrasonic Transducer (CMUT) Array for Indoor VOC Monitoring

Marzana Mantasha Mahmud et al.

Summary: This paper presents a low-power wearable e-nose system based on a CMUT array, capable of detecting various volatile organic compounds with high resolution. Through linear discriminant analysis, the discrimination performance of the sensor array can be visualized.

IEEE SENSORS JOURNAL (2021)

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Article Chemistry, Analytical

Perovskite-structured LaCoO3 modified ZnO gas sensor and investigation on its gas sensing mechanism by first principle

Wenbo Qin et al.

Summary: LaCoO3 nanoparticles were synthesized by sol-gel method and modified on the surface of ZnO to prepare LCO/ZnO nanometer flake materials with improved gas-sensitive response. The LCO/ZnO sensor showed significantly enhanced response to ethanol gas, shorter response time and recovery time at an optimal operating temperature of 320 degrees C. Analysis of the sensitization mechanism revealed that the improved sensing performance was attributed to the increase of surface adsorbed oxygen content and the strong catalytic oxidation activity of LCO.

SENSORS AND ACTUATORS B-CHEMICAL (2021)

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Article Chemistry, Analytical

Development and validation of a point-of-care breath test for octane detection

Laura A. Hagens et al.

Summary: This study demonstrates that a newly developed POC breath test can reliably detect octane in the exhaled breath of invasively ventilated ICU patients. The method shows excellent repeatability and is able to detect clinically relevant levels of octane in low ppb range.

ANALYST (2021)

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Article Engineering, Electrical & Electronic

Ppb-Level Xylene Gas Sensors Based on Co3O4 Nanoparticle-Coated Reduced Graphene Oxide(rGO) Nanosheets Operating at Low Temperature

Fanli Meng et al.

Summary: This article presents a one-step hydrothermal method for the preparation of rGO/Co3O4 nanocomposites and their performance testing. The results show that 1rGO/Co3O4 (335 wt%) has the best sensitivity to xylene gas, with an optimal working temperature of 175 degrees Celsius, and can detect xylene gas with a minimum concentration of 1 pph.

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT (2021)

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Article Computer Science, Artificial Intelligence