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827 results on '"Du, Pengfei"'

211. Identifying key mononuclear Fe species for low-temperature methane oxidation

Author

Yu, Tao, primary, Li, Zhi, additional, Jones, Wilm, additional, Liu, Yuanshuai, additional, He, Qian, additional, Song, Weiyu, additional, Du, Pengfei, additional, Yang, Bing, additional, An, Hongyu, additional, Farmer, Daniela M., additional, Qiu, Chengwu, additional, Wang, Aiqin, additional, Weckhuysen, Bert M., additional, Beale, Andrew M., additional, and Luo, Wenhao, additional

Published
2021
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214. Experimental demonstration of optical OFDM with subcarrier index modulation for IM/DD VLC

Author

Chen, Chen, Deng, Xiong, Yang, Yanbing, Du, Pengfei, Yang, Helin, Zhong, Wen De, Electrical Engineering, Signal Processing Systems, and Lighting and IoT Lab

Abstract

We for the first time experimentally demonstrate an IM/DD VLC system using optical OFDM with subcarrier index modulation (OFDM-SIM) and digital pre-equalization. Experimental results show that OFDM-SIM achieves greatly improved BER performance than classical OFDM.

Published
2019

215. A High-Accuracy Spatial Localization Methodology for Partial Discharge by UHF-Signal Sensor-Arrays

Author

Du Pengfei, Qi Zeng, Xing Zhang, and Kai Zhou

Subjects
Computer science, Acoustics, 05 social sciences, Skew, 050801 communication & media studies, Multilateration, Signal, Antenna array, 0508 media and communications, Narrowband, Transformation (function), Ultra high frequency, 0502 economics and business, Partial discharge, 050211 marketing
Abstract

Inspired by the idea of mobile targets localization by the antenna array, a novel localization methodology for the partial discharge (PD) source in power systems is proposed by using ultra-high frequency (UHF) sensor-arrays in this paper. Due to the broadband feature of UHF-signals emitted from PD source, a focusing algorithm, i.e., two-sided correlation transformation (TCT) algorithm, is utilized to transform the PD signals to the narrowband ones, which improves the accuracy of the direction-of-arrival (DoA) estimation at the sensor-array under the severe electromagnetic surroundings. Then, with the DoAs obtained from multiple sensor-arrays, a spatial localization paradigm for the PD source is introduced. Finally, the PD source can be localized within a spatial sphere formed by the multiple skew DoA-lines from these sensor-arrays. Based on the simulation with the experimental PD UHF-signal data, it is shown that the proposed methodology accurately localizes the PD source within the a small range of sphere under the severe testing situations, which improves the accuracy of PD source localization compared with the classic time-difference-of-arrival (TDoA) method.

Published
2019

216. Comparison of Differential Flavor Metabolites in Meat of Lubei White Goat, Jining Gray Goat and Boer Goat

Author

Du Pengfei, Sun Sujun, Meng Zhou, Wang Weiting, Liu Yaobo, Ru Yi, Bei Sun, Yongsheng Li, Shoujing Wang, Alexander Suvorov, and Hu Peng

Subjects
0301 basic medicine, flavor, biology, Endocrinology, Diabetes and Metabolism, goat, lcsh:QR1-502, 0402 animal and dairy science, food and beverages, 04 agricultural and veterinary sciences, biology.organism_classification, 040201 dairy & animal science, Biochemistry, lcsh:Microbiology, Article, 03 medical and health sciences, meat, 030104 developmental biology, Boer goat, metabonomics, Food science, Molecular Biology, Aroma, Flavor
Abstract

Flavor is one of the most important sensory characteristics of meat. The development of taste and aroma can be attributed to thousands of flavor molecules and precursors that are present in meat tissues. As a result, the identification of these flavor compounds and an improved understanding of their roles are necessary for improving the sensory quality and customer appeal of meat products. In the current study, we compared the metabolic profiles of meat specimens from the Lubei white goats (LBB), Boer goats (BE) and Jining grey goats (JNQ) by untargeted liquid chromatography-mass spectrometry. Our metabolomic data revealed that the three types of goat meat showed significantly different profiles of fatty acids, aldehydes, ketones, lactones, alkaloids, flavonoids, phenolics and drug residues, which could underpin the nuances of their flavors. Taken together, our results provided insights into the molecular basis for sensory variations between different goat meat products.

Published
2019
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217. MEMS-based strata deformation monitoring system for methane hydrate production areas: a conceptual design

Author

Jun Han, Chaopeng Wu, Du Pengfei, Danxiang Jing, and Wang Jieying

Subjects
010504 meteorology & atmospheric sciences, Mechanical Engineering, Ocean Engineering, Gyroscope, Deformation (meteorology), 010502 geochemistry & geophysics, Oceanography, Geodesy, 01 natural sciences, Pressure sensor, Displacement (vector), law.invention, Azimuth, Deformation monitoring, Conceptual design, Mechanics of Materials, law, Compass, Geology, 0105 earth and related environmental sciences, Marine engineering
Abstract

Seafloor deformation or displacement in methane hydrate production areas is a significant environmental problem that can cause considerable damage. This paper describes a conceptual design for monitoring seafloor deformation that differs from existing monitoring methods that include acoustic and pressure sensors, which have high costs and are only suitable for detecting vertical deformation. The proposed monitoring system is vertically mounted in each monitoring well to detect the displacement of submarine soil layers at different depths and to provide visual feedback by displaying three-dimensional images in real time. To reduce the drift error and to obtain more reliable angle estimates, a Kalman filter algorithm is used to combine the data that are measured using a gyroscope and a digital compass. The stability and accuracy of the system are tested both in real-time test and off-line experiment, and the total errors of the azimuth and tilt angle are less than 0.03° and 0.19° in the static off-line experiment, respectively.

Published
2017

223. Fluorescence immunoassay for multiplex detection of organophosphate pesticides in agro-products based on signal amplification of gold nanoparticles and oligonucleotides

Author

Zhang, Chan, primary, Jiang, Zejun, additional, Jin, Maojun, additional, Du, Pengfei, additional, Chen, Ge, additional, Cui, Xueyan, additional, Zhang, Yudan, additional, Qin, Guoxin, additional, Yan, Feiyan, additional, Abd El-Aty, A.M., additional, Hacimüftüoğlu, Ahmet, additional, and Wang, Jing, additional

Published
2020
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227. Magnetic field study in circular magnetron sputtering by COMSOL.

Author

LI Mengfei, YE Wei, and DU Pengfei

Subjects
MAGNETRONS, MAGNETIC fields, ELECTROMAGNETIC induction, SOFTWARE measurement, MAGNETRON sputtering, PERMANENT magnets, FIELD research, HEAT capacity
Abstract

In order to improve the uniformity of the horizontal magnetic induction on the target surface, a cathode target configuration with a cylindrical permanent magnet inside and some cuboidal permanent magnets outside arranged roundly was designed for circular magnetron sputtering. The magnetic field was simulated by COMSOL software and verified by measurement. The experimental results were basically consistent with the simulation results. The magnetic field of the circular plane was distributed uniformly, and met the basic requirements of magnetic induction i.e. 20-50 mT for magnetron sputtering. The target utilization rate reached 40%-50%, and the heat dissipation capacity was improved to a certain extent. [ABSTRACT FROM AUTHOR]

Published
2022
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236. A sensitive fluorometric bio-barcodes immunoassay for detection of triazophos residue in agricultural products and water samples by iterative cycles of DNA-RNA hybridization and dissociation of fluorophores by Ribonuclease H

Author

Zhang, Xiuyuan, primary, Du, Pengfei, additional, Cui, Xueyan, additional, Chen, Ge, additional, Wang, Yuanshang, additional, Zhang, Yudan, additional, Abd El-Aty, A.M., additional, Hacımüftüoğlu, Ahmet, additional, Wang, Jing, additional, He, Hongjun, additional, Jin, Maojun, additional, and Hammock, Bruce, additional

Published
2020
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249. Enhancing the Sensitivity of the Bio-barcode Immunoassay for Triazophos Detection Based on Nanoparticles and Droplet Digital Polymerase Chain Reaction

Author

Cui, Xueyan, primary, Jin, Maojun, additional, Zhang, Chan, additional, Du, Pengfei, additional, Chen, Ge, additional, Qin, Guoxin, additional, Jiang, Zejun, additional, Zhang, Yudan, additional, Li, Mingjie, additional, Liao, Yun, additional, Wang, Yuanshang, additional, Cao, Zhen, additional, Yan, Feiyan, additional, Abd El-Aty, A. M., additional, and Wang, Jing, additional

Published
2019
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