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161 results on '"Cui, Hairong"'

4. Music Chord Recognition Based on Robust PCP Feature and SVM

Author

Cui, Hairong, Li, Kan, Editor-in-Chief, Li, Qingyong, Associate Editor, Fournier-Viger, Philippe, Series Editor, Hong, Wei-Chiang, Series Editor, Liang, Xun, Series Editor, Wang, Long, Series Editor, Xu, Xuesong, Series Editor, Fox, Bob, editor, Zhao, Chuan, editor, and Anthony, Marcus T., editor

Published
2023
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31. The dynamic causality in sporadic bursts between CO2 emission allowance prices and clean energy index.

Author

Lu, Xunfa, Liu, Kai, Liang, Xiang San, Lai, Kin Keung, and Cui, Hairong

Subjects
CLEAN energy, PRICES, GAMMA ray bursts, CARBON emissions
Abstract

This study examines the dynamic causality between the carbon emission market and the clean energy market, using an information flow-based, quantitative Liang causality analysis which is firmly grounded on physics and derived from first principles. The dynamic causal relationships between European Union Allowance (EUA) prices and clean energy index allow us to explore whether the causality in return or in variance from CO2 emission allowances to the clean energy index is time-varying. The results show that the causal relationships in return and in variance between EUA and Clean Energy Index (CEI) are drastically time-varying. For the causality in return, a significant unidirectional long-term and stable causality from CEI to EUA is identified after March 2020. For that in variance, a bidirectional causality is found after March 2020, but values after 2020 are opposite to those in return. It seems when fluctuations in the clean energy market are low, the clean energy market has a weak causal effect on the carbon emission market but when volatility in the clean energy market is increasing, causalities between the two markets are significantly strengthened. These results obtained through this rigorous causality analysis can serve as a reference for academics, market participants, and policymakers to understand the underlying links between EUA prices and clean energy index. [ABSTRACT FROM AUTHOR]

Published
2022
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36. Simultaneous determination of acetamiprid and 6-chloronicotinic acid in environmental samples by using ion chromatography hyphenated to online photoinduced fluorescence detector

Author

Dandan Guo, Qamar Subhani, Nadeem Muhammad, Zhouman Huang, Muhammad Asif, Yan Zhu, Cui Hairong, Muhammad Zahid, and Irshad Hussain

Subjects
Detection limit, Analyte, Chromatography, 010401 analytical chemistry, Ion chromatography, Filtration and Separation, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Fluorescence, Fluorescence spectroscopy, 0104 chemical sciences, Analytical Chemistry, chemistry.chemical_compound, Column chromatography, chemistry, 0210 nano-technology, Acetonitrile, Derivatization
Abstract

This study aims to introduce a simple, sensitive, and cost-effective method for the simultaneous determination of acetamiprid and its main metabolite 6-chloronicotinic acid in environmental samples by using a nonsuppressed ion chromatography hyphenated with an online postcolumn photoinduced fluorescence detection system. The fluorescence detector wavelengths λex /λem = 257/382 nm was set for up to 6.0 min for acetamiprid, while λex /λem = 231/370 nm programmed for 6-chloronicotinic acid for the rest of the analysis time. Both samples were treated by applying miniaturized quick, easy, cheap, effective, rugged, and safe method before the separation of analytes on an IonPac® AS11-HC column by pumping 40 mM NaOH having minuscule content of acetonitrile (5%, v/v) as an eluent. Both intrinsically nonfluorescent analytes were turned-on by online postcolumn photoinduced derivatization, avoiding the need for complex chemical derivatization or addition of a postcolumn extra pump. The developed method was appraised for the analysis of environmental samples, exhibiting excellent linearity (0.050-10 μg/mL) with a correlation coefficient greater than 0.9993 for both analytes. Whereas, obtained limit of detection (0.025-0.0072 μg/mL), recoveries (98.02-116.00%), and inter- and intraday precision (≤3.02 %) were satisfactory for both compounds in environmental samples.

Published
2020

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