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17 results on '"Zheng, Haijie"'

1. Data Quality Identification Model for Power Big Data

Author

Zheng, Haijie, Tian, Bing, Liu, Xiaobao, Zhang, Wenbin, Liu, Shenqi, Wang, Cong, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Wang, Yang, editor, Zhu, Guobin, editor, Han, Qilong, editor, Zhang, Liehui, editor, Song, Xianhua, editor, and Lu, Zeguang, editor

Published
2022
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8. Data quality improvement method based on data correlation for power Internet of Things

Author

Qilin Yin, Dong Li, Zheng Haijie, Shuangshuang Guo, Ying Liu, and Li Yan

Subjects
Computer science, Reliability (computer networking), Data quality, Data mining, Autoregressive integrated moving average, Data loss, Time series, computer.software_genre, Missing data, computer, Data type, Data modeling
Abstract

In the current power Internet of Things, there are confusions in business data management, data models are not unified, and data loss problems are serious. Aiming at the problem of data loss, this paper proposes a new data quality improvement method for power IoT data The method divides the data into time-dependent sequence data and time-random sequence data depending on whether the data has relevance. According to the degree of data loss, the data is divided into severe missing data and a small amount of missing data. Finally, according to the divided data types, the data is complemented by the ARIMA model, the average interpolation method, etc. and the completed data sequence is obtained. After that, experiments were carried out using simulation data based on real data, and the reliability of the method was proved.

Published
2019

16. [Quantitative determination of six coumarins in Angelica dahurica var. formosana by RRLC-UV].

Author

Deng R, Zhang J, Luo W, Zhou L, Zheng H, and Zhang Y

Subjects
Chromatography, High Pressure Liquid instrumentation, Chromatography, Reverse-Phase methods, Plant Extracts isolation & purification, Angelica chemistry, Chromatography, High Pressure Liquid methods, Coumarins analysis, Plant Extracts analysis
Abstract

Objective: To establish a RRLC-UV method for simultaneous determination of oxypeucedanin hydrate, bergapten, oxypeucedanin, imperatorin, cnidilin and oxypeucedanin in Angelica dahurica var. formosana., Method: The analysis was carried out on a Agilent Zorbax SB-C, (4.6 mm x 100 mm, 1.8 microm) column eluted with the mobile phases of methanol (A)-water (B) in gradient elution. The flow rate was 1.0 mL x min(-1), and the UV detection wavelength was set at 310 nm., Result: All calibration curves of six coumarins showed good linearity regression within test ranges (r > 0.9998), and the overrall recoveries were in the range of 99.42%-101.4%, with RSD less than 2.4%., Conclusion: The method is simple, sensitive, reliable and reproducible which can be used for the quality study of Angelica dahurica var. formnosana.

Published
2010

17. [Simultaneous determination of six alkaloids in Coptis chinensis of different regions by RP-HPLC].

Author

Geng Z, Zheng H, Zhang Y, Luo W, and Qu X

Subjects
Berberine analogs & derivatives, Berberine isolation & purification, Berberine pharmacology, Berberine therapeutic use, Berberine Alkaloids isolation & purification, Drugs, Chinese Herbal, Alkaloids isolation & purification, Chromatography, High Pressure Liquid methods, Coptis chemistry
Abstract

A reversed-phase HPLC method for simultaneous determination of gatrorrhizine, columbamine, epiberberine, coptisine, palmatine and berberine in Coptis chinensis was developed. Analysis was carried out on an Xtimate C18 column (4.6 mm x 250 mm, 5 microm) eluted with acetonitrile-30 mmol x L(-1) ammonium bicarbonate solution (including 0.7% ammonia and 0.1% triethylamine) by gradient elution. The detective wavelength was 270 nm, the column temperature was 30 degrees C, and the flow rate was 1.0 mL x min(-1). By the above method, the linear ranges of gatrorrhizine, columbamine, epiberberine, coptisine, palmatine and berberine were 0.85-16.96 (r = 0.9997), 1.25-24.96 (r = 0.999 5), 2.05-40.96 (r = 0.999 9), 3.65-72.96 (r = 0.999 9), 2.88-57.60 (r = 0. 999 8),13.25-264.96 mg x L(-1) (r = 0.999 6), respectively. The average recoveries (n = 6) of the six alkaloids were 101.6% (RSD 1.3%),102.5% (RSD 1.5%), 100.8% (RSD 1.9%),102. 6% (RSD 1.2%), 97.80% (RSD 1.3%), 99.01% (RSD 1.5%), respectively. The determined results demonstrate that there is a significant difference in the contents of six alkaloids and total alkaloids among the tested samples. The method is accurate, reliable and repeatable for simultaneous determination of gatrorrhizine, columbamine, epiberberine, coptisine, palmatine and berberine in C. chinensis.

Published
2010

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