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Jiani Liu,Zheng-Yue Li,Xiaoyan Chen,Heping Huang,Furong Gui 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.3
The western flower thrips, Frankliniella occidentalis, is the most economically important agronomic pest withinThysanoptera because it is both a direct pest of horticulture crops and an efficient vector of plant viruses. Sixty-seven polymorphic SSR loci were identified in the contigs (containing redundant ESTs) generated byassembling 13,839 F. occidentalis ESTs from the public sequence database. Nineteen SSR markers exhibited polymorphismamong 860 samples from43 F. occidentalis populations,with alleles per SSR marker ranging fromtwoto eight, the effective number of alleles (Ne) range from 0.73 to 2.64; the observed (Ho) and expected (He) heterozygositiesranged from 0.09 to 0.77 and 0.12 to 0.96, respectively. The PIC values were from 0.24 to 0.73. AMOVA revealed most genetic variation resided within, rather than between, greenhouse and field isolates. The Mantel test showed no significant differences between genetic and geographical distances. We demonstratedthe value of mining the redundant sequences in public sequence databases for the development of polymorphicSSR markers, which can be used for better understanding population variation and spreading of the invasive pestF. occidentalis.
Li, Heping,Li, Hui,Liu, Yi,Huang, Xiaohua Korean Chemical Society 2015 대한화학회지 Vol.59 No.2
Two new chitosan derivatives, polyamine grafted chitosan copolymers have been synthesized for corrosion protection of carbon steel in acidic medium. First, methyl acrylate graft chitosan copolymer (CS-MAA) was prepared by the reaction of chitosan (CS) and methyl acrylate (MAA) via the Michael addition reaction. Then, CS-MAA was reacted with ethylene diamine (EN) and triethylene tetramine (TN) respectively to synthesize ethylene diamine grafted chitosan copolymer (CS-MAA-EN) and triethylene tetramine grafted chitosan copolymer (CS-MAA-TN), and the structures were characterized by Fourier-transform infrared spectroscopy (FT-IR). At last, the corrosion inhibition activities on Q235 carbon steel were investigated by using gravimetric measurements, metallographic microscope, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. The compounds CS-MAA-EN and CS-MAA-TN show an appreciable corrosion inhibition property against corrosion of Q235 carbon steel in 5% HCl solution at $25^{\circ}C$. It has been observed that CS-MAA-EN shows greater corrosion inhibition efficiency than CS-MAA-TN. The inhibition efficiency of CS-MAA-EN was close to 90% when the mass fraction concentration was 0.2%~0.3%; the inhibition efficiency of CS-MAA-TN was close to 85% when the mass fraction concentration was 0.02%. The present work provided very promising results in the preparation of green corrosion inhibitors.
A New Control Strategy for a Three-Phase PWM Current-Source Rectifier in the Stationary Frame
Guo, Qiang,Liu, Heping,Zhang, Yi The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.4
This paper presents a novel power control strategy for PWM current-source rectifiers (CSRs) in the stationary frame based on the instantaneous power theory. In the proposed control strategy, a virtual resistance based on the capacitor voltage feedback is used to realize the active damping. In addition, the proportional resonant (PR) controller under the two-phase stationary coordinate is designed to track the ac reference current and to avoid the strong coupling brought about by the coordinate transformation. The limitations on improving steady-state performance of the PR controller is investigated and mitigated using a cascaded lead-lag compensator. In the z-domain, a straightforward procedure is developed to analyze and design the control-loop with the help of MATLAB/SISO software tools. In addition, robustness against parameter variations is analyzed. Finally, simulation and experimental results verify the proposed control scheme and design method.
Wang, Dan,Liu, Wenjun,Ren, Yan,De, Liangliang,Zhang, Donglei,Yang, Yanrong,Bao, Qiuhua,Zhang, Heping,Menghe, Bilige Korean Society for Food Science of Animal Resource 2016 한국축산식품학회지 Vol.36 No.4
In this study, traditional culture method and 16S rRNA gene analysis were applied to reveal the composition and diversity of lactic acid bacteria (LAB) of fermented cow milk, huruud and urum from Baotou and Bayannur of midwestern Inner Mongolia. Also, the quantitative results of dominant LAB species in three different types of dairy products from Baotou and Bayannur were gained by quantitative polymerase chain reaction (q-PCR) technology. Two hundred and two LAB strains isolated from sixty-six samples were identified and classified into four genera, namely Enterococcus, Lactococcus, Lactobacillus, Leuconostoc, and twenty-one species and subspecies. From these isolates, Lactococcus lactis subsp. lactis (32.18%), Lactobacillus plantarum (12.38%) and Leuconosto mesenteroides (11.39%) were considered as the dominated LAB species under the condition of cultivating in MRS and M17 medium. And the q-PCR results revealed that the number of dominant species varied from samples to samples and from region to region. This study clearly shows the composition and diversity of LAB existing in fermented cow milk, huruud and urum, which could be considered as valuable resources for LAB isolation and further probiotic selection.
Ren, Yan,Liu, Wenjun,Zhang, Heping Korean Society for Food Science of Animal Resource 2015 한국축산식품학회지 Vol.35 No.5
The objective of this study was to identify the coccoidal bacteria present in 188 samples of fermented yaks’, mares’ and cows’ milk products collected from 12 different regions in Mongolia. Furthermore, we evaluated the fermentation properties of ten selected isolates of the predominant species, Streptococcus (S.) thermophiles, during the process of milk fermentation and subsequent storage of the resulting yoghurt at 4℃. Overall, 159 isolates were obtained from 188 samples using M17 agar. These isolates were presumed to be lactic acid bacteria based on their gram-positive and catalase-negative properties, and were identified to species level using 16S rRNA gene sequence analysis. These coccoid isolates were distributed in four genera and six species: Enterococcus (E.) durans, Enterococcus (E.) faecalis, Lactococcus (Lac.) subsp. lactis, Leuconostoc (Leuc.) lactis, Leuconostoc (Leuc.) mesenteroides. subsp. mesenteroides and S. thermophilus. Among these S. thermophilus was the most common species in most samples. From evaluation of the fermentation characteristics (viable counts, pH, titratable acidity [TA]) of ten selected S. thermophilus isolates we could identify four isolates (IMAU 20246, IMAU20764, IMAU20729 and IMAU20738) that were fast acid producers. IMAU20246 produced the highest concentrations of lactic acid and formic acid. These isolates have potential as starter cultures for yoghurt production.
A New Control Strategy for a Three-Phase PWM Current-Source Rectifier in the Stationary Frame
Qiang Guo,Heping Liu,Yi Zhang 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.4
This paper presents a novel power control strategy for PWM current-source rectifiers (CSRs) in the stationary frame based on the instantaneous power theory. In the proposed control strategy, a virtual resistance based on the capacitor voltage feedback is used to realize the active damping. In addition, the proportional resonant (PR) controller under the two-phase stationary coordinate is designed to track the ac reference current and to avoid the strong coupling brought about by the coordinate transformation. The limitations on improving steady-state performance of the PR controller is investigated and mitigated using a cascaded lead-lag compensator. In the z-domain, a straightforward procedure is developed to analyze and design the control-loop with the help of MATLAB/SISO software tools. In addition, robustness against parameter variations is analyzed. Finally, simulation and experimental results verify the proposed control scheme and design method.
Aying Zhang,Qi Yang;Heping Zhang;Chen Liu;Liping Huang;Lili Zhao 한국식물학회 2018 Journal of Plant Biology Vol.61 No.6
The NAC proteins are plant-specific transcriptionfactors and widely distributed in plants. The wide functionsof NAC transcription factors were studied, but the roles ofNAC in pollen development are largely unclear. Here, wefound that ZmNAC84 played a vital role in maize pollendevelopment. ZmRbohH showed high expression in pollen. ZmNAC84 inhibited the ZmRbohH expression by directlybinding to its promoter in pollen. Moreover, phosphorylationof ZmNAC84 at Ser113 played an important role in thisprocess. These results suggest that ZmNAC84 plays anegative role in pollen development possibly via repressingthe ZmRbohH expression.
Integrated Method for Text Detection in Natural Scene Images
( Yang Zheng ),( Jie Liu ),( Heping Liu ),( Qing Li ),( Gen Li ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.11
In this paper, we present a novel image operator to extract textual information in natural scene images. First, a powerful refiner called the Stroke Color Extension, which extends the widely used Stroke Width Transform by incorporating color information of strokes, is proposed to achieve significantly enhanced performance on intra-character connection and non-character removal. Second, a character classifier is trained by using gradient features. The classifier not only eliminates non-character components but also remains a large number of characters. Third, an effective extractor called the Character Color Transform combines color information of characters and geometry features. It is used to extract potential characters which are not correctly extracted in previous steps. Fourth, a Convolutional Neural Network model is used to verify text candidates, improving the performance of text detection. The proposed technique is tested on two public datasets, i.e., ICDAR2011 dataset and ICDAR2013 dataset. The experimental results show that our approach achieves state-of-the-art performance.