Key Application Technologies of High Efficiency Power Quality Control Systems

Ding-Guo Liu,Zhi-kang Shuai,Chun-ming Tu,Ying Cheng,An Luo 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.3

Large capacity reactive power compensation and harmonic control in the low-voltage grid of an enterprise, are important technical means to improve power quality and reduce power loss. In this paper, the principle of an efficient power quality controller is analyzed. Then, key application technologies of the HPQC which would influence the performances of the HPQC are studied. Based on an analysis of the harmonic shunt problem, a frequency dividing control strategy of the HPQC continuous subsystem is proposed. A parameter design method of the HPQC discrete subsystem and its installation method are also proposed to ensure the system compensation effect. HPQC systems have been designed for a copper foil plant. The effectiveness of this paper has been verified by the simulation and application results.

Key Application Technologies of High Efficiency Power Quality Control Systems

Liu, Ding-Guo,Shuai, Zhi-Kang,Tu, Chun-Ming,Cheng, Ying,Luo, An The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.3

Large capacity reactive power compensation and harmonic control in the low-voltage grid of an enterprise, are important technical means to improve power quality and reduce power loss. In this paper, the principle of an efficient power quality controller is analyzed. Then, key application technologies of the HPQC which would influence the performances of the HPQC are studied. Based on an analysis of the harmonic shunt problem, a frequency dividing control strategy of the HPQC continuous subsystem is proposed. A parameter design method of the HPQC discrete subsystem and its installation method are also proposed to ensure the system compensation effect. HPQC systems have been designed for a copper foil plant. The effectiveness of this paper has been verified by the simulation and application results.

Exploration of Trade-Off Between Elastic Modulus and Strength of Mg–Gd–Y–Nd–Zr Alloy by Regulating Intermetallic Phases Through Si Addition

Liqun Guan,Yunlai Deng,Yaofeng Luo,An Luo,Xiaobin Guo 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10

In this study, low-cost Si was added to an Mg–8Gd–4Y–1Nd–0.5Zr alloy to regulate the intermetallic phases. The mechanicalproperties of 0, 0.5, and 1.0 wt% Si-added alloys were studied to explore the trade-off between the elastic modulus andstrength. The microstructures were characterized through metallographic microscopy, scanning electron microscopy applyingenergy dispersive spectroscopy, and transmission electron microscopy. The microstructures demonstrated that Y5Si3and GdSi phases formed and consumed the solid soluble Gd and Y elements, thus reducing the amount of precipitation andincreasing the size of the β′ phase. Correlations between the elastic modulus and the intermetallic phase indicated that theY5Si3and GdSi phases formed by the addition of Si were the mainly responsible for the improvement in the elastic modulus. The change in strength through the addition of Si was calculated, and the results revealed that such an addition could increasethe elastic modulus but with a reduction in the alloy strength. The addition of 0.5 wt% Si alloy resulted in a relatively highcomprehensive performance, with an elastic modulus of 46 GPa, a tensile strength of 278 MPa, a yield strength of 226 MPa,and an elongation of 4.9% under a cast-T6 state.

The Retention Behavior of Ginsenosides in HPLC and Its Application to Quality Assessment of Radix Ginseng

Hu, Ping,Luo, Guo-An,Wang, Qing,Zhao, Zhong-Zhen,Wang, Wan,Jiang, Zhi-Hong 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.10

This study systematically investigated the retention behavior of seven neutral ginsenosides $Rg_1$, Re, Rf, $Rb_1$, $Rb_2$, Rc, Rd, and an acidic ginsenoside $R_0$, the major pharmacologically active components of Radix Ginseng with RP-HPLC. The effects of solvent, pH value, ionic strength of the mobile phase, and column temperature were investigated using an octadecylsiloxane-bonded silica gel column. Based on the ginsenosides' retention characteristics, the concentration of acetonitrile and the gradient of the mobile phase needed to maintain the baseline separation of the major neutral ginsenosides in Radix Ginseng were theoretically predicted. Furthermore, the ionic strength of mobile-phase necessary to achieve good resolution of the neutral ginsenosides and acidic ginsenosides was carefully investigated. According to the results of the quantitative analysis of ginsenosides in eight batches of ginseng samples from different sources, the developed HPLC technique may be a valuable tool for the quality assessment of Radix Ginseng.

The Retention Behavior of Ginsenosides in HPLC and Its Application to Quality Assessment of Radix Ginseng

Ping Hu,Guo-An Luo,Zhong-Zhen Zhao,Wan Wang,Qing Wang,Zhi-Hong Jiang 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.10

This study systematically investigated the retention behavior of seven neutral ginsenosides Rg₁, Re, Rf, Rb₁, Rb₂, Rc, Rd, and an acidic ginsenoside R0, the major pharmacologically active components of Radix Ginseng with RP-HPLC. The effects of solvent, pH value, ionic strength of the mobile phase, and column temperature were investigated using an octadecylsiloxane-bonded silica gel column. Based on the ginsenosides’ retention characteristics, the concentration of acetonitrile and the gradient of the mobile phase needed to maintain the baseline separation of the major neutral ginsenosides in Radix Ginseng were theoretically predicted. Furthermore, the ionic strength of mobile-phase necessary to achieve good resolution of the neutral ginsenosides and acidic ginsenosides was carefully investigated. According to the results of the quantitative analysis of ginsenosides in eight batches of ginseng samples from different sources, the developed HPLC technique may be a valuable tool for the quality assessment of Radix Ginseng.

Analysis the role of arabidopsis CKRC6/ASA1 in auxin and cytokinin biosynthesis

Dong-Wei Di,Lei Wu,Pan Luo,Li Zhang,Tian-Zi Zhang,Xue Sun,Shao-Dong Wei,Chen-Wei An,Guang-Qin Guo 한국식물학회 2016 Journal of Plant Biology Vol.59 No.2

The crosstalk between auxin and cytokinin (CK) is important for plant growth and development, although the underlying molecular mechanisms remain unclear. Here, we describe the isolation and characterization of a mutant of Arabidopsis Cytokinin-induced Root Curling 6 (CKRC6), an allele of ANTHRANILATE SYNTHASE ALPHA SUBUNIT 1 (ASA1) that encodes the á-subunit of AS in tryptophan (Trp) biosynthesis. The ckrc6 mutant exhibits root gravitropic defects and insensitivity to both CK and the ethylene precursor 1-aminocyclopropane-1-carboxylicacid (ACC) in primary root growth. These defects can be rescued by exogenous indole-3-acetic acid (IAA) or tryptophan (Trp) supplementation. Furthermore, our results suggest that the ckrc6 mutant has decreased IAA content, differential expression patterns of auxin biosynthesis genes and CK biosynthesis isopentenyl transferase (IPT) genes in comparison to wild type. Collectively, our study shows that auxin controls CK biosynthesis based on that CK sensitivity is altered in most auxin-resistant mutants and that CKs promote auxin biosynthesis but inhibit auxin transport and response. Our results also suggest that CKRC6/ASA1 may be located at an intersection of auxin, CK and ethylene metabolism and/or signaling.

Investigation on Pharmacokinetics, Tissue Distribution and Excretion of a Novel Anticancer Platinum Compound by Inductively Coupled Plasma Mass Spectrometry after Intravenous Administration to Rats

Qing-fei Liu,Xue Li,Qiang Su,Guo-an Luo,Yi-ming Wang,Wei-ping Liu 대한약학회 2009 Archives of Pharmacal Research Vol.32 No.11

SM54111 [cis-3, 5-diisopropylsalylic cyclohexanodiaminoplatinum (Ⅱ), Saliplatin] is a novel platinum compound with encouraging anticancer effect. In order to get more useful information in multiple species for the security evaluation, dosage design, and drug delivery design, its pharmacokinetic behaviors in rats after intravenous administration were investigated in this study. Based on its pharmacokinetics in plasma, the distribution of SM54111 in heart, liver, spleen, lung, kidney, brain, adipose, testicle, or ovaries of rats sampled at 0.5 h, 1 h, and 3 h after intravenous administration were determined utilizing inductively coupled plasma mass spectrometry (ICP-MS). Its amounts in urine and feces were determined at 8 sampling times till 96 h as well. It was proved that SM54111 fitted open two-compartment model in rats, with wide distribution in tissues and slow excretion. Its reasonable pharmacokinetic properties in rats make this novel platinum compound worthy of further research and development.