An Analytical Solution for Voltage Stability Studies Incorporating Wind Power

Lin, Yu-Zhang,Shi, Li-Bao,Yao, Liang-Zhong,Ni, Yi-Xin,Qin, Shi-Yao,Wang, Rui-Ming,Zhang, Jin-Ping The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.3

Voltage stability is one of the most critical security issues which has not yet been well resolved to date. In this paper, an analytical method called PQ plane analysis with consideration of the reactive power capability of wind turbine generator and the wake effect of wind farm is proposed for voltage stability study. Two voltage stability indices based on the proposed PQ plane analysis method incorporating the uncertainties of load-increasing direction and wind generation are designed and implemented. Cases studies are conducted to investigate the impacts of wind power incorporation with different control modes. Simulation results demonstrate that the constant voltage control based on reactive power capability significantly enhances voltage stability in comparison of the conventional constant power factor control. Some meaningful conclusions are obtained.

miR-29 family inhibited the proliferation and migration of lung cancer cells by targeting SREBP-1

Lin Lin,Bao Yongxia,Tian Miao,Ren Qiu,Zhang Wei 대한독성 유전단백체 학회 2022 Molecular & cellular toxicology Vol.18 No.2

Backgrounds Lipid metabolism dysregulation is an important characteristic of tumor cells. Increased lipid metabolism provides a vital material and energy source for tumor growth, thereby promoting tumor invasion and metastasis. Objectives In the current work, we carried out a series of in vivo and in vitro studies to explore the relationship between miR-29 and lung cancer. Results The results showed that miR-29 was down-regulated in lung cancer, and overexpression of miR-29 inhibited the proliferation and migration of lung cancer cells (in vitro). Anti-lung cancer effect of miR-29 in vivo was evaluated, and results indicated that transfection of miR-29b/c markedly inhibited lung tumor growth (in vivo). We further explored the potential mechanism by which miR-29 could inhibit the cell proliferation of lung cancer. It is well known that lipid metabolism dysregulation is an important characteristic of tumor cells. Increased lipid metabolism provides a vital material and energy source for tumor growth, thereby promoting tumor invasion and metastasis, and sterol regulatory element-binding protein 1 (SREBP) is involved in liposome metabolism. Therefore, we analyzed the interaction between miR-29C and SREBP-1 in lung cancer cells. Bioinformatics analysis showed that the miR-29 has the potential binding site on SCAP and SREBP mRNA, and Luciferase reporter gene assays revealed the interaction between 3′UTR of SREBP-1 mRNA and miR-29c. Further study showed that miR-29 suppressed (SREBP-1) expression by interacting with 3′UTR of SREBP-1. Further work indicated that miR-29 transfection strongly inhibited lung cancer cell proliferation, which was rescued by the overexpression of SREBP-1. Conclusion These fi ndings demonstrate that transfection of miR-29 suppressed lung cancer proliferation via inhibiting SREBP-1 expression. The current study provides a basis for exploring the targeted agents against lung cancer.

Antioxidant Flavone Glycosides from the Root of Pteroxygonum giraldii

Bao-Lin Li,Lin-Ling Jiang,Hui-Chun Wang,Zhan-Jun Yang,Xi-Quan Zhang,Hong-Mei Gu,Xian-Hua Tian 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.7

Two new flavone glycosides, giraldiin A and B, together with three known compounds, annulatin, myricetin 3-O-α-L-rhamnopyranoside and gallic acid, were isolated from the ethanol extract of the root of Pteroxygonum giraldii Damm. et Diels. The structures of giraldiin A and B are designated as 3'-(α-L-arabinopyranosyloxy)-4',5,5',7-tetrahydroxy-3-methoxyflavone and 4'-(β-D-glucopyranosyloxy)-5,5',7-trihydroxy-2',3-dimethoxyflavone, respectively,on the basis of detailed spectroscopic analyses. The free radical scavenging activity of giraldiin A was evaluated by decolouring spectrophotometry of pentamethine cyanine dye (Cy5) with Fe2+-H2O2 Fenton radical generating system. The results indicated the hydroxyl free radical scavenging activity of giraldiin A (ED50 = 23.7 nmol/mL) is higher than that of some known antioxidants such as rutin, puerarin, daidzein and 2,6-di-tertbutyl-4-methylphenol.

Vibration Reduction for Offshore Platforms via Delayed Sliding Mode H∞ Control

Bao-Lin Zhang,Xiefu Jiang,Qiuxuan Wu,Gong-You Tang 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.1

This paper deals with delayed sliding mode H∞ control for an offshore steel jacket platform subject tononlinear self-excited wave force and external disturbance. By using both current and delayed states, a delayedsliding mode H∞ controller is designed to attenuate vibration of the offshore platform. It is observed throughsimulation results that the delayed sliding mode H∞ controller is capable of reducing the oscillation amplitudesof the offshore platform significantly. Moreover, compared with the delay-free sliding mode H∞ controller, theoscillation amplitudes of the offshore platform under the controllers are almost the same, while the control forcerequired by the delayed sliding mode H∞ controller is less than that by the delay-free sliding mode H∞ controller.

Human Recombinant Endostatin Combined with Cisplatin Based Doublets in Treating Patients with Advanced NSCLC and Evaluation by CT Perfusion Imaging

Zhang, Feng-Lin,Gao, Er-Yun,Shu, Rong-Bao,Wang, Hui,Zhang, Yan,Sun, Peng,Li, Min,Tang, Wei,Jiang, Bang-Qin,Chen, Shuang-Qi,Cui, Fang-Bo Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.15

Aims: To study the effectiveness of human recombinant endostatin injection (Endostar(R)) combined with cisplatin doublets in treating advanced non-small cell lung cancer (NSCLC), and to evaluate outcome by CT perfusion imaging. Methods: From April 2011 to September 2014, 76 patients with advanced NSCLC who were treated with platinum-based doublets were divided into group A (36 patients) and group B (40 patients). Endostar(R) 15mg/day was administered 4 days before chemotherapy and combined with chemotherapy from day 5 in group A, and combined with chemotherapy from the first day in Group B. Endostar(R) in the two groups was injected intravenously for 14 days. Results: Treatment effectiveness in the two groups differed with statistical significance (p<0.05). Effectiveness evaluated by CT perfusion imaging, BF, BV, MTT and PS also demonstrated significant differences (all p<0.05). Adverse reactions in the two groups did not significantly vary (p> 0.05). Conclusions: The response rate with Endostar(R) administered 4 days before chemotherapy and combined with chemotherapy from day 5 in group A was better than Endostar(R) combined with chemotherapy from the first day, and CT perfusion imaging could be a reasonable method for evaluation of patient outcomes.

Antioxidant Flavone Glycosides from the Root of Pteroxygonum giraldii

Li, Bao-Lin,Yang, Zhan-Jun,Jiang, Lin-Ling,Zhang, Xi-Quan,Gu, Hong-Mei,Wang, Hui-Chun,Tian, Xian-Hua Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.7

Two new flavone glycosides, giraldiin A and B, together with three known compounds, annulatin, myricetin 3-O-$\alpha$- L-rhamnopyranoside and gallic acid, were isolated from the ethanol extract of the root of Pteroxygonum giraldii Damm. et Diels. The structures of giraldiin A and B are designated as 3'-($\alpha$-L-arabinopyranosyloxy)-4',5,5',7- tetrahydroxy-3-methoxyflavone and 4'-($\beta$-D-glucopyranosyloxy)-5,5',7-trihydroxy-2',3-dimethoxyflavone, respectively, on the basis of detailed spectroscopic analyses. The free radical scavenging activity of giraldiin A was evaluated by decolouring spectrophotometry of pentamethine cyanine dye (Cy5) with $Fe^{2+}-H_2O_2$ Fenton radical generating system. The results indicated the hydroxyl free radical scavenging activity of giraldiin A (E$D_{50}$ = 23.7 nmol/mL) is higher than that of some known antioxidants such as rutin, puerarin, daidzein and 2,6-di-tertbutyl-4-methylphenol.

Bismuth-Doped Phosphate Glasses and H+-Implanted Waveguides

Jie Zhang,Jing-Yi Chen,Chun-Xiao Liu,Liao-Lin Zhang,She-Bao Lin 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.6

The work reports on the preparation and optical characterization of 75P2O5-15B2O3-9Al2O3-Bi2O3 glass by using the melt-quenching method and absorption spectroscopy, respectively. Further, 0.4-MeV proton implantation of a fluence of 8.0 × 10^{16} ions/cm^2 was carried out on this glassy sample and it was tested as a waveguide at a wavelength of 632.8 nm for the first time to our knowledge. The m-line curves of the waveguide were measured before and after successive annealing treatments. The formation theory of the planar waveguides is discussed through simulations of the energy loss distribution and analysis of the reconstructed refractive index profile. The results should be useful in the design and fabrication of bismuth-doped phosphate glass and its use in integrated photonics devices.

An Analytical Solution for Voltage Stability Studies Incorporating Wind Power

Yu-Zhang Lin,Li-Bao Shi,Liang-Zhong Yao,Yi-Xin Ni,Shi-Yao Qin,Rui-Ming Wang,Jin-Ping Zhang 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.3

Voltage stability is one of the most critical security issues which has not yet been well resolved to date. In this paper, an analytical method called PQ plane analysis with consideration of the reactive power capability of wind turbine generator and the wake effect of wind farm is proposed for voltage stability study. Two voltage stability indices based on the proposed PQ plane analysis method incorporating the uncertainties of load-increasing direction and wind generation are designed and implemented. Cases studies are conducted to investigate the impacts of wind power incorporation with different control modes. Simulation results demonstrate that the constant voltage control based on reactive power capability significantly enhances voltage stability in comparison of the conventional constant power factor control. Some meaningful conclusions are obtained.

Tube Voltage, DNA Double-Strand Breaks, and Image Quality in Coronary CT Angiography

Lin Zhu Xiao,Zhou Fan,Schoepf U. Joseph,Pillai Balakrishnan,Zhou Chang Sheng,Quan Wei,Bao Xue Qin,Lu Guang Ming,Zhang Long Jiang 대한영상의학회 2020 Korean Journal of Radiology Vol.21 No.8

Objective: To evaluate the effects of tube voltage on image quality in coronary CT angiography (CCTA), the estimated radiation dose, and DNA double-strand breaks (DSBs) in peripheral blood lymphocytes to optimize the use of CCTA in the era of low radiation doses. Materials and Methods: This study included 240 patients who were divided into 2 groups according to the DNA DSB analysis methods, i.e., immunofluorescence microscopy and flow cytometry. Each group was subdivided into 4 subgroups: those receiving CCTA only with different tube voltages of 120, 100, 80, or 70 kVp. Objective and subjective image quality was evaluated by analysis of variance. Radiation dosages were also recorded and compared. Results: There was no significant difference in demographic characteristics between the 2 groups and 4 subgroups in each group (all p > 0.05). As tube voltage decreased, both image quality and radiation dose decreased gradually and significantly. After CCTA, γ-H2AX foci and mean fluorescence intensity in the 120-, 100-, 80-, and 70-kVp groups increased by 0.14, 0.09, 0.07, and 0.06 foci per cell and 21.26, 9.13, 8.10, and 7.13 (all p < 0.05), respectively. The increase in the DNA DSB level in the 120-kVp group was higher than those in the other 3 groups (all p < 0.05), while there was no significant difference in the DSBs levels among these latter groups (all p > 0.05). Conclusion: The 100-kVp tube voltage may be optimal for CCTA when weighing DNA DSBs against the estimated radiation dose and image quality, with further reductions in tube voltage being unnecessary for CCTA.

A Base Promoted Synthesis of N,N-dimethylformamidines

Bao-Lin Li,Si Yi Ding,Yu Fei Ren,Liu Chang Wang,Yu Cai Jia,Xi-Quan Zhang,Hong-Mei Gu 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.5