Frequency Response Analysis on Modified Plant of Extended State Observer

Yuqiong Zhang,Yali Xue,Donghai Li,Zhiqiang Gao,Haiming Niu,Huanpao Huang 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10

The active disturbance rejection control (ADRC) framework gives birth to a new concept, the modified plant (MP), describing the dynamics after the total disturbance is estimated and cancelled approximately. Ideally the modified plant is in integral form, to greatly simplify and fix the controller design, even though actual plant contains higher-order dynamics or dead time. This paper investigates that when such processes are modified into the integral, how the parameters of the extended state observer (ESO) impact on the dynamic characteristics and stability of the MP. Frequency-domain analyses show that the MP can gradually approach the integral form through parameters tuning. However, it should be cautious that an aggressive set of parameters may lead to an unstable modified plant in the presence of order mismatch.

Active Disturbance Rejection Control For Circulating Fluidized Bed Boiler

Yuqiong Zhang,Donghai Li,Yali Xue 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10

The Circulating Fluidized Bed Boiler (CFBB) is a multivariable coupled, long time-delay, large inertia system. In this paper, a decentralized control system using active disturbance rejection control (ADRC) strategy is proposed for a nonlinear CFBB model. The designed control system has a fully decentralized structure and it is free of complex decouplers, which is difficult to achieve in actual plants. With ADRC method, the interaction of two control loops, the higher orders, uncertainties and unmodeled dynamics are treated as general disturbance, which is estimated by Extended State Observer (ESO) and then actively compensated. Some simulation results illustrate that the designed control system has good performance when the power set point is varied in a wide range and a disturbance of the set point of main steam pressure is added into the CFBB system. Besides, the same parameters are adequate on varied operating points, indicating the strong robustness of the controller. The proposed decentralized control system has advantage in easy tuning procedure, simple structure and its disturbance-rejection capability.

Electrochemical inactivation of coliforms by in-situ generated hydroxyl radicals

Zucheng Wu,Yanqing Cong,Yuqiong Li 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.4

Electrochemical disinfection is quite attractive as a promising alternative technology to chlorination. It is still debated whether conventional electrochemical disinfection, which electrolyzes the solution with very high chloride concentration to produce excess amounts of chlorine species, will generate toxic disinfection byproducts (DBPs) and have the same health risks as chlorination. To resolve this critical issue, we explored the possibility of electrochemical disinfection based on electrogenerated free radicals but not on active chlorine. The germicidal efficiency of 99.99% was achieved with a contact time of 5 min and current density of 7 mA cm−2 for a chloride-free model wastewater contaminated by coliforms. Electron spin resonance detection clearly confirmed that hydroxyl radicals were the major germicidal species responsible for efficient electrochemical disinfection. This process would not generate poisonous DBPs due to the avoidance of dangerous chlorine species. pH in the range of 5-9 has little effect on the bacteria inactivation. Formation mechanism of hydroxyl radicals was discussed

Reforms on county-level fiscal governance in China: impact on urban-rural income inequality

Xuhong Su,Kelan Lua,Xiangming Hu,Yuqiong Xiang 한국행정학회 2019 International Review of Public Administration Vol.24 No.2

The latest fiscal reforms in China have been on the county level and bundled both fiscal decentralization and fiscal spending. The present study investigates whether such bundled fiscal reforms affected one important social dimension: urban-rural income inequality. Using quasi-experimental data, the study shows that fiscal decentralization benefited only urban residents and that fiscal spending promoted income growth for both urban and rural residents, though growth velocity slowed down over time. Together, the bundled fiscal reforms saw disparate impact on urban and rural residents, with positive effects on rural income growth and negative on urban peers. The latest fiscal reforms did not enlarge urban-rural income inequality and even slowed down their growth velocity. The impact of fiscal reforms has been largely embedded into extant urban-biased institutions and questions the possible limits of state-led development policies. This study concludes by discussing policy and theoretical implications of research findings.

Active Disturbance Rejection Control of Shell Gasifier in IGCC Power Plants

Chen Shihe,Luo Jia,Wu Le,Zhang Yuqiong,Li Donghai,Xue Yali 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.6

Adiponectin induced AMP-activated protein kinase impairment mediates insulin resistance in Bama mini-pig fed high-fat and high-sucrose diet

Miaomiao Niu,Lei Xiang,Yaqian Liu,Yuqiong Zhao,Jifang Yuan,Xin Dai,Hua Chen 아세아·태평양축산학회 2017 Animal Bioscience Vol.30 No.8

Objective: Adipose tissue is no longer considered as an inert storage organ for lipid, but instead is thought to play an active role in regulating insulin effects via secretion adipokines. However, conflicting reports have emerged regarding the effects of adipokines. In this study, we investigated the role of adipokines in glucose metabolism and insulin sensitivity in obese Bama mini-pigs. Methods: An obesity model was established in Bama mini-pigs, by feeding with high-fat and high-sucrose diet for 30 weeks. Plasma glucose and blood biochemistry levels were measured, and intravenous glucose tolerance test was performed. Adipokines, including adiponectin, interleukin-6 (IL-6), resistin and tumor necrosis factor alpha (TNF-α), and glucose-induced insulin secretion were also examined by radioimmunoassay. AMP-activated protein kinase (AMPK) phosphorylation in skeletal muscle, which is a useful insulin resistance marker, was examined by immunoblotting. Additionally, associations of AMPK phosphorylation with plasma adipokines and homeostasis model assessment of insulin resistance (HOMA-IR) index were assessed by Pearce's correlation analysis. Results: Obese pigs showed hyperglycemia, high triglycerides, and insulin resistance. Adiponectin levels were significantly decreased (p<0.05) and IL-6 amounts dramatically increased (p<0.05) in obese pigs both in serum and adipose tissue, corroborating data from obese mice and humans. However, circulating resistin and TNF-α showed no difference, while the values of TNF-α in adipose tissue were significantly higher in obese pigs, also in agreement with data from obese humans but not rodent models. Moreover, strong associations of skeletal muscle AMPK phosphorylation with plasma adiponectin and HOMA-IR index were obtained. Conclusion: AMPK impairment induced by adiponectin decrease mediates insulin resistance in high-fat and high-sucrose diet induction. In addition, Bama mini-pig has the possibility of a conformable model for human metabolic diseases.

Development of a 120 Hz 110 ultra-high-definition a-Si liquid crystal display panel

Yanping Liao,Xibin Shao,Yufan Du,송용지,Weihao Hu,Zhenyu Zhang,Yuqiong Chen,Ying Wang,Qing Ma,윤대근,Dan Wang,Jianfeng Yuan,Hongjiang Wu,Zongjie Guo,Zhaohui Hao,Ji Zhang,Jing Lv 한국정보디스플레이학회 2014 Journal of information display Vol.15 No.2

A prototype 120 Hz 110-inch ultra-high-definition a-Si liquid crystal display (LCD) panel was successfully developed using the BOE exclusive advanced superdimensional switching technology. This LCD has a panel consisting of 3840 × 2160 pixels, four times the number of pixels in the conventional full-high-definition LCD. For the brightness and contrast ratio, 1000 nits and 1200:1 have been achieved, respectively. Additionally, the liquid crystal charging time has been extended through quad area driving and 2G2D line structures. Furthermore, the local dimming and mirror-scanning techniques are applied to realize excellent image display. Finally, the system utilizes 3D shutter glasses, allowing the viewer to achieve the highest sense of realness and immersion.

Nutrigenomics reveals potential genetic underpinning of diverse taste preference of Chinese men

Zhouhai Zhu,Junpu Mei,Silong Sun,Sheming Lu,Meng Li,Ying Guan,Ying Chen,Yuqiong Xu,Tao Zhang,Fengxue Shi,Xuemei Li,Mingming Miao,Shancen Zhao,Qian Gao,Qili Mi,Ping Tang,Jianhua Yao 한국유전학회 2021 Genes & Genomics Vol.43 No.6

Background Taste preference varies geographically in China. However, studies on Chinese people’s taste preference in different regions of China are limited, and are lack of research on the mechanism of diferences in taste preference, especially in genetics. Objective This study aims to investigate the characteristics of taste preference of Chinese men, and estimate whether diverse taste preference in Chinese have genetic underpinning. Methods We conducted a questionnaire survey on taste preferences on 1076 males from 10 regions of China, and collected another 1427 males from the same regions which genotyped by microarray. We compared the correlation between diferent taste preference, and evaluated the correlation between the mutation frequency of inhouse database and diferent taste preference. The putative taste-preference-related genes were further utilized to estimate the candidate relationship on gene and gene network in diferent taste preference. Results There was a correlation between diferent taste preferences in Chinese men. We found 31 SNPs associated with 6 kind of taste preferences. These SNPs located within or nearby 36 genes, and the tastes associated with 4 of these genes (TRPV1, AGT, ASIC2 and GLP1R) are consistent with the previous studies. Moreover, in diferent tastes which were suggested to be associated with each other, some putative related genes were the same or in the same gene network, such as pathways related with blood pressure, response to stimulus and nervous system. Conclusions This study indicates that the diverse taste preference of Chinese men may have genetic underpinning.

Effects of pulsed laser surface remelting on microstructure, hardness and lead-bismuth corrosion behavior of a ferrite/martensitic steel

Hao Wang,Qian Yuan,Linjiang Chai,Ke Zhao,Ning Guo,Jun Xiao,Xing Yin,Bin Tang,Yuqiong Li,Shaoyu Qiu 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.6

A typical ferritic/martensitic (F/M) steel sheet was subjected to pulsed laser surface remelting (LSR) andcorrosion test in lead-bismuth eutectic (LBE) at 550 C. There present two modification zones withdistinct microstructures in the LSRed specimen: (1) remelted zone (RZ) consisting of both bulk d-ferritegrains and martensitic plates and (2) heat-affected zone (HAZ) below the RZ, mainly composed ofmartensitic plates and high-density precipitates. Martensitic transformation occurs in both the RZ andthe HAZ with the Kurdjumov-Sachs and Nishiyama-Wassermann orientation relationships followedconcurrently, resulting in scattered orientations and specific misorientation characteristics. Hardnessesof the RZ and the HAZ are 364 ± 7 HV and 451 ± 15 HV, respectively, considerably higher than that of thematrix (267 ± 3 HV). In oxygen-saturated and oxygen-depleted LBE, thicknesses of oxide layers developed on both the as-received and the LSRed specimens increase with prolonging corrosion time (oxidelayers always thinner under the oxygen-depleted condition). The corrosion resistance of the LSRed F/Msteel in oxygen-saturated LBE is improved, which can be attributed to the grain-refinement acceleratedformation of dense FeeCr spinel. In oxygen-depleted LBE, the growth of oxide layers is very low withboth types of specimens showing similar corrosion resistance