Adaptive Neural Dynamic Surface Control for a General Class of Stochastic Nonlinear Systems with Time Delays and Input Dead-zone

Wen-Jie Si,Xun-De Dong,Fei-Fei Yang 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.5

This paper investigates adaptive tracking control for a more general class of stochastic nonlinear timedelaysystems with unknown input dead-zone. For the considered system, the drift and diffusion terms containtime-delay state variables. In control design, Lyapunov-Krasovskii functionals are employed to handle unknowntime-delay terms. Then, unknown nonlinear functions are approximated by RBF neural networks, and the dynamicsurface control (DSC) technique is utilized to avoid the problem of explosion of complexity. At last, based onthe Lyapunov stability theory, a robust adaptive controller is designed to guarantee that all closed-loop signals arebounded in probability and the tracking error converges to a small neighborhood of the origin. The simulationexample is presented to further show the effectiveness of the proposed approach.

Study on the Purification of Polysaccharides from Noscoc flagelliforme with Radial Flow Chromatography

Yu-Jie Dai,Jing-Wen Wang,Shi-Ru Jia,Si-Jun Yue,Meng-Yao Jia,Peng Xu 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.3

The isolation and purification of polysaccharide from Noscoc flagelliforme by radial flow chromatography were studied. The column (7.7 cm of bed length and 229.6 cm³ of bed volume) was packed with DEAE-01 anion ion-exchange resin and gradient eluted with NaCl solutions. The content of the polysaccharide was determined with the phenol-sulfuric acid method. The effects of sampling weight, elution velocity, and elution concentration gradient on the separation efficiency were examined and three isolated peaks were obtained. The optimal separation conditions are 10 mg of the sampling weight (sampling volume is 20 mL), 1.0 mL/min of the elution velocity, and 1.00 mol/L² of NaCl gradient elution. The adjacent peak resolutions among the three main components (1, 2, and 3 according to their elution order) are 0.660 (o12) and 0.786 (o23), respectively. It is deduced that 39.8 cm of the bed length is required for the fully separation of the three polysaccharides The isolation and purification of polysaccharide from Noscoc flagelliforme by radial flow chromatography were studied. The column (7.7 cm of bed length and 229.6 cm³ of bed volume) was packed with DEAE-01 anion ion-exchange resin and gradient eluted with NaCl solutions. The content of the polysaccharide was determined with the phenol-sulfuric acid method. The effects of sampling weight, elution velocity, and elution concentration gradient on the separation efficiency were examined and three isolated peaks were obtained. The optimal separation conditions are 10 mg of the sampling weight (sampling volume is 20 mL), 1.0 mL/min of the elution velocity, and 1.00 mol/L² of NaCl gradient elution. The adjacent peak resolutions among the three main components (1, 2, and 3 according to their elution order) are 0.660 (o12) and 0.786 (o23), respectively. It is deduced that 39.8 cm of the bed length is required for the fully separation of the three polysaccharides

Prevalence, Risk Factors, and Psychological Effects of Overactive Bladder in Chinese University Students

Yu Liang,Guo Wei Si,Hui Jie Hu,Zhen Wei Zhang,Cui Ping Song,Qi Feng Dou,Jian Guo Wen 대한배뇨장애요실금학회 2022 International Neurourology Journal Vol.26 No.4

Purpose: The purpose of this study was to investigate the prevalence and risk factors of overactive bladder (OAB) in young adults and to explore the influence of OAB on mental health. Methods: Between October 2019 and January 2020, 14,010 anonymous questionnaires were distributed to freshmen at 2 universities in Henan, China. The students came from all over the country. The questionnaire included general items and information necessary to calculate the overactive bladder symptom score, the Chinese version of the Pittsburgh Sleep Quality Index (PSQI) score, Self-Esteem Scale (SES) score, and Self-Rating Depression Scale (SDS) score. The relationships between the prevalence of OAB and its risk factors were evaluated. Results: The overall prevalence of OAB was 6.0%, with 4.3% of participants characterized as having dry OAB and 1.7% as having wet OAB. The prevalence of mild OAB was 5.5%, and that of moderate OAB was 0.5%; no severe OAB was observed. Higher prevalence rates of OAB were found among women, respondents with constipation, and respondents with primary nocturnal enuresis (PNE) (P <0.05). Compared to healthy controls, the OAB group exhibited a higher mean SDS score (52.12±8.986 vs. 47.71±9.399, P<0.001) and mean PSQI score (5.28±2.486 vs. 4.27±2.431, P<0.001), but a lower mean SES score (27.78±3.599 vs. 29.57±4.109, P<0.001). Conclusions: OAB significantly affects the mental health of young adults. Female sex, constipation, and PNE are risk factors for OAB.

Study on Joint Simulation of Very Fast Transient Overvoltage and Transient Enclosure Voltage in 1000 kV GIS

Zhang Yan-Ze,Chen Xiao-Yue,Si Jun-Jie,He Ze-Yu,Wen Xi-Shan 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5

Disconnector operation in GIS generates VFTO and TEV, which threaten device insulation and personnel safety. In order to calculate VFTO and TEV more accurately, this paper proposes a VFTO-TEV joint simulation model. Among them, dynamic arc model is used to reflect the dynamic characteristics of high frequency AC arc. In order to reflect the electromagnetic leakage phenomenon caused by the impedance mismatch of high-frequency electromagnetic waves, and the influence of the transient potential difference formed by the transient electromagnetic field on grounding grid on TEV, the geometric structures of high-voltage bushing, grounding pillars and grounding grid are modeled to obtain their respective frequency-dependent admittance matrices, which are converted into corresponding broadband equivalent circuit models by combining vector fitting method and impedance synthesis method. The above modeling method is applied to the 1000 kV GIS test circuit, and the simulation model is built in the ATP-EMTP electromagnetic transient program, and the joint simulation research of VFTO and TEV is carried out. The results show that at each measurement point of the test circuit, the amplitude error of the VFTO obtained by simulation and actual measurement is mostly less than 7%, and the frequency spectrum both contains the main frequency components of 18 MHz and 25 MHz; Compared with the traditional calculation model of obtaining VFTO/TEV using CIGRE model/Petersen's law, the amplitude of VFTO and TEV obtained by joint simulation model is lower and contains richer high-frequency components. In addition, the opening speed of 0.8 m/s also corresponds to the maximum point of the VFTO amplitude of the test circuit. Finally, based on the above modeling method, the effectiveness of adding ferrite beads to suppress VFTO is verified by simulation. © 2017 Elsevier Inc. All rights reserved.

<i>Sinomicrobium oceani</i> gen. nov., sp. nov., a member of the family <i>Flavobacteriaceae</i> isolated from marine sediment

Xu, Ying,Tian, Xin-Peng,Liu, Yu-Juan,Li, Jie,Kim, Chang-Jin,Yin, Hao,Li, Wen-Jun,Zhang, Si International Union of Microbiological Societies 2013 International journal of systematic and evolutiona Vol.63 No.3

<P>A marine bacterium, designated SCSIO 03483<SUP>T</SUP>, was isolated from a marine sediment sample collected from the Nansha Islands in the South China Sea. The strain produced roundish colonies with diffusible yellow-coloured pigment on nutrient agar medium or marine agar 2216. Optimal growth occurred in the presence of 0–4 % (w/v) NaCl, at pH 7.0 and a temperature range of 28–37 °C. 16S rRNA gene sequence analysis indicated that the isolate belonged to the family <I>Flavobacteriaceae</I> and showed relatively high sequence similarity with <I>Imtechella halotolerans</I> K1<SUP>T</SUP> (92.7 %). Phylogenetic analysis based on nearly complete 16S rRNA gene sequences revealed that the isolate shared a lineage with members of the genera <I>Imtechella</I>, <I>Joostella</I> and <I>Zhouia</I>. Phospholipids were phosphatidylethanolamine, two unidentified aminolipids and three unknown polar lipids. The major respiratory quinone was MK-6 and the major fatty acids were iso-C<SUB>15 : 0</SUB>, iso-C<SUB>17 : 0</SUB> 3-OH and summed feature 3 (C<SUB>16 : 1</SUB>ω6<I>c</I>/C<SUB>16 : 1</SUB>ω7<I>c</I>). The DNA G+C content of strain SCSIO 03483<SUP>T</SUP> was 38.4 mol%. On the basis of phenotypic, chemotaxonomic and molecular data, strain SCSIO 03483<SUP>T</SUP> represents a novel species in a new genus in the family <I>Flavobacteriaceae</I>, for which the name <I>Sinomicrobium oceani</I> gen. nov., sp. nov. is proposed. The type strain of <I>Sinobacterium oceani</I> is SCSIO 03483<SUP>T</SUP> ( = KCTC 23994<SUP>T</SUP> = CGMCC 1.12145<SUP>T</SUP>).</P>