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Chen, Su Huan,Song, Min,Chen, Yu Dong Techno-Press 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.21 No.2
Variations in system parameters due to uncertainties may result in system performance deterioration. Uncertainties in modeling of structures are often considered to ensure that control system is robust with respect to response errors. Hence, the uncertain concept plays an important role in vibration control of the engineering structures. The paper discusses the robustness of the stability of vibration control systems with uncertain parameters. The vibration control problem of an uncertain system is approximated by a deterministic one. The uncertain parameters are described by interval variables. The uncertain state matrix is constructed directly using system physical parameters and avoided to use bounds in Euclidean norm. The feedback gain matrix is determined based on the deterministic systems, and then it is applied to the actual uncertain systems. A method to calculate the upper and lower bounds of eigenvalues of the close-loop system with uncertain parameters is presented. The lower bounds of eigenvalues can be used to estimate the robustness of the stability the controlled system with uncertain parameters. Two numerical examples are given to illustrate the applications of the present approach.
Yu Dong Chen,Chun Yan Pei,Su Huan Chen 국제구조공학회 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.40 No.3
This paper deals with the bifurcations of non-semi-simple eigenvalues at critical point of Hopf bifurcation to understand the dynamic behavior of the system. By using the Puiseux expansion, the expression of the bifurcation of non-semi-simple eigenvalues and the corresponding topological structure in the parameter space are obtained. The zero-order approximate solutions in the vicinity of the critical points at which the multiple Hopf bifurcation may occur are developed. A numerical example, the flutter problem of an airfoil in simplified model, is given to illustrate the application of the proposed method.
Huan-Huan Gao,Nan Xu,Hao Chen,Qian Liu,Qian-Yun Pu,Dong-Yun Qin,Yi-Fan Zhai,Yi Yu 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.1
Drosophila suzukii (Diptera: Drosophilidae) is one of the very few Drosophila species which are able to lay eggs and feed on healthy ripening fruit. Adults and larvae are all able to obtain the nutrition in the decaying food, which will generate many microorganisms. However, the relationship between D. suzukii and microorganism is poorly understood. In this study, 13 species of fungi were identified in an artificial diet fed by D. suzukii. Short-term and continuously life table experiments were conducted to determine the impact of three of these fungus species including Geotrichum candidum, Talaromyces minioluteus and Actinomucor elegans on the growth and development of Drosophila suzukii. Results revealed that, compared to the control, G. candidum, T.minioluteus and A. elegans increased the mortality of D. suzukii adults in the short time, while extended the developmental time of pupal D. suzukii by 18.00%, 16.22% and 26.44%, respectively in the life table experiment. T. minioluteus reduced the total longevity of D. suzukii by 15.52%, while A. elegans enhanced the total longevity by 25.96%. G. candidum and A. elegans increased the fecundity bymore than two folds. T. minioluteus elongated the mean generation time (T) by 31.34%, whereas G. candidum shortened it by 15.26% but increased the net reproductive rate (R0) by 217.76%, intrinsic rate of increase (r) by 88.89% and finite rate of increase (λ) by 9.17%. It was concluded that G. candidumand A. elegans significantly had the beneficial effect on the growth and reproduction of D. suzukii, however, T. minioluteus had the negative effect on D. suzukii. Our results could provide a new integrated pest management strategy for D. suzukii which would be discussed in this study.
Feeding and related morphology of salivary glands of Bradysia odoriphaga (Diptera: Sciaridae)
Huan-Huan Gao,Yi-Fan Zhai,Xue Cao,Xian-Hong Zhou,Zhong-Yan Wang,Fang Wang,Hao Chen,Yi Yu 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.2
The amount of Bradysia odoriphaga larval feeding at each developmental stage and the related morphology of salivary glands were investigated in this study. The amount of daily feeding in the third instar was greatest among all the developmental stageswhile the amount of cumulative feeding in the fourth-instar accounted for 53.56% of the total amount of larval feeding. The daily amount of feeding by B. odoriphaga during the whole larval stage peaked in the 8th and 14th day after hatching. The paired and transparent salivary glands of B. odoriphaga were characterized by two distinct regions: an anterior region and a posterior region. At the fourth-instar and pupal stage, the length of salivary glands decreased significantly compared with that of the third-instar, and the integrity of epithelium cytoplasm in the salivary glands also decreased markedly because of the formation of cytoplasmic vacuoles and degradation of rough endoplasmic reticulum and mitochondria. We concluded that the decrease of daily feeding amount in the last instar was related to the structural change of salivary gland closely. The function of salivary glands in B. odoriphaga was mainly secretion of silk and cocooning-like materials during the last larval instar.
The standard deviations for eigenvalues of the closed-loop systems with random parameters
Chen, Su Huan,Liu, Chun,Chen, Yu Dong Techno-Press 2004 Structural Engineering and Mechanics, An Int'l Jou Vol.18 No.3
The vibration control problem of structures with random parameters is discussed, which is approximated by a deterministic one. A method for calculating the standard deviations of eigenvalues of the closed-loop systems is presented by using the random perturbation. The method presented in this paper will not require the distribution function of the random parameters of the systems other than their means and variances. Similarly, the distribution function of the random eigenvalues will not be computed other than their means and variances. The standard deviations of eigenvalues of the uncertain closed-loop systems can be used to estimate the stability robustness. The present method is applied to a vibration control system to illustrate the application. The numerical results show that the present method is effective.
Chen, Yu Dong,Pei, Chun Yan,Chen, Su Huan Techno-Press 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.40 No.3
This paper deals with the bifurcations of non-semi-simple eigenvalues at critical point of Hopf bifurcation to understand the dynamic behavior of the system. By using the Puiseux expansion, the expression of the bifurcation of non-semi-simple eigenvalues and the corresponding topological structure in the parameter space are obtained. The zero-order approximate solutions in the vicinity of the critical points at which the multiple Hopf bifurcation may occur are developed. A numerical example, the flutter problem of an airfoil in simplified model, is given to illustrate the application of the proposed method.
Huan-Huan Yang,Hui Zhou,Wan-Zhan Zhu,Cai-Long Chen,Guo-Chong Chen,Lu-Gang Yu,Li-qiang Qin 한국식품영양과학회 2020 Journal of medicinal food Vol.23 No.10
Dietary factors play a crucial role in the management of type 2 diabetes mellitus (T2DM) by reducing cardiovascular disease (CVD) risk. Therefore, we aimed to examine the associations between habitual green tea consumption and risk factors of CVD among T2DM patients. A total of 1013 patients with T2DM were included in a community-based cross-sectional study. Data on dietary habits, including tea consumption, were collected using a food frequency questionnaire. A multivariable logistic regression model was used to analyze the associations. In men, as compared with nongreen tea drinkers, odds ratios (ORs) (95% confidence interval [CI]) of nonalcoholic fatty liver disease (NAFLD) were 2.06 (95% CI, 1.20–3.55) for those with green tea consumption of once per day and 2.45 (95% CI, 1.31–4.58) for more than or equal to twice per day (P-trend = .004); ORs (95% CI) of general obesity were 2.19 (95% CI, 1.02–4.68) and 2.70 (95% CI, 1.18–6.21), respectively (P-trend = .021); whereas no such association was found in women. Sensitivity analysis according to self-awareness of their T2DM status revealed that the positive association between green tea consumption and general obesity was not reliable. Higher intake of green tea was still positively associated with NAFLD, but it only persisted in participants aged ≥52 years or the lower dietary quality subgroup in further analyses. Our findings suggest that tea consumption was associated with an increased risk of NAFLD among male T2DM patients aged 52 years or older, and those with lower dietary quality, which needs to be confirmed in future prospective studies.
Design procedure for modal controllers for defective and nearly defective systems
Chen, Yu Dong,Chen, Su Huan,Yang, Guang Techno-Press 2003 Structural Engineering and Mechanics, An Int'l Jou Vol.15 No.5
This paper presents a procedure for designing feedback controllers for defective systems with repeated eigenvalues, and also for a nearly defective system with close eigenvalues. For the nearly defective system, we first transform it into a defective one, and then apply the same method to deal with the nearly defective system. A method for computing the gain matrices is discussed here. The methodologies proposed are based on the modal coordinate equation to avoid the tedious mathematical manipulation. As an application of the present procedure, a numerical example is given.
( Fang Yu Cheng ),( Cheng Tang ),( Huan Yang ),( Hui Min Yu ),( Yu Chen ),( Zhong Yao Shen ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.3
Biosurfactants have versatile properties and potential industrial applications. A new producer, B. subtilis TU2, was isolated from the underground oil-extraction wastewater of Shengli Oilfield, China. Preliminary flask culture showed that the titer of biosurfactant obtained from the broth of TU2 was ~1.5 g/l at 48 h (718 mg/l after purification), with a reduced surface tension of 32.5 mN/m. The critical micelle concentration was measured as 50 mg/l and the surface tension maintained stability in solution with 50 g/l NaCl and 16 g/l CaCl2 after 5 days of incubation at 70oC. FT-IR spectra exhibited the structure information of both glycolipid and lipopeptide. MALDI-TOF-MS analyses confirmed that the biosurfactant produced by B. subtilis TU2 was a blend of glycolipid and lipopeptide, including rhamnolipid, surfactin, and fengycin. The blended biosurfactant showed 86% of oil-washing efficiency and fine emulsification activity on crude oil, suggesting its potential application in enhanced oil recovery.