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Stability analysis and stabilization for discrete-time singular delay systems

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Journal of Systems Engineering and Electronics 2011年第3期22卷 482-487页

作者： Xin sun Qingling zhang Chunyu Yang zhan su Institute of Systems Science Northeastern UniversityShenyang 110004P.R.China Key Laboratory of Integrated Automation of Process Industry Ministry of EducationNortheastern UniversityShenyang 110004P.R.China Department of Computer and Mathematics Teaching Shenyang Normal UniversityShenyang 110034P.R.China

Stability analysis and stabilization for discrete-time singular delay systems are addressed,***,a sufficient condition for regularity,causality and stability for discrete-time singular delay systems is ***,by applying the skill of matrix theory,the state feedback controller is designed to guarantee the closed-loop discrete-time singular delay systems to be regular,casual and ***,numerical examples are given to demonstrate the effectiveness of the proposed method.

关键词： discrete-time singular systems delay stability stabilization.

Fuzzy adaptive robust control for a class of uncertain nonlinear systems 36

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Fuzzy adaptive robust control for a class of uncertain nonli...

Significantly Enhanced Performance of g-C3N4/Bi2MoO6 Films for Photocatalytic Degradation of Pollutants Under Visible-light Irradiation

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作者： Haiqing Wu zhan su Jun Ai University of Shanghai for Science and Technology

ISBN: (纸本)9781538629185

In this paper,a fuzzy adaptive robust control scheme is proposed for a class of uncertain nonlinear *** the basis of the fuzzy adaptive control scheme,the H compensation control is *** adaptive parameter adjustment mainly takes into account both tracking error and approximation ***,necessary analysis is given by using the Lyapunov stability theorem,by which the converging tracking error to a neighborhood of zero is globally stable in the closed loop ***,the scheme is applied to a Duffing forced oscillation system,and simulation results confirm the effectiveness of the proposed scheme.

关键词： Adaptive Fuzzy Control Nonlinear Systems Uncertainties Robustness

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Chemical Research in Chinese Universities 2016年第2期32卷 284-290页

作者： LIU Yujun ZHOU Feng zhan su YANG Yifan YIN Yanfeng Transportation Equipment and Ocean Engineering College Dalian Maritime University Dalian 116026 P. R. China

The films of photocatalysts have been widely used in decomposition pollutants. In this study, the films were successfully prepared from Bi2MoO6 and g-C3N4/Bi2MoO6 by a simple method, respectively. The samples were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, Fourier transform infrared spectroscopy（FTIR）, photoluminescence（PL）, UV-Vis diffuse reflectance spectroscopy（DRS） and electrochemical experiments to investigate crystalline structure, morphology, composition and properties. The photocatalytic activity of the photocatalyst films for the pollutants was evaluated by degradation of methylene blue（MB） in aqueous solution under visible light irradiation. Experiments revealed that the film of g-C3Na/Bi2MoO6 exhibited higher photocatalytic ability compared to the single-component photocatalyst, and proved its stability. The superior catalytic performance can be attributed to the effective separation of electron-hole pairs and the reduced rate of recombination. This work is of great value for the preparation of photocatalysts films.

关键词： Film g-C3N4 Bi2MoO6 Photocatalyst

Pathological differential diagnosis of solid-pseudopapillary neoplasm and endocrine tumors of the pancreas

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World Journal of Gastroenterology 2010年第8期16卷 1025-1030页

作者： Liu, Bao-An Li, Zhuo-Ming su, zhan-San She, Xiao-Ling Cent S Univ Xiangya Basic Med Sch Dept Pathol Changsha 410013 Hunan Peoples R China Cent S Univ Xiangya Hosp 3 Dept Pathol Changsha 410013 Hunan Peoples R China Cent S Univ Xiangya Hosp 2 Dept Pathol Changsha 410006 Hunan Peoples R China

AIM:To investigate differential points of solid-pseudo-papillary neoplasm (SPN) of the pancreas and pancre-atic endocrine tumor (PET).METHODS:Ten cases of SPN and fourteen cases of PET were studied in this retrospective study. Clinical and pathologic features,immunostaining reactions and β-catenin gene mutations were ***:The mean age of SPN patients was 25.6 years and these patients had no specific symptoms. The mean diameter of the tumors was 11.0 cm,9/10 cases were cystic or a mixture of solid and cystic structures,and there was hemorrhage and necrosis on the cut surface in 8/10 (80%) cases. Characteristic pseudo-papillary structure and discohesive appearance of the neoplastic cells were observed in all 10 (100%) cases. The results of immunostaining showed that nuclear expression of β-catenin and loss of E-cadherin in all the cases,was only seen in SPN. Molecular studies discov-ered that 9/10 (90%) cases harbored a point mutation of exon 3 in β-catenin gene. On the other hand,the mean age of PET patients was 43.1 years. Eight of 14 cases presented with symptoms caused by hypoglyce-mia,and the other 6 cases presented with symptoms similar to those of SPN. The mean size of the tumors was 2.9 cm,most of the tumors were solid,only 3/14 (21%) were a mixture of solid and cystic structures,and macroscopic hemorrhage and necrosis were much less common (3/14,21%). Histologically,tumor cells were arranged in trabecular,acinar or solid patterns and demonstrated no pseudopapillary structure and discohesive appearance in all 14 (100%) cases. The results of immunostaining and mutation detection were completely different with SPN that membrane and cytoplastic expression of β-catenin without loss of E-cadherin,as well as no mutation in β-catenin gene in all the cases. CONCLUSION:Both macroscopic and microscopic features of SPN are quite characteristic. It is not difficult to distinguish it from PET. If necessary,immunos-taining of β-catenin and E-cadherin is quite he

关键词： Solid-pseudopapillary neoplasm of the pan-creas Pancreatic endocrine tumor Immunohistochem-istry β-catenin gene Differential diagnosis

Wandering small intestinal stromal tumor:A case report

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World Journal of Clinical Cases 2022年第29期10卷 10622-10628页

作者： Jin-zhan su Shu-Feng Fan Xia Song Lu-Jun Cao Dong-Ying su Department of Radiology The Second Affiliated Hospital of Zhejiang Chinese Medical UniversityHangzhou 310005Zhejiang ProvinceChina Department of Radiology The Hospital of the Zhejiang UniversityHangzhou 310058Zhejiang ProvinceChina

BACKGROUND The occurrence of gastrointestinal stromal tumors(GISTs)in the small intestine is rare,and a case of wandering small intestinal stromal tumor has been rarely reported to *** of this case can help inform future diagnosis and effective *** suMMARY A 68-year-old patient presented to us with tarry *** tomography showed a mobile tumor moving widely within the abdominal *** the laboratory data showed a low range of red blood cells and an immediate surgery was not indicated,we performed digital subtraction angiography and embolization to achieve *** resection was performed after the patient’s condition *** tumor was successfully removed *** examination revealed submucosal GIST with infarction,which was of intermediate-risk,with mitotic countsualized at its original location,the possibility of tumor migration is considered.

关键词： Wandering tumor Gastrointestinal stromal tumors Small intestine Melena Gastrointestinal hemorrhage Case report

Research and design of wap service system based on MISC platform

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The Journal of China Universities of Posts and Telecommunications 2006年第4期13卷 34-38页

作者： YU Oun SONG Mei-na SONG Jun-de zhan Xiao-su PCN and CAD Center Beijing University of Posts and Telecommunications Beijing 100876 China

Wireless application protocol （WAP） have become the available method for subscribers to access mobile Internet through mobile terminal, regardless of the location and time. In this article, a logical architecture of WAP service system based on mobile information service centre （MISC） [1, 2] platform is discussed. The whole system is designed and developed on Java 2 enterprise edition [3] （J2EE） architecture and deployed on BEA WebLogic Server [3, 4]. Furthermore, a series of various WAP services based on this system have been implemented, which validates the practice value of this system. This optimal scheme presented in this article will reduce the development complexity, deployment risk, and so on.

关键词： WAP MISC J2EE WAP Engine MBlog

CHEBYSHEV FINITE SPECTRAL METHOD FOR 2-D EXTENDED BOUSSINESQ EQUATIONS

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Journal of Hydrodynamics 2011年第1期23卷 1-11页

作者： LI Yok-sheung zhan Jie-min, su Wei Department of Civil and Structural Engineering The Hong Kong Polytechnic University Hong Kong China Department of Applied Mechanics and Engineering Sun Yat-sen University Guangzhou 510275 China

In this article,an accurate Chebyshev finite spectral method for the 2-D extended Boussinesq equations is *** method combines the advantages of both the finite difference and spectral *** Adams-Bashforth predictor and the fourth-order Adams-Moulton corrector are adopted for the numerical solution of the governing differential *** efficient wave absorption strategy is also proposed to effectively absorb waves at outgoing wave boundaries and reflected waves from the interior of the computational domain due to barriers and bottom slopes at the incident wave boundary to avoid contamination of the specified incident wave *** proposed method is verified by a case where experimental data are available for comparison for both regular and irregular *** case is wave diffraction over a shoal reported by Vincent and *** results agree very well with the corresponding experimental data.

关键词： Chebyshev polynomial finite spectral method irregular waves

Ursolic acid inhibits proliferation and induces apoptosis of HT-29 colon cancer cells by inhibiting the EGFR/MAPK pathway

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2009年第9期10卷 668-674页

作者： Jian-zhen SHAN Yan-yan XUAN Shu ZHENG Qi DONG su-zhan zhanG Department of Traditional Chinese Medicine the Second Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310009 China Cancer Institute School of Medicine Zhejiang University Hangzhou 310009 China

Objective： To investigate the effects ofursolic acid on the proliferation and apoptosis of human HT-29 colon cancer cells. Methods： 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyltetrazolium bromide （MTT） and flow cytometry assays were performed to evaluate the effects of ursolic acid on the growth and apoptosis of HT-29 cells. Western blot analysis was applied to investigate the inhibitory efibcts of ursolic acid on the phosphorylation of the epidermal growth factor receptor （EGFR）, extracellular signal-regulated kinase （ERK）, c-Jun N-terminal kinase （JNK）, and p38 mitogen-activated protein kinase （p38 MAPK）, and the activity of B cell leukemia-2 （Bcl-2）, B cell leukemia-xL （Bcl-xL）, caspase-3, and caspase-9. Results： Ursolic acid inhibited the growth of HT-29 cells in dose- and time-dependent manners. The median inhibition concentration （IC50） values for 24, 48, and 72 h treatment were 26, 20, and 18 pmol/L, respectively. The apoptotic rates of 10, 20, and 40 μmol/L ursolic acid treatments for 24 h were 5.74%, 14.49%, and 33.05%, and for 48 h were 9%, 21.39%, and 40.49%, respectively. Ursolic acid suppressed the phosphorylation of EGFR, ERK1/2, p38 MAPK, and JNK, which is well correlated with its growth inhibitory effect. 10, 20, and 40 μmol/L ursolic acid significantly inhibited the proliferation of EGF-stimulated HT-29 cells （P〈0.05）. Cell proliferation was most significantly inhibited when treated with 10 and 20 μmol/L ursolic acid combined with 200 nmol/L AG 1478 or 10 μmol/L U0126 （P〈0.01）. Besides, it also down-regulated the expression of Bcl-2 and Bcl-xL and activated caspase-3 and caspase-9. Conclusion： Ursolic acid induces apoptosis in HT-29 cells by suppressing the EGFR/MAPK pathway, suggesting that it may be a potent agent for the treatment of colorectal cancer.

关键词： Colon cancer Ursolic acid Epidermal growth factor receptor (EGFR) Mitogen-activated protein kinase (MAPK) Apoptosis

Influence of(Mg_(1/3)Nb_(2/3))complex substitutions on crystal structures and microwave dielectric properties of Li2TiO3 ceramics with extreme low loss

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Journal of Materiomics 2018年第4期4卷 368-382页

作者： Huan-Huan Guo Di Zhou Li-Xia Pang Jin-zhan su Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric ResearchSchool of Electronic and Information EngineeringXi'an Jiaotong UniversityXi'an710049China Micro-optoelectronic Systems Laboratories Xi'an Technological UniversityXi'an710032ShaanxiChina International Research Centre for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityXi'anShaanxi710049China

A systematic investigation of the Li2Ti1-x(Mg_(1/3)Nb_(2/3))xO_(3)(0.1≤x≤0.35)solid solutions synthesized by traditional solid-state reaction method is reported in this *** the composition range of 0.1≤x≤0.25,a monoclinic rock salt structured solid solution was *** x increased to 0.3,a phase transition from monoclinic to cubic phase,along with an order-disorder phase transition,was *** x increased from 0.1 to 0.35,the microwave permittivity(εr)and temperature coefficient of resonant frequency(TCF)of the Li2Ti1-x(Mg_(1/3)Nb_(2/3))xO_(3)ceramics decreased linearly from 21.0 to 18.6,+27.1 to-19.4 ppm/℃,*** Li_(2)Ti_(0.75)(Mg_(1/3)Nb_(2/3))0.25O_(3)ceramic sintered at 1170℃shows high performance of microwave dielectric properties with aεr~19.6,a Qf(Q=quality factor=1/dielectric loss;f=resonant frequency)~109,770 GHz(at 7.7 GHz)and a near zero TCF~t 1.2 ppm/℃.Moreover,the burying sintering process can reduce the volatilization of lithium so that the porosity of Li_(2)Ti_(0.75)(Mg_(1/3)Nb_(2/3))0.25O_(3)ceramic was reduced effectively,which made Li_(2)Ti_(0.75)(Mg_(1/3)Nb_(2/3))0.25O_(3)ceramic promising for future *** area electron diffraction patterns,high-resolution transmission electron microscopy,Raman and far-infrared spectra were employed to study the relation between crystal structure and microwave dielectric properties in detail.

关键词： Microwave dielectric properties Phase evolution Crystal structure High quality