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Preparation and characterization of polystyrene-based monolith with ordered macroporous structure

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Chinese Chemical Letters 2012年第4期23卷 474-477页

作者： Quan Zhou Wu Jian Feng He Ji Ming Ou College of Chinese Materia Medica Guangzhou University of Chinese MedicineGuangzhou 510006China

In this paper,polystyrene-based monoliths with highly ordered macroporous structure were synthesized by using SiO_2 colloidal crystal as *** observation shows that the macropores are highly ordered and are interconnected by small *** BET surface area of PS monolith is about 36.17 m^2/*** polymer monoliths can resist 5 MPa pressure,showing high mechanical and compressive strength.

关键词： Monolith Polystyrene Polymer Ordered macropore

ROBUST EXPONENTIAL STABILITY OF SWITCHED DELAY INTERCONNECTED SYSTEMS UNDER ARBITRARY SWITCHING

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Acta Mathematica Scientia 2018年第6期38卷 1921-1938页

作者： Huanbin XUE Jiye ZHANC College of Mathematics and Statistics Hanshan Normal University State Key Laboratory of Traction Power Southwest Jiaotong University

The problem of robust exponential stability for a class of switched nonlineardynamical systems with uncertainties and unbounded delay is addressed. On the assump-tion that the interconnected functions of the studied systems satisfy the Lipschitz condition,by resorting to vector Lyapunov approach and M-matrix theory, the sufficient conditions toensure the robust exponential stability of the switched interconnected systems under arbi-trary switching are obtained. The proposed method, which neither require the individualsubsystems to share a Common Lyapunov Function （CLF）, nor need to involve the values ofindividual Lyapunov functions at each switching time, provide a new way of thinking to studythe stability of arbitrary switching. In addition, the proposed criteria are explicit, and it isconvenient for practical applications. Finally, two numerical examples are given to illustratethe correctness and effectiveness of the proposed theories.

关键词： interconnected systems robust stability switching rule unbounded delay

A novel mixed-synchronization phenomenon in coupled Chua's circuits via non-fragile linear control

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Chinese Physics B 2011年第8期20卷 113-119页

作者：王军威马庆华曾丽 Cisco School of Informatics Guangdong University of Foreign Studies

Dynamical variables of coupled nonlinear oscillators can exhibit different synchronization patterns depending on the designed coupling scheme. In this paper, a non-fragile linear feedback control strategy with multiplicative controller gain uncertainties is proposed for realizing the mixed-synchronization of Chua＇s circuits connected in a drive-response configuration. In particular, in the mixed-synchronization regime, different state variables of the response system can evolve into complete synchronization, anti-synchronization and even amplitude death simultaneously with the drive variables for an appropriate choice of scaling matrix. Using Lyapunov stability theory, we derive some sufficient criteria for achieving global mixed-synchronization. It is shown that the desired non-fragile state feedback controller can be constructed by solving a set of linear matrix inequalities （LMIs）. Numerical simulations are also provided to demonstrate the effectiveness of the proposed control approach.

关键词： mix-synchronization Chua's circuit non-fragile control Lyapunov stability linear ma-trix inequality

Gap solitons in parity time complex superlattice with dual periods

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Chinese Physics B 2014年第6期23卷 246-251页

作者：王红成凌东雄张绍强朱兴何影记 College of Electronic Engineering Dongguan University of Technology State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen University School of Electronics and Information Guangdong Polytechnic Normal University

A theory is presented to investigate the existence and propagation stability of gap solitons in a parity-time （PT） com- plex superlattice with dual periods. In this superlattice, the real and imaginary parts are both in the form of superlattices with dual periods. In the self-focusing nonlinearity, PT solitons can exist in the semi-infinite gap. However, only those gap solitons with low powers can propagate stably, whereas the high-power solitons present periodic oscillation and simultane- ously suffer energy decay. In the self-defocusing nonlinearity, PT solitons only exist in the first gap and all these solitons are stable.

关键词： spatial soliton parity-time soliton gap soliton superlattice

ON ORDER AND TYPE OF MULTIPLE DIRICHLET SERIES

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Acta Mathematica Scientia 2015年第3期35卷 703-708页

作者：梁美丽 School of Finance Guangdong University of Foreign Studies

This article investigates the growth of multiple Dirichlet series. The order and the type of n-tuple Dirichlet series in Cn are defined and some relations between them and the coefficients and exponents of n-tuple Dir... 详细信息

关键词： Multiple Dirichlet series order type

Preparation and Photocatalytic Application of High Temperature Stabilized ZrSiO_4@TiO_2 Hybrid Nanostructure

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Journal of Wuhan University of Technology(Materials Science) 2014年第4期29卷 643-646页

作者：彭诚 FANG Peiyu ZENG Zhichao Lü Ming 吴建青 School of Materials Science and Engineering South China University of Technology

A new ZrSiO4@TiO2 hybrid nanostructure was prepared by a heterogeneous flocculation method. Phytic acid was introduced to modify the surface charging of the components for hybrid assembly. The obtained powder was coated on ceramic tiles and fired at 900 ℃ to fabricate photocatalytic ceramic. Experimental results show that anatase TiO2 in the composite powder has high thermal stability until 1 200 ℃. ZrSiO4 matrix prevents the mass transfer of anatase TiO2 at high temperature and greatly retards the phase transition of anatase to rutile. Besides, the photocatalytic ceramic shows apparent activities for the degradation of methyl orange under ultra-violet irradiation.

关键词： preparation photocatalytic application ZrSiO4 anatase phytic acid

GENERAL ALGEBROID FUNCTION AND ITS APPLICATION

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Acta Mathematica Scientia 2016年第1期36卷 283-294页

作者：孙道椿霍颖莹张晓梅 School of Mathematics South China Normal University School of Applied Mathematics Guangdong University of Technology Department of Basic Courses Guangzhou Maritime Institute

In this paper, the authors introduce a kind of reducible algebroid functions, that is general algebroid functions and obtain two fundamental theorems of general algebroid functions. At last, as an application, we gene... 详细信息

关键词： general algebroid function the branch point theorem the first fundamentaltheorem the second fundamental theorem

Slamming and Green Water Loads on Bow-Flare Ship in Regular Head Waves Investigated by Hydroelasticity Theory and Experiment

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Journal of Shanghai Jiaotong university(Science) 2019年第5期24卷 559-570页

作者： JIAO Jialong ZHAO Yulin CHEN Chaohe LI Xiaochen School of Civil Engineering and Transportation South China University of Technology

With the development of ships towards large scale, high speed and light weight, ship hydroelastic responses and slamming strength issues are becoming increasingly important. In this paper, a time-domain nonlinear hydroelasticity theory is developed to predict ship motion and load responses in harsh regular *** restoring force, wave excitation force and radiation force are calculated on the instantaneously wetted body surface to consider the nonlinear effects caused by large amplitude motions of ship in steep waves. A twodimensional(2 D) generalized Wagner model and a one-dimensional(1 D) dam-breaking model are used to estimate the impact loads caused by bow flare slamming and green water on deck, respectively;the impact loads are coupled with the hydroelastic equation in time-domain. Moreover, segmented model tests are carried out in a towing tank to investigate the wave and slamming loads acting on the hull sailing in harsh regular head waves and also validate the numerical results.

关键词： hydroelasticity theory wave load slamming load green water on deck segmented model test

Recent advances in organic,inorganic,and hybrid thermoelectric aerogels

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Chinese Physics B 2022年第2期31卷 14-21页

作者： Lirong Liang Xiaodong Wang Zhuoxin Liu Guoxing Sun Guangming Chen Joint Key Laboratory of the Ministry of education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipaSARMacaoChina College of Materials Science and Engineering Shenzhen UniversityShenzhen 518055China

The thermoelectric(TE)materials and corresponding TE devices can achieve direct heat-to-electricity conversion,thus have wide applications in heat energy harvesting(power generator),wearable electronics and local *** recent years,aerogel-based TE materials have received considerable attention and have made remarkable progress because of their unique structural,electrical and thermal *** this review,the recent progress in both organic,inorganic,and composite/hybrid TE aerogels is systematically summarized,including the main constituents,preparation method,TE performance,as well as factors affecting the TE performance and the corresponding ***,two typical aerogel-based TE devices/generators are compared and analyzed in terms of assembly modes and output ***,the present challenges and some tentative suggestions for future research prospects are provided in conclusion.

关键词： thermoelectric materials thermoelectric device aerogel thermoelectric performance