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Boundary conditions for the bending of a piezoelectric beam

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Science china(Physics,Mechanics & Astronomy) 2008年第7期51卷 847-856页

作者： GAO Yang1, XU SiPeng2 & ZHAO BaoSheng3 1 college of Science, china Agricultural university, Beijing 100083, china 2 college of engineering, ocean university of china, qingdao 266071, china 3 School of Mechanical engineering, university of Science and Technology Liaoning, Anshan 114044, china college of Science China Agricultural University Beijing China college of engineering Ocean University of China Qingdao China School of Mechanical engineering University of Science and Technology Liaoning Anshan China

For beam bending in transversely isotropic piezoelectric media, the reciprocal theorem and the general solution of piezoelasticity are applied in a novel way to obtain the appropriate stress and mixed boundary conditions accurate to all orders for the beam of general edge geometry and loadings. By generalizing the method developed by Gregory and Wan, a set of necessary conditions on the edge-data for the existence of a rapidly decaying solution is established. The prescribed edge-data of the beam must satisfy these conditions in order that they could generate a decaying state within the beam. When stress and mixed conditions are imposed on the beam edge, these decaying state conditions for the case of bending deformation of piezoelectric beam are derived explicitly. They are then used for the correct formulation of boundary conditions for the beam theory solution (or the interior solution). Besides, an analytical solution of elastic beam is formulated to verify validity of our boundary conditions. For the stress data, our boundary conditions coincide with those obtained in conventional forms of beam theories. More importantly, the appropriate boundary conditions with two sets of mixed edge-data are obtained for the first time.

关键词： boundary conditions beam bending piezoelectric media decaying states regular states

Detection of Prorocentrum donghaiense using sandwich hybridization integrated with nuclease protection assay

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Acta oceanologica Sinica 2009年第2期28卷 121-126页

作者： CHEN Jie ZHEN Yu MI Tiezhu YU Zhigang college of Marine Life Science Ocean University of China Qingdao 266003 China college of Environmental Science and engineering Ocean University of China Qingdao 266100 China college of Chemistry and Chemical engineering Ocean University of China Qingdao 266100 China

Prorocentrum donghaiense is an important harmful algae bloom （HAB） causing creature in china＇s seas, and the conventional visual detection can not cope with long-term monitoring and highthroughput sampling projects. An assay for P. donghaiense with sandwich hybridization integrated with nuclease protection assay （NPA-SH） was established. Tests with mixed samples and spiked field ones confirmed its good specificity and sensitivity. The cell number of P. donghaiense correlated well with the optical density, and the regression equation is y=4× 10^- 6x＋ 0.694 9, in which x is the cell number, and y is the optical density, with r2=0.953 5. These results show that the NPA-SH method has good feasibility in the detection of P. donghaiense. Results of NPA-SH and microscopy are excellent for each sample. The NPA-SH method was a simple way in quantitative detection of P. donghaiense, and the whole process could be finished in about six hours, which provided a new approach in high-throughput sampling and long-term monitoring of P. donghaiense.

关键词： Prorocentrum donghaiense ribosomal RNA S1 enzyme sandwich hybridization integrated with nuclease protection assay (NPA-SH)

A vortex induced vibration of marine riser in waves

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Acta oceanologica Sinica 2011年第4期30卷 96-101页

作者： LOU Min DONG Wenyi GUO Haiyan college of Petroleum engineering China University of Petroleum （East China） Dongying257061 China Offshore Oil engineering （qingdao） Company Limited Qingdao 266520 China college of engineering Ocean University of China Qingdao 266071 China

A marine riser transporting fluid in the Bohai Sea was selected as study object,using an experi-mental and numerical method to study its vortex induced vibration in waves. A similarity theory was used in the experiment to derive the experimental model from a practical model,the dy-namic response of a riser model was measured in waves. A corresponding numerical simulation was performed using a finite element method. Comparisons were made with the results between the experiment and the numerical simulation. Some valuable results were obtained.

关键词： riser VIV wave experiment

Caspase Family Proteases and Apoptosis

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Acta Biochimica et Biophysica Sinica 2005年第11期37卷 719-727页

作者： Ting-Jun FAN Li-Hui HAN Ri-Shan CONG Jin LIANG college of Marine Life Sciences,Division of Life Science and Technology,ocean university of china,qingdao 266003.china college of Chemistry & Chemical engineering,ocean university of china,qingdao 266003.china college of Marine Life Sciences Division of Life Science and Technology Ocean University of ChinaQingdao 266003 China college of Chemistry & Chemical engineering Ocean University of ChinaQingdao 266003 China

Apoptosis,or programmed cell death,is an essential physiological process that plays a criticalrole in development and tissue *** progress of apoptosis is regulated in an orderly way by aseries of signal cascades under certain *** caspase-cascade system plays vital roles in theinduction,transduction and amplification of intracellular apoptotic ***,closely associated withapoptosis,are aspartate-specific cysteine proteases and members of the interleukin-1β-converting *** activation and function of caspases,involved in the delicate caspase-cascade system,are regu-lated by various kinds of molecules,such as the inhibitor of apoptosis protein,Bcl-2 family proteins,calpain,and Ca2+,Based on the latest research,the members of the caspase family,caspase-cascade system andcaspase-regulating molecules involved in apoptosis are reviewed.

关键词： caspase apoptosis interleukin-1β-converting enzyme family inhibitor of apoptosis protein Bcl-2 family

Lattice dynamical simulation of methane hydrate

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Journal of Natural Gas Chemistry 2010年第1期19卷 43-46页

作者： Lin Wang, Shunle Dong Physics Department, college of Information Science and engineering, ocean university of china, qingdao 266100, Shandong, china Physics Department College of Information Science and Engineering Ocean University of China Qingdao 266100 Shandong China

INS （Inelastic Neutron Scattering） spectrum of methane hydrate was measured on MARI （a direct-geometry chopper spectrometer） at Ruther-ford Appleton Laboratory, UK. Compared with ice Ih, it is found that the whole spectrum of methane hydrate moves toward high-energy by about 1.5 meV. Using lattice dynamical （LD） technique, computer simulations of methane hydrate were carried out. In the simulations, four potential models （BE TIP3P, TIP4P, MCY） were employed to calculate the phonon density of states （PDOS）. Comparing the calculated PDOS spectrum with the experimental spectrum, it is found that BF, TIP4P, and TIP3P potential lattices give out well-separated translational and librational bands while MCY potential lattice is unstable to do so and this model is not suitable to describe hydrate system.

关键词： methane hydrate inelastic neutron scattering lattice dynamical simulation

Colloidal organic carbon in Huanghe, Changjiang and Qiantang River

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Chinese Science Bulletin 1998年第11期43卷 915-917页

作者： WANG Jiangtao college of Chemistry and Chemical engineering, ocean university of qingdao, qingdao 266003, china Callege of Chemistry and Chemical engineering Ocean University of Qingdao Qingdao China

Cross-flow ultrafiltration techniques have been used to separate colloidal organic carbon (COC) from natural water, and COC in three water samples that were collected from Huanghe, Changjiang and Qiantang River was determined. On average, COC comprised about 68.6% of the total dissolved organic carbon. The abundance of COC suggested that COC could play important roles in input fluxes and biogeochemistry of organic carbon.

关键词： cross-flow ultrafiltration colloidal organic carbon.

A thin-layer spectroelectrochemical study of 3,3',5,5'-tetramethylbenzidine at SnO_2:F film optically transparent electrode

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Science china Chemistry 2004年第4期47卷 267-275页

作者： JIAO Kui1, YANG Tao2 & NIU Shuyan1,2 1. college of Chemistry and Molecular engineering, qingdao university of Science and Technology, qingdao 266042, china 2. college of Chemistry and Chemical engineering, ocean university of china, qingdao 266003, china Correspondence should be addressed to Jiao Kui college of Chemistry and Molecular engineering Qingdao University of Science and Technology Qingdao China college of Chemistry and Chemical engineering Ocean University of China Qingdao China

The electrooxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) is dependent on the pH value of Britton-Robinson (B-R) buffer solution. In this work, the electrooxidation behavior of TMB was investigated with a SnO2:F film optically transparent thin-layer spectroelectrochemical cell. TMB underwent one two-electron electrooxidation process in the pH range from 2.0 to < 4.0, and two successive one-electron electrooxidation processes in the pH range from 4.0 to < 7.0 in the B-R buffer solution. At pH 6.5, the electrooxidative product of TMB generated a subsequent chemical reaction to yield an azo compound. Several spectroelectrochemical techniques, such as thin-layer cyclic voltammetry, thin-layer cyclic voltabsorptometry, thin-layer potential-controlled electrolysis absorptometry, thin-layer single-potential-step chronoabsorptometry, thin-layer dou-ble-potential-step chronoabsorptometry, thin-layer single-potential-step open-circuit relaxation chronoabsorptometry, were applied to this investigation. The formal potential E0’ and the electron transfer number corresponding to the electrooxidation of TMB in B-R buffer solution, and the reaction rate constant of the subsequent chemical reaction were determined.

关键词： 3,3′,5,5′-tetramethylbenzidine tin oxide film optically transparent electrode thin-layer spectroelectro-chemistry electrooxidation

Self-assembly structure formation on patterned InP surfaces

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Science china(Technological Sciences) 2009年第9期52卷 2732-2736页

作者： SU Ge1,2,CAO LiXin1 & LIU TianZhong3 1 Institute of Material Science and engineering,ocean university of china,qingdao 266100,china 2 Nanoscale Physics Research Laboratory,School of Physics and Astronomy,the university of Birmingham,Edgbaston,Birmingham B15 2TT,UK 3 college of Food Science and engineering,ocean university of china,qingdao 266003.china Institute of Material Science and engineering Ocean University of China Qingdao China Nanoscale Physics Research Laboratory School of Physics and Astronomy the University of Birmingham Edgbaston Birmingham UK college of Food Science and engineering Ocean University of China Qingdao China

Self-assembly of polystyrene spheres guided by patterned n-type InP substrates has been investigated. InP surfaces were patterned using a variety of methods including wet chemical etching,sputter coating,thermal evaporation,and photo lithography. The self-assembly of polystyrene spheres depended on the appearance of patterns and was affected by the deposition techniques (sputter coating and thermal evaporation) of Au micro-squares. SEM and AFM were used to characterize the surface morphologies.

关键词： self-assembly polystyrene spheres pattern InP surface

Approximately optimal tracking control for discrete time-delay systems with disturbances

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Progress in Natural Science:Materials International 2008年第2期18卷 225-231页

作者： Gongyou Tang a,,Huiying Sun b,Haiping Pang c a college of Information Science and engineering,ocean university of china,qingdao 266100,china b college of Information and Electrical engineering,Shandong university of Science and Technology,qingdao 266510,china c college of Automation and Electronic engineering,qingdao university of Science and Technology,qingdao 266042,china college of Information Science and engineering Ocean University of China Qingdao 266100 China college of Information and Electrical engineering Shandong University of Science and Technology Qingdao 266510 China college of Automation and Electronic engineering Qingdao University of Science and Technology Qingdao 266042 China

Optimal tracking control (OTC) for discrete time-delay systems affected by persistent disturbances with quadratic performance index is considered. By introducing a sensitivity parameter,the original OTC problem is transformed into a series of two-point boundary value (TPBV) problems without time-advance or time-delay terms. The obtained OTC law consists of analytic feedforward and feedback terms and a compensation term which is the sum of an infinite series of adjoint vectors. The analytic feedforward and feedback terms can be found by solving a Riccati matrix equation and two Stein matrix equations. The compensation term can be obtained by using an iteration formula of the adjoint vectors. Observers are constructed to make the approximate OTC law physically realizable. A simulation example shows that the approximate approach is effective in tracking the reference input and robust with respect to exogenous persistent disturbances.

关键词： Discrete systems Time-delay systems Disturbances Optimal control Tracking control