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  • Open Access

    ARTICLE

    Thermal Analysis of Reissner-Mindlin Shallow Shells with FGM Properties by the MLPG

    J. Sladek1, V. Sladek1, P. Solek2, P.H. Wen3, S.N. Atluri4

    CMES-Computer Modeling in Engineering & Sciences, Vol.30, No.2, pp. 77-98, 2008, DOI:10.3970/cmes.2008.030.077

    Abstract A meshless local Petrov-Galerkin (MLPG) method is applied to solve problems of Reissner-Mindlin shells under thermal loading. Both stationary and thermal shock loads are analyzed here. Functionally graded materials with a continuous variation of properties in the shell thickness direction are considered here. A weak formulation for the set of governing equations in the Reissner-Mindlin theory is transformed into local integral equations on local subdomains in the base plane of the shell by using a unit test function. Nodal points are randomly spread on the surface of the plate and each node is surrounded by More >

  • Open Access

    ARTICLE

    Thermal Bending of Reissner-Mindlin Plates by the MLPG

    J. Sladek1, V. Sladek1, P. Solek2, P.H. Wen3

    CMES-Computer Modeling in Engineering & Sciences, Vol.28, No.1, pp. 57-76, 2008, DOI:10.3970/cmes.2008.028.057

    Abstract A meshless local Petrov-Galerkin (MLPG) method is applied to solve thermal bending problems described by the Reissner-Mindlin theory. Both stationary and thermal shock loads are analyzed here. Functionally graded material properties with continuous variation in the plate thickness direction are considered here. The Laplace-transformation is used to treat the time dependence of the variables for transient problems. A weak formulation for the set of governing equations in the Reissner-Mindlin theory is transformed into local integral equations on local subdomains in the mean surface of the plate by using a unit test function. Nodal points are More >

  • Open Access

    ARTICLE

    Analysis of EDL Effect for Pressure-Driven 3D Developing Micro-Scale Flow

    E. Y. K. Ng1, S. T. Tan2

    CMES-Computer Modeling in Engineering & Sciences, Vol.23, No.1, pp. 13-28, 2008, DOI:10.3970/cmes.2008.023.013

    Abstract Microchannels have been recognized as a very effective chemical separation and heat transfer device. The electrical double layer (EDL) effect in a micro-scale flow is however anticipated to be critical. In this paper, Nernst-Planck model (NPM), is used to predict the ion concentration distribution as it is reported to be a more appropriate model for developing microchannel flow. The governing equations are discretised for developing rectangular microchannel flows in Cartesians coordinate. An additional body force source term that is relating to the electric potential, resulted from the EDL effect is introduced in the conventional z-axis momentum More >

  • Open Access

    ABSTRACT

    H-matrix preconditioners for saddle-point systems from meshfree discretization 1

    Suely Oliveira2, Fang Yang2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.3, No.2, pp. 113-120, 2007, DOI:10.3970/icces.2007.003.113

    Abstract In this paper we describe and compare preconditioners for saddle-point systems obtained from meshfree discretizations, using the concepts of hierarchical (or H-)matrices. Previous work by the authors using this approach did not use H-matrix techniques throughout, as is done here. Comparison shows the method described here to be better than the author's previous method, an AMG method adapted to saddle point systems, and conventional iterative methods such as JOR. More >

  • Open Access

    ARTICLE

    Geometrically Nonlinear Analysis of Reissner-Mindlin Plate by Meshless Computation

    P. H. Wen1, Y. C. Hon2

    CMES-Computer Modeling in Engineering & Sciences, Vol.21, No.3, pp. 177-192, 2007, DOI:10.3970/cmes.2007.021.177

    Abstract In this paper, we perform a geometrically nonlinear analysis of Reissner-Mindlin plate by using a meshless collocation method. The use of the smooth radial basis functions (RBFs) gives an advantage to evaluate higher order derivatives of the solution at no cost on extra-interpolation. The computational cost is low and requires neither the connectivity of mesh in the domain/boundary nor integrations of fundamental/particular solutions. The coupled nonlinear terms in the equilibrium equations for both the plane stress and plate bending problems are treated as body forces. Two load increment schemes are developed to solve the nonlinear More >

  • Open Access

    ARTICLE

    The Effect of Internal Support Conditions to the Elastoplastic Transient Response of Reissner-Mindlin Plates

    C. P. Providakis1

    CMES-Computer Modeling in Engineering & Sciences, Vol.18, No.3, pp. 247-258, 2007, DOI:10.3970/cmes.2007.018.247

    Abstract The method of Domain/Boundary Element is used to achieve a dynamic analysis of elastoplastic thick plates resting on internal supports. All possible boundary conditions on the edge of the plate with any interior support conditions such as isolated points (column), lines (walls) or regions (patches) can be treated without practical difficulties. The formulation presented includes the effects of shear deformation and rotatory inertia following Reissner-Mindlin's deformation theory assumptions. The method employs the elastostatic fundamental solution of the problem resulting in both boundary and domain integrals due to inertia, plasticity and interior support effect terms. By More >

  • Open Access

    ARTICLE

    Concentration analysis in steay-state of ascorbate radical in soybean seedlings determined by electronic paramagnetic resonancy

    Galatro Andrea, Ivan Rousseau, Susana Puntarulo

    Phyton-International Journal of Experimental Botany, Vol.75, pp. 7-20, 2006, DOI:10.32604/phyton.2006.75.007

    Abstract Electron Paramagnetic Resonance (EPR) has been developed as a versatile field that uses different techniques sharing the common feature of resonant micro-wave radiation absorption by paramagnetic substances. Certain free radicals, such as ascorbyl radical (A•), show an stable spectrum, and can be directly detected by EPR at room temperature. Studies included in this work clearly show that this highly sensitive methodology can be successfully applied to biological systems. Exposure of plants to UV-B radiation was studied as a factor of oxidative stress in plants, and the effect on A steady state concentration was analyzed. A kinetic More >

  • Open Access

    ARTICLE

    Negative Pressure-induced Secretion of Inflammatory Mediators by Cultured Middle Ear Epithelial Cells: Relevance to Eustachian Tube Dysfunction and Otitis Media with Effusion

    P. A. Hebda1, M. R. Barsic1, J. E. Dohar1

    Molecular & Cellular Biomechanics, Vol.3, No.4, pp. 231-232, 2006, DOI:10.32604/mcb.2006.003.231

    Abstract This article has no abstract. More >

  • Open Access

    ARTICLE

    Dual Boundary Element Method for Instability Analysis of Cracked Plates

    J. Purbolaksono1, M. H. Aliabadi2,3

    CMES-Computer Modeling in Engineering & Sciences, Vol.8, No.1, pp. 73-90, 2005, DOI:10.3970/cmes.2005.008.073

    Abstract This paper presents the dual boundary integral equations for the buckling analysis of the shear deformable cracked plates. The domain integrals which appear in this formulation are transferred to boundary integrals using the dual reciprocity method. The plate buckling displacement and hypersingular traction integral equations are presented as a standard eigenvalue problem, which would allow direct evaluation of the critical load factor and buckling modes. Several examples with different geometries and boundary conditions are presented to demonstrate the accuracy of the proposed formulation. More >

  • Open Access

    ARTICLE

    Evaluation of Tension in Actin Bundle of Endothelial Cells Based on Preexisting Strain and Tensile Properties Measurements

    S. Deguchi1,2, T. Ohashi2, M. Sato2

    Molecular & Cellular Biomechanics, Vol.2, No.3, pp. 125-134, 2005, DOI:10.3970/mcb.2005.002.125

    Abstract Actin bundles in vascular endothelial cells (ECs) play a critical role in transmitting intracellular forces between separate focal adhesion sites. However, quantitative descriptions of tension level in single actin bundles in a physiological condition are still poorly studied. Here, we evaluated magnitude of preexisting tension in a single actin bundle of ECs on the basis of measurements of its preexisting stretching strain and tensile properties. Cultured ECs expressing fluorescently-labeled actin were treated with detergents to extract acin bundles. One end of an actin bundle was then dislodged from the substrate by using a microneedle, resulting… More >

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