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  • Open Access

    ARTICLE

    Crack Propagation Modeling by Remeshing Using the Cell Method (CM)

    E. Ferretti1

    CMES-Computer Modeling in Engineering & Sciences, Vol.4, No.1, pp. 51-72, 2003, DOI:10.3970/cmes.2003.004.051

    Abstract A numerical code for modeling crack propagation using the cell method is proposed. The Mohr-Coulomb criterion is used to compute the direction of crack propagation, and the new crack geometry is realized by an intra-element propagation technique. Automatic remeshing is then activated. Applications in Mode I and Mixed Mode are presented to illustrate the robustness of the implementation. More >

  • Open Access

    ARTICLE

    A New Application of the Panel Clustering Method for 3D SGBEM

    A. Aimi1, M. Diligenti1, F. Lunardini1, A. Salvadori2

    CMES-Computer Modeling in Engineering & Sciences, Vol.4, No.1, pp. 31-50, 2003, DOI:10.3970/cmes.2003.004.031

    Abstract This paper is devoted to the study of a new application of the Panel Clustering Method [Hackbusch and Sauter (1993); Hackbusch and Nowak (1989)]. By considering a classical 3D Neumann screen problem in its boundary integral formulation discretized with the Galerkin BEM, which requires the evaluation of double integrals with hypersingular kernel, we recall and use some recent results of analytical evaluation of the inner hypersingular integrals. Then we apply the Panel Clustering Method (PCM) for the evaluation of the outer integral. For this approach error estimate is shown. Numerical examples and comparisons with classical More >

  • Open Access

    ARTICLE

    A Level Set Approach to Optimal Homogenized Coefficients

    Dongwoo Sheen1, Sangwon Seo2, Jinwoo Cho3

    CMES-Computer Modeling in Engineering & Sciences, Vol.4, No.1, pp. 21-30, 2003, DOI:10.3970/cmes.2003.004.021

    Abstract The reconstructing optimal microstructures of given homogenized coefficients of steady diffusion equation is studied. In the reconstruction, the governing equation of level set function is approximated by adding viscosity term and the numerical procedure for the evolution of the level set function for the solution is examined. The numerical experiments of reconstruction are obtained by applying a finite element method with locally fitted mesh. More >

  • Open Access

    ARTICLE

    On Simple Formulations of Weakly-Singular Traction & Displacement BIE, and Their Solutions through Petrov-Galerkin Approaches

    Z. D. Han1, S. N. Atluri1

    CMES-Computer Modeling in Engineering & Sciences, Vol.4, No.1, pp. 5-20, 2003, DOI:10.3970/cmes.2003.004.005

    Abstract Using the directly derived non-hyper singular integral equations for displacement gradients [as in Okada, Rajiyah, and Atluri (1989a)], simple and straight-forward derivations of weakly singular traction BIE's for solids undergoing small deformations are presented. A large number of ``intrinsic properties'' of the fundamental solutions in elasticity are developed, and are used in rendering the tBIE and dBIE to be only weakly-singular, in a very simple manner. The solutions of the weakly singular tBIE and dBIE through either global Petrov-Galerkin type ``boundary element methods'', or, alternatively, through the meshless local Petrov-Galerkin (MLPG) methods, are discussed. As More >

  • Open Access

    EDITORIAL

    Editorial

    S. N. Atluri1

    CMES-Computer Modeling in Engineering & Sciences, Vol.4, No.1, pp. 1-4, 2003, DOI:10.3970/cmes.2003.004.001

    Abstract This article has no abstract. More >

  • Open Access

    ABSTRACT

    Minireview: Pigmented corpuscles in the midgut gland of Pomacea canaliculata and other Neotropical apple-snails (Prosobranchia, Ampullariidae): A possible symbiotic association

    A. Castro-Vazquez, E.A. Albrecht, I.A. Vega, E. Koch, C. Gamarra-Luques

    BIOCELL, Vol.26, Suppl.S, pp. 101-109, 2002

    Abstract This article has no abstract. More >

  • Open Access

    ARTICLE

    Water relations and leaf growth rate of three Agropyron genotypes under water stress

    MARÍA G. GARCÍA, CARLOS A. BUSSO, PABLO POLCI, NORBERTO L. GARCÍA GIROU, VIVIANA ECHENIQUE

    BIOCELL, Vol.26, No.3, pp. 309-317, 2002, DOI:10.32604/biocell.2002.26.309

    Abstract The effects of water stress on leaf water relations and growth are reported for three perennial tussock grass genotypes under glasshouse conditions. Studies were performed in genotypes El Palmar INTA and Selección Anguil of Agropyron scabrifolium (Döell) Parodi, and El Vizcachero of A. elongatum (Host) Beauv. Agropyron scabrifolium El Palmar INTA is native to a region with warm-temperate and humid climate without a dry season, and an average annual precipitation of 900 mm. Agropyron scabrifolium Selección Anguil comes from a region with a sub-humid, dry to semiarid climate and a mean annual precipitation of 600 mm. Agropyron elongatum is a… More >

  • Open Access

    ARTICLE

    In vitro propagation of Opuntia ellisiana Griff. and acclimatization to field conditions

    MARÍA CECILIA JUÁREZ1, CARLOS BERNARDO PASSERA1,2

    BIOCELL, Vol.26, No.3, pp. 319-324, 2002, DOI:10.32604/biocell.2002.26.319

    Abstract The genus Opuntia is a valuable forage resource in arid and semiarid lands during periods of drought and shortage of herbaceous plants. However, absolute minimum temperatures in the plains of Mendoza represent a limiting factor to cultivate several species.
    Opuntia ellisiana is a cold hardy species, so the goals of this study were to massively propagate it using in vitro culture techniques, and then to acclimatize plantlets obtained to field conditions.
    Different sterilization protocols were tested. Areoles were isolated in laminar airflow cabinet, and cultured on Murashige-Skoog medium, supplemented with sucrose and different BAP and IBA combinations.… More >

  • Open Access

    ARTICLE

    Oogenesis in the swamp eel Synbranchus marmoratus (Bloch, 1795) (Teleostei; synbranchidae). Ovarian anatomy, stages of oocyte development and micropyle structure

    MARIO ALDO RAVAGLIA , MARÍA CRISTINA MAGGESE

    BIOCELL, Vol.26, No.3, pp. 325-337, 2002, DOI:10.32604/biocell.2002.26.325

    Abstract Synbranchus marmoratus (Synbranchidae), commonly known as the swamp eel, is a protogynous diandric teleost fish widely distributed throughout South America. The purpose of this work was to study the ovarian anatomy and to describe oocyte developmental stages in the swamp eel, Synbranchus marmoratus.
    S. marmoratus has a unique sacular ovary. It is covered by a conspicuous muscular wall, probably involved in an egg-releasing system acting as a peristaltic-like mechanism. The internal ovarian anatomy shows a Ushaped ovarian lamella delimiting a dorsal ovarian lumen. The microscopic study shows evidence of the existence of a germinal epithelium in the… More >

  • Open Access

    ARTICLE

    Effects of high molybdenum intake on 1,2-dimethylhydrazine-induced intestinal tumors in rats

    M.A. MONTENEGRO*, M. SÁNCHEZ NEGRETTE*, E.J. GIMENO**, J.T. BORDA*

    BIOCELL, Vol.26, No.3, pp. 339-345, 2002, DOI:10.32604/biocell.2002.26.339

    Abstract Wistar male rats, 3 months of age were given ad-libitum a nutritionally adequate diet and demineralized drinking water. The Molybdenum (Mo) and Tungsten (W) were provided in the drinking water at 200 ppm concentration. Intestinal tumors were induced by 1,2-dimethylhydrazine (DMH) given subcutaneously as 16 weekly doses at 20 mg/kg body weight. Mo in the form of (NH4)6 Mo7O24 4H2O or W in the form of (Na2 WO4) were provided in the drinking water two months before the first DMH treatment and were continued during 4 months more until the last DMH treatment. Three months after the last… More >

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