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  • Open Access

    ARTICLE

    Stability parameters in yield and adaptability for rice 25 genotypes of Campeche, Mexico

    Orona Castro F1, J Medina Méndez1, FM Tucuch Cauich1, JM Soto Rocha1, IH Almeyda León2

    Phyton-International Journal of Experimental Botany, Vol.82, pp. 255-261, 2013, DOI:10.32604/phyton.2013.82.255

    Abstract We conducted a comparative study from 2008 to 2011 to study the adaptability and stability of grain yield of upland rice in two regions of Campeche, Mexico. The individual and combined statistical analysis, showed highly significant differences in grain yield of different genotypes in both regions. The experimental error variance was uniform, both effects of repetition/location and variety/location were highly significant. The results of analysis for grain yield stability parameters showed highly significant effects for 12 treatments, and significant for one. Eighteen genotypes showed a significant variation in the effects of deviation from the regression More >

  • Open Access

    ARTICLE

    Determination of insecticide resistance in four populations of potato psillid Bactericera cockerelli (Sulc.) (Hemiptera: Triozidae)

    Cerna E, Y Ochoa, LA Aguirre, M Flores, J Landeros

    Phyton-International Journal of Experimental Botany, Vol.82, pp. 63-68, 2013, DOI:10.32604/phyton.2013.82.063

    Abstract Southeastern potato growing regions from Coahuila and Nuevo León contribute with 15% to domestic production. Such production has been impacted by several factors, in particular Bactericera (=Paratrioza) cockerelli Sulc potato psyllid, one of the most important pests affecting this crop. Its control is based on Insecticide applications, leading to unsatisfactory results and high selection pressure. Five insecticides were evaluated in four field populations of B. cockerelli from the growing region, using a susceptible laboratory line for comparison. The field populations were collected from greenhouse and commercial orchards located at Huachichil, Saltillo, Raíces and San Rafael localities. All… More >

  • Open Access

    ARTICLE

    Analysis of Multiple Inclusion Potential Problems by the Adaptive Cross Approximation Method

    R. Q. Rodríguez1, A.F. Galvis1, P. Sollero1, E. L. Albuquerque2

    CMES-Computer Modeling in Engineering & Sciences, Vol.96, No.4, pp. 259-274, 2013, DOI:10.3970/cmes.2013.096.259

    Abstract Over recent years the rapid evolution of the computational power has motivated the development of new numerical techniques to account for engineering solutions. The Boundary Element Method (BEM) has shown to be a powerful numeric tool for the analysis and solution of many physical and engineering problems. However, BEM fully populated and non-symmetric system matrices implies in higher memory requirements and solution times. This work analyze the application of hierarchical matrices and low rank approximations, applying the Adaptive Cross Approximation - ACA, to multiple inclusion potential problems. The use of hierarchical format is aimed at More >

  • Open Access

    ARTICLE

    An Inverse Problem for Two Spectra of Complex Finite Jacobi Matrices

    Gusein Sh. Guseinov1

    CMES-Computer Modeling in Engineering & Sciences, Vol.86, No.4, pp. 301-320, 2012, DOI:10.3970/cmes.2012.086.301

    Abstract This paper deals with the inverse spectral problem for two spectra of finite order complex Jacobi matrices (tri-diagonal symmetric matrices with complex entries). The problem is to reconstruct the matrix using two sets of eigenvalues, one for the original Jacobi matrix and one for the matrix obtained by replacing the first diagonal element of the Jacobi matrix by some another number. The uniqueness and existence results for solution of the inverse problem are established and an explicit algorithm of reconstruction of the matrix from the two spectra is given. More >

  • Open Access

    ARTICLE

    Relationships between the bioactive compound content and environmental variables in Glycyrrhiza uralensis populations in different habitats of North China

    Zhang JT1, B Xu1, M Li2

    Phyton-International Journal of Experimental Botany, Vol.80, pp. 161-166, 2011, DOI:10.32604/phyton.2011.80.161

    Abstract The content of active compounds in Glycyrrhiza uralensis may vary among populations in different regions, and be influenced by environmental variables. We determined the effects of soil and climate on contents of glycyrrhizic acid and liquiritin in various populations of Glycyrrhiza uralensis. Fifty individuals from 5 rangeland populations in arid and semi-arid regions of North China were collected and analyzed. The contents of glycyrrhizic acid and liquiritin were determined using the HPLC method. Contents of glycyrrhizic acid and liquiritin varied significantly among populations as follows: Chifeng > Hangjinqi > Minqin > Aletai > Kashi. These contents were More >

  • Open Access

    ARTICLE

    Impact Force Identification of CFRP Structures Using Experimental Transfer Matrices

    S. Atobe1, H. Fukunaga1, N. Hu2

    CMC-Computers, Materials & Continua, Vol.26, No.1, pp. 67-90, 2011, DOI:10.3970/cmc.2011.026.067

    Abstract This paper presents a method for identifying the location and force history of an impact force acting on CFRP structures such as laminated plates and stiffened panels. The identification method is an experimental one without using any analytical model of the structure. Here, experimental transfer matrices, which relate the impact force to the corresponding responses of PZT sensors, are used to identify the impact force. The transfer matrices are preliminarily constructed from the measured data obtained by impact tests with an impulse hammer. To identify the impact location, the arrival times of the flexural waves More >

  • Open Access

    ARTICLE

    A Highly Accurate Multi-Scale Full/Half-Order Polynomial Interpolation

    Chein-Shan Liu1

    CMC-Computers, Materials & Continua, Vol.25, No.3, pp. 239-264, 2011, DOI:10.3970/cmc.2011.025.239

    Abstract For the computational applications in several areas, we propose a single-scale and a multi-scale diagonal preconditioners to reduce the condition number of Vandermonde matrix. Then a new algorithm is given to solve the inversion of the resulting coefficient matrix after multiplying by a preconditioner to the Vandermonde matrix. We apply the new techniques to the interpolation of data by using very high-order polynomials, where the Runge phenomenon disappears even the equidistant nodes are used. In addition, we derive a new technique by employing an m-order polynomial with a multi-scale technique to interpolate 2m+1 data. Numerical results More >

  • Open Access

    ARTICLE

    Comparison of the Fast Multipole Method with Hierarchical Matrices for the Helmholtz-BEM

    D. Brunner1, M. Junge1, P. Rapp1, M. Bebendorf2, L. Gaul1

    CMES-Computer Modeling in Engineering & Sciences, Vol.58, No.2, pp. 131-160, 2010, DOI:10.3970/cmes.2010.058.131

    Abstract The simulation of the hydroacoustic sound radiation of ship-like structures has an ever-growing importance due to legal regulations. Using the boundary element method, the overall dimension of the problem is reduced and only integrals over surfaces have to be considered. Additionally, the Sommerfeld radiation condition is automatically satisfied by proper choice of the fundamental solution. However, the resulting matrices are fully populated and the set-up time and memory consumption scale quadratically with respect to the degrees of freedom. Different fast boundary element methods have been introduced for the Helmholtz equation, resulting in a quasilinear complexity.… More >

  • Open Access

    ARTICLE

    Absolute Stability of Chaotic Asynchronous Multi-Interactions Schemes for Solving ODE

    P. Redou1, L. Gaubert1, G. Desmeulles1, P-A. Béal2, C. Le Gal2, V. Rodin3

    CMES-Computer Modeling in Engineering & Sciences, Vol.70, No.1, pp. 11-40, 2010, DOI:10.3970/cmes.2010.070.011

    Abstract Multi Interaction Systems, used in the context of Virtual Reality, are dedicated to real-time interactive simulations. They open the way to the in virtuo experimentation, especially useful in the domain of biochemical kinetics. To this purpose, chaotic and asynchronous scheduling of autonomous processes is based upon desynchronization of phenomena involved in the system. It permits interactivity, especially the capability to add or remove phenomena in the course of a simulation. It provides methods of resolution of ordinary differential systems and partial derivative equations. Proofs of convergence for these methods have been established, but the problem of More >

  • Open Access

    ARTICLE

    Novel Algorithms Based on the Conjugate Gradient Method for Inverting Ill-Conditioned Matrices, and a New Regularization Method to Solve Ill-Posed Linear Systems

    Chein-Shan Liu1, Hong-Ki Hong1, Satya N. Atluri2

    CMES-Computer Modeling in Engineering & Sciences, Vol.60, No.3, pp. 279-308, 2010, DOI:10.3970/cmes.2010.060.279

    Abstract We propose novel algorithms to calculate the inverses of ill-conditioned matrices, which have broad engineering applications. The vector-form of the conjugate gradient method (CGM) is recast into a matrix-form, which is named as the matrix conjugate gradient method (MCGM). The MCGM is better than the CGM for finding the inverses of matrices. To treat the problems of inverting ill-conditioned matrices, we add a vector equation into the given matrix equation for obtaining the left-inversion of matrix (and a similar vector equation for the right-inversion) and thus we obtain an over-determined system. The resulting two modifications… More >

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