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article

Macrofauna and mesofauna from soil contaminated by oil extraction

David García-Segura, Isis Maviel Castillo-Murrieta, Froylán Martínez-Rabelo, Antonio Gomez-Anaya, more

Geoderma > 2018 > 332 > C > 180-189

Mexico is an oil producing country; the extraction of oil on land has left many sites with soil contaminated by oil spills. The aim of our study was to determine the impact of this contamination on the soil fauna; thus we compared the macro and mesofauna from a non contaminated soil to a moderately and highly polluted soil caused by oil extraction. Total petroleum hydrocarbons (TPH) and soil physicochemical...

article

A new approach for numerical solution of two-dimensional nonlinear Fredholm integral equations in the most general kind of kernel, based on Bernstein polynomials and its convergence analysis

A. Babaaghaie, K. Maleknejad

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 482-494

Regarding the efficient previous method for approximation of one-dimensional functions integrals through Bernstein polynomials in Amirfakhrian (2011), this paper presents a development of this method for approximation of two-dimensional functions integrals for the first time. Then, by combining this approximation with Bernstein collocation method for numerical solution of two-dimensional nonlinear...

article

Simultaneous confidence bands for a percentile hyper-plane with covariates constrained in a restricted range

Sanyu Zhou, Jingjing Zhu, Defa Wang

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 301-312

A simultaneous confidence band provides useful information about the plausible range of the unknown regression model. In several recent papers, confidence bands have been used for various inferential purposes; see, for example, Liu et al. (2004, 2005, 2009, 2010, 2012, 2014), Liu and Hayter (2007) [1], Liu and Lin (2009), Piegorsch et al. (2005), Han et al. (2015) and Zhou (2017). The construction...

article

Reliability estimation of multicomponent stress–strength model based on copula function under progressively hybrid censoring

Xuchao Bai, Yimin Shi, Yiming Liu, Bin Liu

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 100-114

In reliability analysis of the stress–strength models, the stress and strength variables are typically assumed as independent. However, such an assumption may be unrealistic in some applications. It is a meaningful issue to estimate the reliability of the stress–strength model for dependent stress and strength variables. In this paper, we estimate the reliability of multicomponent stress–strength...

article

Beta-diversity partitioning approach in soil zoology: A case of Collembola in pine forests

N.A. Kuznetsova, A.K. Saraeva

Geoderma > 2018 > 332 > C > 142-152

The paper analyzes the structure of diversity in Collembola – an abundant group of small soil-dwelling arthropods. Collembola were studied in two regions of East European forest subzones: mid-boreal and boreo-nemoral. The study was carried out in ecological series of pine forests arranged along the moisture gradient: moist sphagnum, mesic green moss, and dry lichen types. The study was repeated in...

article

Operator splitting for chemical reaction systems with fast chemistry

Axel Ariaan Lukassen, Martin Kiehl

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 495-511

Splitting methods are frequently used for large scale chemical reaction systems. The main reason is the reduced computational cost for solving the subproblems in comparison to the time integration of the full problem. However, a splitting error is introduced. The most popular splitting schemes are the first order Lie–Trotter splitting and the second order Strang splitting. However, in case of stiff...

article

High dimensional integration of kinks and jumps—Smoothing by preintegration

Andreas Griewank, Frances Y. Kuo, Hernan Leövey, Ian H. Sloan

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 259-274

We show how simple kinks and jumps of otherwise smooth integrands over R d can be dealt with by a preliminary integration with respect to a single well chosen variable. It is assumed that this preintegration, or conditional sampling, can be carried out with negligible error, which is the case in particular for option pricing problems. It is proven that under appropriate conditions the preintegrated...

article

On a two-dimensional risk model with time-dependent claim sizes and risky investments

Ke-Ang Fu, Chenglong Yu

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 367-380

Consider a two-dimensional risk model, in which two insurance companies divide between them the claims in some specified proportions. Suppose that the claim sizes and inter-arrival times form a sequence of independent and identically distributed random pairs, with each pair obeying a dependence structure, and the surpluses of the two companies are invested into portfolios whose returns follow two...

article

Functional approach to the error control in adaptive IgA schemes for elliptic boundary value problems

S. Matculevich

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 394-423

This work presents a numerical study of functional type a posteriori error estimates for IgA approximation schemes in the context of elliptic boundary-value problems. Along with the detailed discussion of the most crucial properties of such estimates, we present the algorithm of a reliable solution approximation together with the scheme of an efficient a posteriori error bound generation. In this...

article

An efficient hybrid tridiagonal divide-and-conquer algorithm on distributed memory architectures

Shengguo Li, François-Henry Rouet, Jie Liu, Chun Huang, more

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 512-520

In this paper, we propose an efficient divide-and-conquer (DC) algorithm for symmetric tridiagonal matrices based on ScaLAPACK and the hierarchically semiseparable (HSS) matrices. HSS is an important type of rank-structured matrices. The most computationally intensive part of the DC algorithm is computing the eigenvectors via matrix–matrixmultiplications (MMM). In our parallel hybrid DC (PHDC) algorithm,...

article

On the spectrum of two-layer approach and Multiplex PageRank

Francisco Pedroche, Esther García, Miguel Romance, Regino Criado

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 161-172

In this paper, we present some results about the spectrum of the matrix associated with the computation of the Multiplex PageRank defined by the authors in a previous paper. These results can be considered as a natural extension of the known results about the spectrum of the Google matrix. In particular, we show that the eigenvalues of the transition matrix associated with the multiplex network can...

article

Indigenous soil classification in four villages of eastern South Africa

Nkosinomusa Nomfundo Buthelezi-Dube, Jeffrey Charles Hughes, Pardon Muchaonyerwa

Geoderma > 2018 > 332 > C > 84-99

Ethnopedology has significantly contributed to understanding local perceptions of soil, and its uses and management, and has complemented technical (scientific) surveys. This study focused on indigenous soil classification of the Zulu and Xhosa ethnic groups of eastern South Africa. The study area comprised four villages, viz Khokhwane (104 ha) and Potshini (577 ha) in KwaZulu-Natal Province and Ntshiqo...

article

Relaxation model for the p -Laplacian problem with stiffness

Heesun Choi, Hongjoong Kim, Marc Laforest

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 173-189

This paper proposes a new numerical scheme in 1-D for the p -Laplacian problem for the electromagnetic effects in a high-temperature Type II superconductors. The scheme is obtained by applying a relaxation approximation to the nonlinear derivatives in the problem. The new relaxation scheme achieves highly accurate results even for large p that makes the p -Laplacian flux stiff. The scheme is novel...

article

Implementation of Discontinuous Skeletal methods on arbitrary-dimensional, polytopal meshes using generic programming

M. Cicuttin, D.A. Di Pietro, A. Ern

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 852-874

Discontinuous Skeletal methods approximate the solution of boundary-value problems by attaching discrete unknowns to mesh faces (hence the term skeletal) while allowing these discrete unknowns to be chosen independently on each mesh face (hence the term discontinuous). Cell-based unknowns, which can be eliminated locally by a Schur complement technique (also known as static condensation), are also...

article

PyFly: A fast, portable aerodynamics simulator

D. Garcia, M. Ghommem, N. Collier, B.O.N. Varga, more

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 875-903

We present a fast, user-friendly implementation of a potential flow solver based on the unsteady vortex lattice method (UVLM), namely PyFly. UVLM computes the aerodynamic loads applied on lifting surfaces while capturing the unsteady effects such as the added mass forces, the growth of bound circulation, and the wake while assuming that the flow separation location is known a priori. This method is...

article

Alteration of organic matter during remediation of acid sulfate soils

Angelika Kölbl, Petra Marschner, Luke Mosley, Rob Fitzpatrick, more

Geoderma > 2018 > 332 > C > 121-134

When acid sulfate soils with hypersulfidic material dry, oxidation of pyrite can cause strong acidification due to formation of sulfuric (pH < 4) material. Re-saturation of acid sulfate soils containing sulfuric material can lead to re-formation of pyrite and pH increase through activity of sulfate reducing bacteria, which require available organic carbon (OC). In the Lower River Murray region...

article

Solvability and optimal controls of impulsive Hilfer fractional delay evolution inclusions with Clarke subdifferential

Aicha Harrat, Juan J. Nieto, Amar Debbouche

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 725-737

We study the solvability and optimal controls of an impulsive nonlinear Hilfer fractional delay evolution inclusion in Banach spaces. For the main results, we use fractional calculus, fixed point technique, semigroup theory and multivalued analysis. We introduce the notion of Clarke delay subdifferential. To continue and extend previous works in the field, we prove an existence result of optimal control...

article

A geostatistical Vis-NIR spectroscopy index to assess the incipient soil salinization in the Neretva River valley, Croatia

Monika Zovko, Davor Romić, Claudio Colombo, Erika Di Iorio, more

Geoderma > 2018 > 332 > C > 60-72

Soil spectroscopy can provide low-cost and high-density data for predicting various soil properties. However, a relatively weak correlation between the spectra and the measurements of salinized soil makes spectroscopy difficult to use in predicting areas at risk of salinization, especially for low and moderately saline soils. The main objective of the study was to propose an effective approach based...

article

An energy-stable generalized- α method for the Swift–Hohenberg equation

A.F. Sarmiento, L.F.R. Espath, P. Vignal, L. Dalcin, more

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 836-851

We propose a second-order accurate energy-stable time-integration method that controls the evolution of numerical instabilities introducing numerical dissipation in the highest-resolved frequencies. Our algorithm further extends the generalized- α method and provides control over dissipation via the spectral radius. We derive the first and second laws of thermodynamics for the Swift–Hohenberg equation...

article

Splitting schemes for the stress formulation of the incompressible Navier–Stokes equations

Peter Minev, Petr N. Vabishchevich

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 807-818

This paper presents a novel approach to the Navier–Stokes equations which reformulates them in terms of a new tensor variable. In the first formulation discussed in the paper this variable is proportional to the gradient of the velocity field with the pressure added to the diagonal components. In the second formulation it is identical to the stress tensor. At first glance the resulting tensorial problem...

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Search results

Macrofauna and mesofauna from soil contaminated by oil extraction

A new approach for numerical solution of two-dimensional nonlinear Fredholm integral equations in the most general kind of kernel, based on Bernstein polynomials and its convergence analysis

Simultaneous confidence bands for a percentile hyper-plane with covariates constrained in a restricted range

Reliability estimation of multicomponent stress–strength model based on copula function under progressively hybrid censoring

Beta-diversity partitioning approach in soil zoology: A case of Collembola in pine forests

Operator splitting for chemical reaction systems with fast chemistry

High dimensional integration of kinks and jumps—Smoothing by preintegration

On a two-dimensional risk model with time-dependent claim sizes and risky investments

Functional approach to the error control in adaptive IgA schemes for elliptic boundary value problems

An efficient hybrid tridiagonal divide-and-conquer algorithm on distributed memory architectures

On the spectrum of two-layer approach and Multiplex PageRank

Indigenous soil classification in four villages of eastern South Africa

Relaxation model for the p -Laplacian problem with stiffness

Implementation of Discontinuous Skeletal methods on arbitrary-dimensional, polytopal meshes using generic programming

PyFly: A fast, portable aerodynamics simulator

Alteration of organic matter during remediation of acid sulfate soils

Solvability and optimal controls of impulsive Hilfer fractional delay evolution inclusions with Clarke subdifferential

A geostatistical Vis-NIR spectroscopy index to assess the incipient soil salinization in the Neretva River valley, Croatia

An energy-stable generalized- α method for the Swift–Hohenberg equation

Splitting schemes for the stress formulation of the incompressible Navier–Stokes equations

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