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Items from 61 to 80 out of 9,437,523 results

article

Mapped CWENO scheme for hyperbolic conservation laws

Cong Huang, Rong Wang

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 229-244

In this paper, we analysis the Central Weighted Essentially Non-Oscillatory (CWENO) scheme for hyperbolic conservation laws (Qiu and Shu, 2002). The CWENO procedure contains three major steps: the reconstruction of u ̄ i + 1 ∕ 2 n from u ̄ i n , the reconstruction of u i n from u ̄ i n , and the approximation of ∫ t n t n +...

article

Adaptive numerical approach based upon Chebyshev operational vector for nonlinear Volterra integral equations and its convergence analysis

K. Maleknejad, R. Dehbozorgi

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 356-366

In the current paper, we present a direct numerical scheme to approximate a second-kind nonlinear Volterra integral equations (NVIEs). The scheme is based upon shifted Chebyshev polynomials and its operational matrices which eventually leads to the sparsity of the coefficients matrix of obtained system. The main idea of the proposed approach is based on a useful property of Chebyshev polynomials that...

article

Rapid generalized Schultz iterative methods for the computation of outer inverses

Marko D. Petković, Mihailo A. Krstić, Kostadin P. Rajković

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 572-584

We present a general scheme for the construction of new efficient generalized Schultz iterative methods for computing the inverse matrix and various matrix generalized inverses. These methods have the form X k + 1 = X k p ( A X k ) , where A is m × n complex matrix and p ( x ) is a polynomial. The construction procedure is general and can be applied to any number of matrix...

article

On approximate inverse of Hermite and Laguerre collocation differentiation matrices and new collocation schemes in unbounded domains

Chao Zhang, Li-Lian Wang, Dongqin Gu, Wenjie Liu

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 553-571

In this paper, we provide an explicit, stable and fast means to compute the approximate inverse of Hermite/Laguerre collocation differentiation matrices, and also the approximate inverse of the Hermite/Laguerre collocation matrices of a second-order differential operator. The latter offers optimal preconditioners for developing well-conditioned Hermite/Laguerre collocation schemes. We apply the new...

article

Type I multivariate zero-truncated/adjusted Poisson distributions with applications

Guo-Liang Tian, Yin Liu, Man-Lai Tang, Xuejun Jiang

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 132-153

Although there is substantial literature on the univariate zero-truncated Poisson (ZTP) distributions, few works have been done for developing multivariate ZTP distributions with dimension larger than two. In this paper, we first propose a new Type I multivariate ZTP distribution to model multivariate zero-truncated count data and develop its important distributional properties, while providing efficient...

article

Interactions between earthworms and mesofauna affect CO2 and N2O emissions from soils under long-term conservation tillage

Xinyu Zhu, Liang Chang, Jiujia Li, Jie Liu, more

Geoderma > 2018 > 332 > C > 153-160

Soil carbon dioxide (CO₂) and nitrous oxide (N₂O) emissions contribute significantly to global warming. Studies have shown that soil fauna can significantly affect greenhouse gas emissions. To date, although there were some studies on the effect of interactions of soil fauna on soil CO₂ and N₂O emissions, the role of soil fauna on CO₂ and N₂O emissions is far from settled, especially for a wide variety...

article

Symmetric trigonometrically-fitted two-step hybrid methods for oscillatory problems

Jiyong Li, Xianfen Wang, Shuo Deng, Bin Wang

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 115-131

In this paper, we propose a general class of trigonometrically-fitted two-step hybrid (TFTSH) methods for solving numerically oscillatory second-order initial value problems. The TFTSH methods integrate exactly the differential system whose solutions can be expressed as the linear combinations of functions from the set { exp ( i w t ) , exp ( − i w t ) } or equivalently the set { cos (...

article

Editorial: Algorithmic Aspects of High-Performance Computing for Mechanics and Physics

Victor Calo, Santiago Badia, Javier Principe

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 739

article

A new weak Galerkin finite element scheme for general second-order elliptic problems

Guanrong Li, Yanping Chen, Yunqing Huang

Journal of Computational and Applied Mathematics > 2018 > 344 > C > 701-715

A new weak Galerkin (WG) finite element scheme is presented for general second-order elliptic problems in this paper. In this new scheme, a skew symmetric form has been used for handling the convection term. The advantage of the new scheme is that the system of linear equations from the scheme is positive definite and one might easily get the well-posedness of the system. In this scheme, the WG elements...

article

Influence of soil properties and feedstocks on biochar potential for carbon mineralization and improvement of infertile soils

Ali El-Naggar, Sang Soo Lee, Yasser Mahmoud Awad, Xiao Yang, more

Geoderma > 2018 > 332 > C > 100-108

The impact of biochar (BC) application on soil varies with BC feedstock and soil type. The objective of this study was to investigate the linkage between the properties and surface functionality of various BCs and their role in the rehabilitation of two infertile soils. Sandy loam (SL) and sandy (S) soils were collected from agricultural areas in Korea and Vietnam, respectively. The BCs of amur silvergrass...

article

Comparison of diffusive gradients in thin-films (DGT) and chemical extraction methods for predicting bioavailability of antimony and arsenic to maize

Suhuan Zhang, Ying Wang, Aneesa Pervaiz, Linghao Kong, more

Geoderma > 2018 > 332 > C > 1-9

Antimony (Sb) and arsenic (As) are hazardous metalloids that cause much attention. Assessing the bioavailability is essential for understanding the potential risk and toxicity of Sb and As in soils. In this study, a set of methods were tested to assess the bioavailability of Sb and As to field/potted maize. Twelve soils, 7 maize (Zea mays L.) samples and corresponding root soils were collected from...

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...

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Mapped CWENO scheme for hyperbolic conservation laws

Adaptive numerical approach based upon Chebyshev operational vector for nonlinear Volterra integral equations and its convergence analysis

Rapid generalized Schultz iterative methods for the computation of outer inverses

On approximate inverse of Hermite and Laguerre collocation differentiation matrices and new collocation schemes in unbounded domains

Type I multivariate zero-truncated/adjusted Poisson distributions with applications

Interactions between earthworms and mesofauna affect CO2 and N2O emissions from soils under long-term conservation tillage

Symmetric trigonometrically-fitted two-step hybrid methods for oscillatory problems

Editorial: Algorithmic Aspects of High-Performance Computing for Mechanics and Physics

A new weak Galerkin finite element scheme for general second-order elliptic problems

Influence of soil properties and feedstocks on biochar potential for carbon mineralization and improvement of infertile soils

Comparison of diffusive gradients in thin-films (DGT) and chemical extraction methods for predicting bioavailability of antimony and arsenic to maize

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

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