The capability of a discrete element model to predict the constitutive response soil is investigated in this paper. constituted spherical particles with contact law embedding inter-particle rolling resistance. study has been carried out constrained framework: complexity limited favour its simplicity use, calibration independent initial state soil, validation be robust sense that loading paths s...

Recently, camouflaging geographical origin of agricultural products is a major problem in Japan. Therefore, we developed a distributed geographical origin identification system which identifies cultivated farms of vegetables by using trace element compositions of vegetables. This system stores compositions of trace, or very small quantities of elements into database which located on farming dis...

The efficient treatment of dense matrices arising, e.g., from the finite element discretisation of integral operators requires special compression techniques. In this article we use the H-matrix representation that approximates the dense stiffness matrix in admissible blocks (corresponding to subdomains where the underlying kernel function is smooth) by low-rank matrices. The low-rank matrices ...

The rounding-error analysis of Gaussian elimination shows that the method is stable only when the elements of the matrix do not grow excessively in the course of the reduction. Usually such growth is prevented by interchanging rows and columns of the matrix so that the pivot element is acceptably large. In this paper firstly we introduce the Boosting LU factorization method based on a rank one ...

The aim of this paper is to develop a fast numerical method for two-dimensional boundary integral equations of the first kind with logarithm kernels when the boundary of the domain is smooth and closed. In this case, the use of the conventional boundary element methods gives linear systems with dense matrix. In this paper, we demonstrate that the dense matrix can be replaced by a sparse one if ...

It has been established by Inoue that a complex locally C*-algebra with a dense ideal posesses a bounded approximate identity which belonges to that ideal. It has been shown by Fritzsche that if a unital complex locally C*-algebra has an unbounded element then it also has a dense one-sided ideal. In the present paper we obtain analogues of the aforementioned results of Inoue and Fritzsche for r...

We study the variety generated by three-element equivalential algebra with conjunction on dense elements. prove representation theorem which let us construct free algebras in this variety.