introduction: numerous studies have investigated the prevalence, incidence and clinical manifestations of gastrointestinal stromal tumors (gists). however, little is known about gists in iran. this pioneer study focuses on description of 36 patients with gists in iran. methods: a database was created for 36 patients suffering from gist who were treated in loghman medical center and tehran cance...

We present an algorithm for meshing surfaces that is a simple adaptation of a greedy “farthest point” technique proposed by Chew. Given a surface S, it progressively adds points on S and updates the 3dimensional Delaunay triangulation of the points. The method is very simple and works in 3d-space without requiring to parameterize the surface. Taking advantage of recent results on the restricted...

In this paper, the structure of a liquid and character of its flow in carbon nanotube is investigated. A review of the literature and the results of experiments show that the simulation of fluid flow for nanoscale systems should be based on the continuum hypothesis taking into account the quantized character of the liquid in the length scale of intermolecular distances. Consideration of the flo...

Surface reconstruction from sets of cross-sectional data is important in a variety of applications. The problem of generating a ship hull surface from non-regular cross-sectional curves is addressed. Generating non-uniform rational B-splines (NURBS) surfaces that represent cross-sectional curves is a challenge, since the number of control points is growing due to the non-avoidable process of ha...

The probability generating function is a powerful technique for studying the law of finite sums of independent discrete random variables taking integer positive values. For real valued discrete random variables, the well known elementary theory of Dirichlet series and the symbolic computation packages available nowadays, such as Mathematica 5 TM, allows us to extend to general discrete random v...

smooth muscles, and therefore, improved erection (McCullough, 2002; Ulhayathas et al., 2007). Evidence shows that sildenafil inhibits cGMP degradation in the brain (Hotchkiss et al., 2005; Riazi et al., 2006) and affects the central nervous system (Ulhayathas et al., 2007). In the NO-cGMP pathway, sildenafil modulates cognition, memory, reward-related stimuli, pain perception, seizure attack, n...

Ditte Caroline Andersen,1,2,* Charlotte Harken Jensen,1 and Søren Paludan Sheikh1,3 1Laboratory of Molecular and Cellular Cardiology, Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, 5000 Odense C, Denmark 2Clinical Institute/University of Southern Denmark, 5000 Odense C, Denmark 3Institute of Molecular Medicine/University of Southern Denmark, 5000 Odense C, Den...

Canul-Chay et al. [1] have conducted the segregation experiment of binary granular mixtures in a bed and subjected the bed to vibration. They report that the reverse Brazil-Nut phenomenon (RBNP) was never observed in their experiments and thus conclude that such does not exist. However, we have clearly demonstrated in [2] by Molecular Dynamics simulations that the reverse Brazil-Nut problem not...