in this paper, the two-dimensional triangular orthogonal functions (2d-tfs) are applied for solving a class of nonlinear two-dimensional volterra integral equations. 2d-tfs method transforms these integral equations into a system of linear algebraic equations. the high accuracy of this method is verified through a numerical example and comparison of the results with the other numerical methods.

This paper presents the simulation of fragmentation warhead using a hydrocode, Autodyn. The goal of this research is to determine the lethal range of such a warhead. This study investigates the lethal range of warheads with and without steel balls as preformed fragments. The results from the FE simulation, i.e. initial velocities and ejected spray angles of fragments, are further processed usin...

The objective of this research is the formulation, implementation, and validation of a numerical method to accurately model and simulate explosion blast and shock waves for the disruption of asteroids. While the cases presented in this paper are not explosions caused by actual nuclear devices, they will aid in validation of the numerical model for future nuclear-explosion simulations. Current w...

A new series of peptide-like derivatives containing different aromatic amino acids andpossessing pharmacophores of COX-2 inhibitors as SO2Me or N3 attached to the para positionof an end phenyl ring was synthesized for evaluation as selective cyclooxygenase-2 (COX-2)inhibitors. The synthetic reactions were based on the solid phase peptide synthesis methodusing Wang resin. One of the analogues, i...

Sexual dimorphism in digit ration is related to genetic differences between species in response to prenatal exposure to hormones. In this study, the development of tetrapod digits, preliminary the ratio between the length of digit II and IV (2D: 4D) was investigated in 34 samples of Darevskia cholorogaster in the North of Iran. The results showed no significant differences between sexes in any ...

The computing industry is rapidly moving from a programming to learning area, with the reign of von Neumann architecture starting fade, after many years dominance. new paradigms non-von architectures have started leading development emerging artificial neural network (ANN)-based analog electronic intelligence (AI) chipsets remarkable energy efficiency. However, size and advantages processing el...

The interface characteristics and microstructure formation of TA2-5083 composite plate after explosive welded were studied. Optical microscope electron used to analyze the intermetallic compounds. Furthermore, ANSYS/AUTODYN was adopted calculate simulated by smooth-particle hydrodynamics (SPH) method. results show that most molten metal in wave front stays wave-waist region. There a relative ve...

Abstract The change of the liner material directly affects penetration and damage performance shaped charge. In this paper, Ti-29Nb-13Ta-4.6Zr (TNTZ) was used as charge liner. Autodyn software to analyze jet formation TNTZ liner, then static explosion test conducted liners. following conclusions were obtained: A structure proposed for alloy, simulation shows that a with acceptable L/D ratio for...