Showing 4 results for Vahid
Esmaeil Babolian, Ar Vahidi,
Volume 11, Issue 2 (2-2011)
Abstract
In this paper, we conduct a comparative study between the homotopy perturbation method (HPM) and Adomian’s decomposition method (ADM) for analytic treatment of nonlinear Volterra integral equations, and we show that the HPM with a specific convex homotopy is equivalent to the ADM for these type of equations.
Vahide Keramati,
Volume 11, Issue 3 (2-2011)
Abstract
A simple hydrothermal method was designed for the synthesis of the nanostructure Barium phosphonate in presence of cetyltrimethylammonium bromide (CTAB) or sodium dodecyl sulfate (SDS) as surfactant. FT-IR, EDAX, XRF, XRD, SEM were used to characterize this material. Effect of solvent on morphology complex was discussed. Thermogr avimetric analysis (TGA) shows the existence of porosity and stability of the material.
Vahid Ahadnejad,
Volume 13, Issue 4 (2-2014)
Abstract
The magnetic anisotropy of rocks results from the contributions of diamagnetic, paramagnetic, & ferromagnetic minerals. This bulk anisotropy of magnetic susceptibility, which can be rapidly measured with modern instruments, generally provides a better understanding of the rock deformation history. Different minerals in a rock can form at different times and also respond to deformation in different manners. Therefore it is useful to separate their respective contributions to the whole rock magnetic fabric. Various techniques available to achieve this separation among them measurement of the magnetic properties at high fields, above the saturation magnetization of ferromagnetic minerals, effectively separates the diamagnetic-paramagnetic magnetic anisotropy. In this paper, the anisotropies of ferromagnetic and paramagnetic components are separated using High-Field Analysis torque for 37 samples of natural rocks. These samples are igneous rocks of Malayer that are mainly composed of paramagnetic minerals (e.g. biotite and amphibole) and few portions of ferromagnetic minerals (e.g. titanomagnetite) which are located in the quratz-feldespathic (diamagnetic) context. Anisotropy of Magnetic Susceptibility (AMS) in low field analyses indicated that paramagnetic phases are the dominant control of the magnetic fabric. This is confirmed by High Field Analyses (HFA) which implied that magnetic characteristics are dominated by paramagnetic minerals, except for three samples.
Hassan Rabani, Mohammad Mardaani, Hamideh Vahid,
Volume 14, Issue 2 (7-2014)
Abstract
In this paper, we study the electronic transport of a multi-molecular chain of copper phthalocyanine connected to two metallic leads by using Green’s function method at the tight-binding approach. The results show that in the gaps of this system, the density of states is independent of the number of molecules or the system length. Moreover, increasing of the system length decreases the tunneling conductance and causes the appearance of peaks and dips in the gaps of the conductance spectra and depending on the value of incoming electron energy, the electron tunneling takes place easier, especially in the edges of the gaps.
