Majid Monemzadeh

Abstract: This paper studies the generalized equations of electromagnetic fields and their solutions in long waveguides with several regions made of materials with Hermitian dielectric tensors and elliptical cross-sections. The special conditions under which the quadratic homogeneous equations of the hybrid modes can be reduced to second-order equations are presented. © 2011 Taylor & Francis.

Abstract: In this paper, we have calculated the masses of mesons containing t-quark and their spins' coupling coefficients. This was achieved by solving Lippmann-Schwinger equation for the quark-antiquark bound state of heavy mesons in configuration space. Heavy meson masses submitted criteria for the strong nuclear interactive potential between two quarks. We investigated the stability of a few suitable potentials and offered the best of these potentials for heavy mesons. © 2010 Springer Science+Business Media, LLC.

Abstract: We choose the mechanical action of open string in the presence of constant B-fields, which allows us to build up constraint structures. In an open string theory, the secondary constraints give rise to noncommutativity of the string coordinates on the boundaries. We find that applying the BatalinFradkinFradkinaTyutin (BFFT) formalism to this noncommutative system converts it to a commutative one and makes new local gauge symmetries. © 2011 World Scientific Publishing Company.

Abstract: We choose the mechanical action of open string in the presence of constant B-fields, which allows us to build up constraint structures. In an open string theory, the secondary constraints give rise to noncommutativity of the string coordinates on the boundaries. We find that applying the BatalinFradkinFradkinaTyutin (BFFT) formalism to this noncommutative system converts it to a commutative one and makes new local gauge symmetries. © 2011 World Scientific Publishing Company.

Abstract: This paper studies the generalized equations of electromagnetic fields and their solutions in long waveguides with several regions made of materials with Hermitian dielectric tensors and elliptical cross-sections. The special conditions under which the quadratic homogeneous equations of the hybrid modes can be reduced to second-order equations are presented. © 2011 Taylor & Francis.

Abstract: In this paper, we have calculated the masses of mesons containing t-quark and their spins' coupling coefficients. This was achieved by solving Lippmann-Schwinger equation for the quark-antiquark bound state of heavy mesons in configuration space. Heavy meson masses submitted criteria for the strong nuclear interactive potential between two quarks. We investigated the stability of a few suitable potentials and offered the best of these potentials for heavy mesons. © 2010 Springer Science+Business Media, LLC.

Abstract: The synthesis of manganese oxide (Mn3O4) nanoparticles by using thermal decomposition and its physicochemical characterization are being reported in present investigation. As a new precursor, [bis(2-hydroxy-1-naphthaldehydato)manganese(II)] complex was used in the presence of oleylamine (C18H37N) as both surfactant and solvent to control the size of resulting nanoparticle. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and Raman spectrum. Synthesized manganese oxide nanoparticles have a tetragonal structure with average size of 9-24 nm. The phase pure samples were characterized by using X-ray photoelectron spectroscopy (XPS) for Mn 2p level. The values of binding energies are consistent with the relative values are reported in the literature. As a comparison between two methods, the novel precursor thermally was treated in solid state reaction in different temperature, 400, 500, and 600 °C and the products were characterized by SEM images. Magnetic property of the as-prepared Mn3O4 nanoparticle shows a ferromagnetic behavior with high saturation magnetization and coercivity. © 2010 Elsevier Ltd. All rights reserved.

Abstract: In this Letter the dielectric permittivity tensor and field equations in multi layer cold collisionless magnetized inhomogeneous drift plasma columns with confocal elliptical cross sections are investigated. It will be shown that the dielectric tensor of each region can be written as non-operational Hermitian and pure spatial operational parts. © 2010 Elsevier B.V.

Abstract: The synthesis of manganese oxide (Mn3O4) nanoparticles by using thermal decomposition and its physicochemical characterization are being reported in present investigation. As a new precursor, [bis(2-hydroxy-1-naphthaldehydato)manganese(II)] complex was used in the presence of oleylamine (C18H37N) as both surfactant and solvent to control the size of resulting nanoparticle. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and Raman spectrum. Synthesized manganese oxide nanoparticles have a tetragonal structure with average size of 9-24 nm. The phase pure samples were characterized by using X-ray photoelectron spectroscopy (XPS) for Mn 2p level. The values of binding energies are consistent with the relative values are reported in the literature. As a comparison between two methods, the novel precursor thermally was treated in solid state reaction in different temperature, 400, 500, and 600 °C and the products were characterized by SEM images. Magnetic property of the as-prepared Mn3O4 nanoparticle shows a ferromagnetic behavior with high saturation magnetization and coercivity. © 2010 Elsevier Ltd. All rights reserved.

Abstract: In this Letter the dielectric permittivity tensor and field equations in multi layer cold collisionless magnetized inhomogeneous drift plasma columns with confocal elliptical cross sections are investigated. It will be shown that the dielectric tensor of each region can be written as non-operational Hermitian and pure spatial operational parts. © 2010 Elsevier B.V.

Abstract: The pattern of intensity transmitted due to the interference in a non-dissipative dispersive thin layer (NDDTL) is investigated. For the layer mentioned the generalized relations for line width, power resolution, magnitude of the minima and visibility of interference fringes are presented. Finally the interference patterns of a cold collisionless plasma layer as a NDDTL sample are simulated. © 2009 Springer Science+Business Media, LLC.

Abstract: This study focuses on the preparation and characterization of single phase NiO nanoparticles. At first, nickel-o-phthalate complexes as precursor were synthesized through semisolid phase reaction method and then NiO nanoparticles were obtained via a solid-state decomposition procedure of layered coordination nickle-o-phthalate complexes formulated as [Ni(pht)(H2O)2] and [Ni(pht)2]. In addition, the effects of calcination temperature and metal-to-ligand ratio on the particle size and morphology of NiO were investigated. Thermogravimetric analysis (TGA) was applied to determine the thermal behavior of complexes. The crystalline structure of products by X-ray diffractometer (XRD), morphology of particles by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were studied. The composition of as-prepared sample was studied by X-ray photoelectron spectroscopy (XPS) spectra. Analysis of FT-IR spectra confirmed the composition of products. The magnetic property was studied with vibrating sample magnetometer (VSM). © 2009 Elsevier B.V. All rights reserved.

Abstract: The pattern of intensity transmitted due to the interference in a non-dissipative dispersive thin layer (NDDTL) is investigated. For the layer mentioned the generalized relations for line width, power resolution, magnitude of the minima and visibility of interference fringes are presented. Finally the interference patterns of a cold collisionless plasma layer as a NDDTL sample are simulated. © 2009 Springer Science+Business Media, LLC.

Abstract: This study focuses on the preparation and characterization of single phase NiO nanoparticles. At first, nickel-o-phthalate complexes as precursor were synthesized through semisolid phase reaction method and then NiO nanoparticles were obtained via a solid-state decomposition procedure of layered coordination nickle-o-phthalate complexes formulated as [Ni(pht)(H2O)2] and [Ni(pht)2]. In addition, the effects of calcination temperature and metal-to-ligand ratio on the particle size and morphology of NiO were investigated. Thermogravimetric analysis (TGA) was applied to determine the thermal behavior of complexes. The crystalline structure of products by X-ray diffractometer (XRD), morphology of particles by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were studied. The composition of as-prepared sample was studied by X-ray photoelectron spectroscopy (XPS) spectra. Analysis of FT-IR spectra confirmed the composition of products. The magnetic property was studied with vibrating sample magnetometer (VSM). © 2009 Elsevier B.V. All rights reserved.

Abstract: We show that the BFT embedding method is problematic for mixed systems (systems possessing both first and second class constraints). The Chern-Simons theory as an example is worked out in detail. We give two methods to solve the problem leading to two different types of finite order BFT embedding for Chern-Simons theory. © 2005 The American Physical Society.

Abstract: We show that the BFT embedding method is problematic for mixed systems (systems possessing both first and second class constraints). The Chern-Simons theory as an example is worked out in detail. We give two methods to solve the problem leading to two different types of finite order BFT embedding for Chern-Simons theory. © 2005 The American Physical Society.

Abstract: We have constructed a modified BFT method that preserves the chain structure of constraints. This method has two advantages: first, it leads to less number of primary constraints such that the remaining constraints emerge automatically; and second, it gives less number of independent gauge parameters. We have applied the method for bosonized chiral Schwinger model. We have constructed a gauge invariant embedded Lagrangian for this model. © 2004 Elsevier B.V. All rights reserved.

Abstract: We have constructed a modified BFT method that preserves the chain structure of constraints. This method has two advantages: first, it leads to less number of primary constraints such that the remaining constraints emerge automatically; and second, it gives less number of independent gauge parameters. We have applied the method for bosonized chiral Schwinger model. We have constructed a gauge invariant embedded Lagrangian for this model. © 2004 Elsevier B.V. All rights reserved.

Abstract: We propose a method in the context of BFFT approach that leads to truncation of the infinite series regarded as constraints in the extended phase space, as well as other physical quantities (such as Hamiltonian). This has been done for cases where the matrix of Poisson brackets among the constraints is symplectic or constant. The method is applied to the Proca model, single self dual chiral bosons and chiral Schwinger models as examples.

Abstract: We propose a method in the context of BFFT approach that leads to truncation of the infinite series regarded as constraints in the extended phase space, as well as other physical quantities (such as Hamiltonian). This has been done for cases where the matrix of Poisson brackets among the constraints is symplectic or constant. The method is applied to the Proca model, single self dual chiral bosons and chiral Schwinger models as examples.