Azarbaijan Shahid Madani University, , , commonly called only Azarbaijan University, is a public university located near Tabriz, East Azarbaijan Province, Iran, founded in 1987. The university provides bachelor, master, and doctoral education to about 7.500 students at a wide range of fields of study such as engineering, basic scienses, literature and theology. Wikipedia.
Habibi B.,Shahid Madani University of Azarbaijan
International Journal of Hydrogen Energy | Year: 2013
Palladium nanoparticles were fabricated on the aluminum electrode (Pd/Al) by electrodeposition method through a single step potential from an aqueous solution of 1 mM Pd(NH3)4Cl2. The electrochemical and physical characteristics of the Pd/Al were investigated by cyclic voltammetry, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) method. Electrochemical measurements in acidic solution indicate that Pd/Al exhibits significantly high electrochemical active surface area (18.32 cm2) with respect to Pd-Al (2.1 cm2) (electroless deposited) and bare Pd (0.28 cm2) electrodes. SEM images and XRD results show that the Pd particles are homogeneously deposited on the surface Al substrate in nanoparticles size between 30 and 50 nm with maximum Pd (111) plane at 2θ angles about of 39°. The Pd/Al was used as electrocatalyst for the oxidation of formic acid (FA) in 0.1 M H2SO4 solution. The cyclic voltammetry and chronoamperometry results show that the obtained electrocatalyst, Pd/Al, exhibits high catalytic activity and stability for the electrooxidation of FA. On the other hand, the Pd/Al electrocatalyst has higher catalytic activity for FA oxidation than the comparative Pd-Al and bare Pd electrodes and shows great potential as less expensive electrocatalyst for FA oxidation in direct formic acid fuel cells. Crown Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Shaghaghi Z.,Shahid Madani University of Azarbaijan
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2014
Due to their potential applicability as selective receptors in optical sensors, two novel azo Schiff-base derivatives I and II are synthesized and characterized with FT-IR, 1H NMR and elemental analysis techniques. The optical response of azo groups of I and II towards Ni2+, Co 2+, Cu2+, Pb2+, Hg2+, Zn 2+ and Cd2+ metal ions is studied in DMSO by UV-vis spectroscopy. The absorption spectra of both compounds with cations show marked changes. In solution, azo Schiff-base I produces a cation induced 95 nm blue shift for Cu2+ ion from 555 nm to 460 nm with remarkable color change from red to yellow. Whereas no significant color change is observed upon addition of studied metal cations to the solution of ligand II or other metal ions to the solution of ligand I. Furthermore, Job's plot indicate 1:1 binding-stoichiometry for I with Cu2+ ion and Benesi-Hildebrand plot is used for the determination of its association constant. Therefore receptor I is highly specific for copper ions in DMSO solution. Finally, the study of antioxidant properties of I and II with DPPH method reveals high and significant activities. © 2014 Elsevier B.V. All rights reserved.
Aalipour R.,Shahid Madani University of Azarbaijan
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2014
Spectral singularities are spectral points of non-Hermitian Hamiltonians with the real energies, that annihilate the completeness of the eigenfunctions. The complex PT-symmetric potentials with real spectrum have such Hamiltonians. It was identified that the spectral singularities of complex potentials such as an optical gain medium correspond to zero-width resonance modes of the reflected and transmitted beams from the medium. We show that a Fabry-Perot resonator with a gain medium under inclined incident beam exhibits spectral singularities that are measurable by changing the incident angle of the beam to the resonator. The results are realized by theory and simulations. © 2014 American Physical Society.
Darabi F.,Shahid Madani University of Azarbaijan
European Physical Journal C | Year: 2013
The breakdown of conformal symmetry in a conformally invariant scalar-tensor gravitational model is revisited in the cosmological context. Although the old scenario of conformal symmetry breaking in cosmology containing a scalar field has already been used in many earlier works, it seems that no special attention has been paid for the investigation on the possible connection between the breakdown of conformal symmetry and the existence of dark energy. In this paper, it is shown that the old scenario of conformal symmetry breaking in cosmology, if properly interpreted, not only has a potential ability to describe the origin of dark energy as a symmetry breaking effect, but also may resolve the coincidence problem. © 2013 Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica.
Akbari-Moghanjoughi M.,Shahid Madani University of Azarbaijan
Journal of Plasma Physics | Year: 2013
By investigating the dielectric response of the Fermi-Dirac plasma in the linear limit and evaluating the electrostatic potential around the positive stationary test charge, we find that the Shukla-Eliasson attractive force is present for the plasma density range expected in the interiors of large planets for a wide range of plasma atomic number. This research, which is based on the generalized electron Fermi-momentum, further confirms the existence of the newly discovered Lennard-Jones-like attractive potential and its inevitable role in plasma crystallization in the cores of planets. Moreover, it is observed that the characteristics of the attractive potential are strongly sensitive to the variation of plasma density and composition. Current research can also have applications in the study of strong laser-matter interactions and inertially confined plasmas. © Cambridge University Press 2012.