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Search Results: 1 - 10 of 46 matches for " SHIRZAD ZAFARIAN "
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Preparation And Characterization Of Magnetite Nanoparticles By Sol-Gel Method For Water Treatment
International Journal of Innovative Research in Science, Engineering and Technology , 2013,
Abstract: Environmental Pollution Such As Dyes Has Been Excessively Released Into The Environment And Has Created A Major Global Concern. Congo Red Is A Benzidine-Based Anionic Diazo Dye With Two Azo Groups. It Is Toxic To Many Organisms And Is A Suspected Carcinogen And Mutagen. The Presence Of Congo Red (CR) In Water Even At Very Low Concentration Is Highly Visible And Undesirable. Present Work Is Focused On Synthesis Of Magnetite Nanoparticles Which Showed A High Adsorption Capacity Of Congo Red And Is Useful In Removal Of CR From Wastewater. Magnetite (Fe3O4) Nanoparticles Have Been Successfully Synthesized By Sol–Gel Method By Using Ferric Nitrate (Fe (NO3)3.9H2O) And Ethylene Glycol (C2H6O2) As Precursors In Different Annealing Temperatures. The Obtained Nanoparticles Have Been Characterized By X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), X-Ray Energy Dispersive Spectrometer (EDS) And Particle Size Analyzer. XRD Measurements Indicate That The Obtained Nanoparticles Are Single Phase And The Particle Size Increased By Increasing The Temperature.
Synthesis and Characterization of -Al2O3 Platelet Nanoparticle as a Direct Product of Solution Combustion Method
Hamed Sadabadi,,Adeleh Aftabtalab,,Shirzad Zafarian,,K.Venkateswara.Rao
International Journal of Engineering and Advanced Technology , 2013,
Abstract: Crystalline -Al2O3 was synthesized by the solution combustion of aluminum nitrate and urea in aqueous media. The effect of conditions was further investigated in detail. The XRD analysis shows that the crystalline -Al2O3 was obtained directly by SC method without annealing at high temperature above 1100oC, and the crystalline size can estimate from XRD result. The SEM micrograph shows the morphology of particles. Thermal behavior of -Al2O3 was evaluated by applying Thermal gravimetric and differential thermal analysis (TG/DTA).
Perfect and Imperfect Gauge Fixing
A. Shirzad
Mathematics , 2006, DOI: 10.1063/1.2709846
Abstract: Gauge fixing may be done in different ways. We show that using the chain structure to describe a constrained system, enables us to use either a perfect gauge, in which all gauged degrees of freedom are determined; or an imperfect gauge, in which some first class constraints remain as subsidiary conditions to be imposed on the solutions of the equations of motion. We also show that the number of constants of motion depends on the level in a constraint chain in which the gauge fixing condition is imposed. The relativistic point particle, electromagnetism and the Polyakov string are discussed as examples and perfect or imperfect gauges are distinguished.
Modular Invariant Partition Functions and Method of Shift Vector
H. Arfaei,A. Shirzad
Physics , 1993, DOI: 10.1063/1.530770
Abstract: Using shift vector method we obtain a large class of self-dual lattices of dimension $(l,l)$, which has a one to one correspondence with modular invariants of free bosonic theory compactified on co-root lattice of a rank $l$ Lie group. Then a large number of modular invariants of affine Lie algebras are derived explicitly. As two applications of this method, we give a direct derivation of $D$-series of $SU(N)$ and a new proof for the A-D-E classification of the $SU(2)_k$ partition functions.
Classification of constraints using chain by chain method
F Loran,A Shirzad
Physics , 2000, DOI: 10.1142/S0217751X02009643
Abstract: We introduce "chain by chain" method for constructing the constraint structure of a system possessing both first and second class constraints. We show that the whole constraints can be classified into completely irreducible first or second class chains. We found appropriate redefinition of second class constraints to obtain a symplectic algebra among them.
Finite Order BFFT Method
M. Monemzadeh,A. Shirzad
Physics , 2003, DOI: 10.1142/S0217751X03016501
Abstract: We have proposed a method in the context of BFFT approach that leads to truncation of the infinite series regarded to 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 Proca model, single self dual chiral bosons and chiral Schwinger models as examples.
Gauge Fixing in the Chain by Chain Method
A Shirzad,F Loran
Physics , 1999,
Abstract: In a recent work we showed that for a Hamiltonian system with constraints, the set of constraints can be investigated in first and second class constraint chains. We show here that using this "chain by chain" method for an arbitrary system one can fix the gauges in the most economical and consistent way. We show that it is enough to assume some gauge fixing conditions conjugate to last elements of first class chains. The remaining necessary conditions would emerge from consistency conditions.
Dirac Quantization of Some Singular Theories
A Shirzad,P Moyassari
Physics , 2001,
Abstract: Analyzing the constraint structure of electrodynamics, massive vector bosons, Dirac fermions and electrodynamics coupled to fermions, we show that Dirac quantization method leads to appropriate creation-annihilation algebra among the Forier coefficients of the fields.
Constraint structure in modified Faddeev-Jackiw method
A. Shirzad,M. Mojiri
Physics , 2001, DOI: 10.1142/S021773230100593X
Abstract: We show that in modified Faddeev-Jackiw formalism, first and second class constraints appear at each level, and the whole constraint structure is in exact correspondence with level by level method of Dirac formalism.
Constraint structure of the three dimensional massive gravity
M. Sadegh,A. Shirzad
Physics , 2010, DOI: 10.1103/PhysRevD.83.084040
Abstract: Constraint analysis of the three-dimensional massive gravity, the so- called new massive gravity, is studied in the Palatini formalism. We show that amongst 6 components of the metric, 2 are dynamical, which is compatible with the existence of one vector massive graviton in the linearized theory (Fierz-Pauli theory).
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