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Search Results: 1 - 10 of 579978 matches for " A. G. Davodi "
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Numerous Exact Solutions for the Dodd–Bullough–Mikhailov Equation by Some Different Methods
A. G. Davodi,D. D. Ganji,M. M. Alipour
Sel?uk Journal of Applied Mathematics , 2009,
Abstract: In this work, we implement some analytical techniques such as Tan, Tanh, Extended Tanh and Sech methods for solving the nonlinear partial differential equation, which contain exponential terms; its name, Dodd–Bullough–Mikhailov (DBM) equation. These methods can be used as an alternative to obtain exact solutions of different types of differential equations which applied in engineering mathematics.
Exact Travelling Solutions for the Generalized (1+1) Dimensional and the Generalized (2+1) Dimensional Ito Equations by G′/G -Expansion Method
M. Abdollahzadeh,D. D. Ganji,A. G. Davodi,M. Barzegar
Sel?uk Journal of Applied Mathematics , 2010,
Abstract: In this paper, we establish exact solutions for some nonlinear partial differential integral equations (PDIE). The (((G′)/G))-expansion method was used to construct travelling wave solutions of the generalized (1+1) dimensional and the generalized (2+1) dimensional Ito equations. In this method we take the advantage of general solutions of second order linear ordinary differential equation (LODE) to solve effectively many nonlinear evolution equations. The (((G′)/G))-expansion method presents a wider applicability for handling nonlinear wave equations.
Short-run Process Control Based on Non-conformity Degree
Majid Aminnayeri,Elnaz Asghari Torkamani,Mehdi Davodi,Faraz Ramtin
Lecture Notes in Engineering and Computer Science , 2010,
Mortality Effects of Human NPH Insulin (Lansulin N) and Symmetrel (Amantadine Hydrochloride) on German Cockroach: Blattela germanica (L.)
Abolghasemi Esmail,Moosa-Kazemi Seyed Hassan,Abolghasemi Fatemeh,Abolhasani Mandan,Khodaei Homa,Davodi Maryam
Research Journal of Biological Sciences , 2012, DOI: 10.3923/rjbsci.2011.304.308
Abstract: Human NPH insulin (Lansulin N) considered as anti-diabetes drug. In addition, symmetrel (amantadine hydrochloride) found as anti-virus and anti-Parkinson drug which the mortality effects of the drugs was the study against Blattela germanica. German cockroaches were reared at 25±20°C, 40-50% RH and 14L:10D photoperiod cycle. The concentration of 5, 10, 15, 20 and 25 μL of Human NPH insulin (Lansulin N) and 0.5, 1, 2, 4 and 8% of symmetrel (amantadine hydrochloride) was used. The data were analyzed using SPSS software. p<0.05 was considered significant as the difference between groups. Dose of 20 μL of Lansulin N causing death among the 63.34% of the samples in addition, 86.67% of German cockroaches killed after the exposure with 2% dose of the amantadine hydrochloride. There is significant mortality was found between the doses of 2% with comparing to another doses (p<0.05). In significant mortality found after exposure with 20 μL of Lansulin N with comparing the other dose (p<0.05). The dose of 2% amantadine hydrochloride and 20 μL Lansulin N cause reduces irritability, weakness and eventual death of these cockroaches. The researchers suggested that the appropriate doses of these drugs as a poisoned bait or gel used against the wild strain of B. germanica in the future.
Quality Issues in Higher Education: A Multicriteria Framework of Satisfaction Measures  [PDF]
G. A. Dimas, A Goula, G. Pierrakos
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.23042
Abstract: Higher education attributes significant interest to student satisfaction because of its potential impact on the quality dimensions of the offered services. This is illustrated from the large number of studies that have shown a moderate to strong relationship between these two concepts. This paper provides a detailed analysis of a student satisfaction survey conducted at the Health Care Management Department of the Technological Education Institute of Athens. The analysis was based on a multi-criteria preference disaggregation method (MUSA). Results are focused on the evaluation of student choices, while significant findings of the applied methodology constitute the determination of strong and weak points of the educational component’s preferences that form important suggestions for the improvement of the satisfaction level and the quality characteristics of the correspondent services.
A Fourth Order Improved Numerical Scheme for the Generalized Burgers—Huxley Equation  [PDF]
A. G. Bratsos
American Journal of Computational Mathematics (AJCM) , 2011, DOI: 10.4236/ajcm.2011.13017
Abstract: A fourth order finite-difference scheme in a two-time level recurrence relation is proposed for the numerical solution of the generalized Burgers--Huxley equation. The resulting nonlinear system, which is analysed for stability, is solved using an improved predictor-corrector method. The efficiency of the proposed method is tested to the kink wave using both appropriate boundary values and conditions. The results arising from the experiments are compared with the relevant ones known in the available bibliography.
External Magnetic Field Effects on the Rayleigh-Taylor Instability in an Inhomogeneous Rotating Quantum Plasma  [PDF]
G. A. Hoshoudy
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.311224
Abstract: The effects of external magnetic field effects on the Rayleigh-Taylor instability in an inhomogeneous stratified quantum plasma rotating uniformly are investigated. The external magnetic field is considered in both horizontal and vertical direction. The linear growth rate is derived for the case where a plasma with exponential density distribution is confined between two rigid planes at z=0 and z=h, by solving the linear QMHD equations into normal mode. Some special cases are particularized to explain the roles that play the variables of the problem. The results show that, the presence of both external horizontal and vertical magnetic field beside the quantum effect will bring about more stability on the growth rate of unstable configuration. The maximum stability will happen in the case of wave number parallels to or in the same direction of external horizontal magnetic field.
Equilibrium Dynamics in the Neoclassical Growth Model with Habit Formation and Elastic Labor Supply  [PDF]
Manuel A. Gómez
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.25087
Abstract: This note analyzes the equilibrium dynamics in the neoclassical growth model with habit-forming preferences and elastic labor supply. Habits enter into utility in a multiplicative way. The specification of the habit formation process comprises the particular cases of internal and external habits. Existence, uniqueness and saddle-path stability of the steady state are proved analytically.
Rayleigh-Taylor Instability in Magnetized Plasma  [PDF]
G. A. Hoshoudy
World Journal of Mechanics (WJM) , 2014, DOI: 10.4236/wjm.2014.48027

The Rayleigh-Taylor instability in stratified plasma has been investigated in the presence of combined effect of horizontal and vertical magnetic field. The linear growth rate has been derived for the case where plasma with exponential density distribution is confined between two rigid planes by solving the linear MHD equations into normal mode. Some special cases have been particularized to explain the roles the variables of the problem play; numerical solutions have been made and some stability diagrams are plotted and discussed. The results show that, the growth rate depends on the horizontal and vertical components of magnetic field and also depends on the parameter λ*=λLD  (λ is constant and LD is the density-scale length). The maximum instability happens at λ*=-0.5 and to get more stability model we select λ* such that it is different than λ*=-0.5. The vertical magnetic field component have a greater effect than the horizontal magnetic field component in the case of large wavelength, while in the case of short wavelength, the horizontal magnetic field components have greater effect than the vertical magnetic field component.

System of Potential Barriers in Nanostructures  [PDF]
A. G. Gulyamov
World Journal of Condensed Matter Physics (WJCMP) , 2015, DOI: 10.4236/wjcmp.2015.52009
Abstract: Nanoscale superlattice has been investigated theoretically. It has been shown that the deformation effects on the energy spectrum of nanoscale superlattice by changing the interatomic distances as well as varying the width and height of the potential barrier. The potential deformation has been estimated. It has been shown that for different edges of forbidden bands the deformation potential has different values. It has been also analyzed the dependence of the effective mass on energy. It has been determined that the effective mass crosses periodically the zero mark. It has been concluded that this phenomena contributes to the periodic change of the oscillation frequency de Haas-van Alphen effect.
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