مجله فیزیک کاربردی
سال چهارم شماره 1 (پیاپی 6، بهار و تابستان 1393)

In this study، using the AdS/CFT correspondence we study screening length of the Quarkonium in the presence of t’ Hooft coupling corrections. We consider the effect of these corrections on the screening length when the plasma wind blowing in the direction perpendicular to the Quarkonium. It is shown that the screening length depends on these corrections. At the constant velocity، decreasing coupling leads to decreasing screening length.

In this the research nanostructured titanium dioxide thin films with different thicknesses have been deposited on ceramic and tiles by spray pyrolysis method. The growth mechanism، thickness and morphology of Nanostructures and also their crystal structure have been investigated by SEM images and by X-Ray diffraction pattern. Self-cleaning properties of nanostructured TiO2 have been examined through three experiments: 1) Decomposition and self-cleaning quality of cooking liquid oil’s smoke coated on TiO2 layer under visible light illumination. 2) Study of molecules decomposition process of thin layer from Methylene Blue with a concentration of 10mg/lit under sun light illumination by light reflection from surface at different wavelengths and times. 3) Hydrophilic properties of TiO2 thin film are measured by angle variation of the water drop contact under UV light illumination in different times. The results showed that smoky layer with contamination materials on ceramic surface coated by TiO2 nanostructure can be cleaned under moonlight illumination and ordinary conditions.

In this paper we have calculated the Ti2InC structure parameters such as lattice constants، bulk modulus and its derivative، compressibility، density of states and energy band structure. The calculations have been performed using Pseudopotential method in the framework of density functional theory based on PWscf by the Quantum Espresso package. The calculations are in good agreement with other results.

In this study the effect of input parameters of the EDM process including pulse on- time، pulse current and voltage on the output characteristics (material removal rate، tool wear ratio and surface roughness) in the machining AISI D6 tool steel has been studied. This study shows that increasing the pulse on time، material removal rate and the surface roughness are increased and the tool wear ratio is reduced. Also، based on obtained results by increasing pulse current، material removal rate، tool wear ratio and surface roughness are increased.

In the framework of continuum dielectric approximation، the surface optical (SO) phonon modes of a quantum wire of GaAs imbedded in a polar semiconductor GaxAl1-xAs have been investigated. Two branches of SO phonon modes were derived (SO1، SO2). When the wave vector، increases، the frequency of each SO modesis converged to the frequency of the single planar heterostructure

In this paper، we calculate the dicluster stopping power of a two dimensional electron gas based on the dielectric function formalism at high velocities and temperatures. The dielectric function is derived by using the method of moments in which the effects of correlation have been included، and from that we obtain the dicluster stopping power in terms of the inter-ion spacing for different values of coupling coefficient، degeneracy parameter and velocity of projectile. The results show that with decreasing the coupling coefficient or increasing the degeneracy parameter، the Friedel oscillations appear at shorter inter-ion distances and quickly damped at higher velocities. Also، it is found out that the stopping power of the system is proportional to the inverse of the dicluster''s velocity.