فهرست مطالب حسن نعناکار

Today, terrorism is a serious threat to all societies. The acquisition of nuclear weapons by these groups will pose serious problems for global security. Therefore, studying the methods of passive nuclear defense against nuclear attacks and predicting the direction of radioactive materials can increase the preparedness of society against such attacks and save the lives of many people. Numerous pieces of software have been developed to simulate the release of radioactive material from nuclear weapons and nuclear power plant accidents. The HYSPLIT model is one of the most efficient models in this field. This model has the ability to simulate meteorological with data from different centers. In this research, this model along with meteorological data (GDAS) has been used to simulate the release of radioactive material caused by the explosion of atomic bombs in north of Iran. In this simulation, it is assumed that the atomic cloud resulting from the explosion is composed of 13 particles of different sizes. The results show that the model is well able to simulate the direction of propagation and increasing the size of the bomb will increases the distance of propagation and has no effect on the direction of propagation. Small bomb simulations also give more consistent results.

Artillery weapons have an important role in low height artilleries. In the first step of these weapons, due to reach a stable and controllable projectile, aerodynamically, finding angle and the initial velocity are very essential. Until now, scientists have obtained these items by modelling based on ordinary differential equations. But, in this paper, fractional differential equations of the projectile motion, which are very efficient in artillery weapons and more compatible with nature, are introduced. Then some of its properties such as trajectory, range, flight time and maximum height are studied. In addition, an inverse projectile motion is considered, i.e., we consider a problem that we know the position of motion in a special time and then we obtain angle and the initial velocity. In this way, the shooting method is applied. This method is an efficient and applicable method for solving boundary value problems. Finally, in order to study the efficiency and accuracy of the method a numerical example is given.

In this paper, the use of quantum technology in the radar system and the advantages of these radars as compared to classical radars have been analyzed. In the beginning, briefly, we present the basic structure of the theory of quantum electrodynamics, and then the role of photon in this theory and photon interactions is presented.  In the next step, the most general form of the quantum radar cross section equation is extracted. This equation is also studied through a particle-type approach and introduces single-particle and two-particle illumination. Further, this equation is written in terms of Fourier transforms, since this method will pave the way for analyzing the cross-section of a quantum radar for defense purposes with various geometries. Finally, an analysis of the radar cross-sectional equation for flat panel geometry will be plotted, and computer simulations are carried out using MATLAB software, and finally, by comparing charts drawn from MATLAB software for classical and quantum radars, to analyze and compare them.