دکتر حمیدرضا البرزنیا

In this research, we use first-principles calculations based on density functional theory (DFT) to investigate the electro-optical performance of a three-dimensional T-carbon nanostructure. In addition to analyzing the dynamic and static stability of the optimized structure of the T-carbon unit cell, as new research, the electro-optical properties of T-carbon, under the effect of omnidirectional hydrostatic stress on the unit cell up to 9 GPa, were simulated by using computational codes. The obtained results indicate the acceptable performance of this nanostructure as a suitable optical absorbent material. This three-dimensional nanostructure can be used to design innovative components such as electro-optical sensors, light intensifiers, optical detectors, and organic perovskite solar cells.

 In this research, the electro-optical aspects of Tetra-Hexagonal-Carbon allotrope as a two-dimensional nanostructure under compressive buckling parameter based on density functional theory (DFT) with PBE-GGA full potential approximation method using simulation software and computational codes based on first-principles calculations have been investigated. The analysis of the results obtained from the calculations of the electronic properties of this nanostructure, such as the band gap and density of states (DOS) under buckling change, indicates that the energy band gap of this nanosheet as a direct band gap semiconductor with 1.61 eV, increases slightly under the influence of the compressive buckling factor and then decreases down to 1.11 eV by applying higher compressive buckling factors. The optical properties of this nanosheet have smooth and regular changes in the out-of-plane polarization, by applying compressive buckling conditions in the visible light spectrum. Also, according to the obtained results, an acceptable match between the electronic and optical properties of this two-dimensional nanostructure is observed, which indicates the correspondence of electronic and optical behaviors, which can predict this carbon nanosheet is a suitable material for designing electro-optical devices.

The conditions of ignition and burn of nuclear fusion fuel in the presence of impurities are one of the critical issues in the fuel pellets design. In this paper, the impurity effect of Au heavy nucleus on all ignition processes in non-equilibrium DT plasma using four temperature models in which the shape of photon energy distribution function effects photon temperature behavior has been investigated. This study investigates the negative effects of fuel impurity during hot spot formation and fuel ignition. The results of numerical calculations obtained from the simulation of all effective processes in ignition show that in the presence of these impurities, effective ion charge and as a result the bremsstrahlung radiation is increased, and eventually the fuel efficiency decreases.

This article proposes a hybrid method to calculate the frequency in the instantaneous frequency measurement (IFM) receivers. This method improves the frequency accuracy of the corresponding receiver by performing a process of effective and targeted signal operation can provide the basis for improving the efficiency of the intelligent function of all types of ground-based and air-based jammers. To efficiently process the output data of IFM discriminators and increase the accuracy of frequency measurement, instead of the previous methods that usually change the structure of the separator in the RF field, new ideas in the digital field such as minimum mean square error (MMSE) algorithm is used. In this research, using a special combined method based on the MMSE algorithm and related optimization, frequency accuracy with RMS error of 2.1582 MHz in 2 GHz bandwidth is achieved in IFM receivers.
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The spectrum of electromagnetic waves in ku band has a great impact on equipment and manpower. Many methods have been used to protect electronic equipment against this range of waves. In this paper, uniform and non-uniform cold plasma consisting of three rectangular layers is used. Each plasma layer has different parameters such as thickness, impact frequency, magnetic property, variable density and wavelength of radiation. The electromagnetic input wave with p polarization is considered at different angles in the ku band. By solving the wave equations and calculating the acceptance coefficient in single and triple plasma layers, the optimal value of total absorption and reflection is calculated. Then, using Mathematica software, the diagrams are drawn according to the parameters mentioned in the single-layer blade and the three-layer blade. Using these diagrams, the cop protection coefficient in single-layer and three-layer states is compared by considering consecutive reflections in magnetic and non-magnetic cases, and the desired results are presented. The results show that using three-layer plasma leads the cop coefficient to its optimum for high bandwidth.

In this article, new research is based on density functional theory (DFT), and simulation of first-principles calculations, to investigate the effects of vertical compressive strain on the properties of two-dimensional penta-graphene nanostructure. First, to validate this research's results, the structural and electronic properties of penta-graphene were investigated in the optimal state, and the results show a good agreement with previous research. Investigating the electronic properties of penta-graphene under the conditions of compressive strain indicates the change of the energy band gap from indirect to direct. Also, the examination of the optical properties of this two-dimensional nanostructure under compressive strain conditions shows the compatibility of this nanostructure's optical and electronic behaviors. According to the results obtained in this research, the two-dimensional nanostructure of penta-graphene can be introduced as a suitable material for the design of electro-optical devices.

In this paper, the optical properties of penta-boron carbide two-dimensional nanostructure (B2C) have been studied using simulations with computational codes based on density function theory based on initial calculations. The study of electronic properties shows that this two-dimensional nanostructure is an indirect semiconductor with an energy gap of 1.49 electron volts by the PBE approximation method. Study of optical properties of this nanostructure by PBE-GGA approximation method In addition to showing the agreement of optical aspects with the electronic properties of this two-dimensional monolayer, this nanostructure can in the future, as a suitable material in the design of electro-optical devices in industry Different to be used. According to the findings of this study based on the relatively high absorption rate and very low reflectivity of this nanomaterial in the visible spectrum, this nanostructure can be used for optical applications, especially in the design of solar energy devices and optical sensors with various applications in the defense industry.

In this study, quantum sensors and in particular quantum radars have been studied as one of the new technologies that can be used to significantly improve command and control systems. The concept of quantum entanglement and its application in quantum illumination technology in these sensors is considered as a quantum standard for improvement new command and control systems in the field of detection, data collection and reducing the limitations of common remote sensing tools. Also, the performance of quantum radars with non- entangled and entangled signals in quantum radars is compared and analyzed with the capabilities of classical radars, and the results are presented.

In this paper, a new two-dimensional nanostructure called germanium sulfur diphosphide (GeP2S) structure, in the framework of the Density Functional Theory (DFT) has been predicted. In addition to studying the static and dynamic stability; structural properties of this two-dimensional nanostructure have also been compared with similar previous structures. The research findings indicate the acceptable stability of the proposed monolayer. The electronic aspects of this monolayer in the optimal state have been investigated and presented by two methods of hybrid function approximation (HSE06) and generalized gradient approximation method (GGA-PBE). The study of electron properties of this proposed monolayer introduces it as an indirect semiconductor with an energy gap of 1.367 eV by the HSE06 approximation and 0.688 eV by PBE-GGA approximation method. Study of optical properties of this proposed nanostructure indicate the agreement of optical band gap with the electronic band gap of this two-dimensional monolayer, especially in the HSE06 approximation method. Based on the findings of this study, due to the relatively high absorption rate and very low reflectivity in the visible spectrum in the energy range of 1 to 5 eV, if this proposed nanostructure is synthesized can be considered suitable for optical applications, especially in solar energy devices.

Today, in organizations, information systems play a decisive role in strategic management, resource management, optimal performance of the organization, etc. Therefore, creating a real-time centralized management system on modern communication channels, including mainly data-oriented communication networks and online organizations to access central servers, requires a powerful sharing system. The proposed solution is a gateway that integrates the entry path and the application of service mechanisms to the users' demands through a single channel, which introduces the features of networked operating systems and the concepts and capabilities of cloud computing as a worthy solution. Also, the proposed solution brings integration at the level of the user interface and by using a platform as a service, it can play the role of a single unifying layer on the island devices of the organization. In the following, by reviewing the literature on the subject in several areas, we will discuss the basic concepts of information devices, cloud computing and web operating systems, and then we will review the works done in these fields. In the following sections, the approach used in the research is presented and then we present the proposed solution. Finally, the proposed solution is discussed and evaluated in the form of a case study and evaluated from the appropriate points of view, and the results of the research and future works are presented.

Electronic and optical properties of pentagonal GeS2 monolayer are investigated by first principles calculations in the framework of the density functional theory. The stability of the nanostructure is confirmed by cohesive energy calculation, as well as phonon dispersion calculation. The electronic properties simulation indicates that GeS2 monolayer is an indirect band gap semiconductor with a band gap of about 0.9 eV. Furthermore, the optical properties investigation reveals that the material exhibits a very low absorption and reflectivity in visible region of the electromagnetic spectrum. However, it has a considerable absorption and reflectivity in the ultra violet region. The results of this study, therefore, suggest that the considered structure has a good potential application in the  new generation of opto-electronic devices, especially as a UV protection layer.