Journal of Interface, Thin Film and Low Dimension Systems
Volume:5 Issue: 1, Summer-Autumn 2021

In this study, thermoelectric properties of the two sided-closed single-walled boron nitride nanotubes (TSC-SWBNNTs) are investigated. For this purpose, a nanotube with the chirality of (6, 3) is selected with no impurities. The energy is considered in the range of -5.5 to 5.5 electron volts and the investigations are performed at the temperatures 300, 500, 700 and 900K. The results show that increasing temperature results in significant reduction in the length of the bandgap. Besides, the peaks of the conduction diagram become smaller and their number decreases, indicating the return of more electrons and holes around the LUMO and HOMO bands, respectively, which leads to reduction of the bandgap and increase in the conduction. Moreover, the seebeck coefficient (thermal power) has increased to about 370 μV/K by increasing temperature to 900K. As the temperature increases, the coefficient of merit (ZT) increases to about 0.95, and it is expected to experience more increase with further increase in temperature. Thermal conductivity has also increased slightly with increasing temperature. However, the values of thermal conductivity are at the nanoscale. Therefore, in general, it can be concluded that the (TSC-SWBNNT) (6, 3) can be selected as a suitable thermoelectric material.

In the present work, the effect of roughness in resonant tunneling diodes have been considered to track two main goals. At first, the roughness impact on the transport through these heterojunctions has been studied, and then roughness type effect have been also investigated. For calculating the electrical transport, the transfer matrix technique has been used in simulations. Two different standard methods of deposition - Random deposition (RD), and Ballistic deposition (BD)- have been applied to generate two dissimilar rough interfaces. The scattering process cause to reduction of transport probability. The conductivity as a function of voltage has been also calculated. Effect of interface roughness on the peak-to-valley current ratio in the presence of roughness have been discussed. The results show that the scattering affect it significantly. As the applied voltage increase, at first, the value of current reaches to maximum amount, and then with increasing the voltage, the current falls in a negative differential resistance region.

The purpose of this article is to describe the relativistic corrections to the spectrum of bound states during hyperonization when interactions between quarks and gluons in the semi-quark-gluon plasma occur and then appear color decay and color transformation between particles. I will consider this issue, according to the asymptotic behavior of the loop function in the scalar external gauge field based on the quantum field. This opinion was formed and presented using the projective unitary representation method and technique (oscillator representation method) based on the Schrödinger equations converge toward the semi-relativistic equation and can take into account some relativistic effects of mass and interaction in a coupled system. Such calculations represent the interaction between the hyperon and the nuclei core when the quark-gluon plasma cooled down and we cannot see the free quarks and gluons, it occurs near the 150 MeV temperature in the quark-gluon plasma environment. The constituent mass and mass spectrum of hypernuclei presented with relativistic corrections. It is a new calculation and description of a coupled state of hadrons based on quantum field theory and the relativistic effect of interactions.

In this work, cadmium telluride nanoparticles were synthesized by sonochemical method and then thin films with the thicknesses about of 100 nm were deposited on glass substrates using thermal evaporation technique at a substrate temperature of 200 °C and vacuum pressure of 2×10-5 mbar. Sonochemical method is one of the best methods for synthesizing nanomaterials with very small particle sizes. After synthesis and deposition, the prepared films were subjected to x-ray diffraction, ultraviolet-visible spectroscopy and scanning electron microscopy to study the structure, optical properties and morphology of the films. XRD patterns indicated that the grown films were polycrystalline with a cubic structure on the preferred orientation (200).The size of the synthesized nanoparticles and crystallite size of the thin film grown on glass in the preferred orientation (200) were 16 nm &10.65 nm, respectively. Light absorbance spectra of nanoparticle and thin film obtained by UV-Vis spectroscopy at the wavelength range 600-1600 nm showed the increase of light absorption after deposition. The optical energy band gap was increased from 1.48 for nanoparticles to 1.51 for the deposited films. The SEM taken on the scale of 500 nm from nanoparticles and thin films showed the homogeneity and uniformity of both of them

The time delay between magnetic coil signals in a tokamak is believed to lead to inaccuracy in the measurement of the plasma physical parameters in the tokamak. In this research, we calculated the time delay between the signals of magnetic coils used in IR-T1 tokamak and investigated its effect on the measurement of the plasma horizontal displacement. The time delay between the signals of the magnetic coils was calculated utilizing time series analysis, and the horizontal displacement of the plasma was measured using the multipole moments method. The experimental results showed that by eliminating the time delay from the coil signals, the measurement of plasma horizontal displacement in IR-T1 tokamak was optimized.

The bound state of exotic gluons with a thermal background in the framework of the projective unitary representation in the physics model at high energy interactions has been investigated. The ground and excited states of gluonic systems to describe the temperature effect of the mass spectrum have been defined. The problem of calculating the mass spectrum of coupled states based on the QFT in its broadest sense is a technique, to detect and obtain reasonable objectives and goals. The aim of this paper is to present the possible use of symplectic space in Femto-dimensional bound states at a finite temperature within strong interaction. The results can be used for describing nonzero and zero temperature mass spectra of mesons and multigluon-bound states. The problem of determining coupled state masses based on the polarization function is examined in detail. The Hamiltonian of the interaction and the structure of the bound state with the Schrödinger equation within the color-confining potential and Debye mass at finite temperature is presented and then the mass spectrum of a glueball at high energy interaction is determined. The mass spectrum of a two-gluon coupled state is calculated. The results are presented in the figures and table.