Journal of Theoretical and Applied Physics (JTAP) Low-frequency electrostatic waves and chaotic motions in collisional superthermal plasmas Volume 17 (2023) JTAP Issue 4, September & October 2023 2023 11 17 Low-frequency electrostatic waves and chaotic motions in collisional superthermal plasmas 10.57647/J.JTAP.2023.1704.45 EN Mostafa Mehdipoor Department of Physics, Faculty of Science, Gonbad Kavous University, Gonbad Kavous, Iran 0000-0001-8524-8248 Yaghoob Mohammadmoradi Department of physics, Aliabad Katoul Branch, Islamic Azad University, Aliabad Katoul, Iran 0000-0001-6462-0653 Journal Article 2023 11 17 In this work, the dynamics and chaotic behavior of ion-acoustic (IA) traveling waves in a collisional plasma consisting of cold ions, superthermal electrons, and immobile neutral particles are studied. The effect of ion-neutral collisions is also considered here. Using the reductive perturbation technique, a forced modified Korteweg-de Vries (FMK-dV) equation is obtained in the presence of an externally applied force. The periodic, quasi-periodic, and chaotic motions of IA waves are investigated by considering three-dimensional phase portraits and time-series analysis. It is noted that ion-neutral collisional frequency, strength, and frequency of the external periodic force play an important role in controlling the dynamic motion of ion-acoustic waves. Moreover, it is found that the strength of the external perturbation can be considered as the main parameter for the transition from quasi-periodic motion to chaotic motion.

Journal of Theoretical and Applied Physics (JTAP) Exploring elastic mechanics and radiation shielding efficacy in neodymium(III)-enhanced zinc tellurite glasses: A theoretical and applied physics perspective Volume 17 (2023) JTAP Issue 4, September & October 2023 2023 11 17 Exploring elastic mechanics and radiation shielding efficacy in neodymium(III)-enhanced zinc tellurite glasses: A theoretical and applied physics perspective 10.57647/J.JTAP.2023.1704.44 EN Hesham M. H. Zakaly Department of Physics, Faculty of Science, Menoufia University, Shebin El Koom, Egypt Istinye University, Faculty of Engineering and Natural Sciences, Computer Engineering Department, Istanbul, Turkey Institute of Physics and Technology, Ural Federal University, Yekaterinburg, Russia 0000-0002-7645-9964 Yasser S. Rammah Department of Physics, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia. Shams A. M. Issa Department of Basic and Applied Science, Collage of Engineering and Technology, Arab Academy of Science, Technology and Maritime Transport, Smart Village, Giza, Egypt. Nouf Almousa Physics and Mathematical Engineering Department, Faculty of Electronic Engineering, Menoufia University, Menouf, Egypt. Adel M. El-Refaey Department of Basic and Applied Science, College of Engineering and Technology, Arab Academy of Science,  Technology and Maritime Transport, Smart Village, Giza, Egypt Mohamed Said Shams Physics and Mathematical Engineering Department, Faculty of Electronic Engineering, Menoufia University, Menouf, Egypt Journal Article 2023 11 17 The present work scrutinizes the radiation protection features and mechanical characteristics of neodymium zinc-tellurite of composition [(TeO2)70-(ZnO)30]1-x –(Nd2O3)x: x= 0-5 mol% in steps of 1 (TZNd1 – 5). The Makishima–Mackenzie's model was adopted for the computation of the Poisson's ratio (PR) and elastic moduli. WinXcom and EXABCal software's were performed to evaluate the radiation shielding parameters and buildup factors, respectively of TZNd-glasses. Results revealed that the increasing of Nd2O3 concentration in TZNd-glasses from 1 to 5 mol% had a positive effect on their elastic parameters: Young's modulus increased from 53.13 to 54.81GPa, bulk modulus changed from 31.95-33.65 GPa, and the PR varied from 0.222 to 0.228 for TZNd1 to TZNd5. There was a small increase in the Z/A as the Nd content increased, which leads to slight increase in TMSP of the particles. The mass attenuation coefficient increased in the order TZNd1< TZNd2< TZNd3 < TZNd4 < TZNd5. The maximum value of LAC obtained at 15 keV were 246, 249, 253, 257, and 260 cm-1 for TZNd1, TZNd2, TZNd3, TZNd4, and TZNd5, respectively. The HVT varies inversely with the linear attenuation coefficient. Throughout the considered energy spectrum the range of   for the glasses varied from 22.65 – 40.22, 22.64 – 40.25, 22.64 – 40.29, 22.63 – 40.32, and 22.63 – 40.36 for TZNd1, TZNd2, TZNd3, TZNd4, and TZNd5, respectively. The values of fast neutron removal cross section  showed a steady increase as the partial densities of Nd and oxygen of the TZNd-glass systems increased. Generally, one can conclude that the additive of Nd2O3 to TeO2-ZnO glasses leads to enhance their mechanical properties and increase their ability to absorb neutron and photon to apply in nuclear medicine applications.

Journal of Theoretical and Applied Physics (JTAP) Role of dust on the gradient driven instability in an E×B plasma Volume 17 (2023) JTAP Issue 4, September & October 2023 2023 11 17 Role of dust on the gradient driven instability in an E×B plasma 10.57647/J.JTAP.2023.1704.43 EN Munish Munish Department of Physics, Gargi College, University of Delhi, Delhi, India Plasma Science and Technology Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India 0000-0003-4258-5222 Dimple Sharma Plasma Science and Technology Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India Babu Lal Department of Physics, Swami Sharaddhanand College Alipur, University of Delhi, India. Sukhmander Singh Plasma Waves and Electric Propulsion Laboratory, Department of Physics, Central University of Rajasthan, Ajmer, Kishangarh- 305817, India 0000-0002-6761-1303 Journal Article 2023 11 17 The E*B plasma systems play an important role in the technologies like electric space propulsion and magnetized plasma sources used in plasma material interaction / surface processing. However, due to the gradient in plasma density, collisions and external fields such systems become prone to the instabilities and also dust particles are generated during the plasma processing. Hence, this article discusses the growth of gradient driven instability in a cross-field plasma, where both the ions and the electrons are magnetized and dust particles also exist. Using the fluid approach, we write basic equations and then derive an equation in terms of perturbed potential. The unperturbed part of this equation leads to the dispersion equation which is solved numerically for obtaining the growth rate of the instability. The normalized form of the growth rate is investigated in greater detail under the effect of dust density, dust mass, dust temperature, external magnetic field, ion temperature and ion temperature gradient.

Journal of Theoretical and Applied Physics (JTAP) Phase transformation; structural and optical properties of two dimensional MoO3 Volume 17 (2023) JTAP Issue 4, September & October 2023 2023 11 17 Phase transformation; structural and optical properties of two dimensional MoO3 10.57647/J.JTAP.2023.1704.42 EN Mohammad Reza Khanlary Department of Physics, Imam Khomeini International University, Qazvin, Iran. 0000-0003-1499-853X Azita Keshavarz Department of Physics, Imam Khomeini International University, Qazvin, Iran. 0000-0003-1607-6037 Reza Shakouri Department of Physics, Imam Khomeini International University, Qazvin, Iran. Milad Parhizkari Department of Physics, Imam Khomeini International University, Qazvin, Iran. 0000-0003-4599-3846 Journal Article 2023 11 17 Thin-layered materials from transition-metal dichalcogenides family and their preforms such as molybdenum three oxides (MoO3) exhibit great potential as active material in optoelectronics. Stable materials of few atoms thick have shown emerging capabilities in this area. In this article, we report the synthesis of MoO3 nanostructures by spray pyrolysis method. We will, perhaps for the first time, show that by varying the hot plate temperature from 350 to 4400C, a phase transformation reveal from h-MoO3 to α-MoO3. By annealing the prepared α-MoO3 sample a preferential orientation of (002) crystal plane is induced. A large band gap of 2.8 eV for the prepared MoO3 film was obtained from the transmission spectra. The Raman vibrational modes were investigated for excitation wavelength at 532 nm using MoO3 films and for a heterostructured MoO3/MoS2 film .Better crystallinity and decrease in defects intensity, as an advantage of MoO3 hybridization can be achieved by proper fabricating the heterostructure sample.

Journal of Theoretical and Applied Physics (JTAP) Approximate solutions of the Dirac equation with Deformed Woods-Saxon potential including a Hellmann like tensor interaction Volume 17 (2023) JTAP Issue 4, September & October 2023 2023 11 17 Approximate solutions of the Dirac equation with Deformed Woods-Saxon potential including a Hellmann like tensor interaction 10.57647/J.JTAP.2023.1704.41 EN Uduakobong S. Okorie Department of Physics, Akwa Ibom State University, Ikot Akpaden, Nigeria 0000-0002-5660-0289 Akpan N. Ikot Department of Physics, Theoretical Physics Group, University of Port Harcourt, Choba, Nigeria 0000-0002-1078-262X Monday E. Udoh Department of Physics, University of Uyo, Uyo. Nigeria. Sylvester A. Ekong Department of Physics, Akwa Ibom State University, Ikot Akpaden, Nigeria Collins O. Edet Department of Physics, Cross River University of Technology, Calabar, Nigeria Ridha Horchani Department of Physics, College of Science, Sultan Qaboos University, Al-Khod, Muscat, Sultanate of Oman Gaotsiwe J Rampho Department of Physics, University of South Africa, Florida 1710, Johannesburg, South Africa Journal Article 2023 11 17 An Approximate bound state solutions of the Dirac equation under the spin and pseudospin symmetries for the deformed Woods-Saxon potential with a Hellmann-like tensor interaction was examined. With the help of the Nikiforov-Uvarov functional analysis (NUFA) method and an approximation scheme, the analytical and numerical energies of the combined potential were obtained for both symmetries, for different quantum numbers. Degeneracies were observed in the energy values in the absence of the tensor interaction and these degeneracies were removed with the help of the Hellmann-like tensor interaction. The variations of the energies for spin and pseudospin symmetries were studied for various values of the quantum numbers and deformation parameters. Our study shows that the relativistic energies obtained are very sensitive to the quantum numbers and the deformation parameter.

Journal of Theoretical and Applied Physics (JTAP) Quantum mechanical treatment of Shannon entropy measure and energy spectra of selected diatomic molecules with the modified Kratzer plus generalized inverse quadratic Yukawa potential model Volume 17 (2023) JTAP Issue 4, September & October 2023 2023 11 17 Quantum mechanical treatment of Shannon entropy measure and energy spectra of selected diatomic molecules with the modified Kratzer plus generalized inverse quadratic Yukawa potential model 10.57647/J.JTAP.2023.1704.40 EN Etido P. Inyang Department of Physics, National Open University of Nigeria, Jabi, Abuja, Nigeria 0000-0002-5031-3297 Ituen B. Okon Department of Physics, University of Uyo, Uyo, Nigeria Fina O. Faithpraise Department of Physics, University of Calabar, Calabar, Nigeria. Eddy S. William Theoretical Physics Group, Department of Physics, School of Pure and Applied Sciences, Federal University of Technology, Ikot Abasi, Nigeria. Peter O. Okoi Department of Physics, University of Calabar, Calabar, Nigeria. Efiong A. Ibanga Department of Physics, National Open University of Nigeria, Jabi, Abuja, Nigeria Journal Article 2023 11 17 In this research, we have obtained the energy eigenvalues and the corresponding normalized eigenfunction for the linear combination of the modified Kratzer and generalized inverse quadratic Yukawa potential using two different analytical methods: the exact quantization rule and the formula method respectively. The obtained normalized wave function is used to study the Shannon entropy in position and momentum spaces for the ground and first excited states. It was observed that the Shannon entropy in position space decreases as the screening parameter is increased and also increases in momentum space as the screening parameter is increased in such a way that their sum satisfies the Bialynicki-Birula-Mycielski (BBM) inequality that stipulated lower bound state of Sr+Sp>D(l+In(pi)) . Numerical results were generated for some selected diatomic molecules such as N2, CO, NO, and CH which agreed with other works in the literature. The content of this research finds application in atomic and molecular physics, quantum chemistry, and physics.

Journal of Theoretical and Applied Physics (JTAP) Investigation of MHD instabilities in tokamak plasmas Using biorthogonal decomposition of Mirnov coil data Volume 17 (2023) JTAP Issue 4, September & October 2023 2023 11 17 Investigation of MHD instabilities in tokamak plasmas Using biorthogonal decomposition of Mirnov coil data 10.57647/J.JTAP.2023.1704.39 EN Habib Mehrniya Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, P.O. Box: 14665‑678, Tehran, Iran Mohammad Kazem Salem Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, P.O. Box: 14665‑678, Tehran, Iran 0000-0002-8810-1820 Ahmad Salar Elahi Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, P.O. Box: 14665‑678, Tehran, Iran Journal Article 2023 11 17 Spatiotemporal signal analysis is essential in investigating magnetic fluctuations of tokamak plasmas. Signal analysis of Mirnov coils through biorthogonal decomposition (BD) can reveal the spatial structure and time evolution of magnetohydrodynamic (MHD) instabilities in a tokamak. This technique is comparable to singular value decomposition in terms of formulation. The present study calculates the probability of instability modes' presence and identifies the dominant modes using the method above. Moreover, the relationship between the singular value entropy as a signal characteristic and magnetic field oscillations of Mirnov coils in the IR-T1 tokamak is investigated. This study evaluated the presence of active modes with and without applying a resonant helical field. The results indicate that when L=2 and L=3 are applied independently, the probability of m=2 & 3 active modes is greater than when the resonant helical field is absent. In contrast, by combining these two, the likelihood of the presence of these modes is reduced.

Journal of Theoretical and Applied Physics (JTAP) Optical imaging and magnetic field simulation of a DC circular planar magnetron sputtering discharge Volume 17 (2023) JTAP Issue 4, September & October 2023 2023 11 17 Optical imaging and magnetic field simulation of a DC circular planar magnetron sputtering discharge 10.57647/J.JTAP.2023.1704.38 EN Ahmad Reza Rastkar Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran Ali Reza Niknam Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran 0000-0002-1460-7677 Mostafa Salahshoor School of Physics, Iran University of Science and Technology, Tehran, Iran Journal Article 2023 11 17 In this paper, the optical images of glow discharge plasma and the finite element method simulation of the magnetic field strength in a balanced and two types of unbalanced DC circular planar magnetron sputtering sources are presented. The investigation showed that wherever the magnetic field strength is stronger, the intensity of light and the ionization are greater and consequently, the deposition is higher. The comparison of recorded optical images with the finite element simulation results of the magnetic field strength indicated the correlation between regions of high magnetic field strength and high light emission.

Journal of Theoretical and Applied Physics (JTAP) Characterization of RF-driven atmospheric pressure plasma micro-jet plume Volume 17 (2023) JTAP Issue 4, September & October 2023 2023 11 17 Characterization of RF-driven atmospheric pressure plasma micro-jet plume 10.57647/J.JTAP.2023.1704.37 EN Davood Hassanpour Advanced Plasma Laboratory, Faculty of Physics, University of Tabriz, Tabriz, Iran 0000-0003-1010-2775 Sayyed-Jalal Pestehe Advanced Plasma Laboratory, Faculty of Physics, University of Tabriz, Tabriz, Iran 0000-0003-3224-4600 Journal Article 2023 11 17 The plasma parameters of an RF-driven plasma microjet in different applied RF powers, different positions from the outlet nozzle, and various argon flow rates are investigated. A double Langmuir probe is designed and constructed, then, the electron temperature, ion density, and saturation currents along the microjet axis at different positions such as top, mid, end and out of the microjet are measured. To avoid the collision, sparking, and corrosion effects, in high pressure plasmas, on the characteristic curve, the double Langmuir probe was reciprocated linearly perpendicular to the plasma jet with a frequency of 20 Hz. The four frequently used methods of the direct fitting of the theoretically obtained formula, double slope, turning point or Dote, and cutting or intercept method are explained and used to determine the electron excitation temperature from the experimental data and shown that they lead to similar results, so, the averaged value of these results used in the evaluations of plasma densities. The plasma number density and electron temperature were measured using DLP in the jet at different axial locations. The results for the electron excitation temperature from the DLP is compared with that of obtained from the emission spectrum of the plasma jet. It has been shown that the averaged electron excitation temperature obtained using optical emission spectroscopy (1.58eV) is within the 25% of that measured by the double Langmuir probe which is same as the early reported value by other researches.

Journal of Theoretical and Applied Physics (JTAP) The quantum fluctuations of charge and current in a driven nonlinear LC-circuit with a linear capacitor and a nonlinear inductor Volume 17 (2023) JTAP Issue 4, September & October 2023 2023 11 17 The quantum fluctuations of charge and current in a driven nonlinear LC-circuit with a linear capacitor and a nonlinear inductor 10.57647/J.JTAP.2023.1704.36 EN Ameneh Zamani Department of Physics, University of Qom, Qom, Iran Hasan Pahlavani Department of Physics, University of Qom, Qom, Iran 0000-0002-8784-3240 Journal Article 2023 11 17 A nonlinear soft-core ferrite (ferromagnetic material) inductor that obeys of a polynomial current-magnetic flux relationship (typically a power series in the magnetic flux) is introduced. The quantum Hamiltonian of a nonlinear LC-circuit consisting of a linear capacitor and a nonlinear inductor under the influence of an external field is found. The energy spectrum is obtained and the quantum behavior of the nonlinear coefficients is studied numerically. The quantum fluctuations of electric charge and current are obtained as a function of the characteristic parameters then the time-dependent of the characteristic parameters and the digger squeezing is analyzed by numerical approach.