International Journal of Engineering and Applied Physics

The Study of Simulation of RC, RL and RLC Circuits Using Matlab in Teaching

Hassan asnaoui — 2024-06-14

Involvement of simulation in teaching is provide a batter support, more clear and visual operation of complex circuits to the Faculty members of electrcs circuits in classroom teaching. The simulation available for simulation of electrc circuits are MATLAb and C+ and many more. Use of the simulation in classroom teaching is provide an additional support to the Faculty members and its better then the time consuming black board practice. This paper provides a case study of electrcs circuits as RC, RL and RLC in Matlab software. Different electrcs circuit model are prepared on Matlab software and generate simulation voltage forms. This paper is helpful for to find the applications of Matlab in teaching.

Radiological Assesment of Natural Radioactivity Levels in Selected Ceramic Tile Brands used in Kenya

James Mugambi Linturi — 2024-06-14

The assessment of the radiation levels of the natural radionuclides ²³²Th, ²³⁸U and ⁴⁰K in ceramic tiles used in Kenya has been studied. The radiometric analysis was done using a high-efficiency gamma-ray spectrometer. A total of thirty-seven (37) samples of ceramic tiles were pulverized, weighed accurately, and packaged in 250ml standard plastic containers, well labelled and stored for 28 days to attain secular equilibrium. Analysis of specific gamma energies from activities of ²³²Th, ²³⁸U and ⁴⁰K reported activity of 53.73±2.34 Bqkg^-1, 43.17±3.40 Bqkg^-1, and 525.99±36.10 Bqkg^-1 respectively. The variatiations in the radiation activity concetration is attributed to the composition of geological raw material used for tiles manufacturing. The average radium equivalent, absorbed dose, indoor and outdoor annual effective dose, and hazard indices (internal and external) obtained were 159.59 BqKg-1, 75.55nGyh^-1, 0.28, 0.19, 0.54 and 0.43 respectively. The results obtained from the study showed that the use of ceramic tiles in Kenya does not pose any significant harmful radiation effects to users.

Electronic and Structural Properties of an Undoped Sodium Iodide

Solomon Tahiru Tonga — 2024-06-14

This work investigated the electronic and structural properties of sodium iodide using the Density Functional Theory (DFT) method implemented in the quantum espresso code. The GGA (PBE) functional with exchange correlation was used. Convergence test for the kinetic energy cut-off, k-point and lattice parameter was carried out and the parameter generated was found to be consistent with the crystallography open data base input file of the sodium iodide. Band structure was plotted, and band gap was calculated to be 3.87 eV which was found to be in the category of a semiconductor but with high resistivity and low resolution. The plot of density of state was revealed that electrons may be scarcely found within some state in the sodium iodide crystal. The research shows that sodium Iodide can be effective as a semiconductor in the presence of dopants e.g., thallium which is often used in a radiation detection.

Gamma Radiation Effects on The Performance of The CdSe Thin Film for Photodetector Application

Zainab Hammo — 2024-06-15

Cadmium Selenide thin films were deposited on glass substrates and p-type silicon substrates using pulsed laser deposition technique (Nd: YAG laser). Some of these samples were exposed to different intervals (10,20,30,40) days of gamma radiation using a ²²⁶Ra source emitting 186 KeV ?-ray. For comparison purposes, the other diodes were kept without any irradiation. Results have shown all these thin films exhibit a hexagonal structure. However, there is a new (102-SiO₂) peak appeared in the irradiated thin film pattern. The crystallite size of pristine and irradiated CdSe thin films were (26.9,25.8,28.4,35.3 and 22.2) nm respectively, whereas the average grain size of the pristine film was (112.3-29.24) nm whereas for the irradiated films (45.58-33.72) nm, (61.16-42.8) nm, (55.7-36.03) nm and (53.31-43.45) nm. Results also show that the band gap increased from 2.17eV for pristine thin films to 2.28, 2.45, 2.2, and 2.28 eV for the irradiated thin films. also, I-V characteristics show the dark current decreases for the irradiated thin films. The forward current under illumination increases when exposed to small gamma radiation values and then decreases with higher exposure values. In contrast, the reverse current increases with the irradiation.

Solving Problem of Robotic Control of Advanced Missile Via Integral GuptaTransform

Rahul Gupta — 2024-06-15

A new technique has been brought into play in this article for solving the second-order linear differential equation representing the problem of automatic or robotic control of advanced missiles. The problem of robotic control of the Advanced missile is one of the problems represented by second-order linear differential equations. The Integral Gupta transform (GT) has not at any time been put in an application to solve the problem of robotic control of the advanced missile. In the article, Integral Gupta transform (GT) has been brought into play to solve the problem of robotic control of the advanced missile and reveals that it is a constructive tool for solving such problems. The graphs of the solutions obtained are plotted to indicate the generality and clarity of the proposed method.

Transverse deflection of sandwich beam with 2D-FG skins and ceramic core

Lan Hoang That Ton — 2024-06-21

The transverse deflection of a simply supported/clamped (SS/CC) sandwich beam with two directional functionally graded (2D-FG) skins and a ceramic core, namely SW2DC, is given under uniform load. The finite element analysis based on Matlab software is applied to survey the influences of material properties on deflections. The results are then shown and compared with other results in the references to end this study.

The Study of the evolution of certain electrical properties of a carboxymethyl cellulose by irradiating it and adding different concentrations of materials at different temperatures

Najla Ali — 2024-06-21

There are two parts to this manuscript. In the first part, thin films were prepared by doping carboxymethyl cellulose with Polyanionic cellulose low viscosity, with a concentration of 73% CMCHV and 27% PACLV, then CMC HV/PAC LV thin films were exposed to different X-ray photon doses (0, 200, 400, 600, and 800 cGy). But second Part were prepared the thin films by dissolving 8 g of CMCHV in 50 ml of distilled water, then adding NaCl and ZnONPs in concentrations (0.00, 11, 20, 27, 33 and 38%). The intensity of the direct current I was measured for all samples by changing the potential difference V at different temperatures (T).

The measurement results of all samples studied in this research indicate that the conductivity and current density increase with an increase in the X-ray photon doses in the irradiated samples or with an increase in the concentrations of NaCl, ZnOPNs and also increases with increasing temperature, but the conductivity and current density increase more when NaCl is added than when ZnO PNs are added. By using these results, several areas can benefit, such as industry, scientific research, etc.