Research Publications

Academic theses and dissertations are regularly published and widely disseminated in YUOE Journal, Monographs, Universities Research Journal (URJ), Myanmar Academy of Arts and Science (MAAS) Journal, AsTEN Research Journal and International online Journals for sharing knowledge and contributing to the development of our education.

Myanmar Academy of Art & Science List of Research

No. Researcher Title Abstract Year
2381 May Thwe Soe and Myat Shwe Wah STRUCTURAL CHARACTERIZATION AND ELECTRICAL PROPERTIES OF ZnFe2O4 SPINEL FERRITE Zinc ferrite, ZnFe2O4, has been prepared by solid state reaction method at 1150 °C for 5 h in vacuum chamber (160 mmHg). Analar (AR) grade zinc oxide, ZnO, and ferric oxide, Fe2O3, were used to prepare and characterize for the sample. The as-prepared ZnFe2O4 sample was characterized by XRD methods. XRD pattern reveals that the sample belongs to spinel type cubic structure and the lattice parameters of the sample are obtained as a = b = c = 8.86 Å respectively. Crystallite size of the sample is also obtained as 46.06 nm. Variation of the electrical conductivity and dielectric constant with temperature were studied by electrical resistance and capacitance measurements. The electrical conductivity results show that the sample is a superionic conductor or fast ion conductor at high temperature (T ? 523 K). 2024
2382 Pwint Yi Thein , Ye Myint Win , Aye Thandar Twin , Nyo Nyo Myint and Yin Yin Swe BEHAVIOR AND FERROELECTRIC PROPERTIES OF LEAD TITANATE FILMS AS A GATE MATERIAL PbTiO3: Sr thin film devices are prepared by colloidal solution route at different Sr contents. Structural features of prepared samples are examined with the help of x - rays diffraction technique. From the x - rays spectra, lattice dimensions, such as lattice constants, lattice distortion, unit cell volume, crystallite size and lattice micro strain of prepared samples at different Sr contents are evaluated. It is obvious that, there are single phase, tetragonal, polycrystalline and perovskite - type PbTiO3 structure in prepared samples. FET behavior, known as drain and transfer characteristics of prepared samples are also studied. From the drain characteristic, operation of prepared samples is either enhancement mode or depletion mode is determined. It is obtained that; operations of prepared samples are enhancement mode and normally off nature. Maximum drain current threshold voltage and transconductance values are estimated from the transfer variations. Ferroelectric properties of prepared samples are characterized by using Sawyer - Tower circuit and ferroelectric parameters are investigated. It is known that, ferroelectric parameters (Ps, Pr and Ec) increase as Sr content increases in prepared samples. It might be due to strengthing of second order hybridization, caused by isovalent Sr2+ ions in prepared samples. It may be conclude that, our prepared samples are suitable for one transistor (1T) of FeRAM application. 2024
2383 Yin Min Thant , Aye Thandar Htay INVESTIGATION ON ENERGY LEVELS OF BOTTOMONIUM Energy levels of the bottomonium are determined by solving Schrödinger equation with Numerov method. In this paper, we solved the non-relativistic Schrödinger equation theoretically with screened potential that includes spin dependent terms in the potential. It was used to predict the bottomonium ?b’s (singlet S and D states), ?’s (triplet S and D states), hb’s (singlet P and F states) and ?’s (triplet P and F states). 2024
2384 Mono Zaw , Kyaw Kyaw , Nyein Wint Lwin , Than Zaw Oo INVESTIGATION ON ELECTROCHEMICAL PROPERTIES OF ELECTROCHROMIC TUNGSTEN TRIOXIDE THIN FILMS Electrochemical properties of electrochromic (EC) tungsten trioxide (WO3) thin films on the fluorine doped tin oxide (FTO) coated glass substrates have been studied. Different molar concentrations of WO3 precursor solution were sprayed on FTO glass substrates to synthesize amorphous and crystalline phase tungsten trioxide thin films by conducting different annealing temperature. From the different WO3 precursor concentrations, 0.05 M enabled to increase current densities of WO3 film. The present study indicated that the optimum processing condition of annealing temperature 400 oC and WO3 precursor concentration 0.05 M would produce the WO3 film with higher electrochemical current densities which is attributed to a higher crystallinity and lower band gap energy. In examining the electrochromic performance of WO3 film, its color is blue upon coloring and colorless upon bleaching and the coloration efficiency is 1.89 cm2C -1 in KI and 2.01 cm2C -1 in KCl electrolytes. The color change would be associated with the intercalation (deintercalation) of K+ ions. The diffusion of ions in the insertion/ extraction process thus play a role. The diffusion coefficient of WO3 film is observed to be quite high and is in the range of 1.1 – 1.4× 10-12 cm2 s -1 in both KI and KCl electrolytes. The higher electrochemical activity renders it as promising material for smart windows and energy saving applications. 2024
2385 Nay Min Hla , Aye Khaing Soe , Moe Sandar Than , Mono Zaw , Soe Ko Ko Aung , San Yu Swe EVALUATION OF BAND GAPS AND URBACH ENERGIES FOR ZnO THIN FILMS BY THERMAL EFFECT Zinc Oxide (ZnO) nanoparticles were synthesized by the sol-gel technique. As prepared ZnO thin films were deposited by spin coating method on different annealing temperatures at200 °C and 300 °C. Optical properties of ZnO thin films were investigated by Ultraviolet–visible spectroscopy (UV–VIS). Energy gaps were decreased from 3.27 eV at 200 °C to 3.18 eV at 300 °C with increasing temperature. On the contrary, Urbach energy was decreased from 180 meV (300 °C) to 92 meV (200 °C) due to effect of annealing temperature.This mainly comes from decreasing of interatomic spacing and the average potential energy by defects and imperfection of semiconductor materials. Hence, Lower Urbach energy and higher transmittance of ZnO nanoparticles thin film is suitable electron transport layer in low temperature processed for flexible perovskite solar cells 2024
2386 May Zin Oo, Kalyar Thwe ASSESSMENT OF HEAVY METALS CONCENTRATION IN WATER SAMPLES FROM MANDALAY CITY The objective of this paper is to investigate heavy metal concentration and water quality parameters of different water stations in Mandalay city. Water samples were collected from six different townships in Mandalay City. The selected water samples are currently used for human consumption at the Mandalay region of Myanmar. The study provides an assessment of the present status of the concentration of heavy metals (Cu, Fe, Mn, Pb and Zn) of the Mandalay urban area. The concentration of Cu, Fe, Mn, Pb and Zn were determined using Inductively Couple Plasma Optical Emission Spectroscopy (ICP-OES) techniques for heavy metal evaluation index (HEI). Concentration of heavy metals in the water samples from the study area were Fe>Mn>Zn>Pb>Cu. In order to risk levels of Heavy Metal Evaluation Index (HEI) was evaluated. According to the pollution index, 67% of water samples were good as reported by heavy metal evaluation index (HEI). 2024
2387 Pyae Wa Maung, May Saw Ohn INVESTIGATION OF NUCLEON SINGLE-PARTICLE ENERGY LEVELS IN 90Zr USING NUMEROV METHOD In this research work, nucleons single-particle energy levels of 90Zr have been investigated by solving non-relativistic Schrödinger equation within the framework of Numerov method. In this calculation, phenomenological Wood-Saxon potential has been applied and Coulomb interaction is taken into account for proton state investigation. Due to the effect of Coulomb repulsion the singleparticle energy levels of proton is higher than neutron. Moreover, 90Zr permits the application of Hartree-Fock Random Phase Approximation RPA based Skyrme effective nucleon-nucleon interaction KDE0v1, BsK1, SIII, SVII and SGOI. So, the calculated results were compared with two set parameters of Skyrme interaction: BsK1, SVII and available experimental data. The results were agreed with these two parameters and experimental data. 2024
2388 May Saw Ohn* LAMBDA SINGLE-PARTICLE ENERGY LEVELS IN La 139 ? BY USING NUMEROV METHOD In this research paper, the ? single particle energies and radial wave functions of La 139 ? have been investigated, by solving numerically Schrödinger equation with Numerov Method. The phenomenological Woods-Saxon central potential and Woods-Saxon potential including spin orbit term are used in this calculation. The root-mean square distances between ? and core nucleus La 139 ? were calculated with normalized wave function. In this calculation, ? single particle energy levels of La 139 ? are 1s1/2, 1p1/2, 1p3/2, 1d3/2, 1d5/2, 1f5/2, 1f7/2, 1g9/2, 2s1/2, 2p1/2, 2p3/2. This calculated results are agree with H.Bando calculated results and slightly different from experimental results. 2024
2389 Hnin Thidar Soe , Nanda Phone Lin Wai , Ei Thiri Khaing INVESTIGATION OF RADIOACTIVE ELEMENTS IN SEDIMENTS FROM THE AYEYARWADY RIVER BANK AT MAGWAY TOWNSHIP The radioactive elements contain in sediment of Ayeyarwady River Bank at Magway Township were determined by Gamma Ray Spectroscopy of HPGe Detector. The aim of this study is to determine the natural (238U, 232Th, 40K) radioactive levels in sediments collected from four different places in Ayeyarwady River Bank and also Raeq, DR and Hex will be calculated and compared with the recommended levels from UNSCEAR (2000) reports. The concentration of the natural radionuclide activity of 226Ra, 232Th, and 40K are 0.0456 Bqkg-1 , 14.1361 Bqkg 1 and 1.1639 Bqkg-1 were observed. These values are lower than the worldwide average value. The radiation hazard parameters of radium equivalent activity, absorbed dose rate and external hazard index for all samples are 20.3754 Bqkg-1 , 8.6079nGh-1 and 0.0549 mSvy-1 . These are not exceeded the maximum admissible limit. So, it can be assumed that the sediments are not hazard to the surrounding. 2024
2390 Aung Zaw Myint , Kyaw Soe Moe , Su Myat Aung , Nyunt Khat Khat Wai DESIGN AND CONSTRUCTION OF FOUR CHANNELS AUTOMATIC BLUETOOTH CONTROL SYSTEM In this work, four channels automatic Bluetooth control system is designed and developed. The system consists of the regulated power supply, Bluetooth module, relay drivers and Arduino microcontroller uno board. An Arduino which is an open-source microcontroller board can be controlled or programmed by the computer. The Arduino programming language is used to program Arduino board through serial communication. The firmware program on the Arduino board is controlled by the android application program on the smart phone. Totally, four channels’ appliances are controlled separately from the smart phone. 2024