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
391 Ei Ei Minn REAL-TIME AUDIO TRANSMISSION SYSTEM BASED ON VISIBLE LIGHT COMMUNICATION A simple prototype of an optical wireless audio system by using laser diode as a source for the transmitter has been proposed. In this project, we designed and implemented a wireless optical transmitter and receiver system that established an audio communication at some distances with weak signal via visible light communication. The wavelength that used for this project is 635 nm which is visible wavelength range. Based on the experimental results, the visible light communication system can work successfully within in distance up to 30 meters. This project is successfully improved the transmission distance and signal coverage area effectively with low cost of hardware, high communication speed and almost no limit to bandwidth. 2019
392 No No Htike COUPLED-CHANNELS ANALYSIS FOR HEAVY-ION FUSION REACTIONS OF 16O + AX SYSTEMS In this work, we have studied the fusion cross sections and fusion barrier distributions of heavy-ion collision at energy near and below the Coulomb barrier. The coupled-channels method has been applied to analyze the intrinsic characters of colliding systems. Firstly, we evaluate fusion cross sections for systems having different collective environments. Next, we calculate the fusion cross section and fusion barrier distribution for fixed projectile and different target (i.e., 16O + AX systems where the target has different intrinsic characters such as rotation and vibration). To this end, we compare the experimental fusion cross sections with those from calculations with and without coupling using the same potential parameters of the selected systems. The calculated results indicate the sensitivity of fusion cross sections on types of static and dynamic deformations. The results show that the coupled-channels calculations reproduce the fusion cross sections very well but barrier distribution deviate from the experimental results in the high energy region. 2019
393 Su Mon Myat IMPROTANCE OF TRANSFER CHANNELS IN SUB-BARRIER FUSION REACTIONS The role of neutron transfer is investigated in the heavy-ion fusion reactions of 40Ca+48Ca and 40Ca+124Sn systems by using coupled-channel method. The calculated fusion cross sections and barrier distributions are compared with the experimental data. The calculations are performed with the inclusion of vibrational coupling for target nuclei in both systems. The calculated fusion cross sections with channel couplings give better agreement compare with no-coupling calculations. But extracted barrier distributions still deviate from the experimental data. The Q-values of two neutrons transfer reactions 48Ca (40Ca, 42Ca) 46Ca and 124Sn (40Ca, 42Ca) 122Sn show 2.621 MeV and 5.410 MeV, respectively. The inclusion of neutron transfer channel in the calculations reproduces the experimental fusion cross sections and barrier distributions. 2019
394 Khin Sandar Khaing INVESTIGATION OF ENVIRONMENTAL POLLUTION IMPACTS ON RADON LEVELS AND ELEMENTAL CONTENTS IN AGRICULTURAL SOIL SAMPLES FROM MYINGYAN TOWNSHIP Environmental pollution impact is the most important issue of our time. Soil and water pollution, in particular, have historically impacted on food safety which represents an important threat to human health. In this research work, twelve agricultural soil samples collected from the four places of agricultural area of Photokephyu Village in Myingyan Township were analyzed scientifically for environmental pollution protection purpose. To estimation of the nuclear pollution, especially radon concentration, surface and mass exhalation rates, and effective dose were carried out by Solid State Nuclear Track Detection. The soil samples were determined by Energy Dispersive X-Ray Fluorescence Method for elemental concentrations quantitatively. The measurement results radon level found in this study were below the action level recommended by the ICRP. In EDXRF results, the toxic elements were not found in the samples. Results reveal that there is no significant public health risk from radon and elemental concentrations in the study region. The present investigation is useful from the health and environmental point of view. 2019
395 Zar Zar Myint Aung STUDY ON STRUCTURAL AND MAGNETIC PROPERTIES OF YTTERBIUM DOPED ZINC FERRITE PREPARED BY SOLID STATE METHOD Rare earth, ytterbium doped Zinc ferrites: Zn (YbxFe1-x)2O4 with x=0.0000, 0.0125, 0.0250, 0.0375 and 0.0500 were prepared by the solid state method. Effect of Ytterbium doping on structural and magnetic properties of Zinc Ferrite is reported. The phase formation of the prepared samples was analyzed by X-ray diffraction. The appropriate variations in lattice parameters and cell volume confirmed the successful substitution of Fe3+ ions with Yb3+ ions at octahedral sites. The bulk density (Db) and X-ray density (Dx) were also significantly varied by increased Yb3+ contents. XRD analysis reveal pure spinel phase in all the samples, without traces of secondary phases. The magnetic measurements were performed by using a soft magnetic Hysteresis Graphs Meter (DX-2012SD). It was found that saturation magnetic induction and coercivity followed decreasing trend with substation of Fe3+ ions by Yb3+ ions. 2019
396 Myat Shwe Wah STRUCTURE AND MAGNETIC PROPERTIES OF NANOCRYSTALLINE NiZnFe2O4 PREPARED VIA CONVENTIONAL CERAMIC METHOD Nanocrystalline Nickel-Zinc ferrite was synthesized by conventional ceramic method. The metal oxide of Ni, Zn and Fe were used as precursors for NiZnFe2O4. The structural characterizations were made for the samples with a chemical formula Nix Zn1-x Fe2O4 (x = 0.1, 0.3, 0.5 and 0.7mol). The obtained nanocrystalline Ni-Zn ferrite was analysed and discussed through structural, morphological and magnetic characterization. Formation of pure NiZnFe2O4 phase was confirmed by X-ray diffraction analysis (XRD). The determined material's nanocrystalline structure was additionally supported by scanning electron microscopy (SEM). The magnetic hysteresis loop was recorded by means of a Magnet-Physik(EP-3). 2019
397 Mar Mar Htay THEORETICAL INVESTIGATION ON ? (1405) RESONANCE WITHIN ??N FRAME WORK OF ??N- ?+ ?- COUPLED CHANNEL We calculated various range parameters and different strength parameters of ? (1405) with resonance state for +-+-? ?? ? ?. Firstly we solved Schrodinger equation by using separable potential for +-+-? ?? ? ? channel to obtain various differential cross sections with energies for various strength parameters and different range parameters. It is reduced the resonance state of +- ? ?. Secondly, we investigated the various strength and range parameters of seperable potential for ? (1405) resonance within KN frame work of KN +-? ? ? coupled channel. It is observed that the parameter sets of KN interaction can be constructed for +- ? ? resonance and K-p bound state. Therefore, we constructed the new model A and B for KN interaction. 2019
398 Thet Thet Naing PHOTOVOLTAIC PERFORMANCE OF MEH-PPV:PCBM POLYMER SOLAR CELLS WITH AN INTEGRATION OF ZINC OXIDE (ZnO) NANOPARTICLES The poly (2-methoxy-5-(2-ethyl hexyloxy)-1, 4-phenylenevinylene) (MEH-PPV) films were prepared by spin coating technique. Introducing additive (ZnO nanoparticles (ZnO-NPs) of size ~ 250 nm) and the optical properties of MEH-PPV polymer films were investigated by UV-vis spectrophotometry. Following the polymer film characterization, the organic solar cells using MEH-PPV based light absorber layer were fabricated and the effect of additive (ZnO-NPs) on the power conversion efficiency of the devices was investigated. The "dichlorobenzene" device outperformed the devices with other three rival solvents and its efficiency is as high as 0.112%. Despite having higher absorption in active layer with ZnO-NPs, the efficiency of this modified device underperformed the reference device (without ZnO-NPs) which is attributed to the restricted charge carrier transport and morphological perturbation. The additive concentrations have a strong impact on optical and surface morphological properties of the photoactive polymer films and thus on the photovoltaic performance of the devices. 2019
399 Yin Mar Aung SINGLE-PARTICLE ENERGY LEVELS OF EVEN-EVEN SILICON ISOTOPE In our research work, single particle energy levels of even-even silicon isotope 28Si are calculated by using the phenomenological Woods-Saxon central potential with spin-orbit interaction. The Gaussian basis wave function is also used in our calculation. The average values of kinetic energy, potential energy and centrifugal energy are calculated. The neutron separation energy and the root-mean-square radius of 28Si are also calculated. Our calculated shell spectra are similar as the prediction of the shell model. Moreover, the calculated last neutron separation energies are in good agreement with the experimental results. 2019
400 Khaing Pwint Wai CALCULATION OF POTENTIAL ENERGY SURFACES FOR LIGHT NUCLEI IN ?-? PLANE The nuclei having asymmetric shapes in their ground state have now become an interesting topic in both theoretical and experimental nuclear structure physics. In my present work, the deformations in neutron-rich light-mass nuclei are investigated by using self-consistent mean field approach. Using the constrained Skyrme Hartree-Fock+BCS method on the three-dimensional Cartesian mesh, we calculated the potential energy surfaces (PES) for some selected light nuclei (16O, 22Ne and 28Si) in ?- ? plane where ? represents ellipsoidal quadrupole deformation and ? , the degree of axial asymmetry. 2019