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
381 Zaw Shin SIMPLE ASTROPHYSICAL SIMULATIONS FOR COLLISIONLESS STELLAR SYSTEMS Simple astrophysical simulations for stellar systems which are assumed to be collision less have been studied using N-body simulation techniques. Physical entities such as potential-density pair profiles for the dark halo and stellar bulge have been simulated and some interesting remarks are given. 2019
382 Htwe Nwe Oo GRAVITATIONAL COLLAPSE IN SELF-SIMILAR SPACETIMES Attempts are made to give an alternative description of self-similar spacetimes which is proving to be very substantial and useful in astrophysics and general relativity. The metric for collapsing dust cloud is utilized in this formalism. The nature of gravitational collapse in self-similar spacetimes has been studied in detail and relevant physical interpretations of the results obtained are given. Some interesting results of the calculation have been visualized. 2019
383 Han Win Than AXION DARK MATTER, CP VIOLATION PROBLEM IN QCD Attempts are made to give a brief description of axion dark matter and its possible root from CP problem in strong interaction. First of all, the theoretical background of symmetry and symmetry breaking in particle physics have been reviewed in detail . Then, the role of Goldstone?s theorem, Goldstone?s bosons in Gauge theories are investigated. It has been shown that spontaneous symmetry breaking of gauge symmetry can be described by Higgs mechanism. The most popular solution to the CP problem in strong interaction : the addition of an additional symmetric field and its quanta- axion is presented. A rough estimate of the axion mass is also conducted using currently available constraints on QCD and quantum cosmology. 2019
384 San San Maw SIMPLE SIMULATIONS OF MAGNETOHYDRODYNAMICS IN STAR FORMATIONS Attempts have been made to implement simple simulations of MHD in star formations. Some simple and tractable numerical method is utilized to make the simulation more realistic and physically acceptable. Detailed coding are given in the Appendix. 2019
385 Zin Min Myat SYNTHESIS AND CHARACTERIZATION OF DYE-SENSITIZED SOLAR CELL BASED ON SILVER OXIDE NANOWIRES In this paper, silver oxide (Ag2O) nanowires grown onto ITO glass substrate from aqueous solution of silver nitrate (AgNO3) and sodium hydroxide (NaOH) were used in dye-sensitized solar cells. Ag2O nanowires were fabricated by using chemical bath deposition method at 300 °C and 400 °C for 1 h. Ag2O nanowires were fabricated by using chemical bath deposition method (CBD). Phase formation and crystal structure of silver oxide were characterized by XRD analysis. The surface morphology of silver oxide nanowires were examined by SEM. The prepared nanowires structures were dye-sensitized with dragon fruit and assembled into a dye-sensitizer. Absorption and transmission properties of extracted dyes and silver oxide nanowires were carried out with UV-Vis spectroscopy. The DSSCs were converted the energy in light absorbed by dyes or pigments into other form of energy. Conversion efficiency (?con) and fill factor (FF) were measured and determined by using I-V characteristics. Silver oxide (Ag2O) nanowires photo-electrodes with dragon fruit dye sensitizers for DSSCs exhibited the optimum values of conversion efficiency 0.67 % at 300 °C and 0.63 % at 400 °C at two temperatures and it might be dye to good performance of anthocyanin molecules. Photovoltaic properties of silver oxide (Ag2O) nanowires cells were measured and it was expected to utilize the dye sensitized solar cells applications. 2019
386 Nway Han Myat Thin CHARACTERIZATION AND DIELECTRIC PROPERTIES OF ZINC TITANATE (ZnTiO3) CERAMICS In this study, zinc titanate (ZnTiO3) was prepared by solid state reaction method using zinc oxide (ZnO) and titanium oxide (TiO2) in a molar ratio of 1:1. Three calcination temperatures (800?C, 900?C, 1000?C) at 2 h were selected to investigate the reaction of formation of zinc titanate (ZnTiO3). Structural properties of ZnTiO3 ceramics were characterized by X-ray Diffraction (XRD) technique. Scanning Electron Microscopy (SEM) technique was used to examine the surface morphology of ceramics. Frequency dependence of the dielectric properties of ZnTiO3 was measured by LCR meter. 2019
387 Thin Thin Kyu STRUCTURAL, MORPHOLOGICAL AND OPTICAL STUDIES OF ZINC OXIDE (ZnO) THIN FILMS PREPARED BY CHEMICAL BATH DEPOSITION TECHNIQUE In this study, Zinc Oxide (ZnO) thin films have been deposited by chemical bath deposition techniques on Indian Tin Oxide (ITO) glass substrate at 300oC and 400oC. Phase formation and crystal structure of Zinc Oxide thin films were studied by X-ray diffraction (XRD). Results of the Scanning Electron Microscopy (SEM)) were indicated the morphology of the sample surfaces. The optical band gap of Zinc Oxide thin films were studied by absorbent data using UV-Vis Spectrometry. 2019
388 Kyaw Thu ANALYSIS OF TIME OF FLIGHT OF 8HE NUCLEI IN NUCLEAR EMULSION USING RANGE-ENERGY RELATION PROGRAM A nuclear track emulsion (NTE) is exposed to 60MeV 8He nuclei. Measurements of decays of 8He nuclei stopped in nuclear track emulsion allow one to evaluate possibilities of alpha spectrometry. Thermal drift of 8He atoms is observed in nuclear emulsion. Knowledge of the energy and emission ranges of alpha particles allows one to derive the energy distributions of alpha decays Q2?. The presence of a tail of large values is established. Presented in this report is the time of flight estimate for 8He based upon data obtained from an emulsion stack exposed to 1.6GeV/c K- mesons. The lifetime of 8He is about 0.1 s and the decays of 8He were obtained in a total estimated time of flight of 8He (?8Li+?-, (?8Be+?-) 2.6±0.21 psec. The forward to backward ratio indicates isotropic emission of 8Be (or 8Li) fragments. The emission of short recoils at the primary vertex shows a definite correlation with the 8Be (or 8Li) fragments. 2019
389 Cho Cho San COMPARISON BETWEEN SINGLEPARTICLE ENERGY STATES OF C 12 ? AND C 12 6 Nucleon single-particle energy states in ordinary nuclei and ? single particle energy states in ?-hypernuclei are compared to study the role of ? particle in nuclear medium. So, we examined the single particle energy state in ?- hypernuclei C 12 ? and ordinary nuclei C 12 6 . In our calculation, in order to get the single particle energy levels of C 12 ? and C, 12 6 we used the phenomenological Woods-Saxon ?-core nucleus potential and nucleonnucleus potential including spin-orbit term. Gaussian basis wave function is used in our consideration systems. 2019
390 Khin Su Su Han INVESTIGATION OF NICKEL CONTAINED FROM SULFIDE ORE DEPOSIT SAMPLES IN NAMTU MINE AREA BY MEASURING HALF-LIFE OF COBALT-58 The half-life of nickel in sulfide ore samples was determined by using neutron activation analysis. In NAA method, the samples were activated by Am-Be (?,n) isotopic neutron source. Its strength is 550 mCi, average neutron energy is about 3 MeV and half-life is 432 years. After irradiation, the gamma radiation of the samples were collected and calculated by using GM (ST-360) counter. Since, the resulting half-life of the sample is 70 days, the possible reaction of nickel is confirmed as 58Ni (n, p) 58Co. The best choice is this nuclear reaction for ore sample. This reaction is confirmed by calculating the half-life of this reaction. 58Ni (n, p) 58Co is the best reaction because it has suitable energy and half-life. 2019