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
801 Hla Myat Thandar STUDY ON THE DIFFERENTIAL SCATTERING CROSS SECTION FOR NEUTRON-CARBON (n-12C) NUCLEUS WITH EIKONAL APPROXIMATION The purpose of this work is to predict the differential cross sections of neutron-carbon (n-12C) nucleus in the frame work of Eikonal approximation. The differential cross sections of neutroncarbon nucleus are calculated by using Wood-Saxon potential. The projectile neutron kinetic energy ranged from 65 MeV to 95 MeV by increasing 10 MeV while the scattering angle varied 0° to 30°. The calculated results are in good agreement with the experimental results for energies, 65 MeV and 75 MeV. They are quite different for 85 MeV and 95 MeV. 2020
802 Cho Cho Win CALCULATION OF ENERGY LEVELS AND WAVE FUNCTIONS FOR A QUANTUM DOT Quantum dot is a nano-scale particle that is confined to the semiconductor as an exciton. The behavior of an exciton in quantum dot has the similar manner as a particle in a box (PIB). It is an individual quantum system which can be analyzed by Schroedinger equation. In this paper, Numerov technique is also used to solve the Schroedinger equation and the results are compared with analytical solutions. 2020
803 San San Maw A NUMERICAL RELATIVITY APPROACH TO BRANEWORLD COSMOLOGY Due to the non-linearity and the complexity, it is not very realistic to study the full dynamics in closed form, especially the behaviour at high energy regime where the fields are so strong that perturbation methods do not apply. Therefore, it is simply here needed to use a numerical approach. A simple finite difference method has been utilized to solve non-linear wave equation in flat 3+1 dimension space time under axisymmetry with source term f in Braneworld. Interesting results have been obtained and they are visualized in 2-D and 3-D. 2020
804 Moe Moe Myint SOLAR PHOTOVOLTAIC POWER MEASURING SYSTEM UTILIZING PIC MICROCONTROLLER Solar photovoltaic power measurement systems are important to investigate. Studying the environmental condition of a solar panel will help to improve efficient power collection with a faster rate. Solar panel converts photonic energy into electrical energy. But the conversion speed and properties depend on the type and size of solar panels. Moreover, the current and voltage of the solar panel is also related with luminous, and temperature exerted on it. The circuit is designed to investigate the voltage, current, luminous and temperature of a solar panel. The results will be displayed on an alphanumeric liquid crystal display. The whole system design include an 8-bit PIC microcontroller, an alphanumeric liquid crystal display, a crystal oscillator, a current detector circuit, a voltage divider circuit, a temperature sensor, light intensity sensor circuit and a regulated power supply. A program source code is created to operate the whole circuit. It is converted to machine code and loaded into the memory of PIC microcontroller. The whole circuit is constructed on a printed circuit board. Data collections were made for the circuit to proof the efficiency of various solar panels. 2020
805 Saw Thiri STRUCTURAL DEPENDENCE OF SILVER NANOWIRES ON DIFFERENT MEDIATED SALT Silver nanowires (AgNWs) has been synthesized by polyol process through different mediated salts such as Copper II Chloride (CuCl2), Sodium Chloride (NaCl), Potassium Chloride (KCl). The presence of cations and anions (Cu (II)+, Na+, K+ and Cl- ) makes strong impact on the shape of silver nano structures. The surface morphologies and crystallinity of silver structure are analyzed by Scanning Electron Microscopy (SEM) and X- Ray Diffraction (XRD). SEM results revealed that the diameter and length of silver nanowires. XRD pattern displayed the final product was highly crystallized and pure. The synthesis of silver nanowires is important to achieve high performance transparent conductive films. 2020
806 Su Myat Aung FABRICATION OF DYE-SENSITIZED SOLAR CELL BASED ON ZINC OXIDE NANORODS Zinc oxide nanorod with hexagonal structure was achieved by using chemical bath deposition method under atmospheric pressure by using zinc nitrate hexahydrate [Zn(NO3)2.6H2O] and hexamethylene-tetramine (C6H12N4) at constant temperature 93ºC and the deposition time of 2 hours, 4 hours and 6 hours. The prepared film was grown on the surface of zinc oxide seed layer. The surface morphologies and the structural characterization of zinc oxide (ZnO) nanorods were characterized by Scanning Electron Microscope (SEM) and X-ray Diffraction (XRD) technique. The XRD pattern of the sample revealed that ZnO nanorods have hexagonal crystallite structure. Photovoltaic parameters such as short circuit current density Jsc, open circuit voltage Voc, fill factor FF, and overall conversion efficiency ? for the fabricated cells were determined under illumination. In the analysis of photoelectrochemical properties, ZnO DSSC showed more pronounce in their performance and it has the efficiency of 0.12%. 2020
807 Tun Lin Htet SURFACE PLASMONIC EFFECTS OF SILVER NANOWIRE ON THE ENHANCEMENT OF TiO2 BASED DYE-SENSITIZED SOLAR CELLS Nanoscale metal structures embedded in DSSC devices could also potentially be beneficial in improving the light absorption, as well as the charge separation and charge collection processes. In this research, TiO2 was used as a photoelectrode and eosin y is used as photosensitizers. Using a Mayer rod coating method, a highly viscous titanium dioxide (TiO2) paste was deposited on a FTO glass substrate. Metal nanowire such as silver nanowire (Ag NWs) was coated on the TiO2 active layers to enhance the photon absorption and charge separation efficiency. The structural properties of the Ag NWs coated TiO2 active layer were studied by using XRD and SEM techniques. Photovoltaic parameters such as short circuit current, open circuit voltage, fill factor FF, and efficiency were determined under light intensity of 11 mW/cm2 . 2020
808 Lwin Ko Oo IMPROVING THE ELECTRICAL CONDUCTIVITY OF GRAPHENE LAYER BY CHEMICAL DOPING OF SILVER NITRATE In the present work, graphene oxides (GO) synthesized directly from graphite powder according to Hummers method were chemically reduced using ascorbic acid and ammonia achieving the reduced graphene oxide (rGO). The Ag-rGO nanocomposite was prepared by hydrothermal process using silver nitrate (AgNO3) as a precursor. As synthesized GO, rGO and Ag-rGO nanocomposite were characterized with Fourier transform infrared spectrophotometer (FTIR), Scanning electron microscope (SEM), X-Ray Diffractometry (XRD) and Raman spectroscopy. The SEM micrographs show the ultrathin, wrinkled, layered flakes and paper-like morphology of graphene sheets. Raman and FTIR spectroscopic investigations provided the information about the number of graphene layers and structural properties. The conductivity measurement showed that the electrical conductivity is improved upon silver doping on graphene sheet. 2020
809 Hsan Htoo STRUCTURAL ANALYSIS OF LAYERS OF PEROVSKITE SOLAR CELL BY USING SMARTLAB X-ray DIFFRACTOMETER X-ray structure and crystallite size of fabricated layers of perovskite solar cell were investigated. The first layer, compact TiO2 layer was deposited using a spray pyrolysis method. The structure TiO2 is tetragonal and crystallite size of first TiO2 layer is 43.20 nm. The second mesoporous TiO2 was deposited by screen printing of TiO2 slurry and the crystallite size is 53.10 nm. The third ZrO2 space layer was printed on the top of the TiO2 layer using ZrO2 paste and the crystallite size is 33.26 nm. The structure of ZrO2 is monoclinic. Then, a carbon counter electrode was coated on the top of the ZrO2 layer by printing carbon slurry and the crystallite size is 27.00 nm. The CH3NH3PbI3 perovskite layer was prepared by two-step solution method. The unit cell structure is tetragonal and the crystallite sizes lie between 22.30 nm to 27.40 nm. From XRD results, the lattice constants of CH3NH3PbI3 are 8.86 Å and 12.66 Å. The bond distances among the atoms of perovskite layer are 2.66 Å at Pb1-I1, 3.15 Å at Pb1-I2 and 1.13 Å at C1-N1. 2020
810 Myo Aung ACOUSTIC ABSORPTION PROPERTIES OF FIVE KINDS OF MYANMAR WOOD The acoustic absorption property is commonly used to characterize and rank of the materials to reduce noise. The purpose of this research is to study the sound absorption coefficient of five kinds of Myanmar wood such as Pyinkado (Xylia xylocarpa Taub.), Teak (Tectona grandis), Kanyin (Dipterocarpus), Rubber (Hevea brasiliensis) and Pine (Pinus sp. L.). The experimental investigation of sound absorption coefficient was conducted based on one microphone impedance tube method for the working frequency ranging from 100 Hz to 2600 Hz. The morphology of test wood samples is characterized by optical microscope. The results show that the sound absorption coefficient of five kinds of wood samples depend on the number of vessel as well as vessel diameter and teak wood has better sound absorption coefficient in comparison with others. 2020