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
911 Thei' Theint Theint Aung DYNAMICS AND SIMULATION OF THE GRAVITATIONAL COLLAPSE OF A NEUTRON STAR TO A BLACK HOLE Using the highly non-linear differential equations, 3 +1 numerical relativity and TolmanOppenheimer-Volkoff equations, together with so called 1-log slicing condition (singularity avoiding gauge) it has been found that no real and coordinate singularity appears when the numerical simulations are carried out. Mass-Radius and Mass-Density visualization are implemented. 2020
912 Htee Mu Wah SPECTRAL FEATURES AND MUSIC SCALE OF MYANMAR BAMBOO XYLOPHONE Myanmar Bamboo Xylophone (Pattalar) is one of the famous Myanmar fixed-pitch musical instruments, which produce a pleasant sound. Pattalars have their own unique sound with unique parameters different from other musical instruments. The purpose of this paper is to analyzed spectral features of the sound of Pattlar with traditional tuning. The parameters of spectral features such as pitch, harmonics are extracted by short time Fourier transform (STFT). The accurate spacing of harmonic contents and spectral envelope are computed by cepstrum analysis. Then, the frequency contents of signal changes over time are visualized by spectrogram method. The tuning of Pattalar is studied by three different Pattalars with the music scale computed in a logarithmic unit called Cents. The resulting measurements are compared with the pervious measurements data reported by Professor J.West, Professor Dr Maung Maung Kha. 2020
913 Thinzar Wut Yee PREPARATION AND CHARACTERIZATION OF MAGNESIUM COPPER MIXED FERRITE AND MAGNESIUM COPPER THIN FILM Magnesium-Copper mixed ferrite Mg0.5Cu0.5Fe2O4 was prepared by usual ceramic method at 1000°C for 8h. Structural and microstructural characteristics of the sample were characterized by using X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). Temperature dependent electrical conductivities were investigated in the temperature range of 299K-573K region. Furthermore, Mg0.5Cu0.5Fe2O4 thin film was deposited on p-Si substrate by using thermal diffusion method at 500°C for 1h.Microstructural characteristics and film thickness were examined by SEM. Current–Voltage (I-V) characteristics of the film were also investigated under the different illumination of visible light source. 2020
914 Hla Htay Win ARDUINO BASED TEMPERATURE INDICATOR BY USING LM 35 TEMPERATURE SENSOR AND AN RGB LED The “Temperature Indicator Circuit” is mainly implemented by using Arduino Uno microcontroller board and LM35. The peripheral components are 16 x 2 LCD, HC05 Bluetooth module, android phone, RGB LED (common cathode type), buzzer, fan with motor and relay module. The output data is sent to LCD, an RGB LEDs and android phone from Bluetooth module. An LM35 temperature sensor is used for sensing environment temperature. Different temperature ranges will produce a different color on an RGB LED. The Arduino Uno microcontroller sends the calculated temperature to 16 x 2 LCD and RGB LED and the user by using appropriate commands of LM35 temperature sensor. The sketch for the microcontroller were written in the Arduino programming language, debugged, complied and burnt into the ATmega328P microcontroller using the Arduino integrated development environment (IDE). 2020
915 Lwun Htet Nay Aung FILTRATION PROCEDURE FOR ENVIRONMENTAL IMPACT ASSESSMENT OF AIR POLLUTANT Air quality issues are becoming of greater concern to the society because of the negative effects to human beings and the environment. This research was studied and purified the quality of pollutant air in northern Yangon District (Shwe Pyi Thar) from the aspect of physics in the area of environmental impact assessment (EIA). For the air purification process, washable or fiber pre-purifier, active carbon filter, and ultra violet lamp were used to constructed air filter. After using the filtration process, the data was analyzed by Scanning Electron Microscope (SEM). After that, the analyzed data were compared with the data of International Association for Impact Assessment’s (IAIA) data. These analyzed data from the filtration process is slightly different with the International Association for Impact Assessment’s (IAIA) data and the air filter can be widely used in industrial and air pollution problem. In this research presented a work effort to reduce CO2 emissions through Carbon capture and storage mechanisms. Adsorption technique is followed to control the Carbon emissions from the burning of fossil fuels in automobiles, industries and using of fire wood. 2020
916 Win Zaw Myo Htet CONSTRUCTION OF MAXIMUM POWER POINT TRACKING WIND-SOLAR HYBRID CHARGE CONTROLLER Both wind and solar circuits are constructed by using an Arduino Uno that uses ATmega328P. ACS712 Hall Current Sensor and the voltage divider circuit are used to measure the input and output current and voltage of wind, solar and battery. PWM signal is provided by Arduino Uno to drive the MOSFETs via IR2110 MOSFET driver IC. High ampere dc relay is used to switch between dump load and wind circuit. The 4-lines LCD is used to display the voltage and the current of solar, wind and battery. The A/D module of an Arduino Uno is used to convert the output voltage and current from voltage divider and ACS712 into digital forms which are used as the reference values in the program. When battery is at maximum capacity, the controller will activate a relay that will send the excess power to a dump load resistor. 2020
917 Nyein Thida AVERAGING SCHEMES FOR INHOMOGENEOUS UNIVERSE AND TIMESCAPE COSMOLOGIES Timescape model is a phenomenological cosmology model without dark energy. By revisiting Einstein’s strong equivalence principle and extending at the general average of the cosmological Einstein’s equation, one can construct averaging schemes and timescape model. Detailed description of that timescape cosmology and expansion laws in general relativity within a covariant fluid approach have been studied. Physical interpretation of the results are carried out and visualizations of interesting results are implemented. 2020
918 Yee Yee Oo STUDY ON STRUCTURAL AND DIELECTRIC PROPERTIES OF Sr DOPED PbTiO3 FERROELECTRIC MATERIALS We used spin coating to fabricate a Sr doped PbTiO3 thin film on n-Si subtract. By means of X-ray diffraction and scanning electron microscopy analyses, it was confirmed that tetragonal structure at an as-synthesized state. The variations of capacitance (C) with frequency at different temperatures were also observed. It was found that the capacitance was frequency dependent at all temperatures but almost independent in the high frequency range beyond 3 kHz. From the variation of dielectric loss (tan?) with frequency it was seen that tan? values increase rapidly with frequency and attains a minimum value. Reverse C-V characteristics exhibited a linear 1/C 2 versus V plot, from which a built-in potential of 0.71 V-0.85 V were deduced. 2020
919 Thida Win FABRICATION AND CHARACTERIZATION OF ZnTiO3 BASED PEROVSKITE SOLAR CELL ON ITO SUBSTRATE Firstly ZnTiO3; Zinc titanate powder was successfully prepared by a solid state reaction method. After that ZnTiO3 perovskite solar cell was fabricated by titanium dioxide (TiO2) layer as the electron transporter layer (ETL) and CuO as the hole transport layer (HTL).Indium doped Tinoxide (ITO) was used as a substrate. In this research, fabrication of ZTO based perovskite solar cell was investigated. From J-V characteristics, efficiency (?) and fill factor were evaluated under illuminated condition. The conversion efficiency 2.12% of ZTO perovskite solar cell was found. By using fabrication and characterization, this structure ZTO based perovskite solar cell was useful in solar cell application. 2020
920 Aye Aye Min NUCLEON SINGLE-PARTICLE ENERGY LEVELS IN 51Fe AND 51Mn MIRROR NUCLEI In this paper, both the neutron and proton single-particle energy levels of A=51 mirror nuclei, 51Fe and 51Mn have been investigated by solving non-relativistic Schrödinger equation within the framework of Numerov method. In this calculation, phenomenological Woods-Saxon potential with spin-orbit interaction has been applied. Coulomb interaction is also taken into account for proton single-particle model approach. We also found that proton single-particle energy levels are higher than the neutron single-particle energy levels due to the effect of Coulomb repulsion. Moreover, there is some energy discrepancy between 51Fe and 51Mn mirror nuclei for proton single-particle model. This is due to the fact that the number of protons and neutrons are interchanged in the mirror nuclei. Moreover, the total root-mean-square radii of these mirror nuclei have also been investigated and the calculated values are found to be 3.57 fm for 51Fe and 3.56 fm for 51Mn respectively. We also observed the peculiar behavior in the relation between the binding energies and root-mean-square radii. Furthermore, the one nucleon and two nucleons separation energies have been investigated. 2020