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
421 Myat Thanda Mon A STUDY ON ELEMENTAL AND RADON CONCENTRATION IN RAW MATERIALS OF LIGHTWEIGHT CONCRETE BRICK AND ORDINARY BRICK In the present work, raw materials samples (lime, gypsum, aluminum powder, cement, river sand, terracotta and a mixture of terracotta and black clay) of lightweight concrete brick and ordinary brick were collected from concrete and brick factories in Yangon. The elemental contents and radon concentration of raw materials from lightweight concrete brick and ordinary brick were determined by EDXRF method and passive cup method respectively. Toxic elements such as Hg, Pb, Cd and As concentration in weight percent level were not observed in raw materials of lightweight concrete brick and ordinary brick in EDXRF measurement. From the radon measurement of seven samples, a mixture of terracotta and black clay showed the maximum value of average alpha track_67.82 ± 1.68, alpha track density_93.98 ± 2.54 tracks cm-2day-1 and radon concentration_4699 ± 127.08 Bqm-3 respectively, whereas the value of radon concentration of aluminum powder was comparable with background value. The values of radon concentration from lime, gypsum, aluminum powder and cement for building materials were below ICRP recommended permissible level of 200-600 Bqm-3 but river sand, terracotta and a mixture of terracotta and black clay samples were above permissible level. The annual effective dose of lime, gypsum, aluminum powder, cement and river sand samples were less than recommended level 50m Sv/y. The results showed that cement, gypsum (plaster of paris), lime and aluminum powder could be used as raw material for manufacture of building materials. They were radiological safe as compared to limit ICRP and did not pose any radiological risk 2019
422 Nyein Myat Thu DETERMINATION OF ELEMENTAL CONCENTRATION AND GAMMA ATTENUATION COEFFICIENT OF CONCRETE BLOCK The present work is performed to find out the elemental concentration and gamma attenuation coefficients of Autoclaved Aerated Concrete (AAC) block by using EDXRF method (EDX-720) and gamma spectroscopy method using NaI(Tl) detector for Cs-137 gamma source. The various thicknesses of AAC block samples are used as attenuator for gamma ray intensity in this work. Toxic elements and radioactive nuclides are not detected by EDXRF method. It is highly attenuated to radiation shielding. So, these results will be helpful in the development of radiation shielding technology. 2019
423 May Thu Aung SILVER MODIFIED TITANIUM DIOXIDE THIN FILMS FOR EFFICIENT PHOTODEGRADATION OF METHYL ORANGE Silver-modified titanium dioxide thin films have been prepared via a two-step dipping method. Optimization of the photocatalyst’s performance as a function of dipping time, irradiation time and concentration of dipping solution was performed. The optimum concentration of silver nitrate was found to be 0.001 M. UV-irradiation process of the films were examined for their catalytic activity towards photodegradation of methyl orange (MO). The modified materials presented enhanced photocatalytic efficiency and managed to decompose the organic pollutant. Its pollutant rate was faster than that of undoped original films (TiO2). The increase in Ag+ ion concentration in the dipping solution resulted a decrease in the film’s photocatalytic efficiency due to a shading of available semiconductor surface by the silver layer. Moreover, the lower the average particle size, the higher is the photodegradation percentage. UV analysis indicate the decomposition of M.O. 2019
424 Toe Toe Wai STRUCTURAL STUDIES OF SB DOPED SNO2 THIN FILMS DEVICES A series of Sb-doped samples, SnO2 with doping levels 2mo 4 mol%, 4 mol%, 6 mol%, 8 mol% have been prepared by sol-gel and spiin coating methods. The structural properties of samples were characterized by X-ray Diffraction (XRD) analysis. The microstructural and morphology properties were examined by Scanning Electro microscopy (SEM).The optical properties of the samples were investigated by UV-Vis spectroscopy. According to UV-Vis spectroscopy, the band gap of SnO2 :Sb varied from 3.2 eV to 3.7 eV with variation of Sb dopant concentration .According to the result, it was observed that the structural studies of Sb doped thin films devices were successfully fabricated. 2019
425 Moe Min Min Aye STUDY ON STRUCTURAL, MICROSTRUCTURAL, OPTICAL AND ELECTRICAL PROPERTIES OF LITHIUM COBALT OXIDE AND LITHIUM NICKEL OXIDE FOR THE APPLICATIONS OF SOLID OXIDE FUEL CELLS Solid Oxide Fuel Cell (SOFC) is an electrochemical device that converts the energy of a chemical reaction directly into electrical energy. SOFC materials of Lithium Cobalt Oxide (LiCoO2) and Lithium Nickel Oxide (LiNiO2) were prepared by solid-state reaction method. Structural, microstructural, optical and electrical properties were studied by XRD, SEM, UV-VIS-NIR and electrical conductivity measurement. XRD patterns reveal that the samples analogous to hexagonal structure. The crystallite sizes of the samples were also estimated by using the most intense peaks and obtained as 77.14 nm for LiCoO2and 21.40 nm for LiNiO2 respectively. SEM micrographs indicated that the grain shape of the samples was block shape with clear grain boundary. The energy band gaps Eg were estimated by using the (?h?)2 vs. h? graphs and obtained as 2.69 eV for LiCoO2 and 0.52 eV for LiNiO2. The samples exhibited as the superionic conductors and their activation energies were obtained as 0.4363 eV for LiCoO2 and 0.4370 eV for LiNiO2. 2019
426 July Oo STRUCTURAL ANALYSIS, MICROSTRUCTURAL INVESTIGATION AND ENERGY BAND GAP DETERMINATION OF ZINC OXIDE AND MAGNESIUM TITANATE MIXED COMPOSITE Mixed composite materials of Zinc Oxide and Magnesium Titanate (ZnO:MgTiO3) with the compositions of (20%:80%, 40%:60%, 60%:40% and 80%:20%) were prepared by using solid state reaction method. The samples were characterized by powder X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Ultra-Violet-Visible-Near Infrared (UV-VIS-NIR) spectroscopy to analyze the structural, microstructural and optical properties of the samples. The crystalline phase formation and the structural properties were analyzed from the observed XRD patterns. Microstructural properties of grain shape and sizes were investigated by SEM. The energy band gaps Eg were determined from the Tauc plot of (?h?)2 vs. h? graphs. It was found that the energy band gap decreased with increase in ZnO composition. 2019
427 Amy Aung STRUCTURAL, MICROSTRUCTURAL AND OPTICAL CHARACTERIZATION OF DEPOSITED CUPROUS OXIDE (Cu2O) THIN FILM Cuprous Oxide (Cu2O) thin film has been grown onto indium tin oxide (ITO) coated glass substrate by spin coating technique using different additives, namely, polyethylene glycol and ethylene glycol. It was found that the organic additives added had a significant influence on the formation of Cu2O films and lead to different microstructures and optical properties. The films were characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Ultraviolet-Visible Spectroscopy (UV-Vis). The Cu2O thin films were used as electron collection layer in the application of solar cells. 2019
428 Hnin Yu Wai STRUCTURAL AND VIBRATIONAL INVESTIGATION OF K+(1 MOL%) DOPED LiNH4SO4 SINGLE CRYSTAL Crystals of K+ (1mol%) doped Lithium Ammonium Sulphate, LiNH4SO4, were grown by slow evaporation method of room temperature. Starting materials of Lithium Sulphate, Li2SO4 and Ammonium Sulphate, (NH4)2SO4 with the addition of (1mol%). Potassium Sulphate K2SO4 were used to grow and synthesis the crystals. Structural investigation of the crystal will be reported by XRD method. Lattice parameters of the crystal were also examined. FTIR transmission spectrum of the crystal will be collected by pc controlled FTIR-8400 /SHIMADZU spectrometer between the wavenumber range of 400 cm-1 and 4000 cm-1 region. 2019
429 Khin Moe War CHARACTERIZATION OF MUD OF MUD VOLCANO IN MINBU (NAGA BWET TAUNG) AS GEOPOLYMER RAW MATERIAL The mud of mud volcano sample was collected from an eruption site named "Naga Bwet Taung", Minbu, Magway Region for characterization.X-ray fluorescence (XRF) was used to measure the chemical composition of mud of mud volcano and fly ash. Structure properties of mud and fly ash were examined by X-ray diffraction(XRD).XRD Analysis showed that the major constituents of mud are SiO2 which are higher than those in fly ash. Scanning Electron Microscopy (SEM) was used to observe the microstructure and shape of the mud to compare fly ash. Fourier Transform Infrared Spectroscopy (FTIR) was performed to determine the bonding between the particles in mud and fly ash. The crystalline sizes were also calculated. In brief, the contents in mud of mud volcano is similar to that of fly ash which is commercial product and it was shown that the mud of mud volcano has potential as a raw material in geopolymer system due to characteristic of mud which is comparable to the fly ash. 2019
430 May Kalar Kyaing SYNTHESIS AND CHARACTERIZATION OF STRONTIUM STANNATE TITANATE THIN FILMS Strontium stannate titanate, Sr(SnxTi1-x)O3 thin films on silicon substrates were successfully prepared by spin coating technique. The crystallographic properties of the films were analyzed by X-ray diffractometer and a cubic perovskite structure was found in all samples. The surface morphologies of the films were investigated using scanning electron microscope (SEM) and it was observed that fine grains with different sizes distributed the whole surface of the films. The dielectric constants as a function of applied electric field were calculated from capacitance-voltage measurements at the frequency range of 1 kHz to 100 kHz using LCR meter and the transition behavior was studied depend upon tin content. 2019