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
841 San Htar Oo PREPARATION AND CHARACTERIZATION OF COPPER SUBSTITUTED MAGNESIUM-ZINC FERRITES A series of Copper substituted Magnesium-Zinc ferrites, Mg0.5Zn0.5-xCuxFe2O4 (where x = 0.0 – 0.5 with the step of 0.1) were prepared by solid state reaction method. Stoichiometric compositions of MgO, ZnO, CuO and Fe2O3 were used. XRD patterns indicated that the samples were cubic structure and the crystallite sizes were estimated by using the observed XRD spectral lines. Microstructural properties of the samples were investigated by Scanning Electron Microscope (SEM). It was found that the grain sizes of the samples depend on the concentration of Cu. Some pores were found in the observed SEM images. Vibrational characteristics of the samples were investigated by Fourier Transform Infrared (FTIR) spectroscopic method. The collected spectral lines were identified by using molecular vibrational theory and standard data (wavenumbers). The observed wavenumbers showed that the stretching vibrations of tetrahedral site atoms (?1-mode) and octahedral site atoms (?2-mode) that composed of the samples. 2020
842 Thet Mar Win INFLUENCE OF DEPOSITION TIME ON THE PROPERTIES OF CHEMICAL BATH DEPOSITED NICKEL OXIDE THIN FILMS Nickel Oxide (NiO) thin films were synthesized on glass substrates from aqueous solution of nickel chloride hexahydrate (NiCl2.6H2O), potassium persulfate (K2S2O8), ammonia in which ammonia was employed as complexing agents in the presence of hydroxyl solution. NiO thin films were prepared by Chemical Bath Deposition (CBD) method at different deposition time (60, 75 and 90) min. The structural, surface morphological and optical properties of 450 ºC- annealed NiO thin films were investigated. The XRD studies revealed that NiO thin films were polycrystalline nature with cubic structure. Surface morphology, average grain size and thickness of NiO thin films were estimated from different SEM micrographs. The optical absorbance and transmittance spectra of NiO thin films were recorded in the wavelength range 200 nm - 1100 nm. The sharp absorption peaks of all NiO films were observed at below 400 nm. It was found that NiO thin films with high transmittance in visible region. The refractive index, extinction coefficient and optical conductivity were calculated from the optical measurements. The direct optical energy band gap of 450ºC –annealed NiO films was found to be in the range 3.43 eV3.76eV. 2020
843 Seint Seint Aye GEOCHEMICAL CHARACTERISTIC OF HEAVY METAL CONTAMINATION IN SURFACE SEDIMENTS ALONG THE UPPER AYEYARWADDY RIVER BANK OFMYITKYINA, KACHIN STATE Ayeyarwaddy River is the country’s largest river and Myanmar’s most important commercial waterway. Gold mining is taking place in the headwaters of the Ayeyarwaddy, and sewage from the mining sites contaminates the rivers. The main objective of the present study is to assess heavy metal contamination in sediments from Ayeyarwaddy River. Surface sediments (0-60 cm) from 4 stations along river bank near Myitkyina region were sampled for metal concentration. The concentration of metals (mg/kg) was as follows: 0-670 Cr; 1000-7020 Mn; 4.28-15.99 (%) Fe; 0.446-1.445 (%) Ti and 0-920 Ni. The degree of sediment contaminations were computed using an enrichment factor (EF), geo-accumulation index (Igeo) and pollution load index (PLI). In this work, average EF of the heavy metals were between 0 and 5, therefore the river sediments were between no enrichment and moderate enrichment. The average Igeo values of these metals except Cr, Mn and Ni were less than zero (Igeo< 0), that the river sediments were not polluted by these metals. Therefore, the surface sediments are uncontaminated to moderately contaminated with Cr, Mn and Ni.PLI value of sampling point C was 2.79 indicating that Ayeyarwaddy River was polluted with the heavy metals. The PLI values of other sampling points were greater than 1 (PLI > 1) which would indicate deterioration of site quality. The study revealed that on the basis of computed indexes, the river is classified uncontaminated to moderately contaminated. 2020
844 Win Win Mon DETERMINATION OF RADON CONCENTRATION IN THE STALACTITE WATER FROM MAHAR SADAN CAVE, KAW KA THAUNG CAVE AND EAIK SA TA YA CAVE IN KAYIN STATE, MYANMAR The pure of drinking water is very important for health of our human beings. The water form stalactite can be used as drinking water. Radon gas involvement is a part of the fact that caused water pollution. Using RAD 7 nuclear radiation detector, we tried to test the stalactite water to know how much the level of radon gas involves in it. The following three caves from Kayin State have been experiment; Mahar Sadan cave, Kaw Ka Thaung cave and Eaik Sa Ta Ya cave. Review the results of the radon concentration are as follow; Mahar Sadan cave has 10.7 11 pCi/L, Kaw Ka Thaung cave has 24.9 13 pCi/L and Eaik Sa Ta Ya cave has 29.3 18 pCi/L.According to measurement, the extent of radon concentration in the cave cannot cause danger to human life that is why the stalactite water can be used. 2020
845 Hein Nay Zar Wann RADON MEASUREMENTS IN AND AROUND SOME GOLD MINES IN SHWE KYIN The aim of this paper is to carry out the radon concentration. In this research, radon concentration in five soil samples collected from different depths at Kalain Ravine are recorded by RAD 7 radon detector as 415, 8.20, 16.4, 13.1 and10.9Bq/m3 respectively. At5 ft depth, the recommended remedial action has to perform in less than 3 years and underneath this depth, there is no action required. Collected soil samples were also examined with energy dispersive X-ray fluorescent spectrometer. In addition to the standard feature of identification of all elements sodium (Na) to Uranium in a sample, quantitative information is provided. In these samples, it was observed that the main constituents in all samples Si, Al, Fe, K and S. Potassium was detected in all samples which can contribute to K40 activity. The pore space in soil grains might contain water and if the radon atom terminates its recoil in the water, the radon might be transported to water around mining sites (mine dump, mine tailings or ravine). Water samples were collected and analysed in laboratory to record radon concentration also with RAD7 detector. It was found that the radon concentration in water samples from Kanni tailing dam and Kyet Khat Kali spring were 4.84 pCi/L and 2.68 pCi/L respectively. The water samples were analysed with Atomic Absorption Spectrometer (AAS) to be see the concentration of particular hazardous elements (Pb and K). It has been obtained that in water samples from both sites no trace of lead was found. Potassium contents in water samples from KyetKhatKali site is 1.53 mg/L and that from Kannitwin is 0.99 mg/L. 2020
846 Moht Moht Lwin STRACTURAL AND OPTICAL CHARACTERIZATION OF SENSITIZED ZnO POWDER BY CHEMICAL REACTION METHOD Prepared ZnO powder has been successfully synthesized by chemical reaction method. The calcination of ZnO powder has been characterized by number of techniques such as X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Ultraviolet and Visible spectrophotometry (UV-Vis) at room temperature. The structural characteristic was examined using XRD and the surface morphology of ZnO powder was analyzed by Scanning Electron Microscopy (SEM). XRD analysis revealed that the sample crystallite in polycrystalline nature with wurtzite hexagonal structure and average crystallite was 30.50 nm at 500 °C. The microstructural of SEM result was observed that hexagonal shape and granular in nature. The absorption spectrum indicated that the energy band gap of ZnO powder. The optical property of the ZnO powder was determined by UV-Vis absorption spectrophotometry. The energy band gap of sensitized powder was examined to be equal to 3 eV. Taking into account the results obtained, ZnO powder has been reported for photoanode of solar cell applications. 2020
847 Myint Kalyar CHARACTERIZATION OF DIFFERENT BATH MOLARITY DEPENDENT ZINC OXIDE NANOPARTICLES BY HYDROTHERMAL SYNTHESIS Synthesis of Zinc Oxide nanoparticles (ZnO NPs) were made by using the prepared precursor solution of zinc nitrate hexahydrate (Zn (NO3)2 .6H2O) and different molarity of sodium hydroxide (NaOH) (1 M, 1.5 M) with solvent deionized water through the hydrothermal synthesis. The hydrothermal reaction was carried out at the temperature range (100°C – 150°C) for 7h. After the hydrothermal reactor was naturally cooled to room temperature, the obtained product was filtered and annealed at 200°C for 1h. The obtained Zinc Oxide (ZnO) nanoparticles were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and UV-Vis spectroscopy. The hexagonal wurtzite structure of good crystallinity of ZnO NPs was revealed through the XRD patterns and the crystallite sizes were 29.72 nm and 28.60 nm. The two morphologies of spherical and rod-like structures were found in SEM micrograph. The estimated energy band gaps were 3.06 eV and 3.08 eV obtained through the Tauc’ s plot method. 2020
848 Ohn Mar Swe OPTICAL AND ELECTRICAL PROPERTIES OF (Cu, Al, In) DOPED SnO2 THIN FILMS ON GLASS SUBSTRATE The undoped SnO2, Cu, Al and In (5mol%) doped SnO2 thin films were deposited on glass substrates by sol-gel and spin coating technique. The effect of Cu, Al and In doping on the optical and electrical properties of the SnO2 thin films were studied. The optical transmittance of thin films was measured and the optical band gap Eg values of the films were obtained in the range of 3.4 - 4.00 eV using the Tauc relation. The electrical transport properties of undoped, Cu, Al and In doped SnO2 thin films were investigated by mean of current-voltage (I-V) measurement using simple diode model. The important diode parameters such as ideality factor, saturation current, and barrier height are also calculated. 2020
849 Yin Mar Aung SINGLE-PARTICLE ENERGY STATES FOR 208 208 ? 82 Pb and Pb Single-particle energy states in lambda hypernuclei and ordinary nuclei are calculated to study the structures of and nuclei. The phenomenological Woods-Sexon central potential and Woods-Sexon lambda-core nucleus potential including spin orbit interaction are used. Singleparticle energy levels are investigated by solving one-body Schrodinger equation with the Gaussian basis treatment. 2020
850 Khaing Pwint Wai ACCESSING PAIRING CORRELATION FROM AVERAGE PARING GAPS ALONG POTENTIAL ENERGY SURFACES In this work, the paring correlation along the energy surfaces for some light nuclei has been investigated. To this end, constrained Hartree-Fock+BCS method with Skyrme interaction is employed. Variation of average paring gaps along with the Nilsson single- particle levels at each constrained nuclear shapes shows the relation between nuclear shapes, paring correlation and nature of single particle levels. The calculated results indicate that the effect of paring depends on the level density in the vicinity of highest occupied level. 2020