Research List

No.	Researcher	Title	Abstract	Year
431	Ohn Mar Swe	MICROSTRUCTURE AND STRUCTURAL PROPERTIES OF (Cu, Al, In) DOPED SnO2 THIN FILMS DEPOSITED BY SPIN COATING METHOD	The effect of Cu,Al and In doping on the microstructural and structural properties of the SnO2 thin films were studied. The undoped, Cu, Al and In (5 mol%) dopedSnO2 thin films were deposited on glass substrates by sol-gel and spin coating technique. The microstructure properties of the samples were investigated by X-ray diffraction (XRD) method. It was determined that the samples formed at polycrystalline structure in tetragonal phase and structure was not changed by doping materials. The surface morphology of the samples were investigated by scanning electron microscopy (SEM). The lattice parameters, unit cell volume, crystallite size and grain size were determined.	2019
432	Shwe Nan Htet	RADON DETERMINATION FOR BASEMENT OF BUILDING BY USING SOLID STATE NUCLEAR TRACK DETECTOR	Determination of radon in basement of building was carried out by using LR 115 Type II solid state nuclear track detector with exposure period of 100 days during rainy season, winter and summer. The detectors were placed about 2.4 m from the floor at the five concrete tiles in the basement of selected building. After exposure, the detectors were etched in a NaOH solution of 2.5 N at temperature of 60�C for 90 min. Optical microscope NIKON ECLIPSE 50i was used to count the number of tracks on the detector. It was observed that track density of samples ranged from 7.80 � 0.49 to 16.51 � 0.91 C/cm2 day-1 in rainy reason, 5.48 � 0.33 to 8.79 � 0.54 C/cm2 day-1 in winter and 6.88 � 0.41 to 14.73 � 0.74 C/cm2 day-1 in summer. Radon concentration values were found to vary from 155 � 9.73 to 329 � 18.14 Bqm-3 with a mean value of 239.4 � 12.35 Bqm-3 in rainy season, 109 � 6.51 to 175 � 10.71 Bqm-3 with a mean value of 139.6 � 8.79 Bqm-3 in winter and 137 � 8.25 to 294 � 14.72 Bqm-3 with a mean value of 181.80 � 10.60 Bqm-3 in summer. The overall radon concentration varied from 109 � 6.51 to 329 � 18.14 Bqm-3 with an average of 186.80 � 10.58 Bqm-3 and the annual effective dose varied from 1.88 � 0.11 to 5.66 � 0.31 mSv/yr with the average value of 3.22 � 0.18 mSv/yr in basement of selected tower for rainy season, winter and summer. The value of radon concentration and the annual effective dose in basement of selected building for rainy season, winter and summer were within the reference levels (200�600 Bqm-3 and 3�10 mSv/y) of International Commission of Radiological Protection (ICRP).	2019
433	Khaing May Win	AUTOMATIC SOLAR TRACKING SYSTEM USING PILOT PANEL	Solar tracker is an automated solar panel that can effectively improve energy efficiency of a solar photovoltaic (PV) panel. The solar panel are intended to follow and track the direction of the highest light intensity from the sun. Development of dual axis solar tracker involves design implementation and software description for the control program. Arduino UNO, DC gear motors and light dependent resistors (LDRs) have been mainly used in the system. The L298N driver has been used to drive DC motors for making the direction and speed decisions of motors. The tracker�s control algorithm has been implemented via A Tmega 328p microcontroller on a simple and cheap mechanical structure. The hardware design has been implemented in order to provide high efficiency from the solar PV panel in this work. The movement of dual axis solar panel has been controlled by using the difference of light intensity values from four sensors. The test result has confirmed that the solar panel is controlled by the program to be normal to the sun all the day time in order to provide the maximum energy efficiency. The system can be applicable to receive the maximum energy efficiency from the solar panel all the year around.	2019
434	Nay Win Tun	THERMAL AND MORPHOLOGICAL ANALYSES OF HAP/?-TCP BIPHASIC BIOMATERIALS	This research has been embarked to prepare hydroxyapatite by co-precipitation method to provide an accurate understanding of the behavior of biphasic biomaterials with HAP and ?-TCP. Raw materials of calcium sulphate dihydrate (CaSO4.2H2O, or Gypsum) and di-ammonium hydrogen phosphate ((NH4)2HPO4) solution have been used as the starting materials to synthesize high purity hydroxyapatite in the first step. The effect of reaction temperature on conversion efficiencies of gypsum to HAP and reaction kinetics has been reported in the previous work. At heat-treatment of 1100?, HAP has converted partially into beta-tricalcium phosphate (?-TCP, Ca3(PO4)2). The phase formations of these samples have been confirmed by using X-ray Diffraction (XRD) technique. Surface morphology and particle size of HAP and HAP/?-TCP samples have been studied by Scanning Electron Microscope (SEM). The effect of the reaction temperature on the morphology of biomaterials has been investigated. The thermal stability studies of the co-precipitated dry powder have been conducted by using Thermo-gravimetric and Differential Thermal analysis (TG/DTA).	2019
435	Ye Wint Tun	CHARACTERIZATION BY XRD ANALYSIS, MOLECULAR VIBRATION AND ELECTRICAL ROPERTIES OF ALUMINIUM DOPED NICKEL-FERRITES PARTICLES	Aluminium doped Nickel-ferrite nanoparticles of general formula: NiAlxFe2?xO4 (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) have been synthesized by sol-gel auto combustion method involving final sintering at 900�C with a heating rate of 5 hours. The phase formations of the sintered samples were characterized by X-ray Diffraction analysis. The X-ray diffraction patterns confirmed formation of ferrite with single phase cubic spinel structure with the appearance of small peaks representing secondary phases. The electrical properties of samples have been measured using Fluke- 189 LCR meter in the low frequency range (1-1000) kHz and higher frequency range (1 kHz to 10GHz).	2019
436	Ye Hlyan Win	PHOTOVOLTAIC PERFORMANCE OF Ag@TiO2 CORE SHELL	Silver particles were synthesized by using an aqueous-based reduction method. Silver thin film (core) was synthesized in form of finely silver films. The ITO coated glass was used as substrate for chemical bath deposition (CBD) at 120?C for 2 h. Shell material (TiO2 solution) was coated onto Ag thin film by spin coating technique. The grain size of the Ag particles, Ag thin film and Ag-TiO2 thin film were studied by scanning electron microscope (SEM). Optical properties of silver thin film were determined from transmittance spectrum with SHIMADZU UV-1800 spectrophotometer. Ag-TiO2 thin film was prepared by spin coating method. The electrical properties were investigated by leakage current versus voltage (I�V) measurements. The reverse bias characteristics and the forward bias characteristics of the Schottky barrier of the Ag-TiO2 thin film were also determined. Photovoltaic parameters: conversion efficiency (?con) 4.83 % and fill factor (FF) 0.27 are also determined.	2019
437	Aye Aye Kay Ky	CHARACTERIZATION OF METHYL AMMONIUM LEAD IODIDE PEROVSKITE FILM BY TWO-STEP DEPOSITION METHOD	Methyl ammonium lead iodide perovskite films were fabricated by using two-step deposition method. PbI2 film was coated by using spin coating method. Making a high quality PbI2 film was easier and better to fabricate a good perovskite film.The spin coating rate, the concentration of the solution and the dipping time was varied to analyze the properties of the perovskite films. The structure of the methyl ammonium lead iodide perovskite films was analyzed by using XRD characterization. The color change of the films at different stages and the mesoporous structure of the film in two-step deposition method were evaluated. The morphology of the perovskite film was characterized by scanning electron microscopy (SEM). The band-gap of the film was analyzed to determine the parameter of the photovoltaic performance of the solar cell by using UV measurement. Finally, the combination of light harvesting layer methyl ammonium lead iodide perovskite film and electron transporting layer TiO2 film was summarized for perovskite solar cell performance.	2019
438	Tin Nyein Nyein Khaing	STRUCTURE AND OPTICAL CHARACTERIZATION OF ORGANIC-INORGANIC METHYL AMMONIUM LEAD BROMIDE FILM FOR SOLAR CELLS	Structure and optical characterization of organic-inorganic methyl ammonium lead bromide film was fabricated by using spin coating and dipping two-step deposition method. The humidity and temperature effect were characterized to improve the morphology of the perovskite film. To verify the thickness of the film and properties, the spin coating rate, dipping solution concentration and annealing temperature were varied. The consistency with mesoporous structure and the color changes of the film at different stages were initialized. The structure of organic- inorganic lead bromide film was analyzed by using XRD characterization. The nano-range grain size and morphology of the perovskite film were characterized by measuring scanning electron microscopy (SEM). The UV measurement was performed to determine the band-gap of the film to justify the parameter of the photovoltaic performance of the solar cell. Finally, the properties of methyl ammonium lead bromide perovskite film and TiO2 film were optimized by varying the thickness of the TiO2 film for high efficiency solar cell performance.	2019
439	Kyaw Hlaing	MICROCONTROLLER BASED GAME TIME CLOCK	Microcontroller based game time clock was constructed for three games. The first one is chess game, the second one is crossword game and the last on is stopwatch (game of go). There are two types in chess game. The first chess game time clock is a �sudden-death� contest with five minutes for each size. The second chess game time clock is a dual counter mode. In dual counter mode, the chess game time intervals can be chosen by the player. In crossword mode, game time clock shows the over time condition by blanking on the appropriate players LED. In the stopwatch mode, the exact time of event especially sports event can be measured. In game time clock the main controlled device is PIC16F887 microcontroller and its software is written in assembly language. The other devices are 7-segment LED, transistor and counter.	2019
440	Khin Myat Thu	FORMATION OF BIPHASIC BIOMATERIALS FROM WHITE CORAL (ANTHOZOA CNIDRIA) AND ITS CHARACTERISTICS	Bioceramics made of hydroxyapatite [Ca10(PO4)6(OH)2: HAP] would be good example of bioactive materials. In the other hand, bones graft made of Beta-Tricalcium Phosphate [Ca3(PO4)2: ?-TCP] appears to be an example of bioresorbable materials. Based on this background, biphasic calcium phosphate comprising of Hydroxyapatite and Beta-Tricalcium Phosphate (HAP- ?-TCP) has been prepared in this work. White Coral (Anthozoa Cnidria) has been used to produce biphasic calcium phosphates by mechano-chemical method. X-Ray Diffraction (XRD) analysis has confirmed the presence of HAP and ?-TCP in major proportions along with Calcium Carbonate (CaCO3) and Calcium Oxide (CaO) in traces revealing the biphasic calcium phosphate nature of synthetic powders. Crystallite size and lattice parameters at different calcination temperatures of 900�C, 1000�C and 1100�C have been calculated and compared. Fourier Transform Infrared (FTIR) spectroscopy has also been confirmed the presence of various chemical ions groups. The surface topography, morphology and agglomerated distribution of the biphasic particles have been characterized by using Scanning Electron Microscopy (SEM). Importantly, the hardness of the biphasic calcium phosphate at different calcination temperatures has been determined for future application as bone replacement.	2019

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