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
831 Aye Myat Mon CONTAMINATION ASSESSMENT NEAR PUBLIC DUG WELLS ALONG SHWE-TA-CHAUNG CREEK Public dug wells are commonly used for drinking, bathing, cleaning and cooking purposes. Two water samples from two dug wells, named Yarma and Cow Lake, along Shwe-Ta-Chaung Creek were examined at Public Health Laboratory in two times to determine the contamination of surface associated with waste water. The first time is October 2017 and second time is March 2018. Four water chemical analysis reports for the two wells are chemically unpotable. The results are compared with the World Health Organization (WHO) standard values to identify the existence of contaminants above the acceptable levels. Also four soil samples near each dug well and related creek were determined with Rigaku EDXRF spectrometer in two times to estimate the elemental pollution in the soil. Contamination factor, modified degree of contamination and pollution load index for soil contamination was calculated. The objective of this research is to determine the environmental pollution on the two public dug wells located adjacent to the Shwe-Ta-Chaung Creek in Tanpawaddy Quarter Mandalay, Myanmar. The water supply wells are impacted by contamination associated with waste water. Yarma Dug Well region adjacent to the rubbish filter site is more polluted than Cow Lake Dug Well region. 2020
832 Seint Seint Aye DETERMINATIONOF TYPEOF HYPERNUCLEUSFROMA SINGLE LAMBDA HYPERNUCLEUS EVENT IN NUCLEAR EMULSION OF KEK-E373 EXPERIMENT The main aim of this research paper is to determine the type of hypernucleus from a single lambda hypernucleus event, which is an event accompanied by one single ? hyperfragment and invisible ? hyperon emitted from a ?nuclear captured at rest, was found in nuclear emulsion of KEK- E373 experiment . It is interpreted as ?- - 14N system decaying into and hyperfragment decay into . The type of hypernucleus can be determined as lambda boron 12 hypernucleus . 2020
833 Shwe Sin Oo GRAM-SCHMIDT ORTHOGONALIZATION PROCEDURE AND CONSTRUCTION OF TWO-BODY BOUND STATE WAVE FUNCTIONS Gram-Schmidt procedure for orthogonalizing vectors or functions is well known. But it is not straight forward to orthogonalize a large set of vectors or functions. We show how this can be accomplished by starting with a set of non-orthogonal set of basis functions. Once orthogonalized, they are normalized so that we have an ortho-normal set of functions. In order to test our functions, they are used as the basis set in expanding the wavefunction of a bound state Schrodinger equation with a specific potential. For test potentials, we use the harmonic oscillator potential and linear potential. The eigen energies and wavefunctions obtained are compared with analytical results for harmonic oscillator potential. For the linear potential, we compare with the standard numerical results. We also compare with the results obtained by using some known ortho-normal basis set of functions. 2020
834 Khin Ye Lwin GAMMA RAY COMPUTED TOMOGRAPHY (CT) FOR THE INDUSTRIAL APPLICATION Radioisotope Techniques have been used as diagnostic tools in various industrial sectors to improve production efficiency and to gain information that cannot be obtained in any other way. The gamma ray computed tomography (CT) is a radioisotope technique largely used for troubleshooting and optimization of the industrial process plants. The experimental research to investigate the interior distribution of density of the different density materials and the phase distribution inside the multiphase system have been carried out using GORBIT - the first generation gamma CT system at the Radioisotope Techniques Laboratory in the Division of Atomic Energy. The GORBIT CT system consists of one collimated radioactive source, one collimated detector, a radiation rate-meter, two servo motors and an electronic control system. The associated GORBIT software was used for controlling the hardware's operations and logging data. The objects were located in the middle of the gantry. The data were collected by measuring the radiation emitted from the radiation source moving around the objects. The radiation source was 50mCi of Co-60 gamma source and the detector was a 2? × 2? NaI (TI) gamma scintillation detector. Tomography images were reconstructed from the acquired gamma transmission data by Filter Back Projection (FBP) algorithm using the separate GORBIT software. The experimental results of two dimensional CT images interpreted the cross sectional profiles of the objects and multiphase system and also provided information on the internal structure of the objects including defects and their dimensions. Therefore the gamma computed tomography (CT) has proved a powerful non destructive testing and evaluation tool and has wide range of applications in the petrochemical and chemical process industries: distillation columns, packed beds, risers, fluidized beds and other multiphase processing units. 2020
835 Aung Ye Htun SYNTHESIS AND CHARACTERIZATION OF NICKEL FERRITES PREPARED BY DIFFERENT METHODS FOR HUMIDITY SENSOR APPLICATION Nickel ferrites, NiFe2O4, were prepared by three different preparation methods; solid state reaction (SSR) method, chemical co-precipitation (CCP) method and auto-combustion (AC) method. XRD technique was used to investigate the crystalline phase formation and to examine the lattice parameters of the samples. From XRD patterns, the samples analogous to cubic structure and the lattice parameters were found with small variation. The average crystallite sizes were obtained as 74.11 nm (solid state reaction method), 85.31 nm (chemical co-precipitation method) and 49.04 nm (auto-combustion method). Morphological features and porosities of the samples were examined by SEM. The samples were made into circular shaped pellets and their humidity sensitive electrical properties were investigated in the relative humidity range of 50 RH% - 99 RH% with the step of 1 RH% for humidity sensor application. 2020
836 Ei Ei Minn EXPERIMENTAL CHARACTERIZATION OF INDEX-COUPLED AND GAIN-COUPLED DISTRIBUTED FEEDBACK (DFB) LASERS For WDM or dense WDM communication systems, long FP lasers ( cavity length> 200?m ) are not useful because of their many-modes and strong thermal dependent system. The development of high-power, single mode lasers is needed. In this paper, we investigated the characteristics of the lasing mode spectra of the Index –Coupled and Gain-Coupled DFB lasers before and after AR coating. 2020
837 Win Win Yee STRUCTURAL CHARACTERIZATION AND NON-OHMIC PROPERTIES OF AL DOPED ZNO VARISTORS Al (0 mol%,1 mol% & 2 mol%) doped ZnO ceramics are prepared by using solid state reaction method. Samples are heat treated at 500oC for 3 hrs. After pre-heat treatment schedule, samples are heated treatment again temperature 1100oC for 2 hrs respectively. Structural characterization of the samples are investigation by using XRD. From the XRD analysis, structural properties such as, lattice parameters, crystallite size and micro stain are evaluated. Energy gaps of the samples are studied by using UV Vis spectrometer. Non-Ohmic behavior of the Al doped ZnO ceramics varistors are also determined. 2020
838 Yin Yin Nu AN EXISTENCEOF HYPERONIN HYDROGEN-LIKE ATOM FOR ? - ?b SYSTEM The purpose of our research is to calculate the energy of hydrogen-like ? - ?b atom for various states by solving the Schrödinger equation. We assumed as ? - ?b atom is liked an ordinary hydrogen atom in which the electron is replaced by a negative xi hyperon. By assuming above approximation, we also calculated the energy of hydrogen-like 81- Pb ionized atom.And then, we determined the radius of hydrogen-like ? - ?b atom to know about their structure. We found that the energy of hydrogen-like ? - ?b atom is greater than 81? Pb ionized atom for various orbits and the inclusion of xi reduces the size of the atom in such a way the smaller radius is obtained. In addition, we observed that the radius of ? - ?b atom is less than nuclear radius for lower orbits. It is found that the existence of atomic state and nuclear state cannot be distinguished in lower orbits. In this way, the existence of atomic and nuclear hybrid state can be found in lower orbits of ? - ?b atom. 2020
839 Thazin Khaing ENHANCEMENTOF MRI BRAINIMAGESUSING MATLAB Image enhancement aims to increase the visibility of original input images and to convert them into a better form with detail information. Images enhancement is a vital role in image processing because of the poor contrast depending on the nature of the images. In this research, a total of 100 test grayscale images which are normal and abnormal MRI brain (512×512) pixels images have been processed by using enhancement techniques. This research described the methods of enhancement of magnetic resonance imaging (MRI) brain images in spatial domain by using MATLAB. Image data used in this research were obtained from No (2) military hospital 500 bedded, Dagon Township, Yangon (Myanmar). The best technique to be applied for MRI brain images has been identified by comparing the result of peak signal to noise ratio (PSNR). Based on the result obtained, it has been confirmed that the combination of spatial filtering and histogram equalization technique is more suitable for enhancement of the MRI brain images. 2020
840 Seinn Nwe Aung PREPARATION OF CALCIUM PHOSPHATE BIOMATERIALS BY USING MICROWAVE–ASSISTED CO-PRECIPITATION The calcium phosphate-based biomaterials have been synthesized by microwave assisted coprecipitation method. The calcium nitrate tetrahydrate and diammonium hydrogen phosphate have been used as calcium and phosphorus sources. The pH regulation has been performed by using two types of inorganic bases; sodium hydroxide and ammonium hydroxide during processing. The phase formation of the synthesized biomaterials with two different inorganic bases has been compared in this work. The synthetic samples have been characterized by using X-ray diffractrometry (XRD), Fourier Transform-Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy(SEM). These results show that crystallized monetite phase and biphasic calcium phosphate (20% of Apatite &80% of Beta tricalcium phosphate)have been obtained via sodium hydroxide assisted synthesis. Crystallized hydroxyapatite (HA) phase and biphasic calcium phosphate (23% of Apatite &97% of ?-tricalcium phosphate) have been obtained via ammonium hydroxide assisted synthesis at calcination temperature of 900ºC. 2020