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
851 Thet Thet Naing FABRICATION OF MEH-PPV:PCBM BASED ORGANIC SOLAR CELLS For the fabrication of MEH-PPV:PCBM solar cells, the bulk heterojunction blend solutions of MEH-PPV:PCBM (1:2 wt%) were prepared in chloroform, dichlorobenzene, toluene and xylene. A thin layer of poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate) or (PEDOT:PSS) was spin-coated on pre-cleaned ITO glass plates. Then the PEDOT: PSS coated substrate was annealed at 100ºC for 15 min. Subsequently, MEH-PPV:PCBM photoactive layer was spun-coat at 1000 rpm for 60 s on the top of PEDOT:PSS layer. After annealing at 130°C for 8 min, the devices were completed by deposition of cathode aluminum through a mask by thermal evaporation at a pressure of 10-6 Torr. The I-V curves of the devices were recorded under illumination of light intensity (100 mWcm-2 ). The photovoltaic efficiency of organic solar cells were evaluated from the J-V characteristics of the device. It was measured using a computer-controlled digital source meter (Keithley 2420) with a Newport solar simulator (A.M. 1.5, 100 mWcm-2 ). Light intensity was calibrated with a National Renewable Laboratory (NREL)-calibrated monocrystalline Silicon solar cell. 2020
852 Yin Yin Kyi COMPARATIVE STUDY OF CONTACT ANGLE MEASUREMENTS ON POLYMERMDMO-PPV COMPOSITE NIO AND AG/NIOFILMS The wettability behavior of MDMO-PPV solution on NiO and Ag/NiO substrates was investigated by contact angle measurement. The present study focuses on the effect of polymer solution concentration (6-10-14 mg/ml) and solvent (dichlorobenzene) on the wettability of substrate surface. The measured contact angles are 12°, 11° and 10°on NiO films and 22°, 17°, 12° on Ag/NiO films, 14°, 11°, 10° on Ag/NiO films, 19°, 16°, 14° on Ag/NiO films at different silver concentrations (2.5, 5, 10 mM) for polymer concentration of 6, 10 and 14 mg/ml. There is no significant changes in contact angle measurements of MDMO-PPV on NiO and Ag/NiO films. 2020
853 Aye Myat Wai CALCULATION OF HEAVY-ION FUSION CROSS SECTIONS USING DIFFERENT NUCLEAR POTENTIALS The fusion cross sections and fusion barrier distributions of 16O + 148,154Sm systems have been calculated using different types of nuclear potentials. Simple one-dimensional potential model and coupled-channels method have been applied. The calculated results are compared with the experimental data. The calculated fusion cross sections using one-dimensional potential model disagree with the experimental data. The improvements have been made by inclusion of channel coupling effects. The calculated fusion cross sections are also analyzed by calculating the fusion barrier distributions which is sensitive to details structure of the colliding nuclei. 2020
854 Yin Min Kyaw NEUTRON SINGLE PARTICLE ENERGY STATES IN 118Sn BY APPLYING WOODS-SAXON POTENTIAL WITH SPIN ORBIT INTERACTION The purpose of this research work is to analyze the neutron single particle energy levels of 118Sn in non-relativistic shell model. The single particle energy levels and wave function of 118Sn nucleus are obtained by solving one body Schroedinger equation numerically with Numerov Method. Numerov method is one of the methods which can give the energy and wave function simultaneously. In our calculation, the Woods-Saxon potential with spin orbit term is used for interaction between core and single nucleon. . In our calculation of 118Sn, the calculated shell structure of neutron single particle are 1s1/2 , 1p3/2, 1p1/2, 1d5/2, 1d3/2, 2s1/2, 1f7/2, 1f5/2, 2p3/2, 2p1/2, 1g9/2, 1g7/2, 2d5/2, 2d3/2, 3s1/2, and 1h11/2 . 2020
855 Thet Thet Cho NATURAL RADIONUCLIDES IN AGRICULTURAL SOIL IN MANDALAY AREA Natural radionuclides are present in every human environment such as earth crust, water, air, foods and even our own body contains naturally occurring radioactive materials. In this study, the radioactivity levels of 226Ra,232Thand 40K in the agriculturalsoil samples in Mandalay area were determined by using HPGe detector at Department of Physics, University of Mandalay. The activity concentration were found in the range of 8.329 Bq/kg to 33.42 Bq/kg for 226Ra, 16.25Bq/kg to 72.38Bq/ kg for 232Th and 363.4 Bq/kg to 488.3 Bq/kg for 40K, respectively. The radiological hazard parameters for 226Ra, 232Th and 40K in were also evaluated. The radium equivalents activity (Raeq) and the absorbed dose rate (D) are 107.9Bq/kg and 50.72nGy/h. Obtained results were compared and discussed with internationally recommend values. 2020
856 Win Win Maw INVESTIGATION ON MISSING MASS SPECTRUM OF D (K- , n) ^ (1405) REACTION The aim of this research work is to investigate the missing mass spectrum of D (K- , n) ? (1405) reaction process of J-PARC (Japan Proton Accelerator Research Complex) E31 experiment. This experiment which was conducted at J-PARC with 1.0 GeV/c incident momentum of Kon target deuterium. This reaction is expected to enhance a virtual KN scattering process, where a Kbeam kicks a neutron out of the deuteron target in a forward angle and is slowing down to form a ?(1405) with a residual nucleon. We have calculated the missing mass spectrum of D (K- , n) Y reaction with Green's function method by using YA (Yamazaki and Akaishi) potential for KN interaction. It is observed that the missing mass spectrum of the D (K- , n) Y reaction at a neutron forward angle has two peaks, one below the Kp threshold and another above the threshold. The former peak represents ? (1405) quasi-bound state while the latter is a quasi-free Kp peak. 2020
857 Aye Aye Thandar Naing INFLUENCE OF Al DOPING ON THE MICROSTRUCTURAL AND OPTICAL PROPERTIES OF CdSe THIN FILMS Al doped CdSe films were deposited on glass substrate using rolling method. Difference concentrations of Al (10 mol%, 20 mol% & 30 mol%) were introduced into the CdSe matrix. The deposited thin films were annealed at 300?C for 1 hour. The microstructural properties such as lattice parameters, microstrain and dislocation density of the thin films were characterized by X-ray diffraction. Grain size and crystallite variation were studied for Al doping effect. The UVVis spectrometer used to determine optical band gap of thin films. 2020
858 Tin Tin Nyo INTERNET OF THINGS (IOT ) BASED HEART BEAT MONITORING SYSTEM The system implemented in this research is an advanced solution for monitoring the heart beat of a patient at a particular place and makes the information visible anywhere in the world. The technology behind this is Internet of Things (IoT), which is an advanced and efficient solution for connecting the things to the internet and to connect the entire world of things in a network. Here things might be whatever like electronic gadgets, sensors and automotive electronic equipment. The system deals with monitoring heart beat with sensor and send the information to the web page of” thingspeak” server and then plot the sensor data as graphical statistics. “ThingSpeak” has integrated support from the numerical computing software MATLAB from MathWorks. The data updated from the implemented system can be accessible in the internet from anywhere in the world. 2020
859 Zin Zin Naing DATA ACQUISITION OF SOLAR RADIATION AND ULTRA-VIOLET (UV) INTENSITY The intensity of solar radiation and UV radiation are measured using BH1750 by BH1750 sensor and light sensor and ML 8511 UV sensor respectively. The process is implemented by using microcontroller. As BH 1750 light sensor is inter- integrated circuit (I2C) device, it is connected to microcontroller with I2C mode. The data from each sensor are sent to Arduino microcontroller and then, data are displayed on LCD. Simultaneously, the intensity of light and UV radiation are logged in excel spreadsheet directly using the parallex data acquisition (PLX-DAQ) software. These data are uploaded directly to Microsoft(MS) excel spreadsheet directly with the accompanying the current date and time. 2020
860 Zin Mar Win INVESTIGATION OF ENERGY BAND GAP OF Sb DOPED SnO2 THIN FILMS Undoped SnO2 and different Sb concentration (2 mol%, 4 mol%, 6 mol% & 8 mol%) were doped with SnO2 thin films by sol-gel process. Undoped SnO2 and Sb doped SnO2 thin films were grown in glass substrate by using spin coating technique and annealed at 500?C for 1hour. The structural, and optical properties of deposited and doped samples were studied. XRD analysis was carried out to determine the lattice parameters, unit cell volume and crystallite size of the samples. According to the X-ray diffraction spectra the samples were formed with tetragonal structure and preferred orientation alone (110) plane. The dislocation density of the samples are also calculated. From the UV-Visible spectrum, absorption coefficient and the band gap energy of the samples are evaluated. 2020