We will demonstrate the polarization calibration for obtaining the absolute polarization angle from the continuum polarization calibrators at 6 GHz. The data including calibrators and maser sources were observed by the Long Baseline Array (LBA) under the project V452E which aims to study the magnetic field structure in high-mass star-forming regions (HMSFRs). In order to obtain the correct...
The production cross sections of $K^{+}$ as a function of the transverse kinetic energy ($m_{T} – m$) on a nuclear equation of state for $K^{+}$ production in heavy ion-collision by using the quantum molecular dynamics model (QMD) is focused for this work. Production of a cross-section of $K^{+}$ from $^{58}$Ni+$^{58}$Ni collision at energy 1.93 A GeV and rapidity range ($y_{cm}$) from -0.69...
In astronomical researches, a large amount of astronomical data provides astronomers access to research material via an astronomical data archive. In Thailand, The Thai National Observatory (TNO) has been fully operational with both photometric and spectroscopic instruments for a decade and is currently developing next-generation spectroscopic instruments. Despite this, TNO's public data...
The study of the bulge of the Milky Way galaxy is still one of the main puzzles for the Galactic studies. Exploring stars in this region is quite challenging due to not only myriad stars which are tightly packed together in the bulge but also the interstellar dust in the galactic plane which restrict the observation. In order to observe the bulge’s stars through the dust, infrared observations...
5-Hydroxymethylfurfuraldehyde (HMF) is one of the furan derivatives that dehydrate from biomass-based reactants and can further oxidize into a bioplastic substitute. Generally, the oxidation reaction can be accomplished under high temperatures accompanied by the catalyst and oxidizing agent. Those traditional methods required expensive costs and enlarged chemical waste on big batch...
In quantum field theories, interactions between particles can be studied by using Feynman diagrams. Calculating Feynman diagrams in strong interaction between particles results in infinity values. This problem can be solved by using a process of renormalization that is the method of removing an infinity. Invariances under scaling form a group called renormalization group. Some renormalization...
Ganymede is one of Galilean moon whose orbit is inside Jupiter's magnetosphere. The interaction between Ganymede's magnetosphere and magnetospheric plasma around the moon. This interaction results in currents carried along the magnetic flux tube to Jupiter’s ionosphere, and a bright spot called Ganymede's footprint (GFP). This work presents the location shifts of GFP in two parts. In the first...
Introduction: An important phenomenon in a pulsing AGB (Asymptotic Giant Branch) star is the variability of its circumstellar envelope. The study of stimulated radiation called SiO maser (Microwave Amplification by Stimulated Emission of Radiation) in the inner edge of the envelope shows fluctuations in polarization during the stellar pulsation period which is caused by the unstable magnetic...
The metallicity of Proxima Centauri is a quantity of this red dwarf star that is particularly unknown due to heavy molecules that grow on the stellar atmosphere and photosphere for stellar temperatures below 5000 K. The stellar evolution code Modules for Experiments in Stellar Astrophysics (MESA) and the Vienna Atomic Line Database (VALD) are used to investigate observational and spectral data...
Thailand Institute of Nuclear Technology (Public Organization), TINT, has established the Thai Research Reactor TRR-1/M1 and continuously developed a neutron imaging (NI) system for better non-destructive inspection. Neutron tomography (NT) is currently conducted with a neutron flux of 1e5 n/cm2s. Due to the strength of the neutron source, image acquisition is made by increasing exposure time...
The detection of gravitational waves (GWs) from LIGO and Virgo interferometers opened a new era for multi-messenger observations especially with the coincident detection between GW events and gamma-ray burst (GRB) detection. The first GW event detected by LIGO on the $14^{th}$ September 2015 (Abbott et al. 2016) was a binary black hole merger (BBH) until August 2017 nine other mergers of...
The Earth, without its atmosphere, would be a rocky planet with no oceans, clouds, or life. In order to discover the presence of extraterrestrial life, the chemical compositions of the exoplanetary atmosphere should be revealed. Until now, there have been thousands of exoplanets discovered, including more than 3,000 transiting exoplanets. Transmission spectroscopy technique, which studies...
Cancer, the second leading cause of death worldwide, causes people death by growing normal cells larger than cells larger than its boundaries and invade adjoining organs of the body. Currently, proton therapy is one of the radiotherapy techniques for cancer treatment, which is more effective in many ways compared to conventional photon therapy. That’s because of unique depth-dose...
In astrochemistry research, which studies the chemical processes under space-like conditions, experiments need to be done under those extreme conditions. This includes ultra-low pressure of about or less than 10$^{-10}$ Torr and extremely low temperature of about 80K. Therefore, it is necessary to build a device capable of responding to such research condition. In this work, we present the...
In this study, we focus on the period variation of the eclipsing binary star BQ Ari. The observation data was obtained from the Thai Robotic Telescope at Spring Brook Observatory (TRT-SBO) from 2019 to 2020 and the Regional Observatory for Public, Chachoengsao (ROP-CCO) in 2021. The data are combined with the data from the Transiting Exoplanet Survey Satellite (TESS) in Sector 42 and 43. In...
The de Rham-Gabadadze-Tolley (dRGT) black string solution is a cylindrically symmetric and static solution of the Einstein field equation with graviton mass. By investigating the thermodynamic properties of the dRGT black string, we found that the structure of graviton mass can provide the Hawking-Page phase transition. Since the dRGT black string entropy is a non-extensive quantity, we...
At present, the study of extrasolar planets is one of the research topics that are of interest to study in astronomy, because such studies can answer questions about the existence of extraterrestrial life and the ability of human habitation on other planets which is one of the important factors of living ability of organisms similar to life on Earth is the presence of H2O on the ground, on the...
