Description
General oral presentation
Chemo-sensory system is an essential part of the living organism ranging from the smallest bacterial cells up to the most complex neural systems as presented in human. In fact, the sense of smell especially in mammalian species (i.e., dogs and human) occurs at the nanoscale. By transduction of the chemical interactions between the odor molecules with the receptor proteins into electrical...
This work discusses a design framework based on โidea-powerโ established by the late MIT professor Seymour Papert. The GoGo Board is used as a case study of an educational robotics toolkit that follows this design principle by focusing on making important ideas in STEM learnable more than specific technical skills such as circuit assembly and low-level programming. A collection of fieldwork...
This paper presents an alternative approach to enhance studentsโ understanding of a simple harmonic motion (SHM) in that baby mobiles were used as a hands-on activity through a game-based STEM lesson. The subject comprised 28 eleventh grade (mattayom five) students of a public high school in Chanthaburi province, Thailand. The activity was conducted in two consecutive parts. The first part...
Formaldehyde detection is an important method to protect harmful effect on human health. This study aimed to develop a colorimetric sensor for detecting formaldehyde based on thiol-functionalized polydiacetylene (PDA) and zinc oxide (ZnO) nanocomposites. PDA/PDA-SH/ZnO liposomes exhibit a color change from blue to red in the presence of formaldehyde in the range of 100 to 1000 ppm. This color...
Urbanization in the Philippines is at a fast pace. As it grows, urban land expansion increases. It results in the conversion of the different land areas in the country. To determine its changes, this study used geographic information system images by using data products of MODIS Terra and Aqua from NASA EOSDIS, it provides satellite images of the Philippinesโ cover and land use. Eighteen (18)...
We investigated the results of pre-instruction mathematics test and introductory physics exams of two groups of first-year engineering students at Suranaree University of Technology. We intend to examine the test results to identify factors that predict exam results in the first-year physics course. The first and the second groups took their physics classes in the first and second trimester...
โHow to teach effectivelyโ has become challenging to many teachers after their classrooms were moved to an online platform. For high-school physics, we found that students struggled to grasp the concept when learning in the online classroom. Circular motion is the topic that is difficult to focus on details. They could not understand the content well while concentrating on the screen. Some of...
As a result of the coronavirus (Covid-19) epidemic, the public has become actively involved in bodily sanitation. The โNew Normalโ lifestyle now focuses on cleanliness and disinfection to prevent the spread of germs. This research designed and programmed a microcontroller for a UVC disinfection system using an Arduino board as an open-source electronics platform operated with a motion sensor...
The impact of the pandemic on the education sector is severe. It paralyzed the operations and administration of teaching and learning in response to fulfilling the need of the students to do an internship while at home. The Rizal Technological University (RTU) Center for Astronomy Research and Development (CARD) was able to redesign its internship program for students. The Physics, Astronomy,...
This research is the WRF model initial application for wind investigation over Uttaradit Rajabhat University at Lamrang Thungkalo campus under some physical limitations. Its objective is to study weather simulation sensitivities specifically of wind characteristics over the campus on each domain sizes and on each season from selected time periods. Major three case studies are hot season case,...
An experimental set for studying harmonic motion patterns was developed in this research. It was designed to be compact and easy to use. It employs sensors in general smartphones to track trajectory patterns of the object moving in both simple and damped harmonic motions. This experimental set can be remotely controlled and collected trajectory data. The data and patterns of trajectory of the...
A recent study has investigated and studied the growing body of research endeavors on human mobility during quarantine periods, employing a variety of methodologies and procedures. There are also numerous approaches to assessing human mobility using light pollution data. This study focuses on analyzing data on light pollution and the COVID-19 cases in the Philippines. The Visible Infrared...
The teaching of uniform circular motion in high school Physics consists of a combination between theoretical background and experimental method. In particular, the experimental study can emphasize the concept of centrifugal force for the object moving in a circular path. The experiment set has been developed to study the relationship between the centrifugal force and the moving period....
Home healthcare medical technologies have been gaining popularity and are more affordable in recent years. Exhaled breath analysis has potential in this field and the development of gas sensor technology has enabled us to build a small affable breath analysis device together with the electronic nose concept. In this work, a handheld breath analyzer was developed for monitoring body fuel...
Throughout the COVID-19 pandemic, SARS-CoV-2 has been mutated several times into new variants. Some of them are classified as variants of concern (VOCs) by the World Health Organization, such as Alpha (B.1.1.7), Beta (B.1.351), Gamma (P.1), Delta (B.1.617.2), and Omicron (B.1.1.529). In this work, we developed an extended SusceptibleโExposed-InfectionโRecovered model with cross-immunity...
With the growing concern of climate change and the reduction of CO$_{2}$ emission, the Advanced Nanomaterials for enhancing Sustainable Energy and Environment in Dong Phayayen - Khaoyai World Hertage (or ANSEE project) was initiated. Prototypes of green energy applications, especially relating to customized batteries, have been installed and tested in the Khao Yai National Park and farms near...
COVID-19 vaccination is an important role to reduce the chance of infection and lower the risk of hospitalization and death. However, the vaccination is far less effective with the recent emergence of the Omicron variant. In addition, vaccine protection after vaccination may wane over time, thus receiving additional booster doses is significant to maintain the protection. In this work, we...
Net radiation can be used for different purposes especially for studying the energy or radiation balance, which can be further analyzed to investigate a global warming. In order to utilize these applications, it is necessary to know the amount of net radiation in that area. This can be done by installing a net radiometer for measuring the net radiation. However, there are few monitoring...
The first SARS-CoV-2 infections were discovered in Wuhan, China, and then the virus became the pandemic known as โCOVID-19โ. In Thailand, the COVID-19 situation is still on going and is extremely serious in the central region of the country. To understand the pandemic in Thailand, we investigated the association of three variables, temperature, relative humidity, and the concentrations of PM...
High-efficiency perovskite solar cell (PSC) normally utilizes metals such as gold or silver as the electrode to achieve the highest power conversion efficiency (PCE) as possible due to their high charge transfer properties. However, there are some disadvantages of the metal electrodes such as high price, high-temperature deposition requirement, and low hydrophobicity. Recent studies show that...
Many airborne infections can easily be transmitted from a patient through coughing, sneezing, or even talking. This encourages awareness of wearing a mask as a protection. This research demonstrates the dispersion characteristics of exhaled airflow through the different ways of protection using background-oriented schlieren (BOS) technique to visualize the air flow around facial area of a...
Convection is one of the heat transfer mechanisms in which heated fluid expands and rises while the cooled fluid shrinks down. The air convection occurs naturally but difficult to be observed when there is a slight difference between temperature of heated object and the ambience. Schlieren imaging technique is mostly used to visualize the motion of the fluid itself. This method, however...
Western North Pacific is the most active TC Basin globally as the season runs whole year round and Sun is the main driver of Earth's Climate, although climate drivers are the ones that affect the typhoon season. As presented in the literature studies, there are few research studies have investigated the relationship between SSN and Tropical Cyclones, but it is done in a specific location or...
Solar ultraviolet radiation has both beneficial and drawback impacts on human health. Excessive exposure to ultraviolet radiation is hazardous for human. For example, it can cause skin cancer, cataracts and suppression of the immune system. On the other hand, solar ultraviolet radiation is a part of the vitamin D photosynthesis in the human skin. It is needed in the process of synthesize...
Drug delivery system (DDS) has been extensively interested in scientific area such as medical science, environment, industry, agriculture and food processing. In this work, nanobubble (NB) was developed as carrier in the DDS and applied in the niosome particle. The DDS had been prepared by jointing of MNB technology, mechanical technique (ball milling) and niosome particle. Drug particle...
A cavity formed from an impact of a ball on a fluid surface will begin to collapse into two volumes: one wrapping around the ball and another rising to the surface. The experiment measuring the volume of the rising cavity suggested that it is the same across different liquid densities. This research presents a mathematical model to explain the phenomenon and its correspondence with the...
The spread factor of liquid-stains on glass surfaces, following both perpendicular and non-perpendicular impact velocity, had been studied with a view to understanding whether surface-specific properties affect the size and shape of the stain. According to the properties of swine blood, there is a ratio of the area of change when the blood strikes the surface to the area of the blood when it...
Newtonโs cooling law provides a linear differential equation governing the rate of heat loss of a heated body using the temperature difference of the body with the environment. However, the prediction of Newtonโs cooling law still did not fit with the data under the laboratory framework. Previous works have modified Newton's cooling law by incorporating fractional derivatives as a basis of...
Nowadays, there is much software used for both education and astronomy research. For photometry, license software and high performance of computerโs operating system are required, which are a fund limitation for some schools in Thailand. Thus, in this article, we develop and present the Demonstration Photometry Scripts for Astrophysics Teaching (DPSAT version 1.0). The program is designed to...
We perform a Monte Carlo simulation to study the propagation of uncertainty in Euler rotational kinematic equation. The rate gyro data from an IMU sensor (mpu6050) are inserted into the Euler rotational kinematic differential equation to calculate the sensor orientation, which is specified by its Euler angles. The uncertainty of sensor orientation is determined by simulating the variation of...
The traditional method of dial gauge calibration is time consuming and a measurement result is depending highly on human errors. To overcome this problem, an automatic measuring system based on machine vision has been proposed. This paper presents an application of machine learning based on Open CV for automatic digital dial gauge calibration. The k-Nearest Neighbors algorithm is applied for...
Raman spectroscopy is a spectroscopic technique that is used to analyze the chemical constituents or structure of molecules and can be applied to solid, liquid, and gas materials. This technique has been widely used in various fields such as analysis of medicine constituents in a pharmaceutical application, narcotic classification, examination of explosive substances for forensic medicine, and...
In this report we present a machine vision algorithm for pointer gauge reading based on coordinates transformation. Since a pointer gauge is a polar representation of a linear scale, it is possible to transform its polar reading to the original linear counterpart. Once the picture of a pointer gauge is captured digitally, we can assign the polar positions to each pixel of the image. Those...
Proton computed tomography (pCT) is a novel radiography technology that is used for treatment planning in proton therapy with better benefit of higher position accuracy than the conventional radiography. This work focused on the design and construction of a synchronizing system, the so-called the pCT trigger controller as a key communication part in the pCT prototype. This controller was...
During the fall of a Mahogany seed, its wing-like structure is used to create rotational motion to propel itself further. The following research is concerned with the moment of inertia of the seed, which is the basis for analysing the rotational dynamics of the body. The formula used for calculating the moment of inertia was derived based on the approximated geometry of the seed. The...
The autocollimator is a non-contact angle measuring instrument using the geometric light reflection principle. The instrument can be used in scientific research and industrial applications with high resolution. In this work, we propose an application of the autocollimator for surface profile measurement. We use an autocollimator to directly measure the tangent profile of a surface. The results...
Assessment of annual effective dose due to inhalation and ingestion of radon from 43 groundwater samples at Kantharawichai District, Maha Sarakham Province by using Radon Gas Monitor ATMOS 12 DPX. The results were as follows: 1. radon concentrations in groundwater were ranged from 1.04 โ 21.87 Bq/L with the mean value of 8.27 Bq/L., 2. The annual effective dose due to inhalation from...
Conventional laser triangulations are designed to measure the depth or height on a dull or rough surface. This can be done by projecting a light perpendicularly to the surface and capturing the spot of the diffuse reflection which is scattered from the surface. However, for a shiny or smooth surface, the specular reflection dominates, and it is difficult to detect diffuse reflection. We may...
Green and clean diets are on focus for consumers with healthy and safety concerns. Good source of safe and clean vegetables and fruits are vital. Vegetables and fruits are often found on market shelves in below standard of good agricultural practices. Pesticides and other chemical residues are found in those fruits and vegetables which may connect to many late complication issues in health....
OctoPrint is a powerful open source 3D printer software what user can control and monitor printing jobs with its own online server that suitable for remote and isolated work. The Raspberry pi 3 B+ is hardware for installing Octopi that including Raspbian operating system and OctoPrint software. An USB webcam was connected for live viewing of printing processes and the ESP32 microcontroller...
The surface water wave can be easily seen in everyday life. Extracting crucial wave characteristics is however challenging since the wave propagation phenomena occurs so rapidly to measure its characters. Free surface synthetic schlieren (FS-SS) offers a great visualization technique of surface water disturbance using invert gradient algorithm of background patterns. In this study, a ring...
An invisible cloak is an appliance that is frequently mentioned in many pieces of non-scientific literature as an attention-grabbing component. It can cause any desired object to disappear while the observer will still see its surroundings, i.e., the object under its effect becomes translucent. A similar effect can be demonstrated in laboratories by using optical instruments such as a...
Modelling is a power tool in a development of an engineering system. In this study, a solar vapour compression refrigeration system was modelled by two machine learning approaches, namely ARX and ANN and the performance of these two approaches were compared. The solar refrigeration system is composed mainly of a vapour compression unit, two 300W-solar modules, two 12V-batteries with the...
The reactive oxygen nitrogen species (RONS) from plasma activation is intensively used in agriculture, particularly in the regulation of seeds germination and plants growth. It shows a promising effect on increasing the germination rate and promoting the growth of plants. This research employs plasma activated water (PAW) in cultivation of green algae (Chlorella spp.). The objective of this...
Hair cells are the sensory receptors of the auditory and vestibular systems. A bundle of cilia situated atop each hair cell, termed the hair-cell bundle, is deflected upon an impinging of a mechanical force. This subsequently modulates the open probability of mechanically gated ion channels. Owing to the asymmetry in the geometry of the hair-cell bundle, individual hair cells are polarized and...
The ant species Oecophylla smaragdina, commonly known as the weaver ant, is native to tropical Asia and Africa. Ants are known for highly-organized, co-operative behavior and weaver ants are particularly adept at working together, in numbers, to accomplish large-scale tasks. Considered an example of a coherent many-body system, weaver ants have been studied by researchers in various fields....
Tomato, mango, banana and durian are climacteric fruits characterized as having high respiration rate during the ripening. Generation of ethylene is actively involved in metabolic activities leading to the ripening. Inhibition of the ethylene generation is therefore able to delay the ripening. Typically, the ethylene generation is dependent on temperature, oxygen level and fruit injury which...
In this article, we investigate the network structure of stocks in the Thai stock market from 2008 to 2020, applying the correlation distance as weights and the average of correlations as a criterion for deciding whether two stocks are connected. We can access and filter strongly correlated and weakly correlated stocks in a financial network using different average correlation thresholds...
In all sports involving a ball, spin is heavily utilized to alter the ball's course. A spinning ball has more kinetic energy of the same ball traveling with the same translational velocity. The additional energy comes from the rotation of the ball. This extra hidden energy can affect the trajectory of the ball as the ball interact with the floor or even with the air. Dimples are placed on...
Global spectral solar irradiance is of importance for various solar energy applications such as photovoltaic systems and selective surfaces of flat plate solar collectors. In this study, a model for estimating global spectral solar irradiance under all-sky conditions for Nakhon Pathom station (13.82หN, 100.04หE) Thailand was developed. The model expresses the global spectral solar irradiance...
Radiative cooling is a passive cooling process that requires no additional input of energy which can be used as a cooling process in various fields. Though many radiative cooling materials have been conducted to improve efficiency in temperature reduction during the past few years, the scalability and the applicability are equally important. With high efficiency and low scalability,...
In the past few years, there were accidents that caused people to die from hydrogen sulfide gas. This is due to the lack of warning system and appropriate measuring equipment. General commercial hydrogen sulfide detectors are not suitable to use in the risk area as users have to take them into the area which could be dangerous if the gas concentration exceeds the limit. Therefore, the purpose...
