Abstract: This research aimed to modify of diatomite and leonardite for adsorption of hydrogen sulfide (H2S) gas. The effect of chemical loading on surface modification was studied. Natural diatomite and leonardite were obtained through the natural deposits in Lampang Province, Thailand. Diatomite and leonardite were modified using chemical methods with calcination at 450 °C. The chemical composition and phase structure of adsorbents were characterized by X–Ray fluorescence spectroscopy (XRF) and X–ray diffraction (XRD), respectively. The morphology and disperse energy of the elements were investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The functional group was identified by Fourier transform infrared spectroscopy (FT–IR). The efficiency of adsorption of H2S gas was studied. H2S gas in this study was synthesized by the chemical reaction between sodium sulfide (Na2S) and sulfuric acid (H2SO4). The concentration of hydrogen sulfide was measured by an H2S gas detector. The performance of the modified diatomite and leonardite for adsorption of H2S was compared. It was found that modified diatomite has better efficiency than modified leonardite for the adsorption of H2S gas. After modification process, the adsorption efficiency increased while the adsorption time decreased.
Abstract: The objective of this research was to prepare multi–phase bismuth vanadate (BiVO4) powder using the solvothermal method to be used as a photocatalyst. In the preparation step, bismuth nitrate and ammonium vanadate were used as the precursors with a mole ratio of 1:1. The mixed solution was diluted to 0.025 M with acetic acid and heated at 200 °C for 2 h in a Teflon–lined stainless steel autoclave vessel. Multi–phase BiVO4 was obtained without calcination step. Multi–phase BiVO4 was characterized by X–ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT–IR), and energy dispersive spectroscopy (EDS). The efficiency of multi–phase BiVO4 for photocatalytic degradation of the mixed dye of methylene blue (MB) and rhodamine B (RhB) solution under UV light irradiation was studied. The concentration of the mixed dye solution was measured by UV–Vis spectrophotometry (UV–Vis). The effect of concentration of catalyst and pH of solution was studied. The optimum conditions for photocatalytic degradation of mixed dye solution were obtained at 0.8 g/L for concentration of multi–phase BiVO4 and 7.78 for initial pH of the mixed dye solution.
Abstract: Indium sulfide and zinc oxide (In2S3-ZnO) films have successfully synthesized by doctor blading method coupling with low temperature precipitation-reflux rout. The weight ratio of In2S3 was varied from 0-70 wt.%. Physical characterization results obtained from various analytical techniques exhibit the well crystallinity phase of cubic β-In2S3 and wurtzite ZnO structure from XRD patterns. TEM micrograph of 35% In2S3-ZnO sample showed the small ZnO particles are embedded into β-In2S3. The obtained results exhibited the phase well crystallinity of cubic β-In2S3. A strong adsorption spectra shifted toward visible light region and the narrower optical band gap results of In2S3-ZnO composite films suggesting that synthesized samples could be used as the visible-light-driven photocatalyst. The photocatalytic activity of rhodamine B had been investigated over entire composite films under visible light illumination. It can be seen that the entire In2S3-ZnO composite catalyst films revealed degradation of rhodamine B performance obviously higher than pure ZnO and pure In2S3. Moreover, the highest photocatalytic activity was found from 35% wt. In2S3-ZnO film which showed 69.5% degradation within 4 h under visible light irradiation.
Abstract: This study aims to investigate appropriate utilization of mixing grease waste (GW) from a canteen’s grease trap with bamboo residues charcoal (BC) to produce briquette fuel in the various ratio by weight, 1:2, 2:2, 3:2 and 4:2 (GW:BC). The physical and chemical properties of briquette fuel were analyzed to verify its heating value components as specified by the American Society for Testing and Material (ASTM). The results showed that the mixture of all components could produce charcoal briquette fuel. The GW:BC mixing ratios 3:2 and 4:2 have heating values exceeding the minimum requirement under the Thai Community Product Standard (tcps 238/2004). The briquettes mixing ratio of 3:2 was suitable for utilization. The heating value high to 7,938 cal/g on a dry basis.The charcoal briquette mixed with grease waste can be a feasible alternative energy source for incinerating which minimize to reduce waste.
Abstract: The purpose of this study was to absorb the hydrogen sulfide (H2S) produced by biogas system for local community six absorbents, namely activated carbon, shredded rusty iron and iron oxide-based clay with 4 different size distributions that were tested by employing Completely Randomized Design (CRD). The results showed that iron oxide-based clay from a groundwater supply with smallest size (8.73 mm in diameter) was the most effective absorbent in removing the H2S judging by security level of biogas users and security level of the engine of 368 and 406 minutes, respectively. However, the security level of the engine of the smallest iron oxide was not significantly different from that of medium size (12 mm in diameter) in 325 minutes. For the durability of absorbent determined from H2S was less than 500 ppm, the iron oxide with the smallest size was also effective with the best removal (506 minutes) but was not significantly different from those of the medium size (491 minutes) and the mixed size (435 minutes). Therefore, the smallest iron oxide-based clay was selected for the technology transfer to rubber tree farmers and fishermen in the south of Thailand.
Abstract: In this study, Physical properties of rocks from geothermal reservoir were investigated. To describe rock properties of the selected outcrops, density, radioactivity, and heat production were researched. The obtained density of granite rock from Triassic period and limestone rock from Ordovician period were 2,648±112 kg/m3 and 2,637±96 kg/m3, respectively. Radioactivity of 226Ra 232Th and 40K of granite rock were measured as 109.9±17.2 Bq/kg, 134.2±9.5 Bq/kg, and 1,569.3±75.7 Bq/kg, respectively. For limestone rock, it shows 13.8±6.4 Bq/kg, 23.3±7.7 Bq/kg, and 394.1±117.8 Bq/kg, respectively. After grinding the samples, radioactivity values of 226Ra, 232Th, and 40K were measured by gamma spectrometer. It was found that the concentration of 238U, 232Th, and 40K in granite rocks from Triassic period were 8.90 ppm, 33.07 ppm, and 5.06%, and limestone rocks from Ordovician period are 1.11 ppm, 5.73 ppm, and 1.27%, respectively. The physical properties of reservoir rocks giving geological parameter information were necessary to understand geothermal system of the area in this study and to develop renewable energy for the community.
Abstract: This research aim developing shallot chemical mixer through mutually incorporated technology transfer technique. In comparison between innovation and manual labor, it is found that the diffusion of the machine is minimal or barely increases speed and results in safety when mixing. In term of manual labor, the diffusion process causes delay when mixing and most importantly it may lead to health concerns. As for the value of bruising of the shallot, both techniques show slow bruising value and for electricity value, the motor has a 220 V 50 Hz alternate current electricity pressure. Shallots which weigh 25 kilograms consume 0.4 current A, it could be noticed that in 1 day, 5 hours of chemical mixing- in this case shallot, it requires energy in the amount of0.44 KWh. Taking the calculated value of the rate of power used multiply by the unit of operating electricity, which each household will use less than 150 units per month, since unit 0-150 is at 1.8047 Baht, the example of electricity fee paid daily and monthly will be shown. As for the use of shallot mixture at 25 kilograms using 5 hours, the result is 1,500 kilogram of electricity at 3.97 Baht and 45,000 kilogram per month, which calculates to 23.82 Baht of electricity fee. Comparing this to manual labor of 1 day mixing, the result is 2,000 kilogram at 200 Baht expense; the chemical mixer is therefore cheaper and able to give more accurate portion of the input.It is found that the training plan and manual guiding how to use the iron threshing machine, the learners has progressed in their knowledge at the level of 72.05% and satisfaction producers in terms of its characteristic is very high and the overall overview of the operating of the prototype is very high (x=4.33).
Abstract: This article compares the efficiency of vehicle trajectory analysis methods based on data fusion from multiple cameras, monitoring the same area from different views under the condition having detection errors, which causes incorrectly localized and, in some cases, undetected vehicle during the movement. The experiment used the simulation of detection and localization of vehicle moving in straight, curved, zigzag and arbitrary trajectories, with localization errors and multi-level loss of data. By comparing Kalman-filter-based method and Linear-interpolation-based method for analyzing and reconstructing vehicle trajectory, the result shows that the data loss robustness of Kalman-filter-based method is higher than that of Linear-interpolation-based method, with data loss around 97% 97% and 90% for straight, curved and zigzag trajectories respectively. However, for arbitrary trajectory, the Linear-interpolation-based method is better than Kalman-filter-based method in all levels of data loss. In conclusion, Kalman-filter-based method is effective in the case of unchanged or slight transition of direction, while Linear-interpolation-based method is effective in the case of sudden transition of direction.
Abstract: With the development of the concept of Industry 4.0, research relating to robots is being paid more and more attention, among which the humanoid robot is a very important research topic. The humanoid robot is a robot with a bipedal mechanism. Due to the physical mechanism, humanoid robots can maneuver more easily in complex terrains, such as going up and down the stairs. However, humanoid robots often fall from imbalance. Whether or not the robot can stand up on its own after a fall is a key research issue. However, the often used method of hand tuning to allow robots to stand on its own is very inefficient. In order to solve the above problems, this paper proposes an automatic learning system based on Particle Swarm Optimization (PSO). This system allows the robot to learn how to achieve the motion of rebalancing after a fall. To allow the robot to have the capability of object recognition, this paper also applies the Convolutional Neural Network (CNN) to let the robot perform image recognition and successfully distinguish between 10 types of objects. The effectiveness and feasibility of the motion learning algorithm and the CNN based image classification for vision system proposed in this paper has been confirmed in the experimental results.
Abstract: In this research, a fundamental quantum mechanics and statistical mechanic bound-state problem of harmonics oscillator cosine asymmetric was considered by using partition function method. From the study, it found that the internal energy, the entropy and the specific heat capacity of particle vibration bound-state under harmonics oscillator cosine asymmetric potential were increased as the increasing of the parameters of μ, η, and β. While an increasing of parameter α affected to the decreasing of the entropy and the heat capacity. In addition, the increasing values of the entropy and the specific heat capacity value were depended on the decreasing of the parameter α value.