Pub Date : 2023-11-10DOI: 10.55766/sujst-2023-05-e02716
P. Panpho, Ketkanok Kaewmud, Narathip Vittayakorn, R. Sumang
In this research studied the use of calcium carbonate (CaCO3) from golden apple snail (GAS) shells for application as an absorbent material to remove heavy metals in water sources, which replaces commercial calcium carbonate (CaCO3) to reduce production costs and increase waste value. The adsorption of heavy metal contents (such as lead; Pb and Cadmium; Cd), phase formation, and physical characterization of golden apple snail shells were investigated for use as a calcium source in the production of naturally based biomaterials. The samples were calcined between 700°C and 950°C for 5 hr. TG and DTA analysis of samples demonstrated the decomposition of CaCO3 to CaO. The XRD results demonstrated that natural shell powder has a crystal phase of CaCO3 with an aragonite structure. Furthermore, the CaCO3 (calcite phase) was transformed into calcium oxide (CaO) as a component, which showed that the phase transformation depended on the calcination temperature. The adsorption experiments showed good performance at about 99.6%, 99.7%, and 97% removal efficiency in a shorter time for calcined GAS at 700, 800, and 900°C, respectively. This study suggests that the golden apple snail shell could be an effective biomaterial for heavy removal from contaminated water.
{"title":"ADSORPTION OF HEAVY METALS USING BIO-CALCIUM CARBONATE DERIVED FROM A GOLDEN APPLE SNAIL (GAS) SHELL","authors":"P. Panpho, Ketkanok Kaewmud, Narathip Vittayakorn, R. Sumang","doi":"10.55766/sujst-2023-05-e02716","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e02716","url":null,"abstract":"In this research studied the use of calcium carbonate (CaCO3) from golden apple snail (GAS) shells for application as an absorbent material to remove heavy metals in water sources, which replaces commercial calcium carbonate (CaCO3) to reduce production costs and increase waste value. The adsorption of heavy metal contents (such as lead; Pb and Cadmium; Cd), phase formation, and physical characterization of golden apple snail shells were investigated for use as a calcium source in the production of naturally based biomaterials. The samples were calcined between 700°C and 950°C for 5 hr. TG and DTA analysis of samples demonstrated the decomposition of CaCO3 to CaO. The XRD results demonstrated that natural shell powder has a crystal phase of CaCO3 with an aragonite structure. Furthermore, the CaCO3 (calcite phase) was transformed into calcium oxide (CaO) as a component, which showed that the phase transformation depended on the calcination temperature. The adsorption experiments showed good performance at about 99.6%, 99.7%, and 97% removal efficiency in a shorter time for calcined GAS at 700, 800, and 900°C, respectively. This study suggests that the golden apple snail shell could be an effective biomaterial for heavy removal from contaminated water.","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139280673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-10DOI: 10.55766/sujst-2023-05-e02586
T. Phaechamud, N. Lertsuphotvanit, Ngamsil Kabthong, Tiraniti Chuenbarn, Phonpisith Richkamroph, Kirkphonkij Richkamroph
Solvent exchange-induced in situ-forming gel (isg) and in situ-forming microparticles (ism) have been currently applied as drug delivery approaches for periodontitis treatment. Doxycycline hyclate-loaded Eudragit RS-based isg and ism were prepared in this study. The basic properties such as density, pH, surface/interfacial tension of their solvents including dimethyl sulfoxide (DMSO), N-methyl pyrrolidone (NMP), and 2-pyrrolidone (PYR) in Eudragit RS solution and oils (olive oil and camellia oil) were assessed. This research also tested for apparent viscosity of solvent and drug-free and doxycycline hyclate-loaded ERS-based isg and ism, and their phase transformation rates. Density of PYR was higher than that of DMSO whereas these solvents exhibited the less wettability than oils on glass slide. All fabricated doxycycline hyclate-loaded Eudragit RS-based ism formulations showed good emulsion physical stability with no phase separation for 1 hour. The apparent viscosity of ism was significantly less than that of isg. DMSO-based isg and ism exhibited a significantly less viscosity than that of PYR-based formulations. Rapid phase inversion was evident after isg and ism exposure to agarose gel indicating fast solvent exchange. The loose barrier of camellia oil from its less viscosity facilitated a water diffusion inward Eudragit RS-based ism easier than using viscous olive oil. Solvent exchange-induced doxycycline hyclate-loaded Eudragit RS-based ism using DMSO as the solvent and camellia oil as the continuous phase exhibited various appropriate physicochemical characteristics for applying as drug delivery system for periodontitis treatment.
目前，溶剂交换诱导的原位形成凝胶（isg）和原位形成微颗粒（ism）已被用作治疗牙周炎的给药方法。本研究制备了基于 Eudragit RS 的原位形成凝胶（isg）和原位形成微粒（ism）。研究评估了 Eudragit RS 溶液和油（橄榄油和山茶油）的基本特性，如密度、pH 值、溶剂（包括二甲基亚砜（DMSO）、N-甲基吡咯烷酮（NMP）和 2-吡咯烷酮（PYR））的表面/界面张力。这项研究还测试了溶剂型、无药型和负载了强力霉素的 ERS 型 isg 和 ism 的表观粘度及其相变率。PYR的密度高于DMSO，而这些溶剂在玻璃载玻片上的润湿性低于油。所有基于 Eudragit RS 的异构体制剂都显示出良好的乳液物理稳定性，在 1 小时内没有发生相分离。ism 的表观粘度明显低于 isg。基于二甲基亚砜的 isg 和 ism 的粘度明显低于基于PYR 的配方。将 isg 和 ism 暴露于琼脂糖凝胶后，相位迅速倒转，表明溶剂交换迅速。由于山茶油的粘度较低，其疏松的阻隔性比使用粘稠的橄榄油更容易促进水向 Eudragit RS 为基础的异构体内部扩散。以二甲基亚砜为溶剂、山茶油为连续相的溶剂交换诱导型多西环素负载型 Eudragit RS 基等离子体表现出各种适当的理化特性，可用作治疗牙周炎的给药系统。
{"title":"FLUID PROPERTIES OF COMPONENTS FOR DEVELOPMENT OF EUDRAGIT RS-BASED IN SITU-FORMING GEL AND MICROPARTICLE AND THEIR PHASE INVERSIONS","authors":"T. Phaechamud, N. Lertsuphotvanit, Ngamsil Kabthong, Tiraniti Chuenbarn, Phonpisith Richkamroph, Kirkphonkij Richkamroph","doi":"10.55766/sujst-2023-05-e02586","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e02586","url":null,"abstract":"Solvent exchange-induced in situ-forming gel (isg) and in situ-forming microparticles (ism) have been currently applied as drug delivery approaches for periodontitis treatment. Doxycycline hyclate-loaded Eudragit RS-based isg and ism were prepared in this study. The basic properties such as density, pH, surface/interfacial tension of their solvents including dimethyl sulfoxide (DMSO), N-methyl pyrrolidone (NMP), and 2-pyrrolidone (PYR) in Eudragit RS solution and oils (olive oil and camellia oil) were assessed. This research also tested for apparent viscosity of solvent and drug-free and doxycycline hyclate-loaded ERS-based isg and ism, and their phase transformation rates. Density of PYR was higher than that of DMSO whereas these solvents exhibited the less wettability than oils on glass slide. All fabricated doxycycline hyclate-loaded Eudragit RS-based ism formulations showed good emulsion physical stability with no phase separation for 1 hour. The apparent viscosity of ism was significantly less than that of isg. DMSO-based isg and ism exhibited a significantly less viscosity than that of PYR-based formulations. Rapid phase inversion was evident after isg and ism exposure to agarose gel indicating fast solvent exchange. The loose barrier of camellia oil from its less viscosity facilitated a water diffusion inward Eudragit RS-based ism easier than using viscous olive oil. Solvent exchange-induced doxycycline hyclate-loaded Eudragit RS-based ism using DMSO as the solvent and camellia oil as the continuous phase exhibited various appropriate physicochemical characteristics for applying as drug delivery system for periodontitis treatment.","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139281133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-10DOI: 10.55766/sujst-2023-05-e0151
Bopit Chainok, B. Wasuri
Automatic control system for pulsed lighting in sterilization of low-heat fermented food packaging. This paper aims to design and prototype an automatic control system for xenon lamps in pulsed lighting, specifically for sterilizing packages of low-heat fermented foods. The system comprises various components, including lamp holders, lenses, ballasts, heat dissipation mechanisms, power supplies, electronic controller boards, power electronic boards, and touch display control boards. The system’s effectiveness is evaluated through the application of a cultured bactericidal test, focusing on Escherichia coli. Variables such as control light source distance, the number of pulses, light intensity, and energy per unit area are considered. Results indicate that the application of pulsed light, with variations in frequency, leads to a reduction in the number of Escherichia coli colonies observed after the optical test
{"title":"LOW-HEAT STERILIZATION SYSTEM ON FRUIT AND VEGETABLE PICKLING LINE PRODUCTION WITH PULSED LIGHTING","authors":"Bopit Chainok, B. Wasuri","doi":"10.55766/sujst-2023-05-e0151","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e0151","url":null,"abstract":"Automatic control system for pulsed lighting in sterilization of low-heat fermented food packaging. This paper aims to design and prototype an automatic control system for xenon lamps in pulsed lighting, specifically for sterilizing packages of low-heat fermented foods. The system comprises various components, including lamp holders, lenses, ballasts, heat dissipation mechanisms, power supplies, electronic controller boards, power electronic boards, and touch display control boards. The system’s effectiveness is evaluated through the application of a cultured bactericidal test, focusing on Escherichia coli. Variables such as control light source distance, the number of pulses, light intensity, and energy per unit area are considered. Results indicate that the application of pulsed light, with variations in frequency, leads to a reduction in the number of Escherichia coli colonies observed after the optical test","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139281243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-18DOI: 10.55766/sujst-2023-04-e02609
A. Maksuwan, Arpapong Changjan, P. Pramuanl
Recently, Iron-based superconductors have shown promising properties of high critical temperature and high upper critical fields, which are prerequisites for applications in highfield magnets. Extensive research has been conducted on a modeling approach that contributes to predicting doped Iron-based superconductor critical temperature from structural and topological parameters. Statistical significance of differences in modeling approaches requires studies that can reliably distinguish between systematic approach effects and errors resulting from modeling approach variation. In this work, we introduce analysis of variance (ANOVA) to assess the statistical significance of differences in modeling approach variation. Comparisons of obtained results with Iron-based modeling approach variation data of support vector machine (SVM) and linear regression with natural logarithm transformation (LRNLT) were presented.
{"title":"THE APPLICATION OF ANALYSIS OF VARIANCE TO DIFFERENT IRON‑BASED SUPERCONDUCTOR CRITICAL TEMPERATURE MODELING","authors":"A. Maksuwan, Arpapong Changjan, P. Pramuanl","doi":"10.55766/sujst-2023-04-e02609","DOIUrl":"https://doi.org/10.55766/sujst-2023-04-e02609","url":null,"abstract":"Recently, Iron-based superconductors have shown promising properties of high critical temperature and high upper critical fields, which are prerequisites for applications in highfield magnets. Extensive research has been conducted on a modeling approach that contributes to predicting doped Iron-based superconductor critical temperature from structural and topological parameters. Statistical significance of differences in modeling approaches requires studies that can reliably distinguish between systematic approach effects and errors resulting from modeling approach variation. In this work, we introduce analysis of variance (ANOVA) to assess the statistical significance of differences in modeling approach variation. Comparisons of obtained results with Iron-based modeling approach variation data of support vector machine (SVM) and linear regression with natural logarithm transformation (LRNLT) were presented.","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139317070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-09DOI: 10.55766/sujst-2023-04-e02237
J. Prathumsit, W. Phae-Ngam, T. Chaikeeree, N. Mungkung, T. Lertvanithphol, M. Horprathum, Ganatee Gitgeatpong
Vanadium nitride (VN) thin films have been deposited on silicon wafer substrates by reactive DC magnetron sputtering with varied nitrogen (N2) flow rates from 5.0 to 8.0 sccm without substrate heating. The crystallinity, morphology, and optical properties of the prepared VN films were investigated by gracing-incidence X-ray diffraction (GIXRD), field emission scanning electron microscope (FE-SEM), and UV-Vis-NIR spectrophotometer, respectively. The GIXRD pattern shows that the crystal structure of the films is consistent with the face-centered cubic VN structure. An increase in N2 led to a decrease in film thickness and sheet resistance. On the contrary, the reflectance percentage tends to increase with the increase of N2 flow rate. [Copyright information to be updated in the production process].
{"title":"INFLUENCE OF N2 FLOW RATE ON THE PROPERTIES OF VANADIUM NITRIDE THIN FILMS DEPOSITED BY REACTIVE DC MAGNETRON SPUTTERING","authors":"J. Prathumsit, W. Phae-Ngam, T. Chaikeeree, N. Mungkung, T. Lertvanithphol, M. Horprathum, Ganatee Gitgeatpong","doi":"10.55766/sujst-2023-04-e02237","DOIUrl":"https://doi.org/10.55766/sujst-2023-04-e02237","url":null,"abstract":"Vanadium nitride (VN) thin films have been deposited on silicon wafer substrates by reactive DC magnetron sputtering with varied nitrogen (N2) flow rates from 5.0 to 8.0 sccm without substrate heating. The crystallinity, morphology, and optical properties of the prepared VN films were investigated by gracing-incidence X-ray diffraction (GIXRD), field emission scanning electron microscope (FE-SEM), and UV-Vis-NIR spectrophotometer, respectively. The GIXRD pattern shows that the crystal structure of the films is consistent with the face-centered cubic VN structure. An increase in N2 led to a decrease in film thickness and sheet resistance. On the contrary, the reflectance percentage tends to increase with the increase of N2 flow rate. [Copyright information to be updated in the production process].","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139321494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-29DOI: 10.55766/sujst-2023-03-e0912
W. Chaiwat, Pimonpan Inthapat, Suwanna Boontanon, Pensiri Prachakittikul, A. Ua, Supachai Jadsadajerm, Nattawut Setkit, Nakorn Worasuwannarak
Two different combined process sequences of biomass pretreatment between pelletization after torrefaction (PAT) and pelletization before torrefaction (PBT) were comparatively investigated to produce torrefied biomass pellets (TBP) from woody biomasses, e.g. Leucaena (LC) and rubberwood (RW), and agricultural residues, e.g. rice straw (RS) and sugarcane leaves (SCL). In this study, each sample was thermally treated at 260-300°C for 5 min during torrefaction process. It was found that both woody biomasses and agricultural residues had mass yield lower than 63wt%, while the bulk density of TBPs were improved higher than 400kg/m3. For equilibrium moisture content (EMC) analysis, TBPs via PBT method had lower EMC than raw pellet after being kept at 30°C for 12 days. For the thermochemical properties, the TBPs had higher FC, %C, and HHVs than raw pellets in all biomasses and increased with torrefaction temperature. When comparing the TBPs between PAT and PBT torrefied pellets, the HHVs of PBT torrefied pellets at 300°C were achieved highest at 27 MJ/kg for SCL sample, leading to lower H/C and O/C ratio closely to that of lignite. In addition, the combustion performance index (Sn) of PAT and PBT torrefied pellets was lower than raw pellets, showing a similar property as coal and lignite. Briefly, this study suggests using PBT pretreatment process to produce high quality solid fuel, particularly for agricultural residues such as SCL for a potential substitute of currently used coal.
{"title":"PRODUCTION OF TORREFIED BIOMASS PELLETS FROM WOODY AND AGRICULTURAL RESIDUES (TIChE2021)","authors":"W. Chaiwat, Pimonpan Inthapat, Suwanna Boontanon, Pensiri Prachakittikul, A. Ua, Supachai Jadsadajerm, Nattawut Setkit, Nakorn Worasuwannarak","doi":"10.55766/sujst-2023-03-e0912","DOIUrl":"https://doi.org/10.55766/sujst-2023-03-e0912","url":null,"abstract":"Two different combined process sequences of biomass pretreatment between pelletization after torrefaction (PAT) and pelletization before torrefaction (PBT) were comparatively investigated to produce torrefied biomass pellets (TBP) from woody biomasses, e.g. Leucaena (LC) and rubberwood (RW), and agricultural residues, e.g. rice straw (RS) and sugarcane leaves (SCL). In this study, each sample was thermally treated at 260-300°C for 5 min during torrefaction process. It was found that both woody biomasses and agricultural residues had mass yield lower than 63wt%, while the bulk density of TBPs were improved higher than 400kg/m3. For equilibrium moisture content (EMC) analysis, TBPs via PBT method had lower EMC than raw pellet after being kept at 30°C for 12 days. For the thermochemical properties, the TBPs had higher FC, %C, and HHVs than raw pellets in all biomasses and increased with torrefaction temperature. When comparing the TBPs between PAT and PBT torrefied pellets, the HHVs of PBT torrefied pellets at 300°C were achieved highest at 27 MJ/kg for SCL sample, leading to lower H/C and O/C ratio closely to that of lignite. In addition, the combustion performance index (Sn) of PAT and PBT torrefied pellets was lower than raw pellets, showing a similar property as coal and lignite. Briefly, this study suggests using PBT pretreatment process to produce high quality solid fuel, particularly for agricultural residues such as SCL for a potential substitute of currently used coal.","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139334419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-29DOI: 10.55766/sujst-2023-03-e01014
Mangesh Joshi
This paper is aimed at the application of Interpretive Structural Modeling (ISM) for prioritizing the factors associated with the performance evaluation of event-based information management system (EBIMS). The study identified thirteen such critical factors deciding the performance of Event-Based Information Systems. Literature review along with experts' opinions were collected to arrive at the final thirteen factors. In this paper, the authors have used Interpretive Structural Modeling (ISM) approach to interpret the interdependency among the selected factors. In addition, MICMAC (cross-impact matrix multiplication applied to classification) analysis is also performed to illustrate the relative driving and dependence power among the selected factors. This paper infers that event processing algorithm, data volume and quality, and hardware and software along with query complexity are the most dominating factors which have the highest driving power and the minimum dependence power as they drive other factors and sit at the top of the interpretive structure model.
{"title":"PRIORITIZING PERFORMANCE EVALUATION FACTORS OF EVENT-BASED INFORMATION SYSTEMS USING INTERPRETIVE STRUCTURAL MODELING","authors":"Mangesh Joshi","doi":"10.55766/sujst-2023-03-e01014","DOIUrl":"https://doi.org/10.55766/sujst-2023-03-e01014","url":null,"abstract":"This paper is aimed at the application of Interpretive Structural Modeling (ISM) for prioritizing the factors associated with the performance evaluation of event-based information management system (EBIMS). The study identified thirteen such critical factors deciding the performance of Event-Based Information Systems. Literature review along with experts' opinions were collected to arrive at the final thirteen factors. In this paper, the authors have used Interpretive Structural Modeling (ISM) approach to interpret the interdependency among the selected factors. In addition, MICMAC (cross-impact matrix multiplication applied to classification) analysis is also performed to illustrate the relative driving and dependence power among the selected factors. This paper infers that event processing algorithm, data volume and quality, and hardware and software along with query complexity are the most dominating factors which have the highest driving power and the minimum dependence power as they drive other factors and sit at the top of the interpretive structure model.","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"257 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139334482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-29DOI: 10.55766/sujst-2023-03-e01072
Namporn Pituchana, C. Chonglakmani, A. Wannakomol
The study areas cover the coastline of Songkhla, Nakhon Si Thammarat, and Surat Thani provinces in the Gulf of Thailand and Satun, Trang, and Krabi provinces in the Andaman Sea. The coastal change study employs the GIS, remote sensing technique, and field investigation. The geomorphological map was created using the supervised classification method in ENVI (The Environment for Visualizing Images) program and field investigation. The geomorphological study results indicate that old tidal flat, intertidal flat, subtidal flat, old and young lagoons, marsh, and old and young sandy beaches characterize the Gulf of Thailand coast. The Andaman Sea coast is represented by rocky coast, intertidal flat, and young sandy beach. The comparison of the coastal change shows that the coastal erosion of the Gulf of Thailand is more severe than the Andaman Sea coast. Most of the Gulf of Thailand coast is now used for aquaculture, whereas shrimp ponds sensitive to erosion have replaced the former mangrove coast. Along the Andaman Sea coast, erosion is protected by the remaining mangrove swamp, and it occurs only in the local area during seasonal storms.
{"title":"COMPARATIVE STUDY OF COASTAL CHANGE ALONG THE ANDAMAN SEA COAST AND THE GULF OF THAILAND COAST","authors":"Namporn Pituchana, C. Chonglakmani, A. Wannakomol","doi":"10.55766/sujst-2023-03-e01072","DOIUrl":"https://doi.org/10.55766/sujst-2023-03-e01072","url":null,"abstract":"The study areas cover the coastline of Songkhla, Nakhon Si Thammarat, and Surat Thani provinces in the Gulf of Thailand and Satun, Trang, and Krabi provinces in the Andaman Sea. The coastal change study employs the GIS, remote sensing technique, and field investigation. The geomorphological map was created using the supervised classification method in ENVI (The Environment for Visualizing Images) program and field investigation. The geomorphological study results indicate that old tidal flat, intertidal flat, subtidal flat, old and young lagoons, marsh, and old and young sandy beaches characterize the Gulf of Thailand coast. The Andaman Sea coast is represented by rocky coast, intertidal flat, and young sandy beach. The comparison of the coastal change shows that the coastal erosion of the Gulf of Thailand is more severe than the Andaman Sea coast. Most of the Gulf of Thailand coast is now used for aquaculture, whereas shrimp ponds sensitive to erosion have replaced the former mangrove coast. Along the Andaman Sea coast, erosion is protected by the remaining mangrove swamp, and it occurs only in the local area during seasonal storms.","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"82 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139334109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-29DOI: 10.55766/sujst-2023-03-e0693
Niemah Osman, Ali Toum, Tagwa Muhammed, Bara Muhammed, Alhassan Alebied
The energy efficiency of data transmission in Device-to-Device (D2D) communication extends battery lives necessary for service continuity. One communication method in D2D is clustering where one User Equipment (UE) relays data between cluster members and the base station (NodeB). This paper evaluates the energy efficiency of three D2D clustering algorithms: Round Robin, where the cluster head selection is rotational among cluster members, Minimum Distance, where the UE closest to the NodeB is selected cluster head, and Minimum Remaining Power where the UE with the highest battery level is the cluster head. A simulation is developed considering various scenarios where UEs are at different distances from the NodeB, and either stationary or moving at certain speeds. Results reveal that the Minimum Distance is the most energy efficient algorithm when UEs are nearby the NodeB and moving. It also outperforms other algorithms as long as UEs are on the move; so that selection of cluster head is rotated among cluster members. Results also show that maximum energy savings due to clustering are up to 47.4% compared to traditional LTE.
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Pub Date : 2023-09-15DOI: 10.55766/sujst-2023-03-e02350
Ghanta Devadasu, Katukuri Saikiran, S. Muthubalaji
The purpose of this paper is to develop a multiport non-isolated DC-DC converter by using an Artificial Neural Network (ANN) based controlling algorithm. In the existing works, various multiport converter and controlling algorithms are developed for improving the power quality and regulating the voltage of hybrid energy storage systems. Still, some of the models are difficult to understand and require an increased component, high power loss, and reduced efficiency. Therefore, the proposed work intends to develop an ANN-based multiport converter, which helps to regulate the voltage according to the desired level properly. Moreover, this converter has many inputs that are connected and operated simultaneously. The hybrid energy sources considered in this work are solar Photovoltaic (PV) cells, wind, and fuel cells. These sources are connected in parallel, and their output is fed to the non-isolated converter as a single input. Since the input sources fluctuate, their output voltage does not maintain a constant value. In order to maintain the constant outputs, an ANN-based controlling algorithm is deployed in this paper, which helps to boost the level of output voltage properly. In addition to that, the Maximum Peak Point Tracking (MPPT) controlling method is utilized to obtain the maximum energy from the input DC source. Then, a rechargeable battery utilizes the backup supply for power generation. During simulation, the whole system is implemented and tested by using the MATLAB/Simulink platform. The obtained results reveal that the ANN-based controlling technique could efficiently reduce the spikes and maintain the constant output at all times.
本文旨在利用基于人工神经网络（ANN）的控制算法，开发一种多端口非隔离式 DC-DC 转换器。在现有著作中，开发了各种多端口转换器和控制算法，用于改善混合储能系统的电能质量和电压调节。然而，其中一些模型难以理解，而且需要增加组件、高功率损耗和降低效率。因此，拟议的工作打算开发一种基于 ANN 的多端口转换器，它有助于根据所需的电平适当调节电压。此外，这种转换器有多个输入端，可同时连接和操作。本研究考虑的混合能源包括太阳能光伏（PV）电池、风能和燃料电池。这些能源并联在一起，其输出作为单一输入馈入非隔离转换器。由于输入源是波动的，因此它们的输出电压不能保持恒定值。为了保持输出恒定，本文采用了一种基于 ANN 的控制算法，该算法有助于适当提高输出电压水平。此外，还采用了最大峰值点跟踪（MPPT）控制方法，从输入直流电源中获取最大能量。然后，可充电电池利用备用电源发电。在仿真过程中，使用 MATLAB/Simulink 平台实现并测试了整个系统。结果表明，基于 ANN 的控制技术可以有效地减少尖峰，并始终保持恒定的输出。
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