Pub Date : 2023-12-14DOI: 10.55766/sujst-2023-05-e02873
Surasak Ruamruk, B. Chayasombat, K. Singsoog, A. Vora–ud, W. Namhongsa, P. Pilasuta, T. Seetawan
The power factor is an indicator of the performance of thermoelectric materials. Many researchers improved the thermoelectric conversion efficiency of materials by various techniques such as doping, substitution, and decreasing particle size for dense samples. We present Bi2Te3 and Sb2Te3 materials prepared by hot pressing method at 673 K for 2 h in Ar atmosphere. Bulk samples were investigated for their crystalline structure, hardness, and power factor by XRD, micro-Vickers hardness, and ZEM-3, respectively. The Seebeck coefficient, electrical resistivity, and power factor of n- Bi2Te3 and p- Bi2Te3 bulk samples were higher than literature data in the same temperature range of 325 to 475 K. The higher power factor value of Bi2Te3 and Bi2Te3 bulk samples of this study have resulted from the high density and high micro-Vickers hardness of the samples.
{"title":"POWER FACTOR OF Bi2Te3 AND Sb2Te3 ENHANCED BY HIGH DENSITY AND HARDNESS","authors":"Surasak Ruamruk, B. Chayasombat, K. Singsoog, A. Vora–ud, W. Namhongsa, P. Pilasuta, T. Seetawan","doi":"10.55766/sujst-2023-05-e02873","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e02873","url":null,"abstract":"The power factor is an indicator of the performance of thermoelectric materials. Many researchers improved the thermoelectric conversion efficiency of materials by various techniques such as doping, substitution, and decreasing particle size for dense samples. We present Bi2Te3 and Sb2Te3 materials prepared by hot pressing method at 673 K for 2 h in Ar atmosphere. Bulk samples were investigated for their crystalline structure, hardness, and power factor by XRD, micro-Vickers hardness, and ZEM-3, respectively. The Seebeck coefficient, electrical resistivity, and power factor of n- Bi2Te3 and p- Bi2Te3 bulk samples were higher than literature data in the same temperature range of 325 to 475 K. The higher power factor value of Bi2Te3 and Bi2Te3 bulk samples of this study have resulted from the high density and high micro-Vickers hardness of the samples.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"67 E-3 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138973270","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 : 2023-12-14DOI: 10.55766/sujst-2023-03-e03037
Mohammed Abdul Basheer, A. Rajasri, Syed Tahseen Hussain, Nandiraju Venkata Prasad
Ecological-friendly and unhazardous materials are being prepared by the scientific community in search of novel lead-free ferroelectric materials. K0.5Na0.5NbO3belonging to the ABO3 perovskite was found to be promising ferroelectric lead-free material. A new set of compound, namely, double dopant LKNZN compound was prepared by solid state route. Here, Lithium is partially replaced with Sodium, at A-site, and Zirconium substituted with Niobium, at B-site. The compositional formula of the present investigations is: [((K0.5Na0.5)(1-x)Lix) (Zr0.025Nb0.98)O3], where x=0, and 0.025 9 (labelled as KNN1 and KNN2). In addition we have prepared (K0.5(Na0.475Li0.025)) (Zr0.025Nb0.98)O3 (labelled as KNN3). XRD patterns obtained at room temperaturehave shown maximum intensity peak of (111), confirms the formation of a single-phase. SEM pictures of KNN1 and KNN2 have shown cubical grain with bimodal grain distribution, whereas KNN3 consist of circular bimodal grain distribution. Delectric measurements were studied on the said above samples. It is observed a hump around 200°Cand dielectric transition at 4520°C for all the samples. From this it is evident that: (i) the samples are transforming from orthorhombic phase to tetragonal phase near 200°C (ii) around 420°C, samples transform from tetragonal phase to cubic phase. Theresults were corroborated to the tolerance factor and lattice distortions.
{"title":"ELECTRICAL PROPERTIES OF MULTI-VALENT ALTERNATE ABO3 PEROVSKITE (KNN) MULTI-FUNCTIONALFERROELECTRIC CERAMICS","authors":"Mohammed Abdul Basheer, A. Rajasri, Syed Tahseen Hussain, Nandiraju Venkata Prasad","doi":"10.55766/sujst-2023-03-e03037","DOIUrl":"https://doi.org/10.55766/sujst-2023-03-e03037","url":null,"abstract":"Ecological-friendly and unhazardous materials are being prepared by the scientific community in search of novel lead-free ferroelectric materials. K0.5Na0.5NbO3belonging to the ABO3 perovskite was found to be promising ferroelectric lead-free material. A new set of compound, namely, double dopant LKNZN compound was prepared by solid state route. Here, Lithium is partially replaced with Sodium, at A-site, and Zirconium substituted with Niobium, at B-site. The compositional formula of the present investigations is: [((K0.5Na0.5)(1-x)Lix) (Zr0.025Nb0.98)O3], where x=0, and 0.025 9 (labelled as KNN1 and KNN2). In addition we have prepared (K0.5(Na0.475Li0.025)) (Zr0.025Nb0.98)O3 (labelled as KNN3). XRD patterns obtained at room temperaturehave shown maximum intensity peak of (111), confirms the formation of a single-phase. SEM pictures of KNN1 and KNN2 have shown cubical grain with bimodal grain distribution, whereas KNN3 consist of circular bimodal grain distribution. Delectric measurements were studied on the said above samples. It is observed a hump around 200°Cand dielectric transition at 4520°C for all the samples. From this it is evident that: (i) the samples are transforming from orthorhombic phase to tetragonal phase near 200°C (ii) around 420°C, samples transform from tetragonal phase to cubic phase. Theresults were corroborated to the tolerance factor and lattice distortions.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"13 12","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138975005","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 : 2023-12-14DOI: 10.55766/sujst-2023-05-e02854
Paramapat Treetornkeerati, Montree Hankoy, M. Kitiwan, Mana Rodchom, S. Vichaphund, D. Atong, P. Tunthawiroon
Aluminum titanate (Al2TiO5) is a promising material for high-temperature applications due to its low thermal expansion, high melting point, and excellent corrosion resistance. In this study, the effect of h-BN addition on the properties of Al2TiO5 composites was investigated. The composites were prepared by sintering a mixture of Al2O3 and TiO2 at a 1:1 molar ratio, with varying amounts of h-BN (5-20 mol%) added to the mixture. The samples were sintered at 1,500ºC for 4 h in an N2 atmosphere, and the bulk density, porosity, phase transition, microstructure, flexural strength, and hardness of the composites were investigated. XRD analysis confirmed the presence of Al2TiO5, Al2O3, and Al18B4O33 phases in the composites. The addition of h-BN in increasing amounts from 5 to 20 mol% resulted in a gradual improvement in the bulk density, flexural strength, and hardness of the Al2TiO5 composites. The composite with the highest h-BN content (20 mol%) exhibited a bulk density of 3.12 g/cm3, as well as the highest flexural strength and hardness values of 123.6±8.9 MPa and 11.2±4.1 GPa, respectively.
{"title":"EFFECT OF h-BN AS AN ADDITIVE ON PHYSICAL AND MECHANICAL PROPERTIES OF Al2TiO5 COMPOSITE","authors":"Paramapat Treetornkeerati, Montree Hankoy, M. Kitiwan, Mana Rodchom, S. Vichaphund, D. Atong, P. Tunthawiroon","doi":"10.55766/sujst-2023-05-e02854","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e02854","url":null,"abstract":"Aluminum titanate (Al2TiO5) is a promising material for high-temperature applications due to its low thermal expansion, high melting point, and excellent corrosion resistance. In this study, the effect of h-BN addition on the properties of Al2TiO5 composites was investigated. The composites were prepared by sintering a mixture of Al2O3 and TiO2 at a 1:1 molar ratio, with varying amounts of h-BN (5-20 mol%) added to the mixture. The samples were sintered at 1,500ºC for 4 h in an N2 atmosphere, and the bulk density, porosity, phase transition, microstructure, flexural strength, and hardness of the composites were investigated. XRD analysis confirmed the presence of Al2TiO5, Al2O3, and Al18B4O33 phases in the composites. The addition of h-BN in increasing amounts from 5 to 20 mol% resulted in a gradual improvement in the bulk density, flexural strength, and hardness of the Al2TiO5 composites. The composite with the highest h-BN content (20 mol%) exhibited a bulk density of 3.12 g/cm3, as well as the highest flexural strength and hardness values of 123.6±8.9 MPa and 11.2±4.1 GPa, respectively.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"31 12","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138974827","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 : 2023-12-14DOI: 10.55766/sujst-2023-05-e0936
Nontakorn Phakphoom, P. Liplap, J. Wannapeera, Thipsuphin Hinsui, W. Arjharn, Thitikorn kijjanasiri, Kanchanaporn Sribunrueang
In this study, the effect of Refuse-Derived Fuel type 3 (RDF-3) feeding ratio on a performance and a stability of combustion temperature control was exmined. A new direct-combustion furnace was designed and constructed for co-combustion of RDF-3 and woodchip (WC) feedstock. In this work, four main ratios on wet basis of WC and RDF-3; 100 : 0, 90 : 10, 80 : 20, and 70 : 30 wt.% were tested at the combustion temperature of 970°C. The results showed that the complete combustion was achieved from all of feeding ratios. From an actual fuel feed rate, an increase in RDF mixing ratio could reduce the using of pure woodchip by 5.3 wt.%, 14.3 wt.% and 34.0 wt.% when mixing the RDF at 10 wt.%, 20 wt.% and 30 wt.%, respectively. At increasing of RDF mixing ratio, non-smoothy burning was also found to increase, however, a more rapid ignition behavior of was achieved
{"title":"EFFECT OF REFUSE-DERIVED FUEL FEEDING RATIO ON PERFORMANCE AND STABILITY OF COMBUSTION TEMPERATURE CONTROL","authors":"Nontakorn Phakphoom, P. Liplap, J. Wannapeera, Thipsuphin Hinsui, W. Arjharn, Thitikorn kijjanasiri, Kanchanaporn Sribunrueang","doi":"10.55766/sujst-2023-05-e0936","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e0936","url":null,"abstract":"In this study, the effect of Refuse-Derived Fuel type 3 (RDF-3) feeding ratio on a performance and a stability of combustion temperature control was exmined. A new direct-combustion furnace was designed and constructed for co-combustion of RDF-3 and woodchip (WC) feedstock. In this work, four main ratios on wet basis of WC and RDF-3; 100 : 0, 90 : 10, 80 : 20, and 70 : 30 wt.% were tested at the combustion temperature of 970°C. The results showed that the complete combustion was achieved from all of feeding ratios. From an actual fuel feed rate, an increase in RDF mixing ratio could reduce the using of pure woodchip by 5.3 wt.%, 14.3 wt.% and 34.0 wt.% when mixing the RDF at 10 wt.%, 20 wt.% and 30 wt.%, respectively. At increasing of RDF mixing ratio, non-smoothy burning was also found to increase, however, a more rapid ignition behavior of was achieved","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"4 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138973221","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 : 2023-12-14DOI: 10.55766/sujst-2023-05-e03043
Akawat Ngamkiatpaisan, Montree Hankoy, M. Kitiwan, N. Keawprak, P. Tunthawiroon
Microwave hybrid heating (MHH) is a novel method to enhance ceramic sintering at high temperatures. The heating mechanism by MHH involves two directions of heat transfer for materials: microwaves heat the sample from the inside out, while the susceptor provides conventional heating from the outside. This unique heating mechanism offers several advantages, including uniform heating, rapid sintering, and enhanced microstructure and properties of materials. This study investigates the configuration of silicon carbide (SiC) susceptors for microwave hybrid heating. The microwave oven (multi-mode, 2.45 GHz, 1.2 kW) was modified with a ceramic insulator housing to maintain the temperature in the chamber. The effects of different configurations of SiC susceptors and microwave powers on the heating rate and maximum temperature were investigated. SiC susceptor plates were placed in the microwave oven using 3 different configurations, and for each condition, the microwave power was varied at 40, 60, 80, and 100% (480, 720, 960, and 1,200 W). The temperature in the microwave chamber was recorded until it reached 900°C or after 30 min of heating. Using two plates of SiC susceptor at 100 % power resulted in the highest heating rate of 62°C/min to reach 925°C. The results of this study offer guidance for the selection of appropriate heating conditions for individual ceramic materials, which can lead to more effective sintering processes.
{"title":"A STUDY ON SiC SUSCEPTOR CONFIGURATION FOR MICROWAVE HYBRID HEATING","authors":"Akawat Ngamkiatpaisan, Montree Hankoy, M. Kitiwan, N. Keawprak, P. Tunthawiroon","doi":"10.55766/sujst-2023-05-e03043","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e03043","url":null,"abstract":"Microwave hybrid heating (MHH) is a novel method to enhance ceramic sintering at high temperatures. The heating mechanism by MHH involves two directions of heat transfer for materials: microwaves heat the sample from the inside out, while the susceptor provides conventional heating from the outside. This unique heating mechanism offers several advantages, including uniform heating, rapid sintering, and enhanced microstructure and properties of materials. This study investigates the configuration of silicon carbide (SiC) susceptors for microwave hybrid heating. The microwave oven (multi-mode, 2.45 GHz, 1.2 kW) was modified with a ceramic insulator housing to maintain the temperature in the chamber. The effects of different configurations of SiC susceptors and microwave powers on the heating rate and maximum temperature were investigated. SiC susceptor plates were placed in the microwave oven using 3 different configurations, and for each condition, the microwave power was varied at 40, 60, 80, and 100% (480, 720, 960, and 1,200 W). The temperature in the microwave chamber was recorded until it reached 900°C or after 30 min of heating. Using two plates of SiC susceptor at 100 % power resulted in the highest heating rate of 62°C/min to reach 925°C. The results of this study offer guidance for the selection of appropriate heating conditions for individual ceramic materials, which can lead to more effective sintering processes.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"3 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138972858","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 : 2023-12-13DOI: 10.55766/sujst-2023-04-e02268
Saracha Kitchagan, Phannaphat Phromphen, A. Soontrunnarudrungsri, Pithalai Phoophat
The market for bedding products in Thailand now offers a wide range of physical attributes (fiber types, structures, fabric densities, thicknesses, and weights) that produce a variety of tactile sensations and comfort qualities. This study investigated the comfort properties of bedding fabrics in Thailand. Twenty-one bedding fabric samples were collected and measured for their mechanical and surface properties based on the Kawabata evaluation system for fabric (KES-F) as well as the horizontal wicking test and abrasion resistance, air permeability, wrinkle recovery, and thermal resistance (Qmax). The primary hand value (HV) and total hand value (THV) were calculated using the Kawabata hand evaluation equation KN-201-LDY describing women's thin dress fabric, using 5 different properties from the KES-F (tensile, shear, bending, compression, and surface friction). The principle component analysis (PCA) and cluster analysis of the physical properties of fabric samples showed that the samples could be placed in 4 groups. The first group was mostly cotton woven samples. The second group consisted of 2 samples that were both knitted, while the third group was mostly mixed (M) fabric samples. The last group contained cotton and M cotton samples. The first cluster was considered to provide the best hand-feel characteristics of all 4 clusters, while the second cluster was considered the least desirable based on hand-feel. The findings of this study should assist the bedding textile sector in developing new products.
{"title":"PHYSICAL PROPERTIES CORRESPONDING TO COMFORT FEEL OF BEDDING FABRICS","authors":"Saracha Kitchagan, Phannaphat Phromphen, A. Soontrunnarudrungsri, Pithalai Phoophat","doi":"10.55766/sujst-2023-04-e02268","DOIUrl":"https://doi.org/10.55766/sujst-2023-04-e02268","url":null,"abstract":"The market for bedding products in Thailand now offers a wide range of physical attributes (fiber types, structures, fabric densities, thicknesses, and weights) that produce a variety of tactile sensations and comfort qualities. This study investigated the comfort properties of bedding fabrics in Thailand. Twenty-one bedding fabric samples were collected and measured for their mechanical and surface properties based on the Kawabata evaluation system for fabric (KES-F) as well as the horizontal wicking test and abrasion resistance, air permeability, wrinkle recovery, and thermal resistance (Qmax). The primary hand value (HV) and total hand value (THV) were calculated using the Kawabata hand evaluation equation KN-201-LDY describing women's thin dress fabric, using 5 different properties from the KES-F (tensile, shear, bending, compression, and surface friction). The principle component analysis (PCA) and cluster analysis of the physical properties of fabric samples showed that the samples could be placed in 4 groups. The first group was mostly cotton woven samples. The second group consisted of 2 samples that were both knitted, while the third group was mostly mixed (M) fabric samples. The last group contained cotton and M cotton samples. The first cluster was considered to provide the best hand-feel characteristics of all 4 clusters, while the second cluster was considered the least desirable based on hand-feel. The findings of this study should assist the bedding textile sector in developing new products.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"111 4","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139003683","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 : 2023-12-13DOI: 10.55766/sujst-2023-05-e01092
S. Rattanachan, Rawee Dangwiriyakul, Oranich Thongsri, Paritat Thaitalay, Sawitri Srisuwan
Concrete durability to salt resistance is the main factor affecting the service life of concrete used in acid or salt environment. This project aims to develop the concrete composition for salt resistance of chloride and sulfate at 50,000 mg/L as the simulated salt solution in this project. Geopolymer consisted of 10%wt ordinary Portland cement (OPC type 1) with the other alternative raw materials which were pozzolanic materials and wastes (fly ash, silica fume and rice husk ash). The various parameters which were type and content of the alternative raw materials, plasticizers content, liquid to powder ratio, etc, were studied for developing the compressive strength of geopolymer after soaking in the simulated salt solution for 14 days as comparison with those in the normal water and the ordinary Portland cement. The results found that geopolymer consisted of fly ash and silica fume with the mixture of NaOH (10M): Na2SiO3 in a ratio of 24:16 (wt./wt.) could improve the compressive strength of geopolymer cement after soaking in the simulated sulfate salt solution for 14 days as compared to the ordinary Portland cement type 1 and type 5. Moreover, this geopolymer showed low density which was beneficial for use in the engineering structure in the high salt area. In addition, the change of chemical reaction and phases after setting of geopolymer in high concentrations of chloride and sulfate solution were studied to understand the mechanism of salt resistance of geopolymer and to develop the concrete composition for salt resistance in the future.
{"title":"Resistance of Chloride and Sulfate of Geopolymer based on fly ash and silica fume as alternative raw materials.","authors":"S. Rattanachan, Rawee Dangwiriyakul, Oranich Thongsri, Paritat Thaitalay, Sawitri Srisuwan","doi":"10.55766/sujst-2023-05-e01092","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e01092","url":null,"abstract":"Concrete durability to salt resistance is the main factor affecting the service life of concrete used in acid or salt environment. This project aims to develop the concrete composition for salt resistance of chloride and sulfate at 50,000 mg/L as the simulated salt solution in this project. Geopolymer consisted of 10%wt ordinary Portland cement (OPC type 1) with the other alternative raw materials which were pozzolanic materials and wastes (fly ash, silica fume and rice husk ash). The various parameters which were type and content of the alternative raw materials, plasticizers content, liquid to powder ratio, etc, were studied for developing the compressive strength of geopolymer after soaking in the simulated salt solution for 14 days as comparison with those in the normal water and the ordinary Portland cement. The results found that geopolymer consisted of fly ash and silica fume with the mixture of NaOH (10M): Na2SiO3 in a ratio of 24:16 (wt./wt.) could improve the compressive strength of geopolymer cement after soaking in the simulated sulfate salt solution for 14 days as compared to the ordinary Portland cement type 1 and type 5. Moreover, this geopolymer showed low density which was beneficial for use in the engineering structure in the high salt area. In addition, the change of chemical reaction and phases after setting of geopolymer in high concentrations of chloride and sulfate solution were studied to understand the mechanism of salt resistance of geopolymer and to develop the concrete composition for salt resistance in the future.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"51 2","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139005551","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 : 2023-12-13DOI: 10.55766/sujst-2023-05-e03009
Kittipun Boonin, Pattarawagee Yasaka, J. Kaewkhao, N. Sangwaranatee
Tellurite glasses with different concentration of praseodymium (Pr3+) ion was produced by melt-quenching technique. The effect of Pr3+ concentration on optical and luminescence properties was presented. The optical absorption spectra of Pr3+ ions in glasses were recorded in the UV-VIS-NIR region. By using the integrated absorption spectrum, the Judd-ofelt parameters for Pr3+ ions were derived. The Judd-Ofelt theory was used to calculate the radiative transition probability, stimulated emission cross-section, and branching ratio of the glasses. These findings support the use of these glasses in laser and other optical device applications.
{"title":"EFFECT OF PRASEODYMIUM ION CONCENTRATION ON OPTICAL AND LUMINESCENCE PROPERTIES OF TELLURITE GLASSES PRODUCED BY MELT-QUENCHING TECHNIQUE","authors":"Kittipun Boonin, Pattarawagee Yasaka, J. Kaewkhao, N. Sangwaranatee","doi":"10.55766/sujst-2023-05-e03009","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e03009","url":null,"abstract":"Tellurite glasses with different concentration of praseodymium (Pr3+) ion was produced by melt-quenching technique. The effect of Pr3+ concentration on optical and luminescence properties was presented. The optical absorption spectra of Pr3+ ions in glasses were recorded in the UV-VIS-NIR region. By using the integrated absorption spectrum, the Judd-ofelt parameters for Pr3+ ions were derived. The Judd-Ofelt theory was used to calculate the radiative transition probability, stimulated emission cross-section, and branching ratio of the glasses. These findings support the use of these glasses in laser and other optical device applications.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"45 6","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139003258","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 : 2023-12-13DOI: 10.55766/sujst-2023-04-e0229
Karthik Rajaram mohan, Saramma Mathew Fenn, Ramachandra Reddy
Clustered Regularly Interspaced Short Palindromic Repeats is termed as CRISPR. Bacteria having "spacer" sequences of deoxyribonucleic acid between the repeats of genomic sequences that resemble genomic sequences in viruses were found to have repetitive DNA sequences known as CRISPR.The CRISPR technology in genetic engineering has revolutionalized the field of medicine in treating various genetically linked diseases that are difficult to treat such as Lebers Congenital amaurosis, in which there is bi-allelic deletion caused by mutation in mitochondrial DNA MT-ND4(NADH ubiquinone oxidoreductase chain4) 1178G are treated by intravitreous injection of AAV2-ND4 produced by CRISPR-Cas9 genomic editing technology.CRISPR-Cas9 genomic editing is used to remove the expression of receptor Enhancer Protein-6 (Reep6 p.Leu135Pro ) gene that causes retinitis pigmentosa. Open angle Glaucoma caused by mutations in myocilin (MYOR) gene was effectively removed out by CRISPR-Cas9 editing technology. Mutation in KRT-12 gene that caused Meesman epithelial corneal dystrophy ( MECD) was alleviated by Cas9/sgRNA injection into the stroma of cornea. CRISPR-Cas9 genomic sequencing used in the treatment of Haemophilia -B , an inherited disease caused by mutation of factor IX gene Y371D was successfully modified by CRISPR-
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Pub Date : 2023-12-13DOI: 10.55766/sujst-2023-03-e03028
C. Panjapornpon, Siriwatida Srirabai
Monitoring process status and identifying process operational faults are essential for improving the process safety in petrochemical plants that interactions between various process streams and units are associated. This paper presents a deployment of a support vector machine technique for detecting and identifying operational fault cases with a case study of a vinyl chloride monomer plant. An integrated simulation environment between MATLAB and UniSim Design dynamic simulator is utilized for evaluating the performance of the proposed fault detection and identification framework. Under the real-time software-in-the-loop simulation, the confusion matrix results and receiver operating characteristics supported that the proposed framework provides high accuracy of fault classification.
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