Artocarpus odoratissimus Blanco, or terap, is an indigenous fruit of Borneo that is popular for its strong fruity aroma and sweet juicy flesh, which is gaining visibility in the local fruit industry. Due to increasing demands and attributes of this fruit in recent years locally and internationally, the species has great potential to be commercialized. Selecting an appropriate substrate is one of the most pivotal stages in producing quality seedlings in a nursery. Consequently, the present study focuses on evaluating the synergistic effects of the substrate composition with effective microorganisms, i.e., Trichoderma harzianum, Bacillus subtilis, and Arbuscular mycorrhizal fungi (AMF), and in all possible combinations, on the growth and development of the A. odoratissimus seedlings. The pot experiment was designed following the Completely Randomized Design (CRD) with eight replications per treatment. Among the substrates, significantly higher (p<0.05) plant height was recorded in the seedlings treated with combined inoculants, T7 (Soil + AMF + T. harzianum + B. subtilis) at 47.13±10.80 cm or in a single inoculant, T3 (Soil + B. subtilis) at 46.83±2.63 cm. Subsequently, T7 and T3 have significantly improved the collar diameter and leaf area of A. odoratissimus seedlings. Concerning the physiological parameters, the synergistic triple treatment (T7) improved the underground fresh and dry biomass production at 32.33±3.21 g and 11.66±1.08 g, respectively. The same combination exhibited a more significant (p<0.05) Dickson’s Quality Index (0.72±0.03), improving the original development of A. odoratissimus seedlings. Microbial application tended to mitigate ion imbalances in plants and significantly affected the soil total nitrogen, available P, and available K and pH. These effects were most prominent in the treatments comprising triple inoculations of T7. Results suggest that the combination of T. harzianum, B. subtilis, and AMF leads to interactions that may potentially improve seedling development and crop productivity in A. odoratissimus.
Artocarpus odoratissimus Blanco 或 terap 是婆罗洲的一种土著水果，因其浓郁的果香和甜美多汁的果肉而广受欢迎，在当地水果行业的知名度越来越高。由于近年来当地和国际上对这种水果的需求和属性不断增加，该品种具有很大的商业化潜力。选择合适的基质是苗圃培育优质幼苗最关键的阶段之一。因此，本研究的重点是评估基质成分与有效微生物（即毛霉菌、枯草芽孢杆菌和丛枝菌根真菌（AMF））的各种可能组合对 A. odoratissimus 幼苗生长和发育的协同效应。盆栽实验采用完全随机设计法（CRD），每个处理有八个重复。在各种基质中，使用联合接种剂 T7（土壤 + AMF + T. harzianum + B. subtilis）处理的幼苗的株高为 47.13±10.80 厘米，使用单一接种剂 T3（土壤 + B. subtilis）处理的幼苗的株高为 46.83±2.63 厘米。随后，T7 和 T3 显著改善了 A. odoratissimus 幼苗的叶领直径和叶面积。在生理参数方面，三重协同处理（T7）提高了地下鲜、干生物量产量，分别为（32.33±3.21）克和（11.66±1.08）克。同样的组合表现出更显著的迪克森质量指数（0.72±0.03）（p<0.05），改善了 A. odoratissimus 幼苗的原始发育。施用微生物往往能缓解植物体内的离子失衡，并对土壤全氮、可利用磷、可利用钾和 pH 值产生显著影响。这些影响在三重接种 T7 的处理中最为突出。研究结果表明，T. harzianum、枯草芽孢杆菌和AMF的组合会产生相互作用，有可能改善A. odoratissimus的幼苗发育和作物产量。
{"title":"Synergistic Effects of Plant Growth-Promoting Microorganisms on Growth and Development of Terap (Artocarpus odoratissimus Blanco) Seedlings","authors":"Goh Ei Ping, S. D. Ramaiya, M. Zakaria","doi":"10.12982/cmjs.2023.071","DOIUrl":"https://doi.org/10.12982/cmjs.2023.071","url":null,"abstract":"Artocarpus odoratissimus Blanco, or terap, is an indigenous fruit of Borneo that is popular for its strong fruity aroma and sweet juicy flesh, which is gaining visibility in the local fruit industry. Due to increasing demands and attributes of this fruit in recent years locally and internationally, the species has great potential to be commercialized. Selecting an appropriate substrate is one of the most pivotal stages in producing quality seedlings in a nursery. Consequently, the present study focuses on evaluating the synergistic effects of the substrate composition with effective microorganisms, i.e., Trichoderma harzianum, Bacillus subtilis, and Arbuscular mycorrhizal fungi (AMF), and in all possible combinations, on the growth and development of the A. odoratissimus seedlings. The pot experiment was designed following the Completely Randomized Design (CRD) with eight replications per treatment. Among the substrates, significantly higher (p<0.05) plant height was recorded in the seedlings treated with combined inoculants, T7 (Soil + AMF + T. harzianum + B. subtilis) at 47.13±10.80 cm or in a single inoculant, T3 (Soil + B. subtilis) at 46.83±2.63 cm. Subsequently, T7 and T3 have significantly improved the collar diameter and leaf area of A. odoratissimus seedlings. Concerning the physiological parameters, the synergistic triple treatment (T7) improved the underground fresh and dry biomass production at 32.33±3.21 g and 11.66±1.08 g, respectively. The same combination exhibited a more significant (p<0.05) Dickson’s Quality Index (0.72±0.03), improving the original development of A. odoratissimus seedlings. Microbial application tended to mitigate ion imbalances in plants and significantly affected the soil total nitrogen, available P, and available K and pH. These effects were most prominent in the treatments comprising triple inoculations of T7. Results suggest that the combination of T. harzianum, B. subtilis, and AMF leads to interactions that may potentially improve seedling development and crop productivity in A. odoratissimus.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"14 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139200214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wen-Hua Lu, S. Tibpromma, J. Kumla, Dong-Qin Dai, Samantha C. Karunarathna, Xiao-Yan Wang
During t he investigation of Basidiomycetes at Qujing, Yunnan Province, China, some interesting mushroom specimens were collected at the Qujing Normal University premises. Based on their unique morphology, we preliminarily identified them as Agaricus species. Further analyses based on internal transcribed spacer (ITS) region and micro-morphological characteristics confirmed that the collected specimens represent two known species viz. A. andrewii and A. xanthodermulus belonged to Agaricus sections Agaricus and Xanthodermatei, respectively. These two species are reported here as new records to China. Full Descriptions, color plates, and a phylogenetic tree to show the placement of two species are provided.
{"title":"https://epg.science.cmu.ac.th/ejournal/journal-detail.php?id=11761","authors":"Wen-Hua Lu, S. Tibpromma, J. Kumla, Dong-Qin Dai, Samantha C. Karunarathna, Xiao-Yan Wang","doi":"10.12982/cmjs.2023.061","DOIUrl":"https://doi.org/10.12982/cmjs.2023.061","url":null,"abstract":"During t he investigation of Basidiomycetes at Qujing, Yunnan Province, China, some interesting mushroom specimens were collected at the Qujing Normal University premises. Based on their unique morphology, we preliminarily identified them as Agaricus species. Further analyses based on internal transcribed spacer (ITS) region and micro-morphological characteristics confirmed that the collected specimens represent two known species viz. A. andrewii and A. xanthodermulus belonged to Agaricus sections Agaricus and Xanthodermatei, respectively. These two species are reported here as new records to China. Full Descriptions, color plates, and a phylogenetic tree to show the placement of two species are provided.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"17 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139205752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rizky Arif Fajar Husandy Ritonga, B. Arifin, P. Sugita, S. Achmadi, L. Irfana
A ryltetralin and arylnaphthalene lignans consisting of methylenedioxy or trimethoxy groups, such as podophyllotoxin and phyllanthusmin C, are known to have effective anticancer properties. The synthesis of these compounds can be achieved through intramolecular Diels-Alder reactions on cinnamyl cinnamate ester derivatives. Furthermore, this ester is commonly synthesized through an esterification reaction between cinnamoyl halide and cinnamyl alcohol. In this study, cinnamyl cinnamate only produced a 41% yield, while a nearly quantitative yield of 98% was obtained using the Steglich reaction with N,N’-dicyclohexylcarbodiimide and 4-dimethylaminopyridine. This reaction was used to synthesize eight cinnamyl cinnamate ester derivatives, which consisted of methylenedioxy and trimethoxy groups, following a combinatorial synthesis. 3,4-Methylenedioxy- and 3,4,5-trimethoxycinnamyl alcohols were obtained by reducing methyl 3,4-methylenedioxycinnamate and 3,4,5-trimethoxycinnamic acid, respectively. The results showed that the ester yields were excellent, except for the ester derivatives of 3,4,5-trimethoxycinnamyl alcohol. This alcohol was unstable during column chromatography, leading to the direct esterification of the crude reduction products. A side product with Rf adjacent to the ester was obtained, thereby reducing the ester yield. The identification of this by-product and the intramolecular Diels-Alder reaction on the products obtained were described in this study. Computational studies showed that transforming reactants into products led to the production of one intermediate compound and two transition states (TS). Each TS represented the intramolecular Diels-Alder cycloaddition reaction and migration of [1,3]-hydrogen. Thermodynamic studies consistently revealed that a solvent environment could effectively reduce the activation energy associated with a chemical process.
{"title":"Steglich Esterification of Activated Cinnamyl Cinnamate Derivatives and Computational Studies of Intramolecular Diels-Alder for Lignan Synthesis","authors":"Rizky Arif Fajar Husandy Ritonga, B. Arifin, P. Sugita, S. Achmadi, L. Irfana","doi":"10.12982/cmjs.2023.058","DOIUrl":"https://doi.org/10.12982/cmjs.2023.058","url":null,"abstract":"A ryltetralin and arylnaphthalene lignans consisting of methylenedioxy or trimethoxy groups, such as podophyllotoxin and phyllanthusmin C, are known to have effective anticancer properties. The synthesis of these compounds can be achieved through intramolecular Diels-Alder reactions on cinnamyl cinnamate ester derivatives. Furthermore, this ester is commonly synthesized through an esterification reaction between cinnamoyl halide and cinnamyl alcohol. In this study, cinnamyl cinnamate only produced a 41% yield, while a nearly quantitative yield of 98% was obtained using the Steglich reaction with N,N’-dicyclohexylcarbodiimide and 4-dimethylaminopyridine. This reaction was used to synthesize eight cinnamyl cinnamate ester derivatives, which consisted of methylenedioxy and trimethoxy groups, following a combinatorial synthesis. 3,4-Methylenedioxy- and 3,4,5-trimethoxycinnamyl alcohols were obtained by reducing methyl 3,4-methylenedioxycinnamate and 3,4,5-trimethoxycinnamic acid, respectively. The results showed that the ester yields were excellent, except for the ester derivatives of 3,4,5-trimethoxycinnamyl alcohol. This alcohol was unstable during column chromatography, leading to the direct esterification of the crude reduction products. A side product with Rf adjacent to the ester was obtained, thereby reducing the ester yield. The identification of this by-product and the intramolecular Diels-Alder reaction on the products obtained were described in this study. Computational studies showed that transforming reactants into products led to the production of one intermediate compound and two transition states (TS). Each TS represented the intramolecular Diels-Alder cycloaddition reaction and migration of [1,3]-hydrogen. Thermodynamic studies consistently revealed that a solvent environment could effectively reduce the activation energy associated with a chemical process.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"35 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139208639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fatimah Alshahrani, O. Fetitah, I. Almanjahie, M. Attouch
As weather warms up in China, ozone pollution rises to the top of the list of air pollutants. In this research, we examine the spatiotemporal variability of particulate matter components using contemporary functional data analysis techniques. The technique models the yearly pollutant profiles to describe their dynamic behavior over time and location. These cutting-edge methods offer dimension reduction for better data display and permit us to forecast annual profiles for locations and years for which data are lacking. In order to accurately estimate hourly ozone concentrations for 12 stations in China over two years (2015-2016), this study set out to showcase the best prediction models currently available. To accurately predict Ozone concentration, several methods are used, including Kernel Functional Classical Estimation (KFCE), Kernel Functional Quantile estimation (KFQE), Semi-Partial Linear Functional Classical Estimation (SPLFCE), Semi-Partial Linear Functional Quantile Estimation (SPLFQE), and Semi-Partial Linear Functional Expectile Estimation (SPLFEE). These functional models were chosen based on their ability to establish a forecast region with a given level of confidence. In terms of prediction accuracy, we may conclude that the Semi-Partial linear models outperform conventional models.
{"title":"Spatiotemporal Analysis of Ozone Concentration Using Semi-Functional Partial Linear Models","authors":"Fatimah Alshahrani, O. Fetitah, I. Almanjahie, M. Attouch","doi":"10.12982/cmjs.2023.075","DOIUrl":"https://doi.org/10.12982/cmjs.2023.075","url":null,"abstract":"As weather warms up in China, ozone pollution rises to the top of the list of air pollutants. In this research, we examine the spatiotemporal variability of particulate matter components using contemporary functional data analysis techniques. The technique models the yearly pollutant profiles to describe their dynamic behavior over time and location. These cutting-edge methods offer dimension reduction for better data display and permit us to forecast annual profiles for locations and years for which data are lacking. In order to accurately estimate hourly ozone concentrations for 12 stations in China over two years (2015-2016), this study set out to showcase the best prediction models currently available. To accurately predict Ozone concentration, several methods are used, including Kernel Functional Classical Estimation (KFCE), Kernel Functional Quantile estimation (KFQE), Semi-Partial Linear Functional Classical Estimation (SPLFCE), Semi-Partial Linear Functional Quantile Estimation (SPLFQE), and Semi-Partial Linear Functional Expectile Estimation (SPLFEE). These functional models were chosen based on their ability to establish a forecast region with a given level of confidence. In terms of prediction accuracy, we may conclude that the Semi-Partial linear models outperform conventional models.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"23 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139209038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M ultimetallic nanocatalysts have remarkably revealed activities in various catalytic applications. Herein, the ternary nanocatalysts based on palladium-vanadium-cobalt were successfully synthesized through the reduction of their salts with the combination of sodium borohydride and ethylene glycol as reducing agents, including impregnating of activated carbon (AC) substrate with colloid solution of metallic nanoparticles (PdVCo/C). The immobile of trimetallic PdVCo on AC was evidenced by XRD, EDX analysis, transmission electron microscopy (TEM) and specific surface area (BET). Therein, TEM imaging showed that the PdVCo particles size is about 7 nm. The trimetallic nanocatalysts were evaluated in the hydrodechlorination of dichlorinated substrates which was defined by GC (FID detector). The obtained result was that the conversion of 2,4-dichlorophenol was over 91% in the case of PdVCo nano-catalyst in the presence of potassium hydroxide and the high catalytic stability was observed.
{"title":"Carbon-supported Ternary Nanocatalyst Palladium-Vanadium-Cobalt for Hydrodechlorination of 2,4-Dichlorophenol","authors":"Thi Duyen Diep, Thi Yen Nhi Nguyen, T. Co","doi":"10.12982/cmjs.2023.069","DOIUrl":"https://doi.org/10.12982/cmjs.2023.069","url":null,"abstract":"M ultimetallic nanocatalysts have remarkably revealed activities in various catalytic applications. Herein, the ternary nanocatalysts based on palladium-vanadium-cobalt were successfully synthesized through the reduction of their salts with the combination of sodium borohydride and ethylene glycol as reducing agents, including impregnating of activated carbon (AC) substrate with colloid solution of metallic nanoparticles (PdVCo/C). The immobile of trimetallic PdVCo on AC was evidenced by XRD, EDX analysis, transmission electron microscopy (TEM) and specific surface area (BET). Therein, TEM imaging showed that the PdVCo particles size is about 7 nm. The trimetallic nanocatalysts were evaluated in the hydrodechlorination of dichlorinated substrates which was defined by GC (FID detector). The obtained result was that the conversion of 2,4-dichlorophenol was over 91% in the case of PdVCo nano-catalyst in the presence of potassium hydroxide and the high catalytic stability was observed.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"15 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139200157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An amperometric bi-enzyme biosensor based on α-chymotrypsin (CHY) and alcohol oxidase (AOX) was developed for detection of aspartame in a flow injection analysis (FIA) system. The CHY and AOX were separately immobilized on bead supports using an adsorption technique. The cleavage of aspartame was catalyzed by CHY to produce methanol that was converted by AOX to formaldehyde and hydrogen peroxide. The formed hydrogen peroxide was detected amperometrically at a platinum electrode. The biosensor performance was optimized with respect to enzyme immobilization and operating conditions. The most suitable conditions for enzyme immobilization were 250 U/mL CHY and 100 U/mL AOX with 60 min immobilization time. The optimal conditions for operating the developed aspartame biosensor were a flow rate of 0.5 mL/min and pH 8.0 at an applied potential of +0.70 V versus Ag/AgCl. Under the optimal conditions, the developed biosensor showed a linear response over the aspartame concentration range 0.15–1.0 mM (coefficient of determination (R2) = 0.9941) with a sensitivity of 5.52 μA/mM·cm2 and a detection limit of 0.10 mM. The developed biosensor was successfully applied in the determination of aspartame in commercial samples.
{"title":"Development and Optimization of an Amperometric Bi-enzyme Biosensor for Aspartame Determination","authors":"Tanaporn Tangtawewipat, S. Thanachasai","doi":"10.12982/cmjs.2023.064","DOIUrl":"https://doi.org/10.12982/cmjs.2023.064","url":null,"abstract":"An amperometric bi-enzyme biosensor based on α-chymotrypsin (CHY) and alcohol oxidase (AOX) was developed for detection of aspartame in a flow injection analysis (FIA) system. The CHY and AOX were separately immobilized on bead supports using an adsorption technique. The cleavage of aspartame was catalyzed by CHY to produce methanol that was converted by AOX to formaldehyde and hydrogen peroxide. The formed hydrogen peroxide was detected amperometrically at a platinum electrode. The biosensor performance was optimized with respect to enzyme immobilization and operating conditions. The most suitable conditions for enzyme immobilization were 250 U/mL CHY and 100 U/mL AOX with 60 min immobilization time. The optimal conditions for operating the developed aspartame biosensor were a flow rate of 0.5 mL/min and pH 8.0 at an applied potential of +0.70 V versus Ag/AgCl. Under the optimal conditions, the developed biosensor showed a linear response over the aspartame concentration range 0.15–1.0 mM (coefficient of determination (R2) = 0.9941) with a sensitivity of 5.52 μA/mM·cm2 and a detection limit of 0.10 mM. The developed biosensor was successfully applied in the determination of aspartame in commercial samples.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"96 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139206918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jenjinta Punyasurb, S. Wattanasiriwech, D. Wattanasiriwech
In order to reduce the negative impact of waste glass and urban heat on the environment, this research aims to use waste glass cullet as an aggregate in concrete paving blocks. This work aims to produce porous pavement using two sizes of waste glass and ordinary Portland cement (OPC). Two layers of paving blocks with different aggregate sizes were planned. The first part of the work was to determine the best OPC content. The results showed that the largest aggregate-based porous paving block had the highest compressive strength and acceptable permeability. Then, designed porous block (DPB) was designed, which consisted of two layers, with the upper layer consisting of small aggregates and the lower layer consisting of large aggregates, and cement mortar (80 wt% cement powder and 20 wt% glass powder) was used as the binder. Compressive strength and permeability were the criteria. The pavement can release heat better than conventional pavements and is safe because of the skid resistance, which meets the criteria.
{"title":"Permeable Blocks with Waste Glass as Coarse Aggregate","authors":"Jenjinta Punyasurb, S. Wattanasiriwech, D. Wattanasiriwech","doi":"10.12982/cmjs.2023.062","DOIUrl":"https://doi.org/10.12982/cmjs.2023.062","url":null,"abstract":"In order to reduce the negative impact of waste glass and urban heat on the environment, this research aims to use waste glass cullet as an aggregate in concrete paving blocks. This work aims to produce porous pavement using two sizes of waste glass and ordinary Portland cement (OPC). Two layers of paving blocks with different aggregate sizes were planned. The first part of the work was to determine the best OPC content. The results showed that the largest aggregate-based porous paving block had the highest compressive strength and acceptable permeability. Then, designed porous block (DPB) was designed, which consisted of two layers, with the upper layer consisting of small aggregates and the lower layer consisting of large aggregates, and cement mortar (80 wt% cement powder and 20 wt% glass powder) was used as the binder. Compressive strength and permeability were the criteria. The pavement can release heat better than conventional pavements and is safe because of the skid resistance, which meets the criteria.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"48 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139202412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wiphawee Jiamjai, K. Inyawilert, M. Punginsang, M. Siriwalai, A. Wisitsoraat, C. Liewhiran
In this w ork, effective gas-sensing material were prepared by combining spinel zinc stannate (Zn2SnO4) nanoparticles synthesized by flame spray pyrolysis and graphene produced by the electrolytic exfoliation for volatile organic acids (VOAs) detection. The effect of graphene content in the range of 0.2–5 wt% on formic acid (HCOOH)-sensing performance of Zn2SnO4 nanoparticles was evaluated. Structural, physical, and chemical properties were investigated using X-ray diffraction, Raman spectroscopy, BET-surface analysis, energy dispersive X-ray spectroscopy, and electron microscopy. From the gas-sensing test towards 0.005-0.1 vol% HCOOH in dry air at 200-400°C, the graphene-loaded Zn2SnO4 sensor with the optimal graphene content of 0.5 wt% displayed the highest response of ~4970 towards HCOOH at the optimal temperature of 300°C. Moreover, it showed high HCOOH selectivity against several other VOAs, volatile organic compounds, and environmental gases. Therefore, graphene-loaded spinel Zn2SnO4 sensors could be attractive choices for selective HCOOH detection and useful for food science and industrial applications.
{"title":"Formic Acid Gas Sensors Based on Electrolytically Exfoliated Graphene-loaded Flame-Made Spinel Zn2SnO4 Composites","authors":"Wiphawee Jiamjai, K. Inyawilert, M. Punginsang, M. Siriwalai, A. Wisitsoraat, C. Liewhiran","doi":"10.12982/cmjs.2023.068","DOIUrl":"https://doi.org/10.12982/cmjs.2023.068","url":null,"abstract":"In this w ork, effective gas-sensing material were prepared by combining spinel zinc stannate (Zn2SnO4) nanoparticles synthesized by flame spray pyrolysis and graphene produced by the electrolytic exfoliation for volatile organic acids (VOAs) detection. The effect of graphene content in the range of 0.2–5 wt% on formic acid (HCOOH)-sensing performance of Zn2SnO4 nanoparticles was evaluated. Structural, physical, and chemical properties were investigated using X-ray diffraction, Raman spectroscopy, BET-surface analysis, energy dispersive X-ray spectroscopy, and electron microscopy. From the gas-sensing test towards 0.005-0.1 vol% HCOOH in dry air at 200-400°C, the graphene-loaded Zn2SnO4 sensor with the optimal graphene content of 0.5 wt% displayed the highest response of ~4970 towards HCOOH at the optimal temperature of 300°C. Moreover, it showed high HCOOH selectivity against several other VOAs, volatile organic compounds, and environmental gases. Therefore, graphene-loaded spinel Zn2SnO4 sensors could be attractive choices for selective HCOOH detection and useful for food science and industrial applications.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"39 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139208341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A second-or der RC equivalent circuit model was established to improve the estimation accuracy of state of charge (SOC) of power Li-ion batteries, and the model parameters were identified by the recursive least square method with forgetting factor (FFRLS). On this basis, an adaptive cubature kalman filter (ACKF) algorithm was proposed to adaptively modify the process noise covariance matrix and the measurement noise covariance matrix to improve the SOC estimation accuracy. Finally, the SOC estimation algorithm was verified by MATLAB simulations. The results show that compared with UKF and CKF algorithms, the proposed algorithm has higher estimation accuracy and robustness, and can meet the application requirements.
{"title":"Soc Estimation of Li-ion Battery Based on Adaptive CKF Algorithm","authors":"Zhengjun Huang, Yu Chen, Meifang Zhou","doi":"10.12982/cmjs.2023.063","DOIUrl":"https://doi.org/10.12982/cmjs.2023.063","url":null,"abstract":"A second-or der RC equivalent circuit model was established to improve the estimation accuracy of state of charge (SOC) of power Li-ion batteries, and the model parameters were identified by the recursive least square method with forgetting factor (FFRLS). On this basis, an adaptive cubature kalman filter (ACKF) algorithm was proposed to adaptively modify the process noise covariance matrix and the measurement noise covariance matrix to improve the SOC estimation accuracy. Finally, the SOC estimation algorithm was verified by MATLAB simulations. The results show that compared with UKF and CKF algorithms, the proposed algorithm has higher estimation accuracy and robustness, and can meet the application requirements.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"78 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139208628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sarunya Sutam, K. Inyawilert, M. Punginsang, M. Siriwalai, A. Wisitsoraat, A. Tuantranont, C. Liewhiran
Gas sensors based on flame-synthesized WO3 nanoparticles loaded with 0.2-5 wt% electrochemically exfoliated graphene were evaluated for NO2 detection at ppb levels. The characterizations by X-Ray diffraction, nitrogen adsorption, electron microscopy and Raman spectrometry verified that multi-layer graphene sheets were well dispersed within spheroidal WO3 nanoparticles. Sensing layers fabricated with different graphene loading levels were tested towards 50-5000 ppb NO2 with varying operating temperatures from 100 to 350 °C in dry air. From the test results, the graphene-loaded WO3 nanoparticles with the optimal graphene content of 2 wt% exhibited the highest sensor response of ~ 5061 to 5000 ppb NO2 at the optimum working temperature of 150 °C. Furthermore, the sensor based on graphene/WO3 composites displayed high NO2 selectivity against various environmental gases and volatile organic compounds at 150 °C. The mechanistic roles of graphene on NO2 gas-sensing performances were described based on reactive ohmic M-S heterointerfaces. Therefore, the combination of electrochemically exfoliated graphene and flame-made WO3 nanoparticles could be an attractive mean to achieve highly sensitive and selective NO2 sensors.
{"title":"Highly Selective NO2 Sensors Based on Electrolytically Exfoliated Graphene/Flame-made WO3 Composite Films","authors":"Sarunya Sutam, K. Inyawilert, M. Punginsang, M. Siriwalai, A. Wisitsoraat, A. Tuantranont, C. Liewhiran","doi":"10.12982/cmjs.2023.067","DOIUrl":"https://doi.org/10.12982/cmjs.2023.067","url":null,"abstract":"Gas sensors based on flame-synthesized WO3 nanoparticles loaded with 0.2-5 wt% electrochemically exfoliated graphene were evaluated for NO2 detection at ppb levels. The characterizations by X-Ray diffraction, nitrogen adsorption, electron microscopy and Raman spectrometry verified that multi-layer graphene sheets were well dispersed within spheroidal WO3 nanoparticles. Sensing layers fabricated with different graphene loading levels were tested towards 50-5000 ppb NO2 with varying operating temperatures from 100 to 350 °C in dry air. From the test results, the graphene-loaded WO3 nanoparticles with the optimal graphene content of 2 wt% exhibited the highest sensor response of ~ 5061 to 5000 ppb NO2 at the optimum working temperature of 150 °C. Furthermore, the sensor based on graphene/WO3 composites displayed high NO2 selectivity against various environmental gases and volatile organic compounds at 150 °C. The mechanistic roles of graphene on NO2 gas-sensing performances were described based on reactive ohmic M-S heterointerfaces. Therefore, the combination of electrochemically exfoliated graphene and flame-made WO3 nanoparticles could be an attractive mean to achieve highly sensitive and selective NO2 sensors.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"23 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139208991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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