Jie Chen, Zhijun Wang, H. Zhang, Qingxiang Yang, Hongtao Zhang, Ruo-Xun Zhai
In this study, the working environment of the GH4720Li alloy was simulated using a dynamic compression test with a strain rate range of 0.01–4000 s-1 and a temperature range of 20–1000 °C, and its dynamic mechanical properties under operating conditions were studied. Based on the signifi cant volume of the test data, it was observed that there was an abnormal stress peak in the GH4720Li alloy owing to third strain aging. The third strain aging behavior is an irregular bell-shaped stress curve. In addition, the effects of the temperature and strain rate on the bell-shaped stress curve were studied. With an increase in the strain rate, the bell-shaped stress curve shifted to the high-temperature zone, and the stress peak and temperature width of the bell-shaped curve gradually decreased. Finally, the change mechanism of the strain rate effect on the bell-shaped stress curve is explained from a microscopic point of view.
{"title":"Third-type of Strain Aging of GH4720Li Over a Wide Range of Temperatures and Strain Rates","authors":"Jie Chen, Zhijun Wang, H. Zhang, Qingxiang Yang, Hongtao Zhang, Ruo-Xun Zhai","doi":"10.12982/cmjs.2022.088","DOIUrl":"https://doi.org/10.12982/cmjs.2022.088","url":null,"abstract":"In this study, the working environment of the GH4720Li alloy was simulated using a dynamic compression test with a strain rate range of 0.01–4000 s-1 and a temperature range of 20–1000 °C, and its dynamic mechanical properties under operating conditions were studied. Based on the signifi cant volume of the test data, it was observed that there was an abnormal stress peak in the GH4720Li alloy owing to third strain aging. The third strain aging behavior is an irregular bell-shaped stress curve. In addition, the effects of the temperature and strain rate on the bell-shaped stress curve were studied. With an increase in the strain rate, the bell-shaped stress curve shifted to the high-temperature zone, and the stress peak and temperature width of the bell-shaped curve gradually decreased. Finally, the change mechanism of the strain rate effect on the bell-shaped stress curve is explained from a microscopic point of view.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"92 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83565281","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}
Adsorption is one of the effective methods used for the removal of contaminants from radioactive wastewater. In this research, removal efficiency of Cs from the prepared low-concentration Cs solution (100 μg/L) was studied using two different adsorbents namely high purity Kunipia-F bentonite and Silicon dioxide (SiO2). After performing the adsorption tests, the Cs ions in liquid and solid phases were analyzed using the inductively coupled plasma mass spectrometry (ICP-MS) technique. The adsorption capacities of both materials were then compared. It was found that the Cs adsorption capacity of bentonite was higher than that of SiO2. The distribution coefficient of Cs in the bentonite was 1.0 L-sol/g-solid, which was 100 times greater than that of SiO2. The highest sorption of Cs on bentonite could be attributed to its smaller particle size (0.362 μm), compared to the SiO2 particle size (0.625 μm). Bentonite is natural clay and is generally used as a buffer material in geological disposal systems for high-level nuclear waste. The results of this research indicate that bentonite could be an effective absorbent for decontaminating low concentration Cs in radioactive wastewater.
{"title":"Sorption Studies of Cesium on Kunipia-F Bentonite and Silicon Dioxide","authors":"A. O-manee, Y. Enokida, Kayo Sawada","doi":"10.12982/cmjs.2022.093","DOIUrl":"https://doi.org/10.12982/cmjs.2022.093","url":null,"abstract":"Adsorption is one of the effective methods used for the removal of contaminants from radioactive wastewater. In this research, removal efficiency of Cs from the prepared low-concentration Cs solution (100 μg/L) was studied using two different adsorbents namely high purity Kunipia-F bentonite and Silicon dioxide (SiO2). After performing the adsorption tests, the Cs ions in liquid and solid phases were analyzed using the inductively coupled plasma mass spectrometry (ICP-MS) technique. The adsorption capacities of both materials were then compared. It was found that the Cs adsorption capacity of bentonite was higher than that of SiO2. The distribution coefficient of Cs in the bentonite was 1.0 L-sol/g-solid, which was 100 times greater than that of SiO2. The highest sorption of Cs on bentonite could be attributed to its smaller particle size (0.362 μm), compared to the SiO2 particle size (0.625 μm). Bentonite is natural clay and is generally used as a buffer material in geological disposal systems for high-level nuclear waste. The results of this research indicate that bentonite could be an effective absorbent for decontaminating low concentration Cs in radioactive wastewater.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"43 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85781025","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}
Sridhar Sivasubramaniam, T. Ramanathan, Nandhakumar Shanmugham, Karthick Sekar [
Friction stir welding (FSW) of aluminium alloy AA1100 is investigated in this work. The process parameters considered in the work includes; tool tilt angle, tool pin geometry, tool rotational speed and welding speed. The tensile strength, welding temperature and hardness are considered as the responses and selection of optimum welding process parameters for maximizing tensile strength, hardness and minimization of the welding temperature are demonstrated using Taguchi technique and Response surface methodology. Four levels for the welding process parameters are selected and Taguchi L16 orthogonal array is used to perform 16 experiments as designed by the design of experiments software. Aluminium alloys of AA1100 of thickness 2mm are chosen for this experimental work. The specially designed tool which is made up of high tool steel material is used in this Friction Stir Welding (FSW) process. Tool pins of various shapes are considered in this study. ANOVA analysis is carried out for every response and the S/N ratio for the strength, hardness and welding temperature are determined and the main effects plots for signal to noise ratio are plotted and discussed. The microstructure of the grain size infl uences the tensile strength of the weld joint. It is observed that the tool tilt angle provides very less infl uence in the determination of the tensile strength during FSW of AA1100 aluminium alloy. It is observed that by increasing the tool tilt angle, tool penetration into the specimen will increase and as a result it leads to an increase in the welding temperature.
{"title":"Investigation of Welding Process Parameters In Friction Stir Welding of AA1100 Alloy Using Taguchi Technique","authors":"Sridhar Sivasubramaniam, T. Ramanathan, Nandhakumar Shanmugham, Karthick Sekar [","doi":"10.12982/cmjs.2022.090","DOIUrl":"https://doi.org/10.12982/cmjs.2022.090","url":null,"abstract":"Friction stir welding (FSW) of aluminium alloy AA1100 is investigated in this work. The process parameters considered in the work includes; tool tilt angle, tool pin geometry, tool rotational speed and welding speed. The tensile strength, welding temperature and hardness are considered as the responses and selection of optimum welding process parameters for maximizing tensile strength, hardness and minimization of the welding temperature are demonstrated using Taguchi technique and Response surface methodology. Four levels for the welding process parameters are selected and Taguchi L16 orthogonal array is used to perform 16 experiments as designed by the design of experiments software. Aluminium alloys of AA1100 of thickness 2mm are chosen for this experimental work. The specially designed tool which is made up of high tool steel material is used in this Friction Stir Welding (FSW) process. Tool pins of various shapes are considered in this study. ANOVA analysis is carried out for every response and the S/N ratio for the strength, hardness and welding temperature are determined and the main effects plots for signal to noise ratio are plotted and discussed. The microstructure of the grain size infl uences the tensile strength of the weld joint. It is observed that the tool tilt angle provides very less infl uence in the determination of the tensile strength during FSW of AA1100 aluminium alloy. It is observed that by increasing the tool tilt angle, tool penetration into the specimen will increase and as a result it leads to an increase in the welding temperature.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"167 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76369136","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}
C. Kanchanomai, K. Nakano, D. Naphrom, K. Takizawa, Yating Xiong, Phonkrit Maniwara, S. Ohashi
Imaging and spectroscopy are non-destructive techniques for determining fruit qualities. The qualities of table grapes (Vitis vinifera) such as soluble solids content (SSC), pH, fi rmness and seedlessness are key parameters. This research was focused on comparison between imaging and spectroscopy in laboratory and fi eld. The results of Partial least squares regression (PLSR) showed that the best coeffi cient of determination (R2) for prediction (R2 pred) on SSC for laboratory was 0.8085, for fi eld was 0.8169, and for imaging was 0.7994. The best R2 pred on fi rmness for laboratory was 0.6925, for fi eld was 0.5737, and for imaging was 0.6216. The best R2 pred on pH for laboratory was 0.6820, for fi eld was 0.7101 and for imaging was 0.6494. Partial least squares discriminant analysis (PLS-DA) was analyzed the successful percentage of seedlessness classifi cation: 89.66%, 93.10% and 81.25% for spectroscopy in laboratory, fi eld and imaging, respectively. The results of SSC and seedlessness in fi eld are almost same effi cient as in laboratory. That means farmer can do spectroscopy on SSC and seedlessness anywhere and non-destructively. By the way, we can use both techniques as effi cient non-destructive techniques for determining these key parameters of table grape qualities.
{"title":"Experimental Study of Determining Technique for Table Grape Qualities using Visible Wavelength of Imaging and Spectroscopy","authors":"C. Kanchanomai, K. Nakano, D. Naphrom, K. Takizawa, Yating Xiong, Phonkrit Maniwara, S. Ohashi","doi":"10.12982/cmjs.2022.0085","DOIUrl":"https://doi.org/10.12982/cmjs.2022.0085","url":null,"abstract":"Imaging and spectroscopy are non-destructive techniques for determining fruit qualities. The qualities of table grapes (Vitis vinifera) such as soluble solids content (SSC), pH, fi rmness and seedlessness are key parameters. This research was focused on comparison between imaging and spectroscopy in laboratory and fi eld. The results of Partial least squares regression (PLSR) showed that the best coeffi cient of determination (R2) for prediction (R2 pred) on SSC for laboratory was 0.8085, for fi eld was 0.8169, and for imaging was 0.7994. The best R2 pred on fi rmness for laboratory was 0.6925, for fi eld was 0.5737, and for imaging was 0.6216. The best R2 pred on pH for laboratory was 0.6820, for fi eld was 0.7101 and for imaging was 0.6494. Partial least squares discriminant analysis (PLS-DA) was analyzed the successful percentage of seedlessness classifi cation: 89.66%, 93.10% and 81.25% for spectroscopy in laboratory, fi eld and imaging, respectively. The results of SSC and seedlessness in fi eld are almost same effi cient as in laboratory. That means farmer can do spectroscopy on SSC and seedlessness anywhere and non-destructively. By the way, we can use both techniques as effi cient non-destructive techniques for determining these key parameters of table grape qualities.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"139 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86548416","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}
Thammasorn Harnpadungkij, Warasinee Chaisangmongkon, P. Phunchongharn
Financial trading is one of the most popular problems for reinforcement learning in recent years. One of the important challenges is that investment is a multi-objective problem. That is, professional investors do not act solely on expected profi t but also carefully consider the potential risk of a given investment. To handle such a challenge, previous studies have explored various kinds of risk-sensitive rewards, for example, the Sharpe ratio as computed by a fi xed length of previous returns. This work proposes a new approach to deal with the profi t-to-risk tradeoff by applying distributional reinforcement learning to build a risk awareness policy instead of a simple risk-based reward function. Our new policy, termed C51-Sharpe, is to select the action based on the Sharpe ratio computed from the probability mass function of the return. This produces a signifi cantly higher Sharpe ratio and lower maximum drawdown without sacrifi cing profi t compared to the C51algorithm utilizing a purely profi t-based policy. Moreover, it can outperform other benchmarks, such as a Deep Q-Network (DQN) with a Sharpe ratio reward function. Besides the policy, we also studied the effect of using double networks and the choice of exploration strategies with our approach to identify the optimal training confi guration. We fi nd that the epsilon-greedy policy is the most suitable exploration for C51-Sharpe and that the use of double network has no signifi cant impact on performance. Our study provides statistical evidence of the effi ciency in risk-sensitive policy implemented by using distributional reinforcement algorithms along with an optimized training process.
{"title":"Risk-Sensitive Portfolio Management by Using C51 Algorithm","authors":"Thammasorn Harnpadungkij, Warasinee Chaisangmongkon, P. Phunchongharn","doi":"10.12982/cmjs.2022.094","DOIUrl":"https://doi.org/10.12982/cmjs.2022.094","url":null,"abstract":"Financial trading is one of the most popular problems for reinforcement learning in recent years. One of the important challenges is that investment is a multi-objective problem. That is, professional investors do not act solely on expected profi t but also carefully consider the potential risk of a given investment. To handle such a challenge, previous studies have explored various kinds of risk-sensitive rewards, for example, the Sharpe ratio as computed by a fi xed length of previous returns. This work proposes a new approach to deal with the profi t-to-risk tradeoff by applying distributional reinforcement learning to build a risk awareness policy instead of a simple risk-based reward function. Our new policy, termed C51-Sharpe, is to select the action based on the Sharpe ratio computed from the probability mass function of the return. This produces a signifi cantly higher Sharpe ratio and lower maximum drawdown without sacrifi cing profi t compared to the C51algorithm utilizing a purely profi t-based policy. Moreover, it can outperform other benchmarks, such as a Deep Q-Network (DQN) with a Sharpe ratio reward function. Besides the policy, we also studied the effect of using double networks and the choice of exploration strategies with our approach to identify the optimal training confi guration. We fi nd that the epsilon-greedy policy is the most suitable exploration for C51-Sharpe and that the use of double network has no signifi cant impact on performance. Our study provides statistical evidence of the effi ciency in risk-sensitive policy implemented by using distributional reinforcement algorithms along with an optimized training process.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"13 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89257082","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}
T. Ramanathan, Kannan Sithan, Subbarayan Ramanathan, Prakash Ramasamy
The aim of the research is to optimize the drilling process parameters while drilling of glass fi bre reinforced composites using solid carbide drill by integrating response surface methodology and Taguchi technique. Drilling process parameters includes cutting speed, Feed rate and point angle with three levels. The responses measured against these drilling parameters are; material removal rate, surface roughness, oversize and delamination factor. The ANOVA analysis is carried out for the responses and the regression equations are developed and checked for its adequacy. The R-squared value for material removal rate is found to be 99.40%, for surface roughness is found to be 96.81% , for over size is found to be 98.2% and for delamination factor is found to be 96.46% and these values are acceptable. Also Taguchi grey relational grade analysis is carried and the grey relational coeffi cients are determined and they are ranked. The optimal parameter is fi nally determined using the grey relational analysis and the experiments are validated.
{"title":"Parametric Optimization In Drilling Process Parameters For Machining Of Glass Fibre Reinforced Composites Using Grey Relational Grade Analysis","authors":"T. Ramanathan, Kannan Sithan, Subbarayan Ramanathan, Prakash Ramasamy","doi":"10.12982/cmjs.2022.091","DOIUrl":"https://doi.org/10.12982/cmjs.2022.091","url":null,"abstract":"The aim of the research is to optimize the drilling process parameters while drilling of glass fi bre reinforced composites using solid carbide drill by integrating response surface methodology and Taguchi technique. Drilling process parameters includes cutting speed, Feed rate and point angle with three levels. The responses measured against these drilling parameters are; material removal rate, surface roughness, oversize and delamination factor. The ANOVA analysis is carried out for the responses and the regression equations are developed and checked for its adequacy. The R-squared value for material removal rate is found to be 99.40%, for surface roughness is found to be 96.81% , for over size is found to be 98.2% and for delamination factor is found to be 96.46% and these values are acceptable. Also Taguchi grey relational grade analysis is carried and the grey relational coeffi cients are determined and they are ranked. The optimal parameter is fi nally determined using the grey relational analysis and the experiments are validated.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"64 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75895564","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}
S. Issarapanacheewin, K. Yubonmhat, T. Akharawutchayanon, U. Lamdab, W. Silpradit, Wilasinee Kingkam, W. Katekaew, N. Prasertchiewchan
This paper reveals an appropriate ingredient to operating the hazardous and radioactive electric arc furnace dust (EAFD) from the steel production factory using the cement immobilization technique. The cement specimens were prepared by mixing tap water with the binders (i.e., ordinary Portland cement: OPC, and the EAFD) at the different EAFD replacement of 0%, 15%, 25%, 35%, 40%, 45%, and 50% by weight. The water-to-binders ratio was fi xed at 0.40. The compressive strength test on the fabricated samples was performed at two different curing times of 14 and 28 days. It was found that the highest compressive strength of the samples can be obtained when the EAFD loading was 25%. However, the compressive strength criteria for the cement waste form, the use of the ingredient with the higher EAFD loading (35% EAFD with 28-day curing time) for the immobilization is favorable while meets the criteria. The phase composition and microstructure morphology of all samples were analyzed by X-ray diffraction (XRD), X-ray fl uorescence (XRF) and scanning electron microscopy (SEM-EDS).
{"title":"Cement Immobilization of Hazardous and Radioactive Electric Arc Furnace Dust","authors":"S. Issarapanacheewin, K. Yubonmhat, T. Akharawutchayanon, U. Lamdab, W. Silpradit, Wilasinee Kingkam, W. Katekaew, N. Prasertchiewchan","doi":"10.12982/cmjs.2022.092","DOIUrl":"https://doi.org/10.12982/cmjs.2022.092","url":null,"abstract":"This paper reveals an appropriate ingredient to operating the hazardous and radioactive electric arc furnace dust (EAFD) from the steel production factory using the cement immobilization technique. The cement specimens were prepared by mixing tap water with the binders (i.e., ordinary Portland cement: OPC, and the EAFD) at the different EAFD replacement of 0%, 15%, 25%, 35%, 40%, 45%, and 50% by weight. The water-to-binders ratio was fi xed at 0.40. The compressive strength test on the fabricated samples was performed at two different curing times of 14 and 28 days. It was found that the highest compressive strength of the samples can be obtained when the EAFD loading was 25%. However, the compressive strength criteria for the cement waste form, the use of the ingredient with the higher EAFD loading (35% EAFD with 28-day curing time) for the immobilization is favorable while meets the criteria. The phase composition and microstructure morphology of all samples were analyzed by X-ray diffraction (XRD), X-ray fl uorescence (XRF) and scanning electron microscopy (SEM-EDS).","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"15 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75353074","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}
S. Tang, Komsit Wisitrassameewong, Feng-Ming Yu, Lei Ye, Lin Gao, Luo Xia
Lactarius pseudoaurantiozonatus, belonging to Lactarius subg. Lactarius, is proposed as a new species from Anhui Province, China based on detailed morphology and molecular analyses (nrITS) region. Lactarius pseudoaurantiozonatus, is characterized by a pale yellow to orange-yellow, zonate pileus, subglobose to broadly ellipsoid basidiospores which measure 5.5–7.9 × 4.5–6.5 μm, white latex which quickly turns olive-yellow, indistinct odor and burning-acrid taste.
{"title":"Lactarius pseudoaurantiozonatus (Russulales), A New Species of Lactarius subgenus Lactarius from China","authors":"S. Tang, Komsit Wisitrassameewong, Feng-Ming Yu, Lei Ye, Lin Gao, Luo Xia","doi":"10.12982/cmjs.2022.080","DOIUrl":"https://doi.org/10.12982/cmjs.2022.080","url":null,"abstract":"Lactarius pseudoaurantiozonatus, belonging to Lactarius subg. Lactarius, is proposed as a new species from Anhui Province, China based on detailed morphology and molecular analyses (nrITS) region. Lactarius pseudoaurantiozonatus, is characterized by a pale yellow to orange-yellow, zonate pileus, subglobose to broadly ellipsoid basidiospores which measure 5.5–7.9 × 4.5–6.5 μm, white latex which quickly turns olive-yellow, indistinct odor and burning-acrid taste.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"98 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89656568","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}
Green mesoporous SBA-15 was synthesized by using corn stack ash (CSA), a new renewable silica source, as the main raw material. 80 wt% sodium silicate solution from CSA was mixed with a tetraethyl orthosilicate (TEOS) solution, and fi nally after a hydrothermal process, mesoporous SBA- 15 was obtained. Subsequently, iron metal was incorporated into the prepared SBA-15 and used as an effi cient Fenton catalyst for degradation of indigo carmine (IC) under various conditions. Effects of various parameters of the Fenton process: initial pH, H2O2 concentration, Fe content, and reaction temperature were studied. It was observed that Fe2O3/80CSBA demonstrated good activity not only for a wide range of pH (both of acidic and basic conditions), but also at room temperature. Using the optimum condition, 98% of IC removal can be reached within 10 min. Moreover, the catalyst exhibited long-term stability and strong resistance to leaching of Fe species, while incorporating metal only 0.5 wt% of metal.
{"title":"Green SBA-15 as a Fenton Catalytic Support for Efficient Degradation of Indigo Carmine","authors":"Pornpan Namkhang, Paisan Kongkachuichay","doi":"10.12982/cmjs.2022.084","DOIUrl":"https://doi.org/10.12982/cmjs.2022.084","url":null,"abstract":"Green mesoporous SBA-15 was synthesized by using corn stack ash (CSA), a new renewable silica source, as the main raw material. 80 wt% sodium silicate solution from CSA was mixed with a tetraethyl orthosilicate (TEOS) solution, and fi nally after a hydrothermal process, mesoporous SBA- 15 was obtained. Subsequently, iron metal was incorporated into the prepared SBA-15 and used as an effi cient Fenton catalyst for degradation of indigo carmine (IC) under various conditions. Effects of various parameters of the Fenton process: initial pH, H2O2 concentration, Fe content, and reaction temperature were studied. It was observed that Fe2O3/80CSBA demonstrated good activity not only for a wide range of pH (both of acidic and basic conditions), but also at room temperature. Using the optimum condition, 98% of IC removal can be reached within 10 min. Moreover, the catalyst exhibited long-term stability and strong resistance to leaching of Fe species, while incorporating metal only 0.5 wt% of metal.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"15 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73839484","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}
Narongdetch Boothrawong, L. Tawee, Suwanan Thammarong, P. Jaita, D. Sweatman, G. Rujijanagul, T. Tunkasiri
Due to the toxic of lead content ceramics, many free piezoelectric ceramics have received much attention. To obtain high piezoelectric properties for such free piezoelectric ceramics, poling conditions are often referred. In the present work, effects of the poling electric field on the many properties of Sm doped BCZT ceramic were investigated. The samples were fabricated using a solid-state reaction technique. The XRD analysis indicated that the sample contained a mixture of phases of rhombohedral, tetragonal, and orthorhombic phases with high purity, dense, and large average grain size. A transformation from the symmetric S-E loop for the unpoled sample to an asymmetry loop for the poled sample was observed, while a slight change in the P-E shape was noted. The poling electric field showed a small effect on ɛr and kp values. However, it had large effects on HS, d33, g33, and FoM values. The low HS (9.2%), but high d33 (562 pC/N), g33 (15.55×10−3 Vm/N) and FoM (20.65 pm2/N) values indicated that this ceramic system has potential for piezoelectric and energy harvesting applications.
{"title":"Poling Effects of Piezoelectric Properties of Modified BCZT Ceramics with High Piezoelectric Performance","authors":"Narongdetch Boothrawong, L. Tawee, Suwanan Thammarong, P. Jaita, D. Sweatman, G. Rujijanagul, T. Tunkasiri","doi":"10.12982/cmjs.2022.087","DOIUrl":"https://doi.org/10.12982/cmjs.2022.087","url":null,"abstract":"Due to the toxic of lead content ceramics, many free piezoelectric ceramics have received much attention. To obtain high piezoelectric properties for such free piezoelectric ceramics, poling conditions are often referred. In the present work, effects of the poling electric field on the many properties of Sm doped BCZT ceramic were investigated. The samples were fabricated using a solid-state reaction technique. The XRD analysis indicated that the sample contained a mixture of phases of rhombohedral, tetragonal, and orthorhombic phases with high purity, dense, and large average grain size. A transformation from the symmetric S-E loop for the unpoled sample to an asymmetry loop for the poled sample was observed, while a slight change in the P-E shape was noted. The poling electric field showed a small effect on ɛr and kp values. However, it had large effects on HS, d33, g33, and FoM values. The low HS (9.2%), but high d33 (562 pC/N), g33 (15.55×10−3 Vm/N) and FoM (20.65 pm2/N) values indicated that this ceramic system has potential for piezoelectric and energy harvesting applications.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"68 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72660821","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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