Chiang Mai Journal of Science最新文献_第10页

Third-type of Strain Aging of GH4720Li Over a Wide Range of Temperatures and Strain Rates GH4720Li在大温度和应变速率下的第三类应变时效

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-09-30 DOI: 10.12982/cmjs.2022.088

Jie Chen, Zhijun Wang, H. Zhang, Qingxiang Yang, Hongtao Zhang, Ruo-Xun Zhai

引用次数: 0

Sorption Studies of Cesium on Kunipia-F Bentonite and Silicon Dioxide Kunipia-F膨润土和二氧化硅对铯的吸附研究

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-09-30 DOI: 10.12982/cmjs.2022.093

A. O-manee, Y. Enokida, Kayo Sawada

{"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}

引用次数: 0

Investigation of Welding Process Parameters In Friction Stir Welding of AA1100 Alloy Using Taguchi Technique 田口法AA1100合金搅拌摩擦焊接工艺参数研究

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-09-30 DOI: 10.12982/cmjs.2022.090

Sridhar Sivasubramaniam, T. Ramanathan, Nandhakumar Shanmugham, Karthick Sekar [

{"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}

引用次数: 1

Experimental Study of Determining Technique for Table Grape Qualities using Visible Wavelength of Imaging and Spectroscopy 可见波长成像光谱法测定鲜食葡萄品质的实验研究

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-09-30 DOI: 10.12982/cmjs.2022.0085

C. Kanchanomai, K. Nakano, D. Naphrom, K. Takizawa, Yating Xiong, Phonkrit Maniwara, S. Ohashi

{"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}

引用次数: 0

Risk-Sensitive Portfolio Management by Using C51 Algorithm 基于C51算法的风险敏感投资组合管理

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-09-30 DOI: 10.12982/cmjs.2022.094

Thammasorn Harnpadungkij, Warasinee Chaisangmongkon, P. Phunchongharn

{"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}

引用次数: 0

Parametric Optimization In Drilling Process Parameters For Machining Of Glass Fibre Reinforced Composites Using Grey Relational Grade Analysis 基于灰色关联度分析的玻璃纤维增强复合材料钻孔工艺参数优化

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-09-30 DOI: 10.12982/cmjs.2022.091

T. Ramanathan, Kannan Sithan, Subbarayan Ramanathan, Prakash Ramasamy

引用次数: 1

Cement Immobilization of Hazardous and Radioactive Electric Arc Furnace Dust 有害放射性电弧炉粉尘的水泥固定化

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-09-30 DOI: 10.12982/cmjs.2022.092

S. Issarapanacheewin, K. Yubonmhat, T. Akharawutchayanon, U. Lamdab, W. Silpradit, Wilasinee Kingkam, W. Katekaew, N. Prasertchiewchan

{"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}

引用次数: 2

Lactarius pseudoaurantiozonatus (Russulales), A New Species of Lactarius subgenus Lactarius from China 文章标题中国乳牛亚属一新种——伪aurantiozonatus (Russulales

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-09-30 DOI: 10.12982/cmjs.2022.080

S. Tang, Komsit Wisitrassameewong, Feng-Ming Yu, Lei Ye, Lin Gao, Luo Xia

引用次数: 0

Green SBA-15 as a Fenton Catalytic Support for Efficient Degradation of Indigo Carmine 绿色SBA-15 Fenton催化剂高效降解靛蓝胭脂红

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-09-30 DOI: 10.12982/cmjs.2022.084

Pornpan Namkhang, Paisan Kongkachuichay

引用次数: 0

Poling Effects of Piezoelectric Properties of Modified BCZT Ceramics with High Piezoelectric Performance 高压电性能改性BCZT陶瓷的极化效应

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-09-30 DOI: 10.12982/cmjs.2022.087

Narongdetch Boothrawong, L. Tawee, Suwanan Thammarong, P. Jaita, D. Sweatman, G. Rujijanagul, T. Tunkasiri

{"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}

引用次数: 0