Communications in Science and Technology最新文献_第8页

EEG band power analysis corresponding to salivary amylase activity during stressful computer gameplay 在紧张的电脑游戏过程中唾液淀粉酶活性对应的脑电图带功率分析

Communications in Science and Technology Pub Date : 2022-07-31 DOI: 10.21924/cst.7.1.2022.676

Alvin Sahroni, Faizal Mahananto, H. Zakaria, Hendra Setiawan

引用次数: 0

Studies on thermal and mechanical behavior of nano TiO2 - epoxy polymer composite 纳米TiO2-环氧聚合物复合材料的热力学性能研究

Communications in Science and Technology Pub Date : 2022-07-31 DOI: 10.21924/cst.7.1.2022.667

J. Sagar, G. Madhu, J. Koteswararao, P. Dixit

引用次数: 3

A review of measurement of electromagnetic emission in electronic product: Techniques and challenges 电子产品电磁发射测量技术综述与挑战

Communications in Science and Technology Pub Date : 2022-07-31 DOI: 10.21924/cst.7.1.2022.727

T. Yuwono, M. Baharuddin, N. Misran, M. Ismail, M. F. Mansor

{"title":"A review of measurement of electromagnetic emission in electronic product: Techniques and challenges","authors":"T. Yuwono, M. Baharuddin, N. Misran, M. Ismail, M. F. Mansor","doi":"10.21924/cst.7.1.2022.727","DOIUrl":"https://doi.org/10.21924/cst.7.1.2022.727","url":null,"abstract":"Nowadays, electronic products are being used extensively in many fields and applications. The dense population of electronic devices in human life has become a challenge for microwave engineers to ensure that their products can meet the Electromagnetic Compatibility (EMC) standards. Complex electronic products with smaller sizes and denser components will be a challenge for compliance with EMC standards. In addition, the occurrence of non-stationary emission at certain operating modes becomes a challenge for analysis. Error in analyzing EM emissions will make the products unable to meet the requirements of EMC standards; hence, they will be prohibited to be marketed. Currently, there are two methods of emission analysis, i.e. by measurement and modeling or computation. There are some problems, however, in the analysis of EM emissions regarding the area of test, complexity, DUT positioning error, installation cost, and time consumption. In this paper, the analysis techniques for EM emissions including Open Area Test Site (OATS), Anechoic chamber, Transverse Electromagnetics TEM Cell, Compact Antenna Test Range (CATR) and near field scanning are reviewed comprehensively. This survey covered EMC standards, principles of EM emission measurement techniques, advantages and disadvantages of EM emission measurement techniques, studies and applications of each technique, recommendations for which technique to be used, and challenges for future research in EM emission measurement. The final section of this paper discusses the challenges for near-field measurements related to the non-stationary emissions phenomenon. This papers also presents the challenges of how to detect and characterize them.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42197774","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}

引用次数: 0

Adsorption studies of KOH-modified hydrochar derived from sugarcane bagasse for dye removal: Kinetic, isotherm, and thermodynamic study 甘蔗渣氢氧化钾改性烃类对染料去除的吸附研究:动力学、等温线和热力学研究

Communications in Science and Technology Pub Date : 2022-07-31 DOI: 10.21924/cst.7.1.2022.669

D. Lestari, A. T. Yuliansyah, A. Budiman

{"title":"Adsorption studies of KOH-modified hydrochar derived from sugarcane bagasse for dye removal: Kinetic, isotherm, and thermodynamic study","authors":"D. Lestari, A. T. Yuliansyah, A. Budiman","doi":"10.21924/cst.7.1.2022.669","DOIUrl":"https://doi.org/10.21924/cst.7.1.2022.669","url":null,"abstract":"Toxicity of methylene blue (MB) in water bodies has a negative effect on environment and living organisms. The presence of MB in water could last longer in view of the non-biodegradable characteristic. In this study, hydrochar was used as adsorbent to remove MB from aqueous solution. Hydrochar derived from bagasse was successfully prepared by hydrothermal carbonization treatment at temperature of 270oC, and pressure of 10 Bar for 30 minutes. For enhancing the adsorption ability, hydrochar was activated by adding KOH that was able to increase the percent removal by ~11%. The hydrochar was characterized using FTIR before and after adsorption. The results showed that the dominant functional groups of hydrochar included O-H, C=O, -O- and aromatic compounds. Whereas, the functional group of azo groups such as N-H and N=N appeared after adsorption. The maximum adsorption capacity (Qmax) was 5.1204 mg/g, while the adsorption isotherm of MB onto hydrochar followed the Langmuir and Freundlich model. The adsorption mechanism belongs to chemical adsorption, and the rate of diffusion can be neglected because the adsorption kinetics fitted well with pseudo-second order and the value of k2 > kdif > k1. Thermodynamic studies indicated that the adsorption process is classified as endothermic and reversible at room temperature. The results showed that hydrochar could be the alternative adsorbent for removing MB in wastewater. In addition, sugarcane bagasse has a great potential as feedstock of hydrochar.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46725725","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}

引用次数: 6

Mg/Cr-(COO)22- layered double hydroxide for malachite green removal Mg/Cr-（COO）22层双氢氧化物去除孔雀石绿的研究

Communications in Science and Technology Pub Date : 2022-07-31 DOI: 10.21924/cst.7.1.2022.851

N. Palapa, A. Badri, Mardiyanto, R. Mohadi, T. Taher, A. Lesbani

引用次数: 1

Spontaneous gaze interaction based on smooth pursuit eye movement using difference gaze pattern method 基于差分注视模式法的平滑追求眼动的自发注视交互

Communications in Science and Technology Pub Date : 2022-07-31 DOI: 10.21924/cst.7.1.2022.739

Suatmi Murnani, N. A. Setiawan, S. Wibirama

{"title":"Spontaneous gaze interaction based on smooth pursuit eye movement using difference gaze pattern method","authors":"Suatmi Murnani, N. A. Setiawan, S. Wibirama","doi":"10.21924/cst.7.1.2022.739","DOIUrl":"https://doi.org/10.21924/cst.7.1.2022.739","url":null,"abstract":"Human gaze is a promising input modality for being able to be used as natural user interface in touchless technology during Covid-19 pandemic. Spontaneous gaze interaction is required to allow participants to directly interact with an application without any prior eye tracking calibration. Smooth pursuit eye movement is commonly used in this kind of spontaneous gaze-based interaction. Many studies have been focused on various object selection techniques in smooth pursuit-based gaze interaction; however, challenges in spatial accuracy and implementation complexity have not been resolved yet. To address these problems, we then proposed an approach using difference patterns between gaze and dynamic objects' trajectories for object selection named Difference Gaze Pattern method (DGP). Based on the experimental results, our proposed method yielded the best object selection accuracy of and success time of ms. The experimental results also showed the robustness of object selection using difference patterns to spatial accuracy and it was relatively simpler to be implemented. The results also suggested that our proposed method can contribute to spontaneous gaze interaction.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47600257","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}

引用次数: 1

Dimensional analysis of partial discharge initiated by a metallic particle adhering to the spacer surface in a gas-insulated system 气体绝缘系统中金属颗粒粘附在垫片表面引发局部放电的尺寸分析

Communications in Science and Technology Pub Date : 2021-12-31 DOI: 10.21924/cst.6.2.2021.556

F. N. Budiman, A. Rushdi

{"title":"Dimensional analysis of partial discharge initiated by a metallic particle adhering to the spacer surface in a gas-insulated system","authors":"F. N. Budiman, A. Rushdi","doi":"10.21924/cst.6.2.2021.556","DOIUrl":"https://doi.org/10.21924/cst.6.2.2021.556","url":null,"abstract":"Partial discharges (PDs) constitute important phenomena in a Gas-Insulated System (GIS) that warrant recognition (and, subsequently, mitigation) as they are obvious symptoms of system degradation. This paper proposes the application of dimensional analysis, based on Buckingham pi theorem, for characterizing PDs provoked by the presence of metallic particles adhering to the spacer surface in a GIS employing SF6 (Sulphur hexafluoride). The ultimate goal of the analysis is to formulate the relationships that express three PD indicator quantities, namely current, charge, and energy, in terms of six independent quantities that collectively influence these indicators. These six quantities (henceforth referred to as the influencing, determining or affecting variables) include the level of applied voltage, the SF6 pressure, the length and position of the particle on the spacer, the duration of voltage application, and the gap between electrodes. To compute the pertinent dimensionless products, we implement three computational methods based on matrix operations. These three methods produce exactly the same dimensionless products, which are subsequently used for constructing the models depicting the relationships between each of the three PD dependent quantities and the common six determining variables. The models derived provide partial quantitative information and facilitate qualitative reasoning about the considered phenomenon.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42240844","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}

引用次数: 1

Corncob residue as heterogeneous acid catalyst for green synthesis of biodiesel: A short review 玉米芯渣作为绿色合成生物柴油的多相酸性催化剂的研究进展

Communications in Science and Technology Pub Date : 2021-12-31 DOI: 10.21924/cst.6.2.2021.460

P. Mardina, H. Wijayanti, A. Tuhuloula, Erita Hijriyati, Sarifah

引用次数: 1

The influences of lime and irrigation water on arsenic accumulation of rice, maize and mungbean in the nethouse condition 石灰和灌溉水对水稻、玉米和绿豆地下砷积累的影响

Communications in Science and Technology Pub Date : 2021-12-31 DOI: 10.21924/cst.6.2.2021.515

N. Chuong

{"title":"The influences of lime and irrigation water on arsenic accumulation of rice, maize and mungbean in the nethouse condition","authors":"N. Chuong","doi":"10.21924/cst.6.2.2021.515","DOIUrl":"https://doi.org/10.21924/cst.6.2.2021.515","url":null,"abstract":"This research found the great hold of liming, soils and irrigation water on the arsenic (As) accumulation of rice, maize and mung bean in the nethouse research. Two greenhouse experiments had various plant types of rice, maize and mung bean with two soils inside and outside the dyke, two irrigated waters of 0.0 and 200 ?g As/L and three different lime ratios (0, 7.0 and 9.0 tons CaO/ha). The whole treatments were twenty one (12 treatments of experiment 1 and 9 of experiment 2) with 4 repetitions. The results of this study showed that the lime application raised both soil pH and crop yield. The arsenic (As) absorption of plant bodies in stems and seeds inside the dyke increased from 67.8 to 68.3% higher than those outside the dyke, respectively. The arsenic contents of stems and seeds with the treatments of 200 ?g As/L irrigation water were higher from 81.5 to 89.4% than that of non As irrigation water, respectively. The lime supplementation of 7.0 and 9.0 tons CaO per ha reduced the As accumulation of stems and seeds of rice, maize and mung bean was lower than the one without lime supplement from 38.6 (stems) and 54.5 (seeds). Mung bean absorbed the highest As, followed by rice and maize with the lowest As value. However, the lime supplementation of 9.0 tons CaO/ha had so high soil pH of soil that restricted the growth and yield of crops. More different lime concentrations need to search for more new details and new discovery of positive effects of this research.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49442705","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}

引用次数: 0

Volume change in compacted claystone-bentonite mixtures as affected by the swamp acidic water 沼泽酸性水对粘土-膨润土混合物压实体积变化的影响

Communications in Science and Technology Pub Date : 2021-12-31 DOI: 10.21924/cst.6.2.2021.540

Y. Arifin, M. Arsyad, Jeane Monica, S. Agus

引用次数: 1