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PHYTOCHEMICAL COMPONENTS, PROXIMATE ANALYSIS, AND ANTIMICROBIAL PROPERTIES OF FERMENTED AND NON-FERMENTED SAMPLES OF Zingiber officinale 刺五加发酵样品和非发酵样品的物理化学成分、近似分析和抗微生物特性
IF 0.2 Q4 Engineering Pub Date : 2023-12-13 DOI: 10.55766/sujst-2023-04-e0928
M. Falana, Morufat Adewale, Abdulsamad Adeshina, Maryam Sadiq, Quadri Olaide Nurudeen
The desirability of fermented foods may be attributed to their benefits. This study investigated the pH, in vitro antimicrobial assays including Minimum Inhibition Concentration (MIC), Minimum Fungicidal Concentration (MFC), and disc diffusion assay of fermented and non-fermented samples of Zingiber officinale against Candida albicans, Staphylococcus aureus, and Escherichia coli. But phytochemical screening, proximate compositions, and High-Performance Liquid Chromatography (HPLC) were carried out only on the non-fermented sample.  The pH decreased steadily throughout while the MIC ranged between 12.5 – 50.0 mg/mL. The MIC of the non-fermented sample ranged between 25-50.0 mg/Ml. The highest zones of inhibition obtained were between 8.0 mm- 16.0 mm at 100 mg/mL, 8.0 mm- 14.00 mm at 50.0 mg/mL, and 2.00-8.4 mm at 25 mg/mL. Comparatively, the zones were higher (6.8-8.4 mm) for the fermented than for the non-fermented sample (1.8-4.0 mm) and higher against S. aureus (4-16.0 mm) than E. coli (2.0 -12.0 mm) and C. albicans (2.0-6.0 mm). The fermented sample contained alkaloids, anthraquinones, flavonoids, phlobatannins, saponins, tannins, and terpenoids, while alkaloids, flavonoids, glycosides, saponins, steroids, tannins, and terpenoids were in the non-fermented sample. The fermented sample contained 87.31% moisture, 1.24% ash, 0.29% fat, 9.73% carbohydrate, 0.24% fiber, and 1.48% protein, while the non-fermented sample contained 83.10% moisture, 1.02% ash, 0.21% fat, 14.46% carbohydrate, 0.18% fiber, and 1.24% protein. HPLC revealed Alpha farnesene (51.77), zingiberene (11.30), zingerone (14.53), 6-gingerol (12.44), and quercetin (35.21) in the fermented sample. Thus, the fermented sample of Zingiber officinale is a suitable candidate for the promotion of human health.
发酵食品之所以受人青睐,可能是因为它们有很多好处。本研究调查了酸碱度、体外抗菌检测(包括最低抑菌浓度(MIC)、最低杀菌浓度(MFC))以及发酵和非发酵样品对白色念珠菌、金黄色葡萄球菌和大肠杆菌的盘扩散检测。但植物化学成分筛选、近似成分和高效液相色谱法(HPLC)仅在非发酵样品中进行。 pH 值在整个过程中稳步下降,而 MIC 值在 12.5 - 50.0 mg/mL 之间。非发酵样品的 MIC 在 25-50.0 mg/Ml 之间。在 100 毫克/毫升的浓度下,最高抑菌区为 8.0 毫米至 16.0 毫米;在 50.0 毫克/毫升的浓度下,最高抑菌区为 8.0 毫米至 14.00 毫米;在 25 毫克/毫升的浓度下,最高抑菌区为 2.00 至 8.4 毫米。相比之下,发酵样品的作用区(6.8-8.4 毫米)高于未发酵样品的作用区(1.8-4.0 毫米),对金黄色葡萄球菌的作用区(4-16.0 毫米)高于对大肠杆菌的作用区(2.0-12.0 毫米)和对白僵菌的作用区(2.0-6.0 毫米)。发酵样品中含有生物碱、蒽醌类、黄酮类、相思豆苷、皂苷、单宁和萜类化合物,而非发酵样品中含有生物碱、黄酮类、苷类、皂苷、甾体、单宁和萜类化合物。发酵样品含水分 87.31%、灰分 1.24%、脂肪 0.29%、碳水化合物 9.73%、纤维 0.24% 和蛋白质 1.48%,而非发酵样品含水分 83.10%、灰分 1.02%、脂肪 0.21%、碳水化合物 14.46%、纤维 0.18% 和蛋白质 1.24%。高效液相色谱法显示,发酵样品中含有阿尔法芳香烯(51.77)、紫苏烯(11.30)、姜酮(14.53)、6-姜酚(12.44)和槲皮素(35.21)。因此,姜科植物发酵样品是促进人类健康的合适候选物质。
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引用次数: 0
THE APPLICATION OF ANALYSIS OF VARIANCE TO DIFFERENT YTTRIUM BARIUM COPPER OXIDE SUPERCONDUCTING TRANSITION TEMPERATURE MODELING 方差分析在不同钇钡铜氧化物超导转变温度建模中的应用
IF 0.2 Q4 Engineering Pub Date : 2023-12-13 DOI: 10.55766/sujst-2023-05-e02267
A. Maksuwan, Arpapong Changjan, P. Pramuanl
Extensive research has been conducted on a modeling approach that contributes to predicting the critical temperature of Yttrium barium copper oxide (YBCO) materials. Statistical significance of differences in modeling approaches requires studies that can reliably distinguish between systematic approach effects and errors resulting from modeling approach variation. In this work, we introduce analysis of variance (ANOVA) to assess the statistical significance of differences in modeling approach variation. Comparisons of obtained results with YBCO modeling approach variation data of support vector machine (SVM) and linear regression with natural logarithm transformation (LRNLT) were presented.
对有助于预测氧化钇钡铜(YBCO)材料临界温度的建模方法进行了广泛的研究。建模方法差异的统计意义要求研究能够可靠地区分系统方法效应和建模方法差异导致的误差。在这项工作中,我们引入了方差分析 (ANOVA) 来评估建模方法差异的统计意义。我们将获得的结果与支持向量机(SVM)和带自然对数转换的线性回归(LRNLT)的 YBCO 建模方法变化数据进行了比较。
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引用次数: 0
MECHANICAL PROPERTIES OF GRAPHENE NANOPLATELETS COMPOSITE RESIN FABRICATED BY 3D PRINTING TECHNIQUE 利用 3D 打印技术制造的石墨烯纳米片复合树脂的力学性能
IF 0.2 Q4 Engineering Pub Date : 2023-12-13 DOI: 10.55766/sujst-2023-05-e03020
Chanwit Pa-art, W. Nuansing
Vat photopolymerization 3D printing, including LCD 3D printing, is a versatile method for the fabrication of complex structures with numerous applications. The aim of this study was to investigate the potential of graphene nanoplatelets (GNP) as an additive for improving the mechanical properties of carbon-filled composite resin for LCD 3D printing. Tensile testing was conducted on the 3D-printed samples using the ASTM D638 type V standard model. The results indicated that adding 0.1% w/w GNP with 20 sec of exposure time increased the elastic modulus of the specimen from 7.31±1.02 MPa to 9.38±0.37 MPa for x-orientation (horizontal) and from 7.62±0.93 MPa to 9.58±0.61 MPa for y-orientation (vertical). Furthermore, the maximum tensile strength increased from 3.87±1.13 MPa to 5.28±0.73 MPa for y-orientation and from 4.06±0.92 MPa to 5.49±0.49 MPa for x-orientation. These results demonstrate the efficacy of GNP as an effective additive for enhancing the mechanical properties of carbon-based composite resin in LCD 3D printing.
大桶光聚合三维打印(包括液晶三维打印)是一种制造复杂结构的多功能方法,应用广泛。本研究旨在探究石墨烯纳米片(GNP)作为添加剂改善用于 LCD 3D 打印的碳填充复合树脂机械性能的潜力。采用 ASTM D638 V 型标准模型对 3D 打印样品进行了拉伸测试。结果表明,添加 0.1% w/w GNP 并暴露 20 秒后,试样在 x 方向(水平)的弹性模量从 7.31±1.02 兆帕增加到 9.38±0.37 兆帕,在 y 方向(垂直)的弹性模量从 7.62±0.93 兆帕增加到 9.58±0.61 兆帕。此外,y 方向的最大拉伸强度从 3.87±1.13 兆帕增至 5.28±0.73 兆帕,x 方向的最大拉伸强度从 4.06±0.92 兆帕增至 5.49±0.49 兆帕。这些结果表明,GNP 是一种有效的添加剂,可提高 LCD 3D 打印中碳基复合树脂的机械性能。
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引用次数: 0
EFFECTS OF COMBINATIONS OF LIMESTONE POWDER AND METAKAOLIN ON MORTAR COMPRESSIVE STRENGTH DEVELOPMENT 石灰石粉和偏高岭土的组合对砂浆抗压强度发展的影响
IF 0.2 Q4 Engineering Pub Date : 2023-12-13 DOI: 10.55766/sujst-2023-05-e02979
Thwet Thwet Win, Thanyarat Buasiri, W. Pansuk, L. Prasittisopin
Cement production is a major contributor to carbon dioxide (CO2) emissions, and concrete is one of the most widely used building materials in the world. To reduce CO2 emissions from cement, supplementary cementing materials have been widely introduced in mortar and concrete mixtures. This research will explore the mechanism that determines the development of compressive strength in mortar made with partly substituted cement and a mixture of limestone powder and laboratory-quenching heat-treated kaolinite clay (also called metakaolin). Metakaolin is rich in Southeast Asian countries and needs further investigation to adopt in cement systems. Limestone powder and metakaolin constitute 45% of the binding cement ingredient by weight (dry). The strength was evaluated using mortar, and the microstructure was determined using paste. The results show that at 28 days, the compressive strength of mortar containing 45% cement substitution by 15% limestone powder and 30% metakaolin with 1% PCE (per B45S 1:2) was 97% relative to the reference mortar. However, due to the impurities in metakaolin, its synergistic interaction is limited, which results in the compressive strength being lower than anticipated.
水泥生产是二氧化碳(CO2)排放的主要来源,而混凝土是世界上使用最广泛的建筑材料之一。为了减少水泥的二氧化碳排放量,人们在砂浆和混凝土混合物中广泛采用了辅助胶结材料。本研究将探讨决定用部分替代水泥和石灰石粉与实验室淬火热处理高岭土(又称偏高岭土)混合物制成的砂浆抗压强度发展的机理。偏高岭土在东南亚国家非常丰富,需要进一步研究在水泥系统中的应用。按重量计,石灰石粉和偏高岭土占粘结水泥成分的 45%(干)。使用砂浆对强度进行了评估,使用浆料对微观结构进行了测定。结果表明,在 28 天时,用 15%的石灰石粉和 30%的偏高岭土以及 1%的 PCE(按 B45S 1:2)替代 45%水泥的砂浆的抗压强度比参考砂浆高 97%。然而,由于偏高岭土中的杂质,其协同作用受到限制,导致抗压强度低于预期。
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引用次数: 0
PHYSICAL AND THERMAL CHARACTERISTICS OF EXPANDED FOAM GLASSES USING CRUDE GLYCEROL AS A FOAMING AGENT 使用粗甘油作为发泡剂的发泡玻璃的物理和热特性
IF 0.2 Q4 Engineering Pub Date : 2023-12-13 DOI: 10.55766/sujst-2023-03-e0371
Pat Sooksaen, Penpisuth Thongyoug
Expanded foam glasses were fabricated from a clear color soda-lime silicate glass. Crude glycerol was used as an effective foaming agent which promoted small closed cell pores. This research studied the effect of crude glycerol content on the expanding characteristics and thermal properties. The expanding behavior relied on the thermal decomposition mechanism of the foaming agent as well as the sintereing temperature. Expanded foam glasses fabricated at 850°C showed uniform pore size compared to those fabricated at other temperatures (800°C and 900°C). Pore size of the synthesized foam glasses generally increased with increasing firing temperature. The evidence of black color in some areas for samples fabricated at 800°C occurred due to incomplete combustion of crude glycerol within the bulk structure. Samples produced at 850°C and 900°C showed white color shading associated with complete combustion of carbonaceous compound. Foam glasses sintered at 900°C showed structural distortion due to glass melting during the foaming process. Large holes or gaps within the structures occured due to the sweeping and combining of gas bubbles during sintering.
膨胀泡沫玻璃由透明的钠钙硅酸盐玻璃制成。粗甘油被用作一种有效的发泡剂,可促进形成小的闭孔。这项研究探讨了粗甘油含量对膨胀特性和热性能的影响。膨胀行为取决于发泡剂的热分解机制和烧结温度。与在其他温度(800°C 和 900°C)下制造的泡沫玻璃相比,在 850°C 下制造的泡沫玻璃孔径均匀。合成泡沫玻璃的孔径一般随着烧结温度的升高而增大。在 800°C 制成的样品中,由于粗甘油在主体结构中燃烧不完全,部分区域呈现黑色。在 850°C 和 900°C 下生产的样品显示出与碳质化合物完全燃烧有关的白色阴影。在 900°C 下烧结的泡沫玻璃由于在发泡过程中玻璃熔化而导致结构变形。由于烧结过程中气泡的扫荡和结合,结构内部出现了大的孔洞或缝隙。
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引用次数: 0
ELECTRICAL PROPERTIES ON COPOLYESTER INCORPORATED IN A POLYMER NANOCOMPOSITE MATRIX - A STUDY 聚合物纳米复合材料中共聚聚酯的电学性能研究
Q4 Engineering Pub Date : 2023-10-11 DOI: 10.55766/sujst-2023-04-e0875
ASWINI R, S Kothai
This study aims at the application of the prepared Polymer Nanocomposite in the field of solid-state optoelectronic devices. Polymer Nanocomposite was prepared by incorporating iron nanoparticles, synthesized random Copolyester (BCTP), and Polypyrrole by Insitu chemical polymerization method. The application of the synthesized random Copolyester with wide biological activity due to bis chalcone moiety can also be extended to the optoelectronics field. The Copolyester (BCTP) was subjected to spectral analysis such as Fourier Transform Infrared Spectroscopy (FTIR) to confirm the chemical structural orientation. The Iron nanoparticles, Polypyrrole, and polymer nanocomposite were characterized by Fourier Transform Infrared Spectroscopy (FTIR) and powder X-ray Diffraction (PXRD). The FTIR spectroscopy confirms the formation of polymer nanocomposite by the prominent shift in stretching frequency from the starting materials taken. Powder X-ray Diffraction was used to determine the Iron Nanoparticles’ average crystallite size. The structural morphology of iron nanoparticles, Polypyrrole, and polymer nanocomposite were identified by Scanning electron Microscopy. The SEM images gave the view of Iron nanoparticles, Polypyrrole was seated in the Polymer matrix. The specific capacitance for the newly synthesized Polymer Nanocomposite was found to be 58.88 F/g by Cyclic Voltammetric analysis. The electrochemical behavior of the random copolyester (BCPT), Iron nanoparticles, Polypyrrole, and polymer nanocomposite was carried out by Impedance analysis. This confirms the Polymer Nanocomposites were conducting nature with good ionic conductance of 6.89 × 10-5 S cm-1.
本研究旨在将所制备的聚合物纳米复合材料应用于固态光电器件领域。采用原位化学聚合的方法,将铁纳米粒子与合成的无规共聚聚酯(BCTP)和聚吡咯结合,制备了聚合物纳米复合材料。由于其查尔酮部分的存在,所合成的随机共聚酯具有广泛的生物活性,其应用也可扩展到光电子领域。用傅里叶红外光谱(FTIR)等光谱分析方法确定了共聚聚酯(BCTP)的化学结构取向。采用傅里叶变换红外光谱(FTIR)和粉末x射线衍射(PXRD)对铁纳米粒子、聚吡咯和聚合物纳米复合材料进行了表征。FTIR光谱证实了聚合物纳米复合材料的形成,从起始材料的拉伸频率显著变化。采用粉末x射线衍射法测定了铁纳米粒子的平均晶粒尺寸。利用扫描电镜对铁纳米粒子、聚吡咯和聚合物纳米复合材料的结构形态进行了表征。SEM图像显示铁纳米颗粒,聚吡咯位于聚合物基体中。循环伏安分析表明,该聚合物纳米复合材料的比电容为58.88 F/g。通过阻抗分析研究了随机共聚酯(BCPT)、铁纳米粒子、聚吡咯和聚合物纳米复合材料的电化学行为。这证实了聚合物纳米复合材料具有良好的导电性质,离子电导率为6.89 × 10-5 S cm-1。
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引用次数: 0
BROACHING UNCOUTH WATER LEVEL SNAG IN UNDERGROUND AGRICULTURE FIELD THROUGH WIRELESS SENSORS 利用无线传感器拉探地下农田中不平整的水位障碍
Q4 Engineering Pub Date : 2023-10-09 DOI: 10.55766/sujst-2023-04-e0855
Muhammad Zuhair Zuhair, Shahzad Ashraf, Mahnoor Iqbal, Syed Zain Raza Rizvi, Alief Khokhar, Muhammad Asgher Nadeem Nadeem
The major problem faced by the agriculture industry is the growth of seeds at optimal fertility. Such uncouth fertility occurs when either no water reaches under soil seed or some obstacles prevent it. This issue degrades agriculture growth at an aggravation level and consequently barren the land. A wireless sensor-based communication model has been developed to notice the accurate status of the water level reaching seeds of various crops such as wheat, maize, barley, and cotton with soil types Loamy, Silty clay, and Black soil. In the proposed model, "Broadening Uncouth Water Level Snag in Underground Agriculture Field with Wireless Sensors" (BUWLN), the water level would be measured in real time and the data would be transmitted to a base station accordingly. The 8 sensor nodes and a base station would be deployed accompanied by an Arduino package in an area of 90 x 30 square feet to monitor water levels efficiently. The study will keep track of water levels, and the farmer will be informed of the water level so they may manage water resources more effectively. In addition, farmers will also be aware of the field if water is distributed uniformly so that the crops yield increases. The performance of the proposed BUWLN model has been compared with Remote water-level monitoring system (RWMS), Low cost wireless sensor network (LCSN), and Ensemble groundwater level prediction (E-GWLP) by conducting simulation using PROTEUS. result showed that the proposed BUWLN model has enough potential for future growth.
农业面临的主要问题是种子在最佳肥力下的生长。当没有水到达土壤种子下或有一些障碍阻止它时,就会发生这种不正常的肥力。这一问题使农业增长恶化,从而使土地贫瘠。一种基于无线传感器的通信模型已经被开发出来,用于注意各种作物(如小麦、玉米、大麦和棉花)在土壤类型为壤土、粉质粘土和黑土时到达种子的水位的准确状态。在“利用无线传感器拓宽地下农田的不平坦水位障碍”(BUWLN)模型中,水位将被实时测量,并相应地将数据传输到基站。8个传感器节点和一个基站将与Arduino包一起部署在90 x 30平方英尺的面积上,以有效地监测水位。这项研究将跟踪水位,农民将被告知水位,这样他们就可以更有效地管理水资源。此外,如果水均匀分布,农民也会意识到田地,从而提高作物产量。利用PROTEUS进行仿真,将所提出的BUWLN模型与远程水位监测系统(RWMS)、低成本无线传感器网络(LCSN)和集合地下水位预测(E-GWLP)进行性能比较。结果表明,所提出的BUWLN模型具有足够的发展潜力。
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引用次数: 0
HYDROGEN AND METHANE GAS CONTENT IN SYNGAS FROM THE PYROLYSIS OF MELALEUCA CAJUPUTI AND SHOREA WOOD 千层木和海岸木热解合成气中氢和甲烷气体的含量
Q4 Engineering Pub Date : 2023-10-09 DOI: 10.55766/sujst-2023-04-e0465
Teguh Suprianto
The increasing demand for energy and the depletion of fossil energy supplies require research to find renewable energy sources. Biomass is a very potential energy source and biomass gasification is a technique to produce syngas. Melaleuca Cajuputi (Gelam) and Shorea sp (Meranti) are one of the types wood plant that are widely available in Indonesia. This study aims to reveal the potential of biomass from swamp-growing plants, Melaleuca Cajuputi, and land-growing plants, Shorea, through a gasification process to produce syngas containing hydrogen and methane gas. Pyrolysis of biomass, Melaleuca Cajuputi and Shorea sawdust, using a fixed bed reactor at a temperature varying from 200 °C to 450 °C with a heating rate of 10 °C/minute for one hour. Hydrogen gas and methane gas resulting from pyrolysis were analyzed to determine the characteristics of the syngas produced. FTIR test was performed to support the experimental analysis. The experimental results show that Melaleuca Cajuputi wood has a lower peak FTIR intensity than Shorea wood. Melaleuca Cajuputi produces more hydrogen, while Shorea wood produces more methane gas. The highest hydrogen gas content was produced from Melaleuca Cajuputi and Shorea at temperatures of 315 °C at 1746 ppm and 1503 ppm at 367 °C respectively. Meanwhile, the highest methane gas content was produced by Shorea and Melaleuca Cajuputi wood, 200,000 ppm at 370 °C and 63,200 ppm at 318 °C respectively. The intensity of functional groups from biomass affects the gas produced from pyrolysis.
能源需求的增加和化石能源供应的枯竭要求研究寻找可再生能源。生物质是一种非常有潜力的能源,生物质气化是一种生产合成气的技术。千层木(Gelam)和Shorea sp (Meranti)是印度尼西亚广泛使用的木本植物之一。本研究旨在揭示沼泽植物千禧年(Melaleuca Cajuputi)和陆地植物Shorea的生物质通过气化过程产生含氢和甲烷气体的合成气的潜力。生物质、千层木屑和Shorea木屑的热解,采用固定床反应器,温度为200℃~ 450℃,升温速率为10℃/分钟,热解1小时。对热解产生的氢气和甲烷气体进行了分析,以确定所产生的合成气的特征。FTIR测试支持实验分析。 实验结果表明,千层木的FTIR峰值强度低于杉木。千层木产生更多的氢气,而雪梨木产生更多的甲烷气体。在315°C, 1746 ppm和1503 ppm的温度下,千禧年和雪梨产生的氢气含量最高。与此同时,杉木和千层木的甲烷气体含量最高,分别在370℃和318℃时达到20万ppm和63200 ppm。生物质中官能团的强度影响热解产生的气体。
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 Pyrolysis of biomass, Melaleuca Cajuputi and Shorea sawdust, using a fixed bed reactor at a temperature varying from 200 °C to 450 °C with a heating rate of 10 °C/minute for one hour. Hydrogen gas and methane gas resulting from pyrolysis were analyzed to determine the characteristics of the syngas produced. FTIR test was performed to support the experimental analysis.
 The experimental results show that Melaleuca Cajuputi wood has a lower peak FTIR intensity than Shorea wood. Melaleuca Cajuputi produces more hydrogen, while Shorea wood produces more methane gas. The highest hydrogen gas content was produced from Melaleuca Cajuputi and Shorea at temperatures of 315 °C at 1746 ppm and 1503 ppm at 367 °C respectively. Meanwhile, the highest methane gas content was produced by Shorea and Melaleuca Cajuputi wood, 200,000 ppm at 370 °C and 63,200 ppm at 318 °C respectively. The intensity of functional groups from biomass affects the gas produced from pyrolysis.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135146711","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
EFFICACY OF NANO SUPPLEMENTARY CEMENTITIOUS MATERIALS ON MECHANICAL PROPERTIES OF LOW DENSITY FOAMED CONCRETE 纳米补充胶凝材料对低密度泡沫混凝土力学性能的影响
Q4 Engineering Pub Date : 2023-10-09 DOI: 10.55766/sujst-2023-04-e0958
Yogesh Tambe, Pravin Nemade
Low density foamed concrete (LDFC) serves as an effective construction material with structural and thermal characteristics. This study reports results of experimental investigations on mechanical properties of LDFC including, thermal conductivity and drying shrinkage. Three different densities ±800, ±1000 and ±1300 kg/m3, were made with two cementitious additives like Nano-GGBS and Nano-RHA in LDFC matrix in the form of SCM. The aim of this study is to investigate the effects of various percentages of SCM on compressive strength, split tensile strength, flexural strength, thermal conductivity and drying shrinkage up to 28 days on LDFC specimens. The experimental outcomes consistently represents that the 28 days mechanical strengths, thermal conductivity and drying shrinkage increased with increasing percentage of Nano-GGBS and Nano-RHA. The 10% replacement of SCM of both the materials shows good agreement on the performance of LDFC. The split-tensile strength and flexural strength attains in the range of 19–21% and 33–46% related with 28 days compressive strength. The thermal insulation and drying shrinkage of LDFC specimens reduced with the increased density. The purpose of this research to assess the efficacy of Nano-GGBS and Nano-RHA as a SCM considering aspects of economical and sustainable concrete in LDFC matrix. It is observed that, with increase in SCM percentages, the shrinkage strain increases with testing age. The drying shrinkage of LDFC specimens reduces with density. Overall, the 10% addition of Nano-GGBS and Nano-RHA as filler in LDFC production minimizes the load on consumption of natural resources, CO2 emissions and achieves economy.
低密度泡沫混凝土(LDFC)是一种具有结构和热特性的有效建筑材料。本研究报告了LDFC的力学性能,包括热导率和干燥收缩率的实验研究结果。采用纳米ggbs和纳米rha两种胶凝剂,在LDFC基质中以SCM的形式制备了密度分别为±800、±1000和±1300 kg/m3的三种不同的胶凝材料。本研究的目的是研究不同比例的SCM对LDFC试件抗压强度、劈裂抗拉强度、抗弯强度、导热系数和28天干燥收缩率的影响。实验结果一致表明,随着纳米ggbs和纳米rha含量的增加,28天机械强度、导热系数和干燥收缩率均有所提高。将两种材料的SCM替换10%,LDFC的性能表现出良好的一致性。劈裂抗拉强度和抗弯强度在28 d抗压强度的19 ~ 21%和33 ~ 46%之间。随着密度的增加,LDFC试样的绝热性能和干燥收缩率降低。本研究的目的是评估纳米- ggbs和纳米- rha作为SCM的有效性,考虑到LDFC基质中混凝土的经济性和可持续性。观察到,随着SCM比例的增加,收缩应变随试验龄期的增加而增加。LDFC试样的干燥收缩率随密度的增大而减小。总体而言,在LDFC生产中添加10%的纳米- ggbs和纳米- rha作为填料,可以最大限度地减少自然资源消耗和二氧化碳排放,实现经济效益。
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引用次数: 0
POWER SPECTRAL ANALYSIS OF VARYING COMPLEXITY TASKS USING EEGLAB 使用eeglab进行不同复杂任务的功率谱分析
Q4 Engineering Pub Date : 2023-10-09 DOI: 10.55766/sujst-2023-04-e0741
Varsha Lokare, Kiwelekar A.W., Netak L.D., N.S. Jadhav
Analysis of the effects of increasing degrees of complexity on students’ brains is the primary topic of this research. Therefore, this study aims to use Electroencephalography (EEG) to determine the task’s difficulty level. This research examined assertions of broad mathematical and logical difficulty that can be addressed with the “C programming language.” The EEGLAB software has been used to analyze brain waves’ power spectrums while solving problem statements of different degrees of complexity. Most significantly, we discovered that as problem statements get more complicated, the strength of the Alpha, Beta, and Theta bands rises. Input features for machine learning classifiers have included descriptive statistical metrics such as mean, standard deviation, skewness, and kurtosis. Specifically, we have compared and analyzed the efficacy of four ML classifiers: Logistic Regression, Neural Network, Decision Tree, and Support Vector Machine. To classify EEG data into “easy” and “hard” categories for C programming problem statements, the DT classifier has been found to perform better with a 69.23% accuracy. The results of this research can be used to generate test questions for open-book exams, and higher-order laboratory experiments.
分析复杂程度的增加对学生大脑的影响是本研究的主要主题。因此,本研究旨在利用脑电图(EEG)来确定任务的难度水平。这项研究检查了可以用“C编程语言”解决的广泛的数学和逻辑困难的断言。EEGLAB软件已被用于在解决不同复杂程度的问题陈述时分析脑电波的功率谱。最重要的是,我们发现,随着问题陈述变得更加复杂,Alpha、Beta和Theta波段的强度也会上升。机器学习分类器的输入特征包括描述性统计指标,如平均值、标准差、偏度和峰度。具体来说,我们比较和分析了四种机器学习分类器的有效性:逻辑回归、神经网络、决策树和支持向量机。为了将EEG数据分类为C编程问题语句的“简单”和“困难”类别,DT分类器表现更好,准确率为69.23%。本研究结果可用于开卷考试和高阶实验室实验的试题生成。
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引用次数: 0
期刊
Suranaree Journal of Science and Technology
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