Makara Journal of Technology最新文献

Briquette of Empty Fruit Bunch Fiber as an Alternative Substitution for Binderless Fuel Methods 用空果捆纤维压块替代无粘合剂燃料法

IF 0.2

Makara Journal of Technology Pub Date : 2023-12-23 DOI: 10.7454/mst.v27i3.1455

引用次数: 0

Effect of Lime Content, Curing Temperature, and Aging Condition on Low-Alkaline Concrete 石灰含量、养护温度和老化条件对低碱性混凝土的影响

IF 0.2

Makara Journal of Technology Pub Date : 2023-12-23 DOI: 10.7454/mst.v27i3.1527

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Optimization of the Building Envelope and Roof Shading to Reduce the Energy Consumption of College Low-Rise Buildings in Indonesia 优化建筑围护结构和屋顶遮阳以降低印度尼西亚高校低层建筑的能耗

IF 0.2

Makara Journal of Technology Pub Date : 2023-12-23 DOI: 10.7454/mst.v27i3.1435

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Heat Transfer Enhancement in Nanofluid Flows Augmented by Magnetic Flux 磁通量增强纳米流体流动的传热效果

IF 0.2

Makara Journal of Technology Pub Date : 2023-12-23 DOI: 10.7454/mst.v27i3.1618

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Isolation and Characterization of Caffeine-Degrading Bacteria from Coffee Plantation Areas in Malaysia 马来西亚咖啡种植区咖啡因降解细菌的分离与特征描述

IF 0.2

Makara Journal of Technology Pub Date : 2023-12-23 DOI: 10.7454/mst.v27i3.1462

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Challenges in Optimization for the Performance on Sustainability Dimensions in Reverse Logistics Social Responsibility 逆向物流社会责任可持续发展维度绩效优化的挑战

Makara Journal of Technology Pub Date : 2023-08-31 DOI: 10.7454/mst.v27i2.1445

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The Relaying Network in Free-Space Optical Communications using Optical Amplifiers in Cascaded Configuration 级联配置光放大器的自由空间光通信中继网络

Makara Journal of Technology Pub Date : 2023-08-31 DOI: 10.7454/mst.v27i2.1583

引用次数: 0

Accomplishments of Endwall Contouring on Heat Transfer in a Passage of a Turbine Blade 端壁轮廓对涡轮叶片流道传热的影响

Makara Journal of Technology Pub Date : 2023-08-31 DOI: 10.7454/mst.v27i2.1617

{"title":"Accomplishments of Endwall Contouring on Heat Transfer in a Passage of a Turbine Blade","authors":"","doi":"10.7454/mst.v27i2.1617","DOIUrl":"https://doi.org/10.7454/mst.v27i2.1617","url":null,"abstract":"The study explores axisymmetric endwall contouring with emphasis on the design of novel endwalls capable of heat load reduction. Optimizations with parameterization numerically determined by the endwall of flat shape led to the endwall of the contoured shape with substantial depletion of heat transfer in the passage of the vane. Heat transfer attributes for the generated contoured endwalls were analyzed for the exit Reynolds number of 2 × 106 . Endwall three-dimensional contouring resulted in remarkable changes in secondary flow vortices, jet-to-secondary flow interaction, and film cooling effectiveness on the flat endwall. The results pointed out that the axisymmetric convergent contouring causes a significant increase in endwall film cooling, especially for the hard-to-cooled regions throughout the vane, but the level of benefit is significantly affected by the blowing ratios. The obtained efficacy demonstrated the flow impact of the cross-passage on the proliferation of the coolant on top of the flat endwall and the amenability for jet lift-off at elevated blowing ratios. The optimal mass flow rate selection of the current work could identify the passage of the endwall, contoured with superior axial turbine efficiency and durability than that of the flat endwall.","PeriodicalId":42980,"journal":{"name":"Makara Journal of Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136036818","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

Investigating the Resistance Properties of Concrete Containing Waste Carpet Fibers 含废地毯纤维混凝土的抗阻性能研究

Makara Journal of Technology Pub Date : 2023-08-30 DOI: 10.7454/mst.v27i2.1616

{"title":"Investigating the Resistance Properties of Concrete Containing Waste Carpet Fibers","authors":"","doi":"10.7454/mst.v27i2.1616","DOIUrl":"https://doi.org/10.7454/mst.v27i2.1616","url":null,"abstract":"This research was conducted with the aim of investigating the use of waste carpet fiber (WCF) and assessing the resistance properties of concrete. The main goal of this study was to investigate the effect of the internal processing of concrete containing WCF on increasing its resistance properties. At the same time, the secondary goals pursued in the research included determining the optimal percentages of carpet fibers in improving compressive strength, tensile strength, and bending strength. The materials used included cement, aggregates, water, WCF, and super lubricant. This research applied seven mixing designs: A, B1, B2, C1, C2, D1, and D2. Mixing plan A was the control plan. Sample B1 contained 2.45 kg/m3 of WCF and 40 kg/m3 of lyca for processing, while sample B2 contained 2.45 kg/m3 of WCF and no lyca. Sample C1 contained 35.7 kg/m3 of WCF and 80 kg/m3 of lyca for processing, sample C2 contained 35.7 kg/m3 of WCF and no lyca, Sample D1 contained 12.25 kg/m3 of WCF and 120 kg/m3 of lyca for processing, and sample D2 contained 12.25 kg/m3 of WCF and no lyca. The results showed that the use of waste carpet fibers and processing by lyca reduced the compressive strength of the samples. The results of the tensile strength test revealed that the use of waste carpet fibers along with processing by lyca increased the tensile strength of the samples. Finally, the flexural strength test results showed that the use of small amounts of WCF and lyca treatment led to an increase in the flexural strength of concrete.","PeriodicalId":42980,"journal":{"name":"Makara Journal of Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136241810","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

Permeability Prediction for Expansive Soil Based on Physical Properties Using Artificial Neural Networks 基于物理性质的膨胀土渗透性人工神经网络预测

Makara Journal of Technology Pub Date : 2023-08-30 DOI: 10.7454/mst.v27i2.1623

{"title":"Permeability Prediction for Expansive Soil Based on Physical Properties Using Artificial Neural Networks","authors":"","doi":"10.7454/mst.v27i2.1623","DOIUrl":"https://doi.org/10.7454/mst.v27i2.1623","url":null,"abstract":"Permeability is a soil parameter related to the construction industry to understand the processes of infiltration, runoff, and settlement. The risk of testing errors is inevitable in permeability investigations, especially in expansive soils. Trial and error in permeability testing becomes difficult due to soils with small pore sizes and large shrinkage expansion. Several studies related to soil physical properties that affect permeability have been conducted. However, the correlation results obtained still have poor accuracy. Artificial neural networks (ANN) are machine learning systems that can change their structure to solve problems that are included in the system. The use of ANNs in data learning is applied to help the established model predict future output values with a small error value. This research aims to study the correlation between the physical properties of expansive soil that affect its permeability using ANN correlation and then produce correlation equations for future inputs. The research was conducted with input data in the form of soil liquid limit, soil plasticity index (IP), %fine grains, and soil permeability as output data. Results demonstrated a good correlation between soil physical properties and permeability, revealing high accuracy in the output regression equation.","PeriodicalId":42980,"journal":{"name":"Makara Journal of Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136241809","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