Journal of Engineering and Technological Sciences最新文献_第6页

Progress and Challenges of Biological Leaching of Heavy Metal in Coal Ash from a Power Plant 电厂煤灰重金属生物浸出研究进展与挑战

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Journal of Engineering and Technological Sciences Pub Date : 2023-03-31 DOI: 10.5614/j.eng.technol.sci.2023.55.1.8

Y. Lisafitri, E. Kardena

{"title":"Progress and Challenges of Biological Leaching of Heavy Metal in Coal Ash from a Power Plant","authors":"Y. Lisafitri, E. Kardena","doi":"10.5614/j.eng.technol.sci.2023.55.1.8","DOIUrl":"https://doi.org/10.5614/j.eng.technol.sci.2023.55.1.8","url":null,"abstract":"Bioleaching is a technique for reducing the heavy metal content of coal ash by using bacteria, fungi, or yeast. Previous studies in heavy metal bioleaching of coal ash discussed the factors affecting the process, but as yet there is little information on the challenges of using microorganisms. Therefore, this study aimed to obtain comprehensive information regarding the use of microorganisms in heavy metal bioleaching. Heavy metal concentrations in coal ash are low, and the metals are diverse. The components of coal ash are complexes that cannot leach certain heavy metals according to previous studies. These low concentrations and complex components make it difficult to investigate the bioleaching mechanism. The combination of biological and chemical interactions involves various components in this system. The high concentration of iron and heavy metal leached could be toxic for microorganisms. The process is influenced by several factors, such as particle size, pH, and pulp density. Most heavy metal bioleaching studies on coal ash have been conducted on a small scale to control conditions affecting the process. Bioleaching kinetics in coal is a liquid-solid reaction that can be represented by the shrinking core model, which was mainly used in this study.","PeriodicalId":15689,"journal":{"name":"Journal of Engineering and Technological Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47746915","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

Design of a Novel Efficient High-Gain Ultra-Wide-Band Slotted H-Shaped Printed 2×1 Array Antenna for Millimeter-Wave Applications with Improvement of Bandwidth and Gain via the Feed Line and Elliptical Edges 一种用于毫米波应用的新型高效高增益超宽带开槽H形印刷2×1阵列天线的设计，通过馈线和椭圆边缘提高带宽和增益

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Journal of Engineering and Technological Sciences Pub Date : 2023-03-31 DOI: 10.5614/j.eng.technol.sci.2023.55.1.7

Tibermacine Badreddine, H. Zahra, Guesbaya Tahar

{"title":"Design of a Novel Efficient High-Gain Ultra-Wide-Band Slotted H-Shaped Printed 2×1 Array Antenna for Millimeter-Wave Applications with Improvement of Bandwidth and Gain via the Feed Line and Elliptical Edges","authors":"Tibermacine Badreddine, H. Zahra, Guesbaya Tahar","doi":"10.5614/j.eng.technol.sci.2023.55.1.7","DOIUrl":"https://doi.org/10.5614/j.eng.technol.sci.2023.55.1.7","url":null,"abstract":"This paper describes design procedure of a high-performance miniaturized antenna with an array configuration, which contributes to enhancing the communication system’s performance. The basic antenna features a compact size (6 x 6) mm2, and its single element is an H-shaped slotted patch printed on the top side of a Rogers RT5880 substrate, with a relative permittivity and thickness of 2.2 and 0.3 mm, respectively. The edge-to-edge distance of the 2 × 1 array antenna is 9 x 14 mm2, and the isolation between its radiation elements is 4.5 mm. To increase the capabilities of the antenna in terms of gain and bandwidth, we proceeded to use the 2 × 1 array configuration and then optimized the model via either the width of the feed line or the elliptical edges of the patch. The miniaturized array antenna achieved a peak gain of 12.56 dB, a directivity of 13.11 dBi, and a return loss of -47.52 dB at a resonance frequency of 91.5 GHz, with a radiation efficiency of more than 91% over an operating bandwidth of 15.83 GHz, ranging from 79.7 GHz to 95.6 GHz. The design and simulation results of the proposed antenna were obtained using the CST Studio software.","PeriodicalId":15689,"journal":{"name":"Journal of Engineering and Technological Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46846985","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

Pixel Value Graphical Password Scheme: Analysis on Time Complexity performance of Clustering Algorithm for Passpix Segmentation 像素值图形密码方案:密码分割聚类算法的时间复杂度性能分析

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Journal of Engineering and Technological Sciences Pub Date : 2023-03-31 DOI: 10.5614/j.eng.technol.sci.2023.55.1.6

M. Yunus, M. Isa, M. Shukran, Norshahriah Wahab, Syarifah Bahiyah Rahayu, A. F. A. Fadzlah

{"title":"Pixel Value Graphical Password Scheme: Analysis on Time Complexity performance of Clustering Algorithm for Passpix Segmentation","authors":"M. Yunus, M. Isa, M. Shukran, Norshahriah Wahab, Syarifah Bahiyah Rahayu, A. F. A. Fadzlah","doi":"10.5614/j.eng.technol.sci.2023.55.1.6","DOIUrl":"https://doi.org/10.5614/j.eng.technol.sci.2023.55.1.6","url":null,"abstract":"Passpix is a key element in pixel value access control, containing a pixel value extracted from a digital image that users input to authenticate their username. However, it is unclear whether cloud storage settings apply compression to prevent deficiencies that would alter the file's 8-bit attribution and pixel value, causing user authentication failure. This study aims to determine the fastest clustering algorithm for faulty Passpix similarity classification, using a dataset of 1,000 objects. The source code for the K-Means, ISODATA, and K-Harmonic Mean scripts was loaded into a clustering experiment prototype compiled as Clustering.exe. The results demonstrate that the number of clusters affects the time taken to complete the clustering process, with the 20-cluster setting taking longer than the 10-cluster setting. The K-Harmonic Mean algorithm was the fastest, while K-Means performed moderately and ISODATA was the slowest of the three clustering algorithms. The results also indicate that the number of iterations did not affect the time taken to complete the clustering process. These findings provide a basis for future studies to increase the number of clusters for better accuracy.","PeriodicalId":15689,"journal":{"name":"Journal of Engineering and Technological Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48030308","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

An Enhanced Dynamic Spectrum Allocation Method on Throughput Maximization in Urban 5G FBMC Heterogeneous Network 城市5G FBMC异构网络吞吐量最大化的增强动态频谱分配方法

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Journal of Engineering and Technological Sciences Pub Date : 2023-03-31 DOI: 10.5614/j.eng.technol.sci.2023.55.1.5

Nurzati Iwani Othman, Ahmad Fadzil Ismail, K. Badron, W. Hashim, M. Hasan, Sofia Pinardi

{"title":"An Enhanced Dynamic Spectrum Allocation Method on Throughput Maximization in Urban 5G FBMC Heterogeneous Network","authors":"Nurzati Iwani Othman, Ahmad Fadzil Ismail, K. Badron, W. Hashim, M. Hasan, Sofia Pinardi","doi":"10.5614/j.eng.technol.sci.2023.55.1.5","DOIUrl":"https://doi.org/10.5614/j.eng.technol.sci.2023.55.1.5","url":null,"abstract":"Reports have shown that the demand for data managed by wireless systems is expected to grow by more than 500 exabytes by 2025 and beyond. 5G networks are predicted to meet these demands, provided that the spectrum resources are well managed. In this paper, an enhanced dynamic spectrum allocation (E-DSA) method is proposed, which incorporates a cooperative type of game theory called the Nash bargaining solution (NBS). It was assumed that there is one primary user (PU) and two secondary users (SU) in the network and their spectrum allocation was analyzed by testing the validity of the algorithm itself by using price weight factors to control the costs of the spectrum sharing. The solution was established by combining a proposed multiplexing method called the Filter Bank Multicarrier (FBMC) for 5G configuration, with the E-DSA algorithm to maximize the throughput of a heterogeneous 5G network. It was shown that the throughputs for 5G with E-DSA implementation were always higher than those of the ones without E-DSA. The simulation was done using the LabVIEW communication software and was analyzed based on a 5G urban macro and micro network configuration to validate the heterogeneity of the network.","PeriodicalId":15689,"journal":{"name":"Journal of Engineering and Technological Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41793498","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

Applying Eco Enzyme to Reduce Chemical Oxygen Demand (COD) Content of Artificial River Water 应用生态酶降低人工河水的化学需氧量(COD)含量

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Journal of Engineering and Technological Sciences Pub Date : 2023-03-31 DOI: 10.5614/j.eng.technol.sci.2023.55.1.9

Y. M. Yustiani, F. L. Nugroho, Fauzi Murtadho, Achmad Teguh Djayadisastra

引用次数: 0

Rapid Flood Mapping Using Statistical Sampling Threshold Based on Sentinel-1 Imagery in the Barito Watershed, South Kalimantan Province, Indonesia 基于Sentinel-1图像的印尼南加里曼丹省Barito流域统计采样阈值快速洪水制图

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Journal of Engineering and Technological Sciences Pub Date : 2023-03-31 DOI: 10.5614/j.eng.technol.sci.2023.55.1.10

M. Priyatna, M. Khomarudin, S. Wijaya, F. Yulianto, Gatot Nugroho, P. M. Afgatiani, Anisa Rarasati, Muhammad Arfin Hussein

{"title":"Rapid Flood Mapping Using Statistical Sampling Threshold Based on Sentinel-1 Imagery in the Barito Watershed, South Kalimantan Province, Indonesia","authors":"M. Priyatna, M. Khomarudin, S. Wijaya, F. Yulianto, Gatot Nugroho, P. M. Afgatiani, Anisa Rarasati, Muhammad Arfin Hussein","doi":"10.5614/j.eng.technol.sci.2023.55.1.10","DOIUrl":"https://doi.org/10.5614/j.eng.technol.sci.2023.55.1.10","url":null,"abstract":"Flood disasters occur frequently in Indonesia and can cause property damage and even death. This research aimed to provide rapid flood mapping based on remote sensing data by using a cloud platform. In this study, the Google Earth Engine cloud platform was used to quickly detect major floods in the Barito watershed in South Kalimantan province, Indonesia. The data used in this study were Sentinel-1 images before and after the flood event, and surface reflectance of Sentinel-2 images available on the Google Earth Engine platform. Flooding is detected using the threshold method. In this study, we determined the threshold using the Otsu method and statistical sampling thresholds (SST). Four SST scenarios were used in this study, combining the mean and standard deviation of the difference backscatter of Sentinel-1 images. The results of this study showed that the second SST scenario could classify floods with the highest accuracy of 73.2%. The inundation area determined by this method was 4,504.33 km2. The first, third and fourth SST scenarios and the Otsu method could reduce the flood load with an overall accuracy of 48.37%, 43.79%, 55.5% and 68.63%, respectively. The SST scenario is considered to be a reasonably good method for rapid flood detection using Sentinel-1 satellite imagery. This rapid detection method can be applied to other areas to detect flooding. This information can be quickly produced to help stakeholders determine appropriate flood management strategies.","PeriodicalId":15689,"journal":{"name":"Journal of Engineering and Technological Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45486214","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

Physicothermal and Topography Analysis of Polyurethane Modified Bitumen with Rediset for WMA Application 用于WMA应用的Rediset聚氨酯改性沥青的物热和形貌分析

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Journal of Engineering and Technological Sciences Pub Date : 2023-03-17 DOI: 10.5614/j.eng.technol.sci.2023.55.1.4

F. H. Khairuddin, Siti Zubaidah Mohd Asri, N. Misnon, N. Yusoff, Auni Diyana Fadzil, K. Z. Ku Ahmad

{"title":"Physicothermal and Topography Analysis of Polyurethane Modified Bitumen with Rediset for WMA Application","authors":"F. H. Khairuddin, Siti Zubaidah Mohd Asri, N. Misnon, N. Yusoff, Auni Diyana Fadzil, K. Z. Ku Ahmad","doi":"10.5614/j.eng.technol.sci.2023.55.1.4","DOIUrl":"https://doi.org/10.5614/j.eng.technol.sci.2023.55.1.4","url":null,"abstract":"The effects of modifying a 60/70 penetration grade bitumen with 3 wt% polyurethane (PU) and a Warm Mix Asphalt (WMA) additive, namely Rediset, were explored in this research. Penetration, softening point, viscosity, and ductility tests were employed for consistency testing, while the differential scanning calorimetry was used for thermal characterization. The topography and surface roughness of the modified bitumen were evaluated using atomic force microscopy. Adding PU and Rediset to the base bitumen (BB) stiffens the BB slightly, giving it a lower penetration and higher viscosity values, which improves the rutting resistance. The thermal transition of the glass temperature and melting temperature are similar to the BB. Furthermore, the addition of PU and Rediset to BB shows a clear bee structure topography in dry condition, indicating better dispersion, while in wet condition, the bee structure is mostly affected in the catana and para phase that reveals a reduced in the the wax content of the BB. The bitumen modified with PU and Rediset has a lower surface roughness than BB, making it less susceptible to moisture damage.","PeriodicalId":15689,"journal":{"name":"Journal of Engineering and Technological Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45246954","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

Structure Simulation on Portable Commuter Bike Considering Frame Design and Materials Alternatives 考虑车架设计和材料选择的便携式通勤自行车结构仿真

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Journal of Engineering and Technological Sciences Pub Date : 2023-03-06 DOI: 10.5614/j.eng.technol.sci.2023.55.1.2

B. Iskandriawan

引用次数: 0

Physical and Chemical Properties of Indonesian Coffee Beans for Different Postharvest Processing Methods 不同采收后加工方法对印尼咖啡豆理化特性的影响

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Journal of Engineering and Technological Sciences Pub Date : 2023-03-06 DOI: 10.5614/j.eng.technol.sci.2023.55.1.1

E. Yusibani, P. Woodfield, A. Rahwanto, M. S. Surbakti, Rajibussalim Rajibussalim, R. Rahmi

{"title":"Physical and Chemical Properties of Indonesian Coffee Beans for Different Postharvest Processing Methods","authors":"E. Yusibani, P. Woodfield, A. Rahwanto, M. S. Surbakti, Rajibussalim Rajibussalim, R. Rahmi","doi":"10.5614/j.eng.technol.sci.2023.55.1.1","DOIUrl":"https://doi.org/10.5614/j.eng.technol.sci.2023.55.1.1","url":null,"abstract":"The purpose of this study was to identify the physical and chemical properties of Indonesian coffee beans for different postharvesting methods after being roasted. Several types of Indonesian export coffee, i.e., Gayo Luwak coffee, Wamena coffee, Toraja coffee, Gayo coffee, Flores coffee and Kintamani coffee, were used in the present study. Each coffee has its own aroma and taste according to the location, soil type, and land elevation. The roasting process started with preheating the roasting machine, after which the samples were roasted for about 15 minutes at 215℃ to obtain the medium-to-dark (MTD) roasting level. The physical properties measured included density, mass loss, porosity, water content, and morphology using a scanning electron microscope. The transmittance spectrum was observed by Fourier transform infrared spectroscopy (FTIR). The physical properties of the coffee were successfully measured. The bulk density varied from 0.6 to 0.7 g/cm3, and particle density was about 0.9 g/cm3 for green beans. The roasting process reduced the bulk and particle density to 0.3 g/cm3 on average and 0.8 g/cm3, respectively. The fully-washed condition gave an overlapping spectrum for green and roasted beans, which shows that the roasting process did not affect the spectrum. The results can be used to study the coffee quality resulting from different postharvest processing methods.","PeriodicalId":15689,"journal":{"name":"Journal of Engineering and Technological Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44072787","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: 3

Investigation on Neutronic Parameters of the KLT-40S Reactor Core with U3Si2-FeCrAl using SCALE Code 用SCALE程序研究含U3Si2-FeCrAl的KLT-40S堆芯的电子参数

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Journal of Engineering and Technological Sciences Pub Date : 2023-03-06 DOI: 10.5614/j.eng.technol.sci.2023.55.1.3

Alif Al Mahfudz, A. Agung, A. W. Harto

{"title":"Investigation on Neutronic Parameters of the KLT-40S Reactor Core with U3Si2-FeCrAl using SCALE Code","authors":"Alif Al Mahfudz, A. Agung, A. W. Harto","doi":"10.5614/j.eng.technol.sci.2023.55.1.3","DOIUrl":"https://doi.org/10.5614/j.eng.technol.sci.2023.55.1.3","url":null,"abstract":"From a safety point of view, the fuel-cladding of the current design of the KLT-40S reactor still carries a potential risk in the event of a loss-of-coolant accident (LOCA) allowing the formation of hydrogen gas. The concept of accident tolerant fuels (ATF) offers a variety of new safer fuel-cladding materials, one of which is U3Si2-FeCrAl, a potential fuel-cladding combination according to various research sources. In this research, a study of neutronic parameters (1) cycle length, (2) reactivity feedback coefficient, and (3) reactor proliferation resistance was performed with ATF material U3Si2-FeCrAl as fuel-cladding in the KLT-40S reactor core. Modeling and simulation of the ATF-fueled KLT-40S reactor core were performed using KENO-VI and TRITON modules from SCALE code. The results showed that replacement of the fuel-cladding material with the ATF material in the KLT-40S reactor resulted in a shorter cycle length, and the enrichment required to reproduce the original cycle length was above the safeguard limit. The fuel temperature, moderator temperature, and void reactivity coefficient were negative, although not as negative as the original ones. The spent fuel produced at the end of the cycle had good proliferation resistance, although not as good as the original one.","PeriodicalId":15689,"journal":{"name":"Journal of Engineering and Technological Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41324868","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