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Impact of different kinds of biomass mixtures on combustion performance, interaction and synergistic effects in cofiring of coal and biomass in steam power plants

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Clean Energy 2023年第5期7卷 1136-1147页

作者： Mochamad Soleh Azaria Haykal Ahmad Firman Bagja Juangsa Prihadi Setyo Darmanto Ari Darmawan Pasek Mechanical Engineering Doctoral Program Study Faculty of Mechanical and Aerospace EngineeringInstitut Teknologi BandungJl.Ganesha 10Bandung40132 Indonesia Mechanical Engineering Master Program Study Faculty of Mechanical and Aerospace EngineeringInstitut Teknologi BandungJl.Ganesha 10Bandung40132 Indonesia Energy Conversion Research Group Faculty of Mechanical and Aerospace EngineeringInstitut Teknologi BandungJl.Ganesha 10Bandung40132 Indonesia Research Center for New and Renewable Energy Institut Teknologi BandungJl.Ganesha 10Bandung40132 Indonesia Research and Development Center PT.PLN Indonesia Power

The cofiring of biomass and coal may be one of the most effective methods to improve energy utilization efficiency and reduce greenhouse gas *** study aims to investigate combustion performance,interaction and synergistic effects in the cofiring of coal and three types of *** fuel consisting of coal and three types of biomass such as sawdust,rice husk and solid recovery fuel was selected as the research *** and proximate analysis and differential thermogravimetric analysis with heating rates of between 10°C and 40°C/minute are used to analyse combustion *** of combustion in a 600-MWe steam power plant with a Carolina-type boiler is also carried out with the help of computational fluid dynamic(CFD)analysis to see the effect of the interaction and synergy of the mixed fuel on the performance of the steam *** effect on the com-bustion process in the combustion chamber of a steam power plant is also *** on the analysis of several test results of parameters such as ignition temperature,burnout temperature,calorific value of the fuel mixtures as well as CFD simulation,the results of the study show a strong indication of a positive synergy in mixing some of these biomasses as compared with a fuel mix-ture consisting only of coal and one type of *** no power derating of the boiler occurs until the biomass content in the fuel mixture is~30%on a mass *** reduction in greenhouse gas emissions also appears significant from the results of the CFD simulation of this study,which is characterized by a decrease in the fraction of CO_(2) in flue gas from 21.5%for coal alone as fuel to 15.9%in the case of cofiring excluding the CO_(2) attributed to the biomass.

关键词： biomass sawdust cofiring coal-fired power plant combustion decarbonization computational fluids dynamic

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Characteristics of palm oil-based oleogel and its potency as a shortening replacer

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South African Journal of Chemical engineering 2023年 43卷 197-203页

作者： Suriaini, Nanda Arpi, Normalina Syamsuddin, Yanna Supardan, Muhammad Dani Doctoral Program School of Engineering Post Graduate Program Universitas Syiah Kuala Banda Aceh 23111 Indonesia Department of Agricultural Product Technology Universitas Syiah Kuala Banda Aceh 23111 Indonesia Halal Research Center Universitas Syiah Kuala Banda Aceh 23111 Indonesia Department of Chemical Engineering Universitas Syiah Kuala Banda Aceh 23111 Indonesia

This investigation aimed to determine the effect of beeswax (BW) and palm oil concentrations on the characteristics of oleogels which were then compared with a commercial shortening to evaluate their potential to be used as a shortening replacer. The characteristics of palm oil-based oleogel were investigated. Crude palm oil (CPO) and palm oil-based cooking oil (CO) are both rich in palmitic acid (C16:0), oleic acid (C18:1), and linoleic acid (C18:2), but the amount of total saturated fatty acids in CPO is higher than in commercial CO. The binary blends of palm oil (CPO and CO) and beeswax (BW) were used in various concentrations to prepare palm oil-based oleogel. Oleogels containing higher concentrations of BW had a greater oil binding capacity. The addition of BW produced needle-like and spherical crystals. X-ray diffraction analysis revealed a broad peak between 5.6° 2θ and 21.2° 2θ, (4.6 Å), resembling β polymorphism produced by monoacylglycerol aliphatic chains. The solid fat content of the CPO-based oleogel indicated that the product was more heat-resistant and had a profile more similar to shortening than the CO-based oil. As the BW concentration increased, the peak temperature of the sample also increased according to the differential scanning calorimetry analysis. The characteristics of palm oil-based oleogel products were comparable to that of commercial shortening;thus, they can be used as shortening replacers. © 2022 The Author(s)

关键词： Beeswax Oleogel Palm oil Shortening

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A new approach to SPECT attenuation correction without transmission measurements

A new approach to SPECT attenuation correction without trans...

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2000 IEEE Nuclear Science Symposium Conference Record

作者： Kudo, Hiroyuki Nakamura, Hiroki Inst. of Info. Sci. and Electron. University of Tsukuba Tsukuba 305-8573 Japan Doctoral Program in Engineering University of Tsukuba Tsukuba 305-8573 Japan

We propose a new approach to correct for non-uniform photon attenuation in SPECT imaging without transmission measurements. The new method can be considered a variant of Natterer's method based on the consistency condition. The method is based on estimating parameters of the attenuation map model such that the consistency condition is satisfied. However, to improve the accuracy and stability of Natterer's method, we introduce two new concepts in this problem. The first new concept is a new consistency condition based on the ordered subsets EM iterative attenuation correction, which is more informative than Natterer's one. The second new concept is a topologically constrained labeling method to estimate a segmented attenuation map. This labeling method allows to deal with complicated attenuation maps consisting of more than one regions or having concave boundaries. The performance of the proposed method is tested with simulated data.

关键词： Computerized tomography

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The effectiveness of distance learning through Edmodo and Video Conferencing Jitsi Meet

The effectiveness of distance learning through Edmodo and Vi...

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2020 National Physical Education Seminar, SNPF 2020

作者： Asfar, A.M.I.T. Asfar, A.M.I.A. Department of Mathematics Education STKIP Muhammadiyah Bone Indonesia Doctoral Program Science Education Universitas Negeri Makassar Indonesia Department of Chemical Engineering Politeknik Negeri Ujung Pandang Indonesia

Distance learning is intensively used since the outbreak of the Covid-19 requires the lecture to be done from home. A variety of applications to support distance learning, including e-learning Edmodo as a learning management system with video conference jits meet to optimize lectures online. The purpose of this study is to see the course's effectiveness by using e-learning Edmodo with or without a video conference Jitsi Meet in reducing students' mistakes in answering the questions given. Research design using experimental type posttest, only group control design. The object of research consists of two classes, namely class control and class comparison. The analysis results indicate the use of an e-learning Edmodo integrated video conference Jitsi Meet provides advantages compared to only using e-learning Edmodo because it can reduce the level of error in answering questions by 50%. © Published under licence by IOP Publishing Ltd.

关键词： Video conferencing

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Adaptive Strategies and Handover Optimization in 5G Networks to Address High Mobility Challenges

Adaptive Strategies and Handover Optimization in 5G Networks...

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2024 International Conference on Electrical engineering and Informatics, ICELTICs 2024

作者： Murhaban Syahrial Arif, Teuku Yuliar Arnia, Fitri Doctoral Program School of Engineering Universitas Syiah Kuala Universitas Teuku Umar Departement Information Technology Engineering Banda Aceh Aceh Barat Indonesia Universitas Syiah Kuala Department of Electrical and Computer Engineering Banda Aceh Indonesia

ISBN: (纸本)9798350366822

This study develops an adaptive handover strategy in 5G networks to tackle high mobility challenges and improve service continuity and quality. The research method uses a 5G network emulator with a topology of four base stations (gNBs) to test user equipment (UE) speeds of 20 km/h and 130 km/h. The adaptive algorithm developed utilizes data from the Received Signal Strength Indicator (RSSI) as well as the speed and direction of user mobility to make optimal handover decisions. The results show that at a speed of 130 km/h, the average handover latency reaches 12 ms, compared to 8 ms at 80 km/h. Additionally, the signal quality (RSSI) is lower at higher speeds, negatively affecting service quality. This adaptive algorithm successfully reduces handover latency and improves the stability and efficiency of the overall network. The testing also indicates that this adaptive algorithm can predict handover targets by considering UE speed and direction and uses hysteresis mechanisms to prevent overly frequent handovers. By employing technologies such as Multiple Input Multiple Output (MIMO) and beamforming, this strategy is expected to maintain high service quality even under high mobility conditions. © 2024 IEEE.

关键词： 5G mobile communication systems

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Segmented attenuation map reconstruction from incomplete transmission data

Segmented attenuation map reconstruction from incomplete tra...

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2000 IEEE Nuclear Science Symposium Conference Record

作者： Kudo, Hiroyuki Nakamura, Hiroki Inst. of Info. Sci. and Electron. University of Tsukuba Tsukuba 305-8573 Japan Doctoral Program in Engineering University of Tsukuba Tsukuba 305-8573 Japan

Accurate reconstruction of attenuation maps from incomplete sinograms are required in some cases of SPECT and PET imaging. This paper proposes a new method to directly reconstruct segmented attenuation maps from the incomplete sinograms. The proposed method is based on an image labeling technique where an optimum label configuration minimizing some energy function is found by using a stochastic sampling with simulated annealing Unlike ordinary image labeling techniques, however, we introduce a powerful constraint called the topology-preserving constraint. This constraint reduces the search space to a set of label configurations having the same topology as the known topology of the attenuation map in question. The experimental results demonstrate that the topology-preserving constraint is powerful enough to reconstruct accurate segmented attenuation aiaps from the incomplete sinograms. The proposed method is tested with simulated data and PET transmission data.

关键词： Image reconstruction

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Learning design: Integrated local tradition ma'dawa-dawa, ma'manu-manu, ma'pettuada based on android

Learning design: Integrated local tradition ma'dawa-dawa, ma...

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2020 National Physical Education Seminar, SNPF 2020

作者： Nurannisa, A. Asfar, A.M.I.T. Asfar, A.M.I.A. Department of Mathematics Education STKIP Muhammadiyah Bone Indonesia Doctoral Program Science Education Universitas Negeri Makassar Indonesia Department of Chemical Engineering Politeknik Negeri Ujung Pandang Indonesia

Mathematical skills that are of major concern at this time are extrapolation abilities which require students to be able to solve mathematical problems with abstract and hierarchical concepts. To improve this capability, it can be done by integrating local technology-based traditions that have an educational philosophy. This study aims to review the integrated learning design of the local culture of Ma'dawa-dawa, Ma'manu-manu, Ma'pettuada based on android in improving extrapolation abilities. This research uses a descriptive qualitative research method with data in the form of analysis of some literature that supports research studies and is arranged descriptively containing a theoretical basis. The results of the study indicate that designed learning can be a means of developing extrapolation abilities through the integration of technology-based local cultures. © Published under licence by IOP Publishing Ltd.

关键词： Extrapolation

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Evaluation of Enrichment in Ontology-based Knowledge Management System

Evaluation of Enrichment in Ontology-based Knowledge Managem...

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2023 International Conference on Smart-Green Technology in Electrical and Information Systems, ICSGTEIS 2023

作者： Dessy Hariyanti, Ni Kadek Linawati, Linawati Made Oka Widyantara, I. Putra Sastra, Nyoman Adisusilo, Anang Kukuh Wayan Budi Sentana, I. Dewa Made Bayu Atmaja Darmawan, I. Universitas Udayana Study Program of Doctoral Engineering Science Indonesia Universitas Udayana Electrical Engineering Department Indonesia Universitas Wijaya Kusuma Surabaya Engineering Department Surabaya Indonesia Macquarie University School of Computing SydneyNSW Australia

ISBN: (纸本)9798350382822

Ontology is an organization of knowledge that can represent knowledge in a structured manner. An ontology-based Knowledge Management System is a system that combines elements of knowledge management with the application of ontology as a knowledge base. Meanwhile, knowledge is dynamic and continues to develop all the time, giving rise to new knowledge. Therefore, the ontology must be updated regularly through ontology enrichment to meet adequate knowledge requirements. Ontology enrichment is carried out to ensure that the ontology remains relevant and responsive to developments in its knowledge domain. However, there are no standard stages in implementing enrichment in ontology-based Knowledge Management systems. Therefore, this research conducted a literature review to determine when and how to apply enrichment in ontology development. Data was obtained from related journals in 2018 - 2023. The method used in this research is the Systematic Literature Review method to systematically identify, review, evaluate, and interpret all available research in the area of interest with specific relevant research questions. The research results show that the ontology enrichment procedure generally includes preprocessing stages, relation extraction, and enrichment processes. Ontology enrichment is generally applied during the development of a new ontology as part of the ontology development cycle and on existing ontologies, which are a separate stage from the initial ontology development cycle. Based on these findings, the researcher provides recommendations for researchers who want to use or develop new ontology enrichment methods. © 2023 IEEE.

关键词： Ontology

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Effect of Anode Surface Conditions on Heaterless Hollow Cathode Performance 74

Effect of Anode Surface Conditions on Heaterless Hollow Cath...

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74th International Astronautical Congress, IAC 2023

作者： Hsieh, Jordan H. Huang, Yi-Lung Li, She-Shen Huang, Ping-Han Li, Yueh-Heng Department of Aeronautics and Astronautics National Cheng Kung University Tainan70101 Taiwan International Doctoral Degree Program on Energy Engineering National Cheng Kung University Tainan70101 Taiwan

The study examines the effects of planar anode surface roughness on heaterless hollow cathode discharge characteristics. Three distinct roughness levels, Ra 1.6, Ra 3.2, and Ra 6.4, were achieved using a specialized machining procedure. A pivotal observation highlights the relationship between discharge voltage and the surface texture of the anode. As surface roughness intensifies, the planar anode demands a decreased discharge voltage to uphold the primary discharge. This phenomenon can be attributed to the increased surface area from roughness, promoting efficient electron current collection. Furthermore, oscillations in discharge voltage appear to be inversely proportional to the surface roughness of the planar anode, potentially tied to variations in the neutral gas density gradient near the anode and cathode. Such insights are instrumental for standardizing hollow cathode tests and set a foundation for more in-depth research in subsequent studies. Copyright © 2023 by the International Astronautical Federation (IAF). All rights reserved.

关键词： Anode Cathode Discharge Heaterless Surface

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Humanoid control method based on human knack for human care service

Humanoid control method based on human knack for human care ...

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2002 IEEE International Conference on Systems, Man and Cybernetics

作者： Kawamura, Yuichiro Sankai, Yoshiyuki Doctoral Program in Engineering University of Tsukuba Tsukuba Ibaraki 305-8573 Japan Inst. of Eng. Mechanics and Systems University of Tsukuba Tsukuba Ibaraki 305-8573 Japan

A humanoid control method based on human knack for human care service was discussed. It was found that the humanoid model 'HRP1S' and the human model which possessed human parameters and was not able to rise by itself were used in simulation. The analysis showed that the human care by humanoid was realized and the effectiveness of the humanoid control method was verified.

关键词： Human engineering

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