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Junior Conference on Lighting (Lighting)

作者： Hristo Antchev Dimitar Borisov Anton Andonov Section of Electrical Engineering and Electronics University of Chemical Technology and Metallurgy Sofia Bulgaria Environmental engineering University of Chemical Technology and Metallurgy Sofia Bulgaria

ISBN: (数字)9798350352757

ISBN: (纸本)9798350352764

A complete schematic diagram and results of an experimental study of an autonomous DC power supply for low-power consumers are presented. The main elements for its implementation are a photovoltaic panel, charge controller with Maximum Power Point Tracking, an ultracapacitor and a charge pump. A characteristic feature is a minimum amount of elements using to convert solar energy to DC voltage for the consumer, providing flexibility in choosing its value depending on the consumer's needs. Oscillograms from the experimental studies and results for the available stored energy and charging times at two values of the ultracapacitor - 10F and 100F - are shown.

关键词： Photovoltaic systems Maximum power point trackers Charge pumps Power supplies Lighting Voltage Solar energy

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Separation of Butyric Acid from Aqueous Solution by Methyl Isobutyl Ketone with the Introduction of Biological Buffer (EPPS/MOPS) at Elevated Temperatures

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Journal of Chemical and engineering Data 2024年第9期69卷 3093-3102页

作者： Altway, Saidah Tiwikrama, Ardila Hayu Khoiroh, Ianatul Azaim, Ahmad Hayiz Sugiarto, Kurniawan Wahyu Honora, Faradiba Amirah, Farah Rahayu, Serli Dwi Pudjiastuti, Lily Prajitno, Danawati Hari Department of Industrial Chemical Engineering Institut Teknologi Sepuluh Nopember Kampus ITS Keputih Surabaya60111 Indonesia Department of Chemical Engineering and Biotechnology National Taipei University of Technology 1 Section 3 Zhongxiao East Road Taipei106-344 Taiwan Department of Chemical and Environmental Engineering University of Nottingham Malaysia Jalan Broga Selangor Darul Ehsan Semenyih43500 Malaysia Department of Chemical Engineering Institut Teknologi Sepuluh Nopember Kampus ITS Keputih Surabaya60111 Indonesia

The separation and purification of butyric acid from an aqueous solution is of great importance in wide applications. Liquid-liquid extraction is a highly effective technique for the separation of an aqueous mixture with a low concentration of solute. The aim of this study was to isolate butyric acid from an aqueous solution using two biological buffers: 4-(2-hydroxyethyl)-1-piperazine-propanesulfonic acid (EPPS) and 3-(N)-morpholino-propanesulfonic acid (MOPS). Methyl isobutyl ketone (MIBK) was used as an extraction solvent for butyric acid separation. The quaternary liquid-liquid equilibrium (LLE) data for the water-butyric acid-MIBK-EPPS and water-butyric acid-MIBK-MOPS systems were determined under atmospheric pressure (P = 0.1 MPa) at 313.15 and 323.15 K, respectively. The extraction performance was evaluated by calculating the distribution coefficient and the separation factor from the LLE tie lines data. The influence of two types of different buffers on the LLE was studied at elevated temperatures. In this study, the molecule interactions among compounds investigated were assessed by σ-profiles analysis. The universal quasi-chemical (UNIQUAC), the nonrandom two-liquid (NRTL), and the conductor-like screening model for the segment activity coefficient (COSMO-SAC) were able to agree with the experimental LLE data. For the design of the extractor, the improved binary interaction parameters obtained by the improved separation procedure were required. © 2024 American Chemical Society.

关键词： Ketones

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Bio-waste derived hierarchical hydroxyapatite core–Shell manganese ferrite ceramic biomaterial: Structural, morphological characterization, and controlled drug release properties

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Ceramics International 2025年第16期51卷 22698-22706页

作者： Akila, Balasubramanian Kogularasu, Sakthivel Vasu, Dhanapal Sakthinathan, Subramanian Chen, Yung-Lung Chiu, Te-Wei Chang-Chien, Guo-Ping Department of Materials and Mineral Resources Engineering National Taipei University of Technology No. 1 Section 3 Chung-Hsiao East Road Taipei106 Taiwan Institute of Materials Science and Engineering National Taipei University of Technology No. 1 Section 3 Chung-Hsiao East Road Taipei106 Taiwan Center for Environmental Toxin and Emerging-Contaminant Research Cheng Shiu University Kaohsiung833301 Taiwan Super Micro Mass Research and Technology Center Cheng Shiu University Kaohsiung833301 Taiwan Division of Cardiology Department of Internal Medicine Kaohsiung Chang Gung Memorial Hospital College of Medicine Chang Gung University Kaohsiung833 Taiwan Graduate Institute of Clinical Medical Sciences College of Medicine Chang Gung University Taoyuan333 Taiwan Institute of Environmental Toxin and Emerging-Contaminant Research Cheng Shiu University Kaohsiung833301 Taiwan

The development of advanced drug delivery systems is essential for enhancing therapeutic efficacy and patient safety. This study introduces a novel MnFe2O4/hydroxyapatite (HAp) core-shell ceramic biomaterial synthesized for controlled and targeted drug delivery applications. Hydroxyapatite, sustainably derived from eggshells, was chosen for its biocompatibility, bioactivity, and pH-responsive degradation, while MnFe2O4 imparted superparamagnetic properties, enabling external magnetic manipulation and targeted delivery. The MnFe2O4 core was synthesized via a hydrothermal method and coated with an HAp shell. Comprehensive characterization confirmed the material's properties, including crystalline phases (XRD), functional groups (FT-IR), optical behavior (UV–Vis DRS), morphology (SEM and TEM), and elemental composition (EDX). In vitro studies with acetaminophen (ACP) revealed a biphasic release profile: an initial burst release due to surface desorption, followed by sustained release driven by diffusion through the porous HAp shell and its gradual degradation under physiological conditions. The magnetic properties of the MnFe2O4 core facilitated external manipulation, while the pH-responsive nature of the HAp shell enabled controlled release in acidic environments typical of pathological conditions. This multifunctional platform, combining magnetic targeting, biocompatibility, and pH-sensitive drug release, demonstrates significant potential for improving therapeutic outcomes and patient compliance in advanced drug delivery applications. © 2024 Elsevier Ltd and Techna Group S.r.l.

关键词： Shells (structures)

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Bayesian regularization knack-based intelligent networks for thermo-physical analysis of 3D MHD nanofluidic flow model over an exponential stretching surface

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European Physical Journal Plus 2023年第1期138卷 1-33页

作者： Awan, Saeed Ehsan Awais, Muhammad Raja, Muhammad Asif Zahoor Rehman, Saeed ur Shu, Chi-Min Department of Electrical and Computer Engineering COMSATS University Islamabad Attock Campus Attock 43600 Pakistan Department of Mathematics COMSATS University Islamabad Attock Campus Attock 43600 Pakistan Future Technology Research Center National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou 64002 Taiwan Department of Safety Health and Environmental Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou 64002 Taiwan

Artificial intelligence (AI) knacks are exploited broadly by the research community in the field of engineering and technology to enhance efficacy of the outputs for rapid development of business and society. Therefore, it looks promising to explore or investigate in the novel AI-based integrated numerical computing to study the solution dynamic of computational fluid mechanics problem of utmost significance. Boundary layer methodology is invoked for the mathematical modeling of fluidic system to study the heat and mass transport improvement of nanofluid with base water 3D-MHD flow model with an exponentially stretched surface involving three types of nanoparticles Fe₃O₄ (magnetite), Ag (silver) and C₁₄₀H₄₂O₂₀ (graphene oxide). The representative 3D PDEs for nanofluidic system are converted into equivalent nonlinear ODE-based system via suitable similarity transformation. The results of the three nanofluidic models are calculated by applying Adams numerical technique for influential outcomes of aggressing parameters including Hartmann number M, wall stretching ratio P, thermal radiation R_d and heat source/sink hs to observe the effecting profiles of temperature and velocity fields. The obtained numerical data are utilized for Bayesian regularization knack-based intelligent computing method to construct the networks for approximate solution dynamic of nanofluidic models. The worth and value of designed Bayesian regularization knack-based networks (BRKNs) is established by regression index measurements, error histogram studies and convergence curves with negligible level of mean square error (E-12 to E-10) for the exhaustive simulations. Graphical Abstract: [Figure not available: see fulltext.]. © 2023, The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature.

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Economic efficiency of processing biodegradable waste in dry anaerobic digestion and composting technologies under the polish market conditions

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Environment Protection engineering 2021年第3期43卷 269-286页

作者： Lewandowska, Daria Den Boer, Emilia Wroclaw University of Science and Technology Faculty of Environmental Engineering Section of Waste Technology and Land Remediation Wybrzeże Wyspiańskiego 27 Wroclaw50-370 Poland

An economic analysis of the dry anaerobic digestion (AD) in Poland operated with various input streams has been presented, ranging from the organic fraction of residual waste to biowaste from various sources. The shares of individual costs and revenues change significantly in these operation options. Sensitivity analyses, performed under assumption of four different market conditions showed that the profitability of AD plants is unpredictable. Assuming the current legal situation, the final profit or loss of the digestion technology strongly depends on the prices of energy. The final economic output for the anaerobic digestion was compared to the output of an aerobic stabilization process. © 2017 Technical University of Wroclaw. All rights reserved.

关键词： Profitability

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Bacterial composition associated with different traditions of salted and dried fish across countries

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Food Bioscience 2022年第6期50卷 320-326页

作者： Simon Bahrndorff Simon Menanteau-Ledouble Simone Stidsborg Niels O.G.Jørgensen Md Sazedul Hoque Jeppe Lund Nielsen Section of Bioscience and Engineering Department of Chemistry and BioscienceAalborg UniversityFredrik Bajers Vej 7HDK-9220Aalborg EastDenmark Section for Microbial Ecology and Biotechnology Department of Plant and Environmental SciencesUniversity of CopenhagenThorvaldsensvej 40DK-1871FrederiksbergDenmark Department of Fisheries Technology Patuakhali Science and Technology UniversityDumkiPatuakhali8602Bangladesh

Drying of fish to improve storage capabilities, often under hyperosmotic conditions, is a widespread and longstanding practice in many cultures throughout the world. Several drying practices are applied, and they often reflect a cultural influence. The purpose of drying is to preserve fish by lowering the availability of water to microorganisms. However, because drying of fish is globally widespread and drying procedures are very diverse, microbial communities occurring in the dried fish products might differ. In this study, 63 dried fish products, prepared from 8 different fish species, were collected from several parts of the world (Greenland, Iceland, Denmark, Norway, the Faroe Islands, Japan, and Bangladesh) and the microbiotas from these products were analysed and compared following amplification and sequencing of the V4-region of the 16S rRNA. Overall, the dominant bacterial taxa associated with the fish were the genera Photobacterium , Psychrobacteria , Vibrio , and Pseudomonas , but large differences occurred across samples with a strong influence of the country of origin (in particular samples from Bangladesh) and salinity of the fish products. Moreover, industrially processed filets were readily distinguishable from traditionally processed ones. In contrast, the fish species from which the filets were prepared appeared to have less effect. These results suggest that drying practices can have a strong effect on the microbiota of the resulting products. For several of the fish species tested, this constitutes the first report regarding the composition of the microbiota associated with the resulting fish products.

关键词： Microbiome Cod Preservation Fermentation Dried Salted

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Back-Up LED Lighting System with a Bidirectional SEPIC-ZETA Converter Based – A Computer Study

Back-Up LED Lighting System with a Bidirectional SEPIC-ZETA ...

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Junior Conference on Lighting (Lighting)

作者： Hristo Antchev Anton Andonov Dimitar Borisov Section of Electrical Engineering and Electronics University of Chemical Technology and Metallurgy Sofia Bulgaria Environmental engineering University of Chemical Technology and Metallurgy Sofia Bulgaria

In the present work, a back-up power supply system for LED lighting, including a DC voltage source, a bidirectional SEPIC-ZETA converter, an ultracapacitor and a control system is considered. The study was carried out by means of a computer simulation, showing operating time diagrams in the different modes. The operation of the control system and the functions of the regulators included in it are described.

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Measuring circular economy transition potential for industrial wastes

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Sustainable Production and Consumption 2023年 40卷 376-388页

作者： Yang, Chih-Kai Ma, Hwong-Wen Liu, Kun-Hsing Yuan, Mei-Hua Graduate Institute of Environmental Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Rd. Taipei106 Taiwan Industrial Technology Research Institute Green Energy and Environmental Research Laboratories Sustainable Environment Technology Division Green Materials and Analysis Department Rm. 316 Bldg.B No.360 Gaofa 2nd Rd. Guiren Dist. Tainan City71150 Taiwan Researh Center for Environmental Changes Academia Sinica No. 128 Section 2 Academia Rd Nangang District Taipei City115 Taiwan

The circular economy (CE) represents a paradigm shift in global production system, promoting a transition away from the linear model towards maximizing resource intensity and value addition. For industrial waste management, the transition has led to a shift from quantitative-based concept of "expansion of recycling industry" to the pursue of optimum resource recovery quality through "waste as resource". Studies have found that relying on the traditional indicator of "recycling rate" to evaluate WM performance can be "inaccurate, misleading and contributes to wrong policy decision". This limitation arises from the inadequacy of the quantity-based matric to assess the intricate interdisciplinary nature of CE transition. Despite substantial efforts to develop alternative assessment indices, there is currently no commonly recognized assessment index to replace "recycling rate" for evaluating industrial waste management performance, which is partly due to the lack of comprehensive WM statistics required for effective performance evaluation. To address this issue, this paper proposes the "circularity performance index (CPI), as a swift and pragmatic method for evaluating WM performance. The CPI overcomes the limitations of the recycling rate by measuring the relative efficiencies of resource recovery, taking into account environmental, social, and economic perspectives. By utilizing readily available general industrial waste statistics, the CPI provides an integrated assessment that incorporates both quantity and quality considerations. Furthermore, the CPI is applicable at various levels, from micro to macro, enabling comparisons across different sectors and regions. To demonstrate the practicality of CPI, a case study involving 27 manufacturing sectors is conducted to exemplify its applicability at national and sectoral levels. The findings reveals a weak correlation between the quantity and quality of resource recovery, providing empirical support for the limitation of

关键词： Sustainable development

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Novel nonlinear fractional order Parkinson's disease model for brain electrical activity rhythms: Intelligent adaptive Bayesian networks

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Chaos, Solitons and Fractals 2024年 180卷

作者： Mukhtar, Roshana Chang, Chuan-Yu Raja, Muhammad Asif Zahoor Chaudhary, Naveed Ishtiaq Shu, Chi-Min Graduate School of Engineering Science and Technology National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Computer Science and Information Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Future Technology Research Center National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Safety Health and Environmental Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan

In this study, a novel investigation in developing intelligent adaptive Bayesian networks (IABN) is carried out to solve the fractional order Parkinson's disease model (FOPDM) represented with a system of three fractional differential equations reflecting the brain's electrical activity rhythms at different cerebral cortex positions. The IABN are developed by using the competency of the multi-layer architecture of neural networks with backpropagation through Bayesian regularization optimization scheme. The reference dataset for IABN is created through Grunwald-Letnikov fractional derivative-based numerical solver for FOPDM in case of varying sensor locations on the cerebral cortex, as well as, considering different fractional orders in FOPDM. The proposed IABN is applied to the created datasets arbitrarily partitioned into training and testing sets by optimizing the fitness criterion based on mean square error (MSE) metric. The detailed analyses of the proposed IABN through extensive simulations and comparison with the reference numerical solutions of FOPDM in terms of MSE training/testing plots, absolute error, training/testing regression plots, and error histogram results, endorse the worth of the proposed intelligent scheme for different fractional orders. © 2024 Elsevier Ltd

关键词： Bayesian networks

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Realizing Global Citizen Solutions for Sustainable Development Goals: A Collaborative engineering Course Between Thai and Japanese Students 23

Realizing Global Citizen Solutions for Sustainable Developme...

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23rd International Symposium on Communications and Information Technologies, ISCIT 2024

作者： Sae-Jia, Thanachot Leelawat, Natt Tang, Jing Murakami, Rie Taoka, Yuki Ota, Eri Punyabukkana, Proadpran Chulalonkorn University Faculty of Engineering Department of Environmental Engineering Bangkok Thailand Chulalongkorn University Faculty of Engineering Department of Industrial Engineering Bangkok Thailand Chulalongkorn University Disaster and Risk Management Information Systems Research Unit Bangkok Thailand Graduate School of System Design and Management Keio University Yokohama Japan International School of Engineering Chulakongkorn University Faculty of Engineering Bangkok Thailand Global Education Section Center for Entrepreneurship Education Tokyo Institute of Technology Tokyo Japan School of Environment and Society Tokyo Institute of Technology Tokyo Japan Chulalongkorn University Faculty of Engineering Department of Computer Engineering Bangkok Thailand

ISBN: (纸本)9798350353952

One of the problems faced by engineering and science students is focusing solely on technical knowledge while needing more cultural context. In today's interconnected world, addressing global challenges necessitates collaborative efforts from individuals across nations. Accordingly, a joint course between Chulalongkorn University in Thailand and the Tokyo Institute of technology in Japan has been established. The recent theme of the course, 'Gamification towards Sustainable Development Goals (SDGs),' aimed to foster global citizenship and address SDGs through multicultural collaboration. This study examines the similarities and differences in problem identification between Thai and Japanese student groups participating in the course. Data was collected from discussions, presentations, and group assignments throughout the course. The findings indicate that while both groups share common concerns, such as waste management, language barriers, and transportation issues, their perspectives and proposed solutions are influenced by cultural characteristics. Thai students emphasized infrastructural inadequacies and local traditions, whereas Japanese students focused on efficiency and the impacts of tourism. The study highlights the importance of understanding cultural nuances in collaborative international projects to achieve effective and innovative solutions to global challenges. © 2024 IEEE.

关键词： Sustainable development goals

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