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Increasing the efficiency of photovoltaic streetlight through microalgal fuel cell Spirulina sp. series circuit prototypes

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AIP Conference Proceedings 2023年第1期2634卷

作者： Fami Israyusnita Nefertiti Riyan Putri Hasanah Indri Febriani Facchur Rozy Dwi Septian Indra Kurniawan Saputra 1Department of Biology Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Malang Indonesia 2Department of Physics Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Malang Indonesia 3Department of Electrical Engineering Faculty of Engineering Universitas Negeri Malang Malang Indonesia 4Biotechnology Study Program Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Malang Indonesia

Climate change is one of the various problems faced by various countries. Many sectors that contribute to climate change, electricity, and heat production were identified as the main contributors to CO2 emissions worldwide. On the other hand, Spirulina sp. potential for becoming power generator because it has good photosynthetic efficiency as anolyte biophotovoltaic devices. This research aims to test the effectiveness of photovoltaic using Spirulina sp. and develop Spirulina sp. as streetlights. The prototype uses 21 pairs of Spirulina sp. microalgal fuel cells as generator, based on voltage measurements using 100 ml anolyte and 500 ml catholyte which produces voltage value 405 mV. Using 21 pairs of series circuits, the voltage value obtained is 17.6 V. This prototype is equipped with aeration system to support the life of Spirulina sp. and equipped with LDR sensor for automation refers to the presence/absence of sunlight. Based on the results, there are challenges in the form of prototype sizes that are not suitable for streetlights in general, so further studies are needed to implement and commercial photovoltaic streetlights based on Spirulina sp. microalgal fuel cells.

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The effect of organic acid hydrolysis on the properties of nanocellulose from edamame husk (Glycine max (L.) merill)

Case Studies in Chemical and Environmental Engineering

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Case Studies in Chemical and Environmental engineering 2025年 11卷

作者： Wahyudi, Muhammad Sapto Holilah Bahruji, Hasliza Prasetyoko, Didik Asranudin Pratama, Agus Wedi Indriani, Dina Wahyu Suryanegara, Lisman Faradilla, RH Fitri Mahardika, Melbi Wardani, Ratih Kusuma Piluharto, Bambang Knight, Victor Feizal Norrrahim, Mohd Nor Faiz Research Center for Biomass and Bioproducts National Research and Innovation Agency of Indonesia (BRIN) Cibinong Indonesia Research Collaboration Center for Nanocellulose BRIN-Andalas University Padang Indonesia Study Program of Chemistry Faculty of Science and Technology UIN Sunan Kalijaga Yogyakarta Indonesia Centre of Advanced Material and Energy Sciences Universiti Brunei Darussalam Jl. Tungku Link BE 1410 Brunei Darussalam Department of Chemistry Faculty of Science and Data Analytics Institut Teknologi Sepuluh Nopember Surabaya Indonesia Research Center for Applied Microbiology National Research and Innovation Agency (BRIN) Cibinong Indonesia Department of Biosystem Engineering Faculty of Agricultural Technology Universitas Brawijaya Jalan Veteran Malang Indonesia Department of Food Science and Technology Faculty of Agriculture Universitas Halu Oleo Kendari Indonesia Academy Pharmacy of Surabaya Ketintang Gayungan Surabaya 60231 Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences University of Jember Jember Indonesia Research Center for Chemical Defence Defence Research Institute Universiti Pertahanan Nasional Malaysia Kem Sungai Besi Kuala Lumpur 57000 Malaysia

The increasing demand for sustainable materials has highlighted nanocellulose as a promising candidate due to its exceptional mechanical strength, thermal stability, and superior barrier properties. These attributes enable its application in diverse fields, including packaging, biomedical devices, and nanocomposites. This study investigates the valorization of edamame bean husks, a byproduct of the globally consumed legume snack, as a sustainable feedstock for nanocellulose production. Cellulose was extracted from the husks via delignification and bleaching, followed by a green and facile acid hydrolysis method employing organic acids (maleic acid, lactic acid, citric acid, and formic acid) to produce nanocellulose. The resulting nanocellulose exhibited a fibrillar morphology with particle sizes ranging from 7.59 to 17.51 nm, depending on the acid used. X-ray diffraction analysis revealed a crystallinity index ranging from 63.49 % to 67.24 %. Notably, acid hydrolysis significantly enhanced the thermal stability of the nanocellulose compared to both the raw husk and isolated cellulose. These findings demonstrate the potential of edamame agricultural waste as a valuable resource for sustainable and eco-friendly nanocellulose production, contributing to a circular bioeconomy. © 2025 The Authors

关键词： Characterization Edamame husk waste Green synthesis Nanocellulose Organic acids

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Magnetic mineral concentration and microcrystalline characteristics of Fe-rich coastal sand from North Sulawesi

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AIP Conference Proceedings 2023年第1期2694卷

作者： Gerald Tamuntuan Ping A. Angmalisang Adey Tanauma Seni H. Tongkukut Hanny F. Sangian Agnes T. Mandagi Silvia J. Fajar Dolfie P. Pandara Guntur Pasau Ferdy Ferdy As’ari As’ari Department of Physics Sam Ratulangi University Manado 95115 Indonesia Marine Science Study Program Sam Ratulangi University Manado 95115 Indonesia Department of Civil Engineering Sam Ratulangi University Manado 95115 Indonesia Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung 40132 Indonesia

Magnetic mineral concentration, especially from the iron oxide class, is one of the important indicators in determining the potential iron sand natural resources. In this study, the magnetic measurement as well as X-ray spectroscopy analysis have been carried out in order to determine the concentration and microcrystalline characteristics of iron sand originating from four locations in the coastal area of North Sulawesi which are Lolan, Lalow, Hais, and Minanga. Magnetic properties study through measurement of saturation isothermal remanent magnetization (SIRM) confirmed by oxide composition obtained from X-ray fluorescence (XRF) observation showed that the iron sand sample from Lolan had the highest concentration of iron oxide minerals followed by samples from Hais, Lalow, and Minanga respectively. The percentage of iron oxide at these sites varied between 60.33 – 76.70 wt.%, implying that it was relatively competitive compared to the samples from other localities in Indonesia. Findings related to variations in crystal size and degree of crystallinity are closely related to the source and mechanism of iron sand formation at each study site.

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Optically Transparent Electrodes for Ultrasensitive Real-Time Detection of Dopamine in Brain-on-A-Chip Applications

SSRN

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SSRN 2024年

作者： Rantataro, Samuel Hlushchuk, Irena Kang, Yi-Ning Gomez-Giro, Gemma Wester, Niklas Berghe, Pieter Vanden Schwamborn, Jens Christian Airavaara, Mikko Laurila, Tomi Department of Electrical Engineering and Automation Aalto University Maarintie 8 Espoo02150 Finland Division of Pharmacology and Pharmacotherapy Drug Research Program Faculty of Pharmacy University of Helsinki Viikinkaari 5E Helsinki00014 Finland Department of Chronic Diseases KU Leuven ON1 Herestraat 4 Leuven3000 Belgium University of Luxembourg 6 avenue du Swing BelvauxL-4367 Luxembourg Neuroscience Center HiLife University of Helsinki Biomedicum 1 Haartmaninkatu 8 Helsinki00014 Finland Department of Chemistry and Materials Science Aalto University Kemistintie 1 Espoo02150 Finland

Brain-on-a-chip models are rapidly being adopted in disease modeling and drug discovery,however characterization of the brain model condition often requires both the use of microscopy techniques and evaluation of neuronal activity. Although electrochemical techniques can offer the required selectivity between neuronal subtypes but also sensitivity in simple buffer solutions, a complete loss of electrode functionality is often observed when the brain model has been cultured directly on the electrode material or when recordings are performed in the culture *** prepared optically transparent sensors capable of accurately measuring dopamine at nanomolar concentrations in real-time. Furthermore, we displayed the recording of both spontaneous and stimulated release of dopamine from primary mouse midbrain culture for the first time, as measured inside the culture medium. Due to excellent optical transparency, we were able to perform fluorescence microscopy but also live-cell Ca2+ imaging through the ***, biocompatibility of the sensors was validated by various different techniques and by using highly sensitive in vitro brain-on-a-chip cultures. © 2024, The Authors. All rights reserved.

关键词： Carbon nanotubes

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Automotive engineering chemistry module: Exploring acid base and electrochemistry topic in vehicle context 1

Automotive engineering chemistry module: Exploring acid base...

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1st International Conference of Chemistry 2018, ICCHEM 2018

作者： Febiana, H. Partana, C.F. Wiyarsi, A. Sulistyo, B. Study Program of Chemistry Education Faculty of Mathematics and Natural Sciences Universitas Negeri Yogyakarta Indonesia Chemistry Education Department Faculty of Mathematics and Natural Science Universitas Negeri Yogyakarta Indonesia Automotive Engineering Education Department Faculty of Engineering Universitas Negeri Yogyakarta Indonesia

The research purposed to analyze the characteristics of chemistry module on acid-base and electrochemistry topic based on vehicle context, to analyze the feasibility of module according to chemistry learning experts and to analyze the response of chemistry teachers and students of Automotive engineering program (AEP) about this module. This research using mixed methods and exploratory model design. The data collected from expert validation sheets also teachers and students response questionnaire. Technique of data analysis begins by converting qualitative data into quantitative data using Likert scales. Furthermore, the total and average score of each component can be determined from the quantitative data. The result of the average scores were converted into qualitative feasibility criteria according to the rating category. The product of the development was a chemistry module on acid-base and electrochemistry topic based on vehicle context for students in AEP. The experts considered feasibility of the module. This module had assessed by 5 teachers and 10 students. The module assessed by teachers showed a very good response while the module assessed by students showed a good response. Therefore, this module is feasible and can be used as a learning resource for students of AEP to enhance quality of chemistry learning. © Published under licence by IOP Publishing Ltd.

关键词： Students

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Chemistry in context: The development of hydrocarbon chemistry and petroleum module based on vehicle case 1

Chemistry in context: The development of hydrocarbon chemist...

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1st International Conference of Chemistry 2018, ICCHEM 2018

作者： Febrianto Wiyarsi, A. Partana, C.F. Sulistyo, B. Study Program of Chemistry Education Faculty of Mathematics and Natural Sciences Universitas Negeri Yogyakarta Indonesia Department of Chemistry Education Faculty of Mathematics and Natural Science Universitas Negeri Yogyakarta Indonesia Automotive Engineering Education Department Faculty of Engineering Universitas Negeri Yogyakarta Indonesia

This study aims to analyze the characteristic, feasibility, teachers' and students' responses of Hydrocarbon Chemistry and Petroleum (HCP) module based on the context of vehicle case on automotive engineering. Exploratory mixed method has been employed in this research. The research procedures used four steps including qualitative, development, quantitative, and interpretation step. The instruments used to collect the data consisting the three questionnaires, one open questionnaire to obtain the validation and two close questionnaires to collect the teachers and students' responses toward the HCP module. HCP module based on the context of vehicle case on automotive engineering program was yielded as a result of this reseach. The characteristic of research product was integrating between chemistry and automotive subject based on basic competence of curriculum and integrated by vehicle context in first chapter, concept map, activities, examples, and exercise. A group of experts consisting two lectures were confirmed that the HCP module has a correct chemistry content. A very good category was given as the response of the teacher. Moreover, the students response were very interest toward the HCP module. The students and the tachers could be utilize the HCP module as learning sources reference to gain a succesfull chemistry learning. © Published under licence by IOP Publishing Ltd.

关键词： Vehicles

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Building data centers using Network Attached Storage (NAS) and Microprocessor Operating Systems

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IOP Conference Series: Materials science and engineering 2021年第1期1088卷

作者： Titi Andriani Muhammad Hidayatullah Dekky Saputra Shinta Esabella G Gunawan Electrical Engineering Department Faculty of Engineering Universitas Teknologi Sumbawa Informatics Department Faculty of Engineering Universitas Teknologi Sumbawa Physics Education Study Program Faculty of Teacher Training and Education Universitas Mataram

Computer Laboratory of the University of Technology Sumbawa still does not have a Data Center, in the process of learning and teaching experiencing several obstacles one of which is the difficulty in sharing files between computers. The research objective is to build a Data Center at the Computer Laboratory of the University of Technology Sumbawa with the aim of facilitating practicum participants in sharing files between computer system devices. The method used in this research is the network development method Prepare, Plan, design, Implement, Operate, Optimize (PPDIOO). The results of NAS tests on different devices give results that are file access connections via wireless and LAN can run well and by producing Data Centers at the Computer Laboratory of the University of Technology Sumbawa can facilitate the process of storing cheap and efficient data.

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Complex refractive index sensor based on GeSbSe microring resonator

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Optics & Laser Technology 2025年 190卷

作者： Xiaolong Liu Yujiao Tao Xinxin Zhao Yingchun Wu Lan Li Rongping Wang Wei Zhang Faculty of Electrical Engineering and Computer Science Ningbo University Ningbo 315211 China Zhejiang Key Laboratory of Advanced Optical Functional Materials and Devices Ningbo 315211 China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University Hangzhou 310030 China Institute of Advanced Technology Westlake Institute for Advanced Study Hangzhou 310024 China

This study presents and validates a microring sensor with a complex refractive index (RI) utilizing Ge 28 Sb 12 Se 60 (GeSbSe) materials. The chalcogenide glass (ChG) sensor is created through electron beam lithography (EBL) and inductively coupled plasma (ICP) etching techniques. By analyzing the transmission spectrum, a chalcogenide microring device achieving a Q -factor of 3.44 × 10 4 is demonstrated. The research further elucidates the complex RI sensitivity of the GeSbSe microring sensor while maintaining the real part of the complex RI of the cladding solution almost constant. The experimentation involves testing various concentrations of heavy water solutions, revealing a sensitivity of 138 nm/RIU for the real part, an intrinsic detection limit of 3.33 × 10 −4 , and a sensitivity of 341 nm/RIU for the imaginary part. These findings contribute to the implementation of complex RI ternary component sensing applications.

关键词： Electron beam lithography

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Meteorological data implications modeling on evapotranspiration variability in arid and semi-arid zones in Saudi Arabia using hybrid metaheuristic

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Scientific Reports 2025年第1期15卷 1-22页

作者： Noureddine, Oulad Naoui Mohamed, Sekkoum El Amine, Cherif Alzaed, Ali Gedfew, Meseret Abeje Ghoneim, Sherif S. M. Hussein, Enas E. Materials Energy Systems Technology and Environment Laboratory Department of Hydraulic and Civil Engineering University Ghardaia Bounoura Algeria Department of Civil Engineering Faculty of Civil Engineering and Architecture Amar Telidji University P. O. Box 37.G Laghouat 03000 Algeria Water Management and Treatment Laboratory University of Science and Technology of Oran Mohamed Boudiaf B.P. 1505 El M’Naouer Oran Algeria Architectural Engineering Program - Civil Engineering Department Faculty of Engineering Taif University Taif 21944 Saudi Arabia Department of Civil Engineering Faculty of Technology Debre Markos University P. O. Box 269 Debre Markos Ethiopia Department of Electrical Engineering College of Engineering Taif University Taif 21944 Saudi Arabia Water Management Research Institute National Water Research Center Shubra El-Kheima 13411 Egypt

This work is unique and contributes new knowledge to the field whereas it involves introducing a new method based on coupling two or three stochastic models, analyzing new data represented by drought and flooding risk relationship, and addressing a previously unexplored research question: Can we make a decision regarding future evapotranspiration-flooding risk relationship? In this paper, the Bat algorithm (BAT) with the Newton Method (NM), Bird Swarm Algorithm (BSA), Genetic Algorithm (GA), and Chicken Swarm Optimization Algorithm (CSO) are used as a hybrid model in arid and semi-arid zones in Saudi Arabia as well as for modeling rainfall, temperature, and solar radiation implications on evapotranspiration variability. Coupling between aridity and evapotranspiration over a long time can create flooding risks. This holistic modeling aims to reduce flooding risks and ensure the desired decision. Several models were employed to simulate some basins’ Potential and Actual evapotranspiration as case studies. The meteorological inputs of the hybrid models were calibrated and validated with metric evaluation for input and output of evapotranspiration, respectively. The results suggest that the application of a hybrid model can improve the accuracy of evapotranspiration simulations in terms of statistical parameters, whereas BAT–GA–NM reduced MAPE from 38.88 to 4.16% for Mekkah and from 14.94 to 2.04% for Medina and NSCE from − 0.17 to 0.97 for Mekkah and from 0.82 to 0.99%. Those parameters will provide a better understanding of evapotranspiration processes in watersheds and valuable information for early warnings of flooding risks. © The Author(s) 2025.

关键词： Evapotranspiration Hybrid metaheuristic Modeling Rainfall Solar radiation data Temperature

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Response to Comment on (Novel two-dimensional porous graphitic carbon nitride C6N7 monolayer: A First-principle calculations [Appl. Phys. Lett. 2021, 119, 142102])

arXiv

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arXiv 2022年

作者： Bafekry, Asadollah Faraji, Mehrdad Fadlallah, Mohamed M. Sarsari, I. Abdolhosseini Jappor, Hamad R. Fazeli, Sara Ghergherehchi, Mitra Department of Radiation Application Shahid Beheshti University Tehran Iran Micro and Nanotechnology Graduate Program TOBB University of Economics and Technology Sogutozu Caddesi No 43 Sogutozu Ankara06560 Turkey Department of Physics Faculty of Science Benha University Benha13518 Egypt Department of Physics Isfahan University of Technology Isfahan84156-83111 Iran Department of Physics College of Education for Pure Sciences University of Babylon Hilla Iraq Department of Material Science and Engineering Sharif University of Technology PO Box 11155-9466 Tehran Iran Department of Electrical and Computer Engineering Sungkyunkwan University Suwon16419 Korea Republic of

Recently, reported a comments on the our paper [Appl. Phys. Lett. 119, 142102(2021)]. With our response, the APL journal rejected their non scientificcomments. There are some ambiguities about their claim: 1-They can check thephonon dispersion of their structure to see ZA out-of-plane mode. 2-They reportthe uniaxial stress-strain responses in Fig 2., which is unrelated to ourpaper. For a more helpful understanding of the mechanical properties of thenovel C6N7 monolayer, they can publish a paper. 3-They mentioned: Using the DFTmethod and with assuming a thickness of 3.35 A for the C6N7 monolayer based ongraphene thickness. Why did they choose this thickness while we know our C6N7monolayer is at without buckling? The distance of ZA out-of-plane movement ofions in C6N7 is different from Graphene. © 2022, CC BY.

关键词： Monolayers

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