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6th International Seminar on mathematics, Science, and Computer Science Education, MSCEIS 2018

作者： Jannati, E.D. Setiawan, A. Siahaan, P. Rochman, C. Susanti, D. Samantha, Y. Mechanical Engineering Study Program Majalengka University Majalengka Indonesia Department of Mechanical Engineering Education Universitas Pendidikan Indonesia Bandung Indonesia Department of Physics Education Universitas Pendidikan Indonesia Bandung Indonesia Department of Physics Education UIN Sunan Gunung Djati Bandung Indonesia Department of Informatics Engineering Majalengka University Majalengka Indonesia

This study aims to study the development of laboratory learning media on the concept of fluids. The method used in this study is the research and development (R & D) method of implementation up to step 7, namely: (1) literature study, (2) needs analysis, (3) design of virtual lab learning media, (4) development of lab learning media virtual, (5) validation, (6) product testing, (7) product revision. Virtual laboratory learning media, have gone through a phase validation test by two material experts and one media expert who showed that laboratory learning media on fluid materials are feasible to be applied in learning. the results of sponsored pretest and posttest for students showed a significant increase. Recommended to be applied in a virtual learning laboratory is suitable to be applied in the Faculty of engineering, Majalengka University. © 2019 IOP Publishing Ltd.

关键词： Laboratories

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Phosphotungstic acid (H₃PW₁₂O₄₀)-loaded onto titanium porous montmorillonite heterostructure for the effective enhanced kinetics and thermodynamic conversion of citronellal

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Case Studies in Chemical and Environmental engineering 2025年 11卷

作者： Fatimah, Is Yahya, Amri Rubiyanto, Dwiarso Sagadevan, Suresh Oh, Won-Chun Doong, Ruey-an Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Islam Indonesia Kampus Terpadu UII Jl. Kaliurang Km 14 Sleman Yogyakarta Indonesia Nanomaterials and Sustainable Chemistry Research Centre Chemistry Laboratory Universitas Islam Indonesia Kampus Terpadu UII Jl. Kaliurang Km 14 Sleman Yogyakarta Indonesia Chemistry Study Program Nusa Bangsa University JL. KH Sholeh Iskandar KM.4 Tanah Sareal Bogor 16166 Indonesia Nanotechnology & Catalysis Research Centre University of Malaya Kuala Lumpur 50603 Malaysia Department of Advanced Materials Science and Engineering Hanseo University Seosan-si 356-706 South Korea Institute of Analytical and Environmental Sciences National Tsing Hua University 101 Sec 2 Kuang Fu Road Hsinchu 30013 Taiwan

In present work, nanocomposite of phosphotungstic acid (H3PW12O40)-loaded onto titanium-porous clay heterostructure (PTA/Ti–PCH) was prepared using natural montmorillonite as parent material (Mnt). Characterization o... 详细信息

In present work, nanocomposite of phosphotungstic acid (H₃PW₁₂O₄₀)-loaded onto titanium-porous clay heterostructure (PTA/Ti–PCH) was prepared using natural montmorillonite as parent material (Mnt). Characterization of the material was performed using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy-energy dispersive X-ray fluorescence, transmission electron microscopy, Fourier-Transform Infra-Red spectroscopy, and solid acidity measurement. The material was examined as superacid catalyst in citronellal conversion into isopulegol by varied reaction conditions. Kinetics and thermodynamic studies of catalyzed reaction revealed the role of increased total surface acidity and the Lewis to Brønsted to enhance the reaction conversion and selectivity. Thermodynamic study demonstrated a lower activation energy of the reaction over PTA/Ti–PCH compared to Ti–PCH. A 100 % conversion was exhibited by the sample during 120 min of the reaction at 90°C, and the sample also demonstrated activity at room temperature. Reusability of the sample was expressed by a maintained conversion until 5th cycle. Conclusively, the prepared material showed a potency to be developed for heterogeneously acid-catalyzed organic reactions. © 2025 The Authors

关键词： Acid Citronellal Clay-based nanocomposite Heterogeneous catalysis Porous clay heterostructure

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Design strategies and willingness to pay for circular economy service policies in sustainable tourism

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Environmental Challenges 2025年 18卷

作者： Suhardono, Sapta Phan, Thi Thanh Thuy Lee, Chun-Hung Suryawan, I Wayan Koko Environmental Sciences Study Program Faculty of Mathematics and Natural Sciences Universitas Sebelas Maret Surakarta 57126 Indonesia Faculty of Natural Resources & Environment Dong Nai Campus Vietnam National University of Forestry Bien Hoa Dong Nai 810000 Viet Nam Department of Natural Resources and Environmental Studies College of Environmental Studies and Oceanography National Dong Hwa University Taiwan Hualien 97401 Taiwan Department of Environmental Engineering Faculty of Infrastructure Planning Universitas Pertamina Jalan Sinabung II Jakarta Terusan Simprug 12220 Indonesia Center for Environmental Solution (CVISION) Universitas Pertamina Jalan Sinabung II Terusan Simprug Jakarta 12220 Indonesia Center for Interdisciplinary Research on Ecology and Sustainability College of Environmental Studies and Oceanography National Dong Hwa University Taiwan Hualien 97401 Taiwan

The transition towards a circular economy within the tourism industry is increasingly seen as essential to achieving sustainable development goals. This study explores the relationships between various design strategies, tourists' willingness to pay (WTP) for sustainable practices, and their participation in circular economy activities. Using Structural Equation Modeling (SEM) to analyze data collected from 640 tourists in Bali, the research identifies the critical factors that influence tourists' engagement with sustainability. The findings reveal that design strategies focused on longevity, serviceability, reusability, and material recovery significantly enhance WTP for sustainable practices. In turn, WTP is shown to be a key driver of participation in circular economy activities, such as purchasing recycled items and green purchasing behaviors. However, barriers such as cost concerns, lack of awareness, and limited incentives pose significant challenges to widespread adoption. © 2025 The Authors

关键词： Circular economy Design strategies Structural equation modeling Sustainable tourism Willingness to pay

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Selecting for positive responses to knock outs in boolean networks 1

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14th International Workshop on Artificial Life and Evolutionary Computation, WIVACE 2019

作者： Villani, Marco Magrì, Salvatore Roli, Andrea Serra, Roberto Department of Physics Informatics and Mathematics University of Modena and Reggio Emilia Modena Italy European Centre for Living Technology Venice Italy Department of Computer Science and Engineering University of Bologna Cesena Italy Institute for Advanced Study University of Amsterdam Amsterdam Netherlands

ISBN: (数字)9783030450168

ISBN: (纸本)9783030450151

Random Boolean networks are a widely acknowledged model for cell dynamics. Previous studies have shown the possibility of achieving Boolean Networks (BN) with given characteristics by means of evolutionary techniques. In this work we show that it is possible to evolve BNs exhibiting more positive than negative reactions to knock-out stresses. It is also interesting to observe that in the observed runs (i) the evolutionary processes can guide the BNs toward different dynamic regimes, depending on their internal structure and that (ii) the BNs forced to evolve by maintaining a critical dynamical regime achieve better results than those that do not have this characteristic;this observation supports the idea that criticality may be beneficial to an evolving population of dynamical systems. © Springer Nature Switzerland AG 2020.

关键词： Dynamical systems

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Observing Generator Performance by Finite Element Analysis Considering Coil Numbers 5

Observing Generator Performance by Finite Element Analysis C...

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5th International Conference on Technology and Policy in Energy and Electric Power, ICT-PEP 2023

作者： Habibi, Muhammad Afnan Ali Irfani, Mochamad Farhan Gumilar, Langlang Kusumawardana, Arya Aripriharta Baskoro, Angger Universitas Negeri Malang Study Program of Power Plant Engineering Technology Malang Indonesia Universitas Negeri Malang Department of Electrical Engineering and Informatics Malang Indonesia National Yang Ming Chiao Tung University Dept. Electrical Engineering and Computer Sciences Hsinchu Taiwan

ISBN: (纸本)9798350369717

This paper conducts a comprehensive analysis of electrical generator performance using Finite Element Analysis (FEA), with a specific emphasis on the role of coil numbers in influencing generator efficiency and functionality. In the context of modern energy systems, where efficient power generation is paramount, this research aims to elucidate the relationship between the number of coils within a generator and its overall performance, including power output and electromagnetic behavior. Through systematic FEA simulations that vary coil numbers while keeping other parameters constant, this study provides valuable insights into the trade-offs associated with increased coil numbers and enhanced efficiency. These findings have significant implications for optimizing generator designs across various applications, from renewable energy systems to industrial power generation, ultimately advancing our understanding of generator dynamics and contributing to more sustainable and efficient power generation technologies. © 2023 IEEE.

关键词： Finite element method

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Carrying Javanese Local Wisdom in Mathematical Model 1

Carrying Javanese Local Wisdom in Mathematical Model

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1st International Conference on Computer, Science, engineering and Technology, ICComSET 2018

作者： Prabowo, A. Mamat, M. Sukono Ngadiman Department of Mathematics Faculty of Mathematics and Natural Sciences Universitas Jenderal Soedirman Indonesia Faculty of Informatics and Computing Universiti Sultan Zainal Abidin Terengganu Darul Iman Kuala Terengganu Malaysia Department of Mathematics Faculty of Mathematics and Natural Sciences Universitas Padjadjaran West-Java Indonesia Physical Health and Recreation Education Study Program Faculty of Health Sciences Universitas Jenderal Soedirman Purwokerto Central-Java Indonesia

People of Cikakak Traditional Village, Wangon District, Banyumas Regency, Central-Java Province are known as the followers of Islam Aboge (Alif Rebo Wage). Their religious holidays such as the beginning of fasting month (Ramadan) and Eid al-Fitr are determined based on the rules they have been using so far, namely Month Code or Sandi Bulan and Year Code or Sandi Tahun. This research is conducted using literature study method and field study in the form of interview with respondents. This research aims at producing a mathematical model which matches the function of these two codes. The results obtained are five mathematical equations to determine the names of year, saptawara and pancawara days for the 1st day of each month, and saptawara and pancawara days for other dates. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Functions

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Prediction of Consumer Purchase Intention on Green Product

Prediction of Consumer Purchase Intention on Green Product

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2021 International Seminar on Application for Technology of Information and Communication, iSemantic 2021

作者： Hariyadi, Guruh Taufan Purwanto Isnanto, R Rizal Wibowo, Adi Warsito, Budi Universitas Diponegoro Doctoral Program of Information Systems Semarang Indonesia Universitas Diponegoro Faculty of Engineering Department of Chemical Engineering Semarang Indonesia Universitas Diponegoro Faculty of Engineerig Department of Computer Engineering Semarang Indonesia Universitas Diponegoro Faculty of Science and Mathematics Departement of Informatics Semarang Indonesia

ISBN: (纸本)9781665428040

Education to the public on green products has been widely carried out. Consumers who buy green products can be profiled by segmenting green consumers. In green marketing, consumer education on sustainable consumption is increasingly needed in recent years due to the problem of environmental pollution which poses a serious threat to the world population. Concern for the environment is an important topic in most countries, and individuals also study environmental issues. Individuals or groups of individuals who are 'ecologically aware' are also referred to as 'green consumers.' Such consumers are considered to have more concern for the environment. This study examined the predictions on the effect of the Green Perceived Value variables consisting of functional, conditional, and social values on the purchase intention of green consumers. It also tested the comparisons with other classification models. The models used in this research were Random Forest, Decision Tree, and Neural Network.. © 2021 IEEE.

关键词： Consumer behavior

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An Investigation of Ultrashort Pulses Propagation in Atmospheric Turbulence of FSO Communications 9

An Investigation of Ultrashort Pulses Propagation in Atmosph...

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9th International Conference on Electrical engineering, Computer Science and informatics, EECSI 2022

作者： Darusalam, Ucuk Priambodo, Purnomo Sidi Universitas Nasional Informatics Study Program Universitas Siber Asia of IEEE Photonics Society Informatics Faculty of Information and Communications Technology Jakarta Indonesia Universitas Indonesia IEEE Photonics Society Faculty Engineering Department of Electrical Engineering Depok Indonesia

ISBN: (数字)9786239213565

ISBN: (纸本)9781665470438

The atmospheric turbulence as the natural media of optical propagation for the free-space optical (FSO) communications is the great advantage to reach flexible connection and low-cost deployment but also is the major problem as well. Since, the phenomena of optical propagation in the atmosphere are random process, an optical signal is induced that produces severe effects to the performance. Thus, a method to reach best performance of FSO must be developed intensively to reduce the severe effects of atmospheric turbulence. One of the solutions to reduce those aforementioned effects is an ultrashort pulse implemented in FSO to modulate frequency carrier as the signal of optical propagation. In this paper, an investigation of an ultrashort pulse was performed through simulation. An ultrashort pulse has a great chance to be implemented in FSO since it has shorter width of pulse duration than a short pulse. An ultrashort pulse is generated using optical second harmonic pulse generator that produce a pulse at 50 fs of width. Based on the results of simulation, the ultrashort pulses showing better performance of FSO than short pulses have. © 2022 Institute of Advanced engineering and Science (IAES).

关键词： atmospheric turbulence free-space optical communications optical propagation optical scintillation temporal broadening turbulence effects ultrashort pulses

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Improvement in speech to text for bahasa Indonesia through homophone impairment training

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Journal of Computers (Taiwan) 2017年第5期28卷 1-10页

作者： Areni, Intan Sari Indrabayu Bustamin, Anugrayani Department of Electrical Engineering Electrical Study Program Universitas Hasanuddin Indonesia Department of Electrical Engineering Informatics Study Program Universitas Hasanuddin Indonesia Department of Electrical Engineering Universitas Hasanuddin Indonesia Research Group of Artificial Intelligence Multimedia Processing Universitas Hasanuddin Makassar Indonesia

In this research, an approach for increasing accuracy in speech to text application is done using Mel Frequency Cepstral Coefficient (MFCC) trained by Backpropagation Neural Network (BPNN). A set of Bahasa Indonesia homophones data speech is used for training and validation. The record is taken from 6 native adults comprising 3 males and 3 females. Working in 16 KHz sampling mode, the data is stored in WAV format. A confusion matrix is used to validate the system with and without homophone locking learning. A significant improvement is observed from the experiment. The percentage of accuracy is increased from 53.33 to 93.4 from male samples. From females' records, the increment is even higher. The accuracy percentage has risen from 36.8 to 93.33.

关键词： Neural networks

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Scoreboard wireless universal based on microcontroller 2

Scoreboard wireless universal based on microcontroller

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2nd Nommensen International Conference on Technology and engineering, NICTE 2018

作者： Hutauruk, Sindak Siagian, Pandapotan Sianturi, Libianko Department of Electrical Engineering University of HKBP University 4 A Sutomo Street Medan Indonesia Institut Teknologi Del Faculty of Informatics and Electrical Engineering Computer Network Management Study Program Jl. Sisingamangaraja Sitoluama Toba Samosir Sumatera Utara22381 Indonesia

The scoreboard is designed and made for a universal use that can be used in matches in some sports such as basketball, futsal, ping pong, badminton, and others. The scoreboard is designed and made based on the needs of several sports in the Student Activity Unit at HKBP Nommensen University which can be easily moved. Scores displayed on the scoreboard is not only the result of the game but also displayed time in the countdown. This scoreboard can be operated by using a cable and can also without using a cable by using a mobile phone through communication using bluetooth. This scoreboard is based on a microcontroller and uses backup power through rechargeable batteries that can be automatically charged. In trials in several games, this tool works well with a few drawbacks in case of a match that takes more than 100 minutes because the time display can only display a maximum time of 99 minutes. © Published under licence by IOP Publishing Ltd.

关键词： Microcontrollers

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