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All Journal REKA RACANA Hipotenusa : Journal of Mathematical Society Movere Journal
Nur Ichsan
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Decision Sciences, Operations Research & Management Education Mathematics Other

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Uji Eksperimental Pengaruh Dimensi Lebar Rectifier Guide Vanes terhadap Kinerja Turbin Hidrokinetik Savonius Nur Ichsan; Dwi Anung Nindito; Raden Haryo Saputra
RekaRacana: Jurnal Teknil Sipil Vol 7, No 2: Juli 2021
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaracana.v7i2.96

Abstract

ABSTRAKKarakteristik blade sisi cekung turbin hidrokinetik Savonius yang memiliki nilai torsi negatif mengakibatkan kelemahan berupa efisiensi turbin yang relatif rendah, sehingga diperlukan sistem pengarah aliran berupa rectifier guide vane. Studi ini bertujuan membandingkan performa yang dihasilkan turbin Savonius tanpa guide vanes dan turbin Savonius menggunakan guide vanes dengan memvariasikan lebar rectifier L=Rt/4, L=Rt/2 dan L=3Rt/4, dimana Rt adalah jari-jari turbin. Metode pengujian dilakukan secara eksperimental di saluran prismatik dengan kecepatan aliran 0,111–0,1415 m/s. Hasil studi menunjukkan bahwa penambahan guide vanes dengan variasi lebar rectifier L=Rt/4, L=Rt/2 dan L=3Rt/4 masing-masing menghasilkan peningkatan torsi sebesar 29,9%; 33,3%; dan 36,3%. Turbin Savonius menggunakan guide vanes dengan lebar rectifier L=3Rt/4 menghasilkan coefficient of torque (Ct) dan coefficient of power (Cp) yang lebih tinggi dibandingkan variasi lebar rectifier (L) lainnya, sehingga kinerja turbin meningkat.Kata kunci: coefficient of power, hidrokinetik, savonius, rectifier guide vanes ABSTRACTThe characteristic of the concave side blade of the Savonius hydrokinetic turbine which has a negative torque value, it leads to the weakness in the form of a relatively low turbine efficiency, thus a flow steering system is needed in the form of a rectifier guide vane. The aim of this study was to compare the performance of the Savonius turbine without guide vanes and the Savonius turbine using guide vanes by varying the width of the rectifier L=Rt/4, L=Rt/2 dan L=3Rt/4, where Rt is the turbine radius. The test method was undertaken experimentally in a prismatic channel with a flow velocity of 0.111–0.1415 m/s. The results of the study pointed out that the addition of guide vanes with variations in the width of the rectifier was L=Rt/4, L=Rt/2 dan L=3Rt/4 and each of them had an increase in torque of 29.9%, 33.3% and 36.3%. The Savonius turbine used guide vanes with a rectifier width of L=3Rt/4 and it resulted a higher coefficient of torque (Ct) and coefficient of power (Cp) compared to other variations of rectifier width (L), thus, the performance of turbine increased.Keywords: coefficient of power, hydrokinetic, savonius, rectifier guide vanes
The Effectiveness of Think Pair Share Learning Model with a Problem Based Learning Approach Based on Students’ Self-efficacy Ahmad Mukhibin; Nur Ichsan
Hipotenusa : Journal of Mathematical Society Vol 1, No 1 (2019)
Publisher : Program Studi Tadris Matematika IAIN Salatiga

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (393.481 KB) | DOI: 10.18326/hipotenusa.v1i1.9-14

Abstract

The purpose of this study is to determine whether the think pair share learning model with a  problem based learning approach is effective based on students' self-efficacy. This research is a quantitative research in the form of quasi-experimental research using a pretest-posttest control group design. The sample of the study was the students of X MIPA class of MAN Salatiga in the academic year 2018/2019, the sample was determined using the Cluster Random Sampling technique. Data was collected using a self-efficacy questionnaire consisting of 20 statements. The results of the study show that: (1) the results of the independent sample t test mean students' self-efficacy obtained a value of 0.035, (2) the average N-Gain score of self-efficacy of students who learned by using the think pair share model with a problem based learning approach of 0.36 while the average N-Gain score of self-efficacy of students who get conventional learning is only 0.23. Thus it can be concluded that the think pair share learning model with a problem based learning approach is effective based on the self-efficacy of X MIPA class of MAN Salatiga students in the academic year 2018/2019.
Perceived Usefulness Of Generative AI dan Ethical AI Use Intention: Peran Mediasi Academic Integrity Awareness Di Perguruan Tinggi Sanapang, Gracela Marisa; Antralis, Moh Virgiawan; Wardana, Muh Dafa; Hidayat, Yusri; Nur Ichsan; Mursalim, Rahmat
Movere Journal Vol. 8 No. 1 (2026)
Publisher : Sekolah Tinggi Ilmu Ekonomi (STIE) Tri Dharma Nusantara Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53654/mv.v8i1.764

Abstract

The rapid diffusion of generative artificial intelligence (GenAI), such as ChatGPT, has reshaped students’ academic practices, primarily due to its perceived ability to enhance efficiency and learning productivity. Nevertheless, high perceived usefulness may also increase the risk of unethical academic use when students lack adequate awareness of academic integrity. Grounded in the Technology Acceptance Model (TAM) and an intention-based perspective, this study examines the effect of perceived usefulness of generative AI on students’ ethical AI use intention, with academic integrity awareness positioned as a mediating mechanism. A quantitative explanatory design was employed using an online survey targeting higher-education students who have used GenAI for academic purposes. Respondents were selected via purposive sampling. Data were collected through a five-point Likert-scale questionnaire and analyzed using SEM-PLS (SmartPLS), applying bootstrapping to test direct effects and mediation simultaneously. The results indicate that perceived usefulness positively and significantly predicts academic integrity awareness and ethical AI use intention. Academic integrity awareness also has a positive and significant effect on ethical AI use intention. Indirect-effect testing confirms a significant mediating role of academic integrity awareness in the relationship between perceived usefulness and ethical AI use intention, suggesting partial mediation. These findings imply that ethical GenAI use is not driven by perceived usefulness alone; it also depends on students’ internalized academic integrity awareness. Practically, higher-education institutions should strengthen ethical literacy, institutional policies, and governance frameworks for GenAI to ensure effective yet responsible adoption.
Co-Authors Ahmad Mukhibin Antralis, Moh Virgiawan Dwi Anung Nindito Hidayat, Yusri Mursalim, Rahmat Raden Haryo Saputra Sanapang, Gracela Marisa Wardana, Muh Dafa