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Moh. Irma Sukarelawan
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INDONESIA
Indonesian Review of Physics (IRiP)
Published by Universitas Ahmad Dahlan
ISSN : 26213761     EISSN : 26212889     DOI : https://doi.org/10.12928/irip
Core Subject : Science, Education,
Astronomy Earth & Planetary Sciences Education Materials Science & Nanotechnology
This journal is continued version of Berkala Fisika Indonesia journal. The journal was published for the first time in 2008. The last published volume was 10 (1) 2018. The ISSN is 2085-0409 (printed version) and 2250-0465 (online version).
Arjuna Subject : Fisika dan Astronomi - Astronomi dan Astrofisika
Articles 134 Documents
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Students are Not Sure about Their Conceptual Understanding: A Comparative Study of the Level of Conceptual Understanding and the Level of Confidence Using Rasch Modeling Indratno, Toni Kus; Sukarelawan, Moh. Irma; Puspitasari, Ariati Dina; Soeharto, Soeharto
Indonesian Review of Physics Vol. 6 No. 2 (2023)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v6i2.6901

Abstract

Misconceiving fundamental physics concepts is a persistent challenge in education, hindering students' ability to grasp more advanced topics. This study aims to compare students' conceptual understanding and confidence levels using a 4-tier diagnostic instrument. Conducted as a survey involving 56 high school students in Yogyakarta, the research utilized a 4-tier diagnostic test covering topics of temperature and heat. Data were collected through Google Forms and analyzed using Excel and Winsteps 4.6.1 based on the Rasch Model. Data analysis involved coding, preparing raw data, and utilizing Wright maps combined with Logit Value of Person (LVP) for assessing students' conceptual understanding and confidence levels. Results indicated a significant inconsistency between students' conceptual understanding and their confidence, with many students displaying high confidence despite low understanding, and vice versa. This mismatch highlights the necessity for educational strategies that not only clarify concepts but also align students' confidence with their actual understanding. The study's implications suggest the need for more comprehensive diagnostic tools and targeted pedagogical interventions to enhance learning outcomes in physics education.
A Study of Tracker Software-assisted Spring Coupled Pendulum Oscillation Aprilia, Ananda; Dwandaru, Wipsar Sunu Brams
Indonesian Review of Physics Vol. 6 No. 2 (2023)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v6i2.7423

Abstract

Oscillatory motions are an essential part of our physical world. These motions need to be studied and learned by students. However, complicated oscillatory motions, e.g.: spring coupled pendulum, are rarely taught to students because their analytical solutions (if they exist) are complicated Here, we use the Tracker software to bridge between the actual coupled pendulum oscillation and its analytical solution. This study aimed to determine the period and frequency of Tracker software-assisted spring coupled pendulum oscillations. The displacement of the pendulum is divided into in-phase and out-of-phase motions. Data collection was carried out by recording the oscillatory motions up to 10 oscillations. The data were obtained from the pendulum position with respect to time. The data analysis techniques in this study used two methods, namely: i) Tracker software and ii) analytical calculations. The results showed that the period and frequency obtained via the Tracker software were in accordance with the analytical calculations. The periods of the in-phase motion and analytical calculation were 1.42 s and 1.54 s, respectively. The periods of the out-of-phase motions and analytical calculation were 0.7 s and 0.55 s, respectively. The frequencies of the in-phase motion and analytical calculation were 0.70 Hz and 0.65 Hz, respectively. The frequencies of the out-of-phase motions and analytical calculation were 1.50 Hz and 1.83 Hz, respectively. The uncertainty values of the results were 7% to 22%. Hence, the spring coupled pendulum oscillations became tractable and can be compared to the analytical solution.
Assessing the Efficacy of the UV Index in Predicting Surface UV Radiation: A Comprehensive Analysis Using Statistical and Machine Learning Methods Ervianto, Edy; Marpaung, Noveri Lysbetti; Raisal, Abu Yazid; Hutabarat, Sakti; Hassan, Rohana; Siagian , Ruben Cornelius; Nurhalim, Nurhalim; Amri, Rahyul
Indonesian Review of Physics Vol. 6 No. 2 (2023)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v6i2.8216

Abstract

The study investigated the relationship between the UV Index and measurements of ultraviolet A (UVA) and ultraviolet B (UVB) radiation to evaluate the effectiveness of the UV Index in predicting and understanding UV radiation at the surface. The implications of this study are significant for public health policies and UV protection strategies. This study used a variety of statistical analyses and modelling techniques, including ANOVA, Naive Bayes classification, decision trees, artificial neural networks, support vector machines (SVM), and k-means clustering, to examine relationships and predict UV Index values. ANOVA analysis showed a significant relationship between the UV Index and UVA and UVB measurements. Prediction models such as Naive Bayes classification, decision trees, and artificial neural networks showed variability in their accuracy. Notably, SVM showed a high degree of accuracy in predicting UV Index values, while k-means clustering effectively clustered the data based on similarities in UV Index and UV measurements. These findings confirm that the UV Index is a reliable indicator for predicting and understanding UV radiation levels at the Earth's surface. This research underscores the importance of developing more accurate and precise UV Index prediction models. Further investigation is essential to understand the temporal variations and environmental impacts on the UV Index, as well as the broader implications of UV exposure on public health. This study lays a strong foundation for the development of early warning systems and more effective UV protection strategies, ultimately improving public health outcomes and safety measures against UV radiation.
The Effect of Percentage Variation of Ketapang Fruit Biobrickets on Health Value and Combustion Rate Fadilah, Himmi Raudatul; Ahzan, Sukainil; Pangga, Dwi; Habibi, Habibi; Bilad, Muhammad Roil
Indonesian Review of Physics Vol. 6 No. 2 (2023)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v6i2.8871

Abstract

This study aims to determine the effect of variations in the percentage of Ketapang fruit (KF) bio briquette on calorific value and burning rate. This research is experimental in a physics laboratory with a literature review carried out in three stages, namely the preparation stage, the bio briquette manufacturing stage, and the bio briquette testing stage. The main ingredient used in the manufacture of bio briquettes is Ketapang fruit. The adhesive materials used were tapioca flour and sago flour with percentages of 10%, 12.5% ​​and 15%. The results showed that the calorific value of the following bio briquettes using the tapioca predicate included 5,139.45 Cal, 5,540.97 Cal, 5,922.42 Cal, and those using the sago predicate including 2,409.12 Cal, 3,653.83 Cal, 3,894.74 cal. The highest calorific value was in bio briquettes with tapioca adhesive type in the sample at 85%:15%. The burning rate of bio briquettes using tapioca glue included 1.98 gr/minute, 1.76 gr/minute, 1.62 gr/minute and those using sago glue included 2.62 gr/minute, 2.50 gr/minute, 2.31 gr/minute. The lowest burning rate value was in bio briquettes with the type of sago glue in the sample at 85%:15%. Based on the test results, it is known that the lower the percentage of keta pang fruit in the bio briquettes, the lower the burning rate, and the resulting calorific value increases.
Flood Hazard Mapping in Bandung Regency Based on Multi-Criteria Decision Analysis (MCDA) with AHP Method Putra, Riki Purnama; Agustina, Rena Denya; Susanti, Seni; Chusni, Muhammad Minan; Novitasari, Emiliya
Indonesian Review of Physics Vol. 6 No. 2 (2023)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v6i2.10386

Abstract

Flooding is a natural disaster that can harm various parties, both harming nature and also harming humans. Floods can certainly hinder various human activities, both social and economic. Various causes of flooding can be caused by two main factors, namely natural factors and human factors. The natural factors in question are caused by nature, such as high-intensity rain, while the human factors are caused by humans, such as massive development and lack of drainage and humans' bad attitude towards the environment. This research aims to determine the probability of flooding in the Bandung Regency area. The research method used uses the Analytical Hierarchy Process (AHP) method based on Multi Criteria Decision Analysis (MCDA) using eight main factors, namely; (1) NDVI; (2) TWI; (3) Land Use; (4) Rainfall; (5) Slopes; (6) Elevation; (7) Distance from Road; and (8) Distance from River. Then the probability results are formed into a flood risk map for the Bandung Regency area with validation carried out using the ROC curve. The results obtained are that there are four risk categories, including; (1) Low Risk; (2) Quite Risk; (3) High Risk; and (4) Extreme Risk. The Bandung Regency area near Bandung City has the most High Risk to Extreme Risk, while outside that area has an average of Low Risk to Quite Risk. In addition, the validation results by comparing the obtained maps with the flood maps that occurred in 2002–2022 obtained an average ROC curve percentage of 76.4%, and these results show that the flood risk hazard map for Bandung Regency is valid.
Review: Synthesis and Characterization of Dye Combination as Photosensitizer Dye-Sensitized Solar Cell Rusliani, Prima Fitri; Prima, Eka Cahya
Indonesian Review of Physics Vol. 7 No. 1 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v7i1.6708

Abstract

The need for energy that continues to increase has led to research processes to create renewable technologies. One of them is manufacturing a Dye-Sensitized Solar Cell with a photosensitizer derived from great natural ingredients, easy to extract and environmentally friendly. Although the resulting efficiency is not as excellent as synthetic materials, combining these natural pigments can expand the absorption area. The efficiency of a combination dye is more significant than a single dye. This review analyses the synthesis process and characterization of the dye combination as a DSSC photosensitizer starting from dye extraction and TiO2 deposition to characterization using various tools. In addition, there are results of research with dye combinations that can be prospects for further study.
Implantable Antennas for Biomedical Purposes: State-of-the-Art, Challenges, and Future Directions Amri, Muhammad Miftahul; Hisan, Urfa Khairatun; Sulisworo, Dwi
Indonesian Review of Physics Vol. 7 No. 1 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v7i1.9562

Abstract

This article provides a comprehensive review of implantable antennas in the context of their application within the biomedical field. Through a systematic exploration of cutting-edge developments and associated challenges, a thorough understanding of antenna design, performance considerations, and safety implications is obtained. The investigation thoroughly examines diverse antenna types, including planar, microstrip, fractal-geometry, and others, elucidating the design considerations that govern their suitability for a wide array of implantable medical devices (IMDs). Substrate and material choices are critical factors influencing antenna efficiency and biocompatibility. The utilization of available frequency bands is evaluated, highlighting the inherent tradeoffs that dictate their applicability in biomedical applications. Additionally, the promising domain of rectenna technology is explored for its potential in sustainable energy harvesting. The discourse on miniaturization techniques underscores their pivotal role in enabling the seamless integration of antennas within intricate implant structures. Safety aspects are paramount, encompassing metrics such as specific absorption range (SAR), maximum permissible exposure (MPE) limits, and thresholds for localized temperature changes. The intricate interplay between human body effects and antenna performance is briefly elaborated. Methodologies for thorough evaluation, spanning computer simulations, as well as experiments in in vivo and in vitro scenarios, are discussed for their pivotal role in iteratively refining antenna functionality.
Magnetic Field on A Square Helmholtz Coil Experiments Using Remote Laboratory Ishafit, Ishafit; Kustianingsih, Diah Ayu; Indratno, Toni Kus; Sukarelawan, Moh. Irma
Indonesian Review of Physics Vol. 7 No. 1 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v7i1.10609

Abstract

This research aims to explore the potential for innovation in physics teaching methods by utilizing remote laboratory technology for square Helmholtz coil magnetic field experiments. This research uses experiments with two variations of the distance between coils, accessed through an online portal-based remote laboratory, and magnetic field data taken using a Vernier magnetic field sensor. The results showed that the remote experiment produced data similar to the analytical predictions, with relative errors of 7.45% and 6.06% for the two different inter-coil distances. In conclusion, remote laboratories have great potential to support innovation in physics teaching methods. This research implies that remote experiments can be an efficient and accurate tool in online physics learning, providing a helpful practicum experience despite being conducted remotely.
The Mismatch between Knowledge and Belief: A Comparative Study of Students' Conceptual Understanding and Confidence in the Topic of Center of Gravity Irawan, Dani; Tohir, M. Anas; Wahab, Nadia Abdul
Indonesian Review of Physics Vol. 7 No. 1 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v7i1.11703

Abstract

This study explores the discrepancy between conceptual understanding and confidence levels among mechanical engineering students regarding the concept of the center of gravity. Despite its importance in physics, students frequently hold misconceptions about the center of gravity, particularly in irregular objects and composite shapes. Using a novel five-tier diagnostic instrument, this research measured students' understanding and confidence in their responses and reasons. The findings revealed that 12% of students had misconceptions and revised their personal thoughts as the most recurring error source. Furthermore, a sizeable group of students demonstrated an illusion of knowing something high wherein they were very sure but wrong! This should serve to prove the importance of teacher educational reforms, which support overturning misconceptions and correctness of levels of confidence of students to a corresponding realistic base. Knowledge and beliefs were further intertwined through the analysis of the Rasch model, in a bid to understand this relationship. The reported results also increase knowledge in physics instruction because they provide practical ways of minimizing misconceptions as well as an effective teaching profession, especially on the topic of center of gravity. This paper highlights how addressing both conceptual and psychological factors when students are learning can help them in physics education. By integrating psychological and conceptual dimensions into teaching strategies, educators can enhance students' grasp of foundational concepts like the center of gravity and improve their overall learning outcomes in physics and engineering contexts. This research contributes to the development of evidence-based instructional practices aimed at minimizing misconceptions and fostering deeper, more accurate learning.
Probability and Heisenberg Uncertainty of He+ at Quantum Numbers n≤3 Supriadi, Bambang; Afidah, Zidan; Arsita, Maya; Ni’mah, Simatun; Wardhany, Merry Khanza Kusuma; Hermansyah, Moh Dimas Feri
Indonesian Review of Physics Vol. 7 No. 1 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v7i1.11939

Abstract

The purpose of this study is to analyze the probability and uncertainty of electron linear momentum in with the Heisenberg uncertainty approach. Measurement of the position and momentum of atomic electrons is probabilistic. The probability and uncertainty of electron linear momentum are analysed analytically, and simulations of hydrogenic atoms' normalized radial wave function are performed.  they can be viewed as hydrogenic atoms with only one electron orbital. The probability and uncertainty of electron linear momentum in decrease with increasing values of the principal quantum number n ≤ 3. While the uncertainty of the electron position is increasing.  The results of this study are in accordance with the characteristics of position and linear momentum that are not commutable. The increase in the value of the main quantum number means that the electron's position against this is getting farther, and the speed in the orbital is getting smaller.

Page 13 of 14 | Total Record : 134

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