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Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika
Published by Universitas Sultan Ageng Tirtayasa
ISSN : 2442515X     EISSN : 25281976     DOI : http://dx.doi.org/10.30870/gravity.vxix
Core Subject : Science, Education,
Astronomy Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics
The focuses of the manuscript received in the Gravity journal is limited to the topic: Physics Education (Media, Educational Policy, Assessment, Learning Model) Theoretical Physics Material Physics Earth and Environmental Physics Astrophysics Medical Physics Computational Physics and Instrumentation
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 208 Documents
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Green Synthesis Ag Nanopartikel Berbasis Moringa Oleifera untuk Meningkatkan Absorbansi Pewarna Organik D205 pada Elektroda ZnO Nanorod Nurhamidah, Millah; Pujiarti, Herlin; Ma'arifah, Alfiatul; Diningsih, Ridha
Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Vol 11, No 1 (2025)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/gravity.v11i1.29430

Abstract

Green synthesis of AgNPs using Moringa Oleifera extract has many advantages, including low toxicity, relatively low cost, environmentally friendly materials, and the availability of easily obtainable materials. AgNPs also have the advantage of enhancing light absorption in the visible region due to the occurrence of an optical phenomenon known as Localized Surface Plasmon Resonance (LSPR). In this study, AgNPs were composited with the organic dye D205 to examine the effect of AgNPs composites on the increased absorbance of the organic dye D205 on ZnO nanorod electrodes and its influence on the material's band gap. The method used in this research is the green synthesis of AgNPs by reducing Moringa Oleifera extract with the reducer AgNO3, which produces AgNPs powder. Then, in this study, ZnO nanorod electrodes were synthesized using the hydrothermal method. After that, the ZnO nanorod electrode was immersed with the organic dye D205, which was composited with AgNPs. The variation in this study lies in the variation of AgNPs composites at 0 wt% and 10 wt%. Sample characterization was performed using XRD, SEM, and UV-Vis. This study shows that the crystal size of AgNPs is 34 nm, and the maximum diffraction peak is at 2θ = 32.16˚ on the hkl (122) plane. The SEM results show an average diameter of AgNPs of 85 nm, with EDX indicating an atomic weight of Ag compound of 79%. The absorbance values in this study from the variations of AgNPs composites and organic dyes at 0 wt% and 10 wt% were 321 nm and 325 nm, respectively. The Band gap values of the AgNPs and organic dye composite variations at 0 wt% and 10 wt% are 3.69 eV and 2.99 eV, respectively. The research results show that the AgNPs composite with the organic dye D205 successfully increased absorbance and reduced the material's band gap by about 0.7 eV. Thus, the AgNPs composite with the organic dye D205 has the potential to improve efficiency in ZnO nanorod-based DSSC applications.
A review on synthesis of magnetite nanoparticles and their applications in cancer therapy Sukma, Mairi; Dari, Ulan; D, Rahmad Agustyan; Silvini, Yaumil; Putri, Rahayu; Arivatussaqdiyah, Arivatussaqdiyah; Akram, Habibul
Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Vol 11, No 2 (2025)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/gravity.v11i2.35560

Abstract

The purpose of this literature review is to understand how to synthesize magnetite nanoparticle materials Fe₃O₄ using the coprecipitation method and to explore the utilization of magnetite nanoparticles as anti-cancer drugs. The data and/or information collected comes from both primary and secondary sources. Information regarding magnetite nanoparticles is limited to the last eight years, while information on cancer and human health is limited to the last ten years. In this study, the coprecipitation method used was surface adsorption at a molar ratio of 1:3 with the preparation of a 0.1 M solution consisting of ferrous (FeCl3.6H2O) and ferric (FeCl2.4H2O) ions with mechanical agitation at around 2000 rpm, heated at a temperature of 70°C, and stirring conditions increased up to 7500 rpm. The design of the anti-cancer drug preparation has bioavailability and biocompatibility within the human body. From the results of this literature review, it can be concluded that the synthesis of magnetite nanoparticles using the coprecipitation method can control the structural form and size of magnetite nanoparticles, and the drug will selectively attack cancer cells based on its cytotoxic properties.
Identifikasi Potensi Bahaya Gelombang Seismik Berdasarkan Parameter Dinamis Tanah di Kecamatan Selebar Nirvana, Aura; Mase, Lindung Zalbuin; Amri, Khairul; Misliniyati, Rena; Hardiansyah, Hardiansyah
Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Vol 11, No 2 (2025)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/gravity.v11i2.33471

Abstract

The Selebar District in Bengkulu City has a high level of earthquake vulnerability due to its location near the Indo-Australian and Eurasian plate subduction zone. This study began with a microtremor survey and earthquake modelling to analyse the seismic response of the soil. Modelling was conducted using the non-linear dynamic Pressure Dependent Hyperbolic (PDH) approach. This method models soil behaviour by considering changes in stiffness and damping due to variations in pressure and strain during an earthquake, thereby providing a more realistic representation of field conditions. The response analysis was conducted in one dimension and produced soil acceleration parameters, with Peak Ground Acceleration (PGA) values ranging from 0.47g to 0.75g. These results indicate a high earthquake potential in the study area. The acceleration spectrum of the input waves increased gradually until it reached its peak at a period of 0.2 seconds, covering the classification range of buildings from low to high. These findings provide essential input for earthquake-resistant infrastructure planning and the formulation of risk mitigation strategies in earthquake-prone areas, such as the Selebar District in Bengkulu City.
Development of STEM-Based Project Learning Tools Integrating Local Wisdom of the Gendang Melayu on the Topic of Sound Waves Musyaddad, Muhammad; Pathoni, Haerul; Alrizal, Alrizal
Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Vol 11, No 2 (2025)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/gravity.v11i2.34387

Abstract

This study aims to assess the feasibility of developing STEM-integrated Project-Based Learning (PjBL) tools incorporating the local wisdom of Gendang Melayu for the topic of sound waves. The development followed the 4D model and was limited to the development stage. In the define phase, several analyses were conducted, including initial-final, learner, task, concept, and learning objectives. The design phase structured the lesson plan (RPP) and student worksheet (LKPD) formats based on PjBL syntax and STEM components. During the development stage, the RPP and LKPD were validated by two expert lecturers and one physics teacher. The RPP scored 94.11% and 91.76%, while the LKPD scored 94% and 95%, all categorized as "very good." A student response questionnaire was also distributed to 23 learners, resulting in an overall average score of 86.6%. These results indicate that the developed tools are valid and practical for use in physics learning. The integration of local cultural elements through the Gendang Melayu project enhances contextual understanding, making physics learning more meaningful and engaging. Thus, the developed learning tools are considered feasible for implementation in sound wave instruction.
Characterization of thermal and material properties of solid-state composite eco-briket from domestic waste and coconut shells Aisiyah, Muktamar Cholifah; Bait, Jennifer Farihatul
Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Vol 11, No 2 (2025)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/gravity.v11i2.34542

Abstract

Municipal solid waste continues to pose a significant environmental and logistical challenge in rural regions of Indonesia, particularly due to limited landfill capacity and insufficient public engagement in waste management. This research aims to evaluate the effectiveness of solid-state composite eco-briquette technology as an alternative solution for optimizing waste handling at TPS 3R Lestari Desaku, Lamongan Regency. The study involved systematic waste segregation, carbonization of organic residues and coconut shells via controlled pyrolysis, and briquette fabrication using a 1:1 biochar blend and a 10% starch binder. Thermal and material characterizations were conducted following ASTM standard methods and benchmarked against Indonesian National Standards (SNI 01-6235-2000). The results revealed that the produced briquettes had high fixed carbon content (84%), low ash (1.72%) and moisture (6.15%), and a calorific value of 7411.76 cal/g, well above the SNI minimum threshold. These findings indicate that the briquettes possess strong thermal performance and structural integrity. The project also highlighted the potential of integrating physics-based waste valorization processes into community-level waste management systems. In conclusion, the adoption of eco-briquette technology demonstrates a promising path toward sustainable energy generation and supports broader circular economy objectives.
Effect of brain-based learning with e-comic on vocational students’ motivation and physics learning outcomes Afida, Nurul Aini; Maryani, Maryani; Nuraini, Lailatul
Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Vol 11, No 2 (2025)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/gravity.v11i2.34505

Abstract

The purpose of this study was to examine the effect of brain-based learning accompanied by e-comic media on the motivation and learning outcomes of vocational physics students in understanding energy and its changes. The type of research used was a true experimental study with a posttest-only control design. The research population consists of 10th-grade students at one vocational school in Mojokerto Regency. The measurement tools used in this study are a learning motivation questionnaire and a posttest, which will be statistically analyzed using the Kolmogorov-Smirnov test for normality and the independent samples t-test for hypothesis testing. The validity test results for the learning motivation instrument yielded a correlation coefficient of 0.497 and an r-table value of 0.282. The validity test results indicate that the learning motivation instrument is valid for the study. The normality test results for the learning motivation data and physics learning outcomes between the experimental and control classes showed a significant effect. The results of the T-test for learning outcomes in the experimental class were 0.111 and in the control class were 0.000. Therefore, it can be concluded that H0 is rejected and Ha is accepted, meaning there is a significant effect of the application of the brain-based learning model supported by e-comic media on the motivation and physics learning outcomes of vocational students.
Design and Construction of a Bipolar Disorder Detection Device Based on Anomalies in the Frequency of Conversational Sound Waves Using the Max9814 Sensor Badiyah, Rohmatul; Chasanah, Uswatun; Makrufah, Asmaul Lutfi; Widodo, Aris; Annas, Muhamad Azwar
Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Vol 11, No 2 (2025)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/gravity.v11i2.34826

Abstract

Bipolar disorder is a mental health condition that causes extremely dramatic mood swings, from very high (mania) to very low (depression). Physically, mood changes can be identified from variations in sound frequency. However, early detection of individuals suspected of having bipolar disorder remains a challenge due to the limited availability of tools and healthcare facilities. This research aims to design a bipolar disorder detection tool based on anomalies in the frequency of conversational sound waves using the MAX9814 sensor as a preventive measure for bipolar disorder, with the novelty of the research being its connection to IoT, enabling real-time monitoring of bipolar patients' emotional conditions. The system design uses Arduino Nano as the data processor, and ESP8266 module for IoT connectivity, with testing method conducted on ten respondents with five variations of emotion combinations. The testing method was performed on  10 people (5 men and 5 women) aged 20–40 years, who recited sentences combining variations of depression and mania. The research results show that the device is able to detect changes in voice frequency with an average error of 5% and an accuracy of 95%. The range of sound frequencies indicative of bipolar disorder is 190–355 Hz, with the following patterns: anger < 320 Hz, happiness < 300 Hz, sadness and fear > 240 Hz, especially if negative sounds are the highest. In individuals with bipolar disorder, voice frequencies can change suddenly by more than ±50 Hz within a single sentence. These findings prove that the developed tool has high sensitivity in detecting emotional changes based on voice frequency and can be used as a supporting instrument in the early detection of bipolar disorder efficiently and sustainably.
The implementation of guided inquiry learning model to improve students’ science process skills in physics subject Barus, Carolina Sri Athena; Sopacua, Venty
Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Vol 11, No 2 (2025)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/gravity.v11i2.35523

Abstract

Science process skills are a fundamental component of physics education, as the discipline is inherently inseparable from the application of scientific procedures. This study aimed to describe the improvement of students’ science process skills through the implementation of a guided inquiry learning model in physics instruction. A mixed-methods approach, combining qualitative and quantitative perspectives with descriptive analysis, was employed. The participants consisted of 29 students from grade XI Science-5 at Senior High School A in Ambon City. Data collection utilized both test and non-test instruments. The test instrument comprised 15 items designed to measure indicators of science process skills within the topic of material elasticity, while the non-test instrument was a questionnaire administered to evaluate students’ learning activities. Data analysis incorporated both quantitative and qualitative data, focusing on the comparison of science process skills before (pretest) and after (posttest) the intervention, complemented by learning activity assessments. The N-Gain analysis revealed a statistically significant improvement between pretest and posttest scores: 20.7% of students were categorized as high, 69% as moderate, and 10.3% as low. Learning activities related to identifying variables, formulating problems, developing hypotheses, and designing experiments were classified as active to highly active, while interpreting data was rated as moderately active. These findings demonstrate that the guided inquiry model effectively enhances science process skills in physics education.

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