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All Journal POSITRON Phi : Jurnal Pendidikan Fisika dan Terapan CIRCUIT: Jurnal Ilmiah Pendidikan Teknik Elektro Amina Jurnal Edunitro AL-KHAZINI: JURNAL PENDIDIKAN FISIKA Impulse: Journal of Research and Innovation in Physics Education
sri nengsih, sri
UIN Ar-Raniry Banda Aceh
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Physics Social Sciences Other

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Influence of Alkaline and Acidic Co-precipitation Media on Fe₃O₄/TiO₂ Photocatalyst Performance for the Photodegradation of Cypermethrin Nengsih, Sri; Rahman, Arief; Nur, Suardi
POSITRON Vol 15, No 1 (2025): Vol. 15 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v15i1.92902

Abstract

The persistence of pesticide residues such as cypermethrin in water bodies has raised environmental concerns, necessitating the development of effective photocatalytic materials for their degradation. This study examines the influence of solvent-assisted magnetite synthesis on the structural, magnetic, and photocatalytic properties of Fe₃O₄/TiO₂ composites for cypermethrin degradation under UV light with a focus on a comparative approach between alkaline and acidic synthesis routes, which has not been extensively reported. Fe₃O₄ was synthesized via co-precipitation using NaOH and HCl to assess the impact of solvent conditions. Xray diffraction confirmed the spinel-phase structure in both samples, while SEM showed finer and more uniform particles in the NaOH-derived sample. VSM analysis revealed that Fe₃O₄–HCl exhibited higher saturation magnetization (Ms = 57.98 emu/g) but lower coercivity (Hc = 0.0206 T) than Fe₃O₄–NaOH (Ms = 41.26 emu/g; Hc = 0.0241 T), indicating synthesis-dependent magnetic properties. UV–Vis analysis identified a cypermethrin absorption peak at 220 nm, which was used to monitor degradation. The Fe₃O₄–NaOH:TiO₂ composite showed superior photocatalytic activity (31.98% degradation in 90 minutes) compared to Fe₃O₄– HCl:TiO₂ (22.86%). Kinetic modeling using the pseudo first-order equation yielded a higher rate constant for Fe₃O₄-NaOH:TiO₂ (k = 0.00172 min⁻¹; R² = 0.769), while Fe₃O₄–HCl:TiO₂ showed slower kinetics but better linearity (k = 0.00030 min⁻¹; R² = 0.9999). These results suggest that alkaline synthesis enhances particle morphology and charge transfer efficiency, improving photocatalytic performance. Therefore, Fe₃O₄–NaOH:TiO₂ represents a promising candidate for cypermethrin remediation in wastewater treatment.
Implementation of the Internet of Things in the Design and Development of a Three-Phase Power Monitoring System Nengsih, Sri; Hidayati, Noura
Circuit: Jurnal Ilmiah Pendidikan Teknik Elektro Vol. 9 No. 2 (2025)
Publisher : PTE FTK UIN Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/hm94kk28

Abstract

This research aims to design an IoT-based three-phase electrical power monitoring system, evaluate its performance, and compare it with manual measurements. The system is developed by using microcontroller-based sensors to measure voltage, current, and power parameters in real-time. The methodology used is the 4D model, simplified into three stages: define, design, and development. In the define stage, issues related to the inefficiency of conventional monitoring were identified. The design stage involved creating a system diagram incorporating components such as the PZEM-004T sensor, ESP8266 microcontroller, LCD I2C 16x2 display, and the Blynk application for real-time data visualization. The development stage included system construction, testing, and validation by four media experts, yielding a validation score of 92%, indicating that the system is highly feasible for use. The results indicate that the IoT-based monitoring system effectively measures three-phase electrical parameters, with real-time data displayed on both an LCD screen and the Blynk application for remote access. Compared to conventional monitoring methods, the system offers greater efficiency and responsiveness. Overall, the research stated has successfully enhanced the accuracy and convenience of three-phase power monitoring.
Implementasi Model Problem Based Learning (PBL) Berbasis Eksperimen Untuk Meningkatkan Aktivitas Belajar Peserta Didik Pada Materi Getaran Di SMP Juniar Afrida; Nengsih, Sri; Saifiyaturramah, Saifiyaturramah
Al-Khazini Vol 2 No 1 (2022): April
Publisher : UIN Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (326.805 KB) | DOI: 10.24252/al-khazini.v2i1.30566

Abstract

The learning model becomes an important factor when the learning process is carried out because the learning model is a plan that helps based on the continuity of the learning process and can be implemented in accordance with the learning objectives. So it is necessary to apply an experimental-based problem besed learning (PBL) learning model to increase students’ learning activitieson vibration material. This study aims to (1) apply the experimental-based problem-based learning (PBL) learning model to improve student learning activities (2) find out the results of observations obtained through the experimental-based problem based learning, learning model. The research method used is the experimental research method (the Non-Equivalent Group Design). The results obtained from three observers are in the experimental class the average score for implementation =89%, Reaction =89% and activity = 84% with a very active category. While in the control class the average score for implementation =53% reaction 55% and activity 51% with the less active category. So it can be said that the application of the experimental-based learning model can improve the learning activities of students on vibration material at SMP Negeri 1 Simpang Ulim.
REVIEW LITERATUR: SINTESIS PASIR BESI MENJADI NANOPARTIKEL MAGNETIT MELALUI PENERAPAN METODE KOPRESIPITASI Nengsih, Sri
AMINA Vol. 3 No. 3 (2021): December 2021
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Proses sintesis nanopartikel magnetit (Fe3O4) dari pasir besi melalui metode kopresipitasi telah diteliti untuk berbagai proses variasinya. Adapun tujuan kajian ini agar menemukan tahapan proses sintesis yang sesuai untuk menghasilkan ukuran nanopartikel magnetit di bawah 100 nm. Pendekatan kualitatif dipilih dalam kajian ini untuk mendapatkan informasi selengkapnya. Sumber data yang digunakan adalah dari jurnal berskala nasional maupun jurnal internasional. Temuan yang didapatkan dari kajian ini adalah perlunya perlakuan awal pada bahan dasar pasir besi alami sebelum dilakukan proses sintesis untuk mendapatkan kemurnian pasir besi. Pada tahapan sintesis nanopartikel magnetit diperlukan kontrol pada jumlah komposisi bahan yang dicampurkan, kontrol proses sintesis dan lingkungan sekitarnya. Melalui kontrol tersebut diharapkan dapat ukuran nanopartikel magnetit yang homogen dan distribusi partikelnya lebih banyak serta terhindar dari aglomerasi partikel.
Solar Panel Light Intensity and Voltage Measurement System Using Atmega 328 Pane, Rangga Rio Pratama; Sri Nengsih, Sri Nengsih
JURNAL EDUNITRO Jurnal Pendidikan Teknik Elektro Vol. 4 No. 2 (2024): October Issue
Publisher : Department of Electrical Engineering Education, Faculty of Engineering, State University of Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53682/edunitro.v4i2.8623

Abstract

This research explores the development of a real-time measurement system for light intensity and voltage in solar panels. It utilizes the ATmega328 microcontroller with an INA219 sensor for voltage measurement, a BH1750 sensor for light intensity measurement, and a logger module. The objective of this research is to assist and reduce losses in the use of solar panels. The research method is a simplified version of the 4D model, reduced to 3D: define, design, and develop. This system is designed to accurately collect data directly from solar panels, with a recorded data error rate of 23%. The gathered data is stored via an SD card on the logger module and converted into CSV text format. Test results indicate that this system can measure accurately and store data in a readily accessible and processable format. ATmega328, as the system's core, allows accurate real-time monitoring of solar panel conditions while storing data in CSV format, facilitating further analysis. Therefore, this system can be a valuable tool for monitoring and enhancing the energy efficiency produced by solar panels.
Solar Panel Light Intensity and Voltage Measurement System Using Atmega328 Pane, Rangga Rio Pratama; Nengsih, Sri; Morsin, Marlia
Circuit: Jurnal Ilmiah Pendidikan Teknik Elektro Vol. 8 No. 2 (2024)
Publisher : PTE FTK UIN Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/crc.v8i2.22501

Abstract

The need for new renewable energy sources is growing because of several problems, such as high electricity costs, frequent power outages, and dependency on fossil fuels. It's critical to come up with solutions to this problem, like using solar power. Nonetheless, to guarantee a steady supply of energy, solar panels must be well controlled. The primary goal of this study was to create a system that would use an ATmega328 microcontroller, a logger module, and an INA219 voltage sensor, along with a BH1750 light intensity sensor, to detect the voltage and intensity of light on solar panels in real time. The study technique includes the steps of system definition, design, and development using a 4D approach that has been streamlined into 3D. The system's ability to make precise measurements and store data in a readily accessible and processable manner was demonstrated by the test results. Real-time solar panel state monitoring is made possible by the system's primary ATmega328 microprocessor, and data storage in CSV format enables easy analysis. In summary, this system was success for tracking and improving energy efficiency
Solar Panel Light Intensity and Voltage Measurement System Using Atmega 328 Pane, Rangga Rio Pratama; Sri Nengsih, Sri Nengsih
JURNAL EDUNITRO Jurnal Pendidikan Teknik Elektro Vol. 4 No. 2 (2024): October Issue
Publisher : Department of Electrical Engineering Education, Faculty of Engineering, State University of Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53682/edunitro.v4i2.8623

Abstract

This research explores the development of a real time measurement system for light intensity and voltage in solar panels It utilizes the ATmega328 microcontroller with an INA219 sensor for voltage measurement a BH1750 sensor for light intensity measurement and a logger module The objective of this research is to assist and reduce losses in the use of solar panels The research method is a simplified version of the 4D model reduced to 3D: define design and develop This system is designed to accurately collect data directly from solar panels with a recorded data error rate of 23 The gathered data is stored via an SD card on the logger module and converted into CSV text format Test results indicate that this system can measure accurately and store data in a readily accessible and processable format ATmega328 as the system s core allows accurate real time monitoring of solar panel conditions while storing data in CSV format facilitating further analysis Therefore this system can be a valuable tool for monitoring and enhancing the energy efficiency produced by solar panels < p>
Design and Implementation of a Portable Air Quality Monitoring Device Using Nova Fitness SDS011 Sensor Technology in Urban Areas Sirait, Naza Fahrul; Nengsih, Sri
Jurnal Phi: Kurnal Pendidikan Fisika & Terapan Vol 12 No 2 (2026)
Publisher : Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/p-jpft.v12i2.32124

Abstract

This study presents the design and implementation of a portable air-quality monitoring device based on the Nova Fitness SDS011 sensor to measure PM2.5 concentrations. The system integrates a microcontroller-based processing unit with real-time data display and audio warning features. Device performance was evaluated by calibrating against a reference instrument (BAM 1020, BMKG), yielding an average measurement error of 2.43%. In addition, validation by media experts indicated a high feasibility level of 95%, confirming the device’s suitability for practical use. Field testing conducted in several urban locations revealed significant variations in PM2.5 concentration, influenced by factors such as traffic density, industrial activity, and population distribution. The results demonstrate that the proposed device provides a reliable, low-cost, and portable solution for real-time PM2.5 monitoring in urban environments. This study contributes to the development of easy-to-use tools for monitoring air quality in support of environmental awareness and educational applications.
Co-Authors Abdul Wahid, Mulyadi Arief Rahman Arusman Bayak Miko, Yeni Ependi, Irpan Faizurrahmany El Faridy, Zia Febrianti, Susi Haryanti, Yuyun Dwi Hidayati, Noura Ida Meutiawati Juniar Afrida Morsin, Marlia Nur Fadillah, Nur Pane, Rangga Rio Pratama Rangga Rio Pratama Pane saifiyaturrahmah, saifiyaturrahmah Saifiyaturramah, Saifiyaturramah Sirait, Naza Fahrul Suardi Nur Yonanda, Devi Afriyuni