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INDONESIA
Science and Physics Education Journal (SPEJ)
Published by Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi
ISSN : 26140195     EISSN : 25982567     DOI : -
Core Subject : Education,
Education
Arjuna Subject : -
Articles 96 Documents
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Inovasi Komprehensif Komposit Berbasis Polimer dan Serat Daur Ulang untuk Infrastruktur  Berketahanan Tinggi dan Berkelanjutan : ”Sebuah Tinjauan” Sri Bintang Faisal; Muhamad Fitri
Science and Physics Education Journal (SPEJ) Vol. 9 No. 2 (2026): SPEJ (Science and Physics Education Journal)
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/q5hhyx96

Abstract

Permintaan yang terus meningkat akan material konstruksi yang ramah lingkungan, berdaya tahan tinggi, dan berkinerja mekanis unggul telah mendorong pergeseran paradigma dalam teknik mesin. Penelitian ini menyajikan sintesis komprehensif dari inovasi material komposit berbasis polimer dan serat, yang mengintegrasikan aspek keberlanjutan, kinerja struktural, dan pemodelan prediktif. Penelitian ini mengadopsi pendekatan Ekonomi Sirkular yang kuat, memvalidasi penggunaan limbah industri dan konsumen sebagai pengisi fungsional. Pemanfaatan limbah, seperti busa polistirena daur ulang, serbuk perlit, serbuk karet ban bekas (tyre crumbs), dan agregat beton daur ulang (Recycled Aggregate - RA), telah terbukti efektif dalam memproduksi Komposit Polimer-Semen (PCC) dan Beton Polimer (PC) yang ringan namun berkinerja tinggi. Secara khusus, komposit yang mengandung Polistirena/Serbuk Karet menunjukkan peningkatan signifikan dalam kekuatan tekan (hingga 22.2%), sementara PC dengan RA menunjukkan kuat tekan yang luar biasa (hingga 96 MPa) karena optimasi mikrostruktur dan pembentukan lapisan resin pelindung. Selain itu, pemanfaatan serat alami yang berkelanjutan, seperti serat daun kurma dan serat rami (Hemp Fiber), telah divalidasi sebagai alternatif penguatan yang efektif dan ramah lingkungan. Optimalisasi komposisi material, termasuk rasio volume resin dan perlakuan permukaan pada pengisi (misalnya serbuk gergaji), lebih lanjut memastikan peningkatan stabilitas dan sifat mekanis material.Dari sisi aplikasi struktural, material komposit menunjukkan peran penting dalam perkuatan dan pengembangan elemen baru. Penggunaan Carbon Fiber-Reinforced Polymer (CFRP), termasuk aplikasi prategang, terbukti sangat efektif untuk perbaikan balok beton bertulang yang mengalami korosi dan penguatan balok komposit baja-beton. Selain itu, elemen struktural inovatif seperti Tiang Komposit Tabung FRP berisi Beton (CFFT) telah diuji kinerjanya di bawah beban lateral siklik, dan Komposit Kayu-Beton (TCC) dengan matriks epoksi memberikan ikatan geser yang unggul dibandingkan matriks lain. Terakhir, pemanfaatan model prediktif canggih, seperti algoritma Extreme Gradient Boosting (XGBoost), telah memungkinkan perkiraan sifat mekanis dengan akurasi tinggi (R² hingga 0.981), memfasilitasi desain material yang didorong oleh data. Secara kolektif, temuan ini mengukuhkan komposit berbasis polimer dan serat sebagai solusi material masa depan, secara simultan mendukung keberlanjutan melalui daur ulang limbah skala besar dan memastikan ketahanan mekanis luar biasa dari infrastruktur sipil.   Kata Kunci: Komposit Berbasis Polimer, Konstruksi Berkelanjutan, Daur Ulang Limbah, Kuat Tekan, Perkuatan CFRP, Agregat Daur Ulang, Beton Serat (FRP)
Strategi Total Productive Maintenance (TPM) untuk Meningkatkan Kinerja Mesin PKS PT Tri Cahaya Sawit Uni Pratama Pebrina Br Tarigan; Imran Yustin Sihombing; Raihan Syah
Science and Physics Education Journal (SPEJ) Vol. 9 No. 2 (2026): SPEJ (Science and Physics Education Journal)
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/sr99tj77

Abstract

Abstract: This study aims to analyze the implementation of TPM strategies in improving machine performance in Palm Oil Mills (PKS). Problems that often occur in PKS are high machine downtime, low equipment effectiveness, and operational disruptions that impact productivity decline. The methods used in this study include identifying machine failures, measuring Overall Equipment Effectiveness (OEE), and implementing TPM pillars such as autonomous maintenance, planned maintenance, and focused improvement. The results show that the implementation of TPM can improve machine reliability, reduce the frequency of breakdowns, and significantly increase the OEE value. In addition, operator involvement in routine maintenance activities also increases production process efficiency and reduces maintenance costs. Thus, the TPM strategy can be an effective solution in improving machine performance and operational productivity in Palm Oil Mills.   Keywords: Total Productive Maintenance, TPM, Overall Equipment Effectiveness, Machine Performance, Palm Oil Mill.
Analisis Pengaruh Spoiler terhadap Aerodinamika Mobil Jenis Urban dengan Simulasi Computational Fluid Dynamics Achmad Nadhomul Faidh Al Qodir; Alviani Hesthi Permata Ningtyas
Science and Physics Education Journal (SPEJ) Vol. 9 No. 2 (2026): SPEJ (Science and Physics Education Journal)
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/wbn15b42

Abstract

This study aims to analyze the effect of spoiler size variations on the Coefficient of Drag (CD) and Coefficient of Lift (CL), as well as to investigate the characteristics of velocity, pressure, and turbulent kinetic energy contours in an urban-type vehicle under various airflow velocities. The research employed a Computational Fluid Dynamics (CFD) simulation approach using ANSYS Workbench software, while the urban-type vehicle model was designed using Autodesk Inventor. Three spoiler dimensions were evaluated, namely 2200 × 500 mm, 2200 × 600 mm, and 2200 × 700 mm, under airflow velocities of 60 km/h, 80 km/h, and 100 km/h. The simulation results indicate that spoiler size variations significantly affect the aerodynamic characteristics of the vehicle. The 2200 × 500 mm and 2200 × 600 mm spoilers exhibited better aerodynamic performance by generating downforce, which contributes to improved vehicle stability. In contrast, the 2200 × 700 mm spoiler produced an increase in Lift Force that may reduce vehicle stability. Furthermore, contour analysis revealed the formation of wake regions and an increase in turbulence intensity behind the vehicle as the spoiler size and airflow velocity increased. Therefore, selecting an appropriate spoiler dimension can improve the aerodynamic performance and stability of urban-type vehicles.   Keywords: Aerodynamics, Computational Fluid Dynamics (CFD), Coefficient of Drag (CD), Coefficient of Lift (CL), Spoiler, Urban-Type Vehicle.  
Analisis Kualitas Daya Sebagai Indikator Keandalan dan Keselamatan Operasional Sistem Distribusi Listrik pada Gedung Bertingkat Muhammad Rivel Zebertavio; Priyo Adi Sesotyo; Fahrudin Ahmad
Science and Physics Education Journal (SPEJ) Vol. 9 No. 2 (2026): SPEJ (Science and Physics Education Journal)
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/jb0p6524

Abstract

Abstract:  This study aims to evaluate power quality and analyze its impact on the reliability of electrical distribution systems in a high-rise building. The study employed a quantitative descriptive method through field measurements using a Power Quality Analyzer PEL 103 Chauvin Arnoux installed on the distribution panels of ten floors. The observed parameters included voltage, voltage unbalance, current unbalance, power factor, and total harmonic distortion of voltage (THDv) and current (THDi). The results indicate that the voltage level (229.18–235.02 V), voltage unbalance (0.31–1.17%), power factor (0.86–0.99), and THDv (<5%) comply with IEC 61000, SNI IEC 61000, Permen ESDM No. 04 of 2009, and IEEE 519-2014/2022 standards. However, current unbalance exceeded the permissible limit of 20% on seven floors, and THDi values on several floors exceeded 15%, indicating the presence of nonlinear loads. It can be concluded that the electrical distribution system of the high-rise building exhibits good voltage stability; however, load balancing among phases and harmonic mitigation measures are necessary to maintain the long-term reliability and safety of the electrical installation.   Keywords: Electrical Distribution, Harmonics, High-Rise Building, Power Factor, Power Quality.
Penentuan Nilai Tekanan Udara Luar Menggunakan Pendekatan Gas Van Der Waals pada Percobaan Hukum Boyle Defrianto Pratama; Ratu Fenny Muldiani; Kunlestiowati Fenny Hadiningrum; Yunita Citra Dewi
Science and Physics Education Journal (SPEJ) Vol. 9 No. 1 (2025): Science and Physics Education Journal (SPEJ)
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/18gc0335

Abstract

Abstract: This study aims to obtain more accurate external air pressure values ​​by applying the Van der Waals equation of state for a Boyle's Law experiment. Pressure data taken from a column of air trapped in a U-tube were analyzed using the ideal gas model and the Van der Waals model. The research findings indicate that the Van der Waals model provides external air pressure values ​​closer to the actual value with a relative error of 0.40%, compared to the ideal gas model, which has a relative error of 10.19%. Therefore, the use of the Van der Waals equation is recommended to improve the accuracy of the Boyle's Law experiment. Based on the research results, it can be concluded that the Van der Waals equation provides a higher level of accuracy than the ideal gas model in determining external air pressure in the Boyle's Law experiment.   Keywords: Boyle's Law, Ideal Gas, Van der Waals Equation, Atmospheric Pressure, Laboratory Experiment.
Pengembangan E-Modul Fisika Berbasis Discovery Learning pada Materi Energi Terbarukan untuk Meningkatkan Berpikir Kritis Siswa Reno Nabila; Endang Lovisia; Sulistiyono Sulistiyono
Science and Physics Education Journal (SPEJ) Vol. 8 No. 2 (2025): SPEJ (Science and Physic Education Journal)
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/8jath435

Abstract

Abstract: This research was carried out with the aim of producing a Physics E-Modul Based on Discovery Learning to improve the critical thinking of class The research carried out is Research and Development (R&D) research using a 4-D approach which includes the definition stage, design stage, development stage and disseminate stage. The subjects of this research are students. class X.5 of SMA Negeri 1 Muara Beliti. Data collection techniques use interviews, observation, questionnaires and test questions. Based on the feasibility test analysis of the E-Module media given by the three experts, namely language, material and media experts, it shows that the physics E-Modul media meets the Very Good criteria, and the critical thinking of class X5 students at SMA N 1 Muara Beliti after using the physics-based E-module Discovery Learning based on the Ngain test is 0.32 in the medium category. Thus, it can be concluded that the Discovery Learning-based physics E-module developed by researchers can improve students' critical thinking in the physics learning process in class.   Keywords: E-Modul, Discovery Learning, 4-D, Critical Thinking  

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