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Siti Utari Rahayu
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Journal of Technomaterial Physics
Published by TALENTA PUBLISHER
ISSN : 26560747     EISSN : 26560755     DOI : https://doi.org/10.32734/jotp
Core Subject : Science, Engineering,
Astronomy Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
Journal of Technomaterial Physics (JoTP) is a peer-review national journal that is published twice a year, in February and August. JoTP provides an open access policy for the writer and free publication charge. Due to its open access policy, JoTP serves online publication and a fast review process. The scope of this journal are: 1. Theoretical Physics 2. Applied Physics 3. Material Physics 4. Computational Physics and Machine Learning 5. Experimental Physics 6. Nuclear Physics and Particle Physics 7. Biophysics and Medical Physics 8. Geophysics 9. Energy and Energy Conversion 10. Advanced Materials (photonics, nanomaterial and nanotechnology) 11. Electronics and Electrical Engineering 12. Metrology JoTP receives an original article with the maximal length of 10 pages and provides an open access policy for the writers and free publication charge.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 10 Documents
 1 
Search results for , issue "Vol. 7 No. 2 (2025): Journal of Technomaterial Physics" : 10 Documents clear
Design and Analysis of an Integrated IoT Electronic Menu Based on The MERN (MongoDB, Express.js, React.js, and Node.js) Stack Website Syaipuddin Muda Pane; Nasution, Tulus Ikhsan
Journal of Technomaterial Physics Vol. 7 No. 2 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i2.22434

Abstract

Restaurants often rely on traditional order-taking processes that are prone to delays, miscommunication, and human error. Earlier IoT-based electronic menus already introduced better order handling, but are limited by unidirectional communication and the scalability constraints of PHP + MySQL architectures. This research investigated the design and analysis of an MERN (MongoDB, Express.js, React.js, and Node.js) stack–based electronic menu, integrated with an Arduino Mega 2560 and ESP8266 module, to enable two-way communication between the client and server. The device was tested under varying Wi-Fi signal conditions, taking into account environmental factors such as distance, humidity, and obstacles. Results showed that Wi-Fi signal strength decreases linearly with distance and is attenuated by 6-7 dBm when passing through a concrete barrier, while high humidity (up to 95%) results in an additional 11-12 dBm reduction. Web application testing demonstrated the reliable data transmission of the MERN stack, which shows a striking difference compared to PHP + MySQL, outperforming it in scalability and processing speed. These results showed the advantages of MERN in supporting an interactive, scalable, and responsive electronic menu. Although measurements were based on averaged trials without complete statistical analysis, a promising approach was demonstrated in improving efficiency and reliability in restaurant environments.
Induction Cookers Use a Hybrid System Powered by Recycled Batteries BANUREA, RAHMADHANI; Fathurrahman, Fathurrahman; Floranda, Abdul
Journal of Technomaterial Physics Vol. 7 No. 2 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i2.22642

Abstract

Traditional stoves cause fires due to problems and accidents. Induction stoves mitigate this concern by reducing the likelihood of flames and the risk of fire.  Induction cookers do not produce flames. The power supply, combined with a recycled 12V 16850 Lithium-Ion battery and a bridge diode, constitutes the primary voltage source that provides 200W of power to activate the ZVS module. Then, connect the ACS712 sensor as a current sensor. The ATMega328 microcontroller controls the system, which is programmed to read and respond to sensor inputs. The sensor results are displayed on the I2C LCD as soon as the ZVS module is powered, when a load is placed on the coil. The results obtained from the first to third minutes of the study showed a water temperature ranging from 32.6°C to 64.9°C with a stable current of 17.5 A. From the fourth to the eighteenth minute, the current decreased drastically to 8A, resulting in an excessively long water heating duration of up to eighteen minutes to reach a temperature of 100°C. This occurs because the ZVS module's working system is not functioning correctly. For further research, consider using a power supply and a higher-voltage lithium-ion battery to accelerate the heating process.
Development of a Two-Layer Secure IoT Locker System Using e-KTP RFID and Mobile OTP via Blynk Platform Handasah, Ummu; Afdila, Ryandika; Sani, Arman; Hendrawan, Rizky; Hamid, Muhammadin
Journal of Technomaterial Physics Vol. 7 No. 2 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i2.22170

Abstract

The growing demand for safe storage in public places has highlighted the flaws of single-factor authentication methods such as RFID, which are vulnerable to cloning. This study solves these security weaknesses by building and implementing a safe, low-cost IoT locker with a strong two-factor authentication (2FA) mechanism. The suggested method combines Indonesia's national ID card (e-KTP) for initial RFID-based access with a dynamic One-Time Password (OTP) sent to the user's smartphone via the Blynk IoT platform. The NodeMCU ESP8266-based prototype underwent extensive reliability, performance, and security testing. The results showed that both e-KTP and OTP validation were 100% accurate. The performance research revealed an average OTP delivery time of 5.6 seconds and a total access time of 28.2 seconds. Crucially, security analysis confirmed that the required second factor (OTP) effectively prevented unauthorized access even when the e-KTP was cloned. This study confirms a realistic and scalable two-factor authentication system that considerably increases locker security over single-factor techniques.
Physical and Chemical Characterization of Briquettes Made from a Mixture of Butt Dust and Coconut Shell Charcoal Using Starch Binder Sihotang, Muhammad Sontang; Juwita Febriani Hasibuan; Lilik Waldiansyah
Journal of Technomaterial Physics Vol. 7 No. 2 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i2.21410

Abstract

The global energy crisis demands the development of alternative energy sources that are environmentally friendly and sustainable. One potential solution is the utilization of industrial waste and biomass into solid fuel in the form of briquettes. This study aims to evaluate the characteristics of briquettes made from industrial waste of PT. INALUM, namely butt dust, combined with coconut shell charcoal using starch as a binder. Five variations of butt dust and coconut shell charcoal compositions were tested, namely 100:0%, 80:20%, 60:40%, 40:60%, and 20:80%. Each variation was analyzed for ash content, moisture content, volatile matter, fixed carbon, density, and calorific value. The results showed that the raw material composition influenced the physical and chemical properties of the briquettes. Briquettes with a 100:0% ratio produced the best performance, with the highest calorific value of 9431.14 cal/g, density of 0.2324 g/cm³, ash content of 2.09%, moisture content of 4.22%, volatile matter of 11.0%, and fixed carbon of 82.7%. The addition of coconut shell charcoal tended to reduce calorific value and increase ash content. These findings confirm that butt dust has great potential as the main raw material for producing high-quality briquettes. Practically, the results support the utilization of industrial waste as an alternative energy source, contributing to national energy security while reducing environmental impacts.
Synthesis and Characterization of Natural Pahae Zeolite–Durian Peel Activated Carbon as an Adsorbent for Phosphate Reduction in Laundry Wastewater Susilawati; Fadhilah, Siti; Anggraini, Friska
Journal of Technomaterial Physics Vol. 7 No. 2 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i2.22735

Abstract

This study aims to synthesize and characterize composites based on Pahae Natural Zeolite and Durian Peel Activated Carbon as phosphate reducers in laundry wastewater. Zeolite was activated using 1 M NaCl solution, while activated carbon was prepared by carbonization at 500 °C for 2 hours. The Zeolite–Activated Carbon mixtures were prepared with compositions of 100%:0%, 95%:5%, 90%:10%, 85%:15%, 80%:20%, 75%:25%, and 0%:100%, pressed at 6 tons for 10 minutes, and sintered at 700 °C, 800 °C, and 900 °C for 4 hours. Characterization included physical properties (porosity, water absorption), mechanical properties (hardness), morphology (SEM), crystal structure (XRD), and elemental composition (XRF). The results showed that the optimum condition was achieved at a 75%:25% composition and 700 °C, with porosity of 59.67%, water absorption of 56.06%, and phosphate reduction efficiency of 80.86%. The highest hardness value was obtained at 100%:0% composition at 900 °C, reaching 784.14 MPa. Therefore, the Pahae Natural Zeolite–Durian Peel Activated Carbon composite demonstrates potential as an effective and environmentally friendly adsorbent for wastewater treatment.
Reduction of COD and BOD Levels in Tofu Liquid Waste Processing Using the Electrocoagulation Method Suci, Suci Amanda; Masthura, Masthura; Jumiati, Ety
Journal of Technomaterial Physics Vol. 7 No. 2 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i2.22378

Abstract

Tofu liquid waste treatment is very important because of its high organic content and can cause environmental pollution. This research uses electrocoagulation method with cylindrical aluminum electrodes to lower Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) levels. The variation of the treatment time used is 45, 60, and 75 minutes with a voltage of 12 volts and a distance between the electrodes of 2 cm. The test results showed that the BOD concentration decreased from 816 mg/L to 57–104 mg/L (efficiency 87–93%), while COD decreased from 2696 mg/L to 78–118 mg/L (efficiency 95–97%). In addition, the pH increased from 3.44 to 6.03–6.99 so that it is close to neutral condition. All final results meet the quality standards of liquid waste according to the Regulation of the Minister of Environment and Forestry No. 5 Year 2014, as well as aluminum content according to drinking water quality standards according to Permenkes No. 492/MENKES/PER/IV/2010. Thus, electrocoagulation using cylindrical electrodes is proven to be effective, environmentally friendly, and potentially applied to small to medium-scale tofu waste treatment.
The effect of Electrode Type Differences on BOD and COD Reduction in Tofu Wastewater Treatment khofifahparawansyah, khofifah; Masturah, Masturah; Jumiati, Ety
Journal of Technomaterial Physics Vol. 7 No. 2 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i2.22431

Abstract

Research has been conducted aimed at testing the results of tofu liquid waste samples on the Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) parameters before and after the electrocoagulation process using Al, Cu, and Zn electrodes. This study used tofu liquid waste from Jl. Pasar V Helvetia. The BOD test results before electrocoagulation were 816 mg/L. The BOD test results after electrocoagulation with Al electrodes were 112 mg/L, Cu electrodes were 55 mg/L, and Zn electrodes were 115.2 mg/L. The COD level test results before electrocoagulation were 2696 mg/L. The COD level test results after electrocoagulation with Al electrodes were 95 mg/L, Cu electrodes were 62 mg/L, and Zn electrodes were 105 mg/L. From the electrode variations, the best results were obtained for testing the BOD and COD levels of tofu liquid waste on the Cu electrode.
The Influence of Tensile Strength Test Values on the Elongation of Eco-Friendly Paper Jumiati, Ety; Husnah, Miftahul
Journal of Technomaterial Physics Vol. 7 No. 2 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i2.22746

Abstract

Paper is a thin material in the form of sheets. Environmentally friendly paper is obtained from natural materials derived from discarded waste. This study aims to investigate the characteristics and the effect of elongation values on the tensile strength of the produced paper. The composition variations between taro peel and oil palm frond fibers in paper production were 30%:70% (sample A); 40%:60% (sample B); 50%:50% (sample C); 60%:40% (sample D); and 70%:30% (sample E). The pulp preparation process was carried out using the soda method, while the drying process was conducted naturally at room temperature for 12 hours. The results of the paper characterization for samples A, B, C, D, and E showed tensile strength values of 5.2570 kN/m, 6.2875 kN/m, 7.1985 kN/m, 8.8975 kN/m, and 9.5060 kN/m, respectively, while the elongation test values were 1.09%, 1.12%, 1.15%, 1.24%, and 1.52%. These values have met the requirements for printing paper grade A according to SNI 7274:2008. The results indicate that the higher the composition of oil palm frond fibers used, the greater the tensile strength and elongation values of the paper.
Effect of Magnitude and Distance on Peak Ground Acceleration Using a Modified Akkar & Boomer (2007) GMPE for North Sumatra Tia Melati; Lailatul Husna Lubis; Ratni Sirait; Angga Wijaya
Journal of Technomaterial Physics Vol. 7 No. 2 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i2.22751

Abstract

The Ground Motion Prediction Equation (GMPE) is very important in estimating the intensity of earthquake shocks as a basis for risk mitigation. This study aims to modify and validate the Akkar & Boomer (2007) GMPE using shallow earthquake data in the North Sumatra region for the period 2017–2023. The earthquake data were obtained from BMKG and included parameters such as magnitude, depth, and distance from the source. The analysis method involved nonlinear regression, data cleaning, and validation using residual analysis. The results showed that the maximum ground acceleration (PGA) tended to decrease nonlinearly with increasing distance from the earthquake source. The modified GMPE equation was: Log₁₀ PGA = −0.5916 + 0.5875M + 0.0576M² + (−0.8699 + − 0.1985M) Log₁₀(√R² + 8.2032²) + 0.105, with an R² value of 0.56 and prediction error values such as 0.21; MAE 0.36; RMSE 0.46; STD 0.46). Thus, the modification of GMPE based on local data can provide a more representative estimate of earthquake hazards to support mitigation efforts in North Sumatra.
Failure Mechanism Identification of Hook Components in Automatic Machines Using Visual and Material Analysis RAHMAWATI, NABILA DESY; LUTIYATMI
Journal of Technomaterial Physics Vol. 7 No. 2 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i2.23428

Abstract

The hook component in automatic packaging machines frequently experiences premature failure, leading to increased downtime, higher maintenance costs, and reduced production efficiency. This study aims to identify the failure mechanism of the hook through visual inspection, maintenance data analysis, and material characterization. Visual examination was conducted on broken hook specimens to identify fracture morphology and surface characteristics. Historical maintenance records from 2017 to 2024 were analyzed to identify the frequency and type of failure. Chemical composition testing was performed using Optical Emission Spectroscopy (OES), while Rockwell hardness testing (HRC) evaluated the material’s mechanical properties. The results revealed that the failure mode was categorized as brittle fracture, indicated by flat and granular fracture surfaces without plastic deformation. The main failure factor was the direct impact between the hook and the punch, caused by misalignment due to bearing wear. The material, classified as medium carbon steel with 0.599 wt.% C and 1.000 wt.% Mn, exhibited high hardness but low toughness, leading to a brittle fracture under impact loading. Surface hardening combined with light tempering and shot peening is recommended to improve wear resistance and toughness, thereby reducing the risk of brittle fracture.

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