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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 132 Documents
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Effectiveness of Ozone Plasma Technology in Enhancing the Survival of Gourami (Osphronemus goramy) Fish Eggs Zahar, Intan; Sari, Dian Puspita; Hasanah, Moraida; Z, Fynnisa
Journal of Technomaterial Physics Vol. 7 No. 1 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i1.19860

Abstract

The gourami (Osphronemus goramy) fish is a freshwater fish commonly found in Asia and widely cultivated by fish farmers or local inhabitants. The survival rate of gourami fish from egg to larva and juvenile stages is very low, at approximately 50%. Several factors, such as unstable environmental conditions, poor water quality, and fungal growth on the eggs, cause this. Typically, synthetic medications or natural materials such as betel leaves and others are used to improve gourami fry's survival rate. In this study, the researchers attempted to apply ozone plasma technology dissolved in water to observe the egg hatchability of gourami fish. This study aims to apply technology in fisheries and aquatic sciences. The results of the study show that ozone technology can be applied to observe larval survival, with the highest survival rates found in the 10-minute and 15-minute ozone treatments, both achieving 100% hatchability, with larval survival rates of 86.67% and 96.66%, respectively.
Liquid Fertilizer Solution Stirring Tool Using Arduino Uno Microcontroller Muhammadin Hamid; Aritonang, Endah Sharon; Cholillah, Putri; Afdila, Ryandika; Wijoyo, Hadi
Journal of Technomaterial Physics Vol. 7 No. 1 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i1.19854

Abstract

Automatic fertilizer mixing is required to minimize fertilizer and water mixing time because manual liquid mixing takes a long time. The fertilizer used is liquid, often known as effective microorganisms 4 (EM4) solution. To perfect the stirrer, which is still rotated manually, the DC motor provides speed control for the automatic liquid fertilizer mixer. The speed can be reduced by utilizing the Arduino Uno microcontroller so that the motor rotates according to the required speed. The main mechanical components consist of a DC motor, Arduino Uno as a microcontroller, a power supply as a source of electric current, and a container for mixing liquid fertilizer. The infrared (IR) sensor achieved high accuracy in measuring mixer rotational speed for EM4 fertilizer, with percentage errors ranging from 0.2% to 1.8% compared to tachometer readings. However, when applied to green fertilizer, the error rates varied widely, from 0.03% up to 28.05%, indicating significant fluctuations. These results highlight that the IR sensor is quantitatively reliable for EM4 fertilizer applications but requires further calibration to ensure consistent performance with other fertilizer types
Cycle Voltametry Performance of Nitrogen-Doped Reduced Graphene Oxide Derived from Oil Palm Empty Fruit Bunch for Sodium-Ion Batteries Sihombing, Gunawan; Yamin, Octo Muhammad; Noer, Zikri; Lubis, Hariyati; Agus, Muhammad Abduh Akram; Idamayanti, Dewi
Journal of Technomaterial Physics Vol. 7 No. 1 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i1.18305

Abstract

This study investigates the electrochemical performance of nitrogen-doped reduced graphene oxide (NRGO) derived from oil palm empty fruit bunches as an anode material for sodium-ion batteries (SIB). The aim is to evaluate the potential of NRGO to enhance sodium-ion storage through cyclic voltammetry (CV) analysis. The NRGO was synthesized using a modified Hummers method followed by nitrogen doping through thermal treatment under an ammonia atmosphere. Cyclic voltammetry measurements were conducted at scan rates of 0.2 mV/s, 1 mV/s, and 10 mV/s to analyze the redox behavior and charge storage capacity. At a low scan rate of 0.2 mV/s, the current response was minimal, indicating limited sodium-ion intercalation. At 1 mV/s, the current increased, suggesting enhanced ionic mobility, though no distinct redox peaks were observed, implying a primarily capacitive mechanism. At the highest scan rate of 10 mV/s, the current response increased further, but the absence of clear redox peaks persisted, indicating limited faradaic reactions. The initial CV cycles showed a higher current due to the formation of a solid electrolyte interphase (SEI) layer and structural rearrangements, which stabilized in subsequent cycles. The overall charge storage mechanism appears to be dominated by double-layer capacitance rather than faradaic processes. These findings suggest that NRGO derived from oil palm empty fruit bunches exhibits moderate electrochemical performance as a SIB anode material. While the material demonstrates promising charge storage capabilities, further optimization is required to enhance redox activity. Future research should focus on improving synthesis conditions, such as increasing nitrogen doping levels and enhancing surface area, to achieve better electrochemical performance and make NRGO a viable candidate for sodium-ion battery applications.
Effect of Barium Hexaferrite Doped Yttrium (Y3+) On The Microwave Absorption By Solid-State Reaction Methods Sihotang, Muhammad Sontang; Angelo, Marc Antonio; Naibaho, Marzuki; Maulidita, Maulidita; Ichsan, Novita; Ginting, Masno
Journal of Technomaterial Physics Vol. 7 No. 1 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i1.19265

Abstract

Yttrium-substituted M-type barium hexaferrite was successfully synthesized using the solid-state reaction method. X-ray diffraction (XRD) confirms that all various samples have a single phase (for x = 0,0 and 0,1), have increased trend for crystal size (from 56,99 to 59,34 nm), cell volume (from 697,9161 to 701,2375 Å), and lattice parameter (a = 5,8948 to 5.9024 and c = 23,1918 to 23,2422) caused by ion substitution increased. SEM-EDX figure shows that the particle shape of yttrium-doped barium hexaferrite is hexagonal, and there is a growth in particle size as the amount of doping increases from 1.050 to 1.202 µm, and also the amount of Y3+ ion doping increases, the number of Fe atoms decreases, and the number of Y atoms increases. The materials were characterized using a Vector Network Analyzer (VNA), which shows a minimum reflection loss of x = 0.1 reaching -7,34 dB in the X-band for a thickness of 1.5 mm, better sample variation when compared to other sample variations.
Microcontroller-Based Model Design of Automatic Center of Gravity and Ballast Measurements for MK Bomb Series Piliang, Zuhnir; Lazuardi, Rudi; Hirawan, Agung
Journal of Technomaterial Physics Vol. 7 No. 1 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i1.19362

Abstract

The determination of center of gravity (CG) of Mark 80 series bomb is crucial before being released from fighter-aircraft to reduce or eliminate bomb-pitching; thus, improving target accuracy. Current CG measurement in the service remains conventional, takes a long time, so the determination of ballast is guesswork, and the equipment used is not integrated. Therefore, this study aims to design a model of a microcontroller-based CG and ballast measuring instrument. This tool model uses two load cell sensors (as scales) to measure the weight of the bomb and two ultrasonic sensors to measure the distance between scales. The interface is LCD as digital output, keypad as ballast control and Arduino mega. The experimental method in this study employed test objects in the form of miniature MK 81 bombs and bomb-like test objects with known CG. A total of 6 types of tests obtained a tool accuracy rate of 99.2% with an accuracy of 2 mm. Given the efficiency and accuracy of the measurement, this model of CG and ballast measuring instrument can be a smart solution for military agencies to be used as an effective CG measuring tool for MK 80 bombs.
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.

Page 13 of 14 | Total Record : 132

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