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Gurum Ahmad Pauzi
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Journal of Energy, Material, and Instrumentation Technology
Published by Universitas Lampung
ISSN : 27472043     EISSN : 2747299X     DOI : https://doi.org/10.23960/jemit
Core Subject : Science, Engineering,
Control & Systems Engineering Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
Ruang lingkup penulisan dalam jurnal ini meliputi: 1. Fisika Teori Mekanika Klasik Elektromagnetik Termodinamika Mekanika Statistik Mekanika Kuantum Teori Relativitas Kuantum Gravitasi Astrofisika Kosmologi 2. Fisika Bumi (Geofisika) Geothermal Geolistrik Seismik Geomagnet 3. Fisika Material Nanomaterial Logam dan Korosi Material Magnetik Thin Film Fotokatalis/Katalis Semikonduktor Superkonduktor Keramik Polimer 4. Elektronika dan Instrumentasi Sensor Instrumentasi Biomedik Instrumentasi Pertanian Instrumentasi Lingkungan Biofisika Fisika Komputasi Laser 5. Fisika Nuklir Keselamatan Reaktor Analisis Neutronik Manajemen Bahan Bakar dan Limbah
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 121 Documents
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RANCANG BANGUN DUAL AXIS SOLAR TRACKER MENGGUNAKAN LENSA FRESNEL BERBASIS INTERNET OF THINGS (IOT) UNTUK OPTIMASI DAYA OUTPUT SOLAR CELL Kurniawansyah, Rifki Mohamad; Kusmita, Aryu; Ayu, Humairoh Ratu
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 1 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.v6i1.248

Abstract

A single-axis solar tracker using a Fresnel lens has been realized to optimize the output power of solar cells. The solar tracker system is monitored using a website that displays the value of voltage (volts), current (amperes), tilt angle (0), and output power (watt) in real-time. This single-axis solar tracker is designed using a 20 Wp solar panel, Fresnel lens, Solar Charger Controller, Accumulator, Arduino Nano, ESP32, Buck Converter, L298N motor driver, FZ0430 sensor as voltage meter, ACS712 sensor as current meter, MPU6050 sensor as angle meter. The method used in this research includes collecting data on voltage, current, tilt angle, power generated by solar panels, and light intensity and temperature emitted by the sun for 3 days without and 3 days using lenses. This tool can measure the voltage value of direct electricity with an error rate of 1.88%, accuracy of 98.12%, and precision of 99.15%. The electric current measurement has an error rate of 3.82%, an accuracy of 96.18%, and a precision of 96.84%. Light measurement has an error rate of 1.85%, an accuracy of 98.15%, and a precision of 98.78%. The angle measurement has an error rate of 5.95% and an accuracy of 94.05%. The single-axis solar tracker system using Fresnel lenses has a power efficiency of 37.09% compared to the single-axis solar tracker without Fresnel lenses.
Sand Deposit Control Strategy on Centrifugal Pump Type Overhung 4 Size 4x11 Using API 682 Piping Plan 13 Malik, Miftahul Fahrizal Nur; Hidayati, Noor; kamal, Dianta Mustofa
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 1 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.v6i1.278

Abstract

Centrifugal pumps type Overhung 4 size 4x11 often experience sand deposits and erosion problems, especially in the oil and gas industry, resulting in reduced productivity and increased repair costs. This study evaluates the application of the Piping Plan 13 API 682 as a solution to this problem. The 5-Why Analysis method is used to identify the root cause of sand deposits, which were associated with sand contamination from a liquid source and the absence of an effective filtering system. The implementation of Piping Plan 13 aims to prevent sand deposits in critical areas, such as the Pedestal Cover and Pedestals, by leveraging the circulation design of the pipeline. The results showed a 19.75% increase in pump productivity and a 76.12% reduction in repair costs. Productivity increases reached 336,000 barrels (about 53,419,731 liters) over 16 days of operation, while the repair cost fell from Rp6,699,950 to Rp1,600,000. These findings indicate that Piping Plan 13 API 682 is an effective solution to increase the life and performance of the centrifugal pump and reduce maintenance costs in operating conditions with high sand contamination.
Manufacture of Nanocellulose from Red Onion Peel Waste Using Acid Hydrolysis Method with Variation of H2SO4 Concentration Shabrina, Shabrina Yakosati; Manurung, Posman; Suciyati, Sri Wahyu; Karo, Pulung Karo
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 2 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.v6i2.172

Abstract

The manufacture of nanocellulose from red onion peel waste has been carried out using the acid hydrolysis method using H2SO4. This study aims to determine the effect of variations in the concentration of H2SO4 on the size of nanocellulose crystallites from onion peels and the surface morphology of nanocellulose from onion peels. The manufacture of nanocellulose was carried out in three stages, namely delignification using 10% NaOH to remove lignin and hemicellulose, bleaching using 10% H2O2 for bleaching and isolation of nanocellulose using H2SO4. The variation of H2SO4 used is 5; 10; 15 and 20%. The characterizations used are XRD (X-Ray Diffraction) and SEM (Scanning Electron Microscopy). The results of XRD characterization showed that the crystalline phase contained at the highest diffraction peak and the optimum concentration of H2SO4 to make nanocellulose from onion peel was 20%. The results of SEM characterization showed that the morphology of the onion peel nanocellulose was still united to form bundles or agglomerates.
IMPLEMENTASI BOOST CONVERTER PADA SISTEM SEL VOLTA BERBAHAN AIR LAUT DENGAN KATODA TEMBAGA BERLAPIS PERAK Pauzi, Gurum Ahmad; Rianita Baiti; Supriyanto, Amir; Junaidi
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 2 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.v6i2.180

Abstract

The overpotential characteristics of a high-voltage seawater battery system were systematically analyzed, employing a silver-coated copper cathode and a zinc anode. This study evaluated the system's electrochemical performance using a quantitative approach based on the Butler-Volmer equation. The exchange current density and the time-dependent overpotential profile were estimated to gain insight into the electrochemical kinetics involved. A total of 20 voltaic cells were assembled in a series-parallel configuration and subjected to loaded operation for 55 minutes. During the experiment, an exponential decrease in current—from 2.6 mA to 0 mA—was recorded, which was attributed to internal resistance and charge transfer limitations. The modeling process was carried out using nonlinear fitting, through which the exchange current density was found to range between 0.15 and 0.3 mA/cm². The charge transfer coefficient (α) was also determined to be approximately 0.5, indicating a relatively balanced rate of anodic and cathodic reactions. It was demonstrated that the silver coating on the copper cathode significantly enhanced electrochemical activity by improving the catalytic surface, thereby increasing both current response and long-term system stability. These results highlight the potential of surface-modified electrodes in advancing seawater battery technologies.
Ahmad Ilham Kamal Pemanfaatan Hall Effect untuk Mendeteksi Kebocoran Arus pada Beban Cabang Sistem DC Menggunakan Metode Beda Arus Positif-negatif Kamal, Ahmad ilham; Dona, Nur Rahma
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 2 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.v6i2.232

Abstract

Currently, many industries use DC power as a power supply for controller equipment, etc. All companies want their DC system to be reliable. One effort to maintain the reliability of the DC system is to monitor the leakage current in each branch of the DC system load. Leakage currents that occur if not discovered early on will gradually result in short circuit currents and instability of the DC system. This research wants to use the hall effect to detect leakage currents in branch loads using the difference in current in the positive (+) and negative (-) cables. Use the right-hand law for the direction of the magnetic field. Insert the positive (+) and negative (-) cables into the same Hall sensor where the resultant magnetic field will be 0 under normal circumstances and >0 or <0 if there is a leakage current in one of the cables. Because of this, the Hall effect can be used to detect leakage currents (Ground Fault) in DC systems. Another advantage of the Hall effect is that it monitors DC system leakage currents continuously while operating.
Initial Study of Intrusion on The Serambi Nusantara Coast Using Geoelectrical Methods Delianti, Delianti; Choerullah, Andy; Muslim, Anis Aulia
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 2 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.v6i2.293

Abstract

The Serambi Nusantara area, based on geological conditions, has alluvial formations with sand that almost dominates, interspersed with clay rock throughout the location with swamp conditions in most parts of the area. Morphologically, Serambi Nusantara is a coastal area. Most of the population in this area uses groundwater to meet their water needs due to the increasing intensity of use so groundwater is decreasing and there is emptiness in the well cavities, this results in seawater seeping from these cavities and mixing with groundwater which causes water problems in this area, especially the salinity of the water quality. This research was carried out to determine the quality of groundwater using the Induction Polarization (IP) method, in the Serambi Nusantara area where the research stage included geological mapping of the area with results according to the description above, checking water quality data and geoelectric measurements of induced Polarization (IP). In the research results, it was found that the cross-sectional chargeability value at a depth of ± 20 m showed low chargeability (-10 msec), indicating an indication of seawater intrusion in the research area. This value is similar to previous research.
Effect of Corona Plasma Radiation on the Contact Angle and Wettability of Bamboo Surface Alfajrin, Achmad Chalid Afif; Muhlisin, Zaenul; Komariah, Rahma Nur; Putra, Bintang Ridzky Ranindra; Nazuwatussya'diyah, Nazuwatussya'diyah; Arzi, Yudha Hamdi; Mardhiyatna, Mardhiyatna; Sari, Rizki Yustisia
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 2 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.v6i2.294

Abstract

Bamboo is a widely utilized non-timber forest product, often innovated into laminated boards, particle boards, and plywood. The outer bamboo surface (skin) possesses high compressive strength but exhibits hydrophobic properties, limiting its wettability toward liquids. Plasma corona technology, operating at atmospheric pressure and using surrounding gases at a relatively low cost, offers a promising solution to modify bamboo surfaces by increasing their surface energy. This study aimed to analyze the hydrophilic resistance and wettability of bamboo surfaces treated with plasma corona, measured through contact angle analysis. The direct drop method was employed by dripping water and phenol formaldehyde (PF) fluids onto bamboo surfaces treated with plasma corona. Contact angle measurements were performed using ImageJ drop analysis software. Results demonstrated that plasma corona treatment significantly reduced contact angle values, improving surface wettability. Untreated bamboo surfaces showed contact angles of 72.7° for water and 111.5° for PF fluids, indicating limited wettability. Post-treatment, the contact angles decreased to less than 30° for water and below 90° for PF, signifying enhanced wettability. However, the hydrophilic properties were found to be non-permanent, with contact angle values gradually increasing over 13 days of observation. Among the tested parameters, plasma corona treatment with a current strength of 75 mA for 5 minutes provided the most optimal wettability improvement for water and PF fluids. This study highlights the effectiveness of plasma corona in enhancing bamboo surface wettability, making it more suitable for applications requiring adhesive bonding or fluid spreading in industrial processes.
The Effect of Biaxial Strain on The Thermoelectric Properties of 2D SiBi Anshory, Muhammad; Y. Hanna, Muhammad
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 4 (2025): Journal of Energy, Material, and Instrumentation Technology (In Press)
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.v6i2.296

Abstract

This study investigates the electronic and thermoelectric properties of two-dimensional silicon bismuth (2D SiBi) using first-principles Density Functional Theory (DFT) calculations. The 2D SiBi monolayer is identified as a semiconductor with an indirect band gap of 0.67 eV. Solving the Boltzmann transport equation reveals outstanding thermoelectric performance, evidenced by high Seebeck coefficients of 1243.79 &micro;V/K (p-type) and 1217.23 &micro;V/K (n-type) at room temperature. Most significantly, the application of a modest -1% biaxial compressive strain induces a substantial enhancement in these values, elevating them to 1361.75 &micro;V/K and 1371.85 &micro;V/K for p-type and n-type carriers, respectively. These results demonstrate that mechanical strain is an effective strategy for tuning and optimizing the thermoelectric efficiency of 2D SiBi, positioning it as a highly promising material for next-generation thermoelectric devices.
Hybrid DFT-ML-MD Approach for Derivation of Lennard-Jones Interatomic Potential Parameters of Al Arkundato, Artoto; Widiasih; Ratnadewi, Anak Agung Istri Ratnadewi; Syah, Khalif Ardian; Yulianti, Yanti
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 2 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.v6i2.306

Abstract

Atomistic simulation based on computational physics of methods is used to develop accurate interatomic potentials based on DFT (density functional theory) data. The accuracy of predicting the physical properties of a material is highly dependent on the quality of the interatomic potential used. The purpose of this study is to determine the Lennard-Jones potential parameters of Al metal (epsilon and sigma) from fitting the DFT simulation output data. The use of a “robust” fitting method to reduce the influence of outliers on the potential results is very important and therefore a machine learning method is used to help find the right potential parameters. The method used is a hybrid method using DFT to generate training data, using ML (machine learning) to fit DFT data to the Lennard-Jones (LJ) potential model, and using the MD (molecular dynamics) method to validate the LJ potential parameters. Python-based programming is applied to facilitate how the three methods can be connected. The results of this study are that Al metal has an epsilon value = 0.5000 eV and sigma Al = 3.2072 Å, with a regression coefficient R2 = 0.9441 so that it can be concluded that this study can be said to be quite good and the hybrid method can be further developed to obtain the LJ potential parameter values of various other materials, especially metals.
Rancang Bangun Alat Deteksi Kadar Kolesterol Dalam Darah Dengan Teknik Non Invasive Berbasis Mikrokontroler Wemos D1 R1 Yuniar, Noeris; Supriyanto, Amir; Ayu, Humairoh Ratu; Suciyati, Sri Wahyu
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 3 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.213

Abstract

Cholesterol level checks are generally performed either invasively or using a portable blood test strip. It requires a long laboratory analysis time and causes pain in the body, so a non-invasive tool is needed to check cholesterol levels. The study aims to detect cholesterol levels in the blood with a non-invasive technique based on the Wemos D1 R1 Microcontroller using the DS100A Oximeter Sensor. This tool is equipped with a Liquid Crystal Display (LCD) as a cholesterol level display and an LED light as a cholesterol level indicator that will light up red when cholesterol is high (>=240 mg/dL), light up yellow when cholesterol is at the high limit (200-239 mg/dL), and light up green when cholesterol is normal (<=200 mg/dL). Cholesterol level measurement is done by utilizing the red LED light emission on the sensor attached to the finger. Then, the photodiode will capture the light intensity from the red LED into a voltage value. A 10-bit ADC on the microcontroller then reads the voltage value. The ADC value was then converted into a cholesterol level in milligrams per deciliter (mg/dL) using a linear regression equation. The designed device is capable of detecting cholesterol levels in the range of 150-240 mg/dL. Test results indicate that the non-invasive cholesterol level test device has been successfully developed, with a precision of 98.85% and an error of 1.15%. Accuracy testing yielded a value of 97.14% with an error of 2.86%.

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