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All Journal ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika TERRA : Journal of Land Restoration Jurnal Teknik Informatika (JUTIF) Jurnal Amplifier: Jurnal Ilmiah Bidang Teknik Elektro dan Komputer
Agustian, Indra
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Agriculture, Biological Sciences & Forestry Computer Science & IT Electrical & Electronics Engineering Engineering

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Soil Moisture Differences Between Continues Measurements of Three Crop Managements Putri, Elsa Lolita; Hermawan, Bandi; Agustian, Indra; Hasanudin
TERRA : Journal of Land Restoration Vol. 6 No. 1 (2023)
Publisher : BPFP Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/terra.6.1.33-39

Abstract

Soil moisture prediction models on a regional scale can be developed by looking for the relationship between water balance and basic soil properties such as texture and organic matter.  Our previous research has obtained soil dielectric properties measurement technology as an estimator of soil moisture that can be done quickly in the field. The purpose of this study was to apply this technology in estimating the characteristics of soil moisture insitu in the field on a district scale in Bengkulu Province.  The research was conducted for three years in three different districts in Bengkulu Province. The results of the third year to early October 2021 study showed that land under thicket stands and oil palm had higher weekly groundwater fluctuations than under rubber. The highest impedace of groundwater below the thickets and palms are present at depths of 0-20 cm and 0-10 cm, respectively.  However thickets have fluctuations in the depth of total groundwater (0-30 cm depth) that are higher than those of oil palms during three months of measurement.  In contrast, the soil moisture content profile under the rubber stand is relatively more stable against the influence of weekly rainfall during the measurement. An analysis of the relationship between non-free variables (field capacity moisture content, permanent wilting point and water available) and free variables (sand, dust, clay and C-organic) will be carried out in November 2021  
Ventilator Non-Invasive berbasis Kontrol Volume dengan Orifice Plate Flow Meter PRIYADI, IRNANDA; HADI, FAISAL; FAURINA, RUVITA; AGUSTIAN, INDRA
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 10, No 2: Published April 2022
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v10i2.259

Abstract

ABSTRAKPada penelitian ini diusulkan ventilator noninvasif dengan sistem kendali volume. Ventilator pada umumnya berbiaya mahal, tidak mudah dibawa dan desain yang rumit. Pada penelitian ini dirancang ventilator noninvasif dengan desain cukup sederhana, mudah dibawa, dan ekonomis. Mekanisme kendali volume didapatkan melalui pengukuran aliran dengan prinsip orifice flow meter. Pengukuran aliran ini dilakukan dengan menurunkan persamaan Bernoulli dan persamaan kontinuitas, sehingga didapat persamaan debit aliran. Koefisien discharge optimal pada persamaan debit aliran yang digunakan pada penelitian ini adalah 0,9. Melalui pengujian RR (Respiratory Rate) 12, 16 dan 20 BPM (Breath Per Minute), minute ventilation terbaik diperoleh pada RR 12, yaitu 498,5541±3,3255, dengan simpangan terbesar 4,7714 mL atau sebesar 0,95%. Sedangkan performa terendah pada RR 16 dengan minute ventilation 503,7034±4,1626, simpangan terbesar 8,21 mL atau sebesar 1,64%. Ini mengindikasikan bahwa sistem kendali volume pada ventilator noninvasif berkerja dengan cukup baik. Saat ini ventilator hanya mampu mensuplai tekanan hingga 1,5 kPa atau sekitar 15,296 cmH2O.Kata kunci: ventilator noninvasif, kontrol volume, orifice flow meter, sensor tekanan, koefisien discharge ABSTRACTIn this research, a ventilator with a volume control system is proposed. Ventilators are generally expensive, not portable, and have a complex design. In this research, a non-invasive ventilator was designed with a fairly simple design, easy to carry, and of economic value. The volume control mechanism is obtained through-flow measurement with the orifice flow meter principle. This flow measurement is done by deriving the Bernoulli equation and the continuity equation, in order to get the flow rate equation. The optimal discharge coefficient in the flow discharge equation used in this study is 0.9. By RR (Respiratory Rate) testing 12, 16, and 20 BPM (Breath Per Minute), the best minute ventilation is obtained at RR 12, which is 498.5541±3.3255, with the largest deviation of 4.7714 mL or 0.95%. While the lowest performance is on RR 16 with minute ventilation 503.7034±4.1626, the largest deviation is 8.21 mL or 1.64%. A fairly small error indicates that the volume control system on a noninvasive ventilator is designed to work quite well. Currently, the ventilator is only capable of supplying pressure of up to 1.5 kPa or about 15.296 cmH2O.Keywords: non invasive ventilator, volume control, orifice flow meter, pressure sensor, discharge coefficient
Perancangan Alat Uji Impak Digital dengan Metode Charpy Untuk Mengukur Kekuatan Material Polimer Nuhgraha, Yudho; Rosa, M. Khairul Amri; Agustian, Indra
JURNAL AMPLIFIER : JURNAL ILMIAH BIDANG TEKNIK ELEKTRO DAN KOMPUTER Vol. 10 No. 2 (2020): Amplifier November Vol. 10, No. 2 2020
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jamplifier.v10i2.15316

Abstract

AbstrakPada penelitian ini dilakukan pembuatan alat uji impak metode Charpy secara digital dengan menggunakan sensor rotary encoder dan mikrokontroler. Uji impak merupakan salah satu metode yang digunakan untuk mengetahui kekerasan, kekuatan serta keuletan material. Untuk mengetahui keakuratan alat uji impak yang telah dibuat maka dilakukan perbandingan antara alat uji impak otomatis dengan alat uji impak manual. Hasil pengujian menunjukkan bahwa alat uji impak digital otomatis yang dirancang memiliki performa yang lebih baik dibandingkan dengan pengujian manual.Kata kunci: uji impak digital, metode charpy, material polimer
Sistem Kendali Suhu Mesin Tetas Telur Ayam Buras Menggunakan Kontroler PID dengan Metode Tuning Ziegler Nichols Open Loop Step Response Agustian, Indra; Prakoso, Dian S; Faurina, Ruvita; Daratha, Novalio
JURNAL AMPLIFIER : JURNAL ILMIAH BIDANG TEKNIK ELEKTRO DAN KOMPUTER Vol. 12 No. 1 (2022): Amplifier Mei Vol. 12, No 1 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jamplifier.v12i1.21535

Abstract

An egg incubator is a tool that helps the process of hatching eggs using an electric heater and is equipped with an egg rack that functions to evenly distribute the heat in the incubator. Good temperature control in the hatching process is something that greatly affects the hatching results. In this study, an egg incubator temperature control system was designed using the PID method with the Ziegler Nichols Open Loop Step Response tuning method. The control system is specifically for free-range chicken eggs which require a normal temperature of 37 °C-39 °C. The main control components are the microcontroller, the incandescent lamp heater, and the DHT22 temperature sensor. The open loop test shows a time delay of 20 seconds and a time constant of 385 seconds, so with the Ziegler Nichols open loop tuning method, the values of Kp = 23.1, Ki = 40, and Kd = 10. The test results show that the PID controller can control the temperature properly. In testing the hatching process within 21 days, the temperature control worked well, and the effect of changes in day and night temperature did not significantly affect the performance of the PID controller.
Optimal Phase Selection Of Single-Phase Appliances In Buildings Using String-Coded Genetic Algorithm Daratha, Novalio; Vatresia, Arie; Santosa, Hendy; Agustian, Indra; Suryadi, Dedi; Gupta, Neeraj
Jurnal Teknik Informatika (Jutif) Vol. 6 No. 3 (2025): JUTIF Volume 6, Number 3, Juni 2025
Publisher : Informatika, Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52436/1.jutif.2025.6.3.4603

Abstract

Phase imbalance in buildings, primarily caused by single-phase loads and generation, leads to increased neutral current, voltage imbalance, reduced energy efficiency, and potential equipment damage. To address these challenges, an optimal phase selection method is proposed for single-phase loads and generation. This method integrates integer programming with a string-coded genetic algorithm (GA). The GA employs string encoding to represent phase connections. Initially, a Mixed Integer Programming (MIP) solver identifies an initial solution, which is subsequently transformed into a string to initialize the GA’s genes. Subsequently, the GA executes standard operations such as mutation, crossover, evaluation, and selection. Case studies demonstrate the efficacy of this method in achieving substantial load balancing. Notably, the identification of multiple solutions with identical objective function values renders this approach suitable for smart buildings equipped with energy management systems that participate in ancillary services between low-voltage and medium-voltage networks. This research pertains to the domains of computer science, power engineering, and energy informatics.
Co-Authors Arie Vatresia Bandi Hermawan Daratha, Novalio Dedi Suryadi Faurina, Ruvita Gupta, Neeraj Hadi, Faisal Hasanudin Irnanda Priyadi Nuhgraha, Yudho Prakoso, Dian S Putri, Elsa Lolita Rosa, M. Khairul Amri Santosa, Hendy