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All Journal TEKNIK Indonesian Journal on Computing (Indo-JC) RESISTOR (Elektronika Kendali Telekomunikasi Tenaga Listrik Komputer) Jurnal Teknik Elektro dan Komputer
Christian Fredy Naa
Department Of Electrical Engineering (Mechatronics), Universitas Katolik Parahyangan
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology

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Modeling The Effect of Particle Size on Magnetic Nanoparticles using Modified Ising Model Christian Fredy Naa
Indonesia Journal on Computing (Indo-JC) Vol. 4 No. 1 (2019): Maret, 2019
Publisher : School of Computing, Telkom University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21108/INDOJC.2019.4.1.299

Abstract

In this article, the Ising model has been modified to simulate the effect of particle size on magnetic nanoparticles properties especially hole-doped manganites. The objective of this research is to give an insight and clear understanding about magnetic nanoparticles especially the effect of the particle size. The model considers common accepted magnetic nanoparticles theoretical model where each particle consists of core and surface/boundary part. The model mimics the particles size as a clusters or group of spins. The spins were designated as either core or boundary particles and differs for their exchange energy. The model predicts magnetization, coercivity, hysteresis and magnetic characteristics of core and boundary of the nanoparticles. The results are in a good agreement qualitatively with experimental results. The model also gives insight to the micro-states of the spin at each clusters for zero-field-cooled experiment.
Desain Sistem Pendayaan Energi Listrik pada Rumah Kaca Pintar dengan Menggunakan Pembangkit Listrik Tenaga Surya Levin Halim; Christian Fredy Naa
RESISTOR (Elektronika Kendali Telekomunikasi Tenaga Listrik Komputer) Vol 2, No 1 (2019): RESISTOR (Elektronika Kendali Telekomunikasi Tenaga Listrik Komputer)
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (198.743 KB) | DOI: 10.24853/resistor.2.1.43-50

Abstract

Kecenderungan pada dewasa ini, ada berbagai masalah yang muncul pada bidang pertanian. Salah satu dari masalah tersebut yang paling utama adalah keterbatas lahan untuk ditanami. Perlu diketahui bahwa dengan peningkatan jumlah penduduk dan pembangunan, ketersediaan lahan pun menjadi berkurang secara signifikan. Rumah kaca menjadi salah satu jawaban dari masalah tersebut. Rumah kaca pada jaman ini sudah dilengkapi dengan sistem kendali dan monitoring sebagai salah satu improvement rumah kaca cerdas. Tentunya Rumah Kaca cerdas seperti demikian membutuhkan energi listrik yang handal dan berkelanjutan untuk mendapatkan fungsi rumah kaca cerdas yang baik. Penelitian ini melakukan analisis, simulasi, desain, dan implementasi nyata sistem pendayaan energi listrik untuk rumah kaca tersebut. Pendayaan energi listrik tersebut akan didayai dengan energi terbarukan yaitu energi matahari dengan teknologi PV pada Pembangkit Listrik Tenaga Surya. Sehingga dibutuhkan identifikasi beban-beban dan kebutuhan listrik yang ada pada rumah kaca, pemilihan desain sistem energi rumah kaca, penentuan spesifikasi peralatan-peralatan yang diperlukan, serta implementasi pendayaan energi listrik rumah kaca tersebut
Peningkatan Akurasi Konsentrasi Pemberian Pupuk Pada Sistem Hidroponik Menggunakan Programmable Logic Controller Ali Sadiyoko; Kevin Adi Perdana; Christian Fredy Naa
TEKNIK Vol. 44, No. 2 (2023): August 2023
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v44i2.53301

Abstract

Hydroponics is a farming method using water as a medium for storing nutrients (fertilizer/nutrients). Therefore, the concentration of dissolved fertilizers in the water is crucial for plant growth. The method of measuring dissolved fertilizers in hydroponic systems is usually done by measuring the value of the EC and Total Dissolved Solids of the solution. However, because the EC and TDS measurement processes are not carried out continuously, this can result in plant growth being disrupted. In this study, an automatic fertilizer concentration control system was designed based on EC values that can be monitored continuously. The fertilizer concentration control process will be carried out automatically using a PLC, which is equipped with a TDS sensor and several pumps. EC value measurements are carried out indirectly using a TDS sensor. Testing of the design system was carried out for 8 days, during which time the design of this system managed to maintain EC values between 0.844 mS/cm to 1.051 mS/cm. The standard EC value required by lettuce plants is 0.8 mS/cm ~ 1.2 mS/cm. This shows that this system is more accurate than the reference system, which is able to maintain EC values between 0.8 mS/cm to 1.2 mS/cm.
Sistem Pemantauan Rumah Kaca berbasis ESP32, Raspberry Pi, MQTT dan Node-RED Christian Fredy Naa
Jurnal Teknik Elektro dan Komputer Vol. 11 No. 3 (2022): Jurnal Teknik Elektro dan Komputer
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35793/jtek.v11i3.45151

Abstract

Greenhouse is a place to grow plants where the micro climate is controlled to achieve the best possible climate to grow plants. The micro climate involve three different states namely the state of the outside and inside air of the greenhouse and the state of the soil where the plants grow. The focus of this research is to design monitoring system which able to monitor those three states. The system is built based on four temperature and humidity sensors, two microcontoller ESP32, communication protocol MQTT and Node-RED. The sensors have been carefully selected in order to obtain particular measurements. The system has been tested for one day. The system is able to show the measurement data and record it in .csv format. The system is able to picture qualitatively the dynamics of weather and watering inside and outside of the greenhouse.
Co-Authors Ali Sadiyoko Halim, Levin Kevin Adi Perdana