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All Journal Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Jurnal Ilmu Pertanian Indonesia Agrikultura Interest : Jurnal Ilmu Kesehatan Jurnal Agribisnis Indonesia (Journal of Indonesian Agribusiness) Forum Agribisnis JITRO (Jurnal Ilmiah dan Teknologi Peternakan Tropis) Jurnal Ekonomi Pembangunan: Kajian Masalah Ekonomi dan Pembangunan BERITA BIOLOGI Jurnal Penelitian Pertanian Terapan Buletin Ilmiah Litbang Perdagangan Jurnal Pengembangan Rekayasa dan Teknologi Elektrika Jurnal Agribest Agrisocionomics: Jurnal Sosial Ekonomi Pertanian Astonjadro Tunas: Jurnal Pendidikan Guru Sekolah Dasar Agro Bali: Agricultural Journal Jurnal Risalah Kebijakan Pertanian dan Lingkungan Jurnal Teknologi Lingkungan Lahan Basah Andalas Journal of Electrical and Electronic Engineering Technology Media Ekonomi Social Science Academic AGRIC Tematik Policy Brief Pertanian, Kelautan, dan Biosains Tropika Jurnal Agripet
Harmini, Harmini
Departemen Agribisnis, Fakultas Ekonomi Dan Manajemen, Institut Pertanian Bogor Jalan Kamper Wing 2 Lantai 5, Kampus IPB Dramaga, Bogor-Indonesia 16680, Telepon: +62-251-626520
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PEMODELAN SISTEM PEMBANGKIT HYBRID ENERGI SOLAR DAN ANGIN Harmini, Harmini; Nurhayati, Titik
Elektrika Vol. 10 No. 2 (2018): Oktober 2018
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1008.067 KB) | DOI: 10.26623/elektrika.v10i2.1167

Abstract

Hybrid energy system is to combine two energy sources that will provide power to the load. Sources of solar energy and wind energy will be used to generate power. In this research will be designed a model of hybrid system of solar energy and wind energy. The system is made equipped with energy storage systems in the form of batteries. Simulation or modeling using a circuit with components appropriate to the field application. Analysis of this system is the performance of hybrid generator characteristics based on load changes in the form of voltage, current and power values. The power generated by the PLTS is 3,000 Watts and the wind generator is 1,000 Watt with a resistive load of 4,000 Watt. Hybrid system generates a power of 2640 Watt so that the efficiency of hybrid system by 66%Keywords: Hybrid system, wind energy, solar energy
MODEL SISTEM INFORMASI MONITORING PERKULIAHAN FAKULTAS TEKNIK UNIVERSITAS SEMARANG BERBASIS WEB Derman, Derman; Harmini, Harmini
Elektrika Vol. 10 No. 2 (2018): Oktober 2018
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (729.65 KB) | DOI: 10.26623/elektrika.v10i2.1260

Abstract

The development of Information Technology is increasingly demanding that Higher Education to provide information quickly to meet the needs of Information and Monitoring Course for Lecturers, Students and Admin staff. This study aims to design a Model Information System and Monitoring Course at the Faculty of Engineering, University of Semarang Web-based. Coverage includes lecture planning, lecturing, evaluation of lecturing, control of lecturing and improvement of lecture planning. This research produces an application of Information System and Monitoring model of lecturing which aims to facilitate and accelerate the preparation of time, room and course schedule and ease in monitoring the attendance status of lecturers in class either to students or other parties in real time without having to come to campus check board information . The contribution of this research results will greatly affect the application of science and technology for higher education institutions and to realize the development of Faculty of Engineering Semarang University as a leading Faculty in 2023. The method used is dynamic priorities method which prioritizes the process that has the highest priority and is able to respond to changes in the system environment operate. Modeling the system using XAMPP package in which integrated MySQL module for database purposes, PHP for management of information systems, and Apache for simulation purposes. The results showed the implementation of the application of Information Systems Monitoring System Lectures Faculty of Engineering, University of Semarang goes well.
DESAIN GENERATOR OZONE DENGAN TEKNOLOGI PLASMA DBD (Die-lectric Barrier Discharge) Aryadi, Ricky; Supari, Supari; Harmini, Harmini
Elektrika Vol. 11 No. 1 (2019): April 2019
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (911.057 KB) | DOI: 10.26623/elektrika.v11i1.1535

Abstract

Industrial sterilization is a very important problem. Ozone is a powerful oxidizer that can function for sterilization and is environmentally friendly. Plasma DBD (Dielectric Barrier Discharge) is one of the effective technologies to obtain ozone. The ozone generator currently uses a lot of manual control operations. Manual control uses a mechanical system in the form of a potentiometer to calibrate the frequency and output of the ozone generator output, so that digitization and automation are needed to operate to replace human labor. The design of the digital ozone control generator is done using an AVR microcontroller. Programming used in this research is basic language (BASCOM), then uses a DAC (Digital to Analog Converter) system which is the output of a Microcontroller with a Weighted Binnary Resistor. The output of the microcontroller is frequency and 8 bit digital with a decimal parameter of 200. The result of automation is that the timer works for 2 hours. The greater frequency the ozone produced. At a frequency of 1500Hz the power produced is 308.58 watts with an ozone concentration of 59 ppm. Efficiency using a switching system> 90%.                                                                                                                                                                                                  Keywords: Plasma, AVR Microcontroller, Ozone.
PREDIKSI BEBAN ENERGI LISTRIK APJ KOTA SEMARANG MENGGUNAKAN METODE RADIAL BASIS FUNCTION (RBF) Cahyo, Mukti Dwi; Heranurweni, Sri; Harmini, Harmini
Elektrika Vol. 11 No. 2 (2019): Oktober 2019
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (696.005 KB) | DOI: 10.26623/elektrika.v11i2.1699

Abstract

Electric power is one of the main needs of society today, ranging from household consumers to industry. The demand for electricity increases every year. So as to achieve adjustments between power generation and power demand, the electricity provider (PLN) must know the load needs or electricity demand for some time to come. There are many studies on the prediction of electricity loads in electricity, but they are not specific to each consumer sector. One of the predictions of this electrical load can be done using the Radial Basis Function Artificial Neural Network (ANN) method. This method uses training data learning from 2010 - 2017 as a reference data. Calculations with this method are based on empirical experience of electricity provider planning which is relatively difficult to do, especially in terms of corrections that need to be made to changes in load. This study specifically predicts the electricity load in the Semarang Rayon network service area in 2019-2024. The results of this Artificial Neural Network produce projected electricity demand needs in 2019-2024 with an average annual increase of 1.01% and peak load in 2019-2024. The highest peak load in 2024 and the dominating average is the household sector with an increase of 1% per year. The accuracy results of the Radial Basis Function model reached 95%.
Desain Solar Power Inverter pada Sistem Photovoltaic Harmini, Harmini; Nurhayati, Titik
Elektrika Vol. 12 No. 1 (2020): April 2020
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (750.951 KB) | DOI: 10.26623/elektrika.v12i1.1863

Abstract

Solar power inverter is one of the main components in the PLTS system in order to produce the power or energy needed by the load. Solar power inverter is used to convert from DC energy (Direct Current) to AC (Alternating Current) to load. In this research a simulation of a solar power inverter system on a photovoltaic system will be designed. Simulation is done using SIMULINK-MATLAB software. Solar power inverter is designed using a boost converter as a controller and a Full-Bridge Inverter. Boost Converter is designed from 12VDC - 17 VDC to 300 VDC. Full Bridge Inverter produces AC voltage of 240 VAC with modulation index 0.8 and frequency 60 Hz. Total Harmonic Distortion is 46.07%. Power of Photovoltaic Solar panels generated at 3500 Watts at 1000 Watt / m2 irradiation conditions and temperature temperatures of 25 degrees Celsius.
Perkiraan Pemakaian dan Kebutuhan Beban Energi Listrik Rayon Juwana Menggunakan Jaringan Saraf Tiruan (Radial Basis Function) Fitriyan, Moh Tamam Edy; Heranurweni, Sri; Harmini, Harmini
Elektrika Vol. 13 No. 1 (2021): April 2021
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/elektrika.v13i1.3329

Abstract

Along with the development of the times the need for electrical energy is increasing. PT. PLN (Persero) as a company that supplies electrical energy must be able to meet the needs of electrical energy to run a business to supply electric power in an even amount to meet the needs of the household, industrial, social and business sectors.. The purpose of this research to determine how much the growth of electrical loads in 2020 to 2025 at PT. PLN (Persero) Rayon Juwana. To find out the amount of increase in electrical energy required. Electrical data used data for 8 years, from 2012 to 2019. The results of this study are in the form of an estimate of the use and need for load electrical energy load for the next 5 years, from 2020 to 2025, the data used are the number of subscribers, connected power, and the amount of energy using a simulated neural network with the method (radial basis function). the results of this study an increase per year an average of 1% per year. in 2019 the value is 1.07%, in 2020 it is 1.10%, 2021 is 1.21%, for 2022 it is 1.27%, 2023 is 1.28%, 2024 is 1.17% and 2025 is 1.31 %.
Produktivitas Tanaman Trichanthera gigantea pada Berbagai Taraf Naungan dan Pupuk Kandang Kelinci Iwan Herdiawan; Harmini, Harmini
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 48 No. 2 (2020): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (294.984 KB) | DOI: 10.24831/jai.v48i2.29784

Abstract

Sebagian besar tanaman pakan ternak (TPT) dikembangkan di lahan marjinal dan integrasi dengan tanaman pangan maupun perkebunan. Trichantera gigantea (TG) merupakan tanaman pakan ternak (TPT) yang termasuk legum pohon dengan kandungan nutrisi cukup baik dan toleran naungan. Tujuan penelitian ini untuk mengetahui pengaruh interaksi antara naungan dengan pemberian pupuk kandang terhadap produktivitas dan karakteristik pertumbuhan tanaman Trichantera gigantea (TG). Rancangan yang digunakan adalah rancangan acak kelompok (RAK) faktorial dengan dua faktor. Faktor pertama adalah perlakuan naungan yaitu 0, 36, dan 72%, dan faktor kedua adalah dosis pupuk kandang yaitu 0, 250, dan 500 g per tanaman, masing-masing perlakuan diulang sebanyak tiga kali. Hasil penelitian menunjukkan bahwa tinggi tanaman, jumlah daun, dan bobot biomassa segar Trichantera gigantea tertinggi dicapai pada perlakuan naungan 72% dan dosis pupuk kandang 250 g per tanaman, berturut-turut sebesar 64.25 cm, 60.75 helai, dan 113.50 g per tanaman. Kata kunci: naungan, pertumbuhan, produksi, pupuk kandang, Trichanthera gigantea
Beef Cattle Development Strategy Based on Agricultural By-Products in Lebong Regency Bengkulu Ramon, Erpan; Nurhaita, Nurhaita; Firison, Jhon; Hidayat, Taufik; Ishak, Andi; Efendi, Zul; Rosbarnawan, Ferdy; Tresia, Gresy Eva; Puastuti, Wisri; Sutedi, Endang; Kusumaningrum, Diana Andrianita; Harmini, Harmini; Rahman, Taupik; Yulistiani, Dwi
Jurnal Agripet Vol 25, No 2 (2025): Volume 25, No. 2 October 2025
Publisher : Faculty of Agriculture

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17969/agripet.v25i2.45046

Abstract

Lebong Regency is one of the areas in Bengkulu with very low beef cattle population covering only 0.189% of the total 161,000 heads. Although ongoing government and stakeholder initiatives have aimed to boost smallholder populations, the outcomes remain suboptimal. This study aimed to evaluate the potential and formulate strategies to increase the beef cattle population in Lebong Regency. It used a descriptive approach through surveys and interviews involving 40 participants, including 32 smallholder farmers and 8 experts from institutions supporting livestock development in the region. Secondary data from Statistics Indonesia supported the assessment of potential and challenges. Data were analyzed using a SWOT matrix, revealing the potential carrying capacity of 10,319 cattle heads, indicating an opportunity for livestock growth in Lebong Regency. The SWOT analysis positioned the strategy in quadrant III (0.33; -0.19), suggesting a turnaround approach. The recommended development strategy emphasizes enhancing knowledge of integrated technology through collaboration between coffee processing industry owners and rice/corn farmers producing agricultural waste. Additionally, utilizing government programs to increase knowledge, scaling up beef cattle farming, and strengthening institutional cohesion are key strategic actions.
Optimized High-Gain DC-DC Converter for PV Applications Harmini, Harmini; Titik Nurhayati; Supari; Priyo Adi Sesotyo; Satria Pinandita; Ery Sadewa
Andalas Journal of Electrical and Electronic Engineering Technology Vol. 5 No. 2 (2025): November 2025
Publisher : Electrical Engineering Dept, Engineering Faculty, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/ajeeet.v5i2.179

Abstract

Photovoltaic (PV) systems frequently encounter low and fluctuating output voltages, which can significantly impede efficient energy utilization and necessitate more advanced power conversion solutions. Addressing this challenge, the study aims to develop a high-gain DC-DC converter topology that offers stable voltage regulation, making it suitable for PV applications. The proposed solution targets the essential need for substantial voltage boosting while maintaining reliable performance even under varying solar irradiance conditions. The core of the design is based on a Quadratic Boost Converter (QBC) integrated with Voltage Multiplier Cells (VMC), collectively referred to as QBC-VMC. This innovative configuration enhances the voltage gain capability compared to traditional converters. To ensure precise control of the output voltage, a Proportional-Integral (PI) controller is implemented. The system undergoes thorough analysis, including detailed modeling, simulation, and the design of its control structure, to optimize performance. The results demonstrate that the proposed converter can achieve a voltage gain of up to 12 times the input voltage. The PI controller effectively maintains a stable output voltage at approximately 600 V with a tolerable variation of ±0.7%. Additionally, the system exhibits an energy conversion efficiency approaching 81%, even under fluctuating irradiance conditions. This indicates a strong dynamic response and steady-state performance, essential for reliable PV operation. By integrating QBC-VMC with PI control, the proposed approach significantly enhances voltage stability and energy conversion efficiency. Overall, this system provides a promising solution for high-performance PV power systems, capable of delivering reliable power output under varying environmental conditions.
Competitiveness of Indonesian Essential Oil Exports in the Chinese Market and Rival Countries Dalimunthe, Nina Rahmida; Rosiana, Nia; Rifin, Amzul; Harmini, Harmini
Agro Bali : Agricultural Journal Vol 8, No 3 (2025)
Publisher : Universitas Panji Sakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37637/ab.v8i3.2361

Abstract

Indonesia is one of the world’s largest producers of essential oils; however, its export competitiveness in the Chinese market has fluctuated over time. This study aims to analyze the level and dynamics of Indonesia’s essential oil export competitiveness compared to other major exporting countries in the Chinese market. The research uses secondary time-series data from 2011 to 2023 obtained from Trade Map. Competitiveness is assessed using the Revealed Comparative Advantage (RCA) and Dynamic Revealed Comparative Advantage (DRCA) methods. The findings reveal that Indonesia generally demonstrates strong competitiveness, except in 2011 when it was weak and in 2022 when it was moderate. Based on DRCA, Indonesia was classified as a “rising star” in 2011–2013 and 2017–2019, a “falling star” in 2013–2015, a “lost opportunity” in 2019–2021, and experienced a decline to the “lagging retreat” position in 2015–2017 and 2021–2023. These fluctuations are influenced by unstable production, limited product innovation, and quality standards that do not fully align with market requirements. To strengthen its competitiveness, Indonesia must enhance product quality, adopt technological innovations, and foster collaboration among stakeholders.
Co-Authors Ake Wihadanto Alfi Nurdina Amzul Rifin Ardie Ariyono Ardie Ariyono Aryadi, Ricky Bambang Haryanto Bayu Krisnamurthi Cahyo, Mukti Dwi Dalimunthe, Nina Rahmida Derman, Derman Diana Andrianita Kusumaningrum, Diana Andrianita Dwi Utami, Anisa Dwi Yulistiani Efendi, Zul Endang Sutedi Erna Wahdiana Ery Sadewa Farah Ratih Farah Ratih Fariyanti, Anna Ferry Firmawan Feryanto willcharo Firison, Jhon Fitriyan, Moh Tamam Edy Hardja, Adiva Fitri Khalishah Tjiptara Harianto Harianto Harianto Harianto Herawati Herawati I.G.P. Wigena Ishak, Andi Iwan Herdiawan Juniar Atmakusuma Juniar Atmakusuma Juniar Atmakusuma Khairil Anwar Kristiani, Mikha Lailandra, Andjani Lalu Hendri Setiawan Lestari, Puspita Mardika M. A. Firmansyah M. A. Firmansyah Mudjiastuti Handajani Muhammad Fadhil Adinugroho Muhammad Fadhil Adinugroho Muthmainnah Firdausa, Mutiara Netti Tinaprilla Novi Anggraini Nunung Kusnadi Nurhaita Nurhaita Prabawa Eka Soesanta Priyo Adi Sesotyo Puspito, Sigit Putra, Aditya Perdana Putri, Tursina Andita Ramon, Erpan Ratna Winandi Ratna Winandi Asmarantaka Ratna Winandi Asmarantaka Rita Nurmalina Rosbarnawan, Ferdy Rosiana, Nia Satria Pinandita Soraya Astia Putri Sri Heranurweni Subowo Subowo Subowo Subowo Suharno Suharno Supari Supari Supari, Supari suparman suparman Suparman Suparman Supratman Supratman, Supratman Suprehatin Suprehatin Suryana, Anggita Tresliyana Tarigan, Anita Carolin Aprilia Taufik Hidayat Taupik Rahman Titik Nurhayati Titik Nurhayati Tresia, Gresy Eva Veronica do Carmo da Silva Vinami Yulian Wahyu Adi Nugroho Wardi Wardi Wigena, I.G.P. Wisri Puastuti Yanti Nuraeni Muflikh Yanuar, Rahmat Yusman Syaukat