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All Journal Jurnal Simetris Kinetik: Game Technology, Information System, Computer Network, Computing, Electronics, and Control Elektrika Technologia: Jurnal Ilmiah Prosiding Konferensi Nasional PKM-CSR SmartComp Tematik Jurnal Ecotipe (Electronic, Control, Telecommunication, Information, and Power Engineering)
Harmini Harmini
Teknik Elektro, Universitas Semarang
Humanities Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Nursing Public Health Social Sciences

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DESAIN GENERATOR OZONE DENGAN TEKNOLOGI PLASMA DBD (Die-lectric Barrier Discharge) Ricky Aryadi; 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) Mukti Dwi Cahyo; Sri Heranurweni; 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; Titik Nurhayati
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) Moh Tamam Edy Fitriyan; Sri Heranurweni; 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 %.
PELATIHAN PENYUSUNAN MEDIA PEMBELAJARAN ONLINE UNTUK MENINGKATKAN KUALITAS PEMBELAJARAN GURU SMPN 23 SEMARANG Harmini Harmini; Titik Nurhayati
TEMATIK Vol. 1 No. 2 (2021): Juli
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/tmt.v1i2.3520

Abstract

Guru dituntut mampu merancang dan mendesain pembelajaran daring yang ringan dan efektif, dengan memanfaatkan perangkat atau media daring yang tepat dan sesuai dengan materi yang diajarkan. Walaupun dengan pembelajaran daring akan memberikan kesempatan lebih luas dalam mengeksplorasi materi yang akan diajarkan, namun guru harus mampu memilih dan membatasi sejauh mana cakupan materinya dan aplikasi yang cocok pada materi dan metode belajar yang digunakan Saat ini para guru di SMPN 23 Semarang hanya menggunakan media Whatapps untuk berkomunikasi dengan para siswa dan orang tua siswa, pembelajaran dilakukan dengan memberikan lewat materi yang telah dirangkum oleh guru kepada siswa, selanjutnya memberikan tugas yang harus dikerjakan oleh siswa. Para guru ini mengharapkan adanya pelatihan bagaimana menggunakan aplikasi e-learning seperti edmodo, google classroom atau Microsoft tems, serta bagaimana memberikan penjelasan kepada siswa melalui video conference seperti zoom atau google meeting.Permasalahan yang dihadapi oleh para guru SMPN 23 Semarang sebenarnya sama dengan yang dihadapi oleh pada Guru di seluruh Indonesia, yaitu bagaimana menggunakan dan memilih peralatan model pembelajaran e-learning yang tepat untuk para siswa, bagaimana membuat media pembelajaran yang interaktif dan informative kepada para siswa. Tujuan dari penggunaan media pembelajaran yang tepat akan memudahkan siswa menerima pelajaran yang diberikan. Kesulitan para guru adalah karena belum dilatih mengunakan peralatan untuk model pembelajaran jarak jauh, sehingga perlu tambahan dukungan dan mentoring untuk menyesuaikan dengan model pembelajaran baru ini.Solusi yang ditawarkan untuk menyelesaikan permasalahan mitra adalah memberikan pelatihan kepada Guru SMPN 23 Semarang tentang (1) bagaimana menggunakan peralatan model pembelajaran e-learning seperti penggunaan edmodo, (2)memberikan pelatihan bagaimana membuat power point yang bisa merekam suara guru saat memberikan penjelasan sehingga pembelajaran menjadi lebih interaktif dan informatif. Pelatihan dilaksanakan dengan waktu selama 2 jam. Luaran lain yang dihasilkan adalah jurnal Pengabdian kepada Masyarakat, HAKI Hasil Pengabdian Kepada Masyarakat, publikasi video pelaksanaan Pengabdian melalui Youtube.
Co-Authors Derman Derman Dias Widodo Elfira Nureza Ardina Feby Agung Pamuji Iswoyo Iswoyo Mochamad Ashari Moh Tamam Edy Fitriyan Muhammad Sipan Mukti Dwi Cahyo Ricky Aryadi Sri Heranurweni Supari Supari Titik Nurhayati Titik Nurhayati