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All Journal Alchemy : Journal of Chemistry JFA (Jurnal Fisika dan Aplikasinya) Titian Ilmu: Jurnal Ilmiah Multi Sciences PENDIPA Journal of Science Education JMM (Jurnal Masyarakat Mandiri) Jurnal Kumparan Fisika Dharma Raflesia : Jurnal Ilmiah Pengembangan dan Penerapan IPTEKS JIFP (Jurnal Ilmu Fisika dan Pembelajarannya) Jurnal Pengabdian Masyarakat Bangsa JAMAS: Jurnal Abdi Masyarakat Jurnal Laboratorium Sains Terapan

Refpo Rahman

Program Studi D3 Laboratorium Sains, Universitas Bengkulu

Author-ID : 3305692

Agriculture, Biological Sciences & Forestry Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Education Energy Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Design and Manufacturing Audio Bioharmonic Technology with Manipulate Peak Frequencies for Crop Field Refpo Rahman
Jurnal Fisika dan Aplikasinya Vol 17, No 3 (2021)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v17i3.9715

Applied physics can be involved and integrated with various fields of science. Sonic bloom technology by utilizing sound waves in fact can increase plant growth. This research is the development of the audio bioharmonic (ABH) device to create an efficient, practical, and easy-to-use for farmers. The design and manufacturing of an ABH device based on an Arduino UNO Atmega 328p with manipulated frequencies have been done. The original sound source of Garengpung (Dundubia Manifera) was manipulated around the range of 3000-5000 Hz and the frequency spectrum was calculated using Fast Fourier Transform (FFT) analysis. The results show that the peak frequencies obtained are 3241, 4167, and 4963 Hz as the sound sources of mp3 files. Furthermore, the ABH device was validated by comparing the results of the FFT analysis of the sound source of the mp3 files with the sound recording of the ABH device. As the result, the deviations of the peak frequency obtained are 259, 140, and 172 Hz. And the last, the sound pressure levels (SPL) of audio bioharmonic output at different frequencies are measured using a sound level meter in real-time for 30 minutes. All frequencies have stable SPL at 80-100 dB.

Studi probabilitas transmisi dan karakteristik IV pada molekul DNA G4 Refpo Rahman; Efta Yudiarsah
PendIPA Journal of Science Education Vol 4, No 2 (2020): MARCH - JUNE
Publisher : University of Bengkulu

[The study of transmission probability and IV chracteristics of a G4 molecule] In this era, there have been many theoretical and experimental studies conducted to enhance technological development. The development of technology continues to grow rapidly with electronic components that are getting smaller towards nano. Nanotechnology is becoming increasingly interesting because it can be created through DNA that is found in either the human body or other living things. This research was conducted to study DNA transport properties by calculating transmission probabilities and I-V characteristics. The DNA studied is DNA that has been modified consisting of 4 guanine bases arranged stacked to form a square called G4-DNA. G4-DNA is composed by having 32 base pairs and connected by electrodes at the end. The transport properties of G4-DNA were studied using the Hamiltonian tight binding approach. Transmission probability is calculated using the method of the Green Function Hamiltonian to determine the possibility of electrons flowing along the DNA pathway. This transmission probability is used in determining the I-V Characteristics based on the Landauer Büttiker formula. The results are obtained that the electron transport process along the G4-DNA molecule is an increase in current to high voltage. The effects of I-V characteristics are seen by affecting the twisting motion frequency up to 5.12 meV which is a significant increase in current. The results of this study can provide information about the characteristics of DNA that can be applied in the future in manufacture of nanotechnology device.

PENINGKATAN PENGETAHUAN MASYARAKAT DALAM MERANCANG PEMBANGKIT LISTRIK TENAGA SURYA SKALA RUMAH SEDERHANA Refpo Rahman; Heriansyah Heriansyah; Ahmad Syarkowi; Ridha Rizki Novanda; Umi Salamah; Helfi Eka Saputra
JMM (Jurnal Masyarakat Mandiri) Vol 5, No 6 (2021): Desember
Publisher : Universitas Muhammadiyah Mataram

Abstrak: Desa Rindu Hati memiliki indeks GHI (Global Horizontal Irradiation) sebesar 4,54 KWh/m2 yang cukup potensial menerapkan pembangkit listrik tenaga surya (PLTS). Permasalahan yang sering dialami masyarakat desa yaitu saat terjadi mati lampu menyebabkan aktivitas masyarakat terganggu pada malam hari serta tidak adanya lampu emergency yang dapat menerangi jalan jika pemadaman listriknya cukup lama. Sehingga, perlu upaya untuk memecahkan permasalahan tersebut dengan memanfaatkan potensi desa yang memiliki kelimpahan sumber cahaya matahari dengan cara mengubah cahaya matahari menjadi energi listrik. Pelaksanaan kegiatan pengabdian berbasis IPTEKS ini dilakukan pada kelompok masyarakat sadar wisata (Pokdarwis) Desa Rindu Hati, Kabupaten Bengkulu Tengah, Provinsi Bengkulu. Kegiatan ini dilakukan melalui beberapa tahapan antara lain survey lokasi, studi literatur, pelaksanaan sosialisasi dan evaluasi (analisis kuisioner). Hasil post-test yang disebar kepada masyarakat memperlihatkan bahwa hampir 100% masyarakat memiliki minat yang tinggi dan ingin mengaplikasikan perancangan PLTS skala rumah sederhana dilingkungan mereka. Abstract: Rindu Hati Village has a GHI (Global Horizontal Irradiation) index of 4.54 KWh/m2 which is quite potential to implement solar power generation. Problems that are often experienced by the community when there is a blackout cause people's activities to be disrupted at night and there are no emergency lights that can illuminate the road if the power outage is long enough. Thus, efforts are needed to solve these problems by utilizing the potential of villages that have an abundance of sunlight sources by converting sunlight into electrical energy. The implementation of this science and technology-based service activity was carried out at the pokdarwis of Rindu Hati village, Central Bengkulu Regency, Bengkulu Province. Early activities are carried out through several stages, including site surveys, literature studies, implementation of socialization and evaluation (questionnaire analysis). The results of the post-test that were distributed to the community showed that almost 100% of the people had a high interest and wanted to apply the design of a simple house-scale solar power generation in their environment.

DESAIN DAN PERANCANGAN INSTRUMEN MONITORING KEKERUHAN AIR DENGAN SISTEM REAL TIME CLOCK (RTC) Refpo Rahman; Fades Br. Gultom
Jurnal Kumparan Fisika Vol. 5 No. 1: April 2022
Publisher : Unib Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jkf.5.1.23-30

ABSTRAK Instrumen monitoring tingkat kekeruhan air dapat dirancang dengan Arduino Uno. Modul turbidity sensor dan modul RTC DS3231 digunakan untuk mengukur tingkat kekeruhan air secara real time yang hasil pengukuran tersimpan otomatis di dalam SD card. Instrumen tingkat kekeruhan air ini dapat digunakan dalam pengukuran tingkat kekeruhan air tanpa harus tersambung dengan sumber listrik PLN karena menggunakan baterai dengan kapasitas yang besar yaitu 2200 mAh. Berdasarkan desain yang telah dirancang, terdapat beberapa port pada instrumen seperti connector arduino ke PC, adabtor DC 12 V dan slot SD card. Terdapat dua langkah pengujian diterapkan antara lain pengujian alat untuk dikalibrasi dan pengujian tingkat kesalahan relatifnya. Berdasarkan hasil pengujian pertama diperoleh persamaan fungsi y = -104,17 x2 + 431,83x + 2 yang digunakan untuk kalibrasi alat sesuai dengan alat standar turbiditimeter 2100. Selanjutnya, melakukan perhitungan kesalahan relatif alat instrumen. Hasilnya, instrumen monitoring kekeruhan air ini dapat mengukur tingkat kekeruhan air pada rentang 50-500 NTU dengan tingkat kesalahan sebesar 1.67%. Kata kunci : Arduino Uno, DS3231, turbidity sensor, real time clock ABSTRACT The instrument for monitoring the level of water turbidity can be designed with the Arduino Uno. The turbidity sensor module and DS3231 RTC module are used to measure the turbidity level of the water in real time. The measurement results are stored automatically in the SD card. This water turbidity level instrument can be used in the field without having to be connected to a PLN electricity source because it uses a battery with a large capacity of 2200 mAh. Based on the design that has been designed, there are several ports on the instrument such as an Arduino to PC connector, adapter of 12 V DC and SD card slot. There are two testing steps applied, including testing to be calibrated and testing its relative error rate. Based on the results of the first test, the equation of the function y = -104.17 x2 + 431.83x + 2 is obtained which is used for calibration of the instrument according to the standard tool of turbiditimeter 2100. The second, calculate the relative error of the instrument. As a result, this water turbidity monitoring instrument can measure the level of water turbidity in the range of 50-500 NTU with an error rate of 1.67%. Keywords—Arduino Uno, turbidity sensor, real time clock, modul RTC DS3231

Uji Alat Kekeruhan Air Menggunakan Turbidity Sensor Berbasis Arduino Refpo Rahman
Jurnal Ilmu Fisika dan Pembelajarannya (JIFP) Vol 5 No 1 (2021): Jurnal Ilmu Fisika dan Pembelajarannya (JIFP)
Publisher : Program Studi Pendidikan Fisika, UIN Raden Fatah Palembang

The water turbidity tester has designed using a turbidity sensor based on Arduino Uno to measure water turbidity levels. Testing the instrument is divided into two stages. The first stage, calibration testing using five samples symbolized by sample A-E. This sample is measured to obtain the voltage output from the water turbidity tester and the water turbidity level (NTU) from the standard tool. The results have obtained sample A (4.17 V and 3.014 NTU), sample B (4.066 V and 43.02 NTU), sample C (3.864 V and 225 NTU), sample D (3.798 V and 312 NTU), and sample E (2.49 V and 3000 NTU). This measurement value is used to calibrate the water turbidity level. In the second stage, the calibrated tools are re-tested with NTU output data. This measurement is used to calculate the relative error by comparing the data. The result shows that the smallest error rate when measuring the sample is> 220 NTU with an error rate below 10%. Meanwhile, the largest error rate when measuring water turbidity is <220 NTU with an error rate of above 10% to 100%. Keyword: Arduino Uno; Turbidity Sensor; water turbidity tool.

Analisis Tingkat Kebisingan di Sekitar Gerbang Kampus Universitas Bengkulu Fades Br Gultom; Refpo Rahman; Heriansyah Heriansyah
Jurnal Ilmu Fisika dan Pembelajarannya (JIFP) Vol 6 No 1 (2022): Jurnal Ilmu Fisika dan Pembelajarannya (JIFP)
Publisher : Program Studi Pendidikan Fisika, UIN Raden Fatah Palembang

The purpose of this study was to determine the level of noise that occurred around the entrance and exit gates of the south and west of Bengkulu University. Noise level measurements will be carried out using a sound level meter type GM 1356 with a measurement range between 30-130 dB(A) or 35-130 dB(C). The research method used a descriptive analysis with data collection techniques by systematic purposive sampling. Sound intensity data at the entrance and exit of the south and west gates were recorded in the time range 7.00-7.30, 7.30-8.00, 8.00-8.30, 11.15-11.45 and 13.00-13.30 WIB for four days. The results showed that the equivalent sound pressure level during the day (Ls) was 64.98 dBA, 66.47 dBA, 65.2 dBA, 63.69 dBA. The data shows a decrease in sound intensity in the time range of 8.00-8.30 WIB, which is 56.1 dBA. The average data has exceeded the threshold value of school noise quality standards and the like, which is 55 dBA. So it is necessary to take countermeasures to anticipate the emergence of communication, hearing and psychological disorders in both the campus community and the community outside the campus.

Peningkatan Hasil Panen Tomat di Desa Sambirejo Dengan Penerapan Teknologi “Sonic Bloom” Refpo Rahman; M Adeng Fadila; Helfi Eka Saputra; Ridha Rizki Novanda; Umi Salamah; Ahmad Syarkowi; Kiky Nurfitri Sari; Andika Prawanto
DHARMA RAFLESIA Vol 18, No 2 (2020): DESEMBER (ACCREDITED SINTA 5)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/dr.v18i2.13242

Desa Sambirejo merupakan salah satu sentra produksi tanaman tomat. Pengaruh cuaca saat ini memberikan dampak yang buruk terhadap hasil produksi tomat. Karena tanaman tomat merupakan tanaman yang mudah diserang penyakit sehingga hasil panennya mengalami fluktuatif. Melalui penerapan teknologi sonic bloom dapat menambah pengetahuan, dan keterampilan serta dapat menjadi solusi pemecahan masalah dalam meningkatkan hasil panen petani. Teknologi sonic bloom merupakan gelombang suara berfrekuensi 3.500 – 5.000 Hz. Gelombang tersebut dapat merangsang pembukaan stomata tanaman sehingga penyerapan pupuk daun meningkat. Penerapan teknologi ini dapat meningkatkan produktivitas tanaman tomat yang lebih baik. Hasilnya batang lebih tinggi, buah jauh lebih besar dan jumlah buah tomat lebih banyak dibandingkan dengan tanaman tomat jauh dari sumber suara.

Pengembangan Agrowisata dengan Konsep Design Rainbow Vertical Garden Sederhana di Desa Wisata Rindu Hati Umi Salamah; Muhimmatul Husna; Refpo Rahman; Ridha Rizki Novanda; Ahmad Syarkowi; Helfi Eka Saputra
DHARMA RAFLESIA Vol 19, No 2 (2021): DESEMBER (ACCREDITED SINTA 5)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/dr.v19i2.18408

Rindu Hati merupakan desa yang dinobatkan sebagai desa wisata. Kondisi objek wisata Desa Rindu Hati saat ini membutuhkan pengembangan untuk lebih banyak menarik wisatawan. Penambahan objek wisata juga menjaga agar Desa Rindu Hati tetap menjadi pilihan orang-orang untuk tetap berekreasi. Rainbow Vertical Garden merupakan konsep agrowisata berbentuk taman mini yang berisi bunga berwarna warni yang digantung pada dinding penegak. Tujuan kegiatan pengabdian ini adalah untuk memperkenalkan dan meningkatkan perkembangan kepariwisataan Desa Rindu Hati sebagai Desa Wisata dengan pengembangan objek wisata baru yaitu Rainbow Vertical Garden. Permasalahan yang dihadapi di desa Rindu Hati adalah pengembangan objek wisata belum ada pengembangan agrowisata yang berbasis pertanian di Desa Rindu Hati. Sasaran utama dari program pengabdian pembinaan ini yaitu Pengelola Wisata Desa Rindu Hati dan Perangkat Desa Rindu Hati. Metode yang dilakukan oleh Tim LPPM UNIB ini merupakan konsep baru yang mengacu pada agrowisata dengan memanfaatkan tanaman hias dengan sistem Rainbow Vertical Garden. Hasil dari kegiatan pengabdian ini adalah mengenalkan masyarakat desa Rindu Hati tentang pemanfaatan Vertical Garden dan pengaplikasian Rainbow Vertical Garden dengan lahan vertikal di Desa Rindu Hati sebagai sebagai agrowisata baru.

Peningkatan Keterampilan Produksi VCO pada UMKM Bay Tat Mak Ririn melalui Pemanfaatan Limbah Selai Nanas Gustria Ernis; Apriza Hongko Putra; Refpo Rahman
DHARMA RAFLESIA Vol 19, No 1 (2021): JUNI (ACCREDITED SINTA 5)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/dr.v19i1.13762

Virgin Coconut Oil (VCO) merupakan salah satu alternatif imunostimulan alami yang dapat meningkatkan daya tahan tubuh di tengah pandemi COVID-19. Salah satu enzim yang digunakan dalam pembuatan VCO adalah enzim bromelin. Limbah pengolahan selai nanas berupa kulit dan mata nanas mengandung enzim bromelin yang dapat mempercepat terbentuknya VCO. Metode pengabdian ini adalah dengan memberikan sosialisasi dan pelatihan pembuatan VCO kepada anggota UMKM Bay Tat Mak Ririn. Setelah dilakukan pelatihan, anggota UMKM Bay Tat Mak Ririn berhasil memproduksi VCO melalui pemanfaatan limbah selai nanas. Disamping itu, diperoleh peningkatan produksi VCO menggunakan enzim bromelin yang bersumber dari limbah selai nanas sebesar 1,8% dibandingkan dengan VCO tanpa enzim bromelin. Hal ini menunjukkan bahwa keterampilan peserta dalam memproduksi VCO melalui pemanfaatan limbah selai nanas meningkat.

Analisis Kualitas Air Berdasarkan Parameter Fisika di Wilayah Kota Bengkulu Fades Br. Gultom; Refpo Rahman; Heriansyah Heriansyah
ALCHEMY:Journal of Chemistry Vol 9, No 2 (2021): ALCHEMY JOURNAL OF CHEMISTRY
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/al.v9i2.13517

Water is a source of basic human needs. Clean water quality will affect environmental health and all activities in it. This study aimed to measure the quality of the water around beaches, rivers and swamps near settlements in Bengkulu City. The research location consisted of nine points with a radius of 0-2 km from the beach. Sampling was carried out using the stratified disproportional random sampling method with measured parameters including temperature, total dissolved solids (TDS) and water turbidity. The method used in the data analysis is the STORET scoring system. The samples were tested using TDS and turbidity meter based on the Arduino Uno ATMega 328. Results of temperature measurement showed relatively stable values in the range of 29-30°C; TDS values were 53-565 mg/L and water turbidity levels ranged from 90.8 to 1938.1 NTU. Based on the results of the analysis using the STORET scoring system, the water quality status in the study area was included in the medium polluted category (score -15) of 3 test parameters (temperature, TDS and water turbidity). Keywords: Water quality, physical parameter, STORET method, Bengkulu City Air merupakan sumber kebutuhan dasar manusia. Kualitas air yang bersih akan mempengaruhi kesehatan lingkungan dan seluruh aktivitas didalamnya. Tujuan penelitian ini adalah untuk mengukur kualitas air yang ada di sekitar pantai, sungai dan rawa dekat pemukiman di Kota Bengkulu. Lokasi penelitian terdiri dari 9 titik dengan radius 0-2 km dari pinggir pantai. Pengambilan sampel dilakukan dengan menggunakan metode stratified disproportional random sampling dengan parameter yang diukur diantaranya suhu, total dissolved solids (TDS) dan kekeruhan air. Metode yang digunakan dalam analisis data yaitu sistem penilaian STORET. Pengujian sampel dilakukan dengan TDS meter dan turbidity meter berbasis Arduino Uno ATMega 328. Hasil pengukuran suhu menunjukkan nilai yang relatif stabil dengan kisaran 29-30°C; nilai TDS antara 53-565 mg/L dan tingkat kekeruhan air pada rentang 90,8-1938,1 NTU. Berdasarkan hasil analisis menggunakan sistem penilaian STORET, status mutu air di wilayah penelitian termasuk pada kategori cemar sedang (skor -15) berdasarkan 3 parameter uji (suhu, TDS dan kekeruhan air). Kata kunci: Kualitas air, parameter fisika, metode STORET, Kota Bengkulu

Co-Authors Agwil, M. Winalia Ahmad Syarkowi Ahmad Syarkowi Al Fadhil, Maulana Jordan Ananda, Aditya Rizki Andika Prawanto Apriza Hongko Putra Arif, Prasetya Ariffiando, Nady Febri Azzahra, Fatty Cantika Barchia, Faiz Edis Ariesta Efta Yudiarsah, Efta Ernis, Gustria Fades Br Gultom Fades Br. Gultom Febri Ariffiando, Nady Florenza, Widya Gustria Ernis Helfi Eka Saputra Hendrawan, Faiz Rasyid Heriansyah Heriansyah Heriansyah Husna, Muhimmatul Kiky Nurfitri Sari Komalasari, Delia kurniawan, aditya dwi Lutvi Fitriani M Adeng Fadila Megdiansya, Kelvin Muhammad Yusuf Muhimmatul Husna Nola Windirah Notriawan, Doni Novanda, Ridha Rizki Nurjali, Zavira Putri, Naila Mahya Ratu, Septika Ridha Rizki Novanda Ridha Rizki Novanda Saharani, Ayu Rahmi Saputra, Ismed Sopian, Mochamad Tito Ardiansyah Triani, Lensi Agus Triawan, Deni Agus Ulfah Anis Umi Salamah

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