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All Journal Physics Student Journal Jurnal EECCIS Journal of Environmental Engineering and Sustainable Technology Erudio: Journal of Educational Innovation Natural B Jurnal Penelitian Pendidikan IPA (JPPIPA)
Didik Rahadi Santoso
Jurusan Fisika Fakultas MIPA Universitas Brawijaya
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Physics

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IDENTIFIKASI STRUKTUR BAWAH PERMUKAAN DI DAERAH PANASBUMI KASINAN, KOTA BATU, BERDASARKAN METODE GAYABERAT DAN SUHU Sutasoma, Muwardi; Maryanto, Sukir; Santoso, Didik Rahadi
Physics Student Journal Vol 2, No 1 (2014)
Publisher : Department of Physics - Faculty of Science

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Abstract

Study on geothermal potential in Kasinan, Batu City has been conducted based on gravity method. The aimed of this study is to determine subsurface structure in this field. Data acquisition has performed in 95 point around the location. The study was conducted to obtain  Bouguer anomaly and residual anomaly. Upward continuation method performed to gain residual and regional anomaly values. Two types of cross-section modeling have been carried from local anomaly value : AA’ and BB’ trajectories.The depth of below surface modeling is 2000 meters. The results of modeling confirmed that the rock types compotition on AA’ and BB’ trajectory are andesite, tuff, and Lava.
Rancang bangun Vibration Exciter Sederhana Untuk Uji Respon Frekuensi Sensor MEMS Accelerometer Nuraidha, Amalia Cemara; Santoso, Didik Rahadi; Nadhir, Ahmad
Physics Student Journal Vol 2, No 1 (2014)
Publisher : Department of Physics - Faculty of Science

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Abstract

Vibration Exciter merupakan suatu alat yang dapat menghasilkan getaran mekanik dengan nilai frekuensi yang dapat diatur. Salah satu fungsi alat ini yaitu, untuk menguji respon frekuensi sebuah sensor getaran. Penelitian ini bertujuan untuk mendesain dan membuat sebuah Vibration Exciter simple yang akan digunakan untuk menguji respon frekuensi sensor MEMS Accelerometer. Alat ini dirancang dengan menggunakan motor DC sebagai sumber getaran mekanik, merubah gerak rotasi menjadi translasi. Selain itu alat ini mampu menghasilkan getaran dengan nilai frekuensi yang dapat diprogram sesuai dengan kebutuhan.  Hasil penelitian menunjukkan bahwa Vibration Exciter ini mampu bekerja pada frekuensi 0.2 Hz hingga 9 Hz tanpa adanya beban sensor, dan mampu bekerja pada frekuensi 0.7 Hz hingga 8.5 Hz dengan adanya sensor sebagai beban, dengan beban sensor kurang lebih 250 gram.
Electrical Impedance Value Analysis on Formalinized Tilapia Fish Meat Putri, Rizka Rahmatie Agusta; Widodo, Chomsin Sulistya; Santoso, Didik Rahadi
Natural B, Journal of Health and Environmental Sciences Vol 3, No 4 (2016)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (587.615 KB) | DOI: 10.21776/ub.natural-b.2016.003.04.3

Abstract

Electrical impedance can be used as a non-destructive method to determine the bio-electrical characteristics on biological materials. Analysis of the electrical impedance value by using an electrode needle method has been applied to the tilapia flesh which aims to determine the bio-electrical characteristics on tilapia flesh, and determine the effect of formalin on it. The measurements were carried out to compare the characteristics of bio-electrical characteristics of the fresh tilapia flesh, the tilapia flesh soaked in formalin, and the one that was lay without any preservation treatment at a 10 Hz - 200 kHz frequency. The result shows that the impedance value characteristics of the fresh tilapia flesh decreased as long as the increase of frequency. Both the preserved and the rotten tilapia flesh have the decreased impedance value. The concentration of formalin immersion is directly proportional with the value of electrical impedance.  
Desain dan Pembuatan Resistor Shunt Ohmik Rendah dan Aplikasinya Sebagai Elemen Pengukuran Arus Tinggi Impulse, 8/20????s Jacob Jonas Rikumahu; Didik Rahadi Santoso; Rini Nur Hasanah; Moch. Dhofir
Jurnal EECCIS Vol 7, No 1 (2013)
Publisher : Fakultas Teknik, Universitas Brawijaya

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Abstract

Dalam penelitian ini dikaji perancangan dan pembuatan resistor shunt ohmik rendah tipe koaksial sangkar bajing. Penelitian dititikberatkan pada pemilihan material dan pembuatannya dengan tujuan mengurangi efek kapasitansi dan induktansi dari resistor shunt pada frekuensi arus tinggi impulse 8/20 s. Hasil pengujian atas respon frekuensi menunjukkan bahwa pada frekuensi rendah tegangan jepit resistor shunt adalah rendah, dan tegangan ini akan menjadi relatif stabil pada frekuensi tinggi (sekitar 8 MHz). Sementara itu, hasil uji respon transien dari resistor shunt menunjukkan kesesuaian antara hasil pengukuran dengan teori dan perhitungan. Pada uji dengan generator impulse arus tinggi didapatkan hasil karakteristik arus impulse yang cukup baik. Kurva arus 8/20????s dapat diukur dengan baik pada nilai 8,25/20,06????s, dan puncak arus terukur sekitar 2,57kA, yang berdasarkan perhitungan nilainya adalah 3,08kA.Kata Kunci— Desain, Pengukuran, Arus Tinggi Impulse
IDENTIFICATION OF KAWI-SONGGORITI GEOTHERMAL PROSPECTS BASED ON FAULT AND FRACTURE DENSITY (FFD) Nur Aini Gama Lestari; Sukir Maryanto; Didik Rahadi Santoso
Journal of Environmental Engineering and Sustainable Technology Vol 7, No 2 (2020)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jeest.2020.007.02.2

Abstract

The aim of this research is to identify the surface structures of geothermal area in Kawi-Songgoriti based on lineament density and surface manifestation. The lineament density is processed by using satellite image as the input data. The surface structures were analyzed through the density of lineaments on the surface with FFD method. The lineaments are assumed associated with fractures or faults found in geothermal areas those are generally covered by surface manifestation which are hard to be identified. These faults and fractures were assumed as weak line that act as fluid thermal movement, thereby it can be used as guidance for the location of permeable area or a reservoir.  As a result, the high lineament density can be found in Kawi thus assumed as the control of Songgoriti manifestation.
PEMANFAATAN ALAT PERAGA UNTUK PROSES PEMBELAJARAN FISIKA DI SLTA (Studi Persepsi Guru-guru Fisika SLTA di Kabupaten Lombok Timur) Gancang Saroja; Ahmad Nadhir; Sukir Maryanto; Didik Rahadi Santoso; Setyawan P. Sakti
Erudio Journal of Educational Innovation Vol 2, No 2 (2014): ERUDIO (JOURNAL OF EDUCATIONAL INNOVATION)
Publisher : Universitas Brawijaya

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Abstract

Proses pembelajaran ilmu Fisika akan lebih menarik dan mudah dipahami siswa jika didukung dengan kegiatan praktikum dan eksperimen di laboratorium. Terkait dengan keterbatasan sarana laboratorium sekolah di SLTA Kabupaten Lombok Timur, Tim Pengabdian  jurusan Fisika UB melakukan kegiatan pelatihan pembuatan alat peraga fisika bagi para guru-guru fisika.Dalam penelitian ini dilakukan studi persepsi, dimana kepada para peserta diberikan angket sebelum dan setelah kegiatan. Kriteria-kriteria yang digunakan adalah pengukuran tingkat relevansi materi kegiatan yang di sampaikan terhadap kebutuhan guru, pengukuran tingkat kepuasan dari guru yang berperan sebagai peserta, serta umpan balik dan saran dari guru peserta pada tim pengabdianHasil studi menyatakan bahwa materi kegiatan sangat relevan terhadap kebutuhan guru-guru anggota MGMP Fisika di Kabupaten Lombok Timur. Selain itu, para peserta menyatakan bahwa kegiatan sangat memberikan manfaat bagi proses pembelajaran fisika. Sebagai umpan balik, peserta berharap adanya kegiatan yang sama di Lombok Timur dengan durasi waktu kegiatan yang lebih panjang. 
2D Imaging Technique Electrical Impedance Distribution on Liquid with Paired Method and Using EIDORS Software Ahmad Zarkasi; Abdurrouf Abdurrouf; Didik Rahadi Santoso
Natural B, Journal of Health and Environmental Sciences Vol 4, No 1 (2017)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (874.679 KB) | DOI: 10.21776/ub.natural-b.2017.004.01.5

Abstract

This paper discusses the 2D imaging technique of the electrical impedance distribution in the liquid by using the principles of Electrical Impedance Tomography (EIT).  A tomographic technique used in the imaging process is a adjacent or neighbor method, with input data obtained from measurements of the electrical potential at the boundary measuring object. Measurement data is reconstructed using open source software, i.e. EIDORS, which in image reconstruction using the principle of Finite Element Method (FEM). As a comparison on the results of image reconstruction by EIDORS, here used Boundary Data Simulation (BDS) were obtained from the same measurement data. Based on the results of the 2D images that have been obtained, it is evident that the techniques and imaging methods that have been used are able to show the distribution of electrical impedance value of the measuring object and have a good agreement with the results of BDS.  
Radiation Effects on Decreased Estrogen with Isoflavone Consumption to Prevent Early Menopause in Radiation Therapy Yeni Cahyati; Didik Rahadi Santoso; Unggul P Juswono
Natural B, Journal of Health and Environmental Sciences Vol 2, No 2 (2013)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1456.776 KB) | DOI: 10.21776/ub.natural-b.2013.002.02.2

Abstract

Radiation effect is one of which is the reduction in estrogen. Gamma rays are ionizing radiation that can lead to cell damage due to free radicals produced when the radiation interacts with cells. The level of cell damage can be minimized by antioxidants. Antioxidants used is the isoflavones of soy milk, so it can be know the effects of radiation on the decline in estrogen that accompanied the consumption of isoflavones to prevent early menopause in radiation therapy.Radiation exposure are given fractionally. The dose was 1,5 Gy in once exposure and given every 3 days up to a maximum dose of the treatment groups. Consumption of soy milk to the mice done orally. Blood was drawn and serum was made. Serum estrogen levels will be tested by using ELISA.The results showed that the ovarium disfunction and stress experienced by mice (Mus musculus) caused by radiation exposure. Maximum results in the consumption of isoflavones on estrogen levels the subject to radiation exposure is 44 mg/day and 131 mg/day of soy milk. This isoflavone dose increase in estrogen levels maximumly. The increase was the response given by the body's immune system of mice due to start reacting and isoflavones are phytoestrogens.
Analysis of Experimental Results Measurement of Electric Impedance Value on Liquid with Injection Flow on Parallel Plate Gianita Anastasia Salamena; Abdurrouf Abdurrouf; Didik Rahadi Santoso
Natural B, Journal of Health and Environmental Sciences Vol 4, No 1 (2017)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (253.578 KB) | DOI: 10.21776/ub.natural-b.2017.004.01.4

Abstract

This paper discusses the results of experimental measurement of the electrical impedance of liquids in parallel and perpendicular position to the direction of current injection. Experiments carried out on three different types of liquid i.e. distilled water, mineral water, and milk. Each liquid is placed in a container box with volume of 2,5cm x 2,5cm x 2,5cm. The electrode is located in the middle of the upright side of the container, forming two pairs of parallel plates, where one pair of parallel plate will serve as the current electrode. Current signal frequency range used in this experiment is 1Hz-500Hz. Experimental results obtained some things such as each liquid has a different electrical characteristic, distilled water has much larger electrical impedance compared to the mineral water and milk. Area of the electrode affects the measured impedance values on each liquid; the larger area of the electrode will decrease impedance value. The position of the electrode against the direction of flow injection showed the difference in impedance values measured, where the impedance measured at liquid injection electrode direct current is greater than the value of the impedance measured at liquid electrodes perpendicular injection current.
The Relationship Between Honey's Floral Origins and The Electrical Impedance of Honey Variants Vivien Dwi Indriyani; Didik Rahadi Santoso; Chomsin Sulistya Widodo
Natural B, Journal of Health and Environmental Sciences Vol 4, No 4 (2018)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (257.875 KB)

Abstract

One of the factors that influence the composition of honey is the plant that became the source of nectar. Honey derived from one plant species has a different composition with honey from other plant species. This study aims to analyze the effect of the origin of honey flower on the value of electrical impedance by using impedance spectroscopy and to analyze the relationship between ash content and electrical impedance in honey. This study used four gold needle electrodes and a set of PicoScope 5244B tools to measure the value of honey impedance. Measurements are made by injecting a current of 10 μA and using frequencies 1 Hz to 2 MHz. This study also measured ash content in honey. The sample used is kelengkeng, kaliandra, randu, coffee, and rubber honey. The results showed that the origin of honey flower affects the value of electrical impedance. The relationship between impedance and ash content is the smaller the ash content in honey the impedance value is greater.
Co-Authors abdurrouf Abdurrouf Ahmad Nadhir Ahmad Zarkasi Amalia Cemara Nuraidha, Amalia Cemara Arinto Yudi Ponco Wardoyo Chomsin Sulistya Widodo Chomsin Sulistya Widodo Chomsin Sulistya Widodo Ferhiyan Nabila Gancang Saroja Gianita Anastasia Salamena Jacob Jonas Rikumahu Moch. Dhofir Muwardi Sutasoma Nur Aini Gama Lestari Rini Nur Hasanah Rizka Rahmatie Agusta Putri Setyawan P. Sakti Setyawan Purnomo Sakti Sukir Maryanto Ummu Hidayati Mardiyah Unggul P Juswono Unggul P. Juswono Unggul Pundjung Juswono Vivien Dwi Indriyani Wira Dian Jauharah Yeni Cahyati