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All Journal Physics Student Journal JST ( Jurnal Sains Terapan ) Majamecha Jurnal Pengabdian kepada Masyarakat Nusantara Jurnal Teknosains Kodepena (Kodepena Journal of Technoscience) Journal of Computer, Electronic, and Telecommunication (COMPLETE) Jurnal Teknosains Kodepena (Kodepena Journal of Technoscience) Indonesian Journal of Chemistry and Environment Journal Of Human And Education (JAHE) Indonesian Research Journal on Education Petrogas : Journal of Energy and Technology
Fitri Oktafiani
Sekolah Tinggi Teknologi Migas
Religion Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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Pengaruh Radiasi Gamma Terhadap Jumlah Leukosit, Prosentase Limfosit pada Organ Limfoid dan Histologi Hepar Mencit (Mus muculus) yang Telah Diberi Ekstrak Meniran (Phyllantus niruri L.) Oktafiani, Fitri; Juswono, Unggul P.; Kusharto, dr.
Physics Student Journal Vol 1, No 1 (2013)
Publisher : Department of Physics - Faculty of Science

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

ABSTRAKSistem imun merupakan sistem yang sangat penting untuk mempertahankan homoestatis dan kesehatan tubuh. Gangguan pada sistem ini dapat menyebabkan daya tahan tubuh menurun. Penurunan sistem imun akibat paparan radiasi dapat diketahui dengan melihat populasi sel leukosit dan limfosit pada organ limfoidnya. Populasi sel leukosit dan limfosit diamati menggunakan hemocytometer dan flowcytometer, sedangkan paparan radiasi diberikan menggunakan Pesawat Teleterapi Cobalt-60 dengan variasi 5 dosis yaitu 100, 200, 300, 400, dan 500 Rad. Hasil penelitian menunjukkan paparan radiasi 100 sudah dapat menurunkan populasi kedua sel dengan nilai rata-rata sebesar + 20%. Pada pemberian radiasi hingga 500 rad, populasi kedua sel menurun lebih dari 80% dari kontrolnya. Penambahan antioksidan sangat berguna dalam menangkal radikal bebas yang terbentuk dari interaksi radiasi dengan sel. Salah satu tanaman yang diketahui memiliki kandungan antioksidan yang tinggi yaitu Phyllantus niruri L atau meniran. Meniran memiliki senyawa flavanoid yang dapat menangkap radikal bebas melalui proses free radical scanvenging. Berdasarkan hasil penelitian didapatkan bahwa pemberian ekstrak meniran dapat meningkatkan jumlah populasi sel leukosit dan limfosit pada organ limfoid. Pada penelitian ini juga dilakukan pengamatan terhadap sel nekrosis pada histologi hepar mencit. Ekstrak meniran mampu mempertahankan sel hepatosit hingga 23,72%. dari nekrosis akibat paparan radiasi.Kata kunci: Radiasi Gamma, Limfosit, Leukosit, Hepar, Phyllantus niruri L.
Microwave Rectifier untuk Transmisi Listrik Tanpa Kabel dengan Metode Matching Impedance Wahyu Hendra Gunawan; Fitri Oktafiani; Deryanto Balalembang
JST (Jurnal Sains Terapan) Vol 4, No 2 (2018): JST (Jurnal Sains Terapan)
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat, Politeknik Negeri Balikpapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32487/jst.v4i2.478

Abstract

In this modern era, the high consumption of electrical energy requires considerable resources. Resources used in this modern era include non-renewable energy and environmentally unfriendly, so it takes a new method that is environmentally friendly to meet the needs of electric energy consumption. The energy harvesting technique comes as an environmentally friendly source of energy, harvesting energy techniques utilize the resources around us without causing waste and pollution. Rectifier with matching impedance as a wireless power transmission with signal rectifier capability is an environmentally friendly method of energy harvesting technique. Rectifiers can generate electrical energy sources by utilizing electromagnetic waves as resources captured by antennas. Rectifiers are designed with application simulation process, matching impedance calculation, design printing and measurement with special measuring instrument. Rectifiers are designed and realized in the form of full-wave rectifier types. This rectifier uses a schottky diode HSMS 2860, The measurement of rectifier that uses a signal generator as a measuring device generated output of 5.08 V at 2.4 Ghz level +20 dBm and return loss -37.70 dBm at 2.4 Ghz level +5 dB. Keywords: Microwave, Rectifier and Matching Impedance
Low Pass Filter Design With Artificial Ground Structure Wahyu Hendra Gunawan; Fitri Oktafiani; Bambang Sugeng; Lukman Lukman
JST (Jurnal Sains Terapan) Vol 3, No 2 (2017): JST (Jurnal Sains Terapan)
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat, Politeknik Negeri Balikpapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32487/jst.v3i2.266

Abstract

In this paper, low pass band filter with via holes and using artificial ground structure are proposed. The design contains a u-shaped parasite element and gives via hole which is connected to the ground on the adjacent side with a copper. A hole in this design has a diameter 1 mm. The A have the form square 15mm x 17.5mm, given an effect, if compared with the non-artificial ground structure system, this addition show that the bandwidth of the low pass filter is shifting regarding this condition with value 400Mhz at frequency 1GHz.On this paper, the low pass filter also gives the pass band filter on frequency 3.2GHz which is constructed by the artificial ground structure. The simulation results with this design are simulated by computer based on finite integration method and show a good agreement and can be performed for a low pass band filter applications in the future. Keywords: low pass filter, less via, artificial ground structure 
SISTEM OTOMASI GPS TRACKER PADA KENDARAAN RENTAL MOBIL BERBASIS INTERNET OF THING (IOT) MENGGUNAKAN NODEMCU ESP-32 Hamsir Hamsir; Ain Sahara; Fitri Oktafiani; Dhea Pramestra Ariyani
PETROGAS: Journal of Energy and Technology Vol 5, No 2 (2023): October
Publisher : Sekolah Tinggi Teknologi MIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58267/petrogas.v5i2.153

Abstract

Saat ini bisnis penyewaan mobil adalah bisnis yang menjanjikan banyak manfaat. Jumlah pelanggan layanan sewa mobil setiap tahun meningkat, hal ini terlihat dari jumlah pengusaha rental mobil semakin meningkat dari tahun ke tahun. Tapi dibalik keuntungan bisnis yang cukup menggoda sudah banyak keluhan dalam bisnis penyewaan mobil adalah kejahatan pencurian. Ada banyak alat atau cara yang diambil untuk mengatasi kejahatan pencurian mobil, tetapi tidak banyak yang bisa menjadi solusi yang tepat. Membuat aplikasi pemantauan ini bertujuan untuk menerapkan sistem keamanan berbasis Pelacakan GPS di mana monitor dapat menampilkan status dan lokasi keberadaan mobil yang telah disewa. Metode yang digunakan adalah rekayasa perangkat lunak berorientasi objek termasuk tipe data, metode pengambilan data, analisis sistem, desain sistem, pengembangan sistem, dan pengujian. Hasil akhir dari penelitian ini adalah alat dan sistem aplikasi pemantauan yang mampu menampilkan pembuat ikon sesuai dengan keberadaan mobil dan dapat menampilkan notifikasi atau peringatan. Alat yang digunakan adalah NodeMCU ESP-32 dengan beberapa modul seperti Modul GPS untuk menangkap koordinat dan Modul GSM untuk mengirim data ke server basis data. Untuk melihat menggunakan web dengan peta pemantauan dan sistem peringatan. Sistem peringatan akan secara otomatis memproses data ke dalam database, jika waktu sewa melebihi batas sewa maka peringatan akan memproses data jarak antara mobil sewaan dengan garasi. Jika jarak melebihi 4 km maka sistem akan menampilkan peringatan/pemberitahuan. Kemudian admin juga bisa melacak keberadaan mobil tersebut.
SISTEM OTOMASI PENGHITUNG PENGUNJUNG STADION BASKET MENGGUNAKAN SENSOR PIR BERBASIS ARDUINO UNO Ain Sahara; Hamsir Hamsir; Fitri Oktafiani; Mohammad Fariz Bayazid
PETROGAS: Journal of Energy and Technology Vol 5, No 2 (2023): October
Publisher : Sekolah Tinggi Teknologi MIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58267/petrogas.v5i2.154

Abstract

Pada saat ini kemajuan teknologi elektronik mampu mempermudah pekerjaan pada manusia. Kemajuan teknologi akan membantu manusia dalam mengatasi berbagai masalah – masalah terhadapa ketelitian dan kecepetan serta ketepatan. Alat penghitung orang atau pengunjung ini sendiri penggabungan dari teknologi sensor dan mikrokontroler, dimana semuanya dapat dioperasikan secara otomatis melalui program pada mikrokontroler tersebut. Teknologi saat ini mengalami perkembangan, manusia mulai merancang rancang bangun sistem yang dapat bekerja cepat, teliti dan tidak mengenal lelah. Salah satu alat yang dapat dikonfigurasiakn atauu dikendalikan menggunkan computer ialah mikrokontroller. Adapun mikrokontroller yang digunakan untuk alat ini yaitu arduino uno dan juga modul sensor PIR (Passive Infrared Receiver). Dengan adanya sistem alat tersebut sangat memudahkan dalam menjalankan pekerjaan manusia untuk melakukan pemantauan jumlah sirkulasi manusia pada stadion basket, apabila melebihi dari program sistem tersebut maka buzzer akan berbunyi menandakan bahwa ruangan tersebut sudah terisi penuh.
PEMROGRAMAN SISTEM KEAMANAN WEB ADMINISTRATOR BERDASARKAN IP PUBLIK BERBASIS IOT (INTERNET OF THINGS) Nurjanah, Nurjanah; Hamsir, Hamsir; Zein, Muhammad Ibnu; Oktafiani, Fitri
PETROGAS: Journal of Energy and Technology Vol 6, No 1 (2024): MARCH
Publisher : Sekolah Tinggi Teknologi MIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58267/petrogas.v6i1.167

Abstract

This research offers an innovative solution for implementing an IoT (Internet of Things) based web administrator security system. This research uses a wiring design that has been realized, the system can monitor and control access to the administrator dashboard based on the public IP address of the accessor. Using Lolin (WeMos) D1 R1 as a microcontroller and I2C LCD for data display, users can easily manage web access efficiently. Through the Arduino IDE application using the C/C++ programming language, this system can be set up with setup and loop functions, ensuring proper initialization and repeated processing of access requests. The test results of this system successfully demonstrated its ability to detect unauthorized access and block it with a fast response. An unknown IP will be detected on the system and turn on the alarm/buzzer and the public IP will appear on the LCD. Easy access control via tactical buttons works to block unauthorized access. This system also sends notifications via the Telegram application, providing greater convenience and control for users. In its development, this system can be applied and combined with various devices as a control and security system.
MENGGESER TITIK FOKUS LENSA PLASMONIK SPIRAL DENGAN MENGUBAH PANJANG GELOMBANG CAHAYA DATANG Oktafiani, Fitri
PETROGAS: Journal of Energy and Technology Vol 6, No 1 (2024): MARCH
Publisher : Sekolah Tinggi Teknologi MIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58267/petrogas.v6i1.150

Abstract

Plasmonic structures are metal-based structures characterized by plasmon oscillations in the electron conduction band in response to external radiation. This structure has strong light absorption and light scattering as well as electromagnetic field amplification at short distances (near-field). Based on these advantages, improving the focusing performance of surface plasmonic polariton waves is urgently needed. The sharp focus with strong intensity has been used for various applications, including nanoimaging, nanolithography, and optical tweezers. In this research, we use a spiral plasmonic lens combined with a groove ring and the incident beam has a circular polarization direction (circular polarization). The spiral plasmonic lens functions to generate plasmonic waves, while the groove ring functions to spread plasmonic waves on the surface to the focal point with a certain curve in the z-axis direction (far-field). Parameter optimization is carried out by varying the position of the ring groove. Two waves are used to shift the focus point, namely 1064 nm and 1280 nm. The focal point experiences a range of +500 nm on the z-axis when the waveform is changed. However, the intensity of the focal point at the 1280 nm wave is lower than at the 1064 nm wave. This is in accordance with the theory that when the focal point is further away from the surface structure, the intensity decreases. Shifting the focal point by changing waves can be used in several applications, one example is for manipulating microparticles in two different places.
PENENTUAN REMAINING LIFETIME NET GAS WASH COLUMN BERBASIS LAJU KOROSI INTERNAL DI HYDROCRACKING TREATMENT UNIT PLANT 5 Risna, Risna; Siwi, Riedel Tryxie; Manik, Nijusiho; Oktafiani, Fitri
PETROGAS: Journal of Energy and Technology Vol 6, No 1 (2024): MARCH
Publisher : Sekolah Tinggi Teknologi MIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58267/petrogas.v6i1.166

Abstract

Corrosion on the internal equipment of the Net Gas Wash Column is the thinning of the material which, if prevention or control is not carried out, will cause damage or leaks to the equipment. Internal corrosion of equipment such as Net gas wash columns is a common problem in industries that use chemical processes or gas processing. Corrosion occurs when metal materials react with the surrounding environment, such as gases involved in the process, moisture, or other chemicals. Several factors that can cause internal corrosion of equipment such as the Net Gas Wash Column include environmental conditions, material properties, temperature and pressure and the presence of water or humidity. This research aims to determine the corrosion conditions that occur, the impact of corrosion rate, thickness thinning, and the relationship between corrosion rate and remaining lifetime. This research uses a non-destructive testing method, namely the Ultrasonic Test. The results of the analysis and calculations were obtained for the corrosion rate that occurred on the Net Gas Wash Column tool, namely shell 0.11 mm/year and head 0.3 mm/year which was caused by temperature and working flow rate. The direct impact of corrosion is equipment damage and the indirect impact is the costs incurred to replace the equipment. The remaining lifetime for the shell and head is 69 years and 40 years. When the remaining lifetime decreases, the depletion caused by the H2S compound and the corrosion rate will increase immediately. From the results of this research, the relationship between the causes, impacts and corrosion rates on the remaining lifetime of the Net Gas Wash Column equipment can be identified and analyzed.
Design of Micro Wind Power Plant using Dual Savonius Turbines Saputra, Riza Hadi; Risna, Risna; Oktafiani, Fitri; Sampurno, Yusuf Cahyo; Ardito, Jheskia
Journal of Computer, Electronic, and Telecommunication (COMPLETE) Vol. 5 No. 2 (2024): December
Publisher : Telkom University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52435/complete.v5i2.623

Abstract

Wind power plants are one of the renewable energy solutions that are environmentally friendly and sustainable. The success of such plants heavily depends on the location, which plays a crucial role in determining the availability of wind. In addition to highlands, coastal areas can serve as suitable locations. Balikpapan, with its expansive coastlines, holds significant potential for harnessing wind energy as a source of electricity. However, the utilization of this wind energy, particularly on a micro-scale, remains suboptimal. Research conducted over three days recorded wind speeds between 4 m/s and 5 m/s, generating voltages between 3 volts and 4 volts, which is only 1/3 of the total potential voltage. There is still an untapped potential of about 2/3 or 6 volts that could be harnessed if wind speeds reach 12 m/s to 15 m/s. The study concludes that the wind speed at Airport Beach is not yet sufficient to produce the maximum possible voltage. The current wind speeds are only capable of powering a 5-volt capacity light, with the generated energy stored in a battery for later use.
Analisis Penentuan Nilai Cation Exchange Capacity (CEC) Berdasarkan Hasil Methylene Blue Test (MBT) di Trayek 12¼ Manik, Nijusiho; Paindan, Esterina Natalia; Pratama, Gusti Arya; Sahara, Ain; Oktafiani, Fitri
Majamecha Vol. 6 No. 1 (2024): Majamecha
Publisher : Program Studi Teknik Mesin, Fakultas Teknik, Universitas Islam Majapahit, Mojokerto, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36815/majamecha.v6i1.3287

Abstract

Lumpur merupakan salah satu faktor sangat penting dalam menunjang suksesnya operasi pemboran pada sumur minyak. Perencanaan penggunaan lumpur pemboran bertujuan memperoleh hasil yang lebih maksimal dalam pengangkatan cutting dan perawatan sumur pemboran. Penelitian ini bertujuan untuk mengetahui kereaktifan cutting dengan mengidentifikasi kadar clay dan mengetahui komposisi lumpur yang sesuai dengan trayek 12¼. Metode pengujian ini dilakukan dilaboratorium STT Migas dengan beberapa pengujian yaitu yield point (YP), plastic viscosity (PV), gel strength Methylene Blue Test (MBT), dan Cation Exchange Capacity (CEC). Hasil pengujian PV pada original mud didapatkan sebesar 17 cps, dan saat dilakukan pengujian dengan contamination clay didapatkan hasil sebesar 20 cps. Pada YP diperoleh hasil original mud yaitu sebesar 32 lbs/100ft dan dari pengujian yang menggunakan contamination diperoleh hasil sebesar 35 lbs/100ft2. Dari penggunaan gel strength selama 10 detik diperoleh hasil original mud sebesar 9 lbs/100ft2, dan saat dilakukan pengujian dengan contamination clay diperoleh hasil yang sama yaitu 9 lbs/100ft2. Untuk penggunaan gel strength selama 10 menit dari hasil original mud diperoleh 13 lbs/100ft2, dan setelah pengujian dengan contamination clay didapatkan 14 lbs/100ft2. Pada hasil rheology sampel cutting yang diuji menunjukkan bahwa Xanthun Gum mempengaruhi kekentalan sistem lumpur KCL-Polimer. Dari hasil MBT 3 meq dan CEC 15 meq/100gr dapat dipastikan tidak terjadi swelling karena sampel cutting tersebut tergolong tidak reaktif.
Co-Authors Ahmad Rosidi, Ahmad Ain Sahara Ananda, Reski Nur Andi Maulana, Andi Ardito, Jheskia Aribowo, George Nathaniel Putra Arif, Rizky Gunawan Ariyani, Debora Bambang Sugeng Derbika, Rangga Deryanto Balalembang Dhea Pramestra Ariyani dr. Kusharto ertapati, Muhammad Fakih Ramdhani K Hamsir Hamsir Hamsir Hamsir Iin Darmiyati Imran, Ahmad Lukman Lukman LUKMAN, LUKMAN Manda, Cristy Rahayu Manik, Nijusiho Maulana, Ranjiv Megawati, Eka Mohammad Fariz Bayazid Muhammad Iqbal N. Nurjanah Nurjanah Nurjannah Nurjannah Paindan, Esterina Natalia Pongarrang, Frederika Pratama, Frenly Adhe Pratama, Gusti Arya Purnomo, Ferdi Bagus Rachmasari Pramita Wardhani Randanan, Eltimeyansi Crisye Rezha, Muhammad Risna Risna, Risna Rohima Sera Afifah Sampurno, Yusuf Cahyo Saputra, M Abdy Saputra, Riza Hadi Sarungu, Selvia Septiawan, Bima Siwi, Riedel Tryxie Surya Saputra, Surya Syuhada, Nurul Ain Unggul P. Juswono Vegatama, Meita Rezki Wahyu Hendra Gunawan Wahyu Hendra Gunawan Wijaya, Sigit Kusuma Willard, Karnila Yanti, Dawi Yuniarti Yuniarti Zein, Muhammad Ibnu