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All Journal Jurnal Teknologi Reaktor Nuklir Tri Dasa Mega Omega: Jurnal Fisika dan Pendidikan Fisika Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Fisika Indonesia
Fahrudin Nugroho
Departemen Fisika Fakultas Matematika Dan Ilmu Pengetahuan, Universitas Gadjah Mada, Yogyakarta, 55281
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Energy Materials Science & Nanotechnology Physics

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Introducing Undergraduate Students to Nonlinear Dynamics through A Numerical Approach Nugroho, Fahrudin; Azhari, Irfan Taufiq; Yusuf, Yusril; Nurwantoro, Pekik
Omega: Jurnal Fisika dan Pendidikan Fisika Vol 4 No 2 (2018)
Publisher : Program Studi Pendidikan Fisika UHAMKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31758/OmegaJPhysPhysEduc.v4i2.45

Abstract

This paper describes a numerical method that used to solve the nonlinear Schr\"{o}dinger equation. The methods are an exponential time differencing method and a spectral method. The result indicates that at a certain parameter, fluctuation of wave function has contained chaotic dynamics. This case is expected to be used as an example for introducing numerical methods to undergraduate students on nonlinear dynamics. This introduction is deemed necessary, referring to the curriculum and syllabus used in several educational institutions in various countries that have included the topic of nonlinearity.
OPTIMIZATION OF BIOLOGICAL SHIELD FOR BORON NEUTRON CAPTURE CANCER THERAPY (BNCT) AT KARTINI RESEARCH REACTOR Gani Priambodo; Fahrudin Nugroho; Dwi Satya Palupi; Rosilatul Zailani; Yohannes Sardjono
JURNAL TEKNOLOGI REAKTOR NUKLIR TRI DASA MEGA Vol 19, No 3 (2017): Oktober 2017
Publisher : Pusat Teknologi Dan Keselamatan Reaktor Nuklir (PTKRN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (821.431 KB) | DOI: 10.17146/tdm.2017.19.3.3626

Abstract

A study to optimize a model of neutron radiation shielding for BNCT facility in the irradiation room has been performed. The collimator used in this study is a predesigned collimator from earlier studies. The model includes the selection of the materials and the thickness of materials used for radiation shield. The radiation shield is required to absorb leaking radiation in order to protect workers at the threshold dose of 20 mSv/year. The considered materials were barite concrete, paraffin, stainless steel 304 and lead. The leaking neutron radiation dose rates have been determined using Monte Carlo N Particle Version Extended (MCNPX) with a radiation dose limit rate that is less than 10 µSv/hour. This dose limit is in accordance with BAPETEN regulation related the threshold dose for workers, in which the working duration is 8 hours per day and 5 days per week. It is recommended that the best model for the irradiation room has a dimension 30 cm width, 30 cm length, 30 cm height and a main layer of irradiation room shielding made from the material paraffin which is 68 cm thickness on the left side and bottom of the irradiation room, 70 cm thickness on the right side of the iradiation room, 45 cm thickness on the front of the irradiation room and 67 cm thickness on the top of the irradiation room. The additional layers of 15 cm and 10 cm thickness are used along with paraffin in order to reduce the intensity of primary radiation from piercing the beamport after two primary layers. There is no neutron radiation leakage in this model.Keywords: Radiation shielding, BNCT, MCNPX, radiation dose rate, piercing beamport. OPTIMASI PERISAI RADIASI NEUTRON FASILITAS RUANGAN IRADIASI UNTUK BORON NEUTRON CAPTURE CANCER THERAPY (BNCT) DENGAN SUMBER BEAMPORT TEMBUS REAKTOR KARTINI. Telah dilakukan pemodelan perisai radiasi neutron untuk fasilitas Boron Neutron Capture Therapy (BNCT) pada sekeliling ruangan iradiasi. Pemodelan mencakup pemilihan bahan dan tebal yang digunakan untuk perisai radiasi. Perisai diharuskan mampu menahan radiasi yang keluar ruangan sehingga dosis radiasi berada di bawah ambang dosis bagi pekerja radiasi sebesar 20 mSv/tahun. Bahan yang dipertimbangkan adalah beton barit, paraffin, stainless steel 304 dan timbal. Perhitungan laju dosis neutron epitermal dilakukan dengan menggunakan program Monte Carlo N Particle Version Extended (MCNPX) dengan batasan laju dosis radiasi kurang dari 10 µSv/jam, sesuai dengan peraturan Kepala BAPETEN mengenai batas ambang laju dosis pekerja radiasi, dengan asumsi perhitungan waktu kerja 8 jam per hari dan 5 hari per minggu. Desain pertama dari empat desain yang telah dibuat kemudian dipilih sebagai desain yang direkomendasikan dengan laju dosis di bawah batas ambang 10 µSv/jam. Ruangan iradiasi memiliki dimensi panjang 30 cm, lebar 30 cm dan tinggi 30 cm. Lapisan utama perisai pada desain pertama berbahan paraffin setebal 68 cm pada sisi kiri dan bawah ruangan, 70 cm pada sisi kanan ruangan, 45 cm pada sisi depan ruangan dan 67 cm pada sisi atas ruangan. Paraffin setebal 15 cm dan 10 cm ditambahkan sebagai peredam intensitas radiasi primer dari beamport tembus yang masih cukup besar.Kata Kunci: perisai radiasi, BNCT, MCNPX, laju dosis radiasi, beamport tembus.
Identifikasi Partikel Emas Pada Daun Kayu Putih dengan XRF (X-Ray Fluorescence) dan AAS (Atomic Absorption Spectroscopy) Sebagai Indikator Potensial Tambang Emas di Indonesia Dian Artha Kusumaningtyas; Hanif Khoirudin; Muamila Tami; Mila Utami Sari; Arif Nirsatmanto; Ari Dwi Nugraheni; Fahrudin Nugroho
Jurnal Penelitian Pendidikan IPA Vol 8 No 1 (2022): January
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v8i1.1092

Abstract

Eucalyptus is a plant that is able to absorb gold (Au) particles from the soil and store them in the leaves. Eucalyptus roots have the ability to penetrate the soil of the calcrete zone, which is rich in the mineral calcium (Ca). Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. and contains Au particles as impurities, making this plant a potential natural indicator (biogeochemical) of potential Au metal mining. The Au content in eucalyptus leaves can be determined by using the XRF (X-Ray Fluorescence) instrumentation material analysis method for qualitative analysis and AAS (Atomic Absorption Spectroscopy) for quantitative results. The form of XRF characterization of the intensity versus energy spectrum of certain elements from the XRF analysis results obtained is a spectrum with a peak power of 9.731 keV which indicates the presence of Au metal in the sample. The results obtained qualitatively are the Au metal content in the eucalyptus leaf sample of (9.0 ± 0.5) ppm. However, the Au metal content in each leaf sample was different. This provides information that Eucalyptus from different plants has the potential to be a biogeochemical indicator of potential Au metal mining in Indonesia
Transisi Keadaan Defect-Non Defect pada Konveksi Listrik Kristal Cair Nematic Homeotropic dibawah Pengaruh Medan Magnet (Halaman 12 s.d. 15) Fahrudin Nugroho; Yoshiki Hidaka; Tatsuhiro Ueki; Shoichi Kai
Jurnal Fisika Indonesia Vol 17, No 50 (2013)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1409.049 KB) | DOI: 10.22146/jfi.24416

Abstract

Dalam penelitian kali ini akan dikaji fenomena konveksi listrik kristal cair nemaik homeotropik dibawah pengaruh medan magnet luar. Dalam percobaan dapat diamati fenomena munculnya defect pada soft mode turbulence yaitu spatiotemporal chaos akibat interaksi moda  konveksi listrik dengan moda Nambu-Goldstone. Dapat diamati bahwa terjadi transisi keadaan defect ke keadaan non defect yang terjadi pada medan magnet kritis tertentu Hc = 450 G. Lebih lanjut dengan pengamatan cross polarizer telah berhasil dijelaskan femonena terjadinya transisi dari keadaan defect ke non defect tersebut. Hal itu diakibatkan oleh tertekannya kebebasan berotasi dari kristal cair nematik.
Material Magnetoelastik sebagai Alternatif Pengganti Otot Buatan Arjun Prayoga Aji; Yeti Rafitasari; Harry Miyosi Silalahi; Tanty Dwi Purwita; Febrilian Dwi Laksono; Fahrudin Nugroho
Jurnal Fisika Indonesia Vol 21, No 1 (2017)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (836.451 KB) | DOI: 10.22146/jfi.38612

Abstract

Aktuator elastik merupakan solusi rancang gerak kontinu pada bidang robotika. Penggunaan material magnetoelastik diusulkan sebagai alternatif aktuator elastik tersebut. Pada penelitian ini respon magnetik material magnetoelastik dikarakterisasi menggunakann set alat electromagnet pada suhu kamar (T = 27 oC). Komposisi penyusun sampel magnetoelastik yang digunakan terdiri dari bahan basis silikon (RTV Gasket, RTV 585, RTV 52) dan bahan magnet ferimagnetik magnetite (Fe3O4). Respon sampel teramati akibat pengaruh medan magnet luar (B). Melalui analisa grafik respon magnetik sampel dapat didekati dengan model persamaan kuadratik. Hasilnya adalah terdapat kompetisi antara sifat magnetik pengotor magnetite (Fe3O4) dengan total volume material magnetoelastik. Kompetisi kedua parameter tersebut bersifat tidak linier. Kompetisi ini bertanggung jawab atas hasil optimasi jenis dan optimasi konsentrasi. Jenis optimal bahan basis material magnetoelastik pada penelitian ini adalah RTV Gasket dan RTV 52, sedangkan konsentrasi optimal  komposisi basis berbanding pengotornya adalah (50 : 50) %. Dalam penelitian ini juga diamati adanya sifat histerisis material magnetoelastik.
Co-Authors Ari Dwi Nugraheni Arif Nirsatmanto Arjun Prayoga Aji Azhari, Irfan Taufiq Dian Artha Kusumaningtyas Dwi Satya Palupi Fachrizal Rian Pratama, Fachrizal Febrilian Dwi Laksono Gani Priambodo Hamadi, Halim Hanif Khoirudin Harry Miyosi Silalahi Mila Utami Sari Muamila Tami Pekik Nurwantoro Rosilatul Zailani Shoichi Kai Tanty Dwi Purwita Tatsuhiro Ueki Wulaningrum, Sarah Rizky Yeti Rafitasari Yohannes Sardjono Yoshiki Hidaka Yusril Yusuf