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All Journal RADIASI: Jurnal Berkala Pendidikan Fisika POSITRON IPTEK The Journal for Technology and Science Jurnal Pendidikan Fisika Indonesia Abdimas Jurnal Kimia dan Kemasan JFA (Jurnal Fisika dan Aplikasinya) Jurnal Fisika FLUX Scientiae Educatia: Jurnal Pendidikan Sains JPPPF (Jurnal Penelitian dan Pengembangan Pendidikan Fisika) JRST (Jurnal Riset Sains dan Teknologi) Ketenagalistrikan dan Energi Terbarukan Edu Sciences Journal Jurnal Sains dan Edukasi Sains Journal of Science and Science Education Magistrorum et Scholarium: Jurnal Pengabdian Masyarakat Scientiae Educatia: Jurnal Pendidikan Sains
Nur Aji Wibowo
Universitas Kristen Satya Wacana
Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Perbandingan Pengaruh Redaman Gilbert dan Ketebalan Bahan Terhadap Perubahan Dinamika Magnetisasi pada Nanodot Pt/MnSb dan CoFeAl: Ivana Helga Iriani, Andreas Setiawan, Nur Aji Wibowo Ivana Helga Iriani Ivana Helga Iriani; Andreas Setiawan Andreas Setiawan; Nur Aji Wibowo Nur Aji Wibowo
Jurnal Fisika dan Aplikasinya Vol 16 No 3 (2020): October 2020 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i3.5460

Abstract

Penelitian ini menyajikan perbandingan pengaruh redaman Gilbert dan ketebalan nanodot terhadap dinamika magnetisasi dari Pt/MnSb dan CoFeAl dengan menyelesaikan persamaan Landau-Lifshift Gilbert menggunakan Simulator Mikromagnetik. Parameter magnetik yang digunakan dalam penelitian ini mewakili karakteristik Pt/MnSb dan CoFeAl dengan variasi redaman Gilbert 0,4 – 0,9. Kedua bahan dimodelkan dalam bentuk balok dengan ukuran permukaan 50×50 nm2 dan dengan variasi ketebalan 5 – 100 nm. Skema simulasi yang digunakan adalah Reduced Barrier Writing dimana sampel berada pada suhu ruang 298 K sembari diinduksi dengan medan magnetik eksternal yang besarnya meningkat dari 0 hingga 2 Tesla selama 2,5 ns. Hasil penelitian menunjukkan bahwa Pt/MnSb dan CoFeAl memiliki kestabilan termal yang baik untuk berbagai nilai redaman Gilbert dan variasi ketebalan yang dipakai (>60 kBT). Peningkatan redaman Gilbert memperbesar nilai medan nukleasi kedua bahan. Medan nukleasi meningkat pada ketebalan 5 – 35 nm namun menurun pada ketebalan 40 – 100 nm. Penguatan redaman Gilbert menyebabkan perbesaran nilai medan koersif bahan CoFeAl dan penurunan untuk bahan Pt/MnSb. Sementara itu, mempertebal bahan menyebabkan peningkatan medan koersif pada ketebalan 5 – 35 nm dan penurunan pada ketebalan 40 – 100 nm. Laju magnetisasi kedua jenis bahan semakin cepat seiring menguatnya nilai redaman Gilbert dan melambat seiring meningkatnya ketebalan.
Determinasi Kandungan pada Campuran Lemak Babi dengan Sapi menggunakan Spektroskopi Inframerah Dekat dan Partial Least Square Regression: Rizki E. Agustin, Nur A. Wibowo, dan Ferdy S. Rondonuwu Rizki E. Agustin Rizki E. Agustin; Nur A. Wibowo Nur A. Wibowo; Ferdy S. Rondonuwu Ferdy S. Rondonuwu
Jurnal Fisika dan Aplikasinya Vol 15 No 3 (2019): October 2019 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v15i3.4546

Abstract

Fat is one of important elements for human’s body. Therefore, fat is often added as one of main ingredients both in food industry activity and in cosmetic products. In this study, another technique was done to make an assumption about the content of fat by using Near Infrared Spectroscopy, NIRS and it was followed by Partial Least Square Regression, PLSR. This assumption was done by making 21 samples with the pork fat percentage toward the cow fat (w/w), which was 0,00, 0,05 until 1,00 with the interval of 0,05. This calibration model was developed using 11 samples of even concentrate and it was validated by using 10 samples of odd concentrate. The infra-red spectrum used in this study was around 4.000-10.000 cm-1. Prior data treatment covered smoothing, normalizing, the first, and the second derivative which were used to optimized the developed PLSR-NIRS prediction models. The second descending spectrum was used to increase the spectrum resolution before PLS analysis was done. Overall, the NIRS and PLSR techniques were sucessful in showing the percentage of the content in the mixted samples of pork and cow fat.
Efektivitas Paparan Medan Magnet Lemah Terhadap Tingkat Kesempurnaan Pembakaran Bahan Bakar Minyak Beroktan Rendah: Shinta Monika Utami, Giner Maslebu, dan Nur Aji Wibowo Shinta Monika Utami Shinta Monika Utami; Giner Maslebu Giner Maslebu; Nur Aji Wibowo Nur Aji Wibowo
Jurnal Fisika dan Aplikasinya Vol 15 No 2 (2019): June 2019 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v15i2.3578

Abstract

Increasing levels of octane fuel in order to efficient its increasingly scarce use has been done. However, consumers still maintain the use of low-octane fuel because of its affordable price. The treatment in the form of magnetic field exposure on fuel is a means that is believed able to improve the completeness of combustion. In this study, tests were conducted on low-octane fuel with exposure to weak magnetic fields aimed at streamlining the scarcity of low-octane fuel usage. Exposure to weak magnetic fields in the storage tank before going into the combustion process will stretch the hydrocarbon bonds so that the hydrocarbon molecules are easier to oxidise. Fuel exposed to a weak magnetic field is applied to a two-stroke engine with varying engine workloads. The level of combustion completeness is measured from reduction of fuel consumption and the percentage of O2 emissions. The results of this study indicate that exposure to weak magnetic fields on low-octane fuel significantly improves the completeness of combustion processes.
Co-Authors A. Oktaviara Adita Sutresno Aji, P. P. Albertus Sigit Pradipta Andreas Setiawan Andreas Setiawan Andreas Setiawan Anisa Setiyani Astuti, N. H. Ayub, M. R. S. S. N. Beta Sugesti Situmeang Budi Purnama Cari Cari Cucun Alep Riyanto Debora Natalia Sudjito Dewi Intan Purwitasari Dhel Prisca Daro Kowe Edi Suharyadi Eklesias Donesi Andresta Eklesias Donesi Andresta Eklesias Donesi Andresta Elfira Josmin Fillimditty Ferdy Semuel Rondonuwu Fransisca Indra Dewi Giner Maslebu Guritna, Edi Hafidz Bahtiar Hanny Hafiar Hidayatullah, Muhammad Istiqomah, Nurul Imani Ivana Helga Iriani Ivana Helga Iriani Ivana Helga Iriani Jodelin Muninggar, Jodelin Lilik Linawati Lilik Linawati Litta Marlin Patty M. R. S. Shanti Made R. S. S. N. Ayub Mahardika Yoga Darmawan Mamea, Cinndy Angel Mayasari, Anisa Nurul Imani Istiqomah Purwoko, Agus Putri, Dera Anastasya Rahardian, Renaldy Baptista Rendi Hadi Perdana Rizki E. Agustin Rizki E. Agustin Sari, Emi Kurnia Shinta Monika Utami Shinta Monika Utami Shinta Monika Utami Siswantika, Priskila Harli Wachid Susilo