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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) Journal of Physics: Theories and Applications Ketenagalistrikan dan Energi Terbarukan Edu Sciences Journal Jurnal Sains dan Edukasi Sains Journal of Science and Science Education Magistrorum et Scholarium: Jurnal Pengabdian Masyarakat
Nur Aji Wibowo
Universitas Kristen Satya Wacana
Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Konstruksi Sel Surya Bio menggunakan Campuran Klorofil-Karotenoid sebagai Sensitizer Hafidz Bahtiar; Nur Aji Wibowo; Ferdy Semuel Rondonuwu
Jurnal Fisika dan Aplikasinya Vol 11, No 1 (2015)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (416.731 KB) | DOI: 10.12962/j24604682.v11i1.780

Abstract

Klorofil dan karotenoid merupakan pikmen yang digunakan oleh organisme fotosintetik sebagai pemanan cahaya. Klorofil dan karotenoid tersedia secara melimpah pada akar, batang, daun dan buah, maupun bakteri fotosintetik. Sebagai pemanen cahaya yang efisien, klorofil dan karotenoid dimanfaatkan sebagai sensitizer pada selsurya tersintesa pewarna menggunakan konstruksi Gr¨atzel (Dye sensitized solar cell, DSSC). Kombinasi karotenoid dan klorofil sebagai sensitizer pada DSSC memungkinkan peningkatan efisiensi dibandingkandengan sensitizer masing-masing pikmen tersebut. Penelitian ini melaporkan hasil konstruksi DSSC dengan menggunakan campuran -karoten dan klorofil sebagai sensitizer. Campuran klorofil dan -karoten mempunyai keluaran Voc sebesar 14,1 mV dan Jsc sebesar 5,76 μA/cm2 dengan efisiensi mencapai 4,42 × 10−5%.
Efektivitas Paparan Medan Magnet Lemah Terhadap Tingkat Kesempurnaan Pembakaran Bahan Bakar Minyak Beroktan Rendah Shinta Monika Utami; Giner Maslebu; Nur Aji Wibowo
Jurnal Fisika dan Aplikasinya Vol 15, No 2 (2019)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (583.522 KB) | DOI: 10.12962/j24604682.v15i2.4269

Abstract

Peningkatan kadar oktan bahan bakar minyak (BBM) guna mengefisienkan pengunaannya yang semakin langka telah dilakukan. Namun, para konsumen tetap saja mempertahankan penggunaan BBM beroktan rendah karena harganya yang terjangkau. Perlakuan berupa paparan medan magnet pada BBM merupakan cara yang diyakini dapat meningkatkan kesempurnaan pembakaran. Pengujian dilakukan pada BBM beroktan rendah dengan paparan medan magnet lemah bertujuan untuk mengefisiensikan kelangkaan penggunaan BBM beroktan rendah. Paparan medan magnet lemah pada tangki penyimpanan sebelum masuk ke proses pembakaran akan merenggangkan ikatan hidrokarbon sehingga molekul hidrokarbon lebih mudah untuk teroksidasi. BBM yang terpapar medan magnet lemah diaplikasikan pada mesin motor 2-tak dengan variasi beban kerja mesin. Tingkat kesempurnaan proses pembakaran diukur dari penurunan konsumsi bahan bakar dan persentase emisi O2. Hasil dari penelitian ini menunjukkan bahwa pemaparan medan magnet lemah pada BBM beroktan rendah mampu secara signifikan meningkatkan kesempurnaan proses pembakaran.
Desain Eksperimen Karakterisasi Perilaku Udara Sekitar dalam Tinjauan Sebagai Gas Ideal atau Gas Nyata Nur Aji Wibowo; Wachid Susilo; Albertus Sigit Pradipta; Anisa Setiyani; Elfira Josmin Fillimditty
Scientiae Educatia: Jurnal Pendidikan Sains Vol 6, No 2 (2017): December (2017)
Publisher : Tadris Biologi Fakultas Ilmu Tarbiyah dan Keguruan IAIN SYEKH NURJATI CIREBON

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (620.725 KB) | DOI: 10.24235/sc.educatia.v6i2.1823

Abstract

The aim of this study is to characterize the behavior of the environmental air using a simple method which can be implemented as a learning media in senior high school or undergraduate students. The method used is experimental which combined with curve fitting. From the curve fitting step, the behavior of the air can be explained. Otherwise, the quantitative data such as Van der Waals constants can also be obtained. From this study obtained that the Van der Waals constants, a and b, of the chosen air samples as large as (11.23 ± 0.84) J.m3/mol2 and (2.04 ± 0.15) × 10-3 m3/mol respectively. These results can be used to predict that the chosen air samples will act as an ideal gas at 636.5 K and 105 Pa in temperature and pressure respectively.Tujuan dari penelitian ini untuk mengetahui perilaku udara sekitar dalam tinjauan sebagai gas ideal atau gas nyata dengan metode sederhana yang dapat diterapkan sebagai media pembelajaran baik di tingkat perguruan tinggi maupun sekolah menengah atas. Metode yang digunakan adalah eksperimen yang dipadukan dengan pencocokan kurva. Informasi terkait kecenderungan perilaku udara sekitar diperoleh dari tahapan pencocokan kurva. Nilai kuantitatif yang berupa konstanta Van der Waals dari sampel udara sekitar juga dapat diperoleh dari persamaan hasil pencocokan kurva yaitu a dan b secara berturut-turut sebesar (11.23 ± 0.84) J.m3/mol2 dan (2.04 ± 0.15) × 10-3 m3/mol. Nilai konstanta yang diperoleh dapat digunakan untuk memprediksi bahwa sampel udara yang diamati akan berperilaku sebagai gas ideal ketika bersuhu 636.5 K dengan tekanan 105 Pa.
Heat Assisted Magnetization Reversal on Perpendicular Magnetized Nano-Dot Nur Aji Wibowo; Cari Cari; Budi Purnama
IPTEK The Journal for Technology and Science Vol 22, No 2 (2011)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v22i2.64

Abstract

Heat assisted magnetization reversal on perpendicular magnetized nano-dots has been studied by solved Landau Lifshift-Gilbert equation for magnetic recording application. The heat assisted magnetization reversal scheme has been proven to be effectively reduces threshold field down to 90 %. Otherwise, this field doesn’t depend on heating time. To understand a read-write information process, cooling time dependence of threshold field has been evaluated. As a result, the threshold field depends on the cooling time and become constant after 300 ps. This result corresponds to data transfer of Hard Disc Drive about 30 Gb/s.
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
Jurnal Fisika dan Aplikasinya Vol 16, No 3 (2020)
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.
Investigasi Pengaruh Jarak Celah Sinapsis dengan menggunakan Metode Monte Carlo Eklesias Donesi Andresta; Nur Aji Wibowo; Adita Sutresno
Jurnal Fisika dan Aplikasinya Vol 16, No 3 (2020)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i3.5095

Abstract

Neurons in the human brain are interconnected and influence each other. Signal integration in brain is determined by the size and the fast synapses response kinetics. This research aims to study the effect of synaptic cleft distance on signaling through a diffusion process using the Monte Carlo Cell simulation program. This research is important to investigate the diffusion process in the body related to the effect of diffusion on signaling if the cleft, area, and concentration are varied. MCell is a probabilistic simulation which a solution of a problem is given based on the probability calculation process. This study uses modeling 3 spherical compartments representing pre-synapses, post-synapses, and neurons as the outer boundary of synapses and as a cleft between pre-synapses and post-synapses. The simulation results showed that the effect of change in the cleft distance on molecular distribution was 98,86%. The narrower size of the cleft distance causes faster molecular distribution. The broader the receptor area (6;12;18;24) causes the molecules to be distributed to increase ((1661;2173;2249;2264)moles). An increase in the amount of concentration (2000;4000;6000;8000) also makes the diffusion rate faster ((1380;2806.25;4203.75;5565)moles/s). The faster the diffusion rate indicates that the signaling process is getting faster.
Design of measuring flow velocity device for liquid fluid with venturi meter principles based on Arduino Rendi Hadi Perdana; Nur Aji Wibowo; Made R. S. S. N. Ayub
Journal of Science and Science Education Vol 2 No 1 (2018): JoSSE Vol. 2 No. 1 (May 2018)
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/josse.v2i1p13-20

Abstract

Fluid flow velocity in physics can be found on the principle of venturi meter. The Fluid flow concept is easy to understand if visualized. We need a learning media of fluid velocity, so the concept can understanding. Design of this tool aims to help students understand the fluid flow velocity. Data is taken automatically by Arduino-based water flow sensor, with speed change at the speed knop. Based on the design result of the tool which can be obtained by measuring the fluid flow velocity at a speed greater than 0.36 m/s, and proved by graph analysis logarithmic between velocity values of magnitude theory (Vtheory = 0.5x + 0.7934 m/s ) and tool speed (Vtool = 0.5825x + 1.129 m/s). The speed difference between the theory and the tool indicates the magnitude of the frictional speed due to the turbulent flow. So it can be concluded the design of this tool can be used as a learning media to help students in understanding the topic of fluid.
PROFILE OF LUNGS VOLUME IN THE DIABETES MELITUS AND NON DIABETES MELITUS Litta Marlin Patty; Jodelin Muninggar; Nur Aji Wibowo
EDU SCIENCES JOURNAL Vol 1 No 1 (2020): Edu Sciences Journal
Publisher : Faculty of Teacher Training and Educational Sciences, Pattimura University Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (718.623 KB) | DOI: 10.30598/edusciencesvol1iss1pp25-36

Abstract

International Diabetes Federation states that in 2007 there were 246 million people in the world suffering from diabetes and it is expected to increase to 380 million by 2025. DM can cause susceptibility to infections in the human lung organs due to hyperglycemia. The purpose of this study was to determine the lung volume profile in the form of VT, VCI, VCE and VKP in the DM group and non DM group. This study uses a quantitative descriptive survey design with a sample of 60 people, consisting of 30 people from the DM group and 30 people from the Non DM group. The statistical test used in this study is the Independent statistical sample t-test, the Mann-Whitney test and the Pearson correlation. The results showed: (1) There was a significant difference in the DM of the DM group and the Non DM group with p = 0.021 (p <0.05); (2) There were significant differences in VT, VCI, VCE of the DM group and Non DM group with significant values ​​of VT (p = 0,000 <0.05), VCI (p = 0.003 <0.05) and VCE (p = 0.001 <0.05); (3) There was no significant difference in the VKP of the DM group and the Non DM group with p = 0.805 (p <0.05); (4) Relationship between GD and VT (r = 0.220), GD with VCI (r = 0.308), GD with VCE (r = -0.110), GD with VKP (r = 0.219). So it was concluded that there was a positive relationship between GD and VT, VCI, VKP and also there was a negative relationship between GD and VCE. Suggestion: DM sufferers need to conduct routine checks so that health remains well controlled
A micromagnetic study: lateral size dependence of the macroscopic properties of rectangular parallelepiped Cobalt-ferrite nanoferromagnetic Nur Aji Wibowo; Susatyo Pranoto; Cucun Alep Riyanto; Andreas Setiawan
Journal of Physics: Theories and Applications Vol 4, No 1 (2020): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jphystheor-appl.v4i1.46692

Abstract

The purpose of this study is to provide systematic information through micromagnetic simulations related to the impact of particle size on the magnetic characteristics of Cobalt-ferrite MNP. The micromagnetic computations performed were based on LLG equation. The MNPs sample was simulated in the form of a rectangular parallelepiped with a thickness of 20 nm and square surface with lateral length varies from 10 to 80 nm at an interval of 10 nm. The results of this study indicate that the size changes in Cobalt-ferrite MNP have a significant impact on various magnetic properties, such as the magnitude of the barrier energy, coercive and nucleation fields, magnetization rate, magnetization curve profile, and magnetization mode.Cobalt-ferrite MNP with a size of 10 nm shows a single domain with a relatively short magnetization reversal time and high coercive field.
A micromagnetic study: lateral size dependence of the macroscopic properties of rectangular parallelepiped Cobalt-ferrite nanoferromagnetic Nur Aji Wibowo; Susatyo Pranoto; Cucun Alep Riyanto; Andreas Setiawan
Journal of Physics: Theories and Applications Vol 4, No 1 (2020): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jphystheor-appl.v4i1.46692

Abstract

The purpose of this study is to provide systematic information through micromagnetic simulations related to the impact of particle size on the magnetic characteristics of Cobalt-ferrite MNP. The micromagnetic computations performed were based on LLG equation. The MNPs sample was simulated in the form of a rectangular parallelepiped with a thickness of 20 nm and square surface with lateral length varies from 10 to 80 nm at an interval of 10 nm. The results of this study indicate that the size changes in Cobalt-ferrite MNP have a significant impact on various magnetic properties, such as the magnitude of the barrier energy, coercive and nucleation fields, magnetization rate, magnetization curve profile, and magnetization mode.Cobalt-ferrite MNP with a size of 10 nm shows a single domain with a relatively short magnetization reversal time and high coercive field.
Co-Authors A. Oktaviara Adita Sutresno Aji, P. P. Albertus Sigit Pradipta 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 Edi Suharyadi Eklesias Donesi Andresta Elfira Josmin Fillimditty Ferdy Rondonuwu Ferdy S. Rondonuwu Ferdy Semuel Rondonuwu Fransisca Indra Dewi Giner Maslebu Guritna, Edi Hafidz Bahtiar Hanny Hafiar Hidayatullah, Muhammad Istiqomah, Nurul Imani Ivana Helga Iriani Jodelin Muninggar, Jodelin Lilik Linawati Lilik Linawati Litta Marlin Patty M. R. S. Shanti Made R. S. S. N. Ayub Mamea, Cinndy Angel Mayasari, Anisa Purwoko, Agus Putri, Dera Anastasya Rahardian, Renaldy Baptista Rendi Hadi Perdana Sari, Emi Kurnia Shinta Monika Utami Siswantika, Priskila Harli Wachid Susilo