Bintoro Anang Subagyo Bintoro Anang Subagyo
Department of Physics, Institut Teknologi Sepuluh Nopember, Kampus ITS-Sukolilo Surabaya

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The Use of Dirac Oscillator as Medium Substrate for Quantum Heat Engine: Heru Sukamto, Bintoro Anang Subagyo, Agus Purwanto Heru Sukamto Heru Sukamto; Bintoro Anang Subagyo Bintoro Anang Subagyo; Agus Purwanto Agus Purwanto
Jurnal Fisika dan Aplikasinya Vol 18 No 3 (2022): October 2022 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v18i3.5282

Abstract

The research on Dirac oscillators has been increasing recently. In this paper, a quantum heat engine by means of a Dirac oscillator that interacts with the external magnetic field is proposed. Relativistic Landau energy levels are used to perform the iso-energetic cycle. The large magnetic field is set to obtain a perfect thermodynamic cycle. Some stable performances at a certain magnitude of magnetic field and expansion parameter range are obtained. When the value of efficiency is compared with the non-relativistic case, an opposite result occurs. Therefore, a quantum heat engine using a Dirac oscillator doesn’t govern like a classical oscillator.
Spinning Q-balls in Five-Dimensional Spacetime: Bintoro Anang Subagyo Bintoro Anang Subagyo Bintoro Anang Subagyo
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.v15i2.5254

Abstract

We investigate q-balls in the d=5 dimensional Minkowski spacetime background with axially symmetric ansatz. In this case, q-balls have non-zero angular momentum for spinning problems. We construct spinning q-balls in five dimensions and solve the solutions of second order elliptic partial differential equations both using analytical and numerical approach since no closed form of the equations following by appropriate boundary conditions. This work only considers the case with equal angular momentum rather than two different angular momenta. Passing the solutions, we discuss the global charge and their properties compared to Coleman q-balls. The solutions exist in some range of frequencies. The main features of q-balls are still recovered in this construction.
Local Waveforms Analysis to Estimate the Fault Plane of May 2008 Sumatra Earthquakes: Bagus Jaya Santosa, Bintoro Anang Subagyo Bagus Jaya Santosa Bagus Jaya Santosa; Bintoro Anang Subagyo Bintoro Anang Subagyo
Jurnal Fisika dan Aplikasinya Vol 13 No 2 (2017): June 2017 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v13i2.2747

Abstract

Five earthquakes source parameters in Sumatra have been estimated that occurred on May 3rd, 13th , 18-20th 2008, which earthquakes magnitude was over 5.4 Mw. To determine the earthquakes source parameters, we used three components local waveform. The seismogram data are inverted to achieve the earthquake source parameters. To investigate the depths of earthquakes, the determination used the highest value of variance reduction of waveform analysis. To identify the fault plane of the earthquakes, the H-C method is used. The research calculates also the length and width of the Fault planes.