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All Journal POSITRON ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Lumbung Inovasi: Jurnal Pengabdian Kepada Masyarakat INSECTA: Integrative Science Education and Teaching Activity Journal Jurnal Kolaboratif Sains Inovasi Fisika Indonesia (IFI) JSEP (Journal of Science Education and Practice) Unnes Science Education Journal Journal of Dedication in Community (JoDiC)
Firdaus, Rohim Aminullah
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Journal : POSITRON

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Effect of Heat Leakage on Relativistic Quantum Lenoir Engine Performance with a Massless Boson as Working Substance in the Infinite Potential Box Saputra, Yohanes Dwi; Rahastama, Swastya; Firdaus, Rohim Aminullah
POSITRON Vol 14, No 1 (2024): Vol. 14 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v14i1.64658

Abstract

A study on the effect of heat leakage on power output, thermal efficiency, and reversibility rate in a relativistic quantum Lenoir engine has been conducted. Initially, we analogize the quantum working substance of the engine, a massless boson trapped in an infinite potential box with a movable right wall, as an ideal gas confined in a pistoned cylinder. Then, the total work, heat input, and heat output of each engine cycle which consists of isochoric, adiabatic expansion, and isobaric compression are extracted by applying the concept of quantum thermodynamics. Finally, power output, thermal efficiency, and reversibility rate of the engine are calculated for different variations of the heat leakage constant. The results are the relationship between several parameters which are expressed in the graph of thermal efficiency vs. compression ratio, graph of efficiency/normal efficiency vs. compression ratio, power output vs. efficiency, and reversibility rate vs. compression ratio. The conclusion is that an increase in heat leakage has an effect on reducing the efficiency and reversibility rate of the engine but does not affect its power output. This work will provide a new chapter for further research related to the use of the boson particle as a working substance in the quantum heat engine, especially the study of the heat leakage effect on engine performance.
Simulation of Quantum Tunnelling in Semiconductors: Analysis of Barrier Thickness Variation through the High Order FDTD Method Firdaus, Rohim Aminullah; Kurniawan, Ananda Rossy; Latifah, Eny; Saputra, Yohanes Dwi; Masulah, Bidayatul; Winarno, Nanang
POSITRON Vol 14, No 2 (2024): Vol. 14 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v14i2.82415

Abstract

The time-dependent Schrödinger equation is fundamental to quantum mechanics, describing the temporal evolution of quantum systems. This research presents a High-Order Finite-Difference Time-Domain (HO-FDTD) method, employing Taylor series expansion to solve the equation with enhanced efficiency and accuracy. By advancing beyond traditional methods like first-order Taylor series (Crank-Nicolson, forward or backward Euler) or computationally intensive Runge-Kutta schemes, the HO-FDTD method leverages higher-order Taylor expansion for the time evolution operator while simultaneously refining the Laplacian operator. This dual improvement enhances precision, allowing for accurate modeling of complex quantum phenomena. Focusing on quantum tunneling, a critical process where electrons traverse potential barriers despite insufficient classical energy, the study examines tunneling probabilities and electron behavior across barriers of varying thickness in semiconductors. The simulations reveal that thicker barriers reduce tunneling probabilities, amplify deviations in electron positions, and indicate energy transfer during interactions, with increased resistance lowering kinetic energy and raising potential energy. These findings emphasize the significant influence of barrier thickness on quantum tunneling and highlight the HO-FDTD method"™s capability to capture intricate quantum dynamics, establishing it as a robust tool for advancing research and applications in quantum mechanics.
Co-Authors Achmad Samsudin Adella Juniar Safitri Afifah, Ratih Mega Ayu Afiyah Nikmah Al-Hilalliyah, Shafiyyah Anes Liovi Putri Tse, Bertina Annastasya, Fira Maya Briantoko, Elang Rimba Rimba Damopolii, Insar DZULKIFLIH Dzulkiflih, Dzulkiflih Dzulkiflih, FNU Endah Rahmawati Endah Rahmawati Eny Latifah, Eny Fadhilah, Nisa'ul Febriani, Cornelia Khoiro, Muhimmatul Kurniawan, Ananda Rossy Lathifah Dika Mauludi Lilit Rusyati Lutfi Rohman Masulah, Bidayatul Meta Yantidewi Muhimmatul Khoiro Mustikasari, Vita Ria Mutmainnah Mutmainnah Nanang Winarno Nikmah, Afiyah Nugrahani Primary Putri Nugrahani Primary Putri NUR OCTAVINA, CHOIRINA RACHMA Prasetyo, Dhenatra Rifqy Rahastama, Swastya Ramadani, Riski Riski Ramadani Safina Ayu Damayanti Saputra, Winata Tegar Sihombing, Rizky Agassy Syauqi, Salma Kaisan Ula, Rini Khamimatul Yantidewi, Meta Yohanes Dwi Saputra, Yohanes Dwi