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All Journal JURNAL PENDIDIKAN TAMBUSAI Jurnal Ilmu Fisika
Zettira, Zahara
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Astronomy Earth & Planetary Sciences Materials Science & Nanotechnology Physics Social Sciences

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Efficiency at Maximum Power of Endoreversible Quantum Otto Engine with Partial Thermalization in 3D Harmonic Potential Zettira, Zahara; Sutantyo, Trengginas Eka Putra; Abdullah, Zulfi
Jurnal Ilmu Fisika Vol 16 No 1 (2024): March 2024
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.16.1.22-33.2024

Abstract

We study the partial thermalization to the effect of efficiency at maximum power (EMP) of a quantum Otto engine using Bose-Einstein Condensation in 3D harmonic potential. Partial thermalization occurs at a finite-time isochoric process, preventing the medium from achieving equilibrium with reservoirs, leaving it in a state of residual coherence. Under these circumstances, the performance of the engine can be seen from its power and EMP. The 3D harmonic potential is used to generate an excitation of energy during the expansion and compression. The total energy is defined by the total work done in a cycle. Using Fourier’s law in conduction, we found that power explicitly depends on the duration of heating and cooling stroke time and efficiency of the engine; that is the higher stroke time and efficiency, the less power output. In order to find EMP, we maximize power with respect to compression ratio κ, and we found that EMP also depends on the isochoric heating and cooling process. By varying the stroke time of the isochoric process, EMP slightly decreases with increasing isochoric time due to entropy production. However, adjusting cooling stroke time more extended than heating stroke time could significantly improve the EMP of Otto Engine.
Efficiency at Maximum Power of Endoreversible Quantum Otto Engine with Partial Thermalization in 3D Harmonic Potential Zettira, Zahara; Sutantyo, Trengginas Eka Putra; Abdullah, Zulfi
Jurnal Ilmu Fisika Vol 16 No 1 (2024): March 2024
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.16.1.22-33.2024

Abstract

We study the partial thermalization to the effect of efficiency at maximum power (EMP) of a quantum Otto engine using Bose-Einstein Condensation in 3D harmonic potential. Partial thermalization occurs at a finite-time isochoric process, preventing the medium from achieving equilibrium with reservoirs, leaving it in a state of residual coherence. Under these circumstances, the performance of the engine can be seen from its power and EMP. The 3D harmonic potential is used to generate an excitation of energy during the expansion and compression. The total energy is defined by the total work done in a cycle. Using Fourier’s law in conduction, we found that power explicitly depends on the duration of heating and cooling stroke time and efficiency of the engine; that is the higher stroke time and efficiency, the less power output. In order to find EMP, we maximize power with respect to compression ratio κ, and we found that EMP also depends on the isochoric heating and cooling process. By varying the stroke time of the isochoric process, EMP slightly decreases with increasing isochoric time due to entropy production. However, adjusting cooling stroke time more extended than heating stroke time could significantly improve the EMP of Otto Engine.
Analisis Pengaruh Product Knowledge terhadap Perilaku Konsumen Munthe, Cindi Alichia; Daniel, Muhammad; Rusadi, Muhammad Syauqan; Roidias, Raja Havizul; Zettira, Zahara; Nofirda, Fitri Ayu
Jurnal Pendidikan Tambusai Vol. 8 No. 1 (2024): April 2024
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jptam.v8i1.13168

Abstract

Meningkatnya kebutuhan saat ini untuk menggunakan Internet dan jejaring sosial memfasilitasi akses dan berbagi informasi tentang fenomena baru, khususnya toko online. Penelitian ini berfokus pada pengaruh pengetahuan produk dan citra merek terhadap perilaku konsumen. Permasalahan yang ditemui dalam penelitian ini antara lain bagaimana pengetahuan produk mempengaruhi perilaku konsumen e-commerce di Indonesia. Tujuan dari penelitian ini adalah untuk memahami dan menganalisis pengaruh pengetahuan produk terhadap perilaku konsumen dan menggali pentingnya memahami pengetahuan produk agar dapat memperhatikan pergerakan pesaing untuk mencari informasi produk terkini akan dijual dan dipasok. Metode yang digunakan dalam penelitian ini adalah metode deskriptif kuantitatif. Dalam penelitian ini peneliti menggunakan teknik observasi, wawancara, dan pencatatan untuk mengumpulkan data-data yang diperlukan dalam penelitian ini. Hasil penelitian menunjukkan bahwa pengetahuan produk mempunyai pengaruh positif dan signifikan terhadap perilaku konsumen. Meningkatnya penggunaan Internet mengharuskan bisnis untuk menyediakan layanan online,termasuk situs web atau layanan online lainnya, untuk meningkatkan kesadaran merek,pengetahuan produk, dan niat membeli.
Co-Authors Daniel, Muhammad Munthe, Cindi Alichia Nofirda, Fitri Ayu Roidias, Raja Havizul Rusadi, Muhammad Syauqan Trengginas Eka Putra Sutantyo Zulfi Abdullah