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All Journal Journal of Science and Applicative Technology Molekul: Jurnal Ilmiah Kimia Indonesian Journal of Physics (IJP)
Akbar, Fiki Taufik
Theoretical High Energy Physics And Instrumentations Research Group, Institut Teknologi Bandung
Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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Density Functional Study on Benzene, Toluene, Ethylbenzene and Xylene Adsorptions on ZnO(100) Surface Nugraha Nugraha; Adhitya Gandaryus Saputro; Mohammad Kemal Agusta; Fiki Taufik Akbar; Aditya Dimas Pramudya
Molekul Vol 14, No 1 (2019)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1092.025 KB) | DOI: 10.20884/1.jm.2019.14.1.501

Abstract

We study the interaction between benzene, toluene, ethylbenzene and xylene (BTEX) molecules with ZnO(100) surface by means of density functional theory-based calculations. We find that these interactions result in the physical adsorptions of BTEX gases with adsorption distances larger than 2 Å. These adsorptions are governed by the van der Waals interaction instead of the covalent interaction. We also find that the trend of the strength of BTX adsorptions on ZnO(100) surface  is in line with the experimental trend of sensitivity of ZnO material towards BTX gases (benzene < tolune < xylene). We explain this relation by using one of the sensing mechanism within the ionosorption model. By using this relation, we also predict that the response of ZnO towards ethylbenzene will be similar to the response towards toluene since these two molecules have similar adsorption energies on ZnO(100) surface. 
Einstein-Klein-Gordon System in Higher Dimensional Mirda Prisma Wijayanto; Fiki Taufik Akbar Sobar; Bobby Eka Gunara
Indonesian Journal of Physics Vol 32 No 2 (2021): Vol 32 No 2 (2021)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (195.785 KB) | DOI: 10.5614/itb.ijp.2021.32.2.4

Abstract

In this present work, we study the Einstein equation coupled with the nonlinear Klein-Gordon equation. We obtain Ricci tensor, scalar curvature, and Einstein equation of the Einstein-Klein-Gordon system in higher dimensional. If we put D=4, our formulations reduce to the four dimensional Einstein-Klein-Gordon system.
Scalar-Torsion Theories in Four Dimensional Static Spacetimes Mulyanto .; Fiki Taufik Akbar; Bobby Eka Gunara
Indonesian Journal of Physics Vol 32 No 2 (2021): Vol 32 No 2 (2021)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (176.309 KB) | DOI: 10.5614/itb.ijp.2021.32.2.3

Abstract

In this paper, we consider a class of static spacetimes scalar-torsion theories in four dimensioanal static spacetimes with the scalar potential turned on. We discover that the 2-dimensional submanifold must admit constant triplet structures, one of which is the torsion scalar. This indicates that these equations of motion can be reduced to a single highly non-linear ordinary differential equation known as the master equation. Then, we show that there are no exact solution of the scalar-torsion theory in four dimensions considering the Sinh-Gordon potential.
Blow-up Dynamics of Higher Dimensional Klein-Gordon Equation with Nonminimal Coupling in Subcritical Case Mirda Prisma Wijayanto; Fiki Taufik Akbar; Bobby Eka Gunara
Indonesian Journal of Physics Vol 33 No 1 (2022): Vol 33 No 1 (2022)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (273.761 KB) | DOI: 10.5614/itb.ijp.2022.33.1.5

Abstract

The aim of this present work is to study the blow-up dynamics and lifespanestimate for solution to higher dimensional Klein-Gordon Equation in subcritical case, in which1 < p < psc. We construct the equation of motion from the Lagrangian of Klein-Gordon withnon-minimal coupling, where the coupling interaction of the scalar field is proportional to thescalar curvature of the spacetime. The equation of motion has the form like nonlinear dampedwave equation with mass. The novelty of this work is the time dependent of nonlinear term. Weuse test function method to proof the lifespan estimate.
Reaksi Hidrogenasi Metoksida Menjadi Metanol pada Klaster Pd6Ni Adhitya Gandaryus Saputro; Fiki Taufik Akbar
Journal of Science and Applicative Technology Vol 1 No 2 (2017): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (271.409 KB) | DOI: 10.35472/281427

Abstract

Kami melakukan kajian teoretis mengenai reaksi hidrogenasi metoksida (H3CO) menjadi metanol (CH3OH) pada katalis klaster Pd6Ni secara teoretis menggunakan perhitungan berbasis teori fungsional kerapatan (DFT). Reaksi ini merupakan salah satu reaksi pembatas laju pada proses konversi gas karbon dioksida (CO2) menjadi metanol. Hasil perhitungan kami menunjukkan bahwa reaksi hidrogenasi metoksida pada katalis klaster Pd6Ni memiliki energi aktivasi yang lebih baik dibandingkan dengan energi aktivasi pada katalis konvensional berbasis permukaan Cu. Hal ini disebabkan karena klaster Pd6Ni mampu menstabilkan adsorpsi molekul metanol dengan baik dan memiliki energi adsorpsi *H yang relatif lemah.
Object’s Movement Simulation with Air Drag: Aerodynamics Wall and Knuckle’s Effect Sobar, Fiki Taufik Akbar
Indonesian Journal of Physics Vol 35 No 1 (2024): vol 35 no 1 2024
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itb.ijp.2024.35.1.1

Abstract

The drag force of air and objects can be analyzed using the Stokes or Quadratic, also known as the Newtonian method. In this research, a Newtonian model was created numerically in Python using a 4th order Runge-Kutta integrator. The integrator will solve the acceleration function experienced by the object when given air resistance into a position function. The object’s movement influenced by variation of drag’s coefficient will provide variations in the location of the aerodynamic wall, the condition when the object moves vertically downwards. The movement of an object that is influenced by air resistance under certain conditions will also experience a lifting force, due to the rotational orientation angle of the object. The movement of objects influenced by these two forces can be modeled as knuckle movement. The results obtained from the numerical solution of the two object conditions are then made into a simple application in the form of a GUI so that users can easily operate the object simulation. This research will be a solution for students to understand the motion of objects influenced by the drag forces that occur when taking classical mechanics courses.
Co-Authors Adhitya Gandaryus Saputro Aditya Dimas Pramudya Bobby Eka Gunara Mirda Prisma Wijayanto Mohammad Kemal Agusta Mulyanto . Nugraha Nugraha