Indonesia Conference Directory

Corresponding Author
Khazali Fahmi

Institutions
a) Theoretical Physics Laboratory, THEPI Division, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, West Java, Indonesia.
*khazali.fahmi[at]students.itb.ac.id
b) Indonesian Center for Theoretical and Mathematical Physics (ICTMP), Jl. Ganesha 10 Bandung 40132, West Java, Indonesia.

Abstract
In this article we discuss the matrix elements of volume operator in (2+1) Euclidean Loop Quantum Gravity. The Euclidean signature is chosen because it has the same group as (3+1) Lorentzian Loop Quantum Gravity that is SU (2). The techniques used follows what has been done on the volume operator in (3+1) Lorentzian Loop Quantum Gravity. Although both are referred to as volume operator, they both have signicantly dierent forms, so the initial steps of the discussion will be dierent. The result show that we can express the matrix elements in terms of standard recoupling scheme basis.

Keywords
Loop Quantum Gravity, Volume operator.

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/ftbyRkFXmVNK

Corresponding Author
Kamila Permata

Institutions
Astronomy Department, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia
kamilapermata13[at]gmail.com

Abstract
Sunspots are darker, cooler areas on the surface of the sun and have strong magnetic field. The morphology of the sunspots group is classified into seven types based on the Zurich classification. The Zurich classification was modified and expanded to improve the objectivity of the definition of sunspot classification. The modified classification is called McIntosh classification that has other parameters to classified sunspot such as size, stability, and complexity. Sunspot has proper motion - the result of the interaction between solar rotation, magnetic field, and convection. In this study, we measured the coordinates of 304 sunspots umbra as tracer in the rising phase of the solar cycle 24th to obtain the relation of sunspots umbras velocity to Zurich and McIntosh classification. Coordinates of sunspots were measured using AIA images at a wavelength of 4500 Å from SDO (Solar Dynamic Observatory) with JHelioviewer software. From the measurement, we got that for the penumbral class in McIntosh classification, x class (no penumbra) and r class (incomplete penumbra) has the largest latitudinal and longitudinal velocity. For the sunspot distribution in McIntosh classification, i class (intermediate) and c class (compact) has highest latitudinal and longitudinal velocity.

Keywords
Sunspots; Proper motion of sunspots; Zurich and McIntosh classification

Topic
Earth and Planetary Sciences

Link: https://ifory.id/abstract/ZpkeUButbEK2

Corresponding Author
Adhitya Gandaryus Saputro

Institutions
a) Engineering Physics Program, Faculty of Industrial Technology, Institut Teknologi Bandung, Jl.Ganesha 10, Bandung 40132, Indonesia
b) Advanced Functional Materials Research Group, Institut Teknologi Bandung, Jl.Ganesha 10, Bandung 40132, Indonesia
c) Research Center for Nanosciences and Nanotechnology, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132, Indonesia
d) Engineering Physics Program, Institut Teknologi Sumatera (ITERA), Jl Terusan Ryacudu, Lampung 35365, Indonesia

Abstract
Research on the reduction of carbon dioxide (CO2) level in the atmosphere has become one of major research topics worldwide. One of those researches is to convert CO2 into other valuable chemical substances such as methanol and formic acid through hydrogenation process. However, by using conventional industrial catalysts such as Cu-based catalyst as an agent for CO2 hydrogenation, the cost of reaction can be very energy taxing due to the inability of the catalyst to interact properly with CO2 molecule. Recently, many researches regarding new catalysts emerge such as Ni-based catalysts. In this study, we try to use small size Ni cluster supported on graphitic material as an alternative for CO2 hydrogenation catalyst. As an initial step, we study the ability of the supported Ni cluster to interact with CO2 molecule utilizing density functional theory-based calculations. We find that CO2 molecule can be strongly adsorbed on the Ni-Ni site of the supported Ni cluster with a bidentate adsorption configuration. The formation of this CO2 bidentate adsorption configuration will reduce the required activation energies for the subsequent CO2 hydrogenation reaction steps.

Keywords
CO2; Nickel cluster; graphene; adsorption; density functional theory

Topic
Condensed Matter Physics

Link: https://ifory.id/abstract/uRhvpP7mWyqJ

Corresponding Author
Sabiq Fatoni

Institutions
Institut Teknologi Bandung

Abstract
Nuclear energy is one of the alternative energy sources to resolve the increasing needs of energy sources. Small Modular reactor (SMR) is one type of small nuclear reactor that can be resolve energy needs for remote areas. In this study, variations of fuel were carried out on the NuScale SMR reactor were Thorium with Plutonium (reactor grade plutonium), Thorium with enrichment Uranium, and Thorium with U-233. This study aims to determine the composition of the fuel that makes the reactor capable in a critical state for 10 years with a power of 150MWth. Variations in the composition concentration of Plutonium, concentration and enrichment of natural uranium, and concentration U233 were carried out on the NuScale reactor core. Neutronic analysis was carried out using the SRAC2006 program with JENDL4.0 on the LINUX operating system, which resulted in the value of the multiplication factor, conversion ratio, and reactor reactivity values. Based on calculations and simulations critical reactor (Keff ≥ 1) was produced for 10 years with a composition of 4.47% Plutonium in Th-Pu, 14%, 13%, and 12% Uranium with 17%, 18%, and 19% enrichment in Th-U, and 1,8% Uranium-233 in Th-U233. The reactor reactivity shows that the value is always positive and tends to decrease every year so the reactor is safe. Value of conversion ratio (CR) < 1 so that it can be used to reduce plutonium waste from other reactors

Keywords
Conversion Ratio , Multiplication Factor, NuScale, SRAC2006, Thorium

Topic
Nuclear Science and Engineering

Link: https://ifory.id/abstract/QUP9EFh7ZXyJ