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All Journal J-Sil (Jurnal Teknik Sipil dan Lingkungan) BERKALA FISIKA Jurnal Ilmu Dasar Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Sains Materi Indonesia Jurnal Sains dan Teknologi Nuklir Indonesia (Indonesian Journal of Nuclear Science and Technology) TELKOMNIKA (Telecommunication Computing Electronics and Control) Jurnal Pendidikan Fisika Indonesia Jurnal Matematika & Sains Journal of Mathematical and Fundamental Sciences Journal of Engineering and Technological Sciences Widyariset Science and Technology Indonesia Indonesian Journal of Chemistry Jurnal Otomasi Kontrol dan Instrumentasi WIDYA LAKSANA Jurnal Teori dan Aplikasi Fisika Indonesian Journal of Electrical Engineering and Computer Science Widyariset El-Hekam : Jurnal Studi Keislaman Pharmaceutical Sciences and Research (PSR) Indonesian Journal of Physics (IJP)

Khairurrijal Khairurrijal

Kelompok Keilmuan Fisika Material Elektronik, Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Teknologi Bandung

Author-ID : 297948

Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Neuroscience Physics Social Sciences Transportation Other

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Comparison of Electron Direct Tunneling Time in a Heterostructure with a Nanometer-Thick Trapezoidal Barrier Calculated Using Exponential and Airy Wavefunctions Fatimah A. Noor; Mikrajuddin Abdullah; Sukirno Sukirno; Khairurrijal Khairurrijal
Indonesian Journal of Physics Vol 18 No 1 (2007): Vol. 18 No. 1, January 2007
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (144.833 KB)

Analytical expressions of electron direct transmittance and tunneling time in a heterostructure with a nanometer-thick trapezoidal barrier have been derived by using the Airy wavefunctions. The analytic expressions are applied to the Si (100)/SiO2/Si (100) heterostructure. It has been found that the electron direct transmittance and tunneling time are suitably calculated by employing the Airy wavefunction as compared to those obtained under the exponential wavefunction. It has also been found that the calculated electron direct transmittance and tunneling time under the Airy wavefunction are the same as those under the exponential wavefunction for very low bias voltage and low electron incident energy.

Preliminary Study of Steels Corrosion Phenomena in Liquid Lead-Bismuth using Molecular Dynamics Methods Alan Maulana; Zaki Su'ud; Hermawan K. Dipojono; Khairurrijal Khairurrijal
Indonesian Journal of Physics Vol 18 No 1 (2007): Vol. 18 No. 1, January 2007
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (110.045 KB)

One of the prospective coolant material which can be used in the forth generation nuclear reactor is a liquid lead-bismuth. This coolant has inherent safety capability, economical, and able to burn their own nuclear waste. The problem of using this coolant is corrosion phenomena of steel occurred in the interaction with liquid lead-bismuth especially at high temperatures. Corrosion in this study is assumed as diffusion phenomena of leads or bismuths into the surface of steel. This phenomenon have been studied by molecular dynamic methods. As the first step to this investigation, the molecular dynamic program called Moldy has been used to simulate pure iron and lead system. The molecular dynamic simulation result of pure Fe system at 0 K showed that the peaks positions of radial distribution function is in a good agreement with the result from experiment. The deviation of the peaks position resulted from simulation and experiment is about 0.5%. The simulation result of Pb system showed no significant different with the result from experiment. The simulation also shows the broadening of the curves of radial distribution function and lowering the intensity at high temperature. These results indicate that the atomic positions of the system are distributed randomly.

Comparison of Electron Direct Transmittance and Tunneling Time of Si (100)/HfO2/Si (100) and Si (110)/HfO2/Si (110) Structures with Ultra-thin Trapezoidal Barrier Fatimah A. Noor; Mikrajuddin Abdullah; Sukirno Sukirno; Khairurrijal Khairurrijal
Indonesian Journal of Physics Vol 18 No 2 (2007): Vol. 18 No. 2 April 2007
Publisher : Institut Teknologi Bandung

An analytical expression of electron direct transmittance and tunneling time through a nanometer-thick trapezoidal potential barrier have been derived by using a phase-time method with Airy wavefunction solution. The expression is applied to Si(100)/HfO2/Si(100) (isotropic) and Si(110)/HfO2/Si(110) (anisotropic) structures calculated under the consideration of barrier width, incident energy, incident angle, and bias voltage. The calculated results are discussed and comparisons between the isotropic and anisotropic heterostructures are discussed.

Corrosion Study of Steels In Liquid Lead-Bismuth Cooled Nuclear Reactors by Computer Simulation using Moldy Code Alan Maulana; Zaki Su'ud; Hermawan K. Dipojono; Khairurrijal Khairurrijal
Indonesian Journal of Physics Vol 18 No 2 (2007): Vol. 18 No. 2 April 2007
Publisher : Institut Teknologi Bandung

The corrosion of steel in liquid lead-bismuth has been studied by computer simulation using MOLDY code. The diffusion processes among atoms are assumed to be the key issues to understand the corrosion mechanism microscopically. In order to simulate these diffusion processes, the inter-atomic potential between Fe-Fe, Pb-Pb, Bi-Bi, Cr-Cr and Ni-Ni are assumed to obey the Lennard-Jones potential. The Lennard-Jones potential parameters of above pairs of atom have been derived by fitting the data available in the literature with the Lennard-Jones equation. The initial positions of the system are taken from the crystal structures data including the cell parameters. The simulation cell was a box with the volume 60x30x30 Å3 that were filled by 2864 atoms. Nickel and chromium atoms were substituted into Fe crystal with the percentage 10% and 16 % respectively to construct the systems of SS-316 which contacted by 50%Pb-50%Bi. The molecular dynamic simulations have been carried out for surface interaction between steel crystal with liquid lead-bismuth for several temperatures. After done the above simulation, the simulation is then tried by using 45%Pb-55%Bi (Pb-Bi Eutectic). The results of molecular dynamic simulations for several temperatures and the effect of variation of Pb and Bi above will be presented in this paper.

The Influence of Ferromagnetic core, Pick-up Coil Winding Number and Environmental Temperature to the Output Signal of a Fluxgate Magnetic Sensor Yulkifli Yulkifli; Rahmondia N. S; Mitra Djamal; Khairurrijal Khairurrijal; Deddy Kurniadi
Indonesian Journal of Physics Vol 18 No 3 (2007): Vol. 18 No. 3 July 2007
Publisher : Institut Teknologi Bandung

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The paper explains some influence parameters of a fluxgate magnetic sensor e.g. number of ferromagnetic cores, number of pick-up coil winding and temperature. The sensors were built in three configurations of pick-up coil winding: 50x2, 60x2, and 70x2 turns, where the excitation coil was kept unchanged at 40x2 turns. The influence of ferromagnetic core and temperature were tested by using the configuration of 60x2 turns. The measurement results show that the increasing of core layer increases the measurement range: ± 100 µT (2 layers), ± 150 µT (6 layers) and ± 200 µT (10 layers). The increasing of pick-up coil winding number increases the sensor sensitivity: 260.64 mV/µT (40/50/40), 321.39 mV/µT (40/60/40) and 383.43 mV/µT (40/70/40). The increasing of temperature shifted the output signal to the higher position

Electron Transmittance through a Heterostructure on Anisotropic Materials using the Airy Function and the Transfer Matrix Method Lilik Hasanah; Adi Bagus Suryamas; Khairurrijal Khairurrijal; Mikrajuddin Abdullah; Toto Winata; Sukirno Sukirno
Indonesian Journal of Physics Vol 18 No 4 (2007): Vol. 18 No. 4, October 2007
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (295.701 KB)

Derivation of the transmittance of an electron incident on a heterostructure potential with nanometer-thick trapezoidal barrier grown on anisotropic materials is done by solving the effective-mass equation including off-diagonal effective-mass tensor elements. The analytic expressions are applied to the Si(110)/Si0.5Ge0.5/Si(110) heterostructure. It is assumed that the direction of propagation of the electrons makes an arbitrary angle with respect to the interfaces of the heterostructure and the effective mass of the electron is position dependent. The calculation of transmittances is done for incident energy at z direction below and above the barrier height by varying the applied voltage to the barrier. The maximum transmittance depends on the incident energy and the bias voltage given to the potential barrier. The transmittance value obtained from the Airy function has the same value obtained from the transfer matrix method. It was also found that the transmittance depends on the valley and it is not symmetric with the incident angle.

Structural Characteristics of Carbon Nanotubes Fabricated Using Simple Spray Pyrolysis Method Khairurrijal Khairurrijal; Mikrajuddin Abdullah; Memoria Rosi; Fatimah A. Noor
Indonesian Journal of Physics Vol 19 No 3 (2008): Vol. 19 No. 3, July 2008
Publisher : Institut Teknologi Bandung

A simple spray pyrolysis method has successfully used to synthesize carbon nanotubes (CNTs). Their structural characteristics were characterized by employing field-emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX) analysis, and X-ray diffraction (XRD) methods. FE-SEM images confirmed that the diameters of CNTs were in the range of 20 to 80 nm. The average diameter of CNTs increased considerably as the growth temperature increased (above 700 oC). The changes in growth time and ferrocene mass altered the average diameter of CNTs slightly. EDX analysis and XRD patterns indicated that Fe2O3 and Fe3O4, which originate from the oxidation of ferrocene catalyst, are the main impurities of the CNTs. The concentrations of Fe2O3 and Fe3O4 became lower and higher, respectively, for the growth temperatures higher than 700°C because Fe2O3 is the most stable at high temperatures.

Simulation of Electron Transmittance and Tunneling Current in a Metal-Oxide- Semiconductor Capacitor with a High-K Dielectric Stack of HfO2 and SiO2 Using Exponential- and Airy-Wavefunction Approaches and a Transfer Matrix Method Khairurrijal Khairurrijal; Fatimah A. Noor; Mikrajuddin Abdullah; Sukirno Sukirno
Indonesian Journal of Physics Vol 20 No 2 (2009): Vol. 20 No. 2, April 2009
Publisher : Institut Teknologi Bandung

Analytical expressions of electron transmittance and tunneling current in a metal-oxide-semiconductor (MOS) capacitor with a high dielectric constant (high-K) oxide stack of HfO2 and SiO2 and a negative bias applied to the metal gate were derived. Exponential- and Airy-wavefunction approaches were employed in deriving analytically the electron transmittance and tunneling current. A numerical approach based on a transfer matrix method was used as a standard to evaluate the analytical approaches. It was found that the transmittances obtained under the exponential- and Airy-wavefunction approaches and the TMM are matching for low electron energies, while for higher energies only the transmittances calculated by employing the Airy- wavefunction approach is the same as those computed by using the TMM. It was also found that the tunneling currents calculated by using the exponential- and the Airy-wavefunction approaches and the TMM are equal for low oxide voltages (lower than 0.5 V), while for higher oxide voltages only the tunneling currents computed under the Airy-wavefunction approach fit those obtained under the TMM. Therefore, the Airy-wavefunction approach provides a better analytical model to tunneling processes in the MOS capacitor.

A Simple Method for Determining Surface Porosity Based on SEM Images Using OriginPro Software Mikrajuddin Abdullah; Khairurrijal Khairurrijal
Indonesian Journal of Physics Vol 20 No 2 (2009): Vol. 20 No. 2, April 2009
Publisher : Institut Teknologi Bandung

We proposed a simple method for predicting surface porosity of materials based on scanning electron micrograph (SEM) images. The porosity was determined by calculating volume beneath the surface and volume beneath a flat surface, the height of which is equal to maximum height of any point on the sample’s surface. The SEM image was firstly converted into two-dimensional matrix of gray scale and all procedures were performed using instructions provided by OriginPro software. The predicted results were in good agreements with direct calculation and measurement of the samples porosities.

Effect of Alkali Compound on Morphology and Luminescence Intensity of Europium-doped Yttria Astuti Astuti; Mikrajuddin Abdullah; Khairurrijal Khairurrijal
Indonesian Journal of Physics Vol 20 No 3 (2009): Vol. 20 No. 3, July 2009
Publisher : Institut Teknologi Bandung

Luminescent particles of europium-doped yttria (Y2O3:Eu) have been synthesized by heating nitrous precursors in a solution of polyethylene glycol (PEG) matrix containing alkali compound (LiOH, NaCl, KCl, and CaCl2). High luminescence intensity at around 612 nm contributed by electron transitions in Eu3+(5D0 → 7F0, 5D0 → 7F1,5D0 → 7F2, and 5D0 → 7F3) were observed. The highest intensity was observed in samples prepared using Li compound, but he smallest particle size was observed in samples prepared using Ca compound. This approach is promising for production of submicrometer down to nanometer-sized Y2O3:Eu particles that have both small in particle sizes and high luminescence intensity which is potential for use in development of luminescence ink that can be adapted to the current ink jet printing technology.

Co-Authors A. Suhendi A. Y. Nuryantini A.A. Ketut Agung Cahyawan W Adhha, Nurul Adi Bagus Suryamas Adi Bagus Suryamas Adi Bagus Suryamas Afifah Rosyidah Agus Riyanto Ahmad Aminudin Ahmad Fahmi Alan Maulana Alan Maulana Alvian Hayu Sudibya Ambran Hartono Andika Putra Anrokhi, Mohamad Samsul Apoji, Dayu Arif Surachman Aris Priatama Aris Priatama Astuti Astuti Aunuddin Syabba Azzahwa, Taufik Bambang Ariwahjoedi Bambang Ariwahjoedi Bebeh Wahid Nuryadin Bimastyaji Surya Ramadan Cuk Imawan Darsikin Darsikin Dayu Apoji Deddy Kurniadi Djulia Onggo Edi Sanjaya Edi Wibowo Edy Wibowo Ekawita, Riska Endah Rahmawati Fatimah A. Noor Fatimah A. Noor Fatimah A. Noor Fatimah A. Noor Fatimah A. Noor Fatimah A. Noor Fatimah A. Noor Fatimah A. Noor Fatimah Arofiati Noor Fauzi Ahmad Bogas Ferry Iskandar Freddy Haryanto Freddy Haryanto H Mahfudz Hasbullah Nawir, Hasbullah Hermawan K. Dipojono Hernawan Mahfudz Hernawan Mahfudz Heru Susanto Hutapea, Alfon Hutwan Syarifuddin Hwa, Lee Myong Iis Nurhasanah Indra Wahyudin Fathonah Ismunandar Ismunandar Jarwinda Junaidi Junaidi Kurniawan, Setyo Budi Kuwat Triyana Lee Myong Hwa Lilik Hasanah Lilik Hasanah Lilik Hasanah lis Nurhasanah M. Barmawi M. M. Munir M. P. Ekaputra Maharati Hamida Maman Budiman Maman Budiman Maman Budiman Maman Budiman Maman Budiman Mamat Rokhmat Maria Evita Masturi Masturi Masturi Masturi Memoria Rosi Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Mikrajuddin Mikrajuddin Mikrajuddin Mikrajudin Abdullah Mitra Djamal Mitra Djamal Mohamad Barmawi Muhammad Fauzan Muhammad Fauzul Imron Muhammad Miftahul Munir Novriadi, Novriadi Nur A. Aprianti Rahmayanti, Handika Dany Rahmondia N. S Rajak, Abdul Ramli Ramli Ramli Ramli Rezeki, Ningsih Ricky Dwi Septianto Risa Suryana Riska Ekawita Riska Ekawita S Saehana Sekar Mentari Septia Mahen, Ea Cahya Septianto, Ricky Dwi Silvia Surini Sukirno . Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Suprijadi Suprijadi Suprijadi Suprijadi Sutisna Sutisna Syahputra, Tri Siswandi T. Suciati Tarmizi Taher Taufik Adi Nugraha Togar Saragi Toto Winata Toto Winata Toto Winata Widhya Budiawan Widhya Budiawan Yudha Gusti Wibowo Yudi Darma Yulkifli Yulkifli Zaki Suud

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