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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
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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Sifat Listrik Film Tipis SrTiO3 untuk Kapasitor MOS Darsikin Darsikin; Khairurrijal Khairurrijal; Sukirno Sukirno; Mohamad Barmawi
Jurnal Matematika & Sains Vol 10, No 3 (2005)
Publisher : Institut Teknologi Bandung

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Abstract

Strontium titanate (SrTiO3) film was successfully deposited on a silicon substrate by using a pulsed-laser ablation deposition (PLAD) technique. The optimum temperature is 600o C. The electrical properties measurement was metal-oxide-semiconductor capacitor. The film exhibits good insulating property at room temperature. The fixed charge density and leakage current density were also calculated. The results show that the films have promising applications as alternative gate dielectrics.
Kapasitor MOS dengan dielektrik Ceria Amorf Khairurrijal Khairurrijal; Darsikin Darsikin; Maman Budiman
Jurnal Matematika & Sains Vol 9, No 3 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

Amorphous ceria (CeO2) thin films were deposited on a silicon (100) substrate by using a pulsed-laser ablation deposition (PLAD) technique. The substrate temperature was varied from 600 to 7000 C and the ambient was a pure oxygen gas at the pressure of 100 mTorr. It was found that the growth rate is 17.5 nm/min. Low fixed-charge densities (1011/cm2) and high resistivies (109-1012 Ω cm) of the CeO2 thin films indicate that the films could be used for oxide layer of metal-oxide-semiconductor (MOS) capacitors. Electron conduction mechanism in the CeO2 thin films is ohmic at voltages below 1 V while that at voltages above 1 V are due to quantum tunneling process.
Gelation Model for Porosity Dependent Fluid Permeability in Porous Materials Mikrajuddin Abdullah; Khairurrijal Khairurrijal
Jurnal Matematika & Sains Vol 14, No 1 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

A statistical theory of gel formation in a polymer matrix was used to explain the dependence of liquid permeability in porous materials. A porous material was modeled as a dispersion of bubbles in a solid matrix. Bubbles were treated as monomers and formation of infinite connected bubbles was treated as the formation of gels in polymer. The theoretical predictions were in agreement with the observed data for basalt andesits. The model can easily predict the percolation threshold of porosity at which the permeability increases suddenly, which depends on the effective number of nearest bubbles around a selected bubble. Around the percolation threshold, the permeability satisfies a scaling relationship with a critical exponent of t » 1.2. It is also identified that the critical exponent and fractal dimension of pores, D, satisfy t » 0.8 (1 + 1/D).
Dinamika Paket Gelombang Elektron yang Menerobos Penghalang Trapesium dengan Ketebalan Nanometer Maharati Hamida; Khairurrijal Khairurrijal; Mikrajuddin Abdullah
Jurnal Matematika & Sains Vol 11, No 2 (2006)
Publisher : Institut Teknologi Bandung

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Abstract

A simulation of the dynamics of electrone wave packet tunneling through a potential barrier in a MOS (metal-oxide-semiconductor) diode was performed by solving the time-dependent Schrödinger equation using the finite difference method. The wave packet is initially located in the semiconductor layer then moves toward to the oxide layer and probably tunnels through and/or is reflected by the oxide layer. The wave packet is deformed when it reaches the oxide layer. It is found that the higher the wave packet energy, the faster the wave packet moves and the higher the probability of transmitting the wave packet for the same bias voltage. It was also found that at low energy, the increase of bias voltage does not increase significantly the probability of finding the transmitted wave packet. At high energy, however, the probability of finding the transmitted wave packet becomes higher with increasing the bias voltage.
Fabrication of Microporous Water Filter Using Titanium Dioxide Particles, Silica Particles, and Polyethylene Glycol Priatama, Aris; Abdullah, Mikrajuddin; Khairurrijal, Khairurrijal; Mahfudz, Hernawan
Journal of Engineering and Technological Sciences Vol 42, No 1 (2010)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (561.473 KB) | DOI: 10.5614/itbj.eng.sci.2010.42.1.3

Abstract

We report the fabrication of microporous filter for use in filtering both inorganic  and  organic  substances  from  liquid  materials.  Titania  (TiO 2)  anatase was  used  as  the  main  material  for  this  filter.  Polyethylene  glycol  (PEG)  with average  molecular  weight  of  20,000  was  also  used  as  additive  to  control  the formation  of  pores,  especially  pore  sizes.  The  mixture  of  titania  and  PEG  was pressed into cylindrical tablet shape at room temperature  and then simply heated inside a furnace up to temperature where the PEG decomposed into gas to leave only connected titania particles. The use of titania as base material for the filter allows  the  organic  substances  that  trapped  inside  the  filter  pores  to  be  easily removed by heating up the used filter at above decomposition temperature of the trapped  organics.  We  also  made  other  filter  by  adding  small  amount  of  silica (SiO2)  particles  to  reduce  the  size  of  the  pores  as  well  as  to  improve  the mechanical  strength.  We  observed  that  filters  containing  silica  particles,  with smaller  in  size  compared  to  titania,  resulted  in  better  mechanical  strength, smaller in pore sizes and better filtering results in term of turbidity and dissolved oxygen (DO) content. This  method is potential for development of larger scale and cheaper water filters for use in various applications.
SINTESIS NANOSERAT POLI(VINIL ALKOHOL) DALAM BENTUK LEMBARAN DENGAN PEMINTAL ELEKTRIK MULTI NOZEL DAN KOLEKTOR DRUM Nuryantini, A. Y.; Ekaputra, M. P.; Munir, M. M.; Suciati, T.; -, Khairurrijal
Jurnal Pendidikan Fisika Indonesia Vol 10, No 2 (2014): July 2014
Publisher : Physics Department, Faculty of Mathematics and Natural Sciences, Semarang State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpfi.v10i2.3455

Abstract

Sistem pemintalan elektrik jarum tunggal dan kolektor bidang memiliki kelemahan, yaitu laju produksi yang rendah. Untuk mengatasinya digunakan sistem jarum banyak yang berjejer (multi nozel) dan kolektor berbentuk silinder berputar (kolektor drum). Banyaknya jarum dimaksudkan untuk menambah laju produksi, kolektor drum berputar dimaksudkan agar dihasilkan nanoserat dalam bentuk lembaran yang seragam. Tujuan penelitian adalah untuk menguji pengaruh medan listrik pada proses pemintalan elektrik multi nozel dan kolektor drum berputar, serta mengontrol morfologi nanoserat poli(vinil alkohol)/PVA yang dihasilkan dengan cara mengubah laju alir larutan. Hasil penelitian yang didapat adalah: (1) telah berhasil dibuat nanoserat PVA dalam bentuk lembaran yang menumpuk di kolektor drum, (2) pada pemintalan elektrik dengan sistem multi nozel terjadi distorsi medan listrik pada ujung jarum yang menyebabkan serat pada kolektor tidak rata, (3) morfologi nanoserat PVA yang dihasilkan pada laju alir 0,4 dan 0,6 ml/jam banyak mengandung butiran, sedangkan pada laju alir 0,8 ml/jam jumlah butiran berkurang.ABSTRACTElectrospinning system with single needle and planar collector has the disadvantage of a low productivity. To overcome this problem drum collector and multi-nozzle system were employed. The multi-nozzle system was used to improve the production rate, while the drum collector was used for maintaining the uniformity of the size. The purposes of this study were to examine the influence of electric field in the electrospinning process and to control the morphology of the obtained poly(vinyl alcohol)/PVA nanofibers by changing the solution flow rate. The obtained results were: (1) PVA nanofibers membrane have been successfully produced stacked on the drum collector, (2) distortion of the electric field at the tip of the needle was occurred, which results in inhomogeneous thickness of the stacked nanofibers, and (3) the morphology of the obtained nanofibers at the flow rates of 0.4 and 0.6 ml/hour have many beads while at 0.8 ml/hour the number of beads decreased.
SINTESIS NANOSERAT POLI(VINIL ALKOHOL) DALAM BENTUK LEMBARAN DENGAN PEMINTAL ELEKTRIK MULTI NOZEL DAN KOLEKTOR DRUM Nuryantini, A. Y.; Ekaputra, M. P.; Munir, M. M.; Suciati, T.; -, Khairurrijal
Jurnal Pendidikan Fisika Indonesia Vol 10, No 2 (2014)
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpfi.v10i2.3455

Abstract

Sistem pemintalan elektrik jarum tunggal dan kolektor bidang memiliki kelemahan, yaitu laju produksi yang rendah. Untuk mengatasinya digunakan sistem jarum banyak yang berjejer (multi nozel) dan kolektor berbentuk silinder berputar (kolektor drum). Banyaknya jarum dimaksudkan untuk menambah laju produksi, kolektor drum berputar dimaksudkan agar dihasilkan nanoserat dalam bentuk lembaran yang seragam. Tujuan penelitian adalah untuk menguji pengaruh medan listrik pada proses pemintalan elektrik multi nozel dan kolektor drum berputar, serta mengontrol morfologi nanoserat poli(vinil alkohol)/PVA yang dihasilkan dengan cara mengubah laju alir larutan. Hasil penelitian yang didapat adalah: (1) telah berhasil dibuat nanoserat PVA dalam bentuk lembaran yang menumpuk di kolektor drum, (2) pada pemintalan elektrik dengan sistem multi nozel terjadi distorsi medan listrik pada ujung jarum yang menyebabkan serat pada kolektor tidak rata, (3) morfologi nanoserat PVA yang dihasilkan pada laju alir 0,4 dan 0,6 ml/jam banyak mengandung butiran, sedangkan pada laju alir 0,8 ml/jam jumlah butiran berkurang.ABSTRACTElectrospinning system with single needle and planar collector has the disadvantage of a low productivity. To overcome this problem drum collector and multi-nozzle system were employed. The multi-nozzle system was used to improve the production rate, while the drum collector was used for maintaining the uniformity of the size. The purposes of this study were to examine the influence of electric field in the electrospinning process and to control the morphology of the obtained poly(vinyl alcohol)/PVA nanofibers by changing the solution flow rate. The obtained results were: (1) PVA nanofibers membrane have been successfully produced stacked on the drum collector, (2) distortion of the electric field at the tip of the needle was occurred, which results in inhomogeneous thickness of the stacked nanofibers, and (3) the morphology of the obtained nanofibers at the flow rates of 0.4 and 0.6 ml/hour have many beads while at 0.8 ml/hour the number of beads decreased.
Effect of Polystyrene Latex Addition on Size and Pore Volume of Porous Calcium Oxide Particles Prepared by Spray-Pyrolysis Method and Its Ability for SO2 Retention Septianto, Ricky Dwi; Iskandar, Ferry; Abdullah, Mikrajuddin; Khairurrijal, Khairurrijal; Hwa, Lee Myong
Journal of Engineering and Technological Sciences Vol 50, No 2 (2018)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3896.008 KB) | DOI: 10.5614/j.eng.technol.sci.2018.50.2.6

Abstract

In this study, the effects of polystyrene (PS) latex addition on the particle morphology and the pore content of calcium oxide (CaO) were investigated. The CaO particles were prepared using an ultrasonic nebulizer-assisted spray-pyrolysis method with variation of the PS/Ca(NO3)2·4H2O mass ratio in the precursor. Good crystallinity of CaO was obtained at 825°C of synthesis temperature under 2 l/min of nitrogen gas flow, which was confirmed by Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD). According to scanning electron microscope (SEM) characterization, the CaO particles synthesized with 0 and 25 wt% PS addition had an almost spherical shape with an average size of 1.58 and 1.48 µm, respectively. In addition, macropores were formed in the CaO particles prepared with 25 wt% PS addition that had an average pore diameter of 583.26 nm. Meanwhile, the CaO particles prepared with 75 wt% PS addition had a random shape and an average size of 1.41 µm. The mesopore content was investigated by Barret-Joyner-Halenda (BJH) analysis, which showed improvement of the pore size from 3.45 nm to 5.42 nm for 0 and 25 wt% PS addition, respectively, which is proportional to the pore volume, pore surface area, and the capacity of SO2 retention.
Axial and Lateral Small Strain Measurement of Soils in Compression Test using Local Deformation Transducer Nawir, Hasbullah; Apoji, Dayu; Ekawita, Riska; Khairurrijal, Khairurrijal
Journal of Engineering and Technological Sciences Vol 50, No 1 (2018)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (634.837 KB) | DOI: 10.5614/j.eng.technol.sci.2018.50.1.4

Abstract

This paper presents the development of a method using local deformation transducers (LDTs) to locally and sensitively measure small axial and lateral strains in soil in a compression test. A local strain measurement system comprising of axial and lateral LDTs was developed referring to the original LDT system and the cantilever LDT system, respectively. The LDTs were calibrated both in air and under water. Their insensitivity to pressurized water was confirmed. The calibration factors for the axial and lateral LDTs were found to be 1.695 mm/volt and 1.001 mm/volt, respectively. The performance in terms of repeatability and stability of the LDT system was evaluated. The repeatability test showed that the average standard deviation of the lateral LDT was 0.015 volt, while the stability test showed that the average standard error of the axial and lateral LDT were 3.13 × 10-5 volt and 2.65 × 10-5 volt, respectively. Unconfined compression tests were conducted on three reconstituted clay samples to examine the proposed axial and lateral LDT system. The stress-strain relationship indicates a nonlinear relationship between the axial and lateral strain of soil instead of the conventionally assumed constant relationship. The results demonstrate this nonlinear behavior even at small strain levels, which were successfully measured using a domestically built axial and lateral LDT system.
Sintesis Nanokomposit -Fe2O3/SiO2 dengan Metode Salt-Assisted Spray Pyrolysis untuk Menurunkan Viskositas Minyak Berat Anrokhi, Mohamad Samsul; Nuryadin, Bebeh Wahid; Abdullah, Mikrajuddin; Khairurrijal, Khairurrijal; Iskandar, Ferry
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
Publisher : Institut Teknologi Bandung

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Abstract

A α-Fe2O3/SiO2 nanocomposite as aquathermolisys catalyst material at heavy oil has been synthesized and optimized by using  Salt-Assisted Spray Pyrolysis method. The α-Fe2O3/SiO2 nanocomposite is obtained by thermal decomposition from the precursor.  The precursor is made of FeCl3, SiO2 and NaCl and water as a solvent. Concentration of FeCl3, SiO2, and NaCl are 1:1:5 in order. the composition of SiO2 in the composite is 0%, 25% and 50% of total mass, respectively. the droplets were transported to the furnace reactor using air as a carrier gas with a fixed flow rate at 5 liter/min and the furnace’s temperature is 800 °C in order to get the pyrolysis reaction. The resulted powder is then characterized by using XRD, SEM and Chatalytic aquathermolysis test. The result of XRD characterization shows that crystal peaks of α-Fe2O3 has been formed. SEM result shows nanocomposite morphology of α-Fe2O3/SiO2 with circle particle form with average particle diametre of α-Fe2O3, SiO2 25% and SiO2 50% of total mass are 765 nm, 850 nm, and 746 nm, respectively. Catalytic Aquathermolysis test showed catalyst α-Fe2O3/SiO2 50%  has catalytic properties better than catalytic properties of α-Fe2O3/SiO2 and α-Fe2O3/SiO2 25%.
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