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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 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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Journal : Jurnal Matematika

 1 
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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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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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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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.
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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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%.
Pengembangan Material Sorben Berbasis Zeolite dan Clay Alam se-bagai Media Desalinasi Air Laut Wibowo, Edy; Rokhmat, Mamat; Sutisna, Sutisna; Khairurrijal, Khairurrijal; Abdullah, Mikrajuddin
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
Publisher : Institut Teknologi Bandung

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Abstract

We have developed a sorbent based natural materials for seawater desalination application. We used clays, soil, rock and zeolite as raw materials. We conducted a thermal activation process to improve the sorption ability of the materials. The sorption ability of materials were tested to reduce the salinity of seawater and it is expressed by the reduction efficiency. The highest reduction efficiency (4%) was obtained from the activation of the soil at temperature of 600 ° C and the zeolite at a temperature of 200 ° C. It can be seen that the reduction efficiency was linearly increased with the increase of the doses of sorbent. We observed that the sorption ability of zeolite can be enhanced through thermal activation at a relatively low temperature so that it was potentially used as a low-cost sorbent material for seawater desalination.
Pengaruh Perbandingan Molaritas Prekursor terhadap Fotoluminesensi BCNO yang Disintesis dengan Metode Hidrotermal Septia Mahen, Ea Cahya; Nuryadin, Bebeh Wahid Nuryadin Wahid; Iskandar, Ferry; Abdullah, Mikrajuddin; Khairurrijal, Khairurrijal
Jurnal Matematika dan Sains Vol 18 No 3 (2013)
Publisher : Institut Teknologi Bandung

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Abstract

Abstrak Fosfor BCNO yang terdispersi pada likuid telah berhasil disintesis menggunakan metode hidrotermal. Bahan dasar (prekursor) yang digunakan adalah asam borat [B(OH)3] sebagai sumber boron, urea [(NH2)2CO] sebagai sumber nitrogen, dan asam sitrat (C6H8O7)sebagai sumber karbon. Dalam penelitian ini, telah dilakukan variasi rasio molar nitrogen terhadap boron (N/B) dan rasio molar karbon terhadap boron (C/B) dan pengaruhnya terhadap pendaran fosfor BCNO yang dihasilkan. Hasil karakterisasi spektrum fotoluminesen dari sampel yang dibuat menunjukkan bahwa pendaran fosfor BCNO mempunyai puncak emisi tunggal disekitar warna biru (~450 nm) ketika dieksitasi dengan sinar UV(365 nm). Intensitas pendaran dipengaruhi oleh kadar karbon terhadap kandungan boron (C/B) dan kadar nitrogen terhadap kandungan boron (N/B). Penambahan kadar karbon dan nitrogen diketahui dapat meningkatkan intensitas pendaran. Sedangkan intensitas optimum pendaran fosfor BCNO dicapai pada saat ratio molar C/B = 1 dan N/B =20. Kata kunci: Fosfor BCNO, Spektrum fotoluminesen, Metode hidrotermal. Influence of Precursor Molar Ratio on the BCNO Photoluminescence synthesized by Hydrothermal Method Abstract BCNO phosphor which is dispersed into liquid has been successfully synthesized by using hydrothermal method. The precursor consists of the borate acid [B(OH)3] as boron source, urea [(NH2)2CO] as nitrogen source, and citric acid (C6H8O7) as carbon source. In this research, molar ratio variations of nitrogen and carbon  towards boron (N/B and C/B), and their influence on resulted BCNO phosphor luminescence were done. The characterization results of the sample shows the single peak of BCNO phorphorous luminescence around blue color (~450 nm) on the photoluminescence spectrum, when excited by UV light (365nm). The photoluminescence intensity was affected by the ratio N/B and C/B. The increase of carbon and nitrogen ratio can increase the photoluminescence intensity. The optimum intensity of BCNO phosphor photoluminescence was obtained at the molar ratio N/B = 20 and C/B =1. Keywords : BCNO phosphor, Photoluminescence spectrum, Hydrothermal method.
Aktivitas Fotokatalitik TiO2 yang Dilapiskan pada Polipropilena Berbentuk Lembaran dan Butiran Sutisna, Sutisna; Rokhmat, Mamat; Wibowo, Edy; Rahmayanti, Handika Dany; Khairurrijal, Khairurrijal; Abdullah, Mikrajuddin
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
Publisher : Institut Teknologi Bandung

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Abstract

The sheet and granule of polypropylene (PP) have been used as the support material for TiO2 catalyst. The TiO2 powder was coated to the polymer surface using a combination of electrostatic and heating methods (for the PP sheet) and thermal milling method (for PP granule). The photocatalytic testing of catalysts conducted on a 300 ml solution of Methylene Blue (MB) with initial concentration of 25 ppm. Under solar ilumination, the catalyst sheets have a higher photocatalytic activity than the catalyst granules.
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