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All Journal Jurnal Riset dan Kajian Pendidikan Fisika Journal of Dentistry Indonesia Journal of Mathematical and Fundamental Sciences Jurnal Spektra ODONTO Dental Journal Padjadjaran Journal of Dentistry JPPPF (Jurnal Penelitian dan Pengembangan Pendidikan Fisika) Jurnal Penelitian Pendidikan IPA (JPPIPA) Spektra: Jurnal Fisika dan Aplikasinya Interdental Jurnal Kedokteran Gigi (IJKG) PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Indonesian Journal of Physics (IJP) Odonto dental journal Proceeding Seminar Nasional IPA Prosiding Seminar Nasional COSMIC Kedokteran

Fourier Dzar Eljabbar Latief

Department Of Physics, Faculty Of Mathematics And Fundamental Sciences, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung, 40132, Indonesia

Author-ID : 305082

Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Nursing Physics Public Health Other

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TORTUOSITAS PADA MODEL 3D BATUAN BERPORI Firmansyah, Firmansyah; Feranie, Selly; Latief, Fourier D.E; Tobing, Prana F. L.
Jurnal Spektra Vol 15, No 2 (2014): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

Show Abstract | Download Original | Original Source | Check in Google Scholar

Telah dilakukan perhitungan tortuositas dalam model 3D batuan berpori. Model 3D batuan berpori ini dibentuk oleh butiran bola yang didistribusikan secara acak, untuk melihat pengaruh distribusi tersebut terhadap nilai porositas (Ï)dan tortuositas (Ï). Perhitungan dibatasi pada model dengan porositas 10%, 15% dan 20% serta ukuran jari-jari butiran bola dalam rentang 5-10, 10-15, dan 15-20 (dalam ukuran pixel). Diperoleh hasil perhitungan untuk : 1) Porositas 10% dengan jari-jari butir seperti disebutkan sebelumnya, nilai tortuositas secara berurutan yaitu Ï = 2,127Â±0,846, Ï = 1,669Â±0,610 dan Ï = 1,732Â±0,371; 2) Porositas 15%, nilai tortuositas secara berurutan yaitu Ï = 1,542Â±0,266, Ï = 1,477Â±0,231 dan Ï =1,359Â±0,232; 3) Porositas 20%, nilai tortuositas secara berurutan yaitu Ï = 1,806Â±0,493, Ï = 1,708Â±0,502 dan Ï = 1,536Â±0,582. Terlihat bahwa untuk porositas yang sama dengan jari-jari butir yang berbeda akan menghasilkan nilai tortuositas yang berbeda. Hal tersebut bisa terjadi karena pengaruh distribusi acak butiran. Nilai tortuositas paling tinggi berdasarkan hasil diatas adalah Ï = 2,12 sedangkan menurut asumsi dalam persamaan Kozeny-Carman untuk menghitung permeabilitas bernilai Ï = 2,5 untuk semua nilai porositas. Sehingga nilai tortuositas yang dianggap konstan untuk semua nilai porositas perlu dipertimbangkan kembali penggunaannya jika dilihat dari hasil perhitungan tortuositas pada model 3D batuan berpori ini. Kata kunci: Jari-jari butiran, Tortuositas, Perumusan Kozeny-Carman, Model 3D batuan berpori

Rancang Bangun Alat Eksperimen Sederhana Gerak Proyektil Wijaya, Pradita Adnan; Fauzi, Umar; Latief, Fourier Dzar Eljabbar; Firdaus, M. Thoha
Jurnal Riset dan Kajian Pendidikan Fisika Vol 4, No 1 (2017): April 2017
Publisher : Universitas Ahmad Dahlan

Menentukan gerak proyektil merupakan permasalahan penting dalam sejarah perkembangan ilmu mekanika. Gerak proyektil adalah gerak suatu benda yang diberi kecepatan awal, kemudian menempuh lintasan yang arahnya sepenuhnya dipengaruhi oleh percepatan gravitasi dan hambatan udara. Untuk mempermudah pemahaman peserta didik mengenai materi gerak proyektil, telah dibuat suatu alat eksperimen gerak proyektil sederhana. Diharapkan alat ini dapat digunakan sebagai media pembelajaran yang mudah diaplikasikan, ditiru dan terjangkau bagi pihak sekolah maupun lembaga pendidikan.Â Determining projectile motion is an important issue in the history of the development of mechanics. The motion of a projectile is the motion of an object given the initial velocity, then travels the path whose direction is completely influenced by the acceleration of gravity and air resistance. To facilitate students understanding of projectile motion material, a simple projectile motion experiments tool has been developed. It is expected that this tool can be used as a learning media that is easy to apply, imitated and affordable for schools and educational institutions.

The Effect of Milk or its Combination with Tea and 0.2% NaF on Dental Enamel Demineralization Analyzed by Micro Computed Tomography Rahardjo, Anton; Sahertian, Raisa D.; Ramadhani, Siti A.; Maharani, Diah A.; Latief, Fourier DE.
Journal of Dentistry Indonesia Vol. 21, No. 2
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Fluoride and calcium play an important role in the prevention of dental caries, promoting the inhibition of demineralization and the increase of remineralization. Objective: To investigate the effects of milk with/without the combination of tea and 0.2% NaF on enamel demineralization using micro-computed tomography (microCT). Methods: The coronal parts of 40 extracted sound premolars were prepared as tooth blocks. An unvarnished occlusal surface window was created for each tooth by covering the occlusal surface with a 3x5 mm2 sticker and painting all other surfaces with an acid-resistant varnish. These blocks were randomly allocated into four groups that were immersed in remineralizing solutions for 26 minutes: Group A, milk; Group B, milk and tea; Group C, milk and 0.2% NaF; and Group D, deionized water (control). Results: After 3 days of immersion in a buffered demineralization solution at pH 4.4, micro-CT scans were taken. The mean grayscale values and the standard deviations are: 98.1 ± 24.0; 90.8 ± 9.1; 92.6 ± 21.4; 81.1 ± 20.3, respectively. The mean grayscale values were significantly different among the four groups (p

The Development of Experimental Sets for Measuring Linear Thermal Expansion Coefficient of Metal Using Digital Video-Based Single Slit Diffraction Method Yuri Yogaswara; Fourier Dzar Eljabbar Latief
Jurnal Penelitian & Pengembangan Pendidikan Fisika Vol 4 No 2 (2018): JPPPF (Jurnal Penelitian dan Pengembangan Pendidikan Fisika), Volume 4 Issue 2, D
Publisher : Program Studi Pendidikan Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

The development of an apparatus for the measurement of linear thermal expansion coefficient of metal by a single diffraction method has been developed. The development was made based on several ideas from previous researchers, as well as to overcome several limitations which yields insignificant results. The development includes the redesign of the primary holder module, the temperature measurement module (using a thermocouple sensor connected to the PC), and the measurement approach of the diffraction pattern distance by means of digital video analysis techniques using Tracker software. The development of the modules as well as the measurement approach that has been done yields very good experimental results. The measured linear thermal expansion coefficient of aluminum has a high level of accuracy and precision. The result is (23.100 ± 0.2186)×10-6/°C, and compared from a reference, i.e., 23.000 × 10-6/°C, the relative error of is 0.95% and the relative standard deviation is 0.43%.

Rancang Bangun Alat Eksperimen Sederhana Gerak Proyektil Pradita Adnan Wijaya; Umar Fauzi; Fourier Dzar Eljabbar Latief; M. Thoha Firdaus
Jurnal Riset dan Kajian Pendidikan Fisika Vol 4, No 1 (2017): April 2017
Publisher : Universitas Ahmad Dahlan

Menentukan gerak proyektil merupakan permasalahan penting dalam sejarah perkembangan ilmu mekanika. Gerak proyektil adalah gerak suatu benda yang diberi kecepatan awal, kemudian menempuh lintasan yang arahnya sepenuhnya dipengaruhi oleh percepatan gravitasi dan hambatan udara. Untuk mempermudah pemahaman peserta didik mengenai materi gerak proyektil, telah dibuat suatu alat eksperimen gerak proyektil sederhana. Diharapkan alat ini dapat digunakan sebagai media pembelajaran yang mudah diaplikasikan, ditiru dan terjangkau bagi pihak sekolah maupun lembaga pendidikan. Determining projectile motion is an important issue in the history of the development of mechanics. The motion of a projectile is the motion of an object given the initial velocity, then travels the path whose direction is completely influenced by the acceleration of gravity and air resistance. To facilitate students' understanding of projectile motion material, a simple projectile motion experiments tool has been developed. It is expected that this tool can be used as a learning media that is easy to apply, imitated and affordable for schools and educational institutions.

Multifractal Characterization of Pore Size Distributions of Peat Soil Joko Sampurno; Azrul Azwar; Fourier Dzar Eljabbar Latief; Wahyu Srigutomo
Journal of Mathematical and Fundamental Sciences Vol. 48 No. 2 (2016)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2016.48.2.2

This paper discusses a multifractal analysis of the microscopic structure of peat soil. The aim of this study was to apply the multifractal technique to analyze the properties of five slices of peat soil (L1-L5). Binary images (220 x 220 pixels, with a conversion value of 9.41 Î¼m/pixel) were made from the thin slices and then analyzed. This analysis was conducted to obtain the relationship between physical parameters and complexity parameters. The results showed that the spectrum of f(Î±) can describe well the pore size distribution and average size of pores correlated with the value of D(0). A high value of the average pore size is followed by a low D value and vice versa.

ANALISIS KOMPLEKSITAS STRUKTUR PORI PADA SAMPEL DIGITAL MEDIUM BERPORI Ulpa Zein Fawziah; Aceng Kurnia Rochmatulloh; Rizki Fahmi Sumaryono; Selly Feranie; Fourier Dzar Eljabbar Latief
Spektra: Jurnal Fisika dan Aplikasinya Vol 2 No 3 (2017): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 2 Nomor 3, Desember 2017
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Abstrak Kompleksitas struktur pori terhubung pada sampel digital medium berpori 2D telah dianalisis menggunakan parameter tortuositas. Jalur pori terhubung dilacak dengan menggunakan Simple Neurite Tracer. Metode pelacakan dan perhitungan tortuositas tersebut diujikan pada lima model sederhana yang menunjukan perbedaan tingkat kompleksitas yang signifikan. Metode analisis kompleksitas tersebut kemudian diterapkan pada sampel medium berpori berupa citra digital batuan berukuran 560 Ã— 393 piksel, dan tanah berukuran 560 Ã— 475 piksel. Citra digital sampel tanah dan batuan yang dianalisis berupa irisan 2D pada bidang z-y (sagittal) yang diambil dari sampel 3D hasil pemindaian menggunakan -CT Scanner SkyScan 1173. Pelacakan jalur pori terhubung pada sampel model maupun sampel digital 2D batuan dan tanah yang menggunakan Simple Neurite Tracer menghasilkan koordinat jalur pori terhubung yang kemudian digunakan untuk menghitung nilai tortuositas. Tortuositas dihitung dengan menggunakan definisi rasio antara jumlah total sudut keberlikuan jalur terhadap jarak antara dua sisi sampel yang saling berhadapan. Untuk 5 sampel model yang menunjukkan kompleksitas yang berbeda, diperoleh bahwa semakin kompleks struktur pori tersebut, maka semakin besar nilai tortuositasnya. Untuk analisis pada sampel digital batuan, nilai tortuositasnya yaitu 0,0392 sedangkan pada sampel tanah didapat nilai tortuositas sebesar 0,0431. Kata-kata kunci: simple neurite tracer, tortuositas, kompleksitas, medium berpori Abstract The complexity of the connected pore structure of 2D porous digital media samples has been analyzed using tortuosity parameter. Connected pore was traced using the Simple Neurite Tracer. The tracing method and the tortuosity calculation were tested on five simple models showing significant differences in complexity levels. The complexity analysis method was then applied on digital image of a rock sample with the size of 560 Ã— 393 pixels, and a soil sample with the size of 560 Ã— 475 pixels. Digital images of the rock and soil samples were analyzed on the 2D slices in the zy (sagittal) plane which were obtained from the scanned 3D samples using the Âµ-CT SkyScan 1173 Scanner. Connected pore tracing for both the 2D models as well as the rock and soil samples was done using the Simple Neurite Tracer which produce the coordinate of the connected pore path which is then used to calculate the value of tortuosity. Tortuosity is calculated by using the definition of the ratio between the sum of the curvaceous angles of the connected pore path to the distance between two facing sides of the sample. For 5 sample models with distinctive complexity, it was found that the more complex the pore structure, the greater the tortuosity value. For analysis on digital samples of rocks, the tortuosity is 0.0392 whereas in the soil sample, the tortuosity is 0.0431. Keywords: simple neurite tracer, tortuosity, complexity, porous medium.

ANALISIS CITRA DIGITAL UNTUK SAMPEL BATUAN MENGGUNAKAN MICRO-CT SCANNER SKYSCAN 1173 Aceng Kurnia Rochmatulloh; Ulpa Zein Fawziah; Rizki Fahmi Sumaryono; Selly Feranie; Fourier Dzar Eljabbar Latief
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 6 (2017): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2017
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Digital image analysis has been done on rock samples of scanning results using Bruker Skyscan 1173 Micro-CT Scanner. The analysis is done qualitatively and quantitatively to know the characteristics of the sample image of the rock. The digital samples of rock produced from the scanning process are 380 x 380 x 380 pixels in size. Qualitative analysis is done by using CTAn (2D) and CTVox (3D) software. Quantitative analysis is done by calculating pore size, open porosity, closed porosity, total porosity and fractal dimension using CTAn software. The consensus analysis of the use of Cartesian axes of digital data in the software used (CTAn, CTVox, DataViewer, ImageJ and Matlab) is done by examining 2D trans-axial imagery (XY), sagittal (field ZY), and coronal (XZ). The results of the rock parameters analyzed in the rock samples indicate that the rocks belong to the type of faneric/fine fanerokristalin, have a porosity that is special, the pores in the rock are well connected, and the fluid flow in the rock is quite complex. Rock samples obtained from various software show similarities of image on CTAn, CTVox, and DataViewer software, but unlike the image of ImageJ and Matlab so it is necessary to change the coordinate axis if in advanced processing using both devices. Keywords: digital image analysis, porosity, fractal dimension, porous media

Analysis of Image Fusion Effect in Image Quality of Kidney Stone Fadhila Ulfa Jhora; Freddy Haryanto; Leni Aziyus Fitri; Fourier Dzar Eljabbar Latief
Jurnal Penelitian Pendidikan IPA Vol 8 No 4 (2022): October
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v8i4.2208

Kidney stones are a disease due to the buildup of substances that are not needed in the urinary system. Knowledge of the composition and type of stone is required in the treatment of action. Micro CT is one of the modalities that can be used in determining the composition of kidney stones. However, there are limitations when using single-energy micro-CT. Stone attenuation has almost the same value when using single energy, therefore it is necessary to use dual-energy CT to determine the difference in stone attenuation more precisely. The image of the dual-energy CT micro-energy stone needs to be processed before analyzing and determining the rock composition. Image fusion is one of the image processing techniques that can be used. The purpose of this study was to determine the effect of image fusion on the image quality of five kidney stones. The stages in the research carried out are collecting high energy and low energy projection image data, and performing image fusion on the two projected image data. The results obtained are first, the dual-energy CT image fusion affects the image quality which can be seen from the increase in the signal to noise ratio (SNR) value. A high SNR value provides the best image quality information

Performance Analysis of 2D and 3D Fluid Flow Modelling Using Lattice Boltzmann Method Fourier Dzar Eljabbar Latief; Umar Fauzi
Indonesian Journal of Physics Vol 18 No 2 (2007): Vol. 18 No. 2 April 2007
Publisher : Institut Teknologi Bandung

Several studies have been conducted to observe properties of fluid flow in materials using the Lattice Boltzman Method (LBM). There are two widely used lattice model, the D2Q9 for the 2D simulation, and the D3Q19 for the 3D simulation. Our particular interest is to study the velocity map both using the 2D and the 3D simulation, using the same object. The aim of this study is to evaluate effectiveness and efficiency of both methods. In our simulation, the velocity profile between the 2D and 3D models differs greatly (mean error 30.4%) if the object has complex lateral structure (the shape along the z-axes differs greatly), while for the less complex object, the profile has only 1.4% of mean error. The computing time for the 3D model took 13 times longer than the simulation of the 2D model. The result from the comparison of both methods concludes that the simplification of fluid flow simulation of 3D objects into 2D objects should be taken carefully, for in some cases, the simplification is not quite appropriate.

Co-Authors Aceng Kurnia Rochmatulloh Aceng Kurnia Rochmatulloh Alexander Patera Nugraha Amida, Aya Anton Rahardjo Ardani, I Gusti Wahju Ayu Trisna Hayati Azrul Azwar Bahraini, Fahrisah Nurfadeliah Cahyanto, Arief Dudi Aripin Fadhila Ulfa Jhora Fahrisah Nurfadeliah Bahraini Fauzi, Umar Firmansyah Firmansyah Freddy Haryanto I Gusti Aju Wahju Ardani Ida Bagus Narmada Joko Sampurno Kosterman Usri Kuntaman Kuntaman Leni Aziyus Fitri Maharani, Diah A. Marry Siti Mariam Nina Djustiana Pradita Adnan Wijaya Prana F. L. Tobing, Prana F. L. Putra, Ramadhan Hardani Ramadhani, Siti A. Regita Cahyani, Nafansya Rizki Fahmi Sumaryono Rizki Fahmi Sumaryono Sahertian, Raisa D. Selly Feranie Sri Tjahajawati Sunardhi Widyaputra Thoha Firdaus Ulpa Zein Fawziah Ulpa Zein Fawziah Umar Fauzi Umar Fauzi Wahyu Srigutomo Wahyuni Dyah Parmasari, Wahyuni Dyah Widiastuti, Yanti Wijaya, Pradita Adnan Yuri Yogaswara Yuri Yogaswara

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