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All Journal International Journal of Renewable Energy Development Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Neutrino Journal of Engineering and Technological Sciences Jurnal Fisika FLUX
Abdullah Nur Aziz
Universitas Jenderal Soedirman
Astronomy Chemistry Earth & Planetary Sciences Education Energy Engineering Materials Science & Nanotechnology Physics

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Structured Mathematical Modeling of Industrial Boiler Aziz, Abdullah Nur; Nazaruddin, Yul Yunazwin; Siregar, Parsaulian; Bindar, Yazid
Journal of Engineering and Technological Sciences Vol 46, No 1 (2014)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (728.325 KB) | DOI: 10.5614/j.eng.technol.sci.2014.46.1.7

Abstract

As a major utility system in industry, boilers consume a large portion of the total energy and costs. Significant reduction of boiler cost operation can be gained through improvements in efficiency. In accomplishing such a goal, an adequate dynamic model that comprehensively reflects boiler characteristics is required. This paper outlines the idea of developing a mathematical model of a water-tube industrial boiler based on first principles guided by the bond graph method in its derivation. The model describes the temperature dynamics of the boiler subsystems such as economizer, steam drum, desuperheater, and superheater. The mathematical model was examined using industrial boiler performance test data.It can be used to build a boiler simulator or help operators run a boiler effectively.
Studi Analisis Sifat Dielektrik Tanah dengan Variasi Porositas Pada Frekuensi Resonansi Rendah Sehah, Sehah; Aziz, Abdullah Nur
Jurnal Fisika FLUX Vol 6, No 2 (2009): Jurnal Fisika Flux Edisi Agustus 2009
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v6i2.3054

Abstract

The equipment to measure dielectric properties of soil samples withlissajous method has been designed in Electronic and InstrumentationsLaboratory, Faculty of Science and Technique, Jenderal Soedirman University,Purwokerto. The fundamental parts of this equipment are signal generator,cathode ray oscilloscope (CRO) and parallel plate. Thus, the soil samples whichbe researched is placed in zone between parallel plate, as dielectric material. Ifsignal generator supply electric field into the parallel plate, hence response ofsamples to electric field is shown with voltages values on oscilloscope (CRO).Based on this voltages values, so that can be calculated a dielectric permittivity,dielectric loss and tangent loss of soil samples. The number of samples thatmeasured its dielectric properties are three samples, which contains of top soil,smooth sand of river, and sediments rocks. The measurement to dielectricproperties with variation of porosity is done to samples at low resonancefrequency of 600 kHz and 2,75 MHz. The results which obtained show that alinear relation between dielectric constant of soil samples to its porosity, but withempirical equations different for every samples.
PENDUGAAN KEDALAMAN AIR TANAH MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DI DESA BOJONGSARI, KECAMATAN ALIAN, KABUPATEN KEBUMEN Sehah, Sehah; Aziz, Abdullah Nur
Jurnal Neutrino Vol 8, No 2. APRIL (2016): JURNAL NEUTRINO
Publisher : Department of Physics, Maulana Malik Ibrahim State Islamic University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (381.79 KB) | DOI: 10.18860/neu.v8i2.3239

Abstract

Pendugaan kedalaman air tanah di Desa Bojongsari, Kecamatan Alian, Kabupaten Kebumen menggunakan metode Geolistrik konfigurasi Schlumberger telah dilaksanakan pada tanggal 9 Oktober 2015. Pengukuran geolistrik dilaksanakan dengan cara menginjeksikan arus listrik ke dalam bumi dan mengukur beda potensial yang terjadi di tiga titik lokasi yaitu Bojongsari 01, Bojongsari 02, dan Bojongsari 03. Pengolahan data dan pemodelan dilakukan hingga diperoleh data resistivitas yang merepresentasikan jenis-jenis lapisan batuan bawah permukaan di daerah penelitian. Pada titik Bojongsari 01 lapisan akuiferair tanah dangkal diperkirakan tersusun atas pasir berbutir halus (0,85 Wm) dengan kedalaman 7,35–10,78 m dan lempung pasiran (13,25 Wm) dengan kedalaman 10,78–29,44 m, sedangkan lapisanakuifer dalam tersusun atas pasir berbutir halus (0,44 Wm) pada kedalaman 33,72 – 85,76 m. Pada titik Bojongsari 02 lapisan akuifer dangkal diperkirakan tersusun atas lempung pasiran (19,43 Wm) pada kedalaman 7,61–26,65 m dan pasir lempungan (3,18 Wm) pada kedalaman 26,65–43,32 m, sedangkan lapisan akuifer dalam tersusun atas pasir lempungan (5,97 Wm) pada kedalaman 53,94 m. Pada titik Bojongsari 03 lapisan akuifer dangkal diperkirakan tersusun atas pasir berbutir halus (1,18 Wm) dengan kedalaman 11,28–38,25 m, sedangkan lapisan akuifer dalam tersusun atas lempungpasiran berbutir kasar (28,02 Wm) dengan kedalaman 77,25 m. Berdasarkan hasil pemodelan di atas, lapisan akuifer yang diperkirakan paling cocok dimanfaatkan untuk proyek pengadaan air bersih di Desa Bojongsari, Kecamatan Alian, Kabupaten Kebumen adalah lapisan akuiferair tanah dalam untuk titik Bojongsari 01.
Numerical Analysis of Energy Converter for Wave Energy Power Generation-Pendulum System Aminuddin, Jamrud; Effendi, Mukhtar; Nurhayati, Nurhayati; Widiyani, Agustina; Razi, Pakhrur; Wihantoro, Wihantoro; Aziz, Abdullah Nur; Abdullatif, R Farzand; Sunardi, Sunardi; Bilalodin, Bilalodin; Arifin, A
International Journal of Renewable Energy Development Vol 9, No 2 (2020): July 2020
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.9.2.255-261

Abstract

The wave energy power generation-pendulum system (WEPG-PS) is a four-wheeled instrument designed to convert wave power into electric energy. The first wheel is connected to the pendulum by a double freewheel, the second and third are ordinary wheels, while the fourth is a converter component that is axially connected to the electric generator. This design used the Euler-Lagrange formalism and Runge-Kutta method to examine an ideal dimension and determine the numerical solution of the equation of motion related to the rotation speed of the wheels. The result showed that the WEPG-PS' converter system rotated properly when its mass, length, and moment of inertia are 10 kg, 2.0 m, and 0.25 kgm2, respectively. This is in addition to when the radius of the first, second, third, and fourth wheels are 0.5, 0.4, 0.2, and 0.01 m, with inertia values of 0.005, 0.004, 0.003, and 0.1 kgm2. The converter system has the ability to rotate the fourth wheel, which acts as the handle of an electric generator at an angular frequency of approximately 500 - 600 rad/s. The converter system is optimally rotated when driven by a minimum force of 5 N and maximum friction of 0.05. Therefore, the system is used to generate electricity at an amplitude of 0.3 - 0.61 m, 220 V with 50 Hz. Besides, the lower rotation speed and frequency of the energy converter of the WEPG-PS (300 rad/s) and induction generator (50 Hz) were able to generate electric power of 7.5 kW. 
Coastal Hydrogeological Model in the Iron Ore Prospect Area of Widarapayung Coastal, Cilacap Regency Based on 2D-Resistivity Data Sehah, Sehah; Raharjo, Sukmaji Anom; Aziz, Abdullah Nur
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 8, No 2 (2018)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v8n2.p71-83

Abstract

The coastal hydrogeological model of iron ore prospect area in Widarapayung coastal, Cilacap Regency, has been designed and performed based on the 2D-resistivity data. The background of this research is potentiality of iron sand in this area and its prospect to be mined. Mining activities in large-scale may lead into surface decreasing, triggering damage to the aquifer, abrasion, and saltwater intrusion in the coastal area. The acquisition of 2D-resistivity data has been performed on five trajectories including of WP-01 up to WP-05. Based on the modeling results, it can be concluded that the sub-surface rocks resistivity profile consists of WP-01 with the values of 1.93-114.00 Ωm; WP-02 with the values of 3.67-121.00 Ωm; WP-03 with the values of 3.86-78.40 Ωm; WP-04 with the values of 1.79-100.00 Ωm; and WP-05 with the values of 2.61-86.20 Ωm. After interpretation, it is found that the hydrogeological profile of sub-surface rocks consists of sand inserted with gravels (topsoil); sand containing iron ore granules inserted with silt (topsoil and shallow aquifer); clayey sand (semi-aquifer layer); sandy clay (semi-impermeable layer); and sand (deep aquifer which is intruded by salt water). Based on the analysis, the sand containing iron ore is part of the shallow aquifer, so the mining activities of iron sand is potential to damage and reduce aquifer function in storing and flowing the groundwater in the research area.
Co-Authors - Sehah, - Aminuddin, Jamrud Arifin, A Bilalodin Bilalodin Farzand Abdullatif Mukhtar Effendi Nurhayati Nurhayati Pakhrur Razi Parsaulian Siregar Sehah Sehah Sukmaji Anom Raharjo Sunardi Sunardi Widiyani, Agustina Wihantoro Wihantoro Yazid Bindar Yul Yunazwin Nazaruddin