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Journal of Engineering and Technological Sciences
Published by Institut Teknologi Bandung
ISSN : 23375779     EISSN : 23385502     DOI : -
Core Subject : Engineering,
Engineering
Journal of Engineering and Technological Sciences welcomes full research articles in the area of Engineering Sciences from the following subject areas: Aerospace Engineering, Biotechnology, Chemical Engineering, Civil Engineering, Electrical Engineering, Engineering Physics, Environmental Engineering, Industrial Engineering, Information Engineering, Mechanical Engineering, Material Science and Engineering, Manufacturing Processes, Microelectronics, Mining Engineering, Petroleum Engineering, and other application of physical, biological, chemical and mathematical sciences in engineering. Authors are invited to submit articles that have not been published previously and are not under consideration elsewhere. Starting from Vol. 35, No. 1, 2003, full articles published are available online at http://journal.itb.ac.id, and indexed by Scopus, Index Copernicus, Google Scholar, DOAJ, GetCITED, NewJour, Open J-Gate, The Elektronische Zeitschriftenbibliothek EZB by University Library of Regensburg, EBSCO Open Science Directory, Ei Compendex, Chemical Abstract Service (CAS) and Zurich Open Repository and Archive Journal Database. Publication History Formerly known as: ITB Journal of Engineering Science (2007 – 2012) Proceedings ITB on Engineering Science (2003 - 2007) Proceedings ITB (1961 - 2002)
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Articles 6 Documents
 1 
Search results for , issue "Vol. 43 No. 2 (2011)" : 6 Documents clear
Combination of Minimum-Maximum (m-m) Attribute and Zero-INTENS-Difference (z-i-d) Attribute for Estimating Seismically Thin-Bed Thickness Eko Widi Purnomo; Zuhar Zahir Tuan Harith
Journal of Engineering and Technological Sciences Vol. 43 No. 2 (2011)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2011.43.2.1

Abstract

This  paper  demonstrates  a  new  alternative  way  in  estimating seismically thin-bed (below-tuning) thickness. Initial thickness is built by bandpass filtering the amplitude display of a zero-phase seismic. The filter removes the  non  minimum  and  or  non  maximum  and  left  the  maximum  and  or  the minimum of seismic amplitude. The unresolved below-tuning thickness is then corrected  by  zero-INTENS-difference  (z-i-d)  attribute.  INTENS  is  integrated energy  spectra,  an  attribute  which  can  be  derived  from  spectral  analysis.  z-i-d attribute is zero difference of INTENS between the seismic and its synthetic. The method  generates  INTENS  difference  profile  by  subtracting  seismic  INTENS and its synthetic INTENS iteratively. The iteration is controlled by dipole space shifting from  distance to closer or  vice  versa.  The true thickness is derived  by locating z-i-d which laid in INTENS different profile. It has found that, for free noise  true  seismic  and  perfect-wavelet  (a  wavelet  which  only  approximately similar  with  wavelet  which  constructing  the  true  seismic)  synthetic  seismic,  in INTENS  different  profile,  the  z-i-d  location  always  corresponds  to  true  dipole space or thickness. The method could resolve all thickness of a wedge-modeled seismic with three different dominant frequencies. When the synthetic seismic is constructed with imperfect wavelet, slightly different analysis is needed to locate z-i-d  attribute  and  the  result  is  not  as  perfect  as  when  perfect  wavelet constructing synthetic seismic. A quiet similar result is got when the method is implemented  for  noisy  wedge-modeled  seismic.  Bad  thickness  estimation  is resulted  for  20%  noise  seismic.  The  method  algorithm  is  extended  for  similar dipole polarity model and multilayer model to bring the method to real seismic data  nearer.  The  extension  is  done  by  estimating  thickness  of  every  layer  of  a stacked-wedge-modeled  seismic. The algorithm then generalized for estimating layers  thickness  with  several  thickness  combinations.  The  method  was  able  to delineate shallow channel of Stratton Field by providing good pseudo-acousticimpedance (pseudo AI) map.
Autonomous Coastal Land Cover Assessment Using Polarimetric Decomposition of SAR Data Bambang H. Trisasongko
Journal of Engineering and Technological Sciences Vol. 43 No. 2 (2011)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2011.43.2.2

Abstract

The  paper  reports  an  experiment  on  classification  using  fully polarimetric SAR data.  Many  reports have been presented mentioning test sites in  temperate  regions  utilizing  polarimetric  SAR  data  from  airborne  and/or spaceborne SAR sensors. However, few  studies are dedicated  to  tropical region which highly dynamic land uses are  observed.  Using the AirSAR Sungai Wain fully polarimetric data, capability to extract features in coastal region has been demonstrated  by  an  unsupervised  classification  technique  fed  by  the  CloudePottier decomposition theorem.
Synthesis of -Al2O3 Catalyst Support from Kaolin of Indonesian Origin Tjokorde Walmiki Samadhi; Subagjo Subagjo; Kevin R. Lismana; Khasin Fuadi
Journal of Engineering and Technological Sciences Vol. 43 No. 2 (2011)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2011.43.2.3

Abstract

Kaolin  has  been  identified  as  a  potential  raw  material  for  the production of  -Al2O3  for  hydrotreating  catalyst support. This work explores the technical  feasibility  of  applying  the  potassium  hydroxide  (KOH)  e xtraction synthesis route on kaolin  from the Belitung  Island  in Indonesia. The application of  a  published  synthesis  method  to  Belitung  kaolin  requires  an  approximately twofold  increase  in  kaolin  calcination  time,  an  increase  in  kaolin  calcination temperature from 950 to 1000 °C, and a tenfold increase in metakaolin extraction time, to obtain a specific surface area higher than 200 m2/g. The highest specific surface area of 233 m2/g was obtained when  the kaolin was calcined at 1000 °C for 24 hours, and the  metakaolin  was extracted by concentrated KOH  solution for 12 hours.  Phase characterization of the final product confirmed the formation of -Al2O3, but with the inclusion of low-surface area -Al2O3 phase.
An LMI Approach to H∞ Performance Analysis of Continuous-Time Systems with Two Additive TimeVarying Delays Wrastawa Ridwan; Bambang Riyanto Trilaksono
Journal of Engineering and Technological Sciences Vol. 43 No. 2 (2011)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2011.43.2.4

Abstract

This paper investigates the problem of H∞ performance analysis for continous–time systems with two additive time -varying delays in the state. Our objective is focused on stability analysis of a continuous system with two timevarying delays with an H∞ disturbance attenuation level γ. By exploiting Lyapunov-Krasovski functional and introducing free weighting matrix variables, LMI stability condition have been derived.
A New Voltage Control Method for Single-Phase PWM Inverters Pekik Argo Dahono; Een Taryana
Journal of Engineering and Technological Sciences Vol. 43 No. 2 (2011)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2011.43.2.5

Abstract

A  new  voltage  control  method  for  single-phase  full-bridge PWM inverters  that having an output LC filter  is proposed in this paper. The proposed voltage  controller has a capability to realize a zero steadystate output voltage error with fast response. The zero steady-state output voltage error is achieved by using a controller that is derived by using the virtual LC resonant circuit. Fast response is obtained by using a virtual resistance  that  is  connected  in  parallel  with  the  filter  capacitor.  The validity of the proposed method is verified by experimental results.
Sorption and Degradation Capacity of Natural Estrogens in Freshwater Environmental System in Japan Reni Desmiarti; Fu-Sheng Li
Journal of Engineering and Technological Sciences Vol. 43 No. 2 (2011)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2011.43.2.6

Abstract

The  sorption  and  the  degradation  capacity  of  natural  estrogens  in freshwater  environmental  system  in  Japan  were  performed.  Batch  experiments were examined in water-sediment suspensions using six layers of sediment under aerobic and anaerobic conditions. The results indicated that the water-sediment partition coefficient of E1 (KdE1) was higher than E2 (KdE2). The degradation rate of E1 (kE1) was smaller than E2 (kE2). Under aerobic and anaerobic conditions, E1  was  formed  from  E2.  The  degradation  rate  of  E2  (kE2)  from  the  surface  to bottom of sediment layers was estimated fell in the range from 0.114 to 0.026 h-1 and 0.05 to 0.014 h-1  under aerobic and anaerobic conditions, respectively. 

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