Journal of Engineering and Technological Sciences
ISSN : 23375779     EISSN : 23385502
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)
Articles 422 Documents
Development of Instant Microbial Starter for Production of Fermented Cassava Flour: Effect of Vacuum Drying Temperature, Carrier Media, and Storage Temperature

Kresnowati, Made Tri Ari Penia ( Department of Chemical Engineering, Faculty of Industrial Technology, Insitut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132, ) , Bindar, Yazid ( Department of Food Engineering, Faculty of Industrial Technology, Insitut Teknologi Bandung, Jalan Raya Jatinangor, Sumedang 45363, ) , Rahmina, Fathya ( Department of Chemical Engineering, Faculty of Industrial Technology, Insitut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132, )

Journal of Engineering and Technological Sciences Vol 50, No 6 (2018)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Original Source | Check in Google Scholar | Full PDF (141.447 KB) | DOI: 10.5614/j.eng.technol.sci.2018.50.6.6

Abstract

Cassava is an important crop for tropical countries such as Nigeria, Brazil, Thailand, and Indonesia. The potential utilization of cassava in the food industry can be enhanced by processing cassava into fermented cassava flour (fercaf), which has been shown to have a neutral color and aroma as well as low cyanogenic content. The use of specific microbial starter in the cassava chip fermentation for fercaf production will direct the fermentation process, maintaining a high quality of the produced flour. Thereby, the availability of an easy-to-use microbial starter is important for the production of fermented cassava flour. The aim of this study was to evaluate vacuum drying methods in the preparation of microbial starter for fermented cassava flour production. In particular, the effects of carrier media, drying and storage temperature on cell viability in dry starter were tested. The results showed that different methods should be applied to different microbial species. Bacillus subtilis and Aspergillus Oryza should be prepared using fercaf as the carrier media at a drying temperature of 55 °C, whereas Lactobacillus plantarum starter should be prepared using skim milk as the carrier media at a drying temperatur of 40°C. Apart from B. subtilis, the starters should be stored in a refrigerator.

Effects of Grinding Process on the Properties of the Coal Bottom Ash and Cement Paste

Mangi, Sajjad Ali ( Department of Civil Engineering, Mehran University of Engineering & Technology, SZAB Campus, Khairpur Mirs, Sindh, ) , Wan Ibrahim, Mohd Haziman ( Jamilus Research Center, Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Johor, ) , Jamaluddin, Norwati ( Jamilus Research Center, Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Johor, ) , Arshad, Mohd Fadzil ( Faculty of Civil Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, ) , Memon, Sheeraz Ahmed ( Institute of Environmental Engineering & Management, Mehran University of Engineering & Technology, Jamshoro, Sindh, ) , Shahidan, Shahiron ( Faculty of Civil Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, )

Journal of Engineering and Technological Sciences Vol 51, No 1 (2019)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Original Source | Check in Google Scholar | Full PDF (795.186 KB) | DOI: 10.5614/j.eng.technol.sci.2019.51.1.1

Abstract

The grinding process is necessary to convert original coal bottom ash (CBA) into a powder form. The aim of this study is to evaluate the grinding process effects on physical properties of CBA, it influences on consistency and setting time of cement paste and to predict it potentiality based on chemical characteristics to reduce the alkali-silica reaction (ASR) in concrete. The CBA is the by-product of coal based thermal power plant. Due to high production of electricity in Malaysia, the excess amount of CBA has been produced annually and it causes the environmental problems. Therefore, it is necessary to come up with advanced solutions for that pollution. This study considered the different grinding periods i.e. 2, 10, 20, and 40hrs as to produce different particle fineness. It was perceived through the laboratory findings that the more the grinding period, finer the particle sizes. Besides that, cement paste with 10, 20 and 30% of ground CBA as a substitute of ordinary portland cement (OPC) by weight was prepared, it was observed that the consistency of OPC paste increases with the addition of ground CBA. Moreover, initial and final setting time of cement paste containing ground CBA was observed higher than the OPC paste. Hence, based on experimental analysis and energy efficiency scenario, grinding period of 20hrs with specific surface area 3835.75 cm2/g is suggested for the future studies.

A Strategy for Sustainable Development: Using Nanotechnology for Solar Energy in Buildings (Case Study Parand Town)

Mahdi Nejad, Jamal-e-Din ( Faculty of Architecture and Urban Engineering, Shahid Rajaee Teacher Training University, Tehran, ) , Asadpour, Faezeh ( Faculty of Architecture and Urban Engineering, Shahid Rajaee Teacher Training University, Tehran, )

Journal of Engineering and Technological Sciences Vol 51, No 1 (2019)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Original Source | Check in Google Scholar | Full PDF (353.037 KB) | DOI: 10.5614/j.eng.technol.sci.2019.51.1.7

Abstract

Solar energy is a source of free and clean energy that has no harmful environmental effects. Simple applications of new technologies such as nanotechnology are a cost-effective way of using renewable energy, which has led many industries to invest in this area. In this descriptive-analytical study the utilization of solar energy in a hot and dry region of Iran was investigated as a useful and safe resource for supplying the energy needed for the construction of Parand town, considering the available climatic potentials. The statistical population in this study was a group of inhabitants of Parand town, employees of the Tehran Construction Engineering Organization and experts in the field, from which 384 participants were selected by simple random sampling. After collecting field information through a questionnaire, the relationships between the variables of the study were tested by SPSS. The result of the study showed that the most important achievements of using nanotechnology for solar energy in view of the sustainable development of building construction from the participants’ perspective were photovoltaic coating on building roofs (58.7% of the participants’ responses), nano solar water heaters (57.4% of responses) and active solar cell dryers (22.1% of responses) respectively.

Evaluation of Metro Kapsul Performance in Steady State Curving, Traction, and Braking

Budiwantoro, Bagus ( Mechanical Engineering Department, Faculty of Mechanical and Aerospace Engineering, Institut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132, National Center for Sustainable Transprotation Technology ) , Herman, Indria ( Mechanical Engineering Department, Faculty of Mechanical and Aerospace Engineering, Institut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132, ) , Halim, Fernando Sanjaya Sulaiman ( Mechanical Engineering Department, Faculty of Mechanical and Aerospace Engineering, Institut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132, )

Journal of Engineering and Technological Sciences Vol 50, No 6 (2018)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Original Source | Check in Google Scholar | Full PDF (1011.917 KB) | DOI: 10.5614/j.eng.technol.sci.2018.50.6.4

Abstract

Transportation is an important life aspect to save travel time from one place to another. However, traffic congestion is a major problem. Therefore, PT TReKKa intends to develop Metro Kapsul, a mass public transportation system that is suitable for densely populated developed cities. A series of technical analyses and evaluations is necessary to ensure vehicle safety in steady-state curving, traction, and braking. The maximum velocity and acceleration/deceleration in these conditions can be used to decide the development and manufacturing process of Metro Kapsul. The analyses consisted of theoretical and numerical simulations. The theoretical analysis involved applying force equilibrium condition of a rigid body. The simulation was modeled according to a real model of Metro Kapsul. The results showed that both values could be categorized as comfortable based on ASCE 21.2-2008. From this study, the safe longitudinal acceleration and deceleration of Metro Kapsul were obtained, i.e. 0.90 m/s2 and 0.97 m/s2, respectively, while the emergency longitudinal deceleration is 1.25 m/s2. When cornering, the maximum velocity is limited by the centrifugal acceleration, which is 0.6 m/s2. To conclude, the current design of Metro Kapsul is already good in steady-state performance. Further research is required for full dynamic and transient conditions with track irregularities.

Modeling and Experimental Investigation of Laminar Ceiling Air Distribution System for Operating Room in Merjan Teaching Hospital

Abed, Isam A. ( Department of Mechanical Engineering, College of Engineering, University of Babylon, Babylon ) , Hamza, Ruqaia A. ( Air Conditioning and Refrigeration Techniques Engineering Department, Al-Mustaqbal University College, Babylon )

Journal of Engineering and Technological Sciences Vol 50, No 6 (2018)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Original Source | Check in Google Scholar | Full PDF (953.198 KB) | DOI: 10.5614/j.eng.technol.sci.2018.50.6.9

Abstract

Room air distribution in operating rooms is critical to successful surgical treatment. The present study investigated the effects of the location of the air supply and exhaust grills on the air movement and air parameters inside an operating room. This paper presents an experimental and numerical analysis of air distribution in the operating room. The experimental work was conducted in an operating room in Merjan Teaching Hospital in the city of Babylon. Air was supplied from one square plenum box located in the middle of the ceiling, while air was exhausted through eight grills: large exhaust grills in the four upper corners and small exhaust grills in the four lower corners. In the theoretical work, a model of the operating room was developed and two cases were analyzed using the FLUEN 6.3.26 software program. The first case included all eight exhaust grills, while the second case included only the four lower exhaust grills. The ceiling system gave good ventilation for air distribution inside the operating room. There was no clear effect of the small exhaust grills located in the upper corners of the operating room. The height of the ceiling room is an effective factor in air distribution.

Study on the Extent of the Impact of Data Set Type on the Performance of ANFIS for Controlling the Speed of DC Motor

Yanling, Guo ( College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin, 150040, ) , Ahmed Mohamed, Mohamed Elhaj ( College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin, 150040, )

Journal of Engineering and Technological Sciences Vol 51, No 1 (2019)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Original Source | Check in Google Scholar | Full PDF (700.955 KB) | DOI: 10.5614/j.eng.technol.sci.2019.51.1.6

Abstract

This paper introduces an adaptive neuro-fuzzy inference system (ANFIS) for tracking SEDC motor speed in order to optimize the parameters of the transient speed response by finding out the perfect training data provider for the ANFIS. The controller was adjusted using PI, PD and PIPD to generate data sets to configure the ANFIS rules. The performance of the ANFIS controllers using these the different data sets was investigated. The efficiencies of the three controllers were compared to each other, where the PI, PD, and PIPD configurations were replaced by ANFIS to enhance the dynamic action of the controller. The performance of the proposed configurations was tested under different operating situations. Matlab’s Simulink toolbox was used to implement the designed controllers. The resultant responses proved that the ANFIS based on the PIPD dataset performed better than the ANFIS based on the PI and PD data sets. Moreover, the suggested controller showed a rapid dynamic response and delivered better performance under various operating conditions.

Hollow Core Slabs on Winkler Foundation

Al-Azzawi, Adel A. ( Department of Civil Engineering, Al-Nahrain University, Ministry of Higher Education and Scientific Research, Al-Jadriya 10070, Baghdad, )

Journal of Engineering and Technological Sciences Vol 50, No 6 (2018)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Original Source | Check in Google Scholar | Full PDF (990.597 KB) | DOI: 10.5614/j.eng.technol.sci.2018.50.6.3

Abstract

This research dealt with the linear elastic behavior of hollow core slabs resting on a linear Winkler type foundation. A finite difference method was used to model the slabs as wide beams and the foundation as elastic springs. The finite element method was also used to model the problem using ABAQUS 6.10 software program. A comparison between the method proposed in this paper and methods from previous studies was made to check the accuracy of the solutions. Several important parameters were incorporated in the analysis, viz. the hollow core size and shape, subgrade reaction and slab depth, to trace their effects on deflections, bending moments and shear forces. A computer program coded in Fortran was developed for the analysis of hollow core slabs on an elastic foundation. It was found that the maximum difference in deflection between the present study and the exact solution was 3% for the finite difference and 7% for the finite element method.

Development and Performance Evaluation of Coir Pith Ash as Supplementary Cementitious Material in Concrete

Venugopal, Balagopal ( Department of Structural and Geo-technical Engineering, School of Civil Engineering, Vellore Institute of Technology, Vellore-632 014, Tamilnadu, ) , Sambamurthy, Viswanathan ( Department of Structural and Geo-technical Engineering, School of Civil Engineering, Vellore Institute of Technology, Vellore-632 014, Tamilnadu, )

Journal of Engineering and Technological Sciences Vol 50, No 6 (2018)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Original Source | Check in Google Scholar | Full PDF (98.223 KB) | DOI: 10.5614/j.eng.technol.sci.2018.50.6.8

Abstract

India is the third largest producer of coconuts in the world after Indonesia and Brazil. The production of coconuts generates enormous volumes of by-products, which are dumped in landfills, causing issues like soil and air contamination, pollution of groundwater and other water bodies, with hazardous impacts on plant and animal life. Coir pith and short fibers are by-products from the coir industry obtained during the extraction of long fibers and account for approximately 70% of the mature coconut husk. Coir pith ash (CPA) was prepared by heating the dried coir pith in a metallic vessel at a temperature of 400 °C for 4 hours. The current paper shows an elaborate technical study on the material properties and performance of CPA in blended cements. The properties of concrete investigated were setting time, workability, compressive strength, splitting tensile strength, flexural strength and ultrasonic pulse velocity values. The specimens were tested at curing ages of 7, 28, 56 and 90 days. The test results indicated that CPA has moderate pozzolanic properties, with 10% as optimum replacement percentage.

Comparative Study of Bacterial Cellulose Film Dried Using Microwave and Air Convection Heating

Indriyati, I. ( Research Unit for Clean Technology, Indonesian Institute of Sciences, Jalan Sangkuriang Komplek LIPI Gedung 50, Bandung, Indonesia 2Research Center for Physics, Indonesian Institute of Sciences, Kawasan Puspiptek Serpong, Tangerang Selatan, ) , Irmawati, Yuyun ( Research Center for Physics, Indonesian Institute of Sciences, Kawasan Puspiptek Serpong, Tangerang Selatan, ) , Puspitasari, Tita ( Center for Application of Isotope and Radiation, National Nuclear Agency of Indonesia, Jalan Lebak Bulus Raya No. 49, Jakarta )

Journal of Engineering and Technological Sciences Vol 51, No 1 (2019)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Original Source | Check in Google Scholar | Full PDF (241.249 KB) | DOI: 10.5614/j.eng.technol.sci.2019.51.1.8

Abstract

An investigation was conducted to analyze and compare the properties of bacterial cellulose (BC) films dried using microwave and air convection heating. Prior to the drying process, 90% of the water content inside the BC pellicles was removed through vacuum filtration. After that, the required drying time was only 3-5 min using microwave heating, 95% shorter than that observed for air convection heating. The properties of the BC sheets were characterized by Fourier transform infrared (FTIR), X-ray diffractometer (XRD), color difference meter, and tensile tester machine. The results showed that the structure of the BC films was the same for the BC films dried by microwave and air convection heating, i.e. cellulose I, as observed from FTIR spectra and XRD diagrams. Moreover, their color (L*, a*, and b* values) and mechanical properties were also almost identical. However, a slightly lower crystallinity and a higher swelling degree were observed for the BC film dried using microwave heating. These results suggest that microwave heating could be an alternative method of drying BC pellicles in order to shorten the processing time and reduce energy consumption when compared to air convection heating.

Miscibility Development Computation in Enhanced Oil Recovery by Flare Gas Flooding

Samadhi, Tjokorde Walmiki ( Chemical Engineering Program at Institut Teknologi Bandung, Jalan Ganesha 10 Bandung, Jawa Barat 40132, Indonesia ) , Siagian, Utjok W.R. ( Petroleum Engineering Program at InstitutTeknologi Bandung, Jalan Ganesha 10 Bandung, Jawa Barat 40132, Indonesia ) , Budiono, Angga P. ( Chemical Engineering Program at Institut Teknologi Bandung, Jalan Ganesha 10 Bandung, Jawa Barat 40132, Indonesia )

Journal of Engineering and Technological Sciences Vol 44, No 3 (2012)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Original Source | Check in Google Scholar | Full PDF (251.227 KB) | DOI: 10.5614/itbj.eng.sci.2012.44.3.5

Abstract

The use of flare gas as injection gas in miscible gas flooding enhanced oil  recovery  (MGF-EOR)  presents  a  potential  synergy  between  oil  production improvement  and  greenhouse  gases  emission  mitigation.  This  work  is  a preliminary evaluation of the feasibility of miscible flare gas injection based on phase behavior computations of  a model oil (43% n-C5H12 : 57% n-C16H34) and a model flare gas (91% CH4  : 9% C2H6). The computations employed the multiple mixing-cell  model  with  Peng-Robinson  and  PC-SAFT  equations  of  state,  and compared the minimum miscibility pressure (MMP) value in the cases of flare gas  injection  and  CO2  injection.  For  CO2  injection,  both  equations  of  state produced  MMP  values  close  to  the  measured  value  of  10.55  MPa.  Flare  gas injection MMP values were predicted to be 3.6-4.5 times those of CO2  injection. This very high MMP implies high gas compression costs, and may compromise the  integrity  of  the  reservoir.  Subsequent  studies  shall  explore  the  gas -oil miscibility  behavior  of  mixtures  of  flare  gas  with  intermediate  hydrocarbon gases and  CO2,  in  order to  identify  a suitable approach for rendering flare  gas feasible as an injection gas in MGF-EOR.

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