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Journal of Engineering and Technological Sciences

JETS
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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 â€“ 2012) Proceedings ITB on Engineering Science (2003 - 2007) Proceedings ITB (1961 - 2002)

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Articles 10 Documents

Search results for , issue " Vol 48, No 4 (2016)" : 10 Documents clear

Sulfur Removal in Bio-Briquette Combustion Using Seashell Waste Adsorbent at Low Temperature Mahidin, Mahidin; Gani, Asri; Muslim, Abrar; Husin, Husni; Hani, M. Reza; Syukur, Muhammad; Hamdani, Hamdani; Khairil, Khairil; Rizal, Samsul
Journal of Engineering and Technological Sciences Vol 48, No 4 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Presently, biomass is mostly utilized as co-fuel in coal combustion in view of energy diversification and emission reduction. However, since the coal content of bio-briquettes is high (up to 80% in this study), gas emissions such as those of SOx still occur. Therefore, the introduction of SO2adsorbent is common in coal briquette or bio-briquette combustion. A calcium-based material is usually used for this goal. The aim of this study was to observe the effects of desulfurization temperature and Ca/S ratio (Ca = calcium content in adsorbent; S = sulfur content in coal and biomass) on desulfurization efficiency and kinetics. The ratio of coal to biomass (palm kernel shell/PKS) was fixed at 90:10 (wt/wt) and the ratios of Ca to S were varied at 1:1, 1.25:1, 1.5:1, 1.75:1 and 2:1. The mixtures of coal, PKS and adsorbent were briquetted at a molding pressure of 6 ton/cm2 with Jatropha curcas seeds and starch mixture as binding agents. Desulfurization was performed within a temperature range of 300 to 500Â°C for 720 seconds at an airflow rate of 1.2 L/min. The results showed that the highest desulfurization efficiency (90.6%) was associated with the Ca/S ratio of 2:1 and temperature of 400Â°C. Moreover, the highest reaction rate constant of desulfurization was 0.280 min-1.

Studying the Effect of Tunnel Depth Variation on the Specific Energy of TBM, Case Study: KarajâTehran (Iran) Water Conveyance Tunnel Mirahmadi, Majid; Tabaei, Morteza; Dehkordi, Mohsen Soleiman
Journal of Engineering and Technological Sciences Vol 48, No 4 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

The tunnel-boring machine (TBM) is a common piece of equipment used in tunneling projects. For planning a mechanical excavation project, prediction of TBM performance and the specification of design elements such as required forces are critical. The specific energy of excavation (SE), i.e. drilling energy consumption per unit volume of rock mass, is a crucial parameter for performance prediction of a TBM. In this study, the effect of variation of tunnel depth on SE by considering the post-failure behavior of rock mass was investigated. Several new relations between SE and tunnel depth are proposed according to the statistical analysis obtained from KarajâTehran Water Conveyance Tunnel real data. The results showed that there is a direct relation between both parameters and .A polynomial equations are proposed as the best expression of the correlation between these parameters.

Measurement of Seawater Flow-Induced Erosion Rates for Iron Surfaces using Thin Layer Activation Technique Kambali, Imam; Suryanto, Hari
Journal of Engineering and Technological Sciences Vol 48, No 4 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

The laboratory-scale erosion-corrosion testing facility at BATANâs Center for Radioisotope and Radiopharmaceutical Technology (PTRR) in Serpong was employed to simulate flow-induced corrosion of iron surfaces. Surface loss rates were measured by a nuclear technique called thin layer activation (TLA) analysis. A 10-MeV proton beam generated from a typical CS-30 cyclotron was used to produce 56Co radionuclide layers on iron surfaces via a 56Fe(p,n)56Co nuclear reaction. The labeled iron specimens were then exposed to circulating seawater simulated in BATANâs flow-induced corrosion test facility. The experimental results indicated that the TLA technique was able to measure a very low flow-induced erosion rate of 0.91Â±0.3 Âµm/hr. There was no significant difference in the measured surface loss rates between the remaining activity method and the concentration method. The iron surface loss in seawater was lower than that of the same material in HCl solution observed in earlier studies.

The Behavior of Slab-Column Joints of Reactive Powder Concrete under Cyclic Load Budiono, Bambang; Surono, Awal; Pane, Ivindra; Kurniawan, Ruddy
Journal of Engineering and Technological Sciences Vol 48, No 4 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Experimental work on four specimens of reinforced concrete slab- column connection sub-assemblages using reactive powder concrete (RPC) was conducted. The specimens were subjected to a combination of gravity and cyclic loading. The gravity loading was represented by a number of concrete cubes hung on the slab bottom surface and the cyclic lateral loading was applied on the upper end of the columns. The specimens consisted of two variables, i.e tensile flexural reinforcement ratio (0.65% and 1.8%) and slab span (2.0 m and 3.0 m). Shear reinforcement was not used in the slab. The displacement history consisted of three repeated cycles, starting from 0.07 to 5.00 percent drift ratio, covering the elastic and the inelastic response of the specimens. The RPC mixture proportion for the specimenâs material was developed using local materials and normal concrete technology methods. The average RPC compression tests results were 136.0 MPa at 28 days and 141.0 MPa at the time of the first specimen, tested at 56 days. The tests results showed that up to 5.0 percent drift all specimens had stable hysteresis loops without any significant degradation of strength and stiffness. The specimen with a larger tensile flexural reinforcement ratio developed more strength, stiffness and energy dissipation.

Cover Vol. 48 No. 4, 2016 Technological Sciences, Journal of Engineering and
Journal of Engineering and Technological Sciences Vol 48, No 4 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

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Improvement of Properties of Poly(L-lactic acid) through Solution Blending of Biodegradable Polymers Sitompul, Johnner; Insyani, Rizky; Prasetyo, Daniel; Prajitno, Hermawan; Lee, Hyung Woo
Journal of Engineering and Technological Sciences Vol 48, No 4 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

This study concerns the improvement and enhancement of the properties of poly(l-lactic acid) (PLLA) through simple solution blending of pure PLLA with different kinds of biodegradable polymers. Synthesized PLLA was blended with synthesized poly(d,l-lactic acid) (PDLLA) or poly(ethylene glycol) (PEG) at various composition ratios in a solvent mixture of dichloromethane/ethanol at room temperature to produce dipolymer. The polymer-blend properties were analyzed using FTIR, DSC, UTM data and an enzymatic degradation test was conducted. It was found that PLLA blend films were obtained with limitation of the second polymer content up to 20% (w) through solvent casting. From the DSC data, two different melting temperature peaks showed that stereocomplex formation occurred during polymer precipitation for all PLLA/PDLLA blends, while only one single melting temperature peak appeared in the PLLA/PEG blend. Regarding the mechanical properties, the PLLA/PEG blend showed better performance with an improvement of the mechanical strength by around 11.18% and an improvement of the elongation at break by around 89% compared to pure PLLA. Furthermore, after the 48-hour enzymatic biodegradability test, the PLLA/PEG blends showed improvement of biodegradability with 21.88% of sample weight-loss compared to 2.53% for pure PLLA.

Influence of Impregnation and Coprecipitation Method in Preparation of Cu/ZnO Catalyst for Methanol Synthesis Prasetyaningsih, Yusi; Hendriyana, Hendriyana; Susanto, Herri
Journal of Engineering and Technological Sciences Vol 48, No 4 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Cu/ZnO catalyst was succesfully prepared using a coprecipitation method. The mixing procedure of the Cu(NO3)2, Zn(NO3)2 and Na2CO3 solutions had an important influence on the characteristics of the catalyst. The best catalyst obtained was the one prepared with slow mixing of the salt solutions and a CuO/ZnO molar ratio of 50:50. This raw catalyst had a maximum surface area of about 61.6 m2/g. Increasing the CuO/ZnO molar ratio caused an agglomeration of precipitated particles, reducing the surface area. A much better catalyst was obtained using an impregnation method, in which g-Al2O3 was used as support. The impregnated catalyst had a surface area of about 151 m2/g. Activity tests were carried out in a fixed-bed reactor containing 1 g of catalyst and a flow of syngas at a rate of 60 mL/min. The reaction temperature was 170Â°C and the pressure was 20 barg. The best coprecipitated catalyst gave a CO conversion of about 10%, while the impregnated catalyst gave a CO conversion of up to 69%.

Brine Effluents: Characteristics, Environmental Impacts, and Their Handling Ariono, Danu; Purwasasmita, Mubiar; Wenten, I Gede
Journal of Engineering and Technological Sciences Vol 48, No 4 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Brine discharge is one of the largest sources of wastewater from industrial processes. Because of the environmental impacts arising from improper treatment of brine discharge and more rigorous regulations of pollution control, industries have started to focus on waste minimization and improving the process of wastewater treatment. Several approaches have been proposed to provide a strategy for brine handling by recovering both brine and water or to remove pollutant components so it complies with environmental regulations when discharged. One of the most promising alternatives to brine disposal is reusing the brine, which results in reduction of pollution, minimizing waste volume and salt recovery. The brine may also contain valuable components that could be recovered for profitable use. Also, water recovery from brine effluent is generally performed to save water. In the case of rejected brine from desalination plants, water recovery from higher brine concentrations has huge potential for salt production. This paper gives an overview of different types of brine effluents, their sources and characteristics. Also discussed are impacts of brine on the environment and management options related to their characteristics.

Cutting Capability Assessment of Highly Porous CBN Wheels by Microrelief of Plane Parts from 06Cr14Ni6Cu2MoWÐ¢i-Sh Steel Using Artificial Intelligence System Soler, Yakov Iosifovich; Tiem, Nguyen Manh; Le, Nguyen Van
Journal of Engineering and Technological Sciences Vol 48, No 4 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

The abrasive tools are the weakest element in the grinding process system, to which great attention is being paid by scientific and industrial collectives. Eleven highly porous wheels (HPWs) were tested: CBN30 (B76, B107, B126, B151) 100 OVK27-ÐF40; CBN30 B107 100 OVKC10-ÐF40; CBN30 B126 100(M, L) VK27- (ÐF25, ÐF40); LKV50 (B107, B126) 100 (M, O) VK27-ÐF40. Assessment of the surface topography was carried out by roughness parameters Ra, Rmax, and Sm(GOST 25472-82), which were considered random variables with their position and dispersion measures. Two artificial intelligence systems â fuzzy logic (FL) and neural networks (NN) â were used to analyze the HPWâs cutting capability (CC). In both cases, the best CC was predicted for grinding with CBN30 (B76 and B151) 100 OVK27-ÐF40 and LKV50 (B107) 100 OVK27-KF40. In the absence of a training process in FL modeling, the assessments for the wheels with a low CC were less reliable.

Soil-Structure Interaction of a Piled Raft Foundation in Clay â a 3D Numerical Study Susila, Endra; Anggraini, Nita
Journal of Engineering and Technological Sciences Vol 48, No 4 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Piled raft foundation designs consider the contribution of the pile cap in transferring load to the ground and distributing load over the piles. The concept of a piled raft foundation requires a comprehensive evaluation of a number of factors that affect the performance of the foundation system. In this research the interaction among piles, pile cap and soil of a piled raft system on medium and stiff clays was studied. The effects of various distances between piles (s/d) in affecting load transfer mechanisms and deformation were considered. The study was performed by utilizing the 3D finite element method with a professional software package called Plaxis3D Foundation. A case study of the piled raft foundation performances of a foundation design for a high-rise building based on the soil stratification in Jakarta was also performed and is presented in this paper.

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