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Journal of Engineering and Technological Sciences

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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 2 (2016)" : 10 Documents clear

Experimental Study of an SWH System with V-Shaped Plate Jalaluddin, Jalaluddin; Arif, Effendy; Tarakka, Rustan
Journal of Engineering and Technological Sciences Vol 48, No 2 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Solar energy is known as an environmentally friendly energy source with a wide range of applications. This energy can be utilized in various applications such as domestic and industrial water heating using solar water heating (SWH) systems. The thermal performance of an SWH system using a V-shaped absorber plate is presented in this study. Two SWH systems with different absorber plates, i.e. a flat-plate and a V-shaped plate, have been investigated experimentally. First, the absorptivity of the absorber plates was calculated analytically. The optimum V-shaped configuration with angle at Î² = 21Â° (V-shaped dimensions t = 4 cm and l = 4 cm) was determined from various V-shaped plate absorbers based on their absorptivity and applied in the experimental study. Two SWH systems were installed and tested at a low flowrate of 0.5 L/min and at a high flowrate of 2 L/min. The results showed that the SWH system with V-shaped plate absorber had a 3.6-4.4% better performance compared with that of the system with flat-plate absorber.

Potential of Reinforced Indonesian Glulam Beams Using Grade I (Bengkirai), Grade II (Kamper), Grade III (Nyatoh) Woods for Use in Structural Wood Design Sugiri, Saptahari; Alamsyah, Eka Mulya; Usman, Arie Putra
Journal of Engineering and Technological Sciences Vol 48, No 2 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Wood is a natural resource that is renewable and available in various species in tropical countries. Its abundancy in nature makes it easy to obtain, thus making it a nature friendly material for use in construction. Indonesia is the most important source of tropical wood in the world after Brazil, making the use of wood for structural elements very desirable. It is estimated that 4000 different varieties of wood exist in Indonesia. This estimate is based on the herbarium species collected by the Forestry Research Institute, currently counting nearly 4000 types of trees with a diameter of more than 40 cm. In the Indonesian wood structure code, the strength of woods is divided into 3 grades (grade I, II and III). This paper presents an evaluation of the mechanical properties of glulam wood sourced from native Indonesian timber: Bengkirai wood (grade I), Kamper wood (grade II), and Nyatoh wood (grade III), thus proving the potential for Indonesian wood as industrial structural elements in wooden constructions.

Hydraulic Fracturing Mechanism in Reservoirs with a Linear Inclusion Fissure Wenwu, Wang; Xiuxing, Zhu; Guigen, Ye; Zhongying, Han; Shifeng, Xue
Journal of Engineering and Technological Sciences Vol 48, No 2 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Hydraulic fracturing technology is widely used in most oil-water wells to improve production. However, the mechanism of fracturing in a reservoir with inclusion fissures is still unclear. In this study, a theoretical model was developed to determine the stress distribution during hydraulic fracturing. The line inclusion fissure was regarded as a thin bar and the stress around the artificial fracture, which is affected by a single line inclusion, was determined using the Eshelby equivalent inclusion theory. Stress intensity factors at the tip of both the artificial fracture and the inclusion were achieved, and initiation of the fracture was predicted. Furthermore, to validate the theoretical model, re-fracturing experiments were performed on a large-scale tri-axial system. The results showed that the defects reduce the intensity of the rock, which introduces the possibility that more complex fractures emerge in the reservoir. The results also showed that the fracture direction is governed by far-field stress. The obtained conclusions are helpful to better understand the mechanism of hydraulic fracturing in reservoirs.

Development of Green Pavement for Reducing Oxides of Nitrogen (NOx) in the Ambient Air Dewi, Kania; Khair, Hafizhul; Irsyad, Moh.
Journal of Engineering and Technological Sciences Vol 48, No 2 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

The transportation sector is the biggest contributor to air pollution in Indonesia, especially in metropolitan cities. Gases such as oxides of nitrogen (NOx) are produced during the combustion of fossil fuels in the internal combustion of vehicle engines. Oxides of nitrogen such as nitric oxide (NO) and nitrogen dioxide (NO2) are important air pollutants, because they cause significant harm to human health and play an important role in being precursors of other dangerous pollutants such as photochemical smog. One of the simple ways to reduce NOx concentrations is utilizing a catalytic process involving UV light and semiconductor particles such as TiO2. Illuminated TiO2 UV light is capable of producing an electron (e-) and hole (h-) pair, which initiates a chemical reaction that alters the NOx to become NO3- or NO2-. A field scale paving block reactor coated with TiO2 placed by the roadside was exposed to UV light using various exposure times. The results showed that the sample with a composition of 200 g/m2 TiO2 was capable of adsorbing NOx gas at an average rate of 0.0046 mg/m2/minute. Additional costs due to TiO2 coating for every square meter of paving are IDR 13,180.

Absorption of CO2 in Biogas with Amine Solution for Biomethane Enrichment Kamopas, Wassana; Asanakham, Attakorn; Kiatsiriroat, Tanongkiat
Journal of Engineering and Technological Sciences Vol 48, No 2 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Biogas upgrading with carbon dioxide absorption in a column of monoethanolamine (MEA) solution was carried out. The effects of controlled parameters on the CO2 absorption such as gas flow rate, solution concentration, height to diameter ratio of the column were considered. High CH4 concentration could be achieved at low gas flow rate and high MEA concentration. The CH4 concentration could be up from 70-75% to 92-95% by volume for 0.2 M MEA. A set of breakthrough curves was obtained to determine the absorption characteristics, such as the absorption constant (k), the absorption time when the CO2 concentration at the outlet was 50% of the concentration at the inlet (t), and the absorption period (t*) when the CH4 concentration was over 90%. An empirical equation of the methane enrichment with the related parameters was developed.

An Analysis of the Effect of the Implementation of an Integrated Management System (IMS) on Work Ergonomics in an O&M Power Plant Company Ifadiana, Dewi Permata; Soemirat, Juli
Journal of Engineering and Technological Sciences Vol 48, No 2 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Ergonomics has developed significantly for the prevention of related accidents. Its implementation, however, depends on the existing management system within a company. The integrated management system (IMS) is frequently implemented in industry, which is an integration of ISO 9001, ISO 14001, and OHSAS 18001. The objectives of this research were to analyze the effects of IMS implementation on work ergonomics and to find the influencing factors. The methods used were the 4x4 method for investigating accidents; interviews; and a questionnaire for workers and managers at an electricity company. The subjects were divided into three levels, namely: top management, middle management, and workers. Logistic regression was used to analyze and estimate the effects of one or more management variables on ergonomics related accidents. The results showed that the implementation of IMS has supported work ergonomics very well based on the average scores, which ranged from 2.99 to 3.38. The logistic regression showed that the most influential IMS on work ergonomics was the Do (D) of Demingâs PDCA cycle, whereas the most influential parameter for ergonomics accident prevention was Policy (P) and Do (D) at the top management level.

A Reconstruction Method for Compressed Sampling in Shift-Invariant Spaces Luo, Junyi; Yang, Yuting
Journal of Engineering and Technological Sciences Vol 48, No 2 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

A traditional sampling method is that the signal should be sampled at a rate exceeding twice the highest frequency. This is based on the assumption that the signal occupies the entire bandwidth. In practice, however, many signals are sparse so that only part of the bandwidth is used. Compressed sampling has been developed for low-rate sampling of continuous time sparse signals in shift-invariant spaces generated by m kernels with period T. However, in general the reconstruction of compressed sampling signals is unstable. To reconstruct the signal, continuous reconstruction is replaced by generalized inverse. In this paper, periodic non-uniform sampling and the reconstruction of functions in shift-invariant spaces are discussed, the unique sparse expression is obtained by using the minimal L1 norm. Also, necessary condition and error of reconstruction were analyzed. Finally, the method was validated via simulation and it was shown that the method was effective.

Recovery of Lithium from Geothermal Fluid at Lumpur Sidoarjo by Adsorption Method Noerochim, Lukman; Satriawangsa, Gita Akbar; Widodo, Amien
Journal of Engineering and Technological Sciences Vol 48, No 2 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

The recovery of lithium from geothermal fluid at Lumpur Sidoarjo, Indonesia was investigated employing an adsorption method with polymer membrane as container. The lithium concentration in geothermal fluid from Lumpur Sidoarjo used in the present study was about 5 mg/l. Lithium manganese oxide (LMO) was selected as a promising adsorbent material due to its non-toxic, topotactical behavior and low cost. In this study, LMO with single Li/Mn mole ratio was prepared, i.e. Li1.6Mn1.6O4. The adsorbent was synthesized by solid state reaction at 500 Â°C for 5 hrs. A lithium uptake yield from the geothermal fluid of around 6.6 mg/g was obtained.

The Influence of PEG400 and Acetone on Polysulfone Membrane Morphology and Fouling Behaviour Aryanti, P.T.P.; Joscarita, Shelli R.; Wardani, Anita K.; Subagjo, S.; Ariono, Danu; Wenten, I Gede
Journal of Engineering and Technological Sciences Vol 48, No 2 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Modification of polysulfone ultrafiltration membrane was conducted by blending polysulfone with PEG400 and acetone as additives. The influence of each additive on the resulted membrane morphology and fouling characteristics were investigated. The experimental results showed that the hydrophilicity of the polysulfone membrane was improved by the increase of PEG400 in the polysulfone membrane. The water contact angle of the membrane was decreased from 76.1Â° to 38.31Â° when 35 %wt of PEG400 was added into the polysulfone solution, while the water content of the membrane was increased by around 38%. The high concentration of PEG400 in the polysulfone solution led to the formation of longer finger-like cavities in the membrane structure and resulted in a thicker membrane skin layer. The high concentration of PEG400 also contributed to the increase in hydraulic resistance of the membrane due to organic matter fouling. This problem could be minimized by the addition of acetone into the polysulfone solution, which resulted in a lower fouling resistance of organic matter during up to five hours of peat water filtration.

Cover Vol.48 No.2, 2016 Technological Sciences, Journal of Engineering and
Journal of Engineering and Technological Sciences Vol 48, No 2 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

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