cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota bandung,
Jawa barat
INDONESIA
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)
Arjuna Subject : -
Articles 1,267 Documents
 52   53   54   55   56 
Characteristics of Silica Nanoparticles from Rice Husk as Influenced by Surface Modification with Used Solvent Containing Silane Kendri Wahyuningsih; Sri Yuliani; Hoerudin Hoerudin
Journal of Engineering and Technological Sciences Vol. 53 No. 4 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.4.3

Abstract

Silica extracted from rice husk (silica nanoparticles, Si-NP RHA) has great potential for industrial use, particularly as filler in the rubber industry. However, silica is poorly dispersed in the matrix and needs to be modified by a silane linking agent (bis-(3-triethoxysilylpropyl) tetrasulfane (TESPT)) to improve its mixing properties. As a result, a large amount of used solvent containing silane TESPT is produced. This study aimed to evaluate the surface modification of silica nanoparticles from rice husk employing this used solvent and to characterize the particles’ physical properties. Silica nanoparticles were extracted from rice husk using a sol-gel method. FTIR spectography demonstrated that the TESPT on fresh solvent and the used solvent were successfully grafted onto the surface of Si-NP RHA. Si-NP RHA modified by Two Step Modification (TSM) employing used solvent had strong absorption peaks at wave numbers of 2927.94 cm-1 and 1446.61 cm-1, which are associated with vibration of the ‑CH2 group and deforming vibration of the -C-H group in TESPT compounds. Likewise, Si-NP RHA modified with One Step Modification (OSM), either using fresh solvent or the used solvent, exhibited absorption peaks at wave numbers 2935.66 cm-1 and 1404.18 cm-1. The result showed that the used solvent still effectively modified the silica nanoparticle surface. 
Airflow Characteristics Investigation of a Diesel Engine for Different Helical Port Openings and Engine Speeds Willyanto Anggono; Mitsuhisa Ichiyanagi; Reina Saito; Gabriel J. Gotama; Chris Cornelius; Ryera Kreshna; Takashi Suzuki
Journal of Engineering and Technological Sciences Vol. 53 No. 3 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.3.6

Abstract

Intake airflow characteristics are essential for the performance of diesel engines. However, previous investigations of these airflow characteristics were mostly performed on two-valve engines despite the difference between the airflow of two-valve and four-valve engines. Therefore, in this study, particle image velocimetry (PIV) investigations were performed on a four-valve diesel engine. The investigations were conducted under different engine speeds and helical port openings using a swirl control valve (SCV). The results suggest that the position of the swirl center does not significantly shift with different engine speeds and helical port openings, as the dynamics of the flow remained closely similar. The trends of the airflow characteristics can be best observed during the compression stroke. A higher engine speed increases the angular velocity of the engine more compared to the increase of the airflow velocity and results in a lower swirl ratio of the flow. On the other hand, a higher engine speed leads to a higher mean velocity and the variation of velocity results in a larger turbulence intensity of the flow. Increasing the helical port opening brings a reduction in the swirl ratio and turbulence intensity as more airflow from the helical port disturbs the airflow from the tangential port.
COVID-19 Prevention: Role of Activated Carbon Md Sumon Reza; ABM Kamrul Hasan; Abu Saleh Ahmed; Shammya Afroze; Muhammad Saifullah Abu Bakar; Shafi Noor Islam; Abul Kalam Azad
Journal of Engineering and Technological Sciences Vol. 53 No. 4 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.4.4

Abstract

Recently, Coronavirus Disease 2019 (COVID-19) has brought the whole world into a pandemic condition, where the number of infected cases and deaths is exponentially high. A number of vaccines are available for this novel virus, but these are in the preliminary stage and are also not available to everyone. As the virus is very contagious, protection and prevention are the best way to survive and get rid of this disease. The virus affects the human body by entering through the nose, mouth, and eyes, so face protection with an appropriate mask is highly advisable. Combined masks made with activated carbon (AC) can effectively adsorb the virus because of its high surface area and broad functional groups. Such combined masks can also control coronavirus transmission by capturing harmful gases and smoke as they help in decreasing the spread of the virus
Identification of Micro-plastic Contamination in Drinking Water Treatment Plants in Phnom Penh, Cambodia Sandhya Babel; Hakk Dork
Journal of Engineering and Technological Sciences Vol. 53 No. 3 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.3.7

Abstract

Micro-plastics (MP) contamination in drinking water has become a global concern. Its negative impacts on human health have been reported. This study identified the presence of MP in two different drinking water treatment plants (WTP) in Phnom Penh, Cambodia, and investigated their removal efficiency. Samples were collected from the inlet, sedimentation, sand filtration, and distribution tank to quantify the removal by each unit. An optical microscope and a fluorescence microscope were used to detect the MP in four size fractions: 6.5-20, 20-53, 53-500, and >500 µm. Fourier transform infrared spectroscopy (FT-IR) was used to identify the polymer type for particles with size fractions of 53-500 and >500 µm. The results showed that the MP counted in WTP1 were 1180.5 ± 158 p/L in the inlet and 521 ± 61 p/L in the distribution tank. In WTP2, the MP counted were 1463 ± 126 p/L in the inlet and 617 ± 147 p/L in the distribution tank. The smaller size fraction of 6.5-20 µm predominated at each sampling location. Fragments were the most abundant morphology compared to fibers in all sampling points of both plants. PET predominated and the overall percentages for the inlet tank were 28.8% and 26%, followed by PE with 27.1% and 20.8% in WTP1 and WTP2, respectively. Other common polymer types were PP, PA, PES, and cellophane, while all others accounted for less than 5%. The results of the study showed that a significant number of MP remained in the water distribution system.
Bayah Natural Zeolites to Upgrade the Quality of Bio Crude Oil from Empty Fruit Bunch Pyrolysis Anton Irawan; Yazid Bindar; Teguh Kurniawan; Hafid Alwan; Rosid Rosid; Nisa Aina Fauziah
Journal of Engineering and Technological Sciences Vol. 53 No. 3 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.3.8

Abstract

Currently, the fuel oil for transportation and industry is produced mostly from fossil fuels. Because fossil fuels are a limited resource, biomass could be an alternative resource. Empty fruit bunch (EFB) is biomass waste from fresh fruit bunch processing in palm oil mills. EFB can be converted to bio-crude oil through pyrolysis at temperatures from 400 to 600 °C. The quality of bio-crude oil must be upgraded due to its high oxygen content. Esterification of bio-crude oil potentially improves the quality of bio-crude oil by using zeolite as catalyst. The purpose of this research was to investigate the properties of Bayah natural zeolites for upgrading the quality of bio-crude oil from EFB pyrolysis. Bayah natural zeolite was activated using various NaOH concentrations. Characterization of the natural zeolites was performed by using X-ray diffraction (XRD), scanning electron microscope-energy dispersive X-ray (SEM-EDX), and nitrogen physisorption. The optimum ratio of Si/Al of the modified Bayah natural zeolites was 3.91. The surface area of the parent was initially 19 m2/g and increased significantly to 150 m2/g after treatment with 0.4 M NaOH solution. The application of the activated zeolites for bio-crude oil esterification successfully decreased the total acid number.
Comparison of Liquid Product Characteristics of PFAD Metal Soap Decarboxylation by Batch and Continuous Process Godlief F. Neonufa; Lidya Elizabeth; Endar Puspawiningtiyas; Meiti Pratiwi; Astri Nur Istyami; Ronny Purwadi; Tatang H. Soerawidjaja
Journal of Engineering and Technological Sciences Vol. 53 No. 3 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.3.11

Abstract

Well-run continuous processes will benefit the industrial world in the future. This paper investigated the effect of batch and continuous processes on metal basic soap decarboxylation in terms of the liquid product characteristics. The metal soap used in the process was made from palm fatty acid distillate (PFAD) reacted with mixed metal oxides of Zn, Mg, and Ca. While the batch decarboxylation was carried out in a batch reactor at 400 °C for 5 hours, the continuous decarboxylation was conducted at 400 °C with a feed flow rate of 3.75 gr/minutes. Theoretically, the yield of batch decarboxylation is 76.6 wt% while the yield of continuous decarboxylation is 73.37 wt%. The liquid product was fractionated to separate short-chain hydrocarbon of C7-C10 (gasoline fractions) from medium- to long-chain hydrocarbons, or greater than C11 (green diesel fraction). The result showed that the alkane content from the batch process was higher than from the continuous process, whereas the continuous process produced more ketone products compared to the batch process. Furthermore, the GC-FID analysis showed a similar amount of total hydrocarbon (alkane, iso-alkane, and alkene) in both the batch and the continuous process.
Correlation between Phase Behavior and Interfacial Tension for Mixtures of Amphoteric and Nonionic Surfactant with Waxy Oil Rani Kurnia; Deana Wahyuningrum; Doddy Abdassah; Taufan Marhaendrajana
Journal of Engineering and Technological Sciences Vol. 53 No. 5 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.5.1

Abstract

Phase behavior tests in the surfactant screening process for EOR applications remain one of the relatively convenient ways to design an optimum surfactant formulation. However, phase behavior studies are unable to provide quantitative data for interfacial tension, which is one of the parameters that must be considered when selecting surfactants for EOR. Several studies related to the prediction of interfacial tension through phase behavior testing have been carried out. In this paper, the Huh correlation was used to estimate the interfacial tension value based on phase behavior tests. It was found that the current form of the Huh correlation may be applied for the below-to-optimum salinity condition. Furthermore, the constants of the equation vary depending on the surfactant type and mixtures.  
New Method of Materials Flow Calculation for Double-String SLCI Type Cement Plant (Part 1: The Whole Clinker Plant) Prihadi Setyo Darmanto; Izzan Hakim Muzakki; I Made Astina; Firman Bagja Juangsa; Alfi Amalia; Arief Syahlan
Journal of Engineering and Technological Sciences Vol. 53 No. 5 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.5.6

Abstract

Materials flow values are instrumental in many industries for controlling and simulating processes, designing new equipment as well as modifying existing plants. They are sometimes impossible to determine by direct measurement in an operating plant due to the very high temperatures. This study attempted to overcome the difficulties associated with this measurement by proposing a new method to calculate materials flow of a double-string suspension preheater type of cement plant with separate line and in-line calciners (SLC-I), with heat balance error less than 1%. This study was divided into two sequential parts, with the first part presented in this paper. The methodology of the first part was to solve the conservation law of the main clinker plant equipment, supported by Bogue’s equation, the heat of calcination, and the thermodynamic properties of the related materials. The least-square method was employed for solving the overdetermined system equations obtained in the second part. The results of the first part were: the ratio of heat formation to specific heat consumption was 52.13% (> 50%), and the gas exhausted from the plant yielded more than 117 MW heat equivalent, which can potentially be recovered for electricity production.
Evaluation of Lateral and Axial Deformation for Earth Pressure Balance (EPB) Tunnel Construction Using 3 Dimension Finite Element Method Fahmi Aldiamar; Masyhur Irsyam; Bigman Hutapea; Endra Susila; Ramli Nazir
Journal of Engineering and Technological Sciences Vol. 53 No. 5 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.5.3

Abstract

Mass Rapid Transit Jakarta (MRTJ) phase 1 tunnel construction using the earth pressure balance method has been completed and surface settlement and lateral displacement data according to elevation and inclinometer readings has been collected to evaluate the effect of tunnel’s construction on surrounding infrastructure. Soil stratification along the research area, defined according to boring logs and soil parameters for the hardening soil model (HSM) and the soft soil model (SSM), was determined by optimization of stress-strain curve fitting between CU triaxial test, consolidation test and soil test models in the Plaxis 3D software. Evaluation of the result of surface settlement measurements using an automatic digital level combined with geodetic GPS for elevation and position control points showed that the displacement behavior was affected by vehicle load and stiffness of the pavement. Lateral displacement measurements using inclinometers give a more accurate result since they are placed on the soil and external influences are smaller than surface settlement measurement. The result of 3D finite element modeling showed that surface settlement and lateral displacement during TBM construction can be predicted using HSM with 2% contraction. SSM and the closed-form solutions of Loganathan and Poulos are unable to provide a good result compared to the actual displacement from measurements.
Thermal Performance Analysis of a Newly Designed Circular Firewood Boiling Salt Stove Apichart Srichat; Weerapol Kaewka; Ponthep Vengsungnle; Songkran Wiriyasart; Paisarn Naphon
Journal of Engineering and Technological Sciences Vol. 53 No. 5 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.5.7

Abstract

Different biomass stoves are introduced and distributed among people living in rural and urban areas, especially in developing countries. For salt crystal production in Thailand’s rural north-eastern area, open fire stoves are used in domestic and small productive activities. Their thermal efficiency is very low for converting heat into utilization energy. A new stove with a circular configuration was designed and constructed to consider its thermal efficiency and economics, which were compared with those from a traditional and an improved traditional stove. The obtained thermal efficiency of the newly designed stove was 14.77% higher than that of the improved stove and 81.45% higher than that of the traditional stove. For the same initial saline volume, the final amounts of salt crystals and salt flowers obtained from the newly designed stove was higher compared with those obtained from the improved stove and the traditional stove, respectively, resulting in a 69.25% shorter payback period.

Page 54 of 127 | Total Record : 1267

 52   53   54   55   56 

Filter by Year

2003 2023


Reset
Filter By Issues
All Issue Vol. 55 No. 6 (2023) Vol. 55 No. 5 (2023) Vol. 55 No. 4 (2023) Vol. 55 No. 3 (2023) Vol. 55 No. 2 (2023) Vol. 55 No. 1 (2023) Vol. 54 No. 6 (2022) Vol. 54 No. 5 (2022) Vol. 54 No. 4 (2022) Vol. 54 No. 3 (2022) Vol. 54 No. 2 (2022) Vol. 54 No. 1 (2022) Vol. 53 No. 6 (2021) Vol. 53 No. 5 (2021) Vol. 53 No. 4 (2021) Vol. 53 No. 3 (2021) Vol. 53 No. 2 (2021) Vol. 53 No. 1 (2021) Vol. 52 No. 6 (2020) Vol. 52 No. 5 (2020) Vol. 52 No. 4 (2020) Vol 52, No 3 (2020) Vol. 52 No. 3 (2020) Vol. 52 No. 2 (2020) Vol 52, No 2 (2020) Vol. 52 No. 1 (2020) Vol 52, No 1 (2020) Vol 51, No 6 (2019) Vol. 51 No. 6 (2019) Vol. 51 No. 5 (2019) Vol 51, No 5 (2019) Vol. 51 No. 4 (2019) Vol 51, No 4 (2019) Vol 51, No 3 (2019) Vol. 51 No. 3 (2019) Vol 51, No 2 (2019) Vol 51, No 2 (2019) Vol. 51 No. 2 (2019) Vol 51, No 1 (2019) Vol 51, No 1 (2019) Vol. 51 No. 1 (2019) Vol. 50 No. 6 (2018) Vol 50, No 6 (2018) Vol 50, No 6 (2018) Vol 50, No 5 (2018) Vol. 50 No. 5 (2018) Vol 50, No 5 (2018) Vol 50, No 4 (2018) Vol. 50 No. 4 (2018) Vol 50, No 4 (2018) Vol. 50 No. 3 (2018) Vol 50, No 3 (2018) Vol 50, No 3 (2018) Vol. 50 No. 2 (2018) Vol 50, No 2 (2018) Vol 50, No 2 (2018) Vol 50, No 1 (2018) Vol. 50 No. 1 (2018) Vol 49, No 6 (2017) Vol 49, No 6 (2017) Vol. 49 No. 6 (2017) Vol. 49 No. 5 (2017) Vol 49, No 5 (2017) Vol 49, No 5 (2017) Vol. 49 No. 4 (2017) Vol 49, No 4 (2017) Vol 49, No 4 (2017) Vol 49, No 3 (2017) Vol 49, No 3 (2017) Vol. 49 No. 3 (2017) Vol 49, No 2 (2017) Vol 49, No 2 (2017) Vol. 49 No. 2 (2017) Vol 49, No 1 (2017) Vol. 49 No. 1 (2017) Vol 48, No 6 (2016) Vol 48, No 6 (2016) Vol. 48 No. 6 (2016) Vol 48, No 5 (2016) Vol. 48 No. 5 (2016) Vol 48, No 5 (2016) Vol. 48 No. 4 (2016) Vol 48, No 4 (2016) Vol. 48 No. 3 (2016) Vol 48, No 3 (2016) Vol. 48 No. 2 (2016) Vol 48, No 2 (2016) Vol 48, No 1 (2016) Vol. 48 No. 1 (2016) Vol 47, No 6 (2015) Vol. 47 No. 6 (2015) Vol. 47 No. 5 (2015) Vol 47, No 5 (2015) Vol 47, No 4 (2015) Vol. 47 No. 4 (2015) Vol. 47 No. 3 (2015) Vol 47, No 3 (2015) Vol 47, No 2 (2015) Vol. 47 No. 2 (2015) Vol 47, No 1 (2015) Vol. 47 No. 1 (2015) Vol. 46 No. 4 (2014) Vol 46, No 4 (2014) Vol. 46 No. 3 (2014) Vol 46, No 3 (2014) Vol 46, No 2 (2014) Vol. 46 No. 2 (2014) Vol 46, No 1 (2014) Vol. 46 No. 1 (2014) Vol 45, No 3 (2013) Vol. 45 No. 3 (2013) Vol. 45 No. 2 (2013) Vol 45, No 2 (2013) Vol. 45 No. 1 (2013) Vol 45, No 1 (2013) Vol. 44 No. 3 (2012) Vol 44, No 3 (2012) Vol 44, No 2 (2012) Vol. 44 No. 2 (2012) Vol. 44 No. 1 (2012) Vol 44, No 1 (2012) Vol. 43 No. 3 (2011) Vol 43, No 3 (2011) Vol. 43 No. 2 (2011) Vol 43, No 2 (2011) Vol. 43 No. 1 (2011) Vol 43, No 1 (2011) Vol 42, No 2 (2010) Vol. 42 No. 2 (2010) Vol. 42 No. 1 (2010) Vol 42, No 1 (2010) Vol. 41 No. 2 (2009) Vol 41, No 2 (2009) Vol. 41 No. 1 (2009) Vol 41, No 1 (2009) Vol. 40 No. 2 (2008) Vol 40, No 2 (2008) Vol. 40 No. 1 (2008) Vol 40, No 1 (2008) Vol 39, No 2 (2007) Vol. 39 No. 2 (2007) Vol. 39 No. 1 (2007) Vol 39, No 1 (2007) Vol. 38 No. 2 (2006) Vol 38, No 2 (2006) Vol. 38 No. 1 (2006) Vol 38, No 1 (2006) Vol. 37 No. 2 (2005) Vol 37, No 2 (2005) Vol 37, No 1 (2005) Vol. 37 No. 1 (2005) Vol 36, No 2 (2004) Vol. 36 No. 2 (2004) Vol. 36 No. 1 (2004) Vol 36, No 1 (2004) Vol 35, No 2 (2003) Vol. 35 No. 2 (2003) Vol 35, No 1 (2003) Vol. 35 No. 1 (2003) More Issue