JSE Journal of Science and Engineering 2021-07-16T00:00:00+00:00 Waluyo Adi Siswanto Open Journal Systems <p>ISSN 2723-3944<br>Publication: Twice a year (January and July)<br> Index:&nbsp; Google Scholar, PKP Index, Crossref, Publons, Scilit, ICI World of journals, ResearchBib, OneSearch<br> JSE Journal of Science and Engineering is an open-access and peer-reviewed scholarly international journal for engineers and technologist. This journal accepts unpublished research and review papers in the areas of Mechanical and Manufacturing Engineering, Structural and Civil Engineering, also Informatics and Information Technology. Potential authors are invited to submit articles in English. Each published article has a permanent Digital Object Identifier (DOI) in compliance with the international standard ISO 26324.</p> The Effective Control Strategy in Gunung Lingai Village due to Extreme Flood with SWOT Approach 2021-03-16T21:48:05+00:00 Santi Yatnikasari Sigiet Haryo Pranoto Pitoyo Pitoyo <p>Samarinda is the capital of the East Kalimantan, which remains troubled by flood risk. The flooding phenomenon happens not only during the rainy season. Some areas in the city of Samarinda are flooded in the rain with a period of 3 hours. This research aims to establish the causes of flooding in Gunung Lingai Village, as then flood control techniques can be implemented. Gunung Lingai Village has been chosen because it is a location with a history of extreme flooding in the town of Samarinda with an area of ​​432.93 Ha. There are 851 flood-affected households from 1390 households with a duration of further than 7 days. This research was carried out with the combination of qualitative and quantitative approaches. Data collection was carried out by combining literature study and secondary data with factual studies to obtain primary data and in-depth interviews with flood-affected communities <em>(mixed method)</em>. The status of the flood variables which became the baseline was that of 9 June 2019 and that of 22 May 2020. The results showed that there were two main factors causing flooding, namely natural factors and human factors. A vulnerability of social indicator was established to describe the actual condition, which was complex interaction among drainage system and public welfare. In addition, a SWOT analysis was performed on one of the selected representatives to verify the strategies on flood control system.</p> 2020-09-07T00:00:00+00:00 ##submission.copyrightStatement## Effects of Percentage Fibre with Treated and Untreated on Sound AbsorptionProperties in Rubber Wood Fibre Composite 2021-03-16T21:48:05+00:00 Muhammad Hanafi Abd Rahman Zaleha Mohamad <p>Current developments on natural fibre as sound absorption purpose have attracted researcher’s attention since sound pollution has been a threat to peoples. Hence, in this study, a fibrous acoustic material, which is rubber wood fibre, was used to determine acoustical properties. To achieve higher sound absorption coefficient (SAC) especially at low frequency, pre-treatment of the fibre is needed where in this study alkaline treatment was implemented. Three different percentages of fibre, namely 20%, 25% and 30% for non-treated and treated fibre were used to study the acoustical characteristic. Impedance tube method (ITM) was used to determine SAC. From the result, it has been found that SAC for fibre treated with alkaline was better than untreated fibre at low frequency. Alkaline treatment of the rubber wood fibre reduced the fibre diameter. More tortuous path and higher airflow resistance occurred since more fibre needed to reach the volume density of the sample. This work confirms by increasing rubber wood fibre content in the sample would also increase the acoustic performance and this has been proved where 30% of fibre sample mostly demonstrated better SAC compared to other fibre content for untreated and treated fibre and can be considered as sound absorption application</p> 2020-09-08T10:44:15+00:00 ##submission.copyrightStatement## The Sound Absorption Coefficient and Noise Reduction Coefficient of Rice Husk Silica 2021-03-16T21:48:05+00:00 Tan Ke Wei Zaleha Mohamad <p>Efficient noise control is neccessary to be applied to reduce the sound pollution and obtain a comfortable life. Rice husk is one of the abandoned agriculture waste material that can obtained in a large quantity which have the potential in the application of sound absorber. Rice husk silica samples have been fabricated in various composition and thickness by using epoxy and methyl ethyl ketone peroxide (MEKP) as binder. Impedance tube testing and physical test are conducted to obtain the properties of rice husk silica. The result found that specimens with higher composition of rice husk silica and using MEKP as binder have the lowest density, highest porosity and give a better sound absorption coefficient. The increment of thickness can produce a greater sound absorption at lower frequency. The results also demonstrate 20mm is the best thickness for a greater noise reduction coefficient.</p> 2020-09-15T13:33:53+00:00 ##submission.copyrightStatement## Crack Propagation Trajectory For Kenaf Fibre Composite Under Quasi Static Loading 2021-03-16T21:48:06+00:00 Nurul Alya Zahari Zaleha Mohamad <p>The cracking of the composites are worthy the attention in order to expect in which manner of failure might occur. This matter should be not underestimated because of a safe structure may fail with even microscopic flaws. The crack propagation trajectory and effects of the hole in woven and non-woven fibre orientations for epoxy based kenaf composites under quasi static loading are investigated. The shape of the work specimens is square thin plate with thickness of 3 mm. There are two types of orientations of work specimen used which are the non-woven random and plain woven with 0° and 90° fibre orientation. These work specimens made by hand lay-up method. There are three setting conditions of the work specimen used in this research such as single edge crack, single edge crack with hole, and double edge crack with two holes. The experiments of tensile tests were carried out to determine the strength of the epoxy based kenaf composites. The specimens were subjected to a concentrated load at the upper edge and fixed at the lower edge. From the data attained, indicated that fibre orientation has a significant role in defining the ultimate tensile strength. The main objective of this research is to investigate the crack propagation trajectory for epoxy based kenaf composites under quasi static loading. It shows that from the results obtained, the crack trajectories for single edge crack is a straight line. However, the existence of the hole rearrange the stress or strain field. The crack will curved towards the hole. Meanwhile, for double edge cracks with two holes, the cracks move to the near hole. The cracks then reoriented horizontally as the cracks have reformed the stress distribution at each other’s tip. After that, the cracks then captivated again by the opposite holes and curved toward s the holes. It was found that there is no significant difference between the crack propagation for non-woven and woven fibre orientation samples.</p> 2020-09-15T13:36:13+00:00 ##submission.copyrightStatement##