Journal of Engineering and Scientific Research http://jesr.eng.unila.ac.id/index.php/ojs <p> </p> <table border="0" width="100%" cellspacing="0" cellpadding="5" align="center"> <tbody> <tr> <td bgcolor="#312b61"><strong><span style="font-size: 14px; font-family: 'Montserrat',Gotham,helvetica,arial,sans-serif; color: #ffffff;">Journal of Engineering and Scientific Research (JESR)</span></strong></td> </tr> </tbody> </table> <table border="0" width="100%" cellspacing="0" cellpadding="5" align="center"> <tbody> <tr> <td> <p align="justify">Welcome to JESR, <strong>pISSN: 2685-0338; eISSN: 2685-1695</strong>. JESR is initiated and persistently managed by a group of lecturers from interdisciplinary field in the Engineering Faculty, Universitas Lampung. JESR is a peer reviewed international journal which publishes original research as well as critical review articles in the field of engineering and applied sciences.</p> <p align="justify">We are delight to announce that JESR has been accredited by National Journal Accreditation (ARJUNA) Managed by Ministry of Research, Technology, and Higher Education, Republic Indonesia with Grade 4th (Sinta 4) since Vol. 1 Ed. 1, June 2019 and valid through Vol. 5 Ed. 2 December 2023. The accreditation is according to the <a title="https://arjuna.kemdikbud.go.id/files/info/Pemberitahuan_Hasil_Akreditasi_Jurnal_Ilmiah_Periode_I_Tahun_2022.pdf" href="https://arjuna.kemdikbud.go.id/files/info/Pemberitahuan_Hasil_Akreditasi_Jurnal_Ilmiah_Periode_I_Tahun_2022.pdf" target="_blank" rel="noopener">decree No. 105/E/KPT/2022.</a></p> <p align="justify">The focus and scopes of JESR is on but not limited to Mechanical Engineering and Material Sciences, Chemical and Environmental, Industrial and Manufacturing Engineering, Computer and Information Technology, Electrical and Telecommunication, Civil and Geodetic Engineering, Architecture and Urban Planning, Geophysical Science and Engineering, and other multidisciplinary research. The main criteria for publication are including the originality, scientific quality and interest to the aim and focus.</p> <p align="justify">JESR publishes twice a year for <strong>June and December</strong> editions. We welcome for publication collaborations with organizer of International Seminars, Conferences and Symposiums around the world. We are encouraging authors to submit their manuscript through our <a title="http://jesr.eng.unila.ac.id/index.php/ojs/login" href="http://jesr.eng.unila.ac.id/index.php/ojs/login"><strong>online system</strong></a>.</p> </td> </tr> </tbody> </table> <p> </p> en-US misfa@eng.unila.ac.id (JESR - Managing Editor) gigih@eng.unila.ac.id (Gigih Forda Nama) Sat, 30 Apr 2022 00:00:00 +0000 OJS 3.2.1.2 http://blogs.law.harvard.edu/tech/rss 60 Correlation of BMKG with TRMM for daily and monthly rainfall series in Banten region http://jesr.eng.unila.ac.id/index.php/ojs/article/view/78 <p style="margin: 0in;"><em><span style="font-size: 10.0pt; color: #0e101a;">Daily and monthly rainfall data series are necessary data for planning purposes in Civil Engineering and other fields. Incomplete rainfall data often occurs, so that rainfall data must be estimated based on rainfall data from several other nearby locations. The addition of rainfall data can lead to inaccurate planning.</span></em></p> <p style="margin: 0in;"><em><span style="font-size: 10.0pt; color: #0e101a;">Rainfall data used for planning in the civil engineering sector is usually taken from the BMKG station. This data is taken from the rainfall station above the ground. Besides, that&nbsp;</span></em><span style="font-size: 10.0pt; color: #0e101a;">can also produce rainfall data<em>&nbsp;from TRMM.&nbsp;</em>Can take rainfall data from TRMM<em>&nbsp;at all locations according to a coordinate of location. This rainfall data denotes an average rainfall taken from the satellite approximately 250 meters above the ground surface.</em></span></p> <p style="margin: 0in;"><em><span style="font-size: 10.0pt; color: #0e101a;">An equation will be obtained by comparing the daily and monthly rainfall data from the two data sources. Based on TRMM rainfall,</span></em><span style="font-size: 10.0pt; color: #0e101a;">&nbsp;we can use the equation<em>&nbsp;to estimate ground rainfall in a location.</em></span></p> <p style="margin: 0in;"><em><span style="font-size: 10.0pt; color: #0e101a;">In this study, daily rainfall, monthly rainfall, the spectrum of daily and monthly rainfall data from BMKG are compared with rainfall and the spectrum of daily and monthly rainfall data from TRMM. The analysis results show that the monthly rainfall data from TRMM and BMKG correlate better than daily rainfall data.</span></em></p> Ahmad Zakaria, Sumiharni Sumiharni Copyright (c) 2022 Journal of Engineering and Scientific Research http://jesr.eng.unila.ac.id/index.php/ojs/article/view/78 Tue, 23 Aug 2022 00:00:00 +0000 The effect of barite addition and graphite particle size on the specific abrasion of fly-ash/phenolic composite for brake lining application http://jesr.eng.unila.ac.id/index.php/ojs/article/view/102 <p><em>Annually, million tons of fly-ash and bottom fly-ash is a waste of coal power plant. Fly ash contains Iron-oxide, alumina and silica. Those hard particle makes fly-ash can be used as a reinforcement in polymer composite. This composite is a wear resistance material and can be used as material for brake lining application. Fly ash reinforced phenolic composite has a low specific abrasion. The composite for brake lining material consisted of the reinforcement, friction modifier, solid lubricant and filler. Graphite is used as solid lubricant while barite is used as filler. Many research were carried out research on the particle size effect on the composite mechanical properties. However the size different between the constituent in composite has not investigated. Also the optimal barite weight fraction has not being observed. The composite was made by mixing all of the constituent, pressing in the mold and curing. The result show that the graphite particle size </em>?<em> 150 </em><em>m</em><em>m has the lowest specific abrasion. The observation using scanning electron microscope shows that the composite contained small particle of </em>?<em> 56 </em><em>m</em><em>m tends to agglomerate than the composite contained larger particle of </em>? <em>150 </em><em>m</em><em>m. the composite contained 15% barite has the lowest specific abrasion. The micrograph of scanning electron microscope shows the mixed of phenolic and barite evenly covered the graphite and fly-ash particles.</em></p> Shirley Savetlana, Zulhanif Zulhanif, Harnowo Supriadi, Irvan Ramadhan , Teten Beliantara Copyright (c) 2022 Journal of Engineering and Scientific Research http://jesr.eng.unila.ac.id/index.php/ojs/article/view/102 Tue, 23 Aug 2022 00:00:00 +0000 Utilization of Natural Zeolites and Fly Ash (Coal) Mixture Physically Activated Using Furnace As A Pellet - shaped Air Filter To Increase Engine Torque, Tecumseh TD110. 4-Stroke Petrol Motor http://jesr.eng.unila.ac.id/index.php/ojs/article/view/99 <p><em>An air filter made from a mixture of natural zeolite and coal fly ash can be used to remove nitrogen (N<sub>2</sub>) and moisture (H<sub>2</sub>O) in the air. This filter can produce oxygen-rich air (O<sub>2</sub>) flowing into the combustion chamber to increase the quality of the combustion process so that complete combustion occurs and improve engine torque. In this research the filter was made from a physically activated mixture of natural zeolite and fly ash through heating in a furnace for 1 hour with temperature variations (200<sup>o</sup>C, 250<sup>o</sup>C, 300<sup>o</sup>C, 350<sup>o</sup>C), mass variations (50%, 75%, 100%) and variations in the composition of Z100%:F0%, Z75%:F25%, Z50%:F50%, Z25%:F75%, Z0%:F100%. Tests were carried out using a 4-stroke gasoline engine of Tecumseh TD110 located in the Motor Bakar and Propulsion Laboratory of the Mechanical Engineering Department, University of Lampung. Test results show that the biggest improvement in torque occurs in using a filter composition of Z50%:F50%, namely by 28.41%. The followed filter of the composition of Z75%:F25% is as big as 28.31%. The activation temperature of 350<sup>o</sup>C can improve the torque by 35.08%.</em></p> <p><input id="ext" type="hidden" value="1"></p> yudi risano Copyright (c) 2022 Journal of Engineering and Scientific Research http://jesr.eng.unila.ac.id/index.php/ojs/article/view/99 Tue, 23 Aug 2022 00:00:00 +0000 The DESIGN AND BUILD A CHILDREN'S TEMPERATURE MONITORING SYSTEM USING THE MLX90614 TEMPERATURE SENSOR AND NODEMCU ESP-12E BASED ON ANDROID http://jesr.eng.unila.ac.id/index.php/ojs/article/view/67 <p>The degree of children's health reflects the nation's health status, because children as the nation's next generation have abilities that can be developed in continuing the nation's development. The limited parental monitoring of children, so the authors make a child temperature monitoring device that can make it easier for parents to monitor their child's temperature in real time. This study uses a sensor temperature of the infrared MLX90614, NodeMCU ESP-12E as a controller programmed with the Arduino software idea later in the show via the LCD and the application blynk. This system was developed based on the needs of the children's monitoring system. The results of this research are that a child temperature monitoring system has been realized that can monitor the condition of a child's body in real time. Metode used isto compare data between Thermometer Gun with sensor systems ML&nbsp;X90614,&nbsp;then obtained an average difference of 0.019<sup>0</sup> C and an average error of 0.053%.</p> <p>&nbsp;</p> <p><strong>Keywords</strong>: Infrared sensor, MLX90614, real time, monitoring</p> Zidny Sholehan Abdullah Copyright (c) 2022 Journal of Engineering and Scientific Research http://jesr.eng.unila.ac.id/index.php/ojs/article/view/67 Tue, 23 Aug 2022 00:00:00 +0000 The effect of filler adding palm kernel shell ash on durability and marshall values properties of asphalt concrete mix http://jesr.eng.unila.ac.id/index.php/ojs/article/view/100 <p><em>Lampung&nbsp; Province is one of the palm oil producers, especially in&nbsp; Way Kanan Regency. Way Kanan Regency has two palm oil-producing mills, namely&nbsp; PT.&nbsp; Sawit&nbsp; Indo Mas which is located&nbsp; in Kampung Tanjung&nbsp; Raja Sakti Blambangan&nbsp; Umpu&nbsp; and PT PLP which is located&nbsp; in Kampung Bumi&nbsp; Agung, Bahuga District. The two factories duce thousands of tons of Crude Palm Oil (CPO)&nbsp;&nbsp; vegetable oil daily produced from palm fruit plants (Elaeis Guineensis Jacq, Arecaceae). From oil management, it is undeniable that it can create a lot of solid waste from the palm shell. Meanwhile, the government has not made much effort to use the waste from the waste. When managing palm fruit, palm shells cannot be processed into oil because they have a hard texture, so the shells are discarded and become waste. Then we use the shell for research material as a filler. Palm shell ash has a silicon dioxide&nbsp; (SiO2) content which is also contained in Portland cement, so this content can allow the acquisition of a good asphalt mixture on the AC-BC layer. This study aims to see the effect of the effectiveness of adding shell ash fillers from palm shell waste in marshall test tests and value the resulting durability. The addition of fillers with percentages of&nbsp; 20%, 30%, 40%, 50%and 60%. From the results obtained from the test results in the laboratory that the addition of shell ash fillers of 40% gets better performance compared to shell ash with percentages of&nbsp; 20%, 30%, and 60%, with a higher state value of 1225 kg shown. In marshall testing, using palm shell ash fillers can increase the value of&nbsp; KAO. So that from the marshall test, the durability value of the sample immersion at the IRS value of 0%&nbsp; was 98.4% greater than the 40%, which was&nbsp; 91.13%. Overall, using palm shell ash fillers meets the minimum requirements of Bina Marga as an asphalt mixture. The degree of weather change in immersion durability affects the strength level of the marshall test.</em></p> Amelia Oktavia, Irza Sukmana, Yanuar Zulardiansyah Arif, Gigih Forda Nama Copyright (c) 2022 Journal of Engineering and Scientific Research http://jesr.eng.unila.ac.id/index.php/ojs/article/view/100 Tue, 23 Aug 2022 00:00:00 +0000 The Effect of the use of Silica Sand Before and After Physical Activation on Acceleration of 4-Step Gasoline Motorcycle Engine http://jesr.eng.unila.ac.id/index.php/ojs/article/view/98 <p><em>This research was conducted with the aim of knowing the Effect of using silica sand before and after physical activation on the acceleration of a 4-stroke gasoline motorcycle engine. This research was conducted by testing the acceleration 0 – 80 km/hour and 40 – 80 km/hour with variations in the composition of tapioca in the pellet mixture (1%, 2%, and 3%) and variations in temperature activation (150<sup>?</sup>C, 200<sup>?</sup>). C, and 250<sup>?</sup>C). The silica sand pellets used in this study were 10 mm in diameter with a thickness of 3 mm, which had been activated for 60 minutes. The results showed that the use of silica sand had an effect on the acceleration of a 4-stroke gasoline motorcycle. The best composition of silica sand pellets occurs in the amount of tapioca 3% and with an activation temperature of 250<sup>?</sup>C, which can increase the acceleration by 12.45% at an acceleration of 0 – 80 km/hour</em><em>.</em></p> Akhmad Riszal, Sandy Dwi Hardin, Herry Wardono, M. Dyan Susila ES, A. Yudi Eka Risano Copyright (c) 2022 Journal of Engineering and Scientific Research http://jesr.eng.unila.ac.id/index.php/ojs/article/view/98 Tue, 23 Aug 2022 00:00:00 +0000 ANALYSIS CHARACTERISTICS OF PASSENGER IN ELECTION OF EXECUTIVE SHIP TRANSPORTATION MODE (CASES STUDY: BAKAUHENI-MERAK PORT) http://jesr.eng.unila.ac.id/index.php/ojs/article/view/96 <p><em>Ferry is one of the strategic water transportations, but Ferry is often not considered important in its development, so research are needed to examine the effect of passenger characteristics on executive ferry transportation.</em> <em>Mode selection is one of the models used in transportation planning, this is due to the key role of public transportation in an effort to improve services from transportation modes. This study was conducted to determine the characteristics and factors that influence passengers in choosing modes. The analysis of the mode selection model in this study uses logistic regression analysis with the help of the SPSS program. The results in the study explain that the factors that influence the choice of mode for executive ferry passengers are Income Level Variables (X5), Transportation to Port Variables (X7) and Ship Schedule Considerations Variables (X10). Results Based on statistical tests, the following logistic regression was obtained: Y = 0.049 + 1.593 X5 + 1.017 X7 + 0.0834 X10</em></p> Atika Ulima Zhafira, Rahayu Sulistyorini, Kristianto Usman Copyright (c) 2022 Journal of Engineering and Scientific Research http://jesr.eng.unila.ac.id/index.php/ojs/article/view/96 Tue, 23 Aug 2022 00:00:00 +0000 The Initiation Study on the Gold Potential Resources at West Coast Area in Lampung Province, Indonesia http://jesr.eng.unila.ac.id/index.php/ojs/article/view/97 <p>Gold mineral (Au) is formed due to an increase in the residual solution of magma deposited at high temperature and pressure. This study aims to estimate the potential of gold minerals in the west coast area in Lampung Province. This initiation study was using a geophysical resistivity model. Based on geological data, gold minerals in the West Coast are classified as epithermal hydrothermal deposits in the form of low sulfide quartz veins. The results of the subsurface interpretation were identified as a gold mineralization zone associated with the rock in the form of volcanic rock which has a resistivity value of 400?.m. The source rock volume has been estimated at 130,000 m3 and ?133,000 m3. So that the Au mineral content in the study area is estimated at 0.5-2.09 tons. A future study should be conducted in relation to the development of gold mining industry in Lampung West Coast area, that may integrate more engineering experts.</p> Akroma Hidayatika, Syamsurijal Rasimeng Copyright (c) 2022 Journal of Engineering and Scientific Research http://jesr.eng.unila.ac.id/index.php/ojs/article/view/97 Tue, 23 Aug 2022 00:00:00 +0000