Journal of Engineering and Scientific Research https://jesr.eng.unila.ac.id/index.php/ojs <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, pISSN: 2685-0338; eISSN: 2685-1695. JESR is an International online journal which publishes innovative original research papers and critical review artides in the field of engineering and scientific research. It focuses on but not limited to Chemical and Environmental Engineering, Mechanical and Manufacturing, Industrial Engineering, Computer and Information Technology, Electrical and Telecommunication, Material and Mining, Civil and Geodetic Engineering, Architecture and Urban Planning, Geophysical Science and Engineering, and Interdisciplinary Engineering research, The main criteria for publication are including the originality, scientific quality and interest to the aim and focus. JESR is published by The Faculty of Engineering, University of Lampung, Indonesia twice a year for June and December editions, start from June 2019, JESR 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 online system.</p> </td> </tr> </tbody> </table> en-US misfa@eng.unila.ac.id (JESR - Managing Editor) gigih@eng.unila.ac.id (Gigih Forda Nama) Mon, 28 Dec 2020 00:00:00 +0000 OJS 3.2.1.2 http://blogs.law.harvard.edu/tech/rss 60 Tsunami Modelling Araound Lombok, Indonesia https://jesr.eng.unila.ac.id/index.php/ojs/article/view/58 <p><em>Lombok earthquake in 2018, raised many failure of facilities that impact to human life. The earthquake was unique, started with mainshock that did not predict by scientist with hypocenter located in Flores Fault in the north of Lombok Island. In 1992, tsunami recorded in Lombok with the hypocenter also in Flores Fault. Based on the information, earthquake in Flores Fault can trigger tsunami. Beside Flores Fault, subduction zone in the south of Lombok is also can be earthquake source and it is not impossible can trigger the tsunami. The purpose of this research is to modeled the tsunami both it come from earthquake in Flores Fault and the subduction zone with magnitude 7.8. Numerical method is used to modelled it and the result is the height and velocity of tsunami is 11 m and 720 km/hours for Flores Fault and 9 m and 450 km/hour for subduction Zone.</em></p> Indriati Retno Palupi, Wiji Raharjo Copyright (c) 2021 Journal of Engineering and Scientific Research https://jesr.eng.unila.ac.id/index.php/ojs/article/view/58 Mon, 28 Dec 2020 00:00:00 +0000 Monitoring for Photovoltaic in Outer Island https://jesr.eng.unila.ac.id/index.php/ojs/article/view/59 <p><em>Photovoltaic is a renewable energy source that can optimally be used on outer islands and areas that are difficult to reach by the main electrical system network. With good solar energy intensity on a daily, it adds to the advantages of using photovoltaics. In this regard, it is necessary to make a prototype </em><em>for</em><em> monitoring the photovoltaic output parameters to measure photovoltaic performance. </em><em>The parameters </em><em>that will be</em><em> m</em><em>onitor</em><em>ed</em><em> on 50 W</em><em>p</em><em> photovoltaic used in this research </em><em>are</em><em> voltage using a voltage sensor, current using an ACS712 sensor, and the real power generated. The monitoring results are stored in a database and monitored in realtime based on the website's setting. So that this prototype can be used in several outer islands in Bangka Belitung, which is geographically an archipelago</em></p> W Sunanda, E A Pratama, H Subastiyan, Y Tiandho, D Novitasari Copyright (c) 2021 Journal of Engineering and Scientific Research https://jesr.eng.unila.ac.id/index.php/ojs/article/view/59 Mon, 28 Dec 2020 00:00:00 +0000 Corrosion Analysis of Oil Drilling Pipes On Mobile RIG 42.3 N1500 E In Prabumulih https://jesr.eng.unila.ac.id/index.php/ojs/article/view/47 <p><em>In the oil, gas, and geothermal drilling industry, the use of drill pipe is very important to increase the length of the drilling depth. Problems that are often encountered in drilling pipes such as broken, bent, and leaking drilling pipes, one of which is caused by corrosion. Corrosion is the degradation of materials (usually metals) due to the electrochemical reaction of these materials with their environment. This study uses a specimen of carbon steel pipe type G105 where this pipe is used in field drilling. From the results of research on the corrosion rate test, the corrosion rate value is obtained in mm / month. This study took the first drill pipe sample starting from May 2018 to October 2019 with the same sample code with a sample size of 69 pipes. Based on the research results, the largest corrosion rate value in the drilling pipe from May 2018 to October 2019 is 0.12 mm / month. In the research, the smallest remaining life of the drilling pipe is 6.2 months. Of the 69 drilling pipes studied, there were 11 drilling pipe samples that had decreased quality to class 2. Based on the results of Scanning Electron Microscopy photos, the condition of the pipe surface morphology after corrosion and there was surface damage after corrosion.</em></p> Elfidiah, Kiagus Ahmad Roni, Agustriono Copyright (c) 2021 Journal of Engineering and Scientific Research https://jesr.eng.unila.ac.id/index.php/ojs/article/view/47 Mon, 28 Dec 2020 00:00:00 +0000 GIS-Based Area Suitability Analysis for Development Planning Purposes Campus: Case Study Banyuwangi State Polytechnic https://jesr.eng.unila.ac.id/index.php/ojs/article/view/60 <p><em>In the context of the ecological relationship between humans and the academic environment, success in obtaining high-quality graduations influenced by the quality of the building's space system and other supporting facilities as a place for students to study. So the construction site's design becomes an essential factor to consider in the educational environment.&nbsp; Banyuwangi state polytechnic has not implemented and developed SIG to determine the construction site. Hence, it causes campus spatial planning problems for the future, like puddles, floods, noisy classrooms, and difficult access to each building. Banyuwangi State Polytechnic, as a twelve-year-old college in Banyuwangi, is in desperate need of regional development planning as one of the efforts to ensure the continuity of academic activities that are adequate and comfortable for students. This study aims to ?nd out the area suitability for determining Banyuwangi State Polytechnic development's best location choice. Banyuwangi State Polytechnic, located in the middle of the public road on the east side and the railway in the west to the north, causes noise levels to be a critical issue to consider to achieve a fair learning process. Area suitability assessment is a critical determinant in campus planning development. The suitability assessment is carried out through the AHP (analytical hierarchy process) model covering all land, buildings, noise levels, soil slope, road access, and availability of irrigation channels. The data obtained mapped into the Geographic Information System using Quantum GIS (QGIS) software. Land-use suitability is calculated based on criteria in the form of noise level (NL), land elevation (EL), ease of access (RA), and irrigation channel (ICA). There are 4 points obtained after discussions with the development planning unit management for alternative locations for development sites. The highest weight of the best criteria for determining location is the NL criteria of 0.566 and PSI of 0.283. The best location for development is in the second alternative location with a weight of 0,20176, followed by the third alternative location with a weight of 0,12028.</em></p> Endi Sailul Haq, Farisqi Panduardi Copyright (c) 2021 Journal of Engineering and Scientific Research https://jesr.eng.unila.ac.id/index.php/ojs/article/view/60 Mon, 28 Dec 2020 00:00:00 +0000 Improvement of Hardness of Hydroxyapatite by the Addition of Silica from Tin Tailings https://jesr.eng.unila.ac.id/index.php/ojs/article/view/48 <p><em>The application of bone scaffolding in bone therapy is an alternative solution developed in bone tissue engineering technology to avoid bone donors' scarcity. The main requirement for a material that can be used as a scaffold is that it is biocompatible. Hydroxyapatite is a calcium phosphate ceramic that is often used as the primary material for scaffolding because it has good biocompatibility properties. However, like most ceramics, hydroxyapatite has low mechanical properties. In this study, we synthesized hydroxyapatite from cockleshell waste. To improve hydroxyapatite's mechanical properties (hardness), we added silica from tin tailings to hydroxyapatite. Through the analysis of the x-ray diffraction (XRD) pattern, it was found that hydroxyapatite was successfully synthesized from cockleshell using the co-precipitation method. Analysis of the diffraction pattern of tin tailings also shows that most of the crystals comprising tin tailings sand are silica in the ?-quartz phase. The addition of silica to hydroxyapatite followed by compaction and sintering at a temperature of 800 ? did not produce a new crystal phase. The addition still has a diffraction pattern consisting of a combined XRD pattern of hydroxyapatite and silica. Based on the hardness test using the Vickers hardness method, it is known that the addition of silica can increase the hardness of hydroxyapatite.</em></p> Fitri Afriani, Evi J, Zaitun, Yuant Tiandho Copyright (c) 2021 Journal of Engineering and Scientific Research https://jesr.eng.unila.ac.id/index.php/ojs/article/view/48 Mon, 28 Dec 2020 00:00:00 +0000 Identification of Geothermal Potential with Remote Sensing, Geochemistry, and Magnetotelluric Method in West Sumatera https://jesr.eng.unila.ac.id/index.php/ojs/article/view/61 <p>West Sumatra is one of a geothermal potential in Indonesia because of interaction between Eurasian and Indo-Australian tectonic. The existence of volcanoes produces geothermal potential with lithology andesite, tuff, and lapilli lava in the Marapi Mountain complex, which elongated at NW-SE direction as a result of NE-SW subduction. The remote sensing method specifically with Composite Band 567 and Lineament Density Analysis (LDA) found anomaly with the permeability value of prospects ranged from 2.05 to 4.76% per km<sup>2</sup> (highest density value) with general direction is in the southeast-northwest which in line with the Sumatra structural pattern. &nbsp;Based on geological data, argillic alteration was found with geothermal manifestations consisting of hot springs. Through geochemical analysis, the fluid type of hot water sample (temperature of 48.66<sup>o</sup>C) is in the immature water zone; occur with the presence of carbonate sinter. Geophysical analysis using the magnetotelluric (MT) method to identified geothermal systems such as cap rock with low resistivity (&lt;30 ohm.m) and reservoirs with moderate resistivity (31-300 ohm.m). The correlation between remote sensing, geochemistry, and magnetotelluric could determine the geothermal potential in West Sumatra.</p> S S Larasati, I Maratama, P W Laksmana, O D Puspita, I Takodama Copyright (c) 2021 Journal of Engineering and Scientific Research https://jesr.eng.unila.ac.id/index.php/ojs/article/view/61 Mon, 28 Dec 2020 00:00:00 +0000 The Rheological Characteristics of Dammar Mata Kuching https://jesr.eng.unila.ac.id/index.php/ojs/article/view/50 <p><em>Rheology is </em><em>already</em><em> defined as the science of flow and deformation of matter.</em> <em>The </em><em>purpose</em><em> of rheology is to look at the relationships between stress and deformation of the material-marterial (non-Newtonian) in order to explain its mechanical properties.</em> <em>One of the ingredients that is often used as a basic material for making products is </em><em>dammar</em><em>.</em> <em>Dammar</em><em> is a general term used to name a material in the form of natural resin which is the result of exudation of trees from the Dipterocarpaceae and Burseraccae families.</em> <em>This </em><em>research</em><em> uses raw materials </em><em>dammar</em><em> and toluene which are used to make a solution of </em><em>dammar</em><em> with the proportion of </em><em>dammar</em><em>: toluene, namely 50: 50, 40: 60, 35: 65, and 30: 70.</em> <em>Then the rheological analysis is analyzed by measuring the viscosity value, the shear rate. , and also its shear stress. The viscosity value increases with the greater the shear rate and the value of n (Flow Behavior index) is&gt; 1, indicating that a solution of resin is a fluid with a type of dilatan fluid.</em></p> <p><em>&nbsp;</em></p> <p><strong><em>Keywords: dammar, deformation, rheology, shear rate, shear stress.</em></strong></p> Chairul Umam, Azhar, Elida Purba Copyright (c) 2021 Journal of Engineering and Scientific Research https://jesr.eng.unila.ac.id/index.php/ojs/article/view/50 Mon, 28 Dec 2020 00:00:00 +0000 Simulation and Modeling Time Response of Double Carrier Avalanche Photodiodes https://jesr.eng.unila.ac.id/index.php/ojs/article/view/45 <p><em>Avalanche photodiodes (APDs) is a particularly sensitive semiconductor device that employs the photoelectric effect to convert light into electricity. APDs can be used in some typical applications, i.e. imaging, optical fiber communications, range finding, laser scanners and laser microscopy. In APDs</em>,<em> avalanche multiplication occurred due to impact ionization when the devices operating at high electric fields. Unfortunately, avalanche multiplication decreases the time response of APDs. The time response of an APD can be characterized by its current response which is represented by the mean current as a function of time. This paper discusses </em><em>a method to estimate the time response of double-carrier multiplication avalanche photodiodes (APDs). The model, called The Random Path Length (RPL), generates random path length for a carrier to impact ionize and takes account of dead space distance into the calculation. Dead space distance is the minimum distance to travel by a carrier to gain the adequate energy to start first ionization. The RPL is applied into an ideal structure which is assumed has a dimensionless multiplication length, w = 1.0, with electrons and holes moving in constant speeds, v<sub>e</sub> = v<sub>h</sub> = v, for various dead spaces distances, d*. In this research, a computer code is generated to compute the mean impulse response, i(t), and the standard deviation, s(t), of APDs all as a function of time.</em></p> Helmy Fitriawan Copyright (c) 2021 Journal of Engineering and Scientific Research https://jesr.eng.unila.ac.id/index.php/ojs/article/view/45 Mon, 28 Dec 2020 00:00:00 +0000 Distributed Control with Web-based 3D Visualization using Kinematics Analysis for IoRT https://jesr.eng.unila.ac.id/index.php/ojs/article/view/62 <p><em>The use of graphical user interface in web platform has been increasing in the recent decades. The concept of Internet of Robotic Things (IoRT) integrates heterogenous intelligent devices into a distributed architecture of platforms. This research is conducted to deliver proof of concept of distributed control of 2 DOF robot manipulator with web-based 3D visualization. The 3D modeling was developed using Three.js and the WebGL library. Synchronization was made using WebSocket communication on TCP network layer. This protocol allowed 3D mesh data broadcasted from web interface to manipulator with average response 7.86 ms. Moreover, using Denavit-Hartenberg convention, kinematic model facilitates the convention of end-effector position data into angular form and vice versa. The error percentage at a joint 1 is 4% and joint 2 of 2.96%. The error occurs because of the characteristic of inverse function called singularity in which the application value in each joint has the input values of and respectively to get the end-effector position on the 2 DoF Manipulator Robot.</em></p> Z Iklima, T M Kadarina Copyright (c) 2021 Journal of Engineering and Scientific Research https://jesr.eng.unila.ac.id/index.php/ojs/article/view/62 Mon, 28 Dec 2020 00:00:00 +0000 Electric Field Waveforms of Very Close Negative Cloud to Ground Flashes https://jesr.eng.unila.ac.id/index.php/ojs/article/view/68 <p><em>Negative cloud-to-ground brings down negative charge from cloud to ground. In this paper, observations of the characteristics of fast and slow electric field within reversal distance (less than 7-8 km from lightning sensor) are reported. A total of four negative cloud to ground</em> <em>lashes detected very close to our measurement site in Universiti Teknikal Malaysia Melaka on 12<sup>th</sup> November 2019 were selected for analysis. The captured waveforms are compared with the location data provided by Tenaga Nasional Berhad Research (TNBR) for validation purposes. It can be observed that electric field changes of stepped leader and return stroke are always positive whether beyond or within reversal distance. Meanwhile, for cloud activities, the electric field change is always negative within reversal distance.</em></p> Shamsul Ammar Shamsul Baharin, Mohd Riduan Ahmad Copyright (c) 2020 Journal of Engineering and Scientific Research https://jesr.eng.unila.ac.id/index.php/ojs/article/view/68 Mon, 28 Dec 2020 00:00:00 +0000