http://jesr.eng.unila.ac.id/index.php/ojs/issue/feedJournal of Engineering and Scientific Research2024-02-13T05:03:07+00:00JESR - Managing Editormisfa@eng.unila.ac.idOpen Journal Systems<p style="text-align: justify;"><strong>Journal of Engineering and Scientific Research (JESR)</strong> is initiated and persistently managed by a group of lecturers from interdisciplinary field in the Engineering Faculty, <strong>Universitas Lampung</strong>. 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. 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. <a href="http://incestmovie.com/">incest movie</a></p> <p style="text-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 decree <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"><strong><span style="color: windowtext; text-decoration: none; text-underline: none;">No. 105/E/KPT/2022</span></strong>.</a></p> <div id="customblock-indexing" class="pkp_block block_custom"> <h2 class="title"><span style="text-decoration: underline;">JESR Journal <span style="font-weight: normal;">Has Been Indexed In:</span></span></h2> <p><a href="https://sinta.kemdikbud.go.id/journals/profile/8868"><img src="http://jesr.eng.unila.ac.id/public/site/images/adminjesr/screen-shot-2019-09-16-at-23.11-.09-.png" alt="" width="136" height="47" /> </a> <a href="https://journals.indexcopernicus.com/search/details?id=52619"><img src="http://jesr.eng.unila.ac.id/public/site/images/adminjesr/ici2.png" alt="" width="226" height="52" /></a> <a href="https://www.base-search.net/Search/Results?q=dccoll:ftjesr&refid=dcrecen"><img src="http://jesr.eng.unila.ac.id/public/site/images/adminjesr/logo-224x57-transp.gif" alt="" width="224" height="57" /></a> <a href="https://garuda.kemdikbud.go.id/journal/view/16167"><img src="http://jesr.eng.unila.ac.id/public/site/images/adminjesr/screen-shot-2019-09-16-at-23.14-.41-.png" alt="" width="128" height="92" /></a> <a href="https://app.dimensions.ai/discover/publication?search_text=10.23960%2Fjesr&search_type=kws&search_field=doi&search_mode=content"><img src="http://jesr.eng.unila.ac.id/public/site/images/adminjesr/dimensions-new-colour-01-121.png" alt="" width="160" height="28" /></a> <a href="https://scholar.google.com/citations?hl=en&user=Uh58GYwAAAAJ"><img src="http://jesr.eng.unila.ac.id/public/site/images/adminjesr/screen-shot-2019-09-16-at-23.20-.02-.png" alt="" width="134" height="59" /></a> <a href="https://search.crossref.org/?q=JESR+%3A+Journal+of+Engineering+and+Scientific+Research&from_ui=yes"><img src="http://jesr.eng.unila.ac.id/public/site/images/adminjesr/screen-shot-2019-09-16-at-23.22-.50-.png" alt="" width="133" height="63" /></a> <a href="https://www.worldcat.org/search?q=n2%3A2685-0338&qt=advanced&dblist=638"><img src="http://jesr.eng.unila.ac.id/public/site/images/adminjesr/worldcat1.png" alt="" width="150" height="52" /></a> <a href="https://onesearch.id/Search/Results?filter[]=repoId:IOS8001"><img src="http://jesr.eng.unila.ac.id/public/site/images/adminjesr/logo-ios-perpusnas-109a1eb934---copy.jpg" alt="" width="42" height="60" /></a></p> </div>http://jesr.eng.unila.ac.id/index.php/ojs/article/view/140CONTROL DRIP RATE OF INTRAVENOUS FLUIDS BASED ON HEART RATE WITH A MONITORING SYSTEM USING THINGSPEAK WEBSITE2024-02-06T04:12:12+00:00Raja Hafizh Salamrajahafizhs99@gmail.com<p><em>Dehydration is a state of decreasing the amount of fluid in the body accompanied by increased heart rate. One of the treatments that must be done for dehydrated patients is to give infusions periodically, which must be supervised by medical personnel. However, controlling patient intravenous fluid drops in some hospitals or public health centres is still done manually. Based on this problem, a device can adjust the drip rate of intravenous fluids based on heart rate. This research made a prototype of controlling the drip rate of intravenous fluid based on heart rate using NodeMCU ESP8266 microcontroller, MAX30100 sensor for heart rate reading, optocoupler sensor for drip rate reading, and servo motor for roller clamp drive. From the test results, the system has been able to control the drip rate of infusion based on heart rate with a range of (80 – 89) bpm which has the number of infusion droplets (24 – 35) TPM and a range (90 – 99) bpm that has the number of drip infusions (36 – 47) TPM, then send the heart rate data and drip rate of the injection to the thing speak website every 15 seconds. Heart rate readings with MAX30100 sensors have an error of 2.51% and an accuracy of 97.49%. Meanwhile, the drip rate reading with the optocoupler sensor has an error of 0.83% and an accuracy of 99.17%.</em></p>2023-12-31T00:00:00+00:00Copyright (c) 2023 Journal of Engineering and Scientific Researchhttp://jesr.eng.unila.ac.id/index.php/ojs/article/view/149Landslide Potential Zone Identification Using Electrical Resistivity Tomography Modeling2023-10-26T07:53:05+00:00Muhammad Budzar Alghifarrybudzar@gmail.comOrdas Dewantoordas.dewanto@eng.unila.ac.idRahmat Catur Wiboworahmat.caturwibowo@eng.unila.ac.id<p>The Pidada area, Panjang sub-district, Bandar Lampung City, is located on the physiography of Bukit Barisan and is also influenced by the movement of the Sumatran fault and the Lampung-Panjang fault, so the morphological condition is hilly with steep slopes which cause natural disasters such as landslides. In this study, the knowledge of subsurface rock lithology and slip-slide-prone zones was carried out using the Wenner-Schlumberger geoelectric method. Based on the Wenner-Schlumberger configuration, the top layer consists of weathered rock associated with clay tuff and sandy tuff with a resistivity of 7.2 ?m - 135 ?m. Coarse-grained tuff and fine-grained tuff with resistivity values ??of 135 ?m - 437 ?m, and the third layer combines breccia and igneous rock from the Tarahan Formation with resistivity values ??of more than 437 ?m. The clay sand layer acts as a slip plane. The type of landslide developed in the research area is a crawling soil landslide.</p>2023-12-29T00:00:00+00:00Copyright (c) 2023 Journal of Engineering and Scientific Researchhttp://jesr.eng.unila.ac.id/index.php/ojs/article/view/144Analysis of Losses Due to Load Unbalance in a 2000 kVA Transformer at Supermall Mansion 2 Tower Tanglin Surabaya2024-02-06T04:55:51+00:00Reza Sarwo Widagdorezaswidagdo@untag-sby.ac.idAris Heri Andriawanaris_po@untag-sby.ac.id<p><em>The load unbalance causes a neutral current, the current flowing in the neutral conductor will cause an increase in losses in the transformer. The greater the losses incurred, the efficiency and reliability of the transformer will decrease. Based on this, a study was conducted on analyzing the losses on distribution transformers at Supermall Mansion 2 Tower Tanglin which aims to determine the percentage value of transformer loading, the value of transformer imbalance, the value of transformer losses, and the value of transformer efficiency. This is done so that the value of the installed transformer does not exceed the applicable SPLN value. During the measurement, it was found that the percentage value of the transformer loading was 38.88% during the daytime and 48.89% at night (maximum SPLN 80%, minimum 40%). The load unbalance value is 11.66% during the daytime and 10.33% at night (SPLN is categorized as good if < 10%). Copper losses (Pcu) are 91.3 kW during the daytime and 94.2 kW at night. The value of losses due to neutral currents is 0.134 kW with a percentage of 0.0071% during the daytime and 0.173 kW with a percentage of 0.0090% at night. The percentage of the current value in the neutral conductor is 26.36% during the day and 24.04% at night (SPLN is categorized as good if < 20%).</em></p>2023-12-31T00:00:00+00:00Copyright (c) 2023 Journal of Engineering and Scientific Researchhttp://jesr.eng.unila.ac.id/index.php/ojs/article/view/139Sustainable Drainage System Analysis In The Institut Teknologi Sumatera (ITERA)2024-02-06T05:03:49+00:00firdaus dausfirdaus.abis@gmail.com<p><em>The Institut Teknologi Sumatera is a new university that still requires planning and infrastructure development, one of the development needed is the construction of a drainage system, namely a sustainable drainage system that adheres to the concept of water conservation. The purpose of this research is to analyze topographic conditions, as well as the performance of the existing drainage system in ITERA and to develop recommendations for a sustainable drainage system. In this study, several stages were carried out, first analyzing the topographical conditions in ITERA. The second is to analyze the existing drainage capacity, which is to compare the existing drainage capacity to the runoff that occurs when it rains. The calculation of runoff discharge is obtained from hydrological analysis of rainfall data using the annual maximum partial series method. Third, synthesizing the connectivity between drainage segments to the reservoirs in ITERA.</em></p> <p><em> </em></p> <p><em>The results of several analyzes above show that, firstly, the topography in ITERA is relatively flat with the most dominant elevations being 85 - 100 m and 100 - 105 m. Second, the calculation results show that the existing drainage capacity is still able to accommodate the runoff that occurs. So for now it is still safe against inundation and flooding. Third, the results show that there are several existing drainages that have not been connected to other drainage segments and water does not run off to the designated place as a reservoir, namely the reservoir.</em></p> <p><em> </em></p> <p> </p>2023-12-31T00:00:00+00:00Copyright (c) 2023 Journal of Engineering and Scientific Researchhttp://jesr.eng.unila.ac.id/index.php/ojs/article/view/145A Influence of Reservoir Water Level Fluctuations of Reservoir B (Rusunawa) on Groundwater Availability at the Environment of Lampung University2024-02-06T05:14:48+00:00Erwanto Erwantoerwan2000.rajabasa@gmail.com<p><em>The presence of four reservoirs as rainwater collection infrastructure at the University of Lampung is expected to enhance the infiltration process and recharge the groundwater aquifers. However, the threat of water scarcity in the area may arise due to the reduction of recharge areas. Therefore, a comprehensive study is necessary to understand the important factors in maintaining groundwater availability. This research aims to analyze groundwater aquifers, identify fluctuations in the water level of Reservoir B, and analyze the relationship between the elevation of the water level in the reservoir and the availability of groundwater in the University of Lampung environment. The research methodology involves the interpretation of geoelectric data and the calculation of water level fluctuations in the reservoir. The analysis results indicate that the shallow groundwater aquifer is estimated to be located at depths ranging from 10 to 30 meters, while the deeper aquifer is situated at depths of 80 to 130 meters with a layer of sandy tuff. The highest fluctuation in water level is recorded at 14 cm during rainfall with an intensity of 52.1 mm/day. There were no significant changes in the water level observed during rainfall with intensities ranging from 0 to 2.4 mm/day, and the average fluctuation observed is approximately 0.5 cm every 8 hours</em>.</p>2023-12-31T00:00:00+00:00Copyright (c) 2023 Journal of Engineering and Scientific Researchhttp://jesr.eng.unila.ac.id/index.php/ojs/article/view/147BLDC Motor Stability Management Using Adaptive PID (MRAC-PID) 2024-02-13T05:03:07+00:00Zahwa Dinda Auliazahwadindaaulia72@gmail.com<p><em>BLDC motors have become popular in various industries such as automotive, consumer, healthcare, industrial automation, and instrumentation due to their optimal performance. To keep the BLDC motor in optimal condition, a control engineering system is required that serves as a controller. A single Proportional Integral Derivative (PID) control system is only suitable for linear conditions, so it cannot produce satisfactory output when there is a change in set point. To overcome this obstacle, an adaptive PID control system known as MRAC-PID control system is applied, which is able to control the stability of the BLDC motor as desired. Testing of this system is done under 4 different conditions using MATLAB software. After testing, the parameter values for the MRAC control system were obtained, namely </em><em>????????</em><em> = 0.4; </em><em>????????</em><em> = 50.75; </em><em>????????</em><em> = 0.0000867. Based on the test, the MRAC control system produces a system success rate of 81.2% to 98.9%.</em></p>2023-12-31T00:00:00+00:00Copyright (c) 2023 Journal of Engineering and Scientific Researchhttp://jesr.eng.unila.ac.id/index.php/ojs/article/view/148The Effect of Sodium Hydroxide Concentration on Physical and Mechanical Properties of Magnesium AZ31 Coating for Biodegradable Bone Implant Application 2024-02-06T04:30:28+00:00Sugiyanto Sugiyantoirza.backup@gmail.comRizal N Safiirnsafii@gmail.comMahruri Arif Wicaksonomarifw@gmail.comDwi Gustionodgustiono123@gmail.comIrza Sukmanairza.sukmana@gmail.com<p><em>Anodizing is a metal coating technique by converting a metal surface to form an oxide layer by electrolysis, one of which is to increase the hardness of a material. This research was carried out to know the effect of variations in electrolyte solution on the hardness of the coating resulting from the anodizing process. The electrolyte used is a solution of NaOH (Sodium Hydroxide) with a concentration of 1 M solution of 68% purity. The specimen used is magnesium AZ31, voltage 10 Volts, soaking time 10 minutes at room temperature. Based on the data analysis results, the magnesium layer's hardness value at 10 minutes at a voltage of 10 volts is 69 HV.In comparison, the coating thickness result at 10 minutes with a constant voltage of 10 volts is 6 </em><em>?m</em><em>. While the concentration of the solution is 0.5 M, the purity is 68%. The specimen used is magnesium AZ31, voltage 10 Volts, soaking time 10 minutes at room temperature. Based on the results of data analysis, the hardness value of the magnesium layer at 10 minutes at a voltage of 10 volts is 67 HV. In comparison, the coating thickness at a time of 10 minutes with a constant voltage of 10 volts is 4 </em><em>?m</em><em>. With variations in stress and time in different concentrations of the solution, there will be differences in the hardness value and thickness value of the AZ31 magnesium coating material.</em></p>2023-12-31T00:00:00+00:00Copyright (c) 2023 Journal of Engineering and Scientific Researchhttp://jesr.eng.unila.ac.id/index.php/ojs/article/view/150Effect of nira (Arenga pinnata Merr) tapping tools on the abudance and identification of microorganisms2024-02-06T07:38:57+00:00NINA TURNIPnina21turnip@gmail.com<p><em>Arenga trees are known to have economic value, especially its water, called nira. Nira contains sucrose with a neutral pH at the start of tapping, but after 4 hours, the quality of nira will decrease. This is due to the influence of air (aerobic), so that the presence of microbes in nira becomes abundant and causes the fermentation process to take place more quickly. The fermented nira is known as ‘tuak’, the traditional drink of Bataknese people. Batak people believe the benefits of drinking tuak for health. In this study, nira was collected using a simple tapping device (APUS) with the aim of minimizing contact between surrounding air and bunches. APUS was applied to Arenga bunches in Samosir. Nira from tapping with and without APUS will be observed for microbial abundance (its density). Furthermore, the microbes contained in nira will be identified based on their morphological characters (physically). Identification aims to determine the types of microbes that are present from a natural habitat. Next, the microbes are isolated and studied for their shape and properties, before the microbes are utilized further. The results of microscopic observations showed that the nira sample tapped without using APUS (sample A) had a higher and more turbid microbial density and showed non-uniform microbial size (from large to small, like powder), while nira sample tapped with APUS (sample B) showed almost uniform microbial size with cleaner looking spots. Furthermore, the microbes in sample B were isolated on specific media. Acquisition of colonies in the form of acetic acid bacteria (BAA), lactic acid bacteria (BAL), and yeast. BAA isolates showed a group of gram-negative bacteria that could not retain the crystal violet stain when rinsed with alcohol, because the peptidoglycan in gram-negative bacteria was thinner than gram-positive ones, while BAL isolates were the opposite. The measurement of the number of colonies was carried out using the TPC (Total Plate Count) method at 6 dilutions and obtained for BAL and yeast were 147 and 30 colonies respectively.</em></p>2023-12-31T00:00:00+00:00Copyright (c) 2023 Journal of Engineering and Scientific Research