Jurnal Teknik https://jt.ft.ung.ac.id/index.php/jt <p>Jurnal Teknik&nbsp; is a peer-reviewed journal published by State University of Gorontalo. Jurnal Teknik is published two times annually, in June and December. Jurnal Teknik provides a place for academics, researchers, and practitioners to publish scientific articles. The scope of the articles listed in this journal is related to various topics such as Civil Engineering, Electrical Engineering, Informatics Engineering, Craft Engineering, Architecture, Industrial Engineering, Mechanical Engineering, Engineering Education, and other related engineering fields.</p> <p>All manuscripts sent to the Jurnal Teknik editor are accepted in Bahasa Indonesia or English. Since 2019, Open Journal Systems (OJS) has been applied for all business process in Jurnal Teknik. Therefore, authors are required to register in advance and to upload the manuscript online. The manuscript progress could be monitored through OJS. Authors, readers, editorial board, editors, and peer review could obtain the real-time status of the manuscript.</p> <p>Please read these journal guidelines and template carefully. Authors who would like to submit their manuscript should obey the writing guidelines. If the manuscript submitted is not in accordance with the guidelines or is written in a different format, it will <strong>BE REJECTED</strong> by the editors before being reviewed. The editors will only accept manuscripts which meet the assigned format.</p> Universitas Negeri Gorontalo en-US Jurnal Teknik 1693-6191 Pengaruh Keberadaan Bandar Udara Kelas III Seko Luwu Utara Terhadap Index Pencemaran Air https://jt.ft.ung.ac.id/index.php/jt/article/view/58 <p style="text-align: justify;">The airport is one of the best transportation systems capable of moving people quickly as fast economic growth is followed by rapid population growth. Also, rapid population growth leads to massive exploitation of natural resources which causes environmental degradation such as illegal logging. Seko Airport, located in North Luwu is indicated to have caused environmental pollution, especially in watersheds. Therefore, this study aims to identify water pollution through physical and chemical parameters. Data were analyzed using the pollution index method to find the index value. The results showed that the waters around Seko Airport had an index value of 0.78 which was categorized as not polluted. This happens because the airport has a good water treatment system. Besides, there are strict regulations and guidance for all visitors and the local community to not throw rubbish into water bodies.</p> M.Ichsan Ali Muh. Rais Abidin Copyright (c) 2020 M.Ichsan Ali, Muh. Rais Abidin (Author) https://creativecommons.org/licenses/by-sa/4.0 2020-06-01 2020-06-01 18 1 1 6 10.37031/jt.v18i1.58 Rancang Bangun Inverter Mini 1.5 Vdc to 220 Vac Untuk Lampu Darurat https://jt.ft.ung.ac.id/index.php/jt/article/view/65 <p style="text-align: justify;">Used cellphone charger components are used as an alternative to create emergency lights which can later be used by the community when the power source from the grid goes out. The purpose of this study is to utilize the components of a used cellphone charger which is the Joule Thief transformer to create 1.5 Vdc to 220V ac mini inverter. The method used in this study is the experimental method, which starts from the selection of tools and materials to measuring the outputs. The results showed that the design of a 1.5 Vdc to 220 Vac mini inverter with Joule Thief can turn on 220 Vac LED lights without drivers. Tests were carried out on 1 watt driverless 220 Vac LED lights. Experiments were carried out to test the dc source durability in the form of 1.5 Vac battery. From testing for LED lights 1, 2 and 3 it turns out that the current and voltage gradually decreased due to the use of LED lights. The resources quickly ran out when the inverter was used for 3 LED lights. The design of tools can be used as an emergency light when the source of electricity from the grid.</p> Syahrir Abdussamad Copyright (c) 2020 Syahrir Abdussamad (Author) https://creativecommons.org/licenses/by-sa/4.0 2020-06-05 2020-06-05 18 1 7 16 10.37031/jt.v18i1.65 Analisis Beban Kerja Mental Pada Mekanik Menggunakan Metode SWAT dan Metode QNBM https://jt.ft.ung.ac.id/index.php/jt/article/view/61 <p>Mental workload is the difference between the demands of a task workload with the maximum capacity of a person's mental capability in a motivated state. The purpose of this study was to determine the level of the mental burden of mechanics using the SWAT and QNBM methods. The results of the Subjective Workload Assessment Technique method for heavy service workload showed that the mechanics were 56.6% burdened. Mental workload dimensions for mechanics 1 and 3 are effort load, for mechanic 2 is time load. The category for light service is 11.11%, unburdened in the time load dimension for all mechanics. Nordic Body Map Questionnaire Method was 67%, with illness category included.</p> Yolanda Lapai Idham Halid Lahay Fentje Abdul Rauf Copyright (c) 2020 Yolanda Lapai, Idham Halid Lahay, Fentje Abdul Rauf (Author) https://creativecommons.org/licenses/by-sa/4.0 2020-06-06 2020-06-06 18 1 17 22 10.37031/jt.v18i1.61 Komparasi Performa Insulasi Termal Antara Dinding Batu Bata dan Batu Bata dengan Penambahan Insulasi Alang-Alang https://jt.ft.ung.ac.id/index.php/jt/article/view/60 <p>Buildings consume about 40% of the world's energy, beginning from the process of making the building itself to how the building could meet human thermal comfort needs. In the past, reeds were often used in traditional buildings, but unfortunately these days the practice is being abandoned. Several studies have shown that weeds can reduce building temperatures. However, these studies research has not examined how reeds are used as insulation material along with bricks so the purpose of this study is to compare the thermal insulation performance between plain brick and brick wall with the addition of reed insulation. The method used in this research is to use Ecotect simulation. Based on the results of simulations carried out it is known that model 1, namely the plain brick wall, has an outside-inside temperature difference of -1.32917 ° C. This means that the average temperature inside is hotter than the outside temperature by 1.32917 ° C. Meanwhile in model 2, the brick wall with the addition of reeds insulation has an outside-inside temperature difference of 0.445833 ° C. This means that the average temperature inside is cooler than the outside temperature by 0.445833 ° C. Therefore, it can be concluded that reeds could be used as thermal insulation material because it could store heat better than the material in Model 1, which is a plain brick wall.</p> Niniek Pratiwi Baharuddin Hamzah Rosady Mulyadi Copyright (c) 2020 Niniek Pratiwi, Baharuddin Hamzah, Rosady Mulyadi (Author) https://creativecommons.org/licenses/by-sa/4.0 2020-06-06 2020-06-06 18 1 23 34 10.37031/jt.v18i1.60 Monitor Kualitas Udara Berbasis Web Menggunakan Raspberry Pi dan Modul Wemos D1 https://jt.ft.ung.ac.id/index.php/jt/article/view/57 <p>Air pollutant is a physical, chemical, and biological substance that can endanger the health and can cause disease in living beings. Therefore, knowledge about air quality is very important. This research aims to implement a wireless sensor network for monitoring air quality, from three different location points which are presented in the form of a website. The communication used between the client and server is the Webscoket.io communication protocol, to reduce network latency. In addition, the communication protocol works in real-time because not only the client can send a request to the server, but also can receive a response without having to send a request first. The research method used is the experimental method, which is divided into two stages namely hardware design stage and server software, microcontroller and user client design stage. The results obtained are prototyping tools used to implement wireless sensor networks for monitoring air quality using Raspberry Pi as a server and Arduino ESP-8266 as a microcontroller module. The tools have performed well as intended. In the trial, a reading of gas (CO2 and CO) sensors, temperature and humidity at the location being tested were successfully displayed on the website.</p> Frenki Tahir Wrastawa Ridwan Iskandar Zulkarnain Nasibu Copyright (c) 2020 Wrastawa Ridwan, Frenki Tahir, Iskandar Zulkarnain Nasibu (Author) https://creativecommons.org/licenses/by-sa/4.0 2020-06-06 2020-06-06 18 1 35 44 10.37031/jt.v18i1.57 Observasi Gaya Kepemimpinan Terhadap Kinerja Pekerja Pada Proyek Preservasi Rekonstruksi Jalan Surabaya-Gresik-Sadang https://jt.ft.ung.ac.id/index.php/jt/article/view/67 <p>Leadership style within the company or in the project location greatly influences the work progress. The use of improper leadership style would influence the execution of the project, which would have a negative impact on the success of the project. This study aims to determine the influence of leadership style by using several indicators of leadership style, namely traits, temperament, habits, character and personality. The analytical method used in this study is the validity test, reliability test, determination test (R) and t-test. The data was obtained using questionnaires distributed at the research location. The results of the study indicated that the validity test and the reliability test was shown to be valid and reliable, an error rate of 95% or 0.05 resulted in the determination test results, which produced 88% of the variable variation in employee performance which can be explained by leadership style variables. While the t-test yielded the results of X1 = 2,71, X2 = 3,230, X3 = 4,278, X4 = 7,217 and X5 = 3,253, all of which are significant. Based on the results of the test, it can be interpreted that the leadership style has a significant and positive influence on performance.</p> Totok Dwi Sutanto Sugeng Dwi Hartantyo Copyright (c) 2020 Totok Dwi Sutanto, Sugeng Dwi Hartantyo (Author) https://creativecommons.org/licenses/by-sa/4.0 2020-06-30 2020-06-30 18 1 45 51 10.37031/jt.v18i1.67 Studi Kelayakan Investasi Perumahan Menggunakan Metode Benefit Cost Ratio https://jt.ft.ung.ac.id/index.php/jt/article/view/68 <p>Investment is the association of a financial source in a long period to generate profits in the future/future. Housing is a group of houses that are either narrow or broad that functions as a residential or residential environment for the people who occupy it. The problem statement is to find out whether the house type 30/60 in the Lamongan Regency Insani housing is worth investing in when viewed from a financial perspective. The purpose of this study was to determine the feasibility of Insani Regency Lamongan housing investment. The method used to analyze the investment feasibility is the Benefit-Cost Ratio. Based on the results of this research, the Lamongan Regency Insani Housing showed that it was feasible because it produced a Benefit-Cost Ratio of 1,307.</p> Imam Sururi Hammam Rofiqi Agustapraja Copyright (c) 2020 Imam Sururi, Hammam Rofiqi Agustapraja (Author) https://creativecommons.org/licenses/by-sa/4.0 2020-06-30 2020-06-30 18 1 52 61 10.37031/jt.v18i1.68