Jurnal VORTEKS https://jurnal.alazhar-university.ac.id/index.php/vorteks <p>ISSN: <a title="ISSN cetak" href="http://issn.pdii.lipi.go.id/issn.cgi?daftar&amp;1603455655&amp;1&amp;&amp;" target="_blank" rel="noopener"><span class="fontstyle0">2746-9778 </span><span class="fontstyle2">(media cetak)</span></a>| ISSN: <a title="ISSN Online" href="http://issn.pdii.lipi.go.id/issn.cgi?daftar&amp;1603453399&amp;1&amp;&amp;" target="_blank" rel="noopener"><span class="fontstyle0">2746-976X </span><span class="fontstyle2">(media online)</span></a><br /><br />Jurnal Vorteks dipublikasikan oleh Program Studi Teknik Mesin Universitas Al Azhar Medan. Artikel/karya ilmiah yang akan dimuat pada jurnal ini adalah Artikel/karya ilmiah yang berkaitan di bidang Sistem Teknik meliputi bidang Konversi Energi, Perancangan Mekanik dan Manajemen Proyek, proses Manufaktur, Material dan Sistem Produksi, Konstruksi Jalan Raya dan Air, Energi Terbarukan, Mekatronika. Jurnal ini diterbitkan 2 (dua) kali dalam satu tahun yaitu bulan Oktober dan April.</p> en-US jurnalvorteks@gmail.com (Zufri Hasrudy Siregar, S.T.,M.Eng) jurnalvorteks@gmail.com (Zufri Hasrudy Siregar, S.T.,M.Eng) Sun, 12 Jan 2025 14:00:19 +0700 OJS 3.3.0.13 http://blogs.law.harvard.edu/tech/rss 60 The Effect of fuel mixture composition on gasoline engine emissions in urban conditions https://jurnal.alazhar-university.ac.id/index.php/vorteks/article/view/389 <p>The increasing number of motorized vehicles in urban areas significantly impacts air quality and public health. Gasoline engine emissions, including CO, HC, and NOx, contribute to pollution issues such as volatile organic compounds (VOCs) and secondary organic aerosols (SOAs). Understanding these factors is crucial for developing effective emission control strategies. This study investigates the effect of ethanol-blended gasoline on vehicular emissions, focusing on CO, HC, and NOx. The research aims to optimize fuel mixtures to reduce harmful emissions while considering environmental and health impacts. The study uses a quantitative experimental design, combining laboratory tests with field trials on 10 vehicles under controlled conditions. Results show that ethanol-blended fuels significantly reduced CO emissions, from 2.4 g/km (E0) to 1.5 g/km (E30). A moderate reduction was observed in HC emissions, from 0.55 g/km (E0) to 0.40 g/km (E30). A slight decrease in NOx emissions was noted. Ethanol's oxygen content improves combustion efficiency, reducing CO and HC emissions, but may slightly increase NOx due to combustion temperature changes. This study highlights the potential of ethanol as an environmentally friendly fuel alternative, with further research needed to address NOx-related challenges</p> Zufri Hasrudy Siregar, Arif Fadillah Nasution, Muhammad Fazri, Refiza Refiza, Riana Puspita, Husni Thamrin, Asmara Sari Nasution Copyright (c) 2025 Zufri Hasrudy Siregar, Arif Fadillah Nasution, Muhammad Fazri, Refiza Refiza, Riana Puspita, Husni Thamrin, Asmara Sari Nasution https://creativecommons.org/licenses/by/4.0 https://jurnal.alazhar-university.ac.id/index.php/vorteks/article/view/389 Wed, 30 Oct 2024 00:00:00 +0700 Soil investigation dutch penetration test implementation of North Sumatra Polda Flat Houses https://jurnal.alazhar-university.ac.id/index.php/vorteks/article/view/390 <p>From the results of drilling tests with machine drills, standard penetration tests (SPT), and DCPT or sondir tests, several conclusions can be taken as follows: 1). The results of boring tests show that the soil layer has medium soil consistency at a depth of 0 - 9.85 meters with NSPT value 10 – 30. 2). The soil layer consists of sandy clay, fine sand pumice stone, and fine sand. 3). Test results for the depth of solid soil at a depth of 18.6 – 19.00 meters. 4. The cone tip resistance at point S-01 is 200 kg/cm2 and S-02 is 173 kg/cm2 5). Calculation of the vertical Bearing&nbsp; Capacity (Qi) of the pile foundation from SPT data using a safety factor for tip penetration resistance = 3, for sticky resistance used&nbsp; = 5. 6). For large construction loads using deep foundations, it is necessary to check to a depth of &gt; 10 meters or attain&nbsp; NSPT 60 in a row 3 times</p> Diana Suita, Johan Oberlyn Simanjuntak, Muhammad Yusuf Parlagutan Lubis, Simon Petrus Simorangkir Copyright (c) 2025 Diana Suita, Johan Oberlyn Simanjuntak, Muhammad Yusuf Parlagutan Lubis, Simon Petrus Simorangkir https://creativecommons.org/licenses/by/4.0 https://jurnal.alazhar-university.ac.id/index.php/vorteks/article/view/390 Wed, 30 Oct 2024 00:00:00 +0700