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All Journal INVOTEK: Jurnal Inovasi Vokasional dan Teknologi Justek : Jurnal Sains Dan Teknologi GeoEco
Arif Algifari
Universitas Negeri Padang
Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mathematics Social Sciences Transportation

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Implementation of Project Based Learning for Cognitive and Psychomotor Students in the Basic of Workshop Technology Course Welding Sub-competency in the Automotive Engineering Study Program Rahma Doni; Arif Algifari; Muhammad Irvan
invotek Vol 22 No 3 (2022): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v22i3.1073

Abstract

The higher education curriculum adopts project-based learning (PjBL) method that emphasizes the provision of knowledge with the problem solving in an organized work project within study group. This is such a solution for the problems of current conventional learning method implementation that made low enthusiasm and slow understanding student especially for Automotive Engineering student in having welding practice in The Basic Workshop Technology Course. By using experimental method in this research to compare conventional learning and PjBL method toward twenty Automotive Engineering students to evaluate cognitive and psychomotor aspect. On the steps, the lecturer starts with provides theoretical enrichment and end with welding practice. To find out the effect of implementing this project-based learning, lecturer divides the class in two study groups by differentiating learning methods, namely the group with conventional learning and the group with PjBL learning. Comparison is made between conventional learning and PjBL learning with projects processed by statistical interpretation. The results of the study showed that there was a significant effect on the results of the psychomotor evaluation of students, but not too significant for the cognitive evaluation results. Based on this research, there is a prove that PjBL is good enough to increase student’s abilities in welding practice as psychomotor representation increment.
Studi Review: Evaluasi Batubara Formasi Sawahlunto sebagai Batuan Induk Hidrokarbon Arif Algifari; Syari Rahma Yanti; Fitri Nauli
Justek : Jurnal Sains dan Teknologi Vol 6, No 3 (2023): September
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v6i3.16686

Abstract

Abstract: Hydrocarbons are still source of energies that people are interested in. This energy source does not only come from source rock of  formations and reservoirs of oil and natural gas, hydrocarbon sources can also be found in the organic depositional environment of coal formations. The Ombilin Basin in West Sumatra stores coal deposits that were formed during the Tertiary period in a non-marine environment, precisely in the Sawahlunto formation. This study aims to identify the potential of light hydrocarbons from coal as a source rock. The identification method was carried out by studying the geochemical and petrological characteristics of coal based on the literature study approach and geological survey of the basin to obtain information that the organic component of the coal of the Sawahlunto formation is dominated by vitrinite maceral. The relationship between maceral and the hydrogen/carbon ratio is plotted on a Van Krevelen diagram to determine the hydrocarbon recovery. The genesis of this coal deposit comes from plants that have the potential to produce methane coal gas or coal bed methane because it has the characteristics of bituminous class coal with high volatile content with an empirical hydrogen/carbon ratio kerogen III type of 0.65-0.7, tends to occur condensation of hydrocarbons releasing aliphatic bonds while aromatization continues increase.Abstrak: Hidrokarbon masih menjadi sumber energi yang diminati masyarakat. Sumber energi ini tidak hanya berasal dari formasi batuan induk dan reservoir minyak bumi serta gas alam, sumber hidrokarbon juga dapat ditemukan pada lingkungan pengendapan organik formasi batubara. Cekungan Ombilin di Sumatera Barat menyimpan endapan batubara yang terbentuk selama periode Tersier pada lingkungan non laut tepatnya pada formasi Sawahlunto. Penelitian ini bertujuan untuk mengidentifikasi potensi hidrokarbon ringan dari batubara sebagai batuan induk. Metode indentifikasi dilakukan dengan mempelajari karakteristik geokimia dan petrologi batubara berdasarkan metode pendekatan studi literatur dan survey geologi cekungan hingga diperoleh informasi bahwa komponen organik batubara formasi Sawahlunto didominasi oleh maseral vitrinit. Hubungan antara maseral terhadap rasio hidrogen/karbon diplot pada diagram Van Krevelen untuk menentukan perolehan hidrokarbon. Genesis endapan batubara ini berasal dari tumbuh-tumbuhan yang berpotensi menghasilkan gas metana batubara atau coal bed methane karena memiliki karakteristik batubara kelas bituminus volatil tinggi tipe kerogen III dengan rasio hidrogen/karbon empiris 0,65-0,7 cendrung terjadi kondensasi hidrokarbon melepaskan ikatan alifatik sedangkan aromatisasi terus meningkat.
TOPOGRAPHIC MAPPING, TEMPERATURE DISTRIBUTION, AND pH OF HOT SPRINGS IN PADANG GANTING, TANAH DATAR, WEST SUMATRA: A PRELIMINARY STUDY Arif Algifari; Wahyudi Ardiansyah; Ilham Gilang Ramadhan
GeoEco Vol 10, No 2 (2024): GeoEco July 2024
Publisher : Universitas Sebelas Maret (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/ge.v10i2.86131

Abstract

This preliminary study explores the hot springs in Padang Ganting, Tanah Datar, West Sumatra, at coordinates 00°34'8.404" S - 100°42'45.716" E and 0°31'26.431" S - 100°45'27.598" E. The research was conducted using geological and geochemical methods in the geothermal field. The collected data includes coordinates of the area, temperature, and pH of the hot springs. The results show a pH distribution ranges from 6 to 7 at several points of the hot springs, with slightly brackish characteristics, and the temperature of the hot springs ranges from 41°C to 51°C. The immature meteoric hot springs originate from the granite formation, indicating the possibility of magma intrusion to the surface, possibly caused by the oroclinal shear segment in the upper part of the Ombilin basin. This study provides a basis for further geological investigations into the geothermal potential and prospects for further development in the geothermal field, contributing to understanding the geological processes in the region.
Co-Authors Fitri Nauli Ilham Gilang Ramadhan Muhammad Irvan Rahma Doni Syari Rahma Yanti Wahyudi Ardiansyah