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All Journal Journal of Geoscience, Engineering, Environment, and Technology Prosiding Temu Ilmiah Nasional Guru Cognitia : International Engineering Journal
Harwan
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Mechanical Engineering Physics Transportation Other

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EFEKTIVITAS BELAJAR SISWA MELALUI PENDEKATAN CONTEXTUAL TEACHING AND LEARNING PADA MATERI ALJABAR Harwan; Antowo, Sulistyo Jeni; Novianti, Idha
Prosiding Temu Ilmiah Nasional Guru Vol. 15 No. 1 (2023): TING XV 2023
Publisher : Fakultas Keguruan dan Ilmu Pendidikan (FKIP), Universitas Terbuka

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Abstract

The purpose of this study is to find out how effective the contextual teaching and learning (CTL) approach in mathematics on the topic of algebra is discussed. This study was conducted in two cycles, with one meeting per cycle. This study uses test equipment to determine how effective student learning is. The results showed that the overall average score of student achievement indicators in cycle I was 69.23% and rose to 92.30% in cycle II. The average score of student learning outcomes in cycle I was 69.23% and rose to 85.00% in cycle II, resulting in classical completeness. According to this research, a contextual teaching and learning approach can help Grade VII junior high school students learn about algebraic material.
Alteration and Mineralisation of Sulphide Deposits in The Lipukasi Area, Barru Regency, South Sulawesi Province Wakila, Muhamad Hardin; Harwan; Thamsi, Alam Budiman; Aulia, Rizky Nurul; Aulia, Rieska Dewi
Cognitia : International Engineering Journal Vol. 1 No. 3 (2025): Cognitia : International Engineering Journal
Publisher : Candela Edutech Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63288/ciej.v1i3.15

Abstract

In the Lipukasi area, Barru Regency, South Sulawesi Province, sulphide deposits and complex alteration processes have been discovered. However, information regarding the alteration and mineralisation that has developed in this area is not yet available, so further research is needed to identify the types of alteration and mineralisation present in the Lipukasi area, Barru Regency, South Sulawesi Province. The purpose of this study was to determine the type of hydrothermal alteration and mineralisation that developed in the study area. The analytical method used in this research first carried out megaskopis analysis to determine the physical properties of the sample. After that, laboratory analyses of mineragraphy and X-Ray Diffraction (XRD) were carried out. The results of megascopic analysis of the two research samples are an igneous rock with a fresh grey colour, a weathered yellowish-brown colour, a massive structure, an intermediate rock type, a crystalline texture, namely holocrystalline, a granularity, namely phaneroparabolic, a relationship, namely equigranular, and a crystal shape, namely euhedral. The minerals found from the results of mineralographic and XRD analysis are Hematite, mafic mineral, goethite, silica mineral,  sulphide mineral (galena, chalcopyrite, pyrite, covellite), quartz, and kaolinite. So it can be concluded the minerals found in the study area are hematite (Fe₂O₃), mafic minerals, silica minerals, goethite (FeO₂H), galena (PbS), covellite (CuS), chalcopyrite (CuFeS₂), pyrite (FeS₂), kaolinite and quartz (SiO₂). Based on the indicated mineral composition, the type of alteration that developed in the study area is propylitic
Mineralogy and Geochemistry of Rare Earth Elements in Manganese Deposits in the Anabanua District, Barru Regency, South Sulawesi Province, Indonesia Wakila, Muhamad Hardin; Chalik, Citra Aulian; Thamsi, Alam Budiman; Jafar, Nurliah; Harwan; Umar, Emi Prasetyawati
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 4 (2025): JGEET Vol 10 No 04 : December (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.4.24882

Abstract

Research programmes on rare earth elements have not been widely carried out, especially on manganese deposits, even though manganese deposits also contain rare earth elements. Research on manganese mineralogy has been done before, however, research has not focused on rare earth metal elements found in manganese deposits, so further research is needed to find out the mineralogy, geochemistry, and gardes of rare earth metal elements in manganese deposits in the tropics. There are 3 methods of analysis at once, namely petrographic, XRD, and ICP-OES methods. The minerals found in manganese samples in the study area are: Albite, Chlorite, Plagioclase, Orthoclase, Quartz, Chlorite, Opaque, Pyrolusite, Muscovite, Diopside, Hematite, Rodochroite, Manganochromite and Manganite. Rare earth element levels in manganese deposits are Yttrium (8.7-35.5 ppm), Scandium (4-28 ppm), Lanthanum (5.3-122 ppm), Cerium (9.4-198 ppm), Praseodymium (1.3-23.6 ppm), Neodymium (690.9), Samarium (1.2-15. 4 ppm), Europium (0.6-3.5 ppm), Gadolinium (1.4-13.5 ppm), Terbium (0.241.75 ppm), Dysprosium (1.4-7.9 ppm), Holmium (0. 3-1.3 ppm), Erbium (0.8-3.2 ppm), Thulium (0.1-0.4 ppm), Ytterbium (0.8-2.4 ppm) and Lutetium (0.14-0.39 ppm). These results indicate that manganese deposits in Anabanua Village, Barru Regency, have the potential to be a source of LREE (La, Ce, Pr, Nd, and Sm) with concentrations exceeding those of several deposits around the world, making them worthy of consideration in strategic mineral exploration in Indonesia in general.
Co-Authors Alam Budiman Thamsi Antowo, Sulistyo Jeni Aulia, Rieska Dewi Aulia, Rizky Nurul Chalik, Citra Aulian Novianti, Idha Nurliah Jafar, Nurliah Prasetyawati Umar, Emi Wakila, Muhammad Hardin