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All Journal JEID Journal Serambi Engineering (JSE) Jurnal Didaktik Matematika
Afif Afghohani
universitas veteran bangun nusantara
Religion Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Other

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Analisis Kemampuan Problem Solving Mahasiswa Pada Mata Kuliah Analisis Kompleks Ditinjau dari Kemampuan Awal Annisa Prima Exacta; Krisdianto Hadiprasetyo; Afif Afghohani; Erika Laras Astutiningtyas
JEID: Journal of Educational Integration and Development Vol. 1 No. 2 (2021)
Publisher : Education Mind Based Development Association

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55868/jeid.v1i2.86

Abstract

Tujuan penelitian ini adalah untuk mengetahui kemampuan problem solving mahasiswa ditinjau dari kemampuan awal. Penelitian ini dilakukan di progdi pendidikan matematika Universitas Veteran Bangun Nusantara pada mata kuliah Analisis Kompleks dengan menggunakan metode deskriptif kualitatif. Data tentang kemampuan awal diperoleh dari pre-test, sedangkan data tentang kemampuan problem solving diperoleh dari hasil tes uraian dan hasil wawancara. Pengambilan subyek dilakukan dengan teknik purposive sampling. Validasi data dilakukan dengan triangulasi metode. Analisis data dilakukan melalui tahap reduksi data, penyajian data dan penarikan kesimpulan. Dari hasil analisis data didapat kemampuan problem solving mahasiswa ditinjau dari kemampuan awal sebagai berikut. Mahasiswa dengan kemampuan awal tinggi berada pada kategori kemampuan problem solving completion, substance, dan approach. Sedangkan, mahasiswa dengan kemampuan awal sedang dan rendah berada pada kategori kemampuan problem solving substance, approach, dan result. Kata kunci : problem solving, kemampuan awal, analisis kompleks
Environmentally Friendly Synthesis of Ferric Chloride Coagulant from Scrap Iron for the Reduction of ion ferro and Total Dissolved Solids Sumardiyono; Sunardi; Argoto Mahayana; Nur Hidayati; Soebiyanto; Mahardira Dewantoro; Afif Afghohani
Jurnal Serambi Engineering Vol. 11 No. 3 (2026): Juli 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

The decline in groundwater quality, particularly in terms of TDS and Fe²⁺ levels, is a major concern in clean water supply. This study aims to synthesize and evaluate the effectiveness of FeCl₃ coagulant synthesized from scrap iron waste from a lathe workshop in reducing Total Dissolved Solids (TDS) and Fe²⁺ levels in borehole water. FeCl₃ was synthesized by reacting scrap iron waste with a 32% HCl solution. Water samples were tested for TDS and Fe²⁺ levels before and after treatment using gravimetric and UV-Vis spectrophotometric methods. The FeCl₃ coagulant doses used were 0.1%, 0.2%, and 0.3%. The results showed that the 0.3% dose provided the highest effectiveness in reducing Fe²⁺ levels by 80.10%, while the reduction in TDS reached 36.05% at the same dose. All doses successfully reduced Fe²⁺ levels to below the threshold set by Ministry of Health Regulation No. 2 of 2023 (<0.2 mg/l). This study demonstrates that FeCl₃ coagulant derived from iron waste is effective and has the potential to serve as an economical and environmentally friendly alternative for water treatment.
Mental Construction of Ring Theory Concepts Among Pre-service Mathematics Teachers: A Multi-Case APOS Analysis Vemas Dwi Agustino; Herry Agus Susanto; Afif Afghohani
Jurnal Didaktik Matematika Vol. 13 No. 1 (2026): Jurnal Didaktik Matematika
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jdm.v13i1.1992

Abstract

Despite its foundational role, pre-service mathematics teachers frequently struggle with the high level of mathematical abstraction and the deductive arguments required to construct abstract algebra concepts, particularly Ring Theory. This study maps and analyzes the cognitive variations and mental structures of pre-service mathematics teachers facing these challenges within the APOS framework. Addressing single-case design limitations, this qualitative study employs a multi-case comparative design involving three high-ability pre-service teachers selected through strict criterion sampling. Data were gathered via a written diagnostic test and task-based clinical interviews for the primary subject, complemented by textual content analysis of written artifacts for the corroborative subjects. The results reveal that in the Action stage, subjects relied heavily on external axiomatic checklists. In the Process stage, they successfully internalized algebraic properties as mental operations. Transitioning to the Object stage, they encapsulated dynamic processes into static mathematical entities by treating rings as unified structures, ultimately synthesizing these into a coherent Schema. Crucially, cross-case analysis establishes that advanced algebraic schema development relies on bidirectional flexibility—the fluid capability to rapidly encapsulate processes into objects and de-encapsulate objects back into processes.
Co-Authors Argoto Mahayana Erika Laras Astutiningtyas Exacta, Annisa Prima Hadiprasetyo, Krisdianto Herry Agus Susanto Mahardira Dewantara Nur Hidayati Soebiyanto Sumardiyono Sunardi Vemas Dwi Agustino