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All Journal Automotive Experiences Jurnal Ilmiah Matematika (JIMAT) KAMBOTI : Jurnal Sosial dan Humaniora
La Kalamu, La Yusran
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Religion Aerospace Engineering Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Education Electrical & Electronics Engineering Energy Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences

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Optimization of the MCM-48 Synthesis Method as a Catalyst in the Esterification of Nyamplung Seed Oil into Biodiesel Kolo, La; La Kalamu, La Yusran; Soekamto, Nunuk Hariani; Taba, Paulina; Fauziah, St.; Maming, Maming; Zakir, Muhammad
Automotive Experiences Vol 7 No 1 (2024)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.10570

Abstract

This study was conducted to synthesize MCM-48 based on the surfactants (cetyltrimethylammonium bromide (CTAB) and Triton X-100). The effect of surfactant on MCM-48 was studied in the esterification of nyamplung seed oil. Optimization of the amount of surfactant in the MCM-48 catalyst in the esterification of nyamplung seed oil was carried out by washing and calcination methods. Comparison of GC-MS method and acid-base titration was also studied to determine the activity of the MCM-48 catalyst in the esterification. The results of the Mann Whitney statistical test showed that there was no significant difference (Asymp. Sig. (2-tailed) = 0.967) for the two methods. The effect of the active site on the MCM-48 catalyst activity in the esterification was characterized by FTIR and XRD. The catalyst's activity is significantly influenced by both the percentage transmittance of the silanol active site and the surfactant removal method. The MCM-48 catalyst manufactured by calcination (CTAB-MCM-48/650) performed 12.31% better than the washing approach (CTAB-MCM-48/1w). However, the CTAB-MCM-48 catalyst can be applied to the simultaneous reaction (esterification and transesterification) of the conversion of nyamplung seed oil into biodiesel.
Pengaruh Locus of Control Terhadap Motivasi Belajar Siswa La Kalamu, La Yusran
KAMBOTI: Jurnal Sosial dan Humaniora Vol. 1 No. 2 (2021): KAMBOTI: Jurnal Sosial dan Humaniora
Publisher : Lembaga Layanan Pendidikan Tinggi Wilayah XII

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51135/kambotivol1issue2page133-143

Abstract

Motivation to learn can be interpreted as a desire that arises in a person to carry out learning activities in order to obtain the expected goals. This desire comes from outside yourself or comes from within a person. One of the internal factors that influence learning motivation is locus of control (LoC). LoC is a person's self-control towards the success he achieves in his daily activities. The purpose of this study was to determine the direct effect of LoC on student learning motivation. This type of research is a causal survey with path analysis type. The number of research samples were 95 students who were selected by multistage random sampling randomly from 1729 students. The results of the study of LoC variables and learning motivation were collected through an attitude scale then processed statistically. The description of the results of the student learning motivation data reached an average of 121.97, the standard deviation value was 121.97, the mode value was 114.77, the median value was 118.39; with 43 students (45%) obtaining scores below the mean interval. It was obtained that 34 students (36%) obtained the value lies in the average interval score, as many as 18 students (19%) achieved a value above the average interval. The results of the independent variable data (LoC) achieved an average value of 150.89, a median value of 158, 57, a mode value of 146.64 and a standard deviation of 25.53, with 42 students (44%) obtaining a score below the average interval . As many as 19 students (20%) obtained scores that were located on the average interval, then 34 students (36%) obtained scores above the average interval. Based on the results of data analysis, it is concluded that LoC has a positive direct effect on the learning motivation of students at State Junior High Schools in Gorontalo City. The creation of student learning motivation is influenced by their LoC.
Inovasi Model Proyek Based Learning Berbasis Sains, Teknologi, Teknik, Dan Matematika Terhadap Penalaran Matematis Dan Motivasi Belajar Siswa SMA Tinamba, Safri; La Kalamu, La Yusran
JIMAT: Jurnal Ilmiah Matematika Vol 7 No 1 (2026): Januari-Maret 2026
Publisher : Program Studi Pendidikan Matematika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63976/jimat.v7i1.1070

Abstract

Penalaran matematis merupakan kesanggupan seseorang dalam menyusun bukti, memberi penjelasan dan mengambil sebuah kesimpulan dari permasalahan yang dihadapi. Berdasarkan hasil observasi yang telah dilakukan di SMA Negeri 8 Kota Tidore Kepulauan (TIKEP) menunjukkan bahwa proses pembelajaran dan soal-soal evaluasi yang diberikan belum berorientasi untuk mengembangkan kemampuan penalaran matematika. Hal ini mengakibatkan rendahnya kemampuan penalaran matematika siswa. Siswa kesulitan menganalisis informasi yang ada, cenderung menerima apa adanya informasi yang disampaikan maupun yang tertulis dalam buku, dan pasif dalam mengajukan pertanyaan-pertanyaan maupun menjawab pertanyaan dari permasalahan yang diajukan guru. Faktor lain yang dapat mempengaruhi kemampuan penalaran matematika siswa masih rendah diakibatkan karena kurangnya motivasi belajar siswa. Tujuan penelitian ini adalah (1) mengetahui perbedaan penalaran matematis siswa kelas XI SMA Negeri 8 Kota Tidore Kepulauan sebelum dan sesudah perlakuan model pembelajaran PjBL berbasis STEM; (2) mendeskripsikan motivasi belajar siswa kelas XI SMA Negeri 8 Kota Tidore Kepulauan sebelum dan sesudah perlakuan model Proyek Based Learning (PjBL) berbasis sains, teknologi, teknik, dan matematika (STEM). Metode yang digunakan pada penelitian ini adalah Pre-Experimental one-Group pretest-posttest design. Waktu penelitian ini dilakukan semester genap. Jumlah populasi penelitian ini adalah 86 siswa dan sampel dipilih 1 kelas dari 3 kelas secara acak diperoleh sebanyak 28 siswa. Instrument pengumpulan data terdiri atas instrument tes dan non test. Instrument test dalam bentuk uraian untuk mengukur kemampuan penalaran matematis. Sedangkan instrument non test merupakan angket motivasi belajar dengan menggunakan Skala Likert. Hasil penelitian menunjukan bahwa (1) terdapat perbedaan penalaran matematis siswa secara signifikan sebelum dan sesudah perlakuan model pembelajaran PjBL berbasis STEM; (2) terdapat perbedaan motivasi belajar siswa secara signifikan sebelum dan sesudah perlakuan model Proyek Based Learning (PjBL) berbasis sains, teknologi, teknik, dan matematika (STEM). Bagi peneliti lain, menjadikan hasil penelitian ini sebagai pedoman dan bahan pertimbangan dalam penelitian selanjutnya yang relevan.
Co-Authors Kolo, La Maming Maming Muhammad Zakir Nunuk Hariani Soekamto Paulina Taba St. Fauziah Tinamba, Safri