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All Journal Journal of Tropical Soils BAREKENG: Jurnal Ilmu Matematika dan Terapan Jurnal Penelitian Pendidikan Fisika Jurnal Biofiskim: Pendidikan dan Pembelajaran IPA Amal Ilmiah: Jurnal Pengabdian Kepada Masyarakat Einstein's: Research Journal of Applied Physics
la Ode Safiuddin
1Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung
Agriculture, Biological Sciences & Forestry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation

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USING A MONOTONE SEQUENCE OF FUNCTIONS TO DETERMINE THE SHORTEST ARC LENGTH OF CIRCLES CONNECTED ANY TWO POINTS ON SPHERE Djafar, Muhammad Kabil; Safiuddin, La Ode; Laome, Lilis; Muhtar, Norma; Budiman, Herdi; Cahyono, Edi; Gubu, La.; Alfian, Alfian; Alamsyah, Indra; Kohalsum, Askar
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 19 No 3 (2025): BAREKENG: Journal of Mathematics and Its Application
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/barekengvol19iss3pp1923-1932

Abstract

This paper discusses about arc length of circles that connected any two points on a sphere. On a sphere, there are infinitely many circles that connect any two points. Using a monotone sequence of functions, we can show that the shortest arc length of circle that connect any two points on sphere is the circle with its center at the origin.
Variation of Chemical Elements and their Associations in Laterite Soil Profile Tufaila, M; Safiuddin, La Ode; Eso, Rosliana; Kasmiati, Sitti; Syaf, Hasbullah; Nur Ramadhan, La Ode Ahmad; Hasrorayan, .; Ardin, .
JOURNAL OF TROPICAL SOILS Vol. 20 No. 2: May 2015
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2015.v20i2.111-118

Abstract

The objective of this study was to evaluate the variations of twelve chemical elements (Ni, Fe, Co, Mg, Mn, Al, Si, Zn, Ti, P, Ca and Cr) in laterite soil profiles from Wantulasi area in South East Sulawesi Province of Indonesia. Eighty four (84) samples of three profiles (i.e. each profile consists of eight samples) had been used to study their variations in soil using the X-Ray Fluorescence (XRF). Results analysis of the chemical elements content in three profile using XRF indicated that there were good correlationsbetween the chemical elements in the soil profile with the significant correlations were found in Ni and Fe, Ni and Si, Ti and P, Fe and Al, and Co and Mn, respectively. On the other hand,the results of study showed that the variations of the chemical elements could be related to the enrichment and translocation of the elements in soil profile and also their possibilities to be related with a given chemical elements in soil profile. Therefore, we suggest that the observed patterns in chemical elements with a good correlation in laterite profile can be used as proxies to integrate the evaluation of the chemical and physical weathering process based on the elements characteristics in soil profiles.
Pembelajaran Berdiferensiasi Untuk Meningkatkan Pengetahuan Dan Keyakinan Guru Kimia Fahyuddin; Jahidin; Rahman, Abraham; Safiuddin, La Ode
Amal Ilmiah: Jurnal Pengabdian Kepada Masyarakat Vol. 5 No. 2 (2024): Edisi Mei 2024
Publisher : FKIP Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36709/amalilmiah.v5i2.206

Abstract

Pengabdian ini bertujuan untuk meningkatan pengetahuan dan keyakinan guru Kimia terkait penerapan pembelajaran berdiferensiasi. Mitra pengabdian terdiri atas 15 guru kimia SMA di Kabupaten Konawe yang tergabung dalam musyawarah guru mata pelajaran (MGMP) kimia. Modul pelatihan menggunakan pendekatan situated learning (sesuai kondisi Guru). Tahapan pelatihan meliputi:  identifikasi pengetahuan dan keyakinan awal mitra, pengembangan materi pembekalan berdasarkan data awal, dan pelaksanaan.  Analisis data awal menunjukkan bahwa pengetahuan dan keyakinan mitra sangat beragam dan ada yang miskonsepsi. Sebagian besar mitra tidak meyakini bahwa pembelajaran berdiferensiasi dapat meningkatkan prestasi belajar kimia siswa. Berdasarkan pengetahuan awal mitra, dikembangkan salah satu contoh diferensiasi konten menggunakan strategi kesukaran terdegradasi. Hasil pelaksanaan pelatihan menunjukkan bahwa pengetahuan mitra terkait konsep pembelajaran beriferensiasi meningkat, dan sebagian besar mitra mempunyai keyakinan bahwa penggunaan strategi kesukaran terdegradasi pada pembelajaran kimia dapat meningkatkan minat belajar dan prestasi belajar kimia. Mitra guru kimia mengalami peningkatan secara kualitatif dan kuantitatif terkait dengan keyakinan dan pengetahuan desain pembelajaran berdiferensiasi. Mereka memberikan komentar positif terkait implementasi pembelajaran berdiferensiasi, seperti siswa berbakat akan semakin berkembang karena tidak perlu lagi menunggu temannya yang belum paham. Hasil analisis data kuantitatif menunjukkan terjadi peningkatan pengetahuan sebesar 40% dan keyakinan sebesar 80%.
Co-Authors Abdin Alfian Alfian Amran Amran Ananda, Rama Widho Ardin, . Arisona Arisona Asriani, Sitti Budiman, Herdi Djafar, Muhammad Kabil Edi Cahyono Eso, Roliana Fahyuddin Fahyuddin Fahyuddin, Fahyuddin Fiqriawan, M. Ridho Gubu, La. Halima, Halima Hasanudin, La Hasbullah Syaf Hasrorayan, . Indra Alamsyah Jahidin Jahidin Jahidin Khairani, Miftah Kohalsum, Askar Lazahimu, Erlina Lilis Laome M Tufaila M.Pd Prof. Dr. I Nyoman Sudiana . Muhammad Yasin Muhtar, Norma Muliddin Nur Ramadhan, La Ode Ahmad Nurdianto Nurdianto, Nurdianto Rahman, Abraham Rosliana Eso Sitti Kasmiati Yunus, Mardi