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All Journal Program Kreativitas Mahasiswa - Penelitian Jurnal Aplikasi Fisika KOVALEN: Jurnal Riset Kimia ALCHEMY Jurnal Penelitian Kimia DedikasiMU: Journal of Community Service Einstein's: Research Journal of Applied Physics Jurnal Pengabdian Kepada Masyarakat (JAPIMAS) Jurnal Analis Kesehatan Kendari Jurnal Aplikasi Fisika International Journal of Acta Material
La Agusu
Department Of Physic, Faculty Of Mathematics And Natural Sciences, Halu Oleo University, Kampus Hijau Bumi Tridharma, Anduonohu, Kendari, Sulawesi Tenggara 93232, Indonesia
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Penerapan pembelajaran STEAM untuk meningkatkan keterampilan siswa SDN 3 Sabilambo dalam memanfaatkan lingkungan sebagai media belajar di masa pandemik covid-19 Arman; Rosliana Eso; Tahir; Husein; Mardiana Napirah; La Ode Safiuddin; La Agusu
Jurnal Pengabdian Kepada Masyarakat (JAPIMAS) Vol. 1 No. 1 (2022): Februari 2022
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33772/japimas.v1i1.1

Abstract

Dalam rangka menangani keterbatasan pembelajaran di sekolah dasar dalam masa pandemi COVID-19, maka dipandang perlu untuk menggunakan metode pembelajaran yang sesuai guna meningkatkan pemahaman siswa mengenai materi pembelajaran di kelas. Metode STEAM (Science, Technology, Engineering, Arts, and Math) merupakan metode yang sangat tepat dan efektif dalam pelaksanaan pembelajaran jarak jauh (PJJ) yang dirangkaikan dengan aktivitas tatap muka terbatas. Tujuan kegiatan pengabdian ini adalah memberikan keterampilan bagi guru-guru SDN 3 Sabilambo dalam menyusun paket pembelajaran STEAM dan menghasilkan panduan Pelaksanaan Pembelajaran STEAM dengan pendekatan saintifik. Setelah media dan perangkat pembelajaran tersebut selesai dibuat, guru-guru menerapkan metode pembelajaran STEAM kepada peserta didiknya. Selanjutnya pre-test dan post-test yang disertai uji T berpasangan menunjukkan bahwa nilai t hitung > t tabel, yaitu 12,71095 > 2,09302, yang berarti bahwa perlakuan berupa pembelajaran STEAM memberikan pengaruh yang signifikan, yaitu dapat meningkatkan pemahaman siswa mengenai materi yang diajarkan.
Peningkatan pemahaman ilmu faro’id melalui pembelajaran matematika pada Santri Rumah Tahfidz Abdullaah Bin Mas’ud Kendari Al Jalali Muhammad; Ida Usman; La Agusu; La Aba; I Nyoman Sudiana; Yumna Wati
Jurnal Pengabdian Kepada Masyarakat (JAPIMAS) Vol. 1 No. 1 (2022): Februari 2022
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33772/japimas.v1i1.4

Abstract

Pembelajaran ilmu faroidh merupakan salah satu bidang ilmu yang berada dalam kurikulum di pondok-pondok pesantren. Ilmu ini sangat penting karena mempengaruhi kehidupan sosial masyarakat. Ilmu faroidh membahas tentang masalah warisan dan ahli waris. Dalam pelaksanaannya, ilmu faroidh akan lebih mudah dipahami oleh santri yang memiliki pemahaman matematika dasar yang baik. Oleh karena itu, pada kegiatan pengabdian ini, difokuskan pada peningkatan pemahaman matematika dasar  santri Pondok tahfidz Abdullah Bin Mas’ud. Fokus materi diarahkan pada pemahaman operasi penjumlahan dan pengurangan dilanjutkan dengan pemahaman operasi perkalian dan pembagian. Metode yang diterapkan adalah metode ceramah.  Para santri sangat antusias dalam pembelajaran ini dikarenakan merangsang kemampuan berpikir. Peningkatan pemahaman diperlihatkan oleh santri. Dari beberapa santri yang tidak memahami operasi penjumlahan dan pengurangan menunjukkan peningkatan pengetahuan dalam operasi tersebut. Begitupun dengan operasi perkalian dan pembagian. Beberapa santri yang tidak memahami operasi perkalian dan pembagian mengalami peningkatan mulai dari kemampuan menghafal perkalian dan menerapkan operasi perkalian dan pembagian. Pada pembelajaran juga diterapkan umpan balik sehingga dapat menguji pemahaman siswa.
Pemanfaatan Limbah Pertanian Menjadi Keramik dan Briket Arang dengan Microwave di Desa Putemata Kecamatan Ladongi Kabupaten Kolaka Timur I Nyoman Sudiana; La Agusu; Andi Tendri Ampa; Ni Putu Sri Widiasih; Muhammad Zamrun F
Jurnal Pengabdian Kepada Masyarakat (JAPIMAS) Vol. 2 No. 2 (2023): Agustus 2023
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33772/japimas.v2i2.43

Abstract

Universitas Halu Oleo sebagai lembaga pendidikan tinggi selalu berusaha melaksanakan Tri Dharma Perguruan Tinggi secara optimal baik di dalam maupun di luar kampus. Kegiatan Tri Dharma dilakukan oleh setiap civitas akademika termasuk mahasiwa. Program Kuliah Kerja Nyata (KKN) Tematik merupakan salah satu kegiatan pengabdian kepada masyarakat yang terintegrasi penelitian dosen. Melalui kegiatan ini diharapkan mahasiswa sebagai salah satu generasi penggerak pembangunan dapat menerapkan ilmunya dalam kehidupan bermasyarakat, mengetahui persoalan-persoalan yang terjadi di masyarakat dan mampu memberikan solusinya. Dalam KKN ini mahasiswa memanfaatkan energi microwave dari oven microwave untuk mengolah limbah pertanian menjadi produk bermanfaat. Kegiatan dilakukan dengan memperkenalkan dan melatih masyarakat yang ada di Desa Putemata Kecamatan Ladongi Kolaka Timur. Lokasi KKN yang berada di Desa Putemata dipilih karna sebagian besar warganya petani menyebabkan terdapat bahan baku limbah pertanian yang berlimpah. Pengolahan limbah untuk menjadi bahan yang lebih ekonomis sangat berguna bagi Masyarakat. Dalam kegiatan ini Masyarakat diperkenalkan dan dilatih aplikasi mikrowave untuk pengolahan limbah. Mahasiswa juga membantu dalam persiapan maupun pelaksanaan kegiatan-kegiatan desa diberbagai bidang.
Pretreatment batubara (tipe sub-bituminus) menggunakan metode leaching asam basa dengan NaOH dan HCl serta karakterisasi sifat fisis dan kimianya Waode Sukmawati Arsyad; Muhammad Arohman; La Agusu; Ida Usman; La Aba; I Nyoman Sudiana; Ismail Saleh; La Ode Rusman
Jurnal Aplikasi Fisika Vol. 20 No. 02 (2024): Jurnal Aplikasi Fisika
Publisher : Jurusan Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/jaf.v20i02.p17-23

Abstract

Untuk meningkatkan kualitas rGO yang dihasilkan dari batu bara maka perlu dilakukan proses pre-treatment pada sampel batu bara. Batu bara yang digunakan adalah jenis sub-bituminus dari Kolaka Timur. Proses pre-treatment yang dilakukan adalah dengan proses leaching menggunakan basa (NaOH) dengan variasi konsentrasi (1, 2, 4, 8 dan 10) M, dan asam (HCl) dengan konsentrasi tetap, yaitu 5M. Sampel batu bara dan hasil leachingnya kemudian dikarakterisasi kandungan karbon, perubahan ikatan kimianya, struktur kristal dan resistansinya menggunakan energi dispersive X-ray spectroscopy (EDS), FTIR, XRD dan LCR meter. Dari hasil EDS diperoleh rasio C/O tertinggi sebesar 1,9 untuk proses leaching dengan konsentrasi 8M NaOH+5M HCl. Terjadi penurunan kadar oksigen pada batu bara setelah melalui proses leaching NaOH+HClyang menunjukan meningkatnya kualitas batu bara yang ditandai dengan menunurunnya luas daerah pada kurva 3448 cm-1 dar grafik hasil karakterisasi q FTIR. Hal ini didukung dengan hasil karakterisasi XRD yang menunjukan batu bara yang telah dileaching dengan menggunakan NaOH dan HCl berubah menjadi grafit pada posisi 2-theta 26,5° dan intensitas grafit tertinggi pada konsentras 8M NaOH+5M HCl.
The Effect of Doping Concentration in the Work Electrodes of Graphene-MnxOy and Test on Glucose by Cyclic Voltametry L Agusu; T. Azis; Imran; Fitrianti; A. T. Nurwahida; S. Misudo; Alimin
International Journal of Acta Material Vol. 1 No. 1 (2024): August 2024
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i1.5

Abstract

A study was conducted to investigate the impact of concentration on the graphene-manganese oxide (EPG/MnxOy) working electrode for glucose analysis using the cyclic voltammetry method. To characterize the electrode material, SEM-EDX, FTIR, and XRD analyses were performed. The results revealed that the graphene surface contained aggregates in the form of small particles attached to the graphene. Various absorption bands corresponding to aliphatic -O-H, -C-H, -C=C aromatic, -C=O, -C=C, -C-O, and Mn-O groups were identified in the graphene and graphene/MnxOy materials. Crystal patterns of manganese oxide were also identified at angles 2q = 30.57o and 44.39o, representing the Mn3O4 crystal pattern, at the angle 2q=34.12o denoting the MnO2 crystal pattern, and at angles 2q= 39.85o, 57.85o, and 68.94o representing the MnO crystal patterns. The optimal electrode composition was found to be graphene:MnxOy 0.8:0.5, as indicated by an anodic peak current (Ipa) of 122 µA at a potential of -0.11 V. The most effective supporting electrolyte was determined to be NaNO3, with an anodic peak current (Ipa) of 26.4 µA at a potential of -0.13 V. The detection limit for glucose was 4.45×10-3 M. The repeatability test of EPG/MnxOy yielded a result of 1.77%.
Effect of pH and Stirring Speed on the γ-Fe2O3 Material Properties Synthesized from Iron Sand by Using Co-Precipitation Method L Agusu; Amiruddin; M. Nalis; S. Misudo; Y. Fujii; Y. Ishikawa; Alimin
International Journal of Acta Material Vol. 1 No. 1 (2024): August 2024
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i1.6

Abstract

Research has been conducted to investigate the impact of pH and stirring on the magnetic properties of γ-Fe2O3 nanoparticles derived from iron sand using the co-precipitation method. The objective of this study was to synthesize γ-Fe2O3 nanoparticles and examine how pH and stirring affect their size and properties. The co-precipitation method involved mixing iron sand with HCl as a solvent and NH4OH as a precipitator. The experimental setup included variations in pH, specifically pH 10 and pH 12, as well as stirring speeds of 600 rpm and 700 rpm. The synthesized maghemite nanoparticles were characterized using XRD (X-Ray Diffraction), SEM (Scanning Electron Microscope), and VSM (Vibrating Sample Magnetometer) techniques. XRD analysis revealed that the particle size at 600 rpm under pH 10 was 52.085 nm, whereas at 700 rpm under pH 12 it was 47.821 nm. The VSM characterization results demonstrated a remanent magnetization of 25.5 emu/gr, a coercivity field of -0.01 Tesla, and a saturation magnetization of 52.45 emu/gr. This study confirmed that the maghemite nanoparticles produced exhibited ferromagnetic properties.
Microwave-Assisted Roasting-Leaching of Nickel from Indonesian Nickel Laterite Ore A. J. Muhammad; K. Nakagawa; I P. A. Karya; A. Ndita; L. O. M. Darusman; T. Iwamoto; Y. Terui; L. Agusu; I. N. Sudiana; F. Nishimura; T. Nishiumi; T. Asano; H. Kikuchi; S. Mitsudo
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.10

Abstract

This study investigated nickel extraction from nickel laterite ore from Indonesia using the microwave roasting leaching method. The study focused on investigating the effect of microwave power and roasting temperature on the extraction of nickel. Samples from each step were characterized using X-ray diffraction (XRD) and Atomic Absorption Spectroscopy (AAS). The method has the advantage of being carried out in atmospheric conditions with high nickel extraction at low temperatures, a rapid process, and without pre-roasting as in conventional roasting. It was obtained that 92.8% of nickel was extracted by application of microwave power at 540 W, at a roasting temperature of approximately 335°C for 30 minutes. The maximum result were obtained when the heating temperature is near to the boiling point of sulfuric acid (337oC). However, the amount of nickel extracted decreases when the heating temperature is above the boiling point of sulfuric acid. The results of XRD analysis of samples after roasting and solid leaching residue samples also revealed that the maximum nickel recovery occurred when the roasting process had transformed all iron sulfate-aqueous system (Fe(OH)(SO2)2.4H2O) into iron sulfate (Fe2(SO4)3) which also directly changed NiSO4.6H2O into NiSO4 which is highly soluble in water.
Green Synthesis of ZnO Nanoparticles from Henna Leaves (Lawsonia inermis L.) and their Characterization as Photosensitizer in Dye-sensitized Solar Cells W. S. Arsyad; F. S. Palobang; L Agusu; L. O. Rusman; I. Saleh; I N. Sudiana
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.11

Abstract

The green synthesis of ZnO nanoparticles from henna leaf extract and their characterization as photosensitizers in dye-sensitized solar cells was successfully conducted. The henna leaves were extracted with three different solvents specifically distilled water (A), ethanol (E), and methanol (M). The extracts were mixed with Zinc Acetate dihydrate (Znac) with different concentrations of (0.01, 0.02, and 0.03) M to form ZnO nanoparticles. The absorbance spectrum, functional groups, and crystal structure were analyzed using UV-Vis, FTIR, and XRD. UV-Vis analysis revealed the highest absorption peaks at 580.74 nm, 503.63 nm, and 501.36 nm for samples A, E, and M. The FTIR spectrum of henna leaves confirmed the presence of Lawsone, indicated by O-H, C-H, C=O, and C-O functional groups at 3411 cm⁻¹, 2926 cm⁻¹, 1585 cm⁻¹, and 1344 cm⁻¹, respectively. XRD analysis showed the largest crystallite size (76.5 nm) for the 0.03 M Znac sample in methanol (M3), and the smallest (35.7 nm) for the 0.02 M Znac sample in ethanol (E2). The smallest energy gap (Eg) of 2.16 eV was observed in the sample using distilled water (A) as the solvent for the pure extract, while the ZnO nanoparticles (E1) sample had an Eg of 2.57 eV. We found that henna extract and the resulting ZnO nanoparticles were suitable to be used as photosensitizers in DSSC
Fabrication and Characterisation of Semi-Solid DSSCs Using Reduced Graphene Oxide (rGO) from Coal as a Filler in Polymer Gel Electrolytes W. O. Sukmawati; L. Ardan; I. Saleh; L. Agusu; I N. Sudiana; I. Usman
International Journal of Acta Material Vol. 2 No. 1 (2025): August 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i1.16

Abstract

In an effort to enhance the conductivity of TMSPMA-based polymer gel electrolytes (PGE), this study incorporated reduced graphene oxide (rGO) as a filler within the PGE matrix. The rGO was synthesized from sub-bituminous coal utilizing a modified Hummer method, while the PGE was formulated through a sol-gel process involving TMSPMA with varying proportions of rGO relative to the PGE. X-ray diffraction (XRD) measurements confirmed the presence of rGO, revealing a peak at a 2θ angle of 24.830° and a calculated crystalline size of 30.44 nm. Fourier-transform infrared spectroscopy (FTIR) characterization indicated that the identified functional groups were consistent with the molecular structure of TMSPMA. Impedance measurements conducted using an LCR meter demonstrated that the incorporation of rGO up to 0.04 g significantly enhanced the conductivity, achieving a value of 0.013 S/cm. Furthermore, photovoltaic performance testing of dye-sensitized solar cells (DSSC) indicated that the highest efficiency of 1.03% was attained with the PGE containing 0.04 g of rGO.
Development of Eco-friendly Antimicrobial Bricks Using Nickel Slag Waste Enriched with TiO2 to Counteract E. coli Contamination L. Agusu; W. O. Nurtia; M. Z. Muzakkar; I W. Sutapa; Y. Ishikawa; Y. Fujii; T. Asano; S. Mitsudo; Y. Tatematsu
International Journal of Acta Material Vol. 2 No. 1 (2025): August 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i1.20

Abstract

This study investigates the use of nickel slag waste, enriched with TiO2, as a sustainable material for producing antimicrobial bricks. The research focuses on evaluating the impact of variations in firing time and the addition of nickel slag on the mechanical properties of the bricks, as well as their antibacterial effectiveness against E. coli bacteria. The bricks were produced using an electric furnace with different composition ratios of clay, nickel slag, and TiO2. Results demonstrate that the optimal compressive strength of the bricks is 21.673 × 10⁵ N/m², achieved with a clay:slag:TiO2 ratio of 90:5:5 at a firing temperature of 1000°C for 12 hours. The water absorption rate for this composition was found to be 16.98%. Antimicrobial tests, using the scatter method, revealed that TiO2-enriched bricks significantly inhibited E. coli growth, with only two colonies present compared to 77 colonies on bricks without TiO2. X-ray diffraction (XRD) analysis confirmed the presence of key oxides such as SiO2, TiO2, and CaCO3. These findings suggest that nickel slag, when combined with TiO2, can be an effective additive in clay-based bricks to inhibit E. coli growth, offering potential for applications in water purification and environmental sustainability. Furthermore, the use of advanced heating techniques such as microwaves or gyrotrons may enhance the bricks’ structural integrity and antimicrobial performance in future applications.
Co-Authors . Yuliana A. J. Muhammad A. Ndita A. T. Nurwahida Ahmad Zaeni Al Jalali Muhammad Alimin Alimin Alimin Alimin Alimin, Alimin Alwahab Amiruddin Andi Tendri Ampa Andi Tenri Ampa Angga Febrian Ardin Anton Arman C. C. N. Taswito Darwin Ismail Elfianti. A, Warda F. Nishimura F. S. Palobang Fahmiati Fahmiati Fitrianti Gusti Adhi Wibawa H. A. Hangkea H. Kikuchi Herdianto Herdianto Husein Husein I Nyoman Sudiana I P. A. Karya I W. Sutapa I Wayan Sutapa I. Saleh I. Saleh I. Usman IDA USMAN Imran Imran Imran Imran Indriana Kartini Intan Intan Irawati Irawati Ismail Saleh K. Nakagawa Karmila Karmila Kasman L. Ardan L. O. M. Darusman L. O. Rusman L.A. Kadir La Aba La Aba La Ode Ahmad La Ode Ahmad Nur Ramadhan La Ode Rusman La Ode Rusman La Ode Safiuddin La Ode Safiuddin Lina Lestari M. Nalis M. Nalis M. Z. Muzakkar M.Pd Prof. Dr. I Nyoman Sudiana . Mardiana Napirah Muhammad Anas Muhammad Arohman Muhammad Zamrun F Mukhsar . Muzakkar, Muhammad Zakir Ni Putu Sri Widiasih Nohong Nurlian Oktavian, Putri R. Eso Risal Day Rosliana Eso Ruslan Ruslan S. Misudo S. Mitsudo Saenuddin, Saenuddin Safaani, Jamhir Sri Juari Santosa Syahrir T. Asano T. Azis T. Iwamoto T. Nishiumi Tahir THAMRIN AZIS W. O. Nurtia W. O. Sukmawati W. S. Arsyad W. S. Arsyad W. S. Nurjannah Waode Sukmawati Arsyad Y. Fujii Y. Ishikawa Y. Ishikawa Y. Tatematsu Y. Terui Yahya Yahya Yuliana Yuliana Yumna Wati Yustin Biringgalo Zainal Syam Arifin