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All Journal Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Berkala Ilmiah Pendidikan Fisika Jurnal Penelitian Pendidikan IPA (JPPIPA) ORBITA: Jurnal Pendidikan dan Ilmu Fisika JURNAL EKSAKTA PENDIDIKAN (JEP) JURNAL PENDIDIKAN TAMBUSAI Pillar of Physics: Jurnal Berkala Ilmiah Fisika Jurnal Vokasi Mekanika Journal of Climate Change Society Inventa: Journal of Science, Technology, and Innovation
Rahmat Hidayat
Departement Of Physics, Universitas Negeri Padang, Jl Prof. Dr. Hamka Air Tawar Padang 25131, Indonesia
Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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Optimization of Carbonization Temperature in the Production of Coconut Pulp-Based Activated Carbon for Thermoelectric Materials Nabila, Aliya; Darvina, Yenni; Gusnedi, -; Hidayat, Rahmat
PILLAR OF PHYSICS Vol 17, No 2 (2024)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/15346171074

Abstract

A thermoelectric generator is one of the power plants capable of converting thermal energy into electrical energy. Thermoelectricity can be derived from materials based on metal oxide composites with carbon materials, one example is the use of Copper (II) Oxide with activated carbon. Using activated carbon can help reduce thermal conductivity, which will be beneficial in its utilization as a thermoelectric material. Activated carbon comes from biomass waste that has not been fully utilized, such as coconut pulp waste. Utilization of coconut pulp waste can reduce environmental pollution and can add economic value to the waste. The goal of this research is to produce coconut pulp activated carbon at the ideal temperature for usage as thermoelectric materials. The research method used is the experimental method. Coconut pulp activated carbon is obtained through dehydration, carbonization and activation stages. The carbonization temperature variation used is at a temperature of 250ºC, 300ºC, 350ºC, 400ºC, and 450ºC. According to the results of the characterization, the yield, ash content, and bound carbon content of activated carbon decrease with increasing carbonization temperature, while the values of water content and ash content of activated carbon increase. This indicates that the activated carbon made from coconut pulp has met the requirements SNI 06-3730-1995. XRD characterization results show that coconut pulp activated carbon is amorphous and does not show sharp diffraction peaks (significant). For producing activated carbon, coconut pulp is carbonized at a temperature of 300oC to get the optimum temperature.
Synthesis of Graphene Oxide from Corncob Waste as Microwave Absorber with Modification Hummer Method Alfia Zammi; Ramli Ramli; Yenni Darvina; Rahmat Hidayat
Jurnal Pendidikan Tambusai Vol. 10 No. 2 (2026): Agustus
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jptam.v10i2.38563

Abstract

RAM (Radar Absorbing Material) diperlukan untuk menyerap gelombang mikro dalam teknologi radar. Secara umum, material penyerap memiliki nilai permeabilitas dan permitivitas yang tinggi. Oksida grafena adalah salah satu material yang dapat diaplikasikan sebagai material penyerap. Oleh karena itu, penelitian dilakukan pada sintesis oksida grafena dari limbah tongkol jagung menggunakan metode Hummer yang dimodifikasi. Variasi suhu sintering diterapkan untuk melihat pengaruhnya terhadap sifat penyerapan gelombang mikro. Suhu sintering yang digunakan dimulai dari 300˚C, 350˚C, 400˚C dan 450˚C. Karakterisasi oksida grafena dari limbah tongkol jagung menggunakan XRD, FTIR, dan VNA. Pada hasil uji VNA, nilai kehilangan refleksi maksimum oksida grafena adalah -40,35 dB pada frekuensi 10,20 GHz dengan koefisien absorpsi 99,03% dan bandwidth absorpsi 1,27 GHz. Oleh karena itu, oksida grafena dari limbah tongkol jagung berpotensi diaplikasikan sebagai material penyerap gelombang mikro.
Sintesis Kitosan Berbasis Limbah Cangkang Udang Serta Pemanfaatannya Sebagai Bahan Pengawet Alami Daging Sapi Fitri Endriyani; Rahmat Hidayat; Yenni Darvina; Fadhila Ulfa Jhora
Journal of Science, Technology, and Innovation Vol 1 No 3 (2026): : April: Inventa: Journal of Science, Technology, and Innovation
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65310/7cawgv34

Abstract

The utilization of shrimp shell waste as a source of chitosan represents a sustainable approach to developing bio-based materials while increasing the economic value of fisheries by-products. This study aimed to synthesize chitosan from shrimp shells (Litopenaeus vannamei) and evaluate its effectiveness as a natural preservative for beef. Chitosan was synthesized through deproteinization using 1 N NaOH, demineralization using 1 N HCl, and deacetylation using 50% NaOH. X-ray diffraction (XRD) analysis revealed six diffraction peaks with a dominant peak at 2θ = 19.042° and crystallite sizes ranging from 4.36 to 4.57 nm, indicating a monoclinic crystal structure. Fourier Transform Infrared Spectroscopy (FTIR) confirmed the presence of characteristic chitosan functional groups, including hydroxyl, amine, amide, and β-(1→4)-glycosidic bonds. Preservation performance was evaluated by immersing beef samples in 1% chitosan solution for 0, 15, 30, 45, and 60 minutes, followed by storage at room temperature for five days. The results showed that immersion treatments of 45–60 minutes were most effective in maintaining texture, odor quality, and pH stability. These findings demonstrate the potential of shrimp shell-derived chitosan as a safe, environmentally friendly, and economically valuable natural preservative.  
PENGARUH MOTIVASI BELAJAR TERHADAP HASIL PEMBELAJARAN BUBUT: STUDI DI KALANGAN SISWA PROGRAM KEJURUAN TEKNIK PERMESINAN Rahmat Hidayat; Jasman Jasman; Eko Indrawan; Bulkia Rahim
Jurnal Vokasi Mekanika (VoMek) Vol 6 No 3 (2024): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v6i3.715

Abstract

Penelitian ini menyelidiki korelasi antara prestasi akademis dalam penggunaan teknik permesinan bubut dan tingkat motivasi belajar yang dimiliki oleh para siswa. Metode penelitian ini melibatkan penerapan kuesioner, pencatatan nilai, dan dokumentasi. Dengan menggunakan pendekatan deskriptif korelasional dalam konteks penelitian kuantitatif, penelitian ini dilaksanakan di SMK Dhuafa Padang, dengan subjek penelitian yang terdiri dari para siswa kelas XI di Jurusan Teknik sedang mengeksplore beragam konsep dan praktik teknis Permesinan. Penelitian dilakukan pada bulan Februari dengan melibatkan partisipasi 21 siswa sebagai sampel penelitian. Hasil analisis data menunjukkan adanya korelasi yang kuat dan berarti antara tingkat motivasi belajar dan pencapaian akademis dalam Mata Pelajaran Bubut untuk siswa kelas XI Program Keahlian Teknik Permesinan di SMK Dhuafa Padang. Koefisien korelasi yang tercatat Motivasi belajar berkorelasi positif signifikan dengan prestasi belajar dalam Mata Pelajaran (r = 0,460, p < 0,05) sebesar 0,036. Studi ini memberikan sumbangan penting dalam memperluas pemahaman tentang peran krusial motivasi belajar dalam meningkatkan prestasi akademis siswa, khususnya dalam konteks pembelajaran teknik permesinan. Dengan menyadari keterkaitan yang penting antara motivasi belajar dan prestasi akademis, lembaga pendidikan dan para pendidik dapat menerapkan strategi yang lebih efisien Untuk meningkatkan semangat belajar para murid tujuan mencapai prestasi belajar yang lebih optimal dalam pelajaran teknik permesinan
Co-Authors - Ramli Alfia Zammi Bulkia Rahim Defrizal Saputra Desti Yuspita Sari Dicko Maulana Syahdan Eko Indrawan Fadhila Ulfa Jhora Fatni Mufit Fitri Endriyani Fuad Sofaturahman Gusnedi Gusnedi, - Hidayati Hidayati Hidayati Jasman Ledia Elan Safitri Lia Rifka Septiana Mairizwan Mairizwan Maritza Syalsabilla Mira Syuriyani Nabila, Aliya Nadia Raisa Aryani Nadya Aztifa Nadya Putri Herman Poppy Julia Oxana Putri Dwi Sundari Ramli Ramli Ramli Ramli Ramli Ratnawulan . Renol Afrizon Revi Indriani Riri Jonuarti Rizka Melia Putri RR. Ella Evrita Hestiandari Silvi Yulia Sari Wahyuni Satria Dewi Yenni Darvina