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All Journal Jurnal Teori dan Aplikasi Fisika Prosiding Seminar Nasional Universitas Serambi Mekkah
Zulkarnain jalil
Universitas Syiah Kuala
Agriculture, Biological Sciences & Forestry Astronomy Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Mechanical Engineering Physics Other

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SEBARAN PASIR BESI PADA PERMUKAANSUBSTRAT SUNGAI LEUNGAH, ACEH BESAR Syahrul Purnawan; Ardyansyah Ardyansyah; Sofyatuddin Karina; Muhammad Adam; Zulkarnain jalil
Prosiding Seminar Nasional USM Vol 1, No 1 (2017): Prosiding Seminar Nasional USM
Publisher : Universitas Serambi Mekkah

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (739.161 KB)

Abstract

Penelitian ini bertujuan untuk mengetahui distribusi kandungan magnetite dari sedimen pada sistemfluvial di Gampong Leungah, Kabupaten Aceh Besar. Pengambilan data dilakukan pada bulan Februari 2017.Sebanyak 10 stasiun ditentukan untuk pengambilan sampelsedimen berdasarkanmetode coring menggunakan pipa paralon yang dimodifikasi dengan diameter 2,5 inchi. Penelitian inimembagi wilayah penelitian menjadi dua kawasan, yaitu daerah aliran sungai dan muara.Lapisansedimen dengan ketebalan 15 cm diproses ayak basah untuk memisahkan sampel berdasarkan ukuranbutir pada tiap fraksinya.Setelah kering sedimen diseparasi menggunakan magnet kuat neodymiumn35 untuk memisahkan bijih besi dari sedimen.Hasil yang diperoleh menunjukkan bahwa konsentrasimagnetite lebih tinggi pada daerah aliran sungai, dengan ukuran butiran yang lebih kasar.Kondisitersebut menjelaskan bahwa sumber magnetite berasal dari daerah hulu Sungai Leungah danterakumulasi hingga daerah muara dan pantai. 
Karakterisasi Kopi Unggulan Indonesia Jenis Arabika Sangrai Medium To Dark Menggunakan Fourier Transform Infra Red Nurul Mafazi; Zulkarnain Jalil; Elin Yusibani
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 02 (2024): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v12i02.397

Abstract

This research was conducted to determine the chemical characteristics of Arabica Indonesia's coffee beans. Four types of coffee beans are taken as samples, i.e., from Toraja, Wamena, Kintamani, and Flores, then roasted to the medium to dark level around temperatures (213-215)°C within 9-13 minutes. Chemical properties testing in the form of identification of functional groups of coffee beans before and after the roasting process is carried out using FTIR. The results showed that the roasting process affects the functional groups and the appearance of flavor compounds in roasted coffee beans. There is the appearance of ether groups in the 1000-1300 cm-1 spectra region, aromatic acid groups in the 1680-1700 cm-1 spectra region, vinyl and lactone ester groups in the 1762-1780 cm-1 spectra region, 1724-1739 cm-1 aldehyde groups, 1740-1755 cm-1 aliphatic ester groups, 1705-1714 cm-1 aliphatic acid groups, and ketone groups in 1705-1725 cm-1 spectra region. Carbohydrates in the region of 1400-900 cm-1 are seen to have decreased transmittance. Keywords: medium to dark roasting, coffee, FTIR.
Co-Authors Ardyansyah Ardyansyah Elin Yusibani Muhammad Adam Nurul Mafazi Sofyatuddin Karina Syahrul Purnawan