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Dwi Asmi
Lampung University
Astronomy Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Pengaruh Waktu Pengeringan Sampel Batubara Tarahan Terhadap Nilai Inherent Moisture Dan Nilai Kalor Batubara wahyuning ramadhanta ardanti; Dwi Asmi; Dahlia Dahlia
Jurnal Fisika Indonesia Vol 24, No 3 (2020)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v24i3.57613

Abstract

Telah dilakukan pengujian tentang pengaruh waktu pengeringan sampel batubara tarahan terhadap nilai inherent moisture dan nilai kalor dengan tujuan untuk menentukan pengaruh waktu pengeringan, menentukan selisih nilai inherent moisture dan nilai terhadap waktu pengeringan dan menentukan hubungan antara nilai inherent moisture dan nilai kalor. Sampel batubara yang digunakan dengan kode sampel TRH 412 sampai dengan TRH 416 dan TRH 430 sampai dengan TRH 434. Pengujian yang dilakukan menggunakan standar BS (British Standar). Perbedaan yang diperoleh nilai inherent moisture dan nilai kalor mengahasilkan 7,11 % dan 727 Cal.gr sehingga didapatkan 1% inherent moisture menghasilkan nilai kalor 102,25 Cal/gr. Hasil pengujian nilai inherent moisture dan nilai kalor pada pengeringan 24 jam didapatkan rata-rata sebesar 11,43% dan 6.236,4 Cal/gr. Pada pengujian dengan pengeringan 3 jam didapatkan hasil nilai inherent moisture dan nilai kalor rata-rata sebesar 18,54% dan 5.509,4 Cal/gr. Waktu pengeringan sangat berpengaruh pada nilai inherent moisture dan nilai kalor karena semakin lama pengeringan maka nilai inherent moisture akan turun dan nilai kalor akan naik.
Analisis Dinamika Molekuler Pengaruh Suhu Tubuh Terhadap Keseimbangan Volume Human Serum Albumin (HSA) Menggunakan Model Potensial Lennard-Jones Muhammad Rasyid Sidik; Yanti Yulianti; Dwi Asmi
Jurnal Teori dan Aplikasi Fisika Vol. 8 No. 2 (2020): 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.v8i2.262

Abstract

SINTESIS DAN KARAKTERISASI WOLLASTONITE BERBASIS PREKUSOR BIOGENIK SILIKA ABU SEKAM PADI Amilia Rasitiani; Dwi Asmi; Muhammad Badaruddin
Jurnal Teori dan Aplikasi Fisika Vol. 11 No. 1 (2023): 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.v11i1.336

Abstract

The aim of this research is to make wollastonite from silica obtained from rice husk ash and commercial calcium carbonate using the solids reaction method. The DTA-TGA results show mass due to the evaporation of H2O and the decomposition of CaCO3 into CaO along with the calcination temperature, in addition, the DTA results also identify the formation of the ?-CaSiO3 phase and the ?-CaSiO3 phase. The XRD results of wollastonite obtained were dominated by the ?-CaSiO3 phase and the minor phase was ?-CaSiO3 this was indicated by the peak intensity of the ?-CaSiO3 phase which was higher than the peak intensity of the ?-CaSiO3 phase. the second phase in wollastonite is also the result of FTIR results through the analysis of the Si-O-Ca functional group in each wollastonite sample. In addition, the results of the SEM analysis showed the shape of the spheroidal particles (spherical) with an average grain size of 0.19 m, 0.35 m and 0.68 m for the calcination temperatures of 900 oC, 1000 oC and 1100 oC, respectively. The results of this study indicate that the manufacture of wollastonite from the basic ingredients of rice husk silica and commercial calcium carbonate has potential as an alternative material for the manufacture of wollastonite.
Co-Authors Amilia Rasitiani Dahlia Dahlia Muhammad Badaruddin Muhammad Rasyid Sidik wahyuning ramadhanta ardanti Yanti Yulianti