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All Journal Alchemy : Journal of Chemistry Journal of Artificial Intelligence and Digital Business
Sembiring, Albert
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Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology

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Elemental Composition of Sand Puya Processed through Alkali Fusion with Sodium Hydroxide Zaharah, Titin Anita; Lestari, Agustina Duwan; Sembiring, Albert; Silalahi, Imelda Hotmarisi
ALCHEMY:Journal of Chemistry Vol 12, No 1 (2024): ALCHEMY: JOURNAL OF CHEMISTRY
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/al.v12i1.23017

Abstract

Puya sand is a well-known name by people in West Borneo, for remainder sand from gold mining conducted by local people, contains a mixture of minerals consist of elements, such as zirconium, silicon, iron, titanium and rare earth metals.  In order to recover and separate the minerals, an initial chemical process, i.e., alkali fusion reaction with sodium hydroxide has been conducted.  Puya sand that have been pre-treated, called magnetic sand (pasir tertarik magnet, PTM) was reacted with NaOH in various mass of PTM:NaOH 1:0.5, 1:1 and 1:2 as well as various temperature of 550 °C, 600 °C , 700 °C and 800 °C for each concentration variants. The X-ray diffraction (XRD) analysis showed that the main mineral found in PTM is zirconium silicate, ZrSiO4 which is crystalline, however it became an amorph material after it was reacted with NaOH at 550 °C. In a mass ration of PTM:NaOH of 1:2 at 550 °C, the reaction product calcinated at 800 °C appeared to form hematite, zirconia and silica shown by the XRD analysis. The analysis of X-ray fluorescence (XRF) demonstrated a different elemental composition in a different reaction condition. Zirconium silicate likely was decomposed to zirconate and silicate assigned by a high Zr/Si ratio, seen more obvious at the temperature of 700 °C, in which the highest Zr/Si ratio was found at the mass ratio of PTM:NaOH, 1:2. The fusion reaction between PTM and NaOH at 600 °C and PTM:NaOH of 1:2 resulted in a material with the highest concentration of iron element relative to other elements. Reaction undertaken at 700 °C and mass ratio of PTM:NaOH of 1:0.5 gave a product with the highest concentration of titanium elements or oxide. Depends on the mineral target aimed to decompose, the condition of alkali fusion reaction is an important aspect to take into account.
Pengalaman Pengguna sebagai Penentu Nilai Kecerdasan Buatan pada Layanan Kesehatan Digital Sirkumsisi Kelana, Bayu; Sembiring, Albert
RIGGS: Journal of Artificial Intelligence and Digital Business Vol. 4 No. 4 (2026): November - January
Publisher : Prodi Bisnis Digital Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/riggs.v4i4.5603

Abstract

Perkembangan kecerdasan buatan (Artificial Intelligence/AI) mendorong transformasi berbagai model bisnis layanan kesehatan digital. Namun, nilai AI dalam konteks layanan yang bersifat sensitif dan berbasis kepercayaan masih belum sepenuhnya dipahami dari perspektif pengalaman pengguna. Penelitian ini bertujuan untuk mengeksplorasi bagaimana pengalaman pengguna membentuk pemaknaan dan nilai AI dalam konteks layanan kesehatan digital sirkumsisi. Penelitian ini menggunakan pendekatan kualitatif dengan analisis tematik reflektif terhadap data wawancara mendalam dari empat pengguna bermakna yang terlibat langsung dalam praktik layanan. Empathy map digunakan sebagai kerangka analitis untuk mengorganisasi dimensi pengalaman pengguna secara kognitif, emosional, dan perilaku. Hasil penelitian mengidentifikasi empat tema utama, yaitu: (1) pendekatan human-centered sebagai fondasi nilai AI, (2) otomasi administratif sebagai sumber nilai praktis AI, (3) pengaruh konteks skala layanan dan praktik profesional terhadap pemaknaan AI, serta (4) nilai profesional dan etika sebagai batas penerimaan AI. Temuan menunjukkan bahwa AI dipersepsi bernilai ketika digunakan untuk mendukung tugas non-inti dan selaras dengan alur kerja serta nilai profesional pengguna. Sebaliknya, penerapan AI pada aspek inti layanan yang menyentuh empati dan pengambilan keputusan klinis dipersepsi memiliki batas etis yang jelas. Penelitian ini berkontribusi pada literatur AI dan bisnis digital dengan menegaskan peran sentral pengalaman pengguna dalam penciptaan nilai AI pada layanan kesehatan digital yang kontekstual dan berbasis kepercayaan.
Co-Authors Imelda Hotmarisi Silalahi Kelana, Bayu Lestari, Agustina Duwan Zaharah, Titin Anita