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All Journal Jurnal Kolaboratif Sains Jurnal Riset Rumpun Matematika dan Ilmu Pengetahuan Alam (JURRIMIPA)
Intan Septia Sari Lubis
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Penerapan Aplikasi Termodinamika pada Lemari Es dalam Kehidupan Sehari-Hari: Application of Thermodynamics Applications in Refrigerators in Daily Life Annisa Aulia Putri; Awan Azsari; Indry Syahfitri Ritonga; Intan Septia Sari Lubis; Miftahul Faiz Nasution
Jurnal Kolaboratif Sains Vol. 8 No. 3: Maret 2025
Publisher : Universitas Muhammadiyah Palu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56338/jks.v8i3.6883

Abstract

Penelitian ini membahas penerapan konsep termodinamika pada lemari es dalam kehidupan sehari-hari, khususnya prinsip-prinsip hukum termodinamika pertama dan kedua. Melalui metode deskriptif kualitatif, penelitian ini mengkaji bagaimana energi panas dipindahkan dan diubah dalam sistem pendingin lemari es untuk menjaga suhu tetap rendah. Siklus refrigerasi yang melibatkan kompresor, kondensor, evaporator, dan komponen lainnya dianalisis untuk memahami efisiensi energi dan dampaknya terhadap konsumsi listrik rumah tangga. Hasil penelitian menunjukkan bahwa prinsip dasar termodinamika memainkan peran penting dalam desain dan kinerja lemari es, termasuk pengoptimalan efisiensi melalui penggunaan refrigeran modern dan desain heat exchanger. Studi ini memberikan wawasan tentang pengaruh teknologi pendingin terhadap kehidupan sehari-hari dan peluang untuk meningkatkan efisiensi energi.
Perkembangan Material Barium Heksaferrit Doping Lantanum sebagai Penyerap Gelombang Elektromagnetik: Tinjauan Literatur Intan Septia Sari Lubis; Miftahul Husnah
JURNAL RISET RUMPUN MATEMATIKA DAN ILMU PENGETAHUAN ALAM Vol. 4 No. 3 (2025): Desember : JURRIMIPA: Jurnal Riset Rumpun Matematika dan Ilmu Pengetahuan Alam
Publisher : Pusat riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurrimipa.v4i3.8289

Abstract

The development of lanthanum-doped barium hexaferrite materials has attracted considerable attention in the field of functional materials, particularly as electromagnetic wave absorbers. This literature review aims to analyze advances in synthesis methods, structural characteristics, magnetic properties, and electromagnetic absorption performance of lanthanum-doped barium hexaferrite reported in various studies. Synthesis techniques such as sol–gel, coprecipitation, solid-state reaction, and hydrothermal methods are compared to evaluate their effects on crystallite size, morphology, and phase purity. Lanthanum doping is known to modify lattice parameters, reduce coercivity, and enhance complex permittivity and permeability, which play crucial roles in absorption mechanisms. Furthermore, variations in dopant concentration significantly influence reflection loss values and effective absorption bandwidth. The reviewed literature indicates that optimization of composition and synthesis routes can produce materials with high absorption capability, good stability, and strong potential for application in electromagnetic interference mitigation devices. This review is expected to serve as a conceptual reference for future development of lanthanum-doped barium hexaferrite–based electromagnetic wave absorbing materials. The comparative approach also highlights research challenges, industrial application opportunities, and future research directions relevant to the evolving demands of modern communication and defense technologies at both national and global levels.
Co-Authors Annisa Aulia Putri Awan Azsari Indry Syahfitri Ritonga Miftahul Faiz Nasution Miftahul Husnah