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All Journal Jurnal Darma Agung Makara Journal of Science J-CEKI
Ambarwati, Vita
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Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Social Sciences

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Analysis on the Crystal Structure of the Piezoelectric Nanocrystal Ceramic of Pr-doped Bi1/2Na1/2TiO3 using Molten-Salt Synthesis Ahda, Syahfandi; Ambarwati, Vita; Mardiyanto, Mardiyanto; Sukirman, Engkir; Sugeng, Bambang
Makara Journal of Science Vol. 25, No. 3
Publisher : UI Scholars Hub

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Abstract

One of the future technologies in nuclear reactors is the ability of piezoelectric materials to monitor reactor cores as sensors. Particularly, Pb-free piezoelectric materials, such as Bi1/2Na1/2TiO3, have been examined to improve the ability of their piezoelectric properties. In this study, we attempted to add Pr6O11 dopant material with mole ratios of 0, 0.3, 0.5, and 0.7 mol%. The synthesis process used in this study is the molten-salt synthesis method with a NaCl and KCl salt mole ratio of 1:1. The crystal structure analysis using the refinement process of the Rietveld method of the HighScore software was performed. Accordingly, a rhombohedral crystal structure system with lattice parameters of 3.8809(2), 3.8831(2), 3.8834(7), and 3.8816(2) angstroms and variations in the content of Pr6O11 was obtained. The optimal lattice parameter was discovered with the addition of 0.5 mol% of Pr6O11. The morphology of the synthesis product is still unclear for each addition of dopant material due to the large number of granular agglomerations.
STUDI LITERATUR: ANALISIS PENGARUH DOPING PADA KATODA NMC 811 DALAM MENINGKATKAN KINERJA ELEKTROKIMIA BATERAI LITHIUM-ION Ambarwati, Vita; Masyrofi, Mohammad Iqbal Faza
JURNAL DARMA AGUNG Vol 32 No 5 (2024): OKTOBER
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Darma Agung (LPPM_UDA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46930/ojsuda.v32i5.5412

Abstract

Lithium-ion batteries (LIBs) are a widely used energy storage technology, especially in electric vehicles and renewable energy, due to their high energy density and long cycle life. One of the promising cathode materials is NMC 811 (Nickel Manganese Cobalt) due to its large energy capacity. However, the issues of capacity degradation and cycle stability are still major challenges in the development of this material. This research focuses on doping strategies to improve the electrochemical performance of NMC 811 cathode. The addition of elements such as aluminum (Al), tin (Sn), and scandium (Sc) has been shown to be effective in improving retention capacity, conductivity, and structural stability. The purpose of this study is to analyze the effect of doping on the specific capacity, coulombic efficiency, cycle stability, and ionic conductivity of NMC 811 cathodes, while identifying the most effective dopant elements. This research uses a descriptive qualitative approach with literature study techniques from various scientific sources. The results show that doping is an effective solution to overcome the limitations of NMC 811 cathode, supporting the development of better lithium-ion batteries for the future. In addition to improving electrochemical performance, doping also contributes to a more efficient and sustainable energy storage technology.
Strategi Pemasaran Digital melalui E-Commerce untuk Meningkatkan Kompetensi UMKM di Desa Cerme Lor Krisna, Agung Dwi; Fauziah, Balqiz; Zulyani, Zulyani; Wahyuningtyas, Sri Harnindawati; Solihah, Athima Ninatus; Irawan, Ike Fitri; Ambarwati, Vita
J-CEKI : Jurnal Cendekia Ilmiah Vol. 4 No. 6: Oktober 2025
Publisher : CV. ULIL ALBAB CORP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56799/jceki.v4i6.12522

Abstract

Di era modern ini, digital marketing memainkan peran penting dalam dunia bisnis khususnya pelaku usaha seperti UMKM. Keberadaan UMKM diharapkan dapat meningkatkan perekonomian Indonesia. Salah satu media digital marketing yang dapat digunakan yaitu e-commerce. E-commerce telah menjadi salah satu alat yang efektif untuk memperluas jangkauan pasar, meningkatkan penjualan, dan mengoptimalkan operasi bisnis. Pentingnya strategi pemasaran digital bagi UMKM di Desa Cerme Lor terkait dengan perubahan perilaku konsumen yang semakin terbiasa dengan belanja online. Akan tetapi, pelaku usaha di Desa Cerme Lor belum memiliki pengetahuan tentang strategi yang baik. Pelaksanaan pengabdian ini dilakukan di Desa Cerme Lor yang beralamatkan di Jalan Pasar Cerme Lor No 45, Kecamatan Cerme, Kabupaten Gresik yang dihadiri oleh 20 orang pelaku UMKM. Metode pelaksanaan kegiatan ini yaitu pemaparan materi dengan ceramah, tanya jawab, pelatihan pembuatan logo salah satu UMKM di Desa Cerme Lor, dan evaluasi yang dilihat dari nilai pra dan post test. Dari hasil kegiatan ini didapatkan peningkatan pemahaman tentang strategi digital marketing melalui e-commerce yang dapat dilihat dari nilai rata-rata post test mencapai 85% dari sebelumnya yang hanya mencapai 47,5%. Pemberian logo untuk UMKM Jamu Mbah Rahayu yang telah berdiri sejakn tahun 1950 untuk lebih memperkenalkan produk dan memperluas pasar.
Co-Authors Bambang Sugeng Engkir Sukirman Fauziah, Balqiz Irawan, Ike Fitri Krisna, Agung Dwi Mardiyanto Mardiyanto Masyrofi, Mohammad Iqbal Faza Solihah, Athima Ninatus Syahfandi Ahda Wahyuningtyas, Sri Harnindawati Zulyani, Zulyani