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All Journal Yustisia Unifikasi: Jurnal Ilmu Hukum Jurnal IUS (Kajian Hukum dan Keadilan) Al-Adalah: Jurnal Hukum dan Politik Islam AL-Ishlah : Jurnal Ilmiah Hukum RIO LAW JURNAL IBLAM Law Review Journal of Lex Theory (JLT) Journal of Lex Philosophy (JLP) Innovative: Journal Of Social Science Research Golden Ratio of Law and Social Policy Review (GRLSPR) Qawanin Jurnal Ilmu Hukum Yarsi Dental Journal Vifada Assumption Journal of Law HORIZON PUBLIC LEGAL STUDIES ADVANCED PRIVATE LEGAL INSIGHTS
Abbas, Ilham
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Humanities Computer Science & IT Dentistry Environmental Science Law, Crime, Criminology & Criminal Justice Public Health Social Sciences Other

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The RENDEMEN HIDROKSIAPATIT DARI TULANG IKAN CAKALANG (Katsuwonus pelamis) DENGAN LAMA WAKTU 12, 24, 36, 48 JAM DENGAN METODE PRESIPITASI Syam, Syamsiah; Febriany, Mila; Mattulda, Indrya Kirana; Husein, Husnah; Abbas, Ilham
YARSI Dental Journal Vol. 3 No. 2 (2026): YARSI DENTAL JOURNAL
Publisher : Lembaga Penelitian Universitas YARSI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33476/ydj.v3i2.308

Abstract

Background: Skipjack tuna (Katsuwonus pelamis) bone waste in South Sulawesi has high potential as a natural hydroxyapatite (HA) source due to its calcium–phosphate content. However, the effect of precipitation duration on HA yield and phase composition remains unclear. Research Objective: To evaluate the effect of precipitation time (12, 24, 36, and 48 hours) on hydroxyapatite yield and phase composition from skipjack tuna bone. Methods: Experimental laboratory study using precipitation method. Bone-derived CaO was reacted with 0.6 M H₃PO₄ under controlled pH using NaOH 1 M. The precipitate was aged for 12–48 hours, dried, calcined, and weighed to determine yield. Phase composition was analyzed using XRD. Results: The highest yield was obtained at 24 hours (97.807%). Longer durations (36 and 48 hours) reduced yield. XRD showed Whitlockite dominance at 12 hours (84.5%), increased Hydroxyapatite at 24 hours (46.1%), Whitlockite re-dominance at 36 hours (50.4%), and Fluorapatite dominance at 48 hours (49.7%). Conclusion: A 24-hour precipitation time produced the highest HA yield with balanced phase composition. Prolonged precipitation altered mineral phases and reduced efficiency.
Balancing State Revenue and Fair Competition in Social Commerce Platforms Abbas, Ilham; Ramadani, Rizki
Yustisia Vol 14, No 2: August 2025
Publisher : Faculty of Law, Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/yustisia.v14i2.93969

Abstract

Indonesia's growing population has contributed to the expansion of e-commerce, but state revenue stagnates. Meanwhile, social commerce platforms have created harmful rivalry, threatening MSMEs' sustainability. The study seeks to identify legal issues in social commerce platforms, including taxation and fair competition, and provide a regulatory framework that maximizes digital sector state revenue while protecting domestic firms. This study uses legal research methodology, focusing on a statutory and comparative approach. The finding reveals that insufficient tax compliance among e-commerce participants, inadequate oversight of foreign social commerce businesses, and predatory pricing practices are the main causes of structural inequality.  Additionally, uneven government policies reduce domestic enterprises' competitiveness.  This study recommends mandating foreign social commerce platforms to establish a permanent presence in Indonesia to comply with national tax regulations, allocating a minimum of 30% of social commerce tax revenues to empower MSMEs and support digitalization programs, implementing cross-ministerial big data monitoring for transaction oversight, and strengthening the Business Competition Supervisory Commission to combat predatory behavior. A comprehensive regulatory reform is expected to balance governmental interests, MSMEs, and the global digital economy.
Co-Authors Abd Rahman Aditya Halim Perdana Kusuma Putra Putra Alfathan, Andy Reza Ali, Achmadi Andairah, Nur Asjaksan, Nur Rahma Aslamiah, Dian Aswari, Aan Ayu, Putri Azis, Muawanatul Azzahra, Adeliya Bima, Muh. Rinaldy Bustam, Ridwan Fahmal, A Muin Fajriyah, Laeli Faradikta, Religia Febriany, Mila Hafidz, Ma'ruf Hardana, Ariel Putra Hardianto Djanggih, Hardianto Herlina Herlina Hidayat, Andi Muh. Taufik Hidjaz, M. Kamal Hidjza, Kamal Husein, Husnah Husen, La Ode Husen, Lao De Isnawanti, Isnawanti Kharismawati, Kharismawati Maesaroh Haris, Faradhilla Ayun Mais, Andi Farhan Maulana Mamonto, Moch. Andry Wikra Wardhana Marikar, Marikar Mattulda, Indrya Kirana Muhammad Fachri Muhammad Kamal Muhammad Rinaldy Bima Muhdar, Muhammad Zulkifli Mustapa, Andi Nawi, Syahruddin Patta, Hasnawati Pawennei, Mulyati Prawira Buana, Andika Putri, Ilma Aulia Rahman, Sufirman Ramadani, Selyana Fitri Ramadhan, Fariza Raya, Media Imas Risma, Andi Riswandar, Muhammad Rafli Rizal, Andi Muhammad Rizki Ramadani S. Sugiharto Sahrani, Nanda Sari, Ria Novika Subhan, Akhmad syahrul, muhammad Syaiful . Syam, Nurul Sofia Syamsiah Syam, Syamsiah Tamsil, Andi Muhammad Ikram Thalib, Hambali Wahyudi, Candra Zulkifli Muhdar, Muhammad