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All Journal Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Indonesian Physical Review
Putri, Rezky Meyvia
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Computer Science & IT Education Engineering Physics

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Strategi Manajemen Rantai Pasok untuk Meningkatkan Kinerja on-Time in Full dan Order Fulfilment Cycle-Time PT XYZ Putri, Rezky Meyvia; Leksono, Vridayani Anggi
Prosiding Sains Nasional dan Teknologi Vol 14, No 1 (2024): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 2024
Publisher : Fakultas Teknik Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36499/psnst.v14i1.12001

Abstract

PT XYZ Cabang Balikpapan adalah perusahaan manufaktur dan teknik alat berat. Penelitian ini bertujuan untuk mengoptimalkan kinerja Supply Chain Management (SCM) di perusahaan tersebut dengan menggunakan Metode Supply Chain Operation Reference (SCOR). Data penelitian diperoleh dari divisi marketing & sales, khususnya pada proses Program Tukar Alat (PTA) dengan skema Flat Rate & Surcharge tahun 2023. Hasil penelitian menunjukkan bahwa kinerja On Time In Full (OTIF) di Balikpapan belum optimal, dan Order Fulfillment Cycle Time (OFCT) sering mengalami penundaan pengiriman. Untuk meningkatkan kinerja, PT XYZ Cabang Balikpapan perlu mengutamakan efisiensi perencanaan operasional dan melakukan audit menyeluruh pada setiap tahapan untuk mengurangi keterlambatan pengiriman.
SYNTHESIS OF BIOMATERIAL-GRADE WHITLOCKITE FROM CRAB SHELL WASTE: AN ECO-FRIENDLY APPROACH Khumaera, Rahmatia; Sirait, Maria Diva Yuniar; Rahim, Muhammad; Putri, Rezky Meyvia; Sumual, Theofilus Ariel; Musyarofah, Musyarofah
Indonesian Physical Review Vol. 8 No. 1 (2025)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v8i1.403

Abstract

Crab shells, rich in calcium carbonate (CaCO3), provide a sustainable source of calcium oxide (CaO) for synthesizing Whitlockite (WH, Ca9(MgFe)(PO4)6PO3H), a potential biomaterial for bone replacement. This study addresses prior research gaps by exploring synthesis temperature variations from 700℃ to 1000℃  and employing acid precipitation to yield high-purity WH. Characterization was performed using Fourier Transform Infrared (FT-IR), X-ray Diffraction (XRD), X-ray fluorescence (XRF), Scanning Electron Microscopy (SEM), and Brunauer Emmet-Teller (BET) analysis. Results indicate that the crab shell powder contains 99.0944%wt. The XRD results show that optimal crystallinity and purity of WH were achieved at a calcination temperature of 900℃.  The FTIR test results show that the functional groups of WH at calcination temperatures of 700℃, 800℃, 900℃, and 1000℃ for 5 hours are detected in specific wave ranges, namely PO₄³- (673-671 cm-¹), and OH- (3340-3198 cm-¹), which contribute to the bone formation process. SEM tests revealed that changes in calcination temperature affected the morphology of WH, with the optimal temperature producing a smaller size, minimal agglomeration, and a more uniform size distribution. BET analysis showed that 900℃ gave the highest adsorption capacity and good stability, indicating a more significant potential for interaction with body cells. These findings confirm the ability of WH to be a promising biomaterial for bone replacement applications.
Co-Authors Khumaera, Rahmatia Leksono, Vridayani Anggi Musyarofah Musyarofah, Musyarofah Rahim, Muhammad Sirait, Maria Diva Yuniar Sumual, Theofilus Ariel