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All Journal Jurnal Teknik ITS International Journal of Economics, Business and Innovation Research
Ridzky Zul Asdi
Institut Teknologi Sepuluh Nopember Surabaya
Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Engineering

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Kajian Tribologi Gesekan Antara Material Komposit Hidroksiapatit (HA) + Polymethyl Methacrylate (PMMA) dengan Ultra High Molecular Weight Polyethylene (PMMA) sebagai Prosthesis Sendi Rahang (TMJ) pada Manusia Ridzky Zul Asdi; Yusuf Kaelani
Jurnal Teknik ITS Vol 2, No 3 (2013)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (298.161 KB) | DOI: 10.12962/j23373539.v2i3.5108

Abstract

Temporomandibular joint prosthesis serta berbagai macam bentuk dan material sudah cukup banyak diteliti. Namun, sejauh yang penulis teliti, belum ada yang menggunakan Hidroksiapatit (HA) sebagai material utama. Penelitian ini bertujuan untuk mengetahui laju keausan dari material komposit hidroksiapatit (HA) + polymethyl methacrylate (PMMA) serta mekanisme keausan yang terjadi pada permukaannya untuk aplikasi prosthesis. Pengujian keausan dilakukan menggunakan tribometer pin-on-disc dengan material komposit sebagai spesimen pin dan ultra high molecular weight polyethylene sebagai material disc. Variasi yang dilakukan adalah variasi kandungan hidroksiapatit pada material komposit yaitu sebesar 40%, 50%, 60% dan 70%. Pengujian keausan dilakukan pada keadaan tanpa lubrikasi dan dengan lubrikasi menggunakan cairan collagen. Hasil pehitungan densitas menunjukkan bahwa penambahan kadar HA dalam komposit akan menambah nilai densitas. Hasil pengujian keausan menunjukkan bahwa spesimen komposit dengan 40% hidroksiapatit memiliki ketahanan aus paling baik yaitu sebesar 4,16×10-6 mm3/Nm untuk pengujian tanpa lubrikasi dan 3,55×10-6 mm3/Nm untuk pengujian dengan lubrikasi. Penambahan lubrikasi dapat menurunkan besarnya laju keausan sebesar 14%. Pengamatan permukaan kontak menunjukkan bahwa mekanisme keausan yang terjadi adalah kombinasi antara keausan adhesif serta abrasif.
A Comprehensive Analysis of Building Construction Projects’ Delay Using the Analytic Network Process Asdi, Ridzky Zul; Utomo, Dutho Suh
International Journal of Economics, Business and Innovation Research Vol. 4 No. 01 (2025): International Journal of Economics, Business and Innovation Research( IJEBIR)
Publisher : Cita konsultindo

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Delays in construction projects have emerged as a significant challenge due to their profound impact on costs, quality, and project timelines, all of which ultimately affect the overall success and completion of the project. The primary objective of this study is to identify the factors contributing to delays in building construction projects and to quantitatively assess the extent to which each of these factors influences project delays. To achieve this, a quantitative impact analysis of each identified factor is conducted using the Analytic Network Process (ANP). Five key factors have been identified as major contributors to project delays: design or specification changes, material procurement delays, adverse weather conditions, regulatory and permitting issues, and unforeseen risks. Among these, material procurement delays emerged as the most significant contributor, accounting for 36.13% of the total delay impact. This is followed by design or specification changes, unforeseen risks, regulatory and permitting issues, and adverse weather conditions. Further research is required to develop effective preventive measures to mitigate these delays and enhance project management practices.
Co-Authors Dutho Suh Utomo Yusuf Kaelani