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All Journal Indonesian Journal of Multidiciplinary Research (IJoMR) Makara Journal of Science
Iza, Nurlaely Rohmatul
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Chemical Engineering, Chemistry & Bioengineering Education Engineering Social Sciences Other

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Structural Design and Strength Analysis of Lifting Machine for Home Appliance Flood Safety Tool: A Problem-based Learning Sineri, Gabriel Ayrton Andares; Octary, Astrid Vanya; Ali, Muchammad Fachrizal; Iza, Nurlaely Rohmatul; Triawan, Farid
Indonesian Journal of Multidiciplinary Research Vol 1, No 2 (2021): IJOMR: VOLUME 1, ISSUE 2, 2021
Publisher : Universitas Pendidikan Indonesia (UPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (585.681 KB) | DOI: 10.17509/ijomr.v1i2.35122

Abstract

In Indonesia, floods become an annual disaster, especially in the rainy season. The number of floods occurs in Indonesia in 2019 reached 1,277 cases. The floodwater can cause massive damage to the home appliance, especially when contacted with electronic devices. Moreover, the lifting machine comes as an excellent solution, securing the electronic device when floods come. A preliminary design of a hydraulic scissors lifter for elevating the home appliance during floods is introduced along with its static and fatigue strength analyses. The proposed design comes up with a combination of scissors lifter mechanism combined with the hydraulic jack device. The analyses in the critical components of the lifting machine - the support link and the scissors rod link - are presented. The lowest and upper conditions are assumed and resulted in a dynamic safety factor of 1.252 for the lowest position and 3.11 for the highest position. These values indicate that the proposed design offers excellent safety. Additionally, this work can be classified as teaching material for the machine element course.
Poly(2-Hydroxyethyl Methacrylate) Hydrogels for Contact Lens Applications–A Review Saptaji, Kushendarsyah; Iza, Nurlaely Rohmatul; Widianingrum, Sinta; Mulia, Vania Katherine; Setiawan, Iwan
Makara Journal of Science Vol. 25, No. 3
Publisher : UI Scholars Hub

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Abstract

The emerging technology in biomedical engineering requires biocompatible materials, which are also referred to as biomaterials. For a material to be considered biocompatible, it should not interact with human tissues in a harmful way, and vice versa. Various properties of biocompatible materials, such as mechanical and optical properties, have to be considered for different biomedical applications. One of the most popular applications of biomaterials is for contact lenses. Hydrogels, specifically poly(2-hydroxyethyl methacrylate) (PHEMA) hydrogels, are among the most popular ones in ophthalmologic applications, especially in soft contact lenses. This paper reviews the use of PHEMA hydrogels as one of the important biomaterials. The possible applications, properties, and manufacturing process of PHEMA hydrogels, especially in contact lens applications, are addressed. Many studies have shown that PHEMA hydrogels possess many advantages in contact lens applications and have promising development prospects.
Co-Authors Ali, Muchammad Fachrizal Iwan Setiawan Mulia, Vania Katherine Octary, Astrid Vanya Saptaji, Kushendarsyah Sineri, Gabriel Ayrton Andares Triawan, Farid Widianingrum, Sinta