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OPTIMIZATION OF INJECTION MOLDING PARAMETERS TO MINIMIZE SHRINKAGE AND MAXIMIZE TENSILE STRENGTH IN THE RECYCLING PROCESS OF DISPOSABLE FACE MASKS Widyasmoro, Irvan Bayu; Widiastuti, Indah; Estriyanto, Yuyun; Budiyanto, Khansa Qonitatillah
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1518

Abstract

Recycling used face masks into useful products is an alternative way to reduce the accumulation of medical waste during the COVID-19 period. The main objective of this study was to determine the effect of injection molding parameters of barrel temperature, molding temperature, and cooling time on tensile strength and plastic shrinkage during the recycling process of used disposable face masks. The study utilized a Design of Experiment (DoE) using the Taguchi Orthogonal L9 method. In this current study, the barrel temperatures were set at 170oC, 190oC, and 220oC. with the molding temperatures used are 45°C, 60°C, and 75°C, while the values of cooling time were 26s, 43s, and 52s. The tensile test was carried out according to the ASTM D638 type V standard for measuring the strength of materials. The findings demonstrate that the most important factor in achieving the highest tensile strength is the molding temperature, which contributes 34.54% and is best combined with a barrel temperature of 170°C, a molding temperature of 60°C, and a cooling period of 52s. By contributing 54.40% to the parameter combination of barrel temperature of 170°C, molding temperature of 45°C, and cooling time of 52s, the molding temperature becomes the most crucial factor to produce the least amount of shrinkage
Field Work Practice Monitoring System to Support Practical Activities for Vocational High School Students Suparyati, Atik; Widiastuti, Indah; Saputro, Ida Nugroho
JTP - Jurnal Teknologi Pendidikan Vol. 26 No. 2 (2024): Jurnal Teknologi Pendidikan
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat, Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jtp.v26i2.47774

Abstract

Internship (INTERNSHIP) is an important part of the vocational education curriculum in vocational high schools, including SMK Negeri 1 Gesi. However, its implementation often faces various obstacles, such as inefficient communication, delayed reporting, and difficulties in monitoring student progress. To address these issues, an Internship monitoring system has been developed with the aim of optimizing the learning process. Therefore, this research aims to develop a internship monitoring system that is suitable for use by vocational high school students to support their activities. The research method applied in this study is research and development adopting the Alessi & Trollip model. The research subjects include software/media experts, content experts, and teachers. Data collection is carried out using observation, interviews, and questionnaires. The data obtained from the research is then analyzed qualitatively descriptively and quantitatively in terms of percentage. The research results show that in the alpha testing phase, the internship monitoring system product received a High Validity qualification from experts. Based on these results, it can be concluded that the internship monitoring system product deserves the category of  high feasibility to use as an application or system to support a series of internship activities, both for teachers and students.
INTRODUKSI TEKNIK BUDIKDAMBER DAN PENGOLAHAN IKAN ZERO WASTE DI DESA PULAU SEMAMBU INDRALAYA: Tehnik Budikdamber dan Pengolahan Zero Waste Rinto, Rinto; Syaifudin, Mochamad; Taqwa, Ferdinand Hukama; Herpandi, Herpandi; Lestari, Susi; Widiastuti, Indah
Jurnal Pengabdian Kepada Masyarakat Sakai Sambayan Vol. 5 No. 3 (2021)
Publisher : Lembaga Penelitian dan Pengabdian Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jss.v5i3.283

Abstract

Adanya kasus pandemi COVID-19 menyebabkan berkurangnya pendapatan masyarakat Desa Pulao Semambu. Hal ini disebabkan oleh dua faktor yaitu pertama terhentinya berbagai agenda wisata yang dilakukan di Desa Pulau Semambu yang berimbas pada tidak adanya wisatawan yang membeli hasil panen, serta kedua, meskipun masyarakat masih tetap dapat menjual hasil pertaniannya di Pasar Indralaya, namun pandemi COVID-19 juga menyebabkan daya beli masyarakat menurun. Kebijakan pemerintah untuk work from home (WFH) berimbas pada tutupnya sebagian besar rumah makan yang berada di dalam dan di sekitar Universitas Sriwijaya, dikarenakan tidak adanya mahasiswa yang aktif hadir secara langsung sehingga kebutuhan akan sayuran dari Desa Pulau Semambu menjadi menurun. Tujuan kegiatan ini adalah memberikan informasi teknologi berupa budidaya ikan dengan memanfaatkan ruang pekarangan yang terbatas berupa Teknik budidaya ikan dalam ember (BUDIKDAMBER) serta pengolahan ikan berbasis zero waste. Kesimpulan dari kegiatan ini adalah tema kegiatan pengabdian tehnik budikdamber dan pengolahan ikan berbasis zero waste diterima dengan baik oleh masyarakat Desa Pulau Semambu, aktivitas diskusi dan tanya jawab yang berlangsung seru dan menarik. Paket bantuan berupa 5 unit budikdamber dan 5 unit hand sealer sangat bermanfaat untuk pemanfaatan teknologi secara langsung dari materi yang disampaikan dan diharapkan dapat memacu masyarakat untuk dapat mengaplikasikan ilmu/teknologi yang diperoleh.