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All Journal Jurnal Pengelolaan Laboratorium Pendidikan Jurnal RESISTOR (Rekayasa Sistem Komputer)
Yogasmana, Yopi
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Computer Science & IT Education Electrical & Electronics Engineering Energy Engineering

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Journal : Jurnal Pengelolaan Laboratorium Pendidikan

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Laser Auto Level In Lathe Life Center untuk Meningkatkan Kinerja Mesin Bubut di Laboratorium Teknik Pemesinan Yogasmana, Yopi; Barmana, Doni
Jurnal Pengelolaan Laboratorium Pendidikan Vol.6, No.1, Januari 2024
Publisher : UPT Laboratorium Terpadu, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jplp.6.1.41-46

Abstract

The performance of a lathe in the turning process is greatly influenced by the components in the lathe itself such as the fixed head, removable head, rotating center, lathe tool, drill chuck and center drill. Reduced lathe performance can cause lathe failure. The incision made by the lathe chisel on the workpiece will determine the result of the turning work. The cylindricity/flatness of the workpiece results from the parallelism of the lathe tool and the workpiece axis. If the lathe tool is not parallel to the workpiece axis, it will produce a workpiece that is oval (not cylindrical) or has an uneven surface. In aligning the lathe tool on the workpiece axis, you must first bring the lathe tool closer to the end of the rotating center, which sometimes takes quite a long time. Laser Auto Level in Lathe Life Center (LAL3C) is a hand tool that functions to make it easier to align the lathe tool on the workpiece axis as an effort to improve the performance of the lathe machine. The research results show that using LAL3C can make it easier to align the lathe tool on the workpiece axis and can shorten the time.
Pengolahan Limbah Laboratorium Kimia Secara Organik Menggunakan Kitosan dan Ekstrak Daun Abelmoschus dalam Kegiatan Praktikum Rohana, Hana; Dzulummah, Zakiah; Yogasmana, Yopi
Jurnal Pengelolaan Laboratorium Pendidikan Vol. 7 No. 2, Juli 2025
Publisher : UPT Laboratorium Terpadu, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jplp.7.2.112-121

Abstract

Laboratory wastewater is hazardous to health and the environment; therefore, it must be treated correctly and precisely. Wastewater treatment involves coagulation and flocculation processes. Mostly, chemicals used as coagulants or flocculants are expensive and if used for a long time, they will damage the environment. In this study, wastewater treatment was carried out with environmentally friendly organic materials, namely using chitosan and Abelmoschus leaf extract. The aithis research was to examine the effectiveness of organic waste processing using chitosan and Abelmoschus leaf extract in relation to turbidity values. The research began with the optimization parameters (pH, coagulant/flocculant dosage, rate and stirring time) carried out using the Jar test. Optimum parameters were obtained from the lowest turbidity value for each parameter. From the research results, it was obtained that the optimum parameters were: pH 6.5; coagulant dose 400 mg/L; flocculant dose 105 mg/L; coagulant and flocculant stirring rate 50 rpm and 30 rpm; coagulant flocculant stirring time 12.5 minutes and 10 minutes.The optimum parameters applied to wastewater treatment. The results indicate that turbidity value in the wastewater before processing is an average of 359 NTU and the turbidity value after processing is an average of 13.31 NTU.To confirm the results of the study, statistical tests were carried out on the samples. It is resulting there was a significant level difference due to the addition of chitosan and Abelmoschus leaf extract.
Co-Authors Apri Wiyono Barmana, Doni Dzulummah, Zakiah Ega Taqwali Berman Hana Rohana, Hana Kamin Sumardi Mutaufiq, Mutaufiq