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All Journal (JIML) JOURNAL OF INNOVATIVE MATHEMATICS LEARNING Tedc
Novita, Tita
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The Effectiveness Of Application Of Mind Mapping Learning Models On The Problems Of The Story Viewed From The Mathematic Communication Ability Of Vocational School Student Novita, Tita
(JIML) JOURNAL OF INNOVATIVE MATHEMATICS LEARNING Vol 3, No 2 (2020): VOLUME 3 NUMBER 2, JUNE 2020
Publisher : IKIP Siliwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22460/jiml.v3i2.p72-76

Abstract

This article presents research on the effectiveness of learning using mind mapping learning models and experimental research methods with a pre-experimental design: one-shot case study design using purposive sampling, for vocational students of class XI in the academic year 2019/2020 on mathematical questions in the form of story questions. the purpose of this study is to describe the effectiveness of students' mathematical communication skills using mind mapping learning models, obtain a number of student problems in the process of communicating the form of mathematical problem problems with the form of story problems. Based on the analysis of the data obtained by the results of research at the destination school shows that the percentage of students who have good mathematical communication skills of students is less than 70%. Thus in the form of story questions, mind mapping learning models are not effective in terms of students' mathematical communication skills
PENENTUAN WAKTU PADA PERGERAKAN ELECTRIC SPRAY GUN UNTUK PROSES PENGECATAN POWDER COATING Sjahrul, Yurika; Novita, Tita
Jurnal TEDC Vol 19 No 2 (2025): JURNAL TEDC
Publisher : UPPM Politeknik TEDC Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70428/tedc.v19i2.1250

Abstract

Powder coating is a painting process used to coat metal surfaces, providing a more durable and aesthetically pleasing finish compared to conventional painting. This method falls under the category of dry finishing, where the coating material is in the form of a fine powder consisting of a mixture of resin, color pigments, and other additives. The powder is electrostatically charged to adhere strongly to the cleaned metal surface. The coating process is carried out by spraying the powder using an electric spray gun, followed by a heating or oven curing process to melt and bond the powder permanently onto the metal surface. In an automated powder coating system, the movement of the electric spray gun and the metal object being coated is crucial to ensure uniform thickness and coating quality. For this purpose, two types of motors are used: a continuous rotation servo motor to rotate the object holder, and a DC motor to move the electric spray gun linearly. Both motors are controlled by an Arduino Uno microcontroller, which acts as the main control center, and an Omron CP1E PLC, which manages the overall industrial process control logic. The speed and movement time of the DC motor significantly affect the spray coverage distance. Based on testing, to reach a distance of 25 cm, the DC motor requires 3325 ms at a speed of 0.075 m/s. For a distance of 20 cm, the required time is 2670 ms, while for 15 cm, the motor runs for 2005 ms. These time calculations are essential to ensure that the metal surface area receives sufficient and even powder spray. With this system, the coating process can be performed automatically, efficiently, and consistently according to the programmed parameters.
Co-Authors Sjahrul, Yurika