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Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran
Published by Universitas Negeri Semarang
ISSN : 02165631     EISSN : 25276964     DOI : https://doi.org/10.15294/rekayasa
Core Subject : Engineering,
Engineering
REKAYASA journal publishes exciting articles from all fields of research and Engineering Science. The journals primary focus is on research practice and engineering processes utilizing biomass or factory waste. The engineering journal is an open-access peer-reviewed journal that publishes articles from all areas of Engineering and Science research.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol 19, No 1 (2021): July 2021" : 5 Documents clear
Steam Boiler Technology for Making Soybean Porridge without Smell of Wood Burning Smoke o Tofu Production Saputro, Danang Dwi; Sunyoto, Sunyoto; Wicaksono, Dimas; Fibrianti, Nurul
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 19, No 1 (2021): July 2021
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v19i1.30330

Abstract

Small industries that make tofu indirectly experience problems in the soybean porridge cooking process. This porridge is the forerunner of tofu. Tofu Serasi Asli product senses an annoying situation to the environment and the development. Furthermore, it is divided into problems of production and management aspects. The boiler design shows that separating the steam production from the pan by flowing saturated steam in each soybean plot. The advantages of using a steam boiler are that the cooking pan does not produce scale and saves time, increases capacity, higher pressure reaches 300 kPa and creates smoke-free kitchen space and a healthier and more hygienic production kitchen. Fuel savings of 48%, an increase in the income of small and medium enterprises and the quality of the tofu produced is better and does not smell of burning smoke.
Design and Performance of The Raspberry Pi Control System on Packaging Machine Capacity 2400 Pcs/h Kriswanto, Kriswanto; Karsan, Karsan; Al-Janan, Dony Hidayat; Roziqin, Ahmad; Hangga, Arimaz; Fathoni, Khoirudin; Wijayanto, Bagus
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 19, No 1 (2021): July 2021
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v19i1.28699

Abstract

Technology Development in the era of industry 4.0 is characterized by the use of automatic technology machines. But in small and middle-scale industries still use the conventional machine. Low-cost packaging machines need to be developed by utilizing the Raspberry Pi control system. The purpose of this research is to design, produce, and test the performance of powder packaging machines with the Raspberry Pi control system. This research uses an experimental research model with observational techniques in the form of a performance test. This research resulted in the design of the Raspberry Pi control system on a powder product packaging machine with a capacity of 240 pcs/hour. Based on the results of the control system performance test, it was found that the packaging was running well and consistent. From the rotation and stop pause of the stepper motor which has been set, it produces an average weight of the packaging and its contents weigh 13.737 grams. The difference in weight of the average product with the highest weight and the lowest weight is 0.063 grams and 0.057 grams. With a difference of less than 0.1 gram, it indicates that the weight resulting from packaging sugar products is good and consistent. In the pressing process, the temperature sensor takes temperature readings correctly, so that the heater can reach the press temperature of 1500C. Based on the trials and calculations that have been done, it is obtained 2,640 packages within 1 hour. This amount fulfills the initial target of designing a powder product packaging machine with Raspberry Pi control.
Eye Fatigue Detection in Vehicle Drivers Based on Facial Landmarks Features Fikriyah, Fia Dumi Hasanatul; Nugroho, Anan; Suni, Alfa Faridh
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 19, No 1 (2021): July 2021
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v19i1.30993

Abstract

Human factors are unavoidable in traffic accidents, so early detection is needed. Fatigue while driving can be interpreted as drowsiness or nervous breakdown. Therefore, vehicle drivers must be able to increase their vigilance. The occurrence's cause is mainly human negligence due to tired driving. When the body feels tired, it is difficult to stay awake and focus. For this reason, this study was undertaken to propose a comprehensive approach to explore parameters indicating eye fatigue or driver drowsiness.. Detection of eye fatigue in vehicle drivers uses a smartphone camera (droid cam) to acquire and detect the driver's eyes using face recognition. This application development uses OpenCV with the Python programming language. This research was conducted by detecting faces using the facial landmarks 68 algorithms and then looking for points around the eyes to calculate the eye aspect ratio. The results of the detection analysis on the eyes when open and closed indicate the rider's size is tired and buggy. The input from the program is the number of blinks of the rider's eyes every minute so that the quantity indicates the driver is tired, sleepy or fit. This figure indicates that motorists are sleepy and need to anticipate taking a short break to continue the journey later.
Modification Monitoring of Combustion Chamber Temperature and Pressure on Diesel Engines Juna, Haidir; Nufus, Tatun Hayatun; Maksum, Ahmad
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 19, No 1 (2021): July 2021
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v19i1.30371

Abstract

Along with the development of technology in the industry, especially automotive, professional workers who are reliable and master their fields in theory and practice are expected. Ideally, educational institutions such as polytechnics should provide adequate equipment and facilities to achieve learning objectives. A critical process in the combustion engine system is where a cycle of pressure and temperature changes at each piston stroke. Unfortunately, many students' understanding of the diesel engine cycle system still needs to be improved, even though the diesel engine cycle had been discussed in the engine system course or thermodynamics. Therefore, this study was intended to modify the Diesel Engine in the heavy equipment workshop to be used as a learning media for the combustion engine and thermodynamic, especially the diesel cycle. This research started with identifying and preparing to identify and to prepare equipment and materials, installing pressure and temperature sensors, controller installation, calibration, and final testing. The test results show the correspondence between the theoretical and experimental cycles, although a few typical differences usually occur between theoretical and practical in the field.
Bactericidal Activity of Resin-Titanium Dioxide and Ultraviolet in Killing Escherichia Coli Bacteria Budiprasojo, Azamataufiq; Erawantini, Feby
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 19, No 1 (2021): July 2021
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v19i1.30329

Abstract

Escherichia coli (E.Coli) harms the environment in human digestion. E coli causes diarrhoea if one consumes food or drink that is not clean or exposed to bacteria. This research aims to produce a specimen that combines resin coated with TiO2 and partly ultraviolet light to kill Escherichia coli bacteria. The method used in this research is experimental. The activity in this research is mixing TiO2 nanomaterial with resin, then varying the time and exposure to ultraviolet radiation. Furthermore, observations were made by comparing the number of bacteria found in the two specimens with SEM. Specimens were analyzed using digital image processing. The appearance of the white capsule is the bacteria. The grey bottom is the specimen conclusion in this study was that the TiO2 (titanium dioxide) and resin specimens and modified ultraviolet radiation were quite effective in killing E.coli which achieved a 91% reduction in the number of bacteria.

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