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JOURNAL OF SCIENCE AND APPLIED ENGINEERING
Published by Universitas Widyagama
ISSN : 26213753     EISSN : 26213745     DOI : -
Core Subject : Science, Education, Social, Engineering,
Aerospace Engineering Computer Science & IT Electrical & Electronics Engineering Engineering Social Sciences Other
ournal of Science and Applied Engineering (JSAE) is an open access peer-review journal, and is aimed to disseminate original research in all fields of Electrical Engineering, Mechanical Engineering, Civil Engineering, Industrial Engineering and Informatics Engineering and presents the latest development and achievements in scientific research in Indonesia and overseas to the world’s community. Only original, innovative and novel papers will be considered for publication in the JSAE. The authors are required to confirm that their paper has not been submitted to any other journal in English or any other language. The JSAE welcome contributions from all who wishes to report on new developments and latest findings in science and applied engineering.
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Articles 81 Documents
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Heat Flux Condensation on Coconut Shell Activated Charcoal Porous Media Djoko Hari Praswanto; Mochtar Asroni; Thomas Priyasmanu; Tutut Nani Prihatmi
JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 3, No 2 (2020): JSAE
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jsae.v3i2.1770

Abstract

One way to keep the air humidity is by increasing the heat transfer with the porous media model. Increasing heat transfer depends on the value of the heat flux on the porous media. The heat flux value can be determined by inserting the porous media into the test section and then flow the vapor. The amount of heat absorbed is influenced by the large diameter of the porous on the media used. Therefore, this study aimed to optimize coconut shell charcoal by activating the charcoal. The purpose of activating coconut shell charcoal is to enlarge the pores so that it absorbs heat better than charcoal that has not been activated. The research method used is an experimental method and compares the results of research with previous studies. The porous media was vaporized for 60 minutes with a vapor temperature of 30 °C, while the vapor speed was varied, namely 1 m/s, 2m/s and 3 m/s. From the research results, that by using coconut shell activated charcoal, the heat flux value was higher than using coconut shell charcoal media. This is because the pore size in activated charcoal is larger and more numerous than charcoal that has not been activated so that it absorbs more heat. In addition, the greater the vapor speed, the higher the heat flux, because in the test section more vapor enters than vapor that comes out so that the porous media has a long time to absorb heat in the vapor. The heat transfer that occurs in porous media includes forced convection heat transfer because it has a value of Gr/Re2 < 1.
Comparative Analysis Of Mechanical Properties Of Rubber-Kenaf-Wire-Cotton Lamination On Epoxy-Carbon-Ramie Composite I Komang Astana Widi
JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 3, No 2 (2020): JSAE
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jsae.v3i2.1611

Abstract

The use of fiber has been widely researched but the use of several fibers as reinforcement does not necessarily result in optimal mechanical properties. This study aimed to determine the tensile strength and impact strength of composite materials using an epoxy matrix with the addition of rubber variations to increase the ductility of the matrix. Meanwhile, the fibers used for reinforcement are carbon fiber and ramie. In this study, the reinforcement added a variety of kenaf fiber, wire and cotton. This was to compare the role of kenaf fiber, wire and cotton in improving the mechanical properties of composite materials. The percentage of rubber volume fraction added to the epoxy is 30%, 40% and 50%.The highest tensile test results were shown in the 30% epoxy rubber-carbon fiber-ramie fiber-kenaf specimen which was 10.67 Kgf / mm2, and the lowest result was the epoxy 50% rubber-carbon fiber-ramie-wire specimen, which was 5.752 kgf / mm2. The fracture analysis of the tensile test showed that the fracture area is formed by debonding phenomena between fibers and matrices.The highest impact strength was found in the 50% epoxy rubber-carbon fiber-ramie-wire specimen, which was 0.039 kgf / mm2. Meanwhile, the lowest impact strength was found in the 40% epoxy rubber-carbon fiber-ramie fiber-cotton specimen, which was 0.030 kgf/ mm2. In general, the trend of impact test data shows that as the percentage volume fraction of rubber increases, the impact strength of the composite material increases.Based on the test analysis, it was concluded that increasing the percentage of rubber will increase the impact strength of the woven wire reinforcement. However, the impact strength is inversely proportional to kenaf fiber reinforcement, where the addition of the percentage of rubber will reduce the impact strength. This showed that the mechanical properties were not always influenced by the percentage of rubber but were very dependent on the type of fiber. This was also shown in the results of the tensile strength test. In general, it was known that the adhesion between fiber and matrix laminates affected the mechanical properties in addition to the strength of the reinforcement.
The Utilization Of Cocopeat As Environmentally Friendly Composite Soeparno Djiwo; E.Y. Setyawan; D.H Praswanto; T.N. Prihatmi; D. Hermawan
JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 3, No 2 (2020): JSAE
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jsae.v3i2.2156

Abstract

The purpose of this study was to find environmentally friendly-based composite materials by utilizing natural materials that have been underutilized. The environmentally friendly composite is biodegradable which means that if it is not used it can decompose and will not affect or damage the environment. Not all natural ingredients are environmentally friendly; this depends on the application of the material. Composites made from cocopeat utilization can be applied to broad technical requirements. The maximum composite tensile strength test results were 13,473 MPa obtained in composites with 60% matrix with 40% coconut powder, shape and size using ASTM D638-3 and average impact strength 0,00994 J/mm2 obtained from composite 60% matrix with coconut powder 40 % the shape and size using ASTM D790-3, the process of using hand lay up. Adding a polyester matrix to the composite can increase the mechanical strength of the composite. On the other hand, excessive coconut powder in the mass fraction composite will reduce its mechanical strength. The observation of SEM photos in coconut powder shows the pores that can be used further to tie more matrices and able to increase the mechanical strength of the coconut powder composite.
Performance of Reinforced Concrete Beam with Polystyrene Blocks at Various Regions Lim Yong Tat
JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 3, No 2 (2020): JSAE
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jsae.v3i2.1655

Abstract

Lightweight materials, such as polystyrene, can be embedded in reinforced concrete (RC) beams to reduce its weight. However, this may, to some extent, affect the performance of the structure. This research investigates the behaviour of the lightweight beams under load and determines the best position of polystyrene blocks in beams. Nine specimens with a size of 175 mm x 300 mm x 1600 mm were tested under four-point load test. The number and position of polystyrene blocks in the beams were varied. The specimens were evaluated for effectiveness in terms of effective strength to weight ratio (s-w ratio). The lightweight beam was effective when the polystyrene blocks were placed at the neutral and tensile region, offering an s-w ratio of greater than 1. The beam lost 3.8% strength with 8.4% reduction of weight.
Hospital Waste Management through Green QFD Implementation Rudy Joegijantoro
JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 3, No 2 (2020): JSAE
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jsae.v3i2.2163

Abstract

Based on case studies conducted in various health institutions, the high production of medical waste is one proof that medical waste management is still problematic. This study examines various problems in the field of medical waste management. This study explores staff perceptions of medical waste management. This study aims to determine the level of knowledge and attitudes as well as the role of health workers on medical waste management. Here we study the quality index and environmental index of two health care centers, one is a private hospital and one is a government hospital and compared these two indices with each other via a questionnaire survey. To produce more environmentally friendly services, customers, and environmental criteria must be considered during the decision-making process, and the Implementation of Green QFD (G-QFD) provides a very useful methodology to meet this goal.
Landslides Risk Analysis on Pacitan – Ponorogo National Road Section of East Java Province Achmat Insana Masruchi Indroyono; Aji Suraji; Agus Tugas Sudjianto
JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 4, No 2 (2021): JSAE
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jsae.v4i2.3050

Abstract

Landslide is a natural event that at this time the occurrence is increasing. Landslide natural disasters can occur due to land use patterns that do not follow the rules of environmental sustainability, such as deforestation and the collection of natural resources that exceed their carrying capacity. This research was obtained that the threat, vulnerability of landslides on the national road section of Pacitan - Ponorogo obtained from the results of risky analysis is a very high risk. The result of the risk of very high level of Landslide is found at km 13+900 - 14 +000, km 12+500 - 12+600, km 27+201 - 28+051, km 27+200 - km 27+300, km 33+300 - 33+500, km 12+500 - 13+500. The level of Landslide risk on the Pacitan – Ponorogo National road is very varied, some are medium risk, medium risk, high risk to very high risk. Landslide handling techniques on the National road section of Pacitan - Ponorogo to be more effective and efficient because the conditions and value of Landslide risk are different, it will be better to handle in accordance with the level of Landslide risk in each location.
Mechanical Properties of Polyester Matrix Composites with Carbon Hybrid Reinforcement and Woven Wire Gerald Adityo Pohan
JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 4, No 1 (2021): JSAE
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jsae.v4i1.2281

Abstract

This study is aimed to determine the mechanical properties of composite materials using hybrid reinforcing materials, namely carbon fiber and woven wire. The variations in the composition of the matrix / carbon fiber / woven wire (in%) used were 70/0/30, 70/30/0, 70,20 / 10, 50/30/20. The mechanical tests performed were the tensile test (ASTM D 638-03) and the impact test (ASTM D 6110). The results show that the composites with the composition 50/30/20 have the highest tensile and impact strength. Specimens with the highest carbon fiber content have better tensile strength.
Recycling Oil Palm Industry Waste: Sustainable Solid Waste Treatment Utilizing Bioconversion Agent Leo Hutri Wicaksono; M G Arrahim; A. R. Fadhillah
JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 4, No 2 (2021): JSAE
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jsae.v4i2.3051

Abstract

Oil palm is one of Indonesia's most important crops. Indonesia produces 47.180 million tonnes of CPO from an area of 14.858.300 hectares. When there are a lot of CPOs, it suggests there are a lot of wastes. EFB (Empty Fruit Bunch) is a significant biomass by-product of the oil palm industry. These cellulosic materials are relatively inexpensive feedstocks for ethanol synthesis and have no problem with the food supply because they are abundant and outside the human food chain. The principal by-product of the palm kernel oil extraction process is palm kernel meal (PKM). It's a high-fiber, medium-protein feed that's best suited for ruminant or rabbit consumption. EFB was once utilized as a fuel to generate steam at mills, whereas PKM was recycled into animal feed. Another option is to use bioconversion to control these wastes. The Black Soldier Fly (Hermetia illucens) larval (BSFL) is a worldwide insect whose larvae are notable for their capacity to eat a variety of organic wastes. The BSFL were housed in a container and fed EFB and PKM. There were two different treatment options (3 replication per treatments). Each treatment contained 200 larvae and 400 grams of food. The research lasted 18 days. The larvae were collected on the 18th day, and container were measured. Treatment 1 (EFB) have average 9,46% waste consumption, and Treatment 2 (PKM) have 23,14% waste consumption on average.
Industrial Waste Treatment Management: A Review Elkana Timotius; Galuh Sukmarani
JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 4, No 1 (2021): JSAE
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jsae.v4i1.2400

Abstract

Industrial development is hand-to-hand with economic growth. It has a positive impact on many economic sectors and human living, but also produces hazardous waste which giving a negative impact on the environment and human health. Industrial wastes have a high contribution to climate changes, many human diseases, a mutation on animals and plants. Recently, there are many methods to overcome industrial waste include physical, chemical, and biological treatment. Moreover, waste management also is developed to optimize the treatment using 3R (Reduce, Reuse, and Recycle) and WTE (Waste to Energy). Therefore, this paper tried to discuss many technologies for industrial waste treatment and management includes recent research, benefit, and drawback.
Analysis of Factors Affecting Industrial Engineering Students' Learning Interest in the Online Lecture System Sarbini Sarbini; M. Baidawi
JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 4, No 2 (2021): JSAE
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jsae.v4i2.3052

Abstract

The COVID-19 pandemic has forced universities, lecturers, and students to suddenly migrate from face-to-face learning to online learning. in early 2020 these three components must adapt to the situation, but after 2 semesters of adaptation had taken place, the factors that influenced students in attending online lectures are the factor of lecturers and students’ adaptability to the software used, the factor of phone signal in the area where the students live, and the factor of limited funds for data. These factors will affect the students’ comfort factor and shape their interest in the online learning system. This research used a sample of Industrial Engineering students to produce the factors that influence learning interest in the online system. From the descriptive data analysis, it reveals that students perceive lecturer adaptation to online learning as quite good, the quality of the network as tolerable, although there are areas where the internet signal is considered weak. The students’ experience of online lectures is a little less satisfactory. The highest scores of students' expectations for future teaching system are: 48% for a 50% online and 50% offline system, 75% for a pure offline system, and 25.6% for a 25% online system. The relationship between students' perceptions of the adaptability of lecturers, internet quality and their experiences of online lectures affect the student’s comfort in online lectures in the form of a linear regression.

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