Journal of Engineering and Scientific Research (JESR)
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The Effect of Pin Shape on the Friction Stir Welding Quality of Aluminum AA1100 Series
Full text linkAluminum is a material that is soft, lightweight, resistant to corrosion, and has good electrical and thermal conductivity. Aluminum has a specific gravity of about 2.65-2.8 kg/dm³, a melting point of 658ºC, and tensile strength of 90 MPa. Aluminum 1100 series is an aluminum alloy mixed with other materials, such as copper, iron, chrome, manganese, and zinc, with an aluminum content of 99,0%. Welding is the joining of two metals in a liquid state with or without filler. FSW (friction stir welding) is friction welding; the process does not require filler material. The heat used to melt the metal is obtained from the friction between the indenter and the workpiece. In the research, the shape of the indenter pin used is, ovale shape, cone shape, and changing spiral form with a tool rotation of 2000 rpm and a welding rate of 16 mm/minute. The tests carried out are Rockwell hardness testing and tensile tests. From the results of research conducted, it was found that the shape of the indenter pin greatly affects the quality of the weld. The indenter pin changing spiral form results in better weld quality compared to the other two pin shapes
Numerical Simulation of The Magnetic Levitation System in State-Space Form
Full text linkThe maglev system is a technology that uses the repulsive force between magnets to float or levitate an object or vehicle. Maglev trains use electromagnets to counter the gravitational force of an object, so that the object can float in the air. With this technology, the resulting loss between the workpiece and the base can be eliminated. The technology used in this train is Electromagnetic Suspension (EMS). The research began by modeling the maglev system in the form of state space. Furthermore, the stability system model that has been built is analyzed. Finally, it is analyzed how the numerical simulation of an open loop without control is analyzed. The result of this research is that the floating system (maglev) is an unstable system if it is run in an open loop, so the maglev system requires sensors and controls in its operation
Performance analysis of Newton-Raphson Power flow computations based on Power and Current Mismatches
Full text linkThis work studies the performance of single-phase power flow computations implemented using vector-based Python scripting language. Two approaches are considered, namely the current mismatch and power mismatch based on Newton-Raphson method. Both approaches are developed using rectangular coordinates and tested through a variety of IEEE test systems modelling high voltage transmission networks. The computational burden and accuracy of both implementations are duly discussed. This work will be later incorporated into our vector-based Non-linear Primal-Dual Interior Point Method as constraints
The Effect of the use of Silica Sand Before and After Physical Activation on Acceleration of 4-Step Gasoline Motorcycle Engine
Full text linkThis research was conducted with the aim of knowing the Effect of using silica sand before and after physical activation on the acceleration of a 4-stroke gasoline motorcycle engine. This research was conducted by testing the acceleration 0 – 80 km/hour and 40 – 80 km/hour with variations in the composition of tapioca in the pellet mixture (1%, 2%, and 3%) and variations in temperature activation (150?C, 200?). C, and 250?C). The silica sand pellets used in this study were 10 mm in diameter with a thickness of 3 mm, which had been activated for 60 minutes. The results showed that the use of silica sand had an effect on the acceleration of a 4-stroke gasoline motorcycle. The best composition of silica sand pellets occurs in the amount of tapioca 3% and with an activation temperature of 250?C, which can increase the acceleration by 12.45% at an acceleration of 0 – 80 km/hour
Usability of Lampung Heritage Virtual Reality Tour
Full text linkLampung Heritage Virtual Reality Tour was developed as a tool to educate the importance of Lampung’s historical heritage. It represents eight Lampung historical heritage sites in the virtual reality world, namely the Lampung Museum, Thay Hin Bio Vihara, Al-Anwar Mosque, Lampung Siger Tower, Krakatau Monument, Kerti Bhuana Temple, Nuwo Sesat Traditional House, and the Japanese Caves. Functional features of the Lampung Heritage Virtual Reality Tour are visiting virtual tourist spots and viewing information on virtual tourist attractions. Digital tourists can select a virtual tourist spot with the location panel. The user perception and satisfaction require a qualitative measurement to understand its impact on educating Lampung's historical heritage. Using usability, we should understand the quality of the Lampung Heritage Virtual Reality Tour. The tools to measure the usability level of the application are the User Acceptance Test and the System Usability Scale. There were 15 questions User Acceptance Test (UAT) with a composition of five questions affordance, four questions signifier, and six questions feedback. According to the SUS standard, we asked ten questions on the System Usability Scale (SUS). The result for UAT was an average of 95.75%, which consist of 95.00% affordance, 94.79% signifier, and 97.45% feedback. The result of SUS was Good, based on a score of 83.39. The Lampung Heritage Virtual Reality Tour meets good usability standards, making the application suitable
Design and Development of Management Information Systems at the University of Lampung Library Repository Using the Laravel Framework.
Full text linkThe University of Lampung has a library that is used to support the university's academic activities. One of the services at the Unila library is a digital library service that is used to upload scientific works into the repository, but there are still manual processes that are carried out repeatedly such as collecting requirements files, giving accounts and coordinating with students who require to come to the library continuously. so that the process carried out is not efficient. This study aims to build a management information system on the repository using the Laravel framework which can be used as a solution for the Unila library to make it easier for users to upload scientific works into the digital library repository. The development of this application uses the kanban method, which includes the process of analyzing system requirements, designing, developing to testing. The results of this study succeeded in providing a file upload service for account application requirements and uploading a repository link that was validated by the admin. The service is then tested using the blackbox method which produces the expected output so that it can be concluded that the application passes the test
Web-Based Interactive Virtual Tour as an Information Media and Introduction to Post-Pandemic Lecture Buildings at Universitas Lampung
Full text linkThis study aims to determine the effectiveness of architectural communication methods using a link embedded in online media or social media. This research method is an interactive communication simulation in the form of a Virtual Tour using the 360o panoramic image method. A 360o panoramic image is multiple images combined to get a wider, more detailed image. Panorama images will be set using software and then uploaded to a website's database. The public, in this case more concerned with the academic community, can easily get information about the shape of buildings and spaces from various predetermined points, without installing certain 3D Architecture software. It is enough to use a computer or smartphone based on iOS or Android and without using object tracking or the like to activate communication, because it is web-based, it can be easily accessed anywhere and anytime as long as the user has the intended link. This is an alternative media in providing information about the object, which in this case is the Lecture Building to the public, especially students and parents during the post-pandemic period
Analysis Characteristics of Passenger in Election of Executive Ship Transportation Mode (Cases Study: Bakau Heni-Merak Port)
No full textFerry is one of the strategic water transportations, but Ferry is often not considered important in its development, so research are needed to examine the effect of passenger characteristics on executive ferry transportation. Mode selection is one of the models used in transportation planning, this is due to the key role of public transportation in an effort to improve services from transportation modes. This study was conducted to determine the characteristics and factors that influence passengers in choosing modes. The analysis of the mode selection model in this study uses logistic regression analysis with the help of the SPSS program. The results in the study explain that the factors that influence the choice of mode for executive ferry passengers are Income Level Variables (X5), Transportation to Port Variables (X7) and Ship Schedule Considerations Variables (X10). Results Based on statistical tests, the following logistic regression was obtained: Y = 0.049 + 1.593 X5 + 1.017 X7 + 0.0834 X1
The Effect of Barite Addition and Graphite Particle Size on The Specific Abrasion of Fly-Ash/Phenolic Composite for Brake Lining Application
Full text linkAnnually, million tons of fly-ash and bottom fly-ash is a waste of coal power plant. Fly ash contains Iron-oxide, alumina and silica. Those hard particle makes fly-ash can be used as a reinforcement in polymer composite. This composite is a wear resistance material and can be used as material for brake lining application. Fly ash reinforced phenolic composite has a low specific abrasion. The composite for brake lining material consisted of the reinforcement, friction modifier, solid lubricant and filler. Graphite is used as solid lubricant while barite is used as filler. Many research were carried out research on the particle size effect on the composite mechanical properties. However the size different between the constituent in composite has not investigated. Also the optimal barite weight fraction has not being observed. The composite was made by mixing all of the constituent, pressing in the mold and curing. The result show that the graphite particle size ? 150 mm has the lowest specific abrasion. The observation using scanning electron microscope shows that the composite contained small particle of ? 56 mm tends to agglomerate than the composite contained larger particle of ? 150 mm. the composite contained 15% barite has the lowest specific abrasion. The micrograph of scanning electron microscope shows the mixed of phenolic and barite evenly covered the graphite and fly-ash particles
Rapidness Characteristics of Ultrasonic Wave Propagation on Eggs Using HC-SR04 Module
Full text linkFertility rate is one of the main factors of the success of an egg in order to hatch properly. The process of egg fertility detection is currently visually based, using manual methods (by carrying eggs one by one). This takes time and cost so that it will affect the production of poultry cultivation. This study aims to find out the characteristics of rapid propagation of ultrasonic waves in eggs. Information regarding the characteristics of rapid wave propagation is very important in the process of evaluating and testing the quality of eggs because the rapid propagation of the wave reflects the quality of the eggs that are generally done destructively. This research is expected to be preliminary information in developing rapid and objective non-destructive technology for determining the fertility of poultry eggs using ultrasonic waves. The study reported the results of rapid measurements of ultrasonic wave propagation propagated on different types of eggs. This study used three types of eggs, namely poultry-chicken eggs, organic-chickens and ducks. Methods in the process of determining the characteristics of each egg using ultrasonic waves. Ultrasonic waves are waves that can propagate on certain objects, materials and components. The HC-SR04 module is used as an ultrasonic wave transmitter and receiver medium. Ultrasonic waves of 40 Khz are propagated to the surface of the egg and received by a receiver transducer placed facing each other. The distance between the egg and the HC-SR04 module is 5 cm and 10 cm. Distance and length of propagation time parameters are used as information to generate egg wave propagation speed values. The test process was carried out on 10 eggs, from each type. The observed age of the egg sample was 5 and 14 days. Based on the results of testing and calculations provide results that duck eggs have the highest speed value, while chicken eggs are the lowest.
Keywords: Egg, Ultrasonic Waves, HC-SR04, Propagation Speed