<p>Open loop shaped control system is a form of system control without any feedback from the system. One example is the on-off condition which functions to connect and disconnect electricity. The condition to be studied is a dc motor that can be set to live and die via internet server-based client service. The server in this system is a virtual private server (VPS) device that will provide a source of service to the client in the form of a collection of information on dc motor conditions. In addition, its function is also to record the working time of the dc motor. So that a schedule can be determined when the dc motor is maintained. While the client is a control unit consisting of a microcontroller device, an ethernet module enc28j60 and a dc motor. In general the working principle of the system is beginning with the user accessing the desired VPS IP address through a web browser application. From the web browser the user chooses a dc motor to be activated. But before the client has been connected to the VPS regularly (every second), the point is to always get the latest dc motor condition information. Then the microcontroller will set the dc motor in active or off condition. The research method used is research and development. The results obtained from this study are that the amount of bandwidth needed for communication between VPS and microcontrollers via the internet network, when the control unit works is 6.02 kbps, while the response time for dc motor is 3.16 seconds and the response time for dc motor 2 is 3.46 seconds.</p>
This research mainly talks about the use of quick response (QR) code reader in automating of recording the users' face. The applied QR code reader system is a dynamic type, which can be modified as required, such as adding a database, functioning to store or retrieve information in the QR code image. Since the QR code image is randomly based on its information, a QR code generator is required to display the image and store the information. While the face recorder uses a dataset available in the OpenCV library. Thus, only the registered QR code image can be used to record the user's face. To be able to work, the QR code reader should be 10 to 55 cm from the QR code image.
This study aims to find out the significant differences between students' mathematical understanding abilities that are taught using the Cooperative Learning Model type Auditory Intellectualy Receptition (AIR), Numbered Heads Together (NHT), and conventional learning models, and which learning model gives better results to improve students' mathematical understanding abilities. This type of research is quasi-experimental. The population in this study was class VIII 27 of Seluma State Junior High School consisting of 4 classes. The sample of this study was chosen 3 classes randomly, namely class VIII A as the experimental class I using the Cooperative learning model type Auditory Intellectualy Receptition (AIR), class VIII B as the experimental class II using the cooperative learning model type Numbered Heads Together (NHT), and Class VIII C as a control class using conventional learning models. Data collection on student mathematics learning outcomes in the form of tests consisting of pre-test and post-test. Data were analyzed using ANAVA and BNT. Based on ANAVA results, there are differences between students' mathematics learning outcomes in experimental class I, experimental class II, and control class. Based on the LSD test it was found that the treatment between the experimental class I with the experimental class II, the experimental class I with the control class, and the experimental class II with the control class there were differences. Auditory IntellectualyReceptition (AIR) cooperative learning model provides better results than the Numbered Heads Together (NHT) type of cooperative learning model and Conventional learning model.Keywords: mathematical understanding ability, AIR, NHT, learning model
This research aims to determine the performance difference of using a standard electronic control unit (ECU) compared to re-programming the ECU of a motorcycle. The experiment was carried out on a Honda CRF 150cc motorcycle manufactured in 2018. The research methods are experimental research and use descriptive statistic method. Research findings inform that the maximum torque of the standard ECU is 13.7 Nm at 4700 rpm, and the maximum power is 9.2 KW at 7000 rpm. The re-programming ECU has a maximum torque of 17.1 Nm at 5700 rpm, and a maximum power of 12.1 kW at 7200 rpm. The apparent increase in torque is around 80.11 % and in power is around 76 %. It can be concluded that the re-programming ECU provides a more optimized engine performance on a CRF150L motorcycle.
In this study, the author wants to further identify, especially the influence of variations in the number of blades on cylindrical basin-type vortex turbines on their performance. The method used is simulation using CFDs and experimental. Variations in the number of blades used are 5 and 7 blades. The results of this study show that the increase in the number of blades will affect the amount of torque and power produced. In the simulation results, the highest torque in a 5-blade turbine was 13.44 N.m while in a 7-blade turbine, a maximum torque of 14.6 N.m. The results of this simulation were validated by experimental data with a percentage of acceptable errors. The experimental results showed that the highest efficiency occurred in turbine 7 blades of 43.5% and the minimum efficiency occurred in turbines of 5 blades of 40.4%. This study analytically shows that the increase in the number of blades will increase the number of areas in contact with water which will increase the absorption of water energy by turbines.
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