จำนวน Repository ( 24 )

การสร้างและหาประสิทธิภาพชุดทดลองเพื่อพัฒนาทักษะการเรียนรู้วิชากลศาสตร์ของไหล
การสร้างและหาประสิทธิภาพชุดทดลองเพื่อพัฒนาทักษะการเรียนรู้วิชากลศาสตร์ของไหล

The Experiment Set of Pipe’s Loss Flow is intended to design and create a trial version of the loss of flow in the pipe and the objective is to find the speed of the flow through the pipe by reading the difference of pressure The Experiment Set of Pipe’s Loss Flow is equipped with the structure of a width of 86 centimeters long 120 cm high 171 centimeters and have a trial version which contains the water pump the Centrifugal pump size 0.5 HP 220 – 240 volt 1 set. The tanks for trial 28 liters

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การหาส่วนผสมแบบหล่อทราย โดยใช้หลักการออกแบบการทดลอง กรณีศึกษา : อุตสาหกรรมข้อต่อเหล็ก
การหาส่วนผสมแบบหล่อทราย โดยใช้หลักการออกแบบการทดลอง กรณีศึกษา : อุตสาหกรรมข้อต่อเหล็ก

This research aimed to determine the optimal sand mold mixture’s ratio by using return sand bentonite water content and new sand component. Then the properties of the mixture according to the standards of American Foundrymen’s Society include the ability of compactability moisture content permeability and green compressive strength. This study applied mixture experiments and response surface methodology to determine an optimal sand mold mixture components condition. After the experiment and linear programming it indicated that the condition was at return sand (95.5387 %) bentonite (1.130102 %) water content (2.331196 %) and new sand (1 %). The green sand mold has compactability (58.37923 %) permeability (73.80148 %) moisture 6.5 % and green compressive strength (0.53 Kg/cm2). At this condition the cost is 11.31579 baths per kilogram.

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Banana board : a basic experimental microcontroller board
Banana board : a basic experimental microcontroller board

This paper aims to present a basic experimental microcontroller board for use in teaching the microcontroller and programming. Researchers have designed a microcontroller experiment board is cheap easy to carry easy to use. To enable the students to learn programming quickly without having to worry about the hardware. Banana Board supports the basic knowledge necessary to practice the programming of up to 22 topics. It can learn programming from basic to applied work. The connection can be done through a personal computer or connect the board to communicate

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Optimization for sewing machine setup using experimental design technique
Optimization for sewing machine setup using experimental design technique

The objective of the research was to identify the optimized thread tensile values for the setup of Model D – We 1218-55 computerized 18-needles sewing machine in order to minimize a number of times the machine halts. The cause of the sewing machine halting which reduced the efficiencies of the machine was found to be torn threads. In order to maximize the efficiencies the experimental design technique was utilized to find the optimal values for five types of cloth: polo tc-cool cotton jacket and shirt. The method involved three nested designs which are the type of thread number of sewing layers and thread-hole size. The three thread tensile levels experimented were low (2 oz.) medium (5 oz.) and high (8 oz.) and the response was the number of times the machine halted in the span of 30 minutes. The ANOVA (Analysis of Variance) used for the experimental design showed that the three factors significantly affected the machine’s halt. The number of times the machine halted was used to create Surface Plot with polynomial trend-lines and the quadratic equation was applied to determine the optimal value for each type of thread number of sewing layers and thread-hole size. The values obtained were then set for another experiment the results of which were that the sewing machine halted less frequently and the efficiencies thus increased about by 77.01%.

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Experimental study on performance of solar collector in biodiesel production process with solar thermal system
Experimental study on performance of solar collector in biodiesel production process with solar thermal system

This experimental research was to test a performance of flat-plate solar collectors using biodiesel as a working solution with a solar thermal system. The purposes were to promote a biodiesel use as an alternative fuel for higher efficient heat energy and as an added renewable energy for a production process and to provide a guideline in education and for development in the future. The experiment was to test a performance of flat sheet solar collectors using ASHRAE STANDARD 93-2003 and to test a thermal potential of 12 litres by volume of biodiesel in a 2 m2 flat- plate solar collector used as heat source of the system. Thus biodiesel was used as a working solution with a flow rate of 2.4 litre per minute and the test duration was between 09:00 am. and 03:00 pm. The result revealed the performance values of the flat-plate solar collector used in this experiment as FR( ) = 0.958 and FRUL = 15.02 W/m2K. The temperature of biodiesel in the solar thermal system increased from 33๐C to approximately 80-90๐C varied with solar radiation values. However; the mentioned degrees could be efficiently applied in biodiesel production process as a main heat source or a supplemental heat source depending on appropriate variables.

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