จำนวน Repository ( 816 )

การประเมินผลลัพธ์ของกิจกรรมรับน้องสร้างสรรค์จากการวิเคราะห์ต้นทุน-ผลได้
การประเมินผลลัพธ์ของกิจกรรมรับน้องสร้างสรรค์จากการวิเคราะห์ต้นทุน-ผลได้

Ministry of Higher Education Science Research and Innovation has declared the policy towards university intiation with creative warm impressive and students’ improvement reinforcement. It is put into effect to every institute strictly. The research is a mixed-methods paradigm in order to evaluate the results of creative initiation by studying the perspectives on activities as well as the effects of creative initiation. Moreover setting the objectives and creative initiation indicators employing cost-benefit analysis are concerned. With simple random 362 undergraduate students of Faculty of Business Administration of Rajamangala University of Technology Phra Nakorn are the participants of this study. The study not only employs descriptive statistics —frequency percentage average and standard deviation— but also takes the focus group interview to collect data. To do so using purposive sampling to get 13-activity-staff as well as 12-activity-participant helps the researchers to analyze data in many dimensions: important issues and brainstorming for creating the next-time activities. The results found that 1. university students’ perceptions on activity was above average (good); such a type of activity was needed and related to the project’s objective 2. university students shared their opinions towards activity’s effects as followed: 1) positive effect is good; the activity caused unity responsibility and people and environment adaptation 2) negative effect is moderate; university students complied to do the activities but the activity’s processes should be improved. This was because various activities affected mental issues. According to previous activities’ cost-benefit analysis of Faculty of Business Administration they found that the cost of “Rak-Rua-Wang” project was the highest because there was high fixed-cost. On the other hand the project “Jit- Ar-Sa-Pha-Nong-Tham-Dee” had the least cost. To conclude internal rate of return modified internal rate of return and net present value of every project tended to increase continuously since university students in different majors involved in the activity increasingly.

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รถไฟฟ้าแบบปรับนอนควบคุมด้วยอาดุยโน
รถไฟฟ้าแบบปรับนอนควบคุมด้วยอาดุยโน

The purpose of this project is to construct a horizontal electric train controlled by the Arduino. For the cost that is cheaper than the market and users can be self - reliant in daily life In which the car size is equal to the electric train that is sold in the general market. The organizers can write an arduino program to control the movement of the car from the joystick lever. The built weighing 25 kilograms is powered by a 12 volt battery that provides power to the circuit to control the direction of the car. The car can support a maximum weight of 100 kilograms and can be adjusted to more than 160 degrees. Experimental results Found that the operation of the electric train is adjustable controlled by Arduino Able to work according to objectives. This Arduino - style electric train can adjust the sitting position to your desired position. The control to change direction can be forced forward backward left right turn from the lever from the joystick as needed. As for the road characteristics it can be used as smooth and sloping roads.

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การวิเคราะห์การผสมพลาสติกชีวภาพพอลิแลคติกแอซิดและเทอร์โมพลาสติกสตาร์ช
การวิเคราะห์การผสมพลาสติกชีวภาพพอลิแลคติกแอซิดและเทอร์โมพลาสติกสตาร์ช

This research was concentrated on characterized mechanical properties and adjusted compatibility of poly (lactic acid) (PLA) with thermoplastic starch (TPS) as biodegradable polymers composites. PLA was blended with TPS at the proportion of 10 20 30 50 and 70 wt% as well as 2 phr chain extender by an internal mixer at 200°C. The blended materials were then injection molded at 230°C. Tensile testing showed that as the amount of TPS increase the elongation at break tended to increase but the tensile strength and modulus tended to decrease. The morphology was investigated by scanning electron microscope. It was found that distinct phase between PLA and TPS was observed. Yet adding the chain extender clearly improved the compatibility between PLA and TPS. The blended materials were also analyzed by differential scanning calorimetry method to study thermal properties. It was found that as the amount of TPS increased the glass transition temperature (Tg) melting temperature (Tm) and cold crystallization temperature (Tcc) deceased. Additionally chain extenders did not affect thermal properties. The thermal stability of the composites decreased when increasing the amount of TPS because of the degradation of TPS in PLA. However when heated at 100ºC for 1 hr the PLA sample bent while TPS did not bend. When PLA was mixed with TPS the composite was bent according to adding TPS.

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การศึกษาพฤติกรรมการเผาไหม้ของเตาแก๊สแรงดันต่ำแบบเวอร์ติคอลพอร์ตด้วยวิธีพลศาสตร์ของไหลเชิงคำนวณ
การศึกษาพฤติกรรมการเผาไหม้ของเตาแก๊สแรงดันต่ำแบบเวอร์ติคอลพอร์ตด้วยวิธีพลศาสตร์ของไหลเชิงคำนวณ

The objective of this research is to study the combustion characteristic of a low-pressure vertical port burner using computational fluid dynamics (CFD). The simulation model was created using Fluent 6.3 in 3D-model of the same size of the burner. The CFD results were verified by measuring the temperature around the burner head and a vessel. Moreover the results of conventional vertical port burner having the swirl angle of 90o and the inclination angle of 90o (CB-S90I90) and two swirl port burners (SB) being SB-S90I13 and SB-S30I90 were compared. The temperatures obtained from CFD and experiments were similar which the error was less than 9%. From the CFD’s results the temperature and heat flux of the SB-S90I13 burner were higher than those of the CB-S90I90 burner. The maximum temperature and heat flux of SB-S90I13 burner were 1445 K and 5291 W/m2 respectively. It was implied that the combustion characteristic and heat transfer to the vessel of SB-S90I13 burner was better than that of CB-S90I90 burner. It was resulted that the thermal efficiency of SB-S90I13 burner was better than that of CB-S90I90 burner which was the percentage energy saving of 6.93%.

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การใช้หลักปรัชญาเศรษฐกิจพอเพียงในการดำเนินชีวิตของผู้มีงานทำในกรุงเทพมหานคร
การใช้หลักปรัชญาเศรษฐกิจพอเพียงในการดำเนินชีวิตของผู้มีงานทำในกรุงเทพมหานคร

The purpose of this study is to study the 1) Demographic factors affecting the knowledge about the sufficiency economy philosophy of those employed persons in Bangkok. 2) Demographic factors affecting the use of sufficiency economy philosophy in the life of the person employed in Bangkok. 3) The relationship between knowledge about sufficiency economy philosophy and the use of sufficiency economy philosophy in the life of the employed persons in Bangkok. The samples in this research were 540 the employed persons in Bangkok selected by multistage random sampling. The research instrument was test with 10 items and questionnaires of rating scales with 30 items. The statistics used to analyze the data including the number and percentage mean standard deviation t - test for independent sample One-Way ANOVA Scheffe’s test analysis and simple correlation coefficients were statistical method to analyze data. The research found that: 1) Most of the respondents were female aged less than 35 years single status education level Bachelors degree career employees to a private company. The average monthly income of less than 35000 baht Hometown Central region. Have knowledge of the sufficiency economy philosophy at a moderate level. The sufficiency economy philosophy is applied to life at a high level. 2) Demographic factors affecting knowledge of the sufficiency economy philosophy include gender age education level occupation and average monthly income. Comparison results vary statistically significantly at a significant level of 0.05. 3) Demographic factors affecting the use of sufficiency economy philosophy in the life of those employed in Bangkok include gender age marital status education level occupation and average monthly income. Comparison results vary statistically significantly at a significant level of 0.05 4) The relationship between knowledge about sufficiency economy philosophy and the use of sufficiency economy philosophy in the life of the employed persons in Bangkok. There was a relationship that was not statistically significant. At a significance level 0.05

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