The objectives of this study were 1) to study factors of curriculum staff school image career path and environment of Chitralada School (Vocational Programme) and 2) to compare those factors affecting to study in a vocational certificate level of students at Chitralada School (Vocational Programme). The participants consisted of 324 vocational certificate level students from year 1 to year 3 in Academic Year 2018. The research instrument was a questionnaire. To analyze the questionnaire data the researcher employed percentages mean and standard deviation. The hypothesis was compared by F-test. The Fisher’s Least-Significant Difference (LSD) was utilized to determine the significant differences at .05 level. The findings in this study revealed that most students were male whose ages were 17 years old. Their Grade Point Average (GPA) was 2.51-3.00. Their guardians were government officials and their incomes were 20001-30000 baht. The results were 1) To study five factors of the students at Chitralada School (Vocational Programme) it was found that the students had opinions towards each factor at high level on career path curriculum school image school environment and staff respectively.2) To compare those five factors affecting to study it was found that the students with different majors and guardians from different careers had different opinions in terms of curriculum school image and career path. In addition the students who had guardians with different incomes had different opinions in terms of staff.

The performance investigations of subcritical ORC supercritical ORC and trilateral Rankine cycle (TLC) power plants with the heat source temperatures of 210-250°C were conducted and compared in this study. Several working fluids were evaluated. A MATLAB code was developed and used in this study. The thermodynamic properties of the working fluids were calculated by using NIST REFPROP program. The justification of the code was validated with a result taken from the literature. The optimal operating conditions were searched using the golden-section technique. The maximum net output power of 141.72 kW was obtained when using the supercritical ORC plant with R141b as its working fluid and the heat source temperature was at 250°C. The corresponding cycle efficiency was 16.25%. When using the subcritical plant at the same heat source temperature the maximum net output power of 133.40 kW and cycle efficiency of 15.70% are obtained when pentane is used as the working fluid. Furthermore the net output power of 133.82 kW and cycle efficiency of 14.90% are obtained when using R141b as the working fluid in the TLC power plant. According to the off-design simulations an appropriate adjustment of the working fluid flow rate can mitigate the variation of the net output power.

The study on the trend of demand and factors affecting selection of Business Administration graduates from Rajamangala University of Technology Phra Nakhon to work for commercial banks in Bangkok and metropolitan area was aimed at studying 1) the trend of demand for Business Administration graduates to work for commercial banks 2) factors affecting selection of Business Administration graduates from Rajamangala University of Technology Phra Nakhon to work for commercial banks and 3) analysis of satisfactory characters affecting selection of Business Administration graduates from Rajamangala University of Technology Phra Nakhon to work for commercial banks in Bangkok and metropolitan area. The questionnaires were constructed and passed internal consistence test of alpha method with more than 0.70. They were used as a tool for collecting data from 400 branch managers of Thai and foreign commercial banks. The statistics used for analysis were SPSS with frequencies distribution percentage mean standard deviation and exploratory factor analysis. The research finding indicated that 1) in 2005 the commercial banks in the sample group are planning to acquire new staff who graduated Administration Business from both Bachelors degree and Masters degree with Thai or English program. They mostly required the ones graduated from Finance and Banking and also Accounting Marketing General Management respectively. The Business Administration graduates from Rajamangala University of Technology Phra Nakhon were required the most and the second was from public universities and the third was from private universities. 2) the first-ranked factor affecting selection of Business Administration Bachelors graduates from Rajamangala University of Technology Phra Nakhon to work for commercial banks in the sample group was morality and honesty and for Masters ones was leadership 3) Working ability affecting selection of Business Administration both Bachelor and Masters graduates from Rajamangala University of Technology Phra Nakhon to work for commercial banks in Bangkok and metropolitan area at highest level with a variance of 14.074% and 13.501% respectively.