A closed wet cooling tower became popular for heat transfer process but the existing system was not sufficient for the heat transfer of the manufacturing line. This research aimed at investigating the heat transfer enhancement of the 200-ton closed cooling tower by installing spray nozzles to spray water to the condenser. The distance between the spray nozzles and the condenser were 20 30 40 50 and 60 centimeters. The mass flow rates of water spray were 8 10 12 and 14 liters per minute. The objectives of the study therefore were to study the heat transfer coefficient of cooling water and to evaluate the economic value of this improvement option’s investment costs. In this study the outlet temperature of the cooling tower was set to be less than 37°C the difference of inlet and outlet water temperature was 2.9°C and the overall heat transfer rate approximated 360 kW. The results of the study reported that the distance of the spray nozzles and the condenser was at 30 centimeters and the mass flow rate of water spray was 12 liters per minute. The rate of heat transfer was 362 kW. The efficiency of the cooling system was 0.8 which became suitable for real use. In addition to considering value investing the results showed that the payback period was 0.47 years and the net present value was 1693801 baht. The rate of return received from the project was 207% which was worth investing.

The purposes of this study were to compare demographics to making purchasing decisions to Japanese skincare products of female consumers in Bangkok and study the marketing communications affected the buying decision Japanese skincare products of female consumers in Bangkok. This research was the quantitative research by using questionnaires from 384 female consumers who previously purchased the product by uses the multi-stage sampling method. The data was analyzed by as frequency percentage mean standard deviation t-test statistic One-Way ANOVA and enter multiple linear regression at the statistical significance level of .05. The results showed that: most of the sample was between 25 - 34 years (35.40%) single status (68.20%) average monthly income of 10001 - 20000 baht (34.10%) education of bachelors degree (55.70%) and work in private companies (48.70%). The average monthly income education level and occupation had different decisions purchasing Japanese skincare products among female consumers with statistical significance at the .05 level. Marketing communication influence female consumers purchasing decision of Japanese skincare products with statistical significance at the .05 level were sales by individuals (29.10%) public relations (18.10%) and promotion (15.80%).

The purposes of this research were to study 1) the personal factors of small entrepreneurs who decide to buy instant banana fritters batter mix in Chiang Mai province 2) the production factors of small entrepreneurs who decide to buy instant banana fritters batter mix in Chiang Mai province 3) the purchasing decision on instant banana fritters batter mix of small entrepreneurs in Chiang Mai province 4) the relationship between personal factors and the small entrepreneurs’ purchasing decisions on banana fritters batter mix and 5) the relationship between production factors and the small entrepreneurs’ purchasing decisions on banana fritters batter mix in Chiang Mai province. The population of the study included 328 small entrepreneurs 265 participants were selected by a specific selection method. The instruments used in this study were questionnaires. The statistics used for data analysis were frequency percentage and chi-square. The results of the study were as follow: 1) personal factors of the small entrepreneurs most of them living in Mueng district Chiang Mai mostly female aged between 31 to 40 years. Their educational background was below the bachelors degree. The average monthly sales revenue ranged from 5001 to 10000 baht sales volume of fried bananas was 10– 20 bunches per day the location of the shop was in front of the house. 2) Factors of production it was found that small entrepreneurs placed high importance on personnel budget raw materials and management. 3) The small entrepreneurs purchasing decisions on banana fritters batter mix found that small entrepreneurs decided to buy “Kueakun brand”. The reason for the purchase was delicious taste. The outstanding feature of instant banana fritters batter mix was that the fried bananas were crispy for a long time. The place of purchase was the market/retail store. The amount purchased was 10 – 20 kg/time. The purchase cost was 1000 – 2000 baht/time. The purchase frequency was 1 - 2 weeks/time. The ingredient that needed to be added was dried shredded coconut and the desired scent was no need to add flavorings. 4) The relationship between personal factors and the small entrepreneurs purchasing decisions on banana fritters batter mix the results showed that personal factors in terms of gender age education level average sales income per month and sales volume per day there was a statistically significant correlation with the outstanding feature of instant banana fritters batter mix at .05 level. 5) The relationship between the production factors and the purchasing decision on the instant banana fritters batter mix of the small entrepreneurs found that the production factors in terms of personnel raw materials and the management aspect had a statistically significant correlation at the .05 level.

This thesis presents an application of particle swarm optimization technique (PSO) to optimal economic dispatch analysis in power system with contingency criteria for management power system operation cost power loss and bus voltage. The objective of optimal economic dispatch for contingency in power system compared with the results of analysis power system in normal case. The study result show that when contingency occur in power system operation cost are rising. In the other hand system stability are decrease.

The purposes of this special project were to produce the public relationship Ecotourism at Suphanburi Province and to evaluate the satisfaction by 200 people when they participated with travel manual by online questionnaire. The satisfaction to analyze by using frequency deviation average and percentage. The result occurred that the satisfaction of the reader was in high level. (𝑥̅ = 4.20 S.D.= 0.48) Keywords: Public Relations Guidebook Hoop Khao Wong Reservoir