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 research is a quantitative research. That have the objective to study 1)demographic characteristic affecting on purchasing decision through JD Centralapplication 2) online marketing communication affecting on purchasing decision through JD Central application. The sample is customers who purchase products through the JD Central application of 400 persons. The researcher selected purposive sampling by using questionnaires with the reliability of each variable between .906 - .949. Statistics used to analyze data were frequency percentage mean standard deviation one - way analysis of variance and multiple regression analysis with a statistical significance level of .05. The results showed that 1) most of the respondents were male 54.00 percent age between 18 - 31 71.00 percent bachelor’s degree 66.50 percent status of single people 71.75 percent sudents 36.25 percent Income/month less than 15000 baht 36.50 percent and family size 3 - 4 people 54.50 percent 2) demographic characteristics affecting on purchasing decision through JD Central application with a statistical significance of .05 were education levels 3) online marketing communication affecting on purchasing decision through JD Central application with a statistical significance of .05 were Website Twitter and Facebook.

The objectives of this research were 1) to investigate food ordering behavior through online applications 2) to study Food-Based Dietary Guidelines affecting food ordering through online applications 3) to study decision-making process affecting the process of choosing to order food through online applications 4) to compare decisionmaking process for food ordering through online applications classified by personal factors and 5) to study the relationship between Food-Based Dietary Guidelines and food ordering decision-making process through online applications of high school students in the Secondary Educational Service Area Office 1 under new normal. This study was a quantitative research. The sample was 400 high school students at extralarge secondary school under the Secondary Educational Service Area Office 1 Bangkok. The sample had at least once to order food through online applications. A questionnaire was used as a research instrument for data collection. Data were then analyzed using statistics including frequency percentage mean standard deviation t-Test and F-Test and Pearsons correlation coefficient. The results of this research indicated that most of the respondents werefemale aged 16 currently studying at Mathayomsuksa 4 level and under the schoolgroup 1. In terms of food ordering behavior through online applications under the newnormal it was found that the students used to order food through the online GrabFood application the most. The most ordered food was savory food and paid attention to the cleanliness of food and the safety of the selected food as well as the freshness of the food. The food was mostly ordered on Sundays. The average cost was about 101-200 baht per time. The respondents made their own decisions to buy food and the reason for deciding to order food was to have the food delivered quickly. For the importance of Food-Based Dietary Guidelines affecting food orderingthrough online application under a new normal. Overall importance level of Food-Based Dietary Guidelines affecting food ordering decision through online applicationsunder new normal was at the moderate level. When considering each aspect sevenitems were at a high level one item was at low level and the other one is at thelowest level. The level of importance of the decision-making process affecting theselection of online food ordering applications under the new lifestyle base was foundthat the overall importance was at a high level. For each aspect it was found at thehighest level in 2 aspects and at a high level in 3 aspects. The results of the comparisonof the decision-making process for food ordering through online applications under the new normal classified by personal factors it was found that the respondents with different gender and affiliated school had different decision for food ordering through online applications with a statistical significance level of 0.05. The results of analysis of the relationship between Food-Based Dietary Guidelines and food ordering decisionmaking process through online applications of high school students in the Secondary Education Area Office 1 under the new normal indicated that two variables had negative relationship at a low level. When considering each aspect it was found that the four variables had a low relationship and in the same direction as follows: eating food that was clean and free from contamination followed by eating a lot of vegetables eat fruit regularly eat fish lean meats eggs and legumes. Eating foods that were moderately fat. The results also found that five variables of the Food-Based Dietary Guidelines were associated with low levels of correlation in the opposite direction as follows: avoid eating foods that are very sweet and salty consumption of a wide variety of nutritious foods from the five food groups always take care of your body weight drinking milk according to age abstain or reduce alcoholic beverages eat rice as a staple food alternating with some starchy foods respectively.