The purpose of this research was to study hot-melt adhesives from natural rubber (Standard Thai Rubber 20 STR 20). In order to improve the adhesion and melting properties of hot-melt adhesive to get the best glue formula from STR 20 the ethylene vinyl acetate content (EVA) paraffin wax (Wax) and petroleum resin (Resin) were varied from 25 50 100 125 and 150 phr (Part Per Hundred Rubber). It was found that the best adhesive formulas consisted of 100 phr of STR 20 25 phr of wax 150 phr of EVA and 150 phr of resin. For preparing hot-melt adhesive first the wax was heated and maintained at 160-170 ºC then cut the STR 20 into small pieces and slowly added the rubber into the melted wax until the rubber was completely melted. And then added resin and EVA and cooled to room temperature finally the results show that hot-melt adhesive was dark brown hard and odorless smooth texture and easy to melt with 514±14 centipoises of Viscosity at 150 ºC 82.49±1.4 lbf/in2 of shear strength and 2.06±0.02 kN/m of cleavage peel strength.

The purpose of this research the study of the potential of Suphanburi area for planting investment. In which the researcher has studied the soil data set that is different in each area of Suphanburi. That is quite diverse if divided by each district in Suphanburi province themselves from the basic information report in Suphanburi and the agricultural information of Suphanburi for the year 2017 when comparing with the soil set of Suphanburi it can be seen that the cultivation is quite comprehensive all. The researcher created a model. Mathematical model to calculate production costs and forecasting of plants suitable for cultivation According to the potential of Suphanburi area. In the form of a website for ease of use as much as possible.

The purpose of the study was set to analyze the current situation of human resource cost management of tourism business of community enterprises in the lower central region. The study was examined through the perspective of a group of experts scrutinizing future feasibility of human resource cost management of tourism businesses of the lower central region community enterprises. The data were examined by delphi techniques with the data collected through the interviews and questionnaires from three different data collections. The data analysis was completed using means of descriptive median and consistency then confirmed the result with by the interquartile range calculation. It was found that the key components included 1. Mechanism skill cost 2. Management skills cost and 3. Effectiveness skills cost for the determination and validation of future forms of human resource cost management model in tourism business of community enterprises in the lower central region as examined and approved by the experts in all three skills for the feasibility of the future application

The objectives of the study were to produce 3D virtual reality media production for public relations of Rajamangla University of Technology Phra Nakhon and to study the satisfaction of the 3D virtual reality Media. This research was research and development. The data was collected from a sample of 400 samples. Data was analyzed by mean and standard deviation (S.D.). The results showed as follows: the sample group had the satisfaction to 3D Virtual Reality Media for Public Relations of Rajamangla University of Technology Phra Nakhon was at a high level.

Guide line to promote Decision for occupation choosing: Hospitality Students in faculty of liberal arts Rajamangkala University of technology Phra Nakhon for factors education that was effected to make decision for occupations and Guide line create to promote decision making for hospitality student. The population of the study are 70 hospitality student. Objective 1: The study of general information of respondents showed that the majority of the respondents were female they were study communicative achievement for seven semesters representing 3.00-3.49 They stayed in Bangkok the most parent occupation of respondents was merchants and private business. Moreover A monthly income less than 30000 baht. They need to get job certainly after graduated. The majority of the respondents chose to work in hotel and lodging. Finally the organization factor most effected with students. Objective 2: From an interview with 3 hotels that present the wisdom skill after employment the student have quickly energetic learning; In personality there are properly personalize with appropriate best grooming and always follow an office regulation In the human relationship and responsibility the students were adjusted to live with others and keep responsible very well. They always finished his job even over time.