The purposes of this study were 1) Study the participation of the community in tourism development. 2)To know the problems and obstacles in community participation in tourism development. 3)Guidelines for the development of community participation in tourism management Cultural Tourism Community of Old Town by the Phetchaburi River. The instruments used of the study was in-depth interviews with key informants 12 people. The research findings were as follows: Cultural Tourism Community of Old Town by the Phetchaburi River participate in decision making operation benefit and participate in the evaluation of tourism management. Problems and obstacles to community participation: downtime in sync disagreement participation. Guidelines for the development of community participation in tourism management: community participation give precedence to the people in the community emphasis on working according to plan know how to solve problems for development.

Application creation of Petch Nam Sap community enterprise management system Phetchaburi to create application for Petch Nam Sap community enterprise management system To assess satisfaction with community enterprise management system applications using PHP5 HTML5 CSS3 phpMyAdmin to design databases and image editors as a tool for system development and use questionnaires to assess satisfaction with applications. The samples used in the experiment were Ban Nam Sap community. The application created makes the operation more convenient. Data is stored and managed within community enterprises. Statistics using average percentage research results showed that Petch Nam Sap community enterprise management system application Phetchaburi province generated an average efficiency of 4.64 at the highest level. It helps to manage the information of community enterprises. Evaluation of satisfaction with Petch Nam Sap community enterprise management system application. The average deviation of 0.49 is the highest. It shows that the Application for Petch Nam Sap Community Enterprise Management System It can be used in Phetchaburi.

The purposes of this study were 1) Study the factors influencing the development of health tourism sites according to the Ministry of Tourism and Sports standards for the Hot Springs community Nong Ya Plong District Phetchaburi Province. 2) To set guidelines for the development of health tourism sites in accordance with the Ministry of Tourism and Sports standards for the hot spring village Nong Ya Plong District Phetchaburi Province. The instruments used of the study was in-depth interviews with key informants 24 people. The research findings were as follows: Factors influencing development And guidelines for the development of health tourism sites according to the Ministry of Tourism and Sports standards for the Hot Springs community It was found to be divided into 2 main issues: The main standards of health tourism sites Natural hot spring type And the potential to be a health tourism attraction Natural hot spring type.

Defrosting at evaporator panel is one of working cycles in freezer. Power consumption in defrosting does not meet the objective of using freezer therefore the approach to decrease power consumption in defrosting is one strategy for energy saving. Normally the cycle of defrosting in freezer is a constant time that specify by referring to the highest humidity period. With this control concept the problem of temperature exchange is not occurred from ice accumulation at evaporator panel but it makes the over necessity of defrosting process in the low humidity season and cause the unnecessary power usage in freezer. This thesis presents the control approach for defrosting by using the difference of the temperature at evaporator and the temperature at chilling area. By using this approach the defrosting process is operated depend on load and the fan is on or off relate to defrosting time. Test results demonstrate that about 12% of power can be saved by this control approach when compared to constant time control.

A simple flow injection analytical system for an automatic determination of phosphate in water samples using the molybdenum blue method was developed. Samples were injected and mixed with ascorbic acid used as a reducing agent. The absorbance of the resulting molybdenum blue complex was measured at 880 nm by a spectrophotometer. The optimal conditions of this system were 2 mL/min of carrier flow rate 1000 μL of sample volume 60 centimeters of mixing tube length and 0.020 mol/L of ascorbic acid. The proposed method showed reliability high sensitivity spend small amount of reagents and samples and fast sample throughput (52 samples/hour). The limit of detection (LOD) was 0.015 mg P/L of phosphate. Precision obtained injecting a phosphate standard solution of 0.50 mg P/L (n=10) was 1.81%. This system can be applied to determination of phosphate content in surface water samples in Lopburi province by comparing with a standard method. It was found that obtained from the developed system agreed well with the standard method using the pair t-test (tstat 0.04 < tcrit 2.36). This flow injection analysis system has no effect from arsenate and silicate interference for the analysis of natural water samples.