This research work was to study the chemical release of wood/polyvinylchloride composites (WPVC) affecting the physical and chemical properties of water. WPVC specimens in ratio of PVC and wood (100:100 by weight) were prepared by using twin screw extruder. The water conditions for specimen immersion testing were varied for temperatures of 30-70 oC and specimen immersion time of 0-120 h. The water quality was estimated by measuring pH electrical conductivity turbidity and color of water after immersion of WPVC specimen as comparing with case of PVC specimen. The result suggested that pH values of water slightly decreased with increasing specimen immersion time whereas the change of temperature of water did not affect the pH value. The electrical conductivity remained unchanged with increasing specimen immersion time or temperature except for immersion of WPVC specimens at 70 oC. This might be attributed the weak interfacial bonds between PVC and wood and this led to more easily release the metal ions from additives of PVC. The turbidity and color of water for case of WPVC increased with increasing specimen immersion time whereas those for case of PVC did not change. From the results of water quality testing it indicated that WPVC applications which contact with water are safety. This was because water quality after immersion of WPVC specimen is within the effluent standards of pollution control department.

The purpose of this study was to study and compare services marketing mix factors affecting students’ decision to pursue study at undergraduate level in faculty of science and technology of Rajamangala University of Technology Phra Nakhon in 7 aspects: product price place promotion people process and physical evidence. The undergraduates were classified by gender major subjects educational background department of education achievement and domicile. The samples in this research were 93 undergraduates. The study participates selected by stratified random sampling and simple random sampling. The 84 item questionnaires of rating scales was used as the research instrument. Percentage mean standard deviation t - test for independent sample F – test and Scheffe’s test analysis were statistical method to analyze data. The results were as follows: 1. Services marketing mix factors affecting students’ decision to pursue study at undergraduate level in faculty of science and technology of Rajamangala University of Technology Phra Nakhon all aspects were in moderate levels that price was the highest while process and promotion was in the lowest rank. 2. There was significant difference for services marketing mix factors affecting students’ decision to pursue study at undergraduate level in faculty of science and technology of Rajamangala University of Technology Phra Nakhon at the 0.05 level among undergraduates in different gender different academic years different educational background and different achievement. 3. There was non significant difference for services marketing mix factors affecting students’ decision to pursue study at undergraduate level in faculty of science and technology of Rajamangala University of Technology Phra Nakhon in different department of education and different domicile.

The purposes of the research were; 1) to study the relative rotation of AC-generator 2) to study the angular velocities of magnetic coil and permanent magnetic influence generating voltage of AC-generator and 3) to construct predictive equations of generating voltage of AC-generator. By the 12-V 6-pole alternator of motorcycle Pearson’s correlation and regression analysis the findings revealed that: 1) At the lowest relative angular velocity of 376 rpm the generating voltage is 3.28 V. While the highest relative angular velocity of 2280 rpm the generating voltage is 22.98 V. 2) The angular velocity of permanent magnetic has great influences on generating voltage than the angular velocities of magnetic coil at the .01 level of significant and 3) function as below : Generating voltage = 0.806 (Velocity of permanent magnetic) + 0.634 (Velocity of magnetic coil)

The climate change is a natural phenomenon and effect on atmospheric which is the media of wireless communication. For the high performance in the telecommunication system this study therefore aimed to study the variables affecting to signal strength of wireless networks. The values of temperature humidity pressure and the signal strength of wireless networks 5 GHz were measured. The sample of this study was 148 access-points of TOT in Yasothon Province. For statistical analyses Pearsons correlation and regression were employed. The findings revealed that: 1) the average level of signal strength was 69.44 –dBm. The average levels of temperature humidity and pressure were 28.085 ?C 73.145% and 1004.246 hPa respectively 2) variables that had great influences on signal strength of wireless networks consisted of temperature humidity and pressure and 3) ambient variables of temperature humidity and pressure could predict the level of signal strength at 76.8%

The purpose of this research is to study Quality of work life affecting Organizational Commitment of private companies’ employees in Lopburi Province. Sample size in this research is 400 samples. Questionnaire is a tool for data collection. Statistics for data analysis are percentage mean standard deviation t-test one-way analysis of variance and multiple regressions analysis. Research results are as follows: Organizational commitment in the dimension of Strong belief in and acceptance of the organization’s goals has the relationship with Development of Human Capacities and Social Relevance. Organizational commitment in the dimension of Willingness to exert considerable effort on behalf of the organization has the relationship with Adequate and Fair Compensation Development of Human Capacities and Work Life Balance. Organizational commitment in the dimension of Strong desire to maintain membership in the organization has the relationship with Adequate and Fair Compensation Growth and Security and Social integration.