The faults in a power distribution system do not only impact to power outage directly. They also cause voltage sag problem spread over the system. A single-line to ground fault is about 70% of the overhead system faults. The magnitude and duration of voltage sag causes the economic damage of the system. This paper presents an analysis of the different systems grounding to mitigate the voltage sag in a power distribution system by using the technical analysis system in case of one phase to ground fault. The objective is to minimize voltage drop for users using the simulation with single line to ground fault in distribution system voltage level at 22 kV PEA’s test system by the computer program. The results show that the grounding method can mitigate the voltage sag and reduce the damage of the economic system.

This research to study the possibility of material pozzolan as binder by replacment cement by fly ash (FA) and meta kaolin (MK) some for testing compressive strength flexural strength and impact strength of concrete vary the ratio of water to binder (w / b) of 0.40 and 0.45 and the amount of fly ash to replace cement some 15 % 30 % MK and 35% for 10% 15% and 20% by weight of cement. The sample consisted of a cylinder diameter of 10 x 20 cm beam sizes 10 x 10 x 40 cm and 4 x 4 x 16 cm from the test results showed that the concrete samples at 28 days and w/ b of 0.40 to greater than 0.45 all mixed. the compressive strength by replacing cement with FA increase up to 30 % compression of 382 ksc higher than the 20 percent replace by MK were equal to 354 ksc and 32.48 ksc compared to replace cement with FA 15 % is equal to 31 ksc 30% were equal to 30 ksc and 45% were equal to 23.85 ksc while the MK was replaced by 10% were equal to 40.10 ksc higher than to 15% and 20% respectively. The control sample was replaced with MK by 10% is equal to 111 joules maximum replaced by fly ash more than 30% were equal to 110 joules and MK were 15% fly ash 15 and 45 percent respectively.

The purposes of this research were to assess the combined phytotoxicity of glyphosate and carbendazim which were normally used as herbicide and fungicide contaminated in soil as 100 – 1000 mg/kg on seedling growth of ridge gourd. Both of glyphosate and carbendazim were toxic to shoot and root growth of ridge gourd seedlings. The 50% effective concentration (EC50) on shoot length root length root fresh weight and shoot dried weight of ridge gourd seedlings for glyphosate were 669.4 413.0 574.5 and 241.4 mg/kg respectively whereas for carbendazim were >1000 357.8 >1000 and 71.4 mg/kg respectively. Co-contamination between glyphosate and carbendazim seemed to be antagonistic effect. Both of glyphosate and carbendazim at all concentration were not toxic to chlorophyll content in cotyledon of ridge gourd seedlings.

The research aims to study the quality of Chaiya salted eggs coated with tea waste to partially replace soil from termite mound. The residue of tea waste dried to a moisture content of 14.9% was used to prepare salt coating paste. It was found that the mixture of coating paste by substitution of termite mound soil with 10% (w/w) tea waste was appropriate to coat the duck eggs. The salt content increased in both egg yolk and egg white with increasing salt coating time. Coating egg with 10% tea waste for 24 days egg yolk contained salt 0.83% moisture 17.04% and weighed 19.19 grams. The pH value and hardness were 6.43 and 93.67 gram respectively. The egg white contained salt 5.27% moisture 81.61% and pH value was 7.60. The salted boiled eggs coated by 10% tea waste treatment for 21 days were accepted by the panelists in terms of the overall liking with the level of much liking (8.67) not significantly different (p>0.05) from that of the control treatment (0% tea waste). Microorganisms in the salted boiled eggs did not excess Thai OTOP standard. A hundred general consumers accepted this product in terms of the overall liking with the level of much liking (8.00).

The purpose of this independent study was to investigate factors influencing motivation of Thai tourists visiting Black Sand Beach Laem Ngop District Trat Province. The samples used in this study were 400 Thai tourists who came to visit at Black Sand Beach Laem Ngop District Trat Province. The research instrument was a questionnaire to collect data which were analyzed through frequency percentage average values standard deviation t-test and F-test (One Way ANOVA). The study result indicated that there were more male tourists traveling to Black Sand Beach Laem Ngop District Trat than female. Most of them were single and 21-30 years old earning 15000-30000 baht per month. They lived in other central provinces rather than Bangkok and habitually traveled with the families once or twice. They obtained information from the internet and came for leisure activities that had attractively motivated them to find the adventure visit the natural tourist attractions which were friendly and quiet. In conclusion Thai tourists differed in terms of their demographic characteristics such as gender age occupation income educational level residence and status at the 0.05 level of significance; however their traveling motivation was insignificantly different