This research is aimed at investigating the amount of chromium carbide (Cr23C6) in stainless steel AISI 304 by electrochemical technique testing in calculating the Pa values that corresponding to sensitization stage and the corrosion behavior. The results will carry on to developing the welding process. The specimens were produced with Shielded Metal Arc Welding method. Moreover it was bending at the angle 0 90 and 180 degree and the process finished on post-heat treatment with different cool down conditions are 800ºC annealed in air cooled 1100ºC annealed in water cooled and annealed 1100ºC in air cooled respectively. The results show that: first conditional is appeared the maximum amount of Pa value (Pa > 0.4) indicating that more precipitation of Cr23C6 in heat affected zone (HAZ) of specimen. The second conditional is not found the sensitization stage because when the specimens were annealed at high temperature the chromium carbide will break up and residual stress in HAZ will decrease. At last conditional is found the less amount of Pa value; the reason of using high temperature on annealing process will decrease chromium carbide but slowly air-induced cooling must pass the critical temperature then some Cr23C6 will appear at grain boundary and cause of high corrosion rate. Concerning to the corrosion behavior the second conditional present the lowest corrosion rate corresponding to the better-quality of passive film. Whereas the first conditional shown the highest corrosion rate and low quality of passive film. Thus 1100ºC annealed with water cooled is excellent condition for developing the welding process.

Activated carbon also called activated charcoal or activated coal is a form of carbon that has been processed to make it extremely porous and thus to have a very large surface area available for adsorption or chemical reactions. In this research studies environmental impacts of activated carbon production processes which produced from two types of agricultural by-products namely : coconut shells and palm-oil shells . SimaPro software is applied to evaluate the environmental impacts of both processes. The results have shown that the environmental impacts for the process using coconut shells as raw material is higher than that using palm –oil shells as raw material.

The purpose of this study was to study individual factors of students that effect the production of graduates of Rajamangala University of Technology Phra Nakhon. The survey method by questionnaire was used to collect data from students in their 4th year who were in the 4-year program and 2-year continual program of the university 350 in total. The collected data was analyzed with a statistical software program to calculate the percentage means standard deviations t-test and One-way ANOVA. The level of statistical significance was set at .05. The result reveals that individual factors of students that effect the production of graduates of Rajamangala University of Technology Phra Nakhon were age faculty academic record previous education resident characteristic the relationship of student behaviour learning condition and satisfaction towards graduates production. Meanwhile factors of gender and study program didn’t affect individual factors of students that effect the production of graduates of Rajamangala University of Technology Phra Nakhon

The research involved the characterization of the properties of silver alloys -bearing copper and zinc. The alloys composed of 58.4% silver 20.85-41.76% copper and 0-20.83% zinc respectively. When comparing the characteristics of this alloy and sterling silver 925 the alloy specimen had mechanical properties better than the sterling silver 925. The alloy tests presenting the mechanical values of the hardness shear bond strength elasticity of the specimen were in a range of 54.6-95.3 HV1 209.5-379.3 MPa. 100.6-193.8 MPa. and 32.1-51.7% respectively. While the mechanical values of sterling silver 925 were 52.8 HV1 193.5MPa. 96.0 MPa. and 29.8% respectively. Besides these the microstructure of the alloy specimen showed the dendrite structure. We found that this structure decreased when the concentration copper in the specimen increased. After adding zinc into the alloys the high amount of zinc caused the zinc-rich (alpha) phase changed to Eutectic phase together with the significantly increased area of alpha phase. These effects therefore brought up the better various mechanical properties of the alloys. At the same time the another test specimen composed 58.67% Ag 39.20% Cu and 2.14% zinc. The color level of this specimen was close typically to the sterling silver 925 with the difference of Da at 0.236 and Db only at 5.268. Additionally the higher copper concentration in the alloy provided a value tentatively increased but b value decreased. However more remarkable results were that the zinc showed opposite effects from the copper.

This research aims to study and develop ceramics material using in the wall construction which can be used to proof the heat and water reduce absorbed humidity in the building. The product can save the energy especially the building which is set the air conditioning. The experiment found that the proportion of clay body can be developed and the result of thermal conductivity (K- value) was 0.111 W/ m. /K the permeability was 7 percent the glaze can be used to proof water. The product was compared to three kinds of construction materials which are brick concrete masonry unit and autoclaved aerated concrete found that K- value and permeability were lower. Moreover it can proof water and save more energy for the air conditioning building.