Ethanol is a form of renewable energy. That can be used as fuel. Can replace gasoline or diesel. Fuel is an important factor driving the countrys economy. Ethanol can be produced from agricultural products garbage and various waste. his research uses watermelon rind. Which is waste from the community as a raw material for the production of ethanol by the fermentation process the microorganisms used in the fermentation process are ball flour. After fermentation for 6 hours it was found that the watermelon rind weighing 10 grams measured the concentration of alcohol. The concentration was 9.3 % VOL 18 Brix %. 20 grams of watermelon rind measuring the concentration of alcohol The concentration of 8.1 % VOL 16 Brix % of watermelon rind at 30 grams measured the concentration of alcohol. Get the concentration 8 % VOL 16 Brix % watermelon rind at 40 grams measure the concentration of alcohol get the concentration of 7.9 % VOL 15.1 Brix % and watermelon rind at 50 grams measure the concentration of alcohol the concentration of 7 % VOL 15 Brix %. Therefore it can be said that the watermelon rind which is waste from the community. Is a raw material with high potential for ethanol production to be used as a renewable energy source Instead of using raw materials from food plants and other energy crops.

The objectives of this research are to study the rate of deterioration of tyre friction coefficient and investigate the quality of new and old tyres that are currently in use. A set of the rolling resistance testing was designed and set up to work with the single dynamometer according to speed 80 km/h tire load 4660 N and inflation pressure 30 psi. There were three tire samples new tire one year used tire and two year used tire to find the rolling resistance coefficients. The finding shows that the rolling resistance was inverse variation with tire aging. For instance the new tire (1st sample) had the highest rolling resistance on the other hand the two year used tire (3th sample) had the lowest rolling resistance. Moreover the rolling resistance coefficients were inverses variation with tire aging. Besides the one year used tire had the average of the decreasing rate of the rolling resistance coefficient at 0.03689 N/kN per a week while the two year had the average of the decreasing rate of the rolling resistance coefficient at 0.03671 N/kN per a week. Furthermore the result also revealed that the rolling resistance coefficients nonlinearly decreased comparing to the tire aging.

The fatigue testing machine that uses the force of torsion is invented to be a compact machine that uses the torsion as the force in the test. From the tests it achieved the highest of 200 newton meters using pneumatics to test the metal materials i.e. the steel S45C molded in accordance with the JIS Z 2274 standard. To find out the capacity of the fatigue testing machine that uses the force of torsion with 8 mm 10 mm and 12 mm diameter test pieces the machine was tested with different levels of the force of torsion and the percentage of the deviation of the tests did not exceed the limit of + 10 percent. This research could reduce the cost of the procurement of the fatigue testing machine that uses the force of torsion and could be used in the instruction in the department of mechanical engineering faculty of engineering Rajamangala University of Technology Phra Nakhon in the future.

Continuing Professional Development for Engineers is any structured process or activity that enhances the competence and quality of a person necessary to perform a professional job. The continuing engineering profession is a useful tool for professionals. The objectives of the research is to find a short course approach for the continuous development of the engineering profession to meet the needs of industrial engineers in the current era to have knowledge and ability in technology continuously it is important that all engineers have to attend training to enhance their knowledge. Which the development of the knowledge of the engineer As part of the promotion of license for professional practice at the ordinary level and degree engineer Including the registration as an ASEAN Engineer and APEC Engineer.

The study of the efficiency of fuel consumption by adjusting the fuel injection pressure is basically one optimization method to maximize the engine combustion. In this current study the Honda wave 110 cc. engine has been used to test in particular the fuel injection by adjusting the pressure of injector. To control the pressure of injection was made by automatic valve injectors with three different pneumatic pressure which were 2 2.5 and 3 bars respectively and the similar running distance of 5km. The results showed that at 2 bars the obtained fuel saving was 1020.68 km/L and the speed at 25.23 km/h which corresponded to the highest CO2 emissions during the engine combustion.