Bamboo sawdust from chopstick production process was used as substrate for Indian oyster (Phoenix mushroom) cultivation. Experimental studies in cultivation material including wood sawdust bamboo sawdust and fermented chopped straw for 4 experiments - first experiment used 100 % of wood sawdust the second experiment used 25 % of bamboo sawdust mixed with 75 % of fermented chopped straw the third one used 50 % of bamboo sawdust mixed with 50 % of fermented chopped straw the forth one used 75 % of bamboo sawdust mixed with 25 % of fermented chopped straw and the last one used 100 % of bamboo sawdust. All experiments were analyzed for chemical properties nutrients in substrates for mushroom growing and yield of mushroom. The results showed that each type of mushroom substrate with different humidity. pH is suitable for use as a mushroom cultivation material. For quantity of nutrients in bamboo sawdust is more than wood sawdust. Increasing of nutrients is depending on increase fermented chopped straw. For mycelia growth in wood sawdust were faster than a bamboo sawdust culture. Yield of Indian oyster (Phoenix mushroom) found in any treatments. Especially in experiment 3 (50 % of bamboo sawdust mixed with 50 % of fermented chopped straw) is more suitable for Indian oyster (Phoenix mushroom) cultivation which compared to the other treatments because of highest yield mushrooms (175.11 grams per piece).

The purpose of this reserch was study status problems and needs in media utilization of instructors of Rajamangala Institute Technology Chotwet Campus. Reserch gathers information from population 47 instructors. Quastionnaires were reserch tools. Percentage mean and standard deviation were used for data analysis. The result revesled that There was moderate in media utilization Tesching method and instruction were used moderately such as description discussion and demonstration highly used fechnique was experiment. Tools and equipments were used wodeklately such as loud-spesker overhead transparency projector were used highly. Instructional medias were used moderately highly used matenak were transparencies. transparent pens boards and resl meterials. The problem in media utilization was moderately perparation and buying had a moderste problem. High problem was lack of comveniency to produce educational media such as personel officers tools materials equipments buildings places and lack of budget in order to buy educational media. Chosen and use in educational media had a little bit problem but there weremoderately level in time consuming to prepare themselves and complicated to move. Quality and quantity of educational media had a moderste problem such as places rwewnt suitable with media utilization couldnt control the light of projectors amount of educational medias weremt sufficient with needs. SeNice had a moderate problem highly problem were lack of personnel to make photoes slides cassette videotape and lack of personnel to produce graphic chart and portary works for teaching compose not enough. The need of media utilization was highly in tools and equipments. Moderately needs were overhead transparency projectors and transpatent pens. The following needs were opaque projectors and projectors videotapes. Service had highly needs such as buying high quality educational media as a teaching compose The following was preparatory necessary educational media such as overhead transparency projectors loud-speskers and microphones permanency in all of class rooms.

This research is to study the recycle process of hard materials high hardness type and cemented carbide produced by press forming and sintering process included cemented carbide mixed with tungsten carbide cobalt silicon titanium and others. The research aims to recovery tungsten to use it again. It starts in cleaning and ball milling materials for resizing from length 12-25 mm. width 10-15 mm and thickness 2.5-8.0 mm. then disintegrated with the electric-chemical process filtering metal powder cleaning and drying. The result of dissolved materials with electricchemical process in 85% condensed HCl 6-24 volts and 3-10 amperes. The solution heats up 180 degree Celsius is found that material will be 550 11m of W03 the same as usage of Phosphoric Solution. The result of the study in dissolved materials by using the conductor of electricity is found that usage of cobalt is the best to disintegrate tungsten carbide better than tungsten carbide and stainless steel 10-15%. The result of this research is found that the best practice of tungsten carbide recovery is dissolved materials with electric-chemical process in not over 7N condensed HCl 6.00 volts and 3.00 amperes. The metal powder will be almost 100% pure tungsten carbide and particle sized distribution is 34-360 11m. After ball milling for 24 hours particle sized distribution is less than 60 11m compared with the imported metal powder. It is concluded that the recycle of cemented carbide into tungsten carbide powder qualified for sintering work and produced to the durable hard materials. It ensures that this research is useful for the related industry and the approach for production of tungsten carbide which was instead of the imported metal powder.