Continuous and Discontinuous (Stepwise) Variable compression Ratio Engine in one of the most widely acceptable methods in terms of efficiency and performance. Even though this. method was not new. it is still not ready for manufacturing due to many mechanical drawbacks such as heavy weight high inertia force heat accumulation too many component parts vibration leakage of engine oil high energy consumption low precision causes of problems for other part that work together and high cost. Today there are more than 250 patents worldwide the relate to this systim. Thus this paper presents the background of this technology mechanism categories analysis of strength and weakness and summary of highest potential mechanism pattern for line production of new generation engines.

This research aimed to transfer technology of biogas construction for applying the biogas in household. The villagers were instructed and trained about digester construction for applying the biogas produced from cow and pig manure. The produced biogas was used as alternative fuel for cooking in household to replace LPG. The research operation was separated to 3 phases. the first was preparation and introduction. The second was instruction and practical training. The last was monitoring and project evaluation. The number of participants was 30. The number of biogas digester pilot household was 10. From the project evaluation by using the five-rating scale questionnaire it was found that the evaluation about cognition showed the maximun level (x=4.42 S.D. = 0.84). The second was about location duration and food (X = 4.36 S.D. = 0.75). The lowest was about knowledge application (X= 4.28 S.D. = 0.77). For the project evaluation of success it was found that every biogas digester can be used and the produced biogas can be used to replace LPG about 1.8-2 hrs/a day/a housenold. They can save the expenditure about 180-200 Baht/a month/a household. The biogas digester construction cost was about 3000 Baht/a household. So the payback period was 1.38 years.

งานวิจัยนี้นำเสนอการสร้างตัวตรวจจับไร้สาย (Wireless sensor) แบบอัตราต่ำ (Low rate) ที่มีขนาดเล็กราคาไม่แพง ภายในมีส่วนประมวลผล ส่วนติดต่อสื่อสารและส่วนตรวจจับ (Sensing Device) เพื่อใช้ในระบบการเฝ้าสังเกต และตรวจจับการเกิดน้ำท่วม โดยนำมาใช้กับเครือข่ายตรวจจับไร้สาย (Wireless sensor networks : WSN) ข่อจำกัดของตัวตรวจจับอยู่ที่พลังงาน ระยะทางในการติดต่อสื่อสาร และความสามารถในการประมวลผล แต่จะทำงานร่วมกันเป็นเครือข่ายขนาดใหญ่ เพื่อตรวจจับเหตุการณ์ที่ต้องการในพื้นที่ขนาดใหญ่ ที่มีการเข้าถึงลำบากหรือต้องเสี่ยงภัย มีการรับส่งข้อมูลจากจุดตรวจจับ (Sensor Nods) แต่ละจุดรวบรวมและส่งต่อข้อมูลเพื่อนำไปประมวลผลหรือใช้ในการเตือนภัย ในขั้นต้นของการทดลองจะสร้างโนด และหาเปอร์เซ็นต์ของการรับส่งระหว่างโนดหลัก และโนดย่อย

This research presents a study of the resistance to carbonation compressive strength and porosity of concrete containing ground bottom ash. Three different of bottom ash finenesses viz. coarse bottom ash (GBA-1) ground medium bottom ash (GBA-2) and ground fine bottom ash (GBA-3) were used for the study. Portland cement (CT) is partially replaced with ground bottom ash at 0-40% by weight of the bottom ash. The water to binder ratio was kept constant at 0.5. Compressive strength porosity and resistant to carbonation of concrete were investigated. Fine bottom ash has a high potential to be used as a good cementitious material. The results show that the compressive strength and low porosity of concrete improves substantially with partial replacement of Portland cement with fine bottom ash. Concrete mix cement containing 10-20% of fine bottom ash can be used to make cementitious materials. The use of finer bottom ash produces concrete mix with good strength and resistance to carbonation.

The aim of this research is to study with the limited pollution from Robusta coffee grinding process. The pollution behavior is used to design the limited pollution unit by consists of the dry and wet limited pollution unit. By the dry limited pollution unit tangential air cyclone was regarded. In term of the wet limited pollution unit has to 3 chambers by semi-wet chamber wet storage chamber and overflow chamber. However the efficiency of the limited pollution unit another pollution and economic engineering were determined. The results of research found that the rate of coffee grinding was 243 kg/hr and the mass of pollution was 37.3 to 41.9%. By the motion of pollution was projectile with the speed approximate 14.7 m/s and the distance of pollution was 5.25 m. Based on the dry limited pollution unit designed the efficiency of limited pollution just 79.25%. While the wet limited pollution unit can be limited to 100%. The tendency of pH of water in the wet limited pollution unit was increased to pH9 under past in 24 hours. In case of the break-even point must be grinding with 1400473 kilograms and payback period will occur at 2.1905 years.