จำนวน Repository ( 127 )
เครื่องกำเนิดไฟฟ้า 5 เฟสแบบเส้นแรงแม่เหล็กไหลตามแนวแกนเพลาขนาด 1 กิโลวัตต์ ประยุกต์ใช้กับพลังงานลมผลิตไฟฟ้า
This research project presents about the design and construction of a five-phase generator for producing magnetic force along the shaft axis that there are various important elements which should be considered in the processes of the design and construction such as flux per pole number of poles number of turns rotor speed and winding coefficient of coils. The experiment result is found that the five-phase axial flux permanent magnet generator along the shaft axis can produce DC voltage by the efficiency without load and with load. Furthermore this contribution can be used to produce electricity with other renewable energy such as electricity from wind energy.
Drying kinetics model of fermented soybean meal using hot air-drying
The aim of this research was to model the hot air-drying (HAD) of fermented soybean meal (FSBM) containing probiotic Enterococcus faecium . The HAD was performed to reduce the moisture content of the FSBM. The effects of drying temperature on cell viability and moisture content were investigated. Moisture content decreased rapidly with increasing drying temperature. This probiotic strain’s cell viability slightly decreased at drying temperatures lower than 50°C and was greatly decreased at 55°C. Four mathematical models were applied to describe its drying kinetics revealing that the Page model was the best fit for characterizing the drying kinetics during drying of FSBM with a coefficient of determination (R2) of 0.9996. Moreover the Page model provided the lowest root mean square error (RSME) and chi-square (X2) and the highest modeling efficiency
การศึกษาประสิทธิภาพทางแม่เหล็กจากวัสดุคอมโพสิต ที่ใช้ในอุตสาหกรรม
The magnetic properties of Ba2FeMoO6 (BFMO) BaCO3 (Barium carbonate 99.9%) Fe(NO3)3.9H2O (Iron(II) nitrate 99.0%) and Mo03 (Molybdenum trioxide 99.0%) have been characterized. A slurry was prepared by mixing the powders with deionized (DI) water at a ratio of 1:7.5: by solid state reaction method through compression. In the case of BFMO sintering at 800 °C for a 4 6 and 10 hours. exhibited the largest hysteresis loop at 50 K. In addition the values of Ms and Mr indicate ferromagnetic behaviour in BFMO ceramics sintered from 600 °C to 800 °C. Finally the value of magnetization was reduced by using a lower sintering temperature SEM analysis revealed the physical appearance of sintered BFMO ceramic and showed the morphology of the BFMO powder was. coarse with an average diameter of 2 microns
การสื่อสารสังคมออนไลน์และการสื่อสารแบบปากต่อปากที่มีผลต่อพฤติกรรมในการเข้าใช้บริการคาเฟ่สัตว์เลี้ยงในเขตกรุงเทแมหานคร
This research aimed to 1) study social networking communications and wordof-mouth communications that affected consumer behavior in visiting pet cafés in Bangkok; and 2) study attitudes toward using services that affected consumer behavior in making a decision to visit pet cafés in Bangkok. The sample group in this research consisted of 400 people who visited pet cafés in Bangkok with questionnaires as the research tool to collect data. Statistics employed were frequency percentage average and standard deviation as well as multiple regression analysis and the level of statistical significance at .01. The research results found that : Most of the questionnaire responders were women accounting for 59.25 percent; between 21-30 years of age accounting for 56.50 percent; single accounting for 7 2 .5 0 percent; undergraduates accounting for 69.00 percent; earning monthly income of 10001-20000 baht accounting for 37.75 percent; and residents of detached houses accounting for 31.75 percent. When testing the hypotheses it found that social networking communications and word-of-mouth communications affected consumer behavior in visiting pet cafés in Bangkok at the statistically significant level of .01. Emotional and behavioral attitudes affected consumer behavior in visiting pet cafés in Bangkok at the statistically significant level of .01.
การประเมินประสิทธิภาพการส่งข้อมูลของโพรโทคอลอาร์พีแอลในเครือข่ายเซ็นเซอร์ไร้สายภายใต้สภาพแวดล้อมจริง
This research is aimed to establish the small wireless sensor network under the real environment. The objectives this research is aimed to study the data transmission and evaluate the data transmission performance of RPL protocol in wireless sensor network. Four nodes of wireless sensor network have been installation and transmissions between nodes in single-hop and multi-hop have been simulation for testing and analyzing data from the network following the transmission performance index. The research found that the number of hop and building environment are the principle factor to the performance of RPL protocol this might be the major limit to implement the RPL protocol in wireless sensor network