As the worlds energy resources are currently insufficient to meet human needs energy-saving and energy-efficient appliances have to be invented that are readily available and accessible to everyone. To have enough energy to meet human needs and to reduce the waste from the waste of energy resources each year to meet the demand for energy that can be produced by itself. This research presents the construction of a portable DC to AC voltage converter or “Constrution of Portable DC to AC Voltage Converter” which can be operated through a solar cell. By charging energy from the sun and storing energy at the battery. and can also bring electrical energy to use inside the pressure converter There is an inverter circuit that converts voltage from DC to AC so that AC power can be used in daily life. which has a lighting system power socket USB port and helps reduce electricity bills in the house and is convenient to carry From the experimental results of creating a portable DC to AC voltage converter it can be used in daily life and saves electricity and is also clean energy from sunlight that does not cause pollution like a generator that uses oil. be a generator

In this study we investigated the effects of Sm2O3 addition in ceramics 0.93(Bi0.5- x/0 . 9 3Smx/0 . 9 3Na0 . 5 ) TiO3 - 0 . 0 7 BaTiO3 by mixing solid oxide solutions. The crystalline properties of the X-ray diffraction and ferroelectric properties were studied from the P - E loop. The physical properties showed that BSNT-BT ceramic density increased and the percentage of shrinkage decreased due to the increase of the amount of Sm2O3. Moreover it was found that the results were consistent with the structural study for sintered samples at a temperature of 950 °C for 7 hours. It can be determined that the BSNT-BT ceramics have a perovskite structure which is like the main structure of ceramic type BNT. Dielectric properties and dielectric losses at room temperature showed that when increasing the amount of Sm2O3 in BSNT-BT ceramics the dielectric and low dielectric loss were consistent with reduced material resistance. Further the ferroelectric test found that BSNT-BT ceramics improved the ferroelectric properties when increasing the amount of Sm2O3 in the BSNT-BT ceramics.

In this study the wind speed characteristic and evaluation of wind power generation at Samoeng district Chiang Mai were investigated using wind speed data and wind direction data during time of January 2011 to December 2011 and measured at a height of 20 40 and 80 m above ground level. It was found that the mean wind speed of 3.8 3.92 and 4.30 m/s. While the mean wind direction of 20.73% and indicating from the southwest. The mean of power density of 107 W/m2 the shape parameter (k) was 1.715 1.633 and 1.783 scale parameter (c) of 3.649 3.651 and 4.092 m/s the mean of wind shear coefficient was 0.19. The evaluation of wind energy for electricity generation by install the wind turbine of Nordex N50 from Germany and Vestas V90 from Denmark were capacity of 800 kW and 3 MW. It could produce annual electricity of 1761379 kWh and 3772400 kWh and the capacity factor show 25.13% and 14.35% respectively. Finally the results showed the northern area of Thailand was suitable for wind power development in further.

This is the study of a conductive sheath-core bicomponent fibers. The intentions of the experiments were to investigate feasibility of conductive sheath-core bicomponent fiber forming using selected materials and the fibers’ properties. The trails were to extrude the bicomponent fibers with conductive materials in sheath section and supporting materials in core section. The conductive carbon black was selected as conductive material to compound with polypropylene. The virgin polypropylene was chosen as core material in the fibers. It was problematic to form fibers using the conductive carbon black polypropylene compound alone therefore the virgin polypropylene was used as the core section in the fibers to promote production stability. The sheath-core carbon black compound bicomponent fibers were steadily produced with designated machine settings. The produced fibers were tested for their physical and mechanical properties and electrical conductivity. The results shows that the fibers with the carbon black polypropylene compound as the fibers’ sheath section and the virgin polypropylene as the fibers’ core section have conductive property. The conductivity of the fibers increased when their sheath sections were thicker as the ratio of the carbon black compound become higher. Even though thicker sheath section of the fibers (40% and over) have higher conductivity the physical properties of the fibers become weaken and less applicable as textile fibers.

The application of integrated energy use in the agriculture sector It is presented in the form of using renewable energy from solar energy to produce electricity to use in conjunction with other sources of electricity such as generators or electric power systems. Using solar panels or solar cells the size and number of panels does not exceed 300 watts 4 panels and the electrical system of the electrical system. Supply electric power to the water pump size does not exceed the rating of 1500 watts 220 volts. Solar power supply systems alone may be affected by weather conditions or electrical power supplies. Including the quality of electricity obtained from solar energy and will result in the water pump not working efficiently. Therefore the application of solar energy by using a power supply system from 2 sources by using a hybrid inverter device to select the power supply from the solar cell is the main power and the power supply from the memory system is the backup power. Therefore a research project on the application of solar water pumps in a mixed system for agriculture is proposed to increase the efficiency of electric power distribution. This application of solar water pump hybrid system for agriculture when used with water pumps can normally help to save electricity and can also use solar energy instead of using electricity to pump water. Let the water pump and can work efficiently.