We have designed and constructed a brand new of a dish solar tracking system. This hybrid system is composed of a sensor module and a local clock time equation systems, and they all work together whatever the weather conditions are. Experimental results from this system show that the tolerances of the azimuth and altitude angles are not over ±2º showing a high accuracy of the system when we have performed this system in Bangkok, Thailand. Moreover, the measured temperature from the solar receiver is 508.25K. This system is then expected to work well with the solar collector for the electric power conversion in future.
This contribution is aimed at designing the optimal thickness of lead-iron double-layer container to store a radioactive waste releasing the photon energy at 1.3325 MeV and initial radiation intensity at 100 mSv/hr using the optimization design by MATLAB software. This design consisted of three parts of calculations to achieve 1000 times the radiation attenuation of container. The first was the logarithmic interpolation for the mass attenuation coefficient. The second was the bilogarithmic interpolation for the exposure buildup factor. The third was the contour-plotting analytical technique for the optimal thickness of radiation container. The values of mass attenuation coefficient and exposure buildup factor were exactly validated as compared with the standard reference database. Furthermore, we have found that the optimal thickness was 3.2 cm for lead (1st layer) and 17.0 cm for iron (2nd layer). Container weight was 994.30 kg, whilst container cost was 167.30 USD. The benefit of our design can quickly and precisely apply for the radiation safety assessment of the occupational radiation workers who always work in the nuclear reactor area.
Abstract. The measurement of moisture content in soil is based on the principle of neutron back scattering. In this principle, when fast neutrons emitted from a radioactive source collide with hydrogen atoms their energies are much greater reduced than colliding with other elements. The number of slowed down neutrons, hence, represents the number of hydrogen atoms present in the vicinity of the source. As water is the main contributor of hydrogen atoms in a soil medium, the moisture content in soil, therefore, can be measured based on this principle. An in-house developed probe containing a source of fast neutrons and a slow neutron detector was inserted into soil at different depths under the ground level. The probe was made of high density polyethylene and connected to a suitably calibrated detection system by a single cable. The moisture content was determined from the slow neutron count rate. The results of field measurement tests were reported and discussed.
In this article, we simply design the solar tracking system and construct a solar collector system for year 2015 in Bangkok, Thailand. The analytical model is calculated via altitudes and azimuth angles of the sun. Our experimental result is agreement well with the calculation in terms of altitude and azimuth. This solar tracking system is therefore applied to a dish solar collector showing the thermal energy of 961.69 W at a maximum temperature of 543.3K with a maximum electric power of 3.395W from our thermoelectric modules.
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