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southwestern part of the country ( Fig. 1 ). This site is the most convenient place for wind farm installation because it is the windiest zone in Algeria with the annual average wind speed of about 6.3 m/s [ 5, 6 ]. Fig. 1. (a) Gamesa G52/850 wind turbine

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. [ 15–16 ] investigated the efficiency of the installation of VEDs for reducing the resonant response of a short simply supported railway bridge. Tsai and Lee [ 17 ] developed a finite element model based on fractional derivatives in order to study the

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receiver tubes in a 50 MW concentrated solar power plant ,” J. Solar Energy , vol. 139 , pp. 36 – 46 , 2016 . 10.1016/j.solener.2016.09.017 [9] J. Pytilinski , “ Solar energy installations for pumping irrigation water ,” J. Solar Energy , vol. 21

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Stone columns are used in practice for ground improvement of soft subsoil. Current design procedures of these columns are based on simple empirical calculations. This research project investigates the behavior of a base reinforced embankment constructed on a soft clay layer, which is improved with stone columns. Centrifuge tests were performed in order to gain a deeper understanding of the interaction problem within the structure. Stone columns were constructed in-flight using a newly developed installation tool. First analysis of test data shows a significant change in stress state due to column construction and the influence on the clay behavior.

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The present paper deals with the study of the installation behavior of high-strength bolts under friction. For this purpose an experimental program was conducted to evaluate the energy of these bolts that is dissipated due to tightening and loosening. The total number of tested specimens was 100 bolts furnished to the requirements of AASHTO specification M253M. The turn-of-nut tightening method is applied experimentally to evaluate the pretension and the torque for tightening and loosening of bolts. It is mentioned that a number of 56 bolts has 76 mm length while the rest is of 152 mm. The experimental preloading and the lost torque that overcomes friction are compared with the respective analytical values. It is confirmed that the K-nut factor is affected by the type of lubricant and the length of the bolt. Additionally, most of torque is going to overcome friction. The percentage of tightening and loosening torque for both the analytical and the experimental cases is very close.

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Geothermal energy is the most economical of the green energy resources such as solar or wind. It is a ‘base-load’ type of power, which is constantly available, not just when the sun shines or the wind blows. In Hungary, geothermal energy has proven to be an economical source of energy for direct use. A significant amount of geothermal energy is located throughout Hungary and thermal water (> 30 °C) can be found over 70% of the area of the country. This is supplied mainly from two principal aquifer systems of regional extent. One of them is the clastic Upper Pannonian Quaternary fill of the Pannonian basin, and the other one is the fractured and/or karstified Mesozoic basement. The geothermal situation in Hungary offers two directions for the utilization of geothermal energy. Using the heat from shallow geological sections for heating and cooling buildings; and using thermal sources of low enthalpy thermal waters in several ways (heating and sanitary waters in buildings, greenhouses and aquaculture installations). The potential of geothermal resources and their immediate development should focus on cascade and integrated utilization of geothermal energy. Cascade schemes should be used to fulfil the thermal energy demand for the selected area in order to get the maximum benefit from geothermal energy with the minimum energy demand from heat pumps. The integrated scheme has environmental benefits by using renewable energies (geothermal energy and solar energy), new technologies (heat pumps) and energy savings (cascade scheme). In the long-run, the economic benefits of geothermal power may even exceed those of the fossil fuels. It would likely prove to be a sustainable low-cost source of power. Exploitation of geothermal energy will have a direct impact on the development of the regions, by increasing per capita income and at the same time raising the inhabitants’ standard of living.

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University of Technology in Bartislava , 2011 . [9] Flo-Mate Model 2000 , Installation and Operations Manual, Marsh-McBirney Inc, 1990. [10

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norm on the methods and elements for the operational safety calculation of power installations, NTE 005/06/00, 2006. Lanz B. T., Broussard B. E. Maximizing cable reliability at the lowest possible cost, International

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, (last visited 2 June 2016). [10] Won M. S. , Ju K. S. , Hur D. Optimized installation and operations of battery energy storage

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Pollack Periodica
Authors: Štefan Tkáč, Lukáš Sečka, and Zuzana Vranayová

., Lee D. J., Liu J. H., Chen Z. Z., Kuo Z. Y., Jang, H. Y., You J. J., Tsai J. T., Tsai M. H., Lin W. T., Lee Y. J. Installation and practical operation of the first micro hydro power system in Taiwan using irrigation water in an agriculture canal, IEEE

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