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Dessalegn C. Dagnew, Christian D. Guzman, Assefa D. Zegeye, Tigist Y. Tibebu, Menelik Getaneh, Solomon Abate, Fasikaw A. Zemale, Essayas K. Ayana, Seifu A. Tilahun and Tammo S. Steenhuis
water conservation activities in the Chemoga watershed, Blue Nile basin, Ethiopia. Land Degradation and Development, 13, 189-200.
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Demie Moore, Stanley Kostka, Thomas Boerth, Mica Franklin, Coen Ritsema, Louis Dekker, Klaas Oostindie, Cathelijne Stoof and Jan Wesseling
: Water conservation on fairways by systematic injection of wetting agents. California Fairways. July/August, 14 , 4, p. 11-12, 14-16.
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Hans Henrik Pedersen, Claus Grøn Sørensen, Frank Willem Oudshoorn, Peder Krogsgård and Lars Juhl Munkholm
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CAMPIGLIA, E. – MANCINELLI, R. – RADICETTI, E. 2011. Influence of no-tillage and organic mulching on tomato ( Solanum lycopersicum L.) production and nitrogen use in the mediterranean environment of central Italy. In Scientia Horticulturae, vol. 130, no. 3, pp. 588–598.
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Stanimir Karapetkov, Lubomir Dimitrov, Hristo Uzunov and Silvia Dechkova
Various methodologies and tools applied to identification of vehicle and collision impact seek to present more and more accurate solutions to reproduce, restore, recreate and investigate the casualty. Modern computer technology and software provide the tools to solve specific problems developing mathematical modelling of complex mechanical systems involving vehicles and other objects in a road accident. Scientists generally utilize the Standard Test Method for Impact Testing calculating the energy of deformation of both vehicles, however, one of its limitations is the evaluation of the kinetic energy of the vehicles in post-collision taking into consideration vehicle rotation and linear displacement. To improve the analysis, dynamic traffic simulation is used, taking into account the variations in the coefficient of friction, suspension elasticity and damping. The proposed method is based on a system of two equations derived from two principles: the Principle of Conservation of Mechanical Energy and the Principle of Conservation of Momentum in the impact phase. The new approach is conducted on mathematical modelling and computer simulation of vehicle motion after the impact, wherefrom the linear and angular velocities are analysed. This is achieved by the numerical solution of the differential equations of motion of the cars after the impact, and the given initial conditions that satisfy the solution are used to solve the system of equations. The main findings of the study can be grouped as follows: 1) The positions of the vehicles prior to the moment of first impact and the post-impact orientation of velocity vectors are more precise. 2) The variability of the tire-road friction coefficient is taken into consideration. 3) The value of coefficient of restitution according to Newton’s theory of impact is unnecessarily determined.
Ibrahim S. Seddiek, Mosaad Mosleh and Adel A. Banawan
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A floating Oscillating Water Column (OWC) wave energy converter, a Backward Bent Duct Buoy (BBDB), was simulated using a state-of-the-art, two-dimensional, fully-nonlinear Numerical Wave Tank (NWT) technique. The hydrodynamic performance of the floating OWC device was evaluated in the time domain. The acceleration potential method, with a full-updated kernel matrix calculation associated with a mode decomposition scheme, was implemented to obtain accurate estimates of the hydrodynamic force and displacement of a freely floating BBDB. The developed NWT was based on the potential theory and the boundary element method with constant panels on the boundaries. The mixed Eulerian-Lagrangian (MEL) approach was employed to capture the nonlinear free surfaces inside the chamber that interacted with a pneumatic pressure, induced by the time-varying airflow velocity at the air duct. A special viscous damping was applied to the chamber free surface to represent the viscous energy loss due to the BBDB’s shape and motions. The viscous damping coefficient was properly selected using a comparison of the experimental data. The calculated surface elevation, inside and outside the chamber, with a tuned viscous damping correlated reasonably well with the experimental data for various incident wave conditions. The conservation of the total wave energy in the computational domain was confirmed over the entire range of wave frequencies.
The blanket research of historical trusses in the territory of Slovakia has been running at our department since 2008. This research is done as teamwork in cooperation with experts from the field of conservation, and it is mainly focused on typology, construction, and the current technical and constructional state of investigated trusses. The long-time support of the grant scheme from the Ministry of Culture allows to get a fair amount of different data related to individual buildings and structures, which enables to carry out the in-depth research. In terms of their conservation and maintenance with an effort to extend their lifetime (the oldest known historical trusses in Slovakia are those of the 13th century), it is necessary to look into the microclimate impact of the under-roof space on wooden roof structures as well as to monitor the contemporary constructional and technical condition of a roof structure itself. The suitable microclimate in the under-roof space is influenced by a number of marginal conditions, constructional solutions of roof details, proper space ventilation etc
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 STN 73 0540-2. (2012). Thermal protection of buildings. Thermal performance of buildings and components. Part 2: Functional requirements. Slovak Republic.
 STN 73 0540-3. (2012). Thermal protection of buildings. Thermal performance of buildings and components
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