Explore the vast range of titles available.

The study aimed to identify the impact of the proposed training program in the preparation phase using plyometric exercises to develop the explosive ability of the lower limb muscles of football players U17, and to identify the statistically significant differences between pre and post testing in the explosive ability of the experimental group, for that we used the experimental method in the style of equal groups (control and experimental), On a sample of 20 players, after which we performed the necessary statistical treatment and analyzed by the Spss program, the results of the study and found that the proposed training program had a positive impact on the development of explosive ability for football players U17, and also found there are statistically significant differences between pre and post testing in the explosive ability of the experimental group, in addition to that there are statistically significant differences in the post test of explosive ability characteristic between the control and experimental groups.

This study aims to find out the relationship between the link organizational values and Organizational commitment of the staff of the Directorate of youth and sport of M'sila. The most important results: -There is a correlation between the configured values for organizational culture (strength, elite, reward, system) and the Organizational commitment of the staff of the Directorate of youth and sport of M'sila. -There is a correlation between the configured values for organizational culture (efficiency, justice, teams work, effectiveness) and Organizational commitment of the staff of the Directorate of youth and sport of M'sila.

This experimental study explores the impact of Magnetic Activation of Water (MAW) on the fresh and hardened properties of Reused Crumb-Rubber Mortar (RCRM). Eight different mortar formulations were produced, comprising four variants using potable water (DW) and four utilizing MAW, with varying percentages of Reused Crumb Rubber Sand (RCRS) substituted for natural sand at rates of 0%, 4%, 8%, and 12%. The analyses of fresh properties indicated that MAW effectively reduced entrapped air and improved the consistency of the RCRM mixtures. In terms of hardened properties, MAW demonstrated a significant enhancement in compressive strength and hydration kinetics of RCRM compared to those made with DW. This innovative approach of employing magnetic activation not only addresses compatibility and heterogeneity challenges typically associated with rubber-cement mixtures but also offers a viable solution for incorporating waste rubber into cement composites. Ultimately, this research presents a promising avenue for improving the mechanical and physical characteristics of recycled materials in sustainable construction practices.

In this study, we have investigated the removal efficiency of two organic pollutants: methylene blue (MB) and Reactive Blue 19 (RB19) dyes by using a brown marine alga abundantly available on the Moroccan coastlines called Bifurcaria bifurcata (Bif-Bcata). During the experiments that were conducted in batch mode, we have studied the effect of some parameters such as pH, Bif-Bcata mass, contact time, and initial dye concentration in order to optimize the most suitable biosorption conditions. The biosorption tests on Bif-Bcata showed that the equilibrium is reached after 15 min for both dyes MB and RB19. The optimal pH values are 5.6 and 1.0 for MB and RB19, respectively. Kinetic studies revealed that the biosorption of both dyes follows the pseudo-second-order model. The biosorption isotherms demonstrated that the Langmuir model is the most appropriate to describe the biosorption equilibrium for both dyes MB and RB19 with maximum biosorption capacities reaching 2744.5 mg/g for MB and 88.7 mg/g for RB19. According to these results, it is clear that Bif-Bcata can be considered a promising biomaterial to be used as an effective biosorbent for the elimination of cationic and anionic dyes from textile effluents.

This study investigates the effects of using crumb rubber as a partial replacement for dune sand in concrete mixtures. The incorporation of crumb rubber presents promising ecological and economic benefits, particularly for waste management and material sustainability. In this research, up to 5% of the dune sand was replaced with crumb rubber, and the resulting concrete’s fresh and hardened properties were thoroughly examined to evaluate the impact of this substitution on its mechanical characteristics. The findings reveal that concrete mixtures containing crumb rubber exhibit significantly reduced compressive strength, with a comparatively smaller decrease in tensile strength, relative to conventional dune sand concrete. Specifically, at a 5% replacement rate, substantial reductions in compressive and tensile strength were observed at 28 days, amounting to 66.15% and 48.72%, respectively. These performance limitations suggest that crumb rubber-modified concrete may not be appropriate for structural applications. Nevertheless, potential alternative uses, such as in highway median barriers, curbs, or decorative elements, could represent viable applications for these modified concrete mixtures.

This study investigates the seismic performance of reinforced concrete buildings ranging from 5 to 20 stories using nonlinear static pushover analysis. Four shear wall bracing configurations are considered: L-shaped peripheral walls, central core, double central core, and double peripheral core systems, with wall thicknesses of 15, 20, and 25 cm, all subjected to unidirectional lateral loading. Although these configurations are widely implemented in both moderate and high seismicity regions, few comparative studies have assessed their nonlinear seismic resistance. The results indicate that central core configurations provide superior control of inter-storey drift, with a significant reduction in lateral displacements-up to 48% compared to peripheral wall systems. In contrast, peripheral wall systems exhibit higher drift demands, reaching a maximum of 0.124% for 15 cm thick walls. The analysis also highlights the effectiveness of L-shaped walls in mid-rise buildings, particularly those with wall thicknesses of 20 and 25 cm. The study of deformation mechanisms reveals a concentration of plastic hinges and thus stress in L-shaped wall systems and at beam-wall joint regions.