The Effects of Different Shaped Baffle Blocks on the Energy Dissipation

Stilling basins can be defined as energy dissipaters constructed of the irrigation systems. This study aims at investigating the performance of the new seven baffle blocks design in terms of reducing the dimensions of stilling basins in irrigation systems. In order to assess the hydraulic efficiency of a new model for baffle block used in stilling basins, a Naval Research Laboratory (NRL) has conducted. The results of this study demonstrate that the performance of the new baffle block, in term of hydraulic jump length reduction and hydraulic energy dissipation, it's better than standard blocks. However, the ratios of the drag resistance attributed to the new baffles block (FB / F2) have been larger than that applied on the normal block. It was found that the new block dissipates the energy by 9.31% more than the concrete block, and decreases the length of the hydraulic jump by 38.6% in comparison with the standard blocks. However, the new block maximizes the drag force ratio by 98.6% in comparison with the standard baffle blocks. The findings indicated that in terms of energy reduction and dissipation in the length of the hydraulic jump, the new block is superior to the other kinds

A prospective review on new economic geography

This paper serves as an orientation towards the understanding of some of the contributions and theoretical limitations in New Economic Geography and seeks to provide a prospective assessment of new avenues of research along which the field could improve and develop. We identify many of the persistent features and assumptions which have thwarted the evolution of New Economic Geography and led to a sprawl of criticism within the field. This criticism has opened a discussion towards the identification of new possible directions, some of which are being progressively undertaken, while others raise issues that are difficult to overcome both analytically and empirically.info:eu-repo/semantics/publishedVersio