Due to the gap in understanding board leadership and specifically, board shared leadership, this article aims at proposing some antecedents of the emergence of board shared leadership. This article incorporates three bodies of literature: Team effectiveness, team leadership, and board management. Based on integrating several theoretical perspectives, nine propositions are developed in relation ...

We study a mechanical model known as a Galton board--a particle rolling on a tilted plane under gravitation and bouncing off a periodic array of rigid pegs. Incidentally, this model is identical to a periodic Lorentz gas where an electron is driven by a uniform electric field. Previous heuristic and experimental studies have suggested that the particle's speed v(t) should grow as t(1/3) and its...

Storage of hydrogen is one of the key challenges in developing hydrogen economy. Magnesium hydride (MgH2) is an attractive candidate for solid-state hydrogen storage for on-board applications. In this study, 10 wt.% ZrB2 was co-milled with magnesium hydride at different milling times to produce nanocrystalline composite powder. The effect of milling time and additive on the hydrogen desorption...

We present Particle–Particle–Particle–Mesh (PPPM) and Tree Particle–Mesh (TreePM) implementations on GRAPE-5 and GRAPE-6A systems, special-purpose hardware accelerators for gravitational many-body simulations. In our PPPM and TreePM implementations on GRAPE, the computational time is significantly reduced compared with the conventional implementations without GRAPE, especially under the strong ...

lignocellulosic resources of khoozestan province are usable for wood and paper industry. the main questions are that, which places have the best conditions are select for development of wood and paper industries? since, the methodologies of research were analytical and estimated. the research questions were tested by method of analytic hierarchy process (ahp). the results of the research were s...