We have determined stable geometries for pristine Si nanowires grown along their 100 axis through systematic density functional studies. Strikingly, Si nanowires with diameters smaller than 1.7 nm prefer a shape that has a square cross section. This stems from dimerization between corner atoms and also from benign reconstruction patterns that maximally saturate Si dangling bonds.

Excerpt] I estimate a structural model of teams, autonomy, and financial performance, using a cross section of British establishments. My findings suggest that team production improves financial performance for the typical establishment but that autonomous teams do no better than closely supervised or non-autonomous teams. I find that unobserved factors increasing the propensity to adopt teams ...

This paper considers nonparametric estimation of autoregressive panel data models with fixed effects. A within-group type series estimator is developed and its convergence rate and asymptotic normality are derived. It is found that the series estimator is asymptotically biased and the bias could reduce the mean-square convergence rate compared with the cross section cases. A bias corrected nonp...

The cross section asymmetry Σ in deuteron disintegration with linearly polarized light is considered in the framework of the Bethe-Salpeter formalism. Relativistic contributions to the asymmetry are investigated within the approximation, which takes into account the one-body part of the electromagnetic current operator and the dominant positive-energy partial amplitudes of the Bethe-Salpeter ve...

In this work, a reverse trapezoidal cross-section channel shape for single flow PEM fuel cell was examined with computational fluid dynamic (CFD) method. ANSYS Fluent applied to solve electrochemical reactions, potential fields, mass, species, and energy transport equations. Species mass ratio, temperature distribution relative humidity were obtained the as well i-V power density plots. The res...

So far we have assumed that a plastic hinge forms if the bending moment in a critical cross section reaches the plastic limit value, M0. We have tacitly neglected the effect of the other internal forces on the formation of the yield hinge. This effect, however, can be appreciable, for example in multi-storey frames or frames with a large horizontal thrust where the axial forces are large. So, w...

in this work, by using the particle swarm optimization the electron raman scattering for square double quantum wells is optimized. for this purpose, by combining the particle swarm algorithm together with the numerical solution procedures for equations, and also the perturbation theory we find the optimal structure that maximizes the electron raman scattering. application of this algorithm to t...

We study the relative error in conductance calculations, for simulated flow of a single component single phase fluid through a capillary in three dimensions, by the Lattice Boltzmann (LB) method with bounce-back boundary conditions. The relative error with respect to analytical results for capillary cross-sections of circular, triangular and square shapes are calculated as a function of the cro...

BACKGROUND AND AIM: Teeth are always faced with different traumas and all those traumas, which cause teeth to exit their sockets, are classified as avulsion. Avulsion most commonly occurs in 7-11 year olds. If sports tutors have enough information regarding replantation, they could play a significant role in prognosis of treatment. The purpose of this study was to assess physical education teac...