This comment argues that instead of worrying about the pros and cons of whistleblowing one should focus on the more general problem of the failure of upward communication around safety and quality problems and consider what leaders and managers must do to stimulate subordinates to communicate and reward such communication. The article analyzes why safety failures occur and introduces the concep...

We consider planar upward drawings of directed graphs on arbitrary surfaces where the upward direction is defined by a vector field. This generalizes earlier approaches using surfaces with a fixed embedding in R and introduces new classes of planar upward drawable graphs, where some of them even allow cycles. Our approach leads to a classification of planar upward embeddability. In particular, ...

[1] We use the Global Ionosphere-Thermosphere Model (GITM) to simulate the ionospheric reaction to a simple step change of the high-latitude forcing terms during the first hour of electric field enhancement. In response to the enhanced convection electric field, both the convection velocity and Joule heating increase dramatically. The changes in NmF2 present that the tongue extends across the p...

We investigate a nonlinear three-dimensional model for equatorial flows, finding exact solutions that capture the most relevant geophysical features: depth-dependent currents, poleward or equatorial surface drift and a vertical mixture of upward and downward motions. © 2017 Elsevier Inc. All rights reserved.

Dissociated strabismus complex (DSC) includes dissociated horizontal, vertical, torsional deviation, latent nystagmus and sub-normal binocularity [1]. It is usually bilateral but asymmetric; may manifest spontaneously or with cover testing. As clinical manifestation, DSC is a comitant drift of both eyes: the fixating eye manifests depression, adduction and intorsion and the nonfixating eye mani...

One limitation of Computational Fluid Dynamics based investigations of industrial scale particle flow phenomena is the inability to properly describe the effects of particle-particle interactions. Discrete element methods (DEM) present an opportunity to study such interactions. In flows with higher solids loadings these particle-particle interactions give rise to microstructure formation. Signi...

We study a mathematical model of social diffusion on a symmetric weighted network where individual nodes' states gradually assimilate to local social norms made by their neighbors' average states. Unlike physical diffusion, this process is not state conservational and thus the global state of the network (i.e., sum of node states) will drift. The asymptotic average node state will be the averag...

The paper provides a new proof of the positivity of the optimal marginal income tax, in a more general model, under weaker assumptions. The analysis focusses on the (weakly) relaxed problem in which upward incentive constraints are replaced by a monotonicity condition on consumption. Without upward incentive constraints, nonnegativity of the optimal marginal income tax is straightforward; stric...

In this paper, numerical investigation of upward two phase flow of air-water has been studied. Different conditions of flow regimes including annular, wispy annular, slug, churn and bubbly are simulated based on Hewitt and Roberts map, and a good agreement between the experimental data of the map and the numerical simulation has been observed. Accordingly, a proper CFD model in CFD software of ...

How should you model a process that has drift? ARMA models are intrinsically “stationary,” that is, they are mean-reverting: when the value of xt is above its long-term mean, its next motions will likely be in a downward direction; when it is below its long-term mean the next motion will likely be up. These models also have decaying autocorrelation: the present value is completely forgotten if ...