Naphthalene crystal shape prediction from molecular dynamics simulations

We used molecular dynamics simulations to predict the steady state crystal shape of naphthalene grown from ethanol solution. The simulations were performed at constant supersaturation by utilizing a recently proposed algorithm [Perego et al., J. Chem. Phys., 142, 2015, 144113]. To bring the crystal growth within the timescale of a molecular dynamics simulation we applied Well-Tempered Metadynamics with a spatially constrained collective variable, which focuses the sampling on the growing layer. We estimated that the resulting steady state crystal shape corresponds to a rhombic prism, which is in line with experiments. Further, we observed that at the investigated supersaturations, the $\{00\bar{1}\}$ face grows in a two step two dimensional nucleation mechanism while the considerably faster growing faces $\{1\bar{1}0\}$ and $\{20\bar{1}\}$ grow new layers with a one step two dimensional nucleation mechanism

Coworkers, Networks, and Job Search Outcomes

Social networks are an important channel of information transmission in the labor market. In this paper investigate how displaced workers searching for new jobs benefit from information provided by their former coworkers. In line with the theoretical and empirical literature we find that the employment status networks members matters for the job finding rate. We further analyze the mechanisms through which employed contacts affect job search outcomes and find that (i) the types of firms at which the contacts work are important and (ii) contacts with similar characteristics as the displaced worker lead to better outcomes. Our findings strongly indicate that job referrals from network members are the main mechanism by which social contacts influence job search outcomes