Excess-entropy scaling in supercooled binary mixtures

Supercooled liquids near the glass transition show remarkable non-Arrhenius transport phenomena, whose origin is yet to be clarified. Here, the authors use GPU molecular dynamics simulations for various binary mixtures in the supercooled regime to show the validity of a quasiuniversal excess-entropy scaling relation for viscosity and diffusion

Density-scaling exponents and virial potential-energy correlation coefficients for the (2n, n) Lennard-Jones system

This paper investigates the relation between the density-scaling exponent $\gamma$ and the virial potential-energy correlation coefficient $R$ at several thermodynamic state points in three dimensions for the generalized $(2n,n)$ Lennard-Jones (LJ) system for $n=4, 9, 12, 18$, as well as for the standard $n=6$ LJ system in two, three, and four dimensions. The state points studied include many low-density states at which the virial potential-energy correlations are not strong. For these state points we find the roughly linear relation $\gamma\cong 3nR/d$ in $d$ dimensions. This result is discussed in light of the approximate "extended inverse power law" description of generalized LJ potentials [N. P. Bailey et al., J. Chem. Phys. 129, 184508 (2008)]. In the plot of $\gamma$ versus $R$ there is in all cases a transition around $R\approx 0.9$, above which $\gamma$ starts to decrease as $R$ approaches unity. This is consistent with the fact that $\gamma\rightarrow 2n/d$ for $R\rightarrow 1$, a limit that is approached at high densities and/or temperatures at which the repulsive $r^{-2n}$ term dominates the physics

Emerging Trends in Small Acts of Audience Engagement and Interruptions of Content Flows

This chapter develops a set of findings around audiences’ small-scale acts of engagement with media content made available through digital media technologies. We identify and discuss three articulations of these small acts: (1) one click engagement, (2) commenting and debating and (3) small stories. In contrasting them with more collaborative and convergent productive practices, we further conceptualise these engagements in relation to two main dimensions: effort and intentionality. Lastly, we suggest a conceptualisation of the outcome of these acts which we have labelled interruption. Content flows can be challenged, if not transformed, due to the volume of small acts, which is realised by the producing audiences as well as by mainstream media. Profound changes in the way information is produced and distributed are fuelled by small acts of engagement, and these trends are likely to continue into the futures this book speaks about

Thermodynamics of freezing and melting

Although the freezing of liquids and melting of crystals are fundamental for many areas of the sciences, even simple properties like the temperature–pressure relation along the melting line cannot be predicted today. Here we present a theory in which properties of the coexisting crystal and liquid phases at a single thermodynamic state point provide the basis for calculating the pressure, density and entropy of fusion as functions of temperature along the melting line, as well as the variation along this line of the reduced crystalline vibrational mean-square displacement (the Lindemann ratio), and the liquid's diffusion constant and viscosity. The framework developed, which applies for the sizable class of systems characterized by hidden scale invariance, is validated by computer simulations of the standard 12-6 Lennard-Jones system