We present computational results showing eccentricity growth in the inner portions of a protoplanetary disc. We attribute this to the evolving surface density of the disc. The planet creates a gap, which adjusts the balance between the 3:1 (eccentricity exciting) and 2:1 (eccentricity damping) resonances. The eccentricity of the inner disc can rise as high as 0.3, which is sufficient to cause i...

A simple analytical model for estimating the fraction (Ωgas) of matter in gaseous form within the collapsed dark matter (DM) haloes is presented. The model is developed using (i) the Press-Schechter formalism to estimate the fraction of baryons in DM haloes, and (ii) the observational estimates of the star formation rate at different redshifts. The prediction for Ωgas from the model is in broad...

The observed strong dark-to-luminous matter coupling [1, 2, 3] suggests the existence of a some functional relation between visible and DM sources which leads to biased Einstein equations. We show that such a bias appears in the case when the topological structure of the actual Universe at very large distances does not match properly that of the Friedman space. We introduce a bias operator ρDM ...

The success of public Social Media has led to the emergence of Enterprise Social Software (ESS), a new type of collaboration software for organizations that incorporates “social features”. Surveys show that many companies are trying to implement ESS but that adoption is slower than expected. We believe that in order to understand the issues with its implementation we need to first examine and u...

This is the first paper in a series where we study the influence of turbulent diffusion and advective transport on the chemical evolution of protoplanetary disks, using a 2D flared disk model and a 2D mixing gas-grain chemical code with surface reactions. A first interesting result concerns the abundance of gasphase CO in the outer regions of protoplanetary disks. In this Letter we argue that t...

We extend a combinatorial encoding of families of pairwise disjoint convex sets in the plane recently introduced by J. E. Goodman and R. Pollack to the case of families not in general position. This encoding generalizes allowable sequences, which encode finite planar point sets. Further we prove several results on realizability questions, and discuss a number of different combinatorial properti...

Multiplicative preconditioning is a popular SVD-based techniques for the solution of linear systems of equations, but our SVD-free additive preconditioners are more readily available and better preserve matrix structure. We combine additive preconditioning with aggregation and other relevant techniques to facilitate the solution of linear systems of equations and some other fundamental matrix c...

We demonstrated high-efficiency all-optical switching in an InGaAsP–InP photonic crystal resonator evanescently coupled with a microfiber. The nonlinearity was based on carrier injection by single-photon absorption of 980-nm pump light. Carrier-induced and thermally induced shifts of resonance wavelengths were observed under continuous-wave pumping. In pulse operation, an instantaneous refracti...

NOTE. Distal cysts are defined as cysts with a low sodium concentration, thereby maintaining a steep gradient between cyst fluid and plasma sodium concentrations. Proximal cysts are defined as those with a sodium concentration not greatly different from the plasma concentration [3]. a Detection limit. a Additional members of the Studio Italiano Trapianti e Infezioni are listed at the end of the...