CONTEXT Contraceptive discontinuation contributes to unplanned pregnancy and unwanted births, as well as increased maternal, neonatal and infant morbidity and mortality. Information on differences between women who stop using contraceptives and those who switch to another method would be useful for programs aimed at preventing unplanned pregnancies and their consequences. METHODS Data come fr...

A simple versatile route to polyrotaxanes with a variety of topologies is described through the synthesis and subsequent polymerization of readily accessible and stable rotaxane monomers containing bulky blocked isocyanate stopper groups. Link to download paper: http://onlinelibrary.wiley.com/doi/10.1002/anie.200351458/abstract

Chile is exposed to the occurrence of medium- and large-magnitude earthquakes. As a result, national international design codes have been developed, whose objectives are grant an ideal behavior structures. However, in Chile, many these structures do not comply with construction standards current regulations. Therefore, we propose carry out historical compilation that allows establishing compone...

Given the periodicity of our model problem, it suffices to consider a single period cell (the dotted square in Figure 1), which has side length d. The front of the evolving step in this cell can be described by a simple 1D curve in the plane. We first discretize this 1D curve in space with N grid points, (xi, yi), i = 1, 2, . . . , N , which are uniformly spaced with respect to the arc length, ...

It is well known that at linear ee (ee) colliders using laser backscattering one can obtain colliding γγ, γe beams with energy and luminosity comparable to those in ee collisions. In this paper, it is explained why this can not be done at high energy muon colliders. Due to several physics reasons the γγ luminosity is suppressed here by a factor of 10 ! Another option – γ’s from a linear collide...

Step pinning by immobile stoppers is the most important crystal growth inhibition mechanism. It was first studied by Cabrera and Vermilyea in 1958, who considered the macroscopic effect of a periodic array of pinning sites. However, their analysis (and others since) involved uncontrolled approximations and did not consider what happens when step anisotropy induces faceting. Here we revisit the ...

Natural cork remains a favored option for sealing high-quality wine bottles, despite its high cost wineries. The industry faces the challenge of certifying quality and traceability these corks, with physical–chemical characterization being valuable tool in establishing parameters. While taint compounds must be absent or low concentrations, volatile fraction contains numerous that, even small am...