This article studies the number of ways of selecting k objects arranged in p circles of sizes n0,...,np−1 such that no two selected ones have less than s objects between them. If ni ≥ sk + 1 for all 0 ≤ i ≤ p − 1, this ...

Epidemiological models and studies of disease ecology typically ignore the role of host condition and immunocompetence when trying to explain the distribution and dynamics of infections and their impact on host dynamics. ...

Objective: In natural populations, infection and condition may act synergistically to trigger a vicious circle: poor condition predisposes to host infections, which further reduce condition, and so on. If this vicious ...

Given the already documented bias in the determination of intersecting remagnetization great circles as a function of the parallelism of the circles, resulting in an elongated bias in that direction, we found that rotational ...

We prove new spectral enclosures for the non-real spectrum of a class of 2 X 2 block operator matrices with self-adjoint operators A and D on the diagonal and operators B and -B^* as off-diagonal entries. One of our main ...

A new modality of Compton Scattering Tomogra-phy is presented. This model is composed of a fixed sourceand detectors placed on a fixed ring passing through thesource. This new modality, called Circular Compton Scattering ...

The Antikythera Mechanism, the ancient mechanical computer of unique technological sophistication dated to the 2nd century B.C., was housed in a wooden case and had dials at its front and back side as well as lots of ...

La iglesia Católica y el Estado Nuevo tomaron en serio la lucha de clases. Creían que la clase obrera brasileña sería capaz de presentarse como alternativa de poder. Ante esta amenaza, implantaron un Estado nacional ...