In this paper, we analyze the distribution of the eigenvalues of glued tridiagonal matrices. Such matrices provide a useful class of test matrix because, despite being unreduced, a glued matrix can have some eigenvalues agreeing to hundreds of decimal places. A glued matrix can be obtained from a direct sum of p copies of an unreduced symmetric tridiagonal matrix T by modifying the junctions, i...

2 The memory entitled " Theoretical study of the fluorinating power of SF 6 to vanadocene " corresponds to the work carried out by Luis Martínez Suárez to obtain the Official Master Title on Computational and Theoretical Chemistry, done in the Departament de Química Física of the Universitat de Barcelona and supervised by Dr. Juan J. Novoa Vide, whom certifies and gives his consent to its prese...

Based on the unique traits of biological motion perception, the existence of a “life detector”, a special sensitivity to perceiving motion patterns typical for animals, seems to be plausible (Johnson, 2006). Showing motion displays upsidedown or with changes in global structure is known to disturb processing in different ways, but not much is known yet about how inversion affects attention and ...

Basic role based access control [RBAC] provides a mechanism for segregating access privileges based upon users' hierarchical roles within an organization. This model doesn't scale well when there is tight integration of multiple hierarchies. In a case where there is joint-tenancy and a requirement for different levels of disclosure based upon a user's hierarchy, or in our case, organization or ...

Role-based access control (RBAC) has recently received a lot of attention due to its exibility, expressive power and simplicity in administration. In RBAC permissions are associated with roles and users are made members of roles thereby acquiring the associated permissions. Centralized management of RBAC in large systems is a tedious and costly task. An appealing possibility is to use RBAC itse...

This paper provides a comparative gestural account of nasal vowels in Southern French (Marseille, Toulouse; France) and in Northern French (Liège, Tournai; Belgium). Timing measurements based on acoustic data confirm a different temporal organisation of the gestures between the two regiolects. We also report on statistical comparisons between phonetic events (such as duration of the SF ‘nasal a...