Controllability properties of a partial di erential equation (PDE) model describing a thermoelastic plate are studied. The PDE is comprised of a Kircho plate equation coupled to a heat equation on a bounded domain, with the coupling taking place on the interior and boundary of the domain. The coupling in this PDE is parameterized by > 0. Boundary control is exerted through the (two) free bounda...

The expression ‘social stratification’ refers to the positions held by individuals and groups in the structures of inequality existing in a society. Specifically, it denotes the classification of individuals and groups into different categories on the basis of the amount of one or more privileges enjoyed by the members of each category and/or the intensity of power that they are able to exert o...

In Computer Supported Cooperative Work (CSCW) environments data and operations can be shared by users and/or they can have their own defined data and operations which may not be shared by other users. The notion of views in (object-oriented) database systems can be applied in CSCW for realizing such environments. In this paper we define two kinds of environments, namely, local and global, by ex...

The implants failure may be caused by micromotion and stress exerted on implants during the phase of bone healing. This concept is especially true in case of implants placed in atrophic ridges. So the primary stabilization and fixation of implants are an important goal that can also allow immediate loading and oral rehabilitation on the same day of surgery. This goal may be achieved thanks to t...

BACKGROUND Shift workers are at greater risk than day workers with respect to psychological and physical health, yet little research has linked shift work to increased sickness absence. AIMS To investigate the relationship between shift work and sickness absence while controlling for organizational and individual characteristics and shift work attributes that have confounded previous research...