A preference-based semantics for CTD reasoning

In [8] the authors developed a logical system based on the definition of a new non-classical connective ⊗ capturing the notion of reparative obligation. The system proved to be appropriate for handling well-known contrary-to-duty paradoxes but no model-theoretic semantics was presented. In this paper we fill the gap and define a suitable possible-world semantics for the system for which we can prove soundness and completeness. The semantics is a preference-based non-normal one extending and generalizing semantics for classical modal logics.

Influence of roughness parameters and surface texture on friction during sliding of pure lead over 080 M40 steel

In the present investigation, tests were conducted on a tribological couple made of cylindrical lead pin with spherical tip against 080 M40 steel plates of different textures with varying roughness under both dry and lubricated conditions using an inclined pin-on-plate sliding tester. Surface roughness parameters of the steel plates were measured using optical profilometer. The morphologies of the worn surfaces of the pins and the formation of transfer layer on the counter surfaces were observed using a scanning electron microscope. It was observed that the coefficient of friction and the formation of transfer layer depend primarily on the surface texture of hard surfaces. A newly formulated non-dimensional hybrid roughness parameter called 'xi' (a product of number of peaks and maximum profile peak height) of the tool surface plays an important role in determining the frictional behaviour of the surfaces studied. The effect of surfaces texture on coefficient of friction was attributed to the variation of plowing component of friction, which in turn depends on the roughness parameter 'xi'.

Teología, 2003, Tomo XXXIX nº 080 (número completo)

Presentación -- “Dionisio contra el Crucificado” La fe en cristo después de Nietzsche / Olegario González de Cardedal -- La Trinidad en el posconcilio y en el final del siglo XX: Método, temas, sistema / Ricardo A. Ferrara -- El Sentido del Diálogo en Hans Georg Gadamer / Carmen Blazer -- In dulcedine societatis quaerere veritatem / Carlos M. Galli -- La Teología y la eucaristía / Estanislao E. Karlic -- Tesis doctorales argentinas en teología y disciplinas afines (1965-2002) -- Crónica de la Facultad 2002 -- Notas bibliográficas -- Libros recibidos -- Instrucciones para los colaboradores