Defeasible Logics

Contents 0.1 Introduction : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 1 0.2 Pearl's system Z : : : : : : : : : : : : : : : : : : : : : : : : : : : : 4 0.2.1 Deriving a natural ordering of defaults : : : : : : : : : : : : : 5 0.2.2 System Z + : resolving remaining ambiguities by explicit means 7 0.3 Conditional entailment : : : : : : : : : : : : : : : : : : : : : : : : : 8 0.4 The argument-based system of Simari and Loui : : : : : : : : : : : : 11 0.5 Brewka's preferred subtheories : : : : : : : : : : : : : : : : : : : : 16 0.6 Ordered logic and basic defeasible logic : : : : : : : : : : : : : : : : 19 0.6.1 Implicit version of Nute's basic defeasible logic : : : : : : : : 20 0.6.2 Ordered logic : : : : : : : : : : : : : : : : : : : : : : : : : 24 0.6.3 Explicit version of Nute's basic defeasible l

Acceptability of lamb meat from different producing systems and ageing time to German, Spanish and British consumers

In the present study German (DE), Spanish (ES) and British (UK) consumers' acceptance of lamb from their own country compared to lamb from Uruguay (UY) was evaluated. Two-hundred consumers in each country evaluated tenderness, flavour and overall acceptability of four types of lamb, two from UY (light and heavy lambs aged 20 d) and 2 local (with two ageing times, 7 and 20 d). In each country 1.5 cm-thick slices of lamb were evaluated by previously selected consumers in controlled conditions. DE and UK consumers showed significantly (P < 0.05) different acceptability scores between samples, the lamb from heavier animals and aged 20 d being the most appreciated. On the other hand the majority of the ES consumers significantly (P < 0.05) preferred the meat from lighter lambs. Production systems, cultural aspects and consumption habits seem to affect the acceptability of the lamb to the consumers. © 2005 Elsevier Ltd. All rights resreved