Qualitative models for planning: A gentle introduction

Qualitative modeling is the study of how the physical world behaves. These physical models accept partial descriptions of the world and output the possible changes. Current systems assume that the model is static and that physical entities do not effect change into the world. An approach to planning in physical domains and a working implementation which integrates qualitative models with a temporal interval-based planner are described. The planner constructs plans involving physical qualities and their behavioral descriptions

Using new literatures as a resource in fostering cross cultural awareness

This paper is based on the premise that the wealth of new literatures in English that are available in several countries of Asia and South East Asia today can serve not only to provide students access to the rich and varied cultural life of the people in these settings, but also help develop in them sensitivity and empathy towards other cultures. Given that English no longer belongs to any one nation or culture, and is increasingly being used in numerous multilingual and multicultural settings worldwide, it is fast becoming ‘re-nationalised’ (McKay 2000), as it takes on new cultural associations, experiences and values. In teaching English as an international language (EIL), therefore, it no longer makes sense to place an exclusive focus on target culture knowledge alone. The paper makes a strong case for including other cultural materials, especially those from Asian and South East Asian literature, in the selection of content and topics for textbooks constructed for use in EFL/ESL contexts, with a particular focus on fostering cross-cultural tolerance and understanding, a neglected area in ELT. Further, the paper goes on to illustrate how texts from these new literatures may be used in promoting cross-cultural understanding in the language classroom. Only recently has cross–cultural understanding begun to receive the kind of attention it deserves in the realm of EFL and ESL teaching/learning. Indeed, for a long time culture itself was considered peripheral, or at best, no more than a supplementary diversion (Tseng, 2002) to the teaching and learning of language, although cross-cultural variation has continued to be a live and productive topic of study in sociolinguistic and pragmatic research. Even where cultural aspects of language study have been addressed in EFL/ESL, traditionally this has pertained exclusively to target language culture. Given the insight that language and culture are inseparable, and that therefore, to teach language is to teach culture,the belief prevailed that in order to gain full competence in the language learners of English in different parts of the world need to internalize the cultural norms of native speakers of English – that is, speakers of English from the Inner Circle (Kachru, 1989) or BANA (namely, British, Australasian and North American) countries (Holliday, 1994)

Naturalistic Metaphysics at Sea

In this paper I return to the mid-20th-century debate between Quine and Carnap on the status of metaphysics questions with an eye toward advancing contemporary debates about whether naturalists can coherently undertake substantive metaphysical inquiry. Following Huw Price, I take the debate between Quine and Carnap to hinge, in part, on whether human inquiry is functionally unified. However, unlike Price, I suggest that this question is not best understood as a question about the function(s) of descriptive discourse. This goes along with rejecting a “linguistic conception” of the starting point of metaphysical inquiry, which, although shared by Quine and Carnap, Price gives us no good reason to think is mandatory for naturalists. I sketch two reasons naturalists have to reject a particular manifestation of this linguistic conception in Quine’s work—his criterion of ontological commitment. Finally, I show how these reasons can help us identify the grains of truth in some recent critiques of “mainstream metaphysics of mind.

Neutrino Dark Energy and Moduli Stabilization in a BPS Braneworld Scenario

A braneworld model for neutrino Dark Energy (DE) is presented. We consider a five dimensional two-branes set up with a bulk scalar field motivated by supergravity. Its low-energy effective theory is derived with a moduli space approximation (MSA). The position of the two branes are parametrized by two scalar degrees of freedom (moduli). After detuning the brane tensions a classical potential for the moduli is generated. This potential is unstable for dS branes and we suggest to consider as a stabilizing contribution the Casimir energy of bulk fields. In particular we add a massive spinor (neutrino) field in the bulk and then evaluate the Casimir contribution of the bulk neutrino with the help of zeta function regularization techniques. We construct an explicit form of the 4D neutrino mass as function of the two moduli. To recover the correct DE scale for the moduli potential the usual cosmological constant fine-tuning is necessary, but, once accepted, this model suggests a stronger connection between DE and neutrino physics.Comment: 26 pages, 1 EPS figur

SU(3)-breaking effects in kaon and hyperon semileptonic decays from lattice QCD

We discuss the result of a recent quenched lattice calculation of the K -> pi vector form factor at zero-momentum transfer, relevant for the determination of |V_us| from K-> pi l nu decays. Using suitable double ratios of three-point correlation functions, we show that it is possible to calculate this quantity at the percent-level precision. The leading quenched effects are corrected for by means of quenched chiral perturbation theory. The final result, f+(0) = 0.960 +- 0.005_stat +- 0.007_syst, turns out to be in good agreement with the old quark model estimate made by Leutwyler and Roos. In this paper, we discuss the phenomenological impact of the lattice result for the extraction of |V_us|, by updating the analysis of K -> pi l nu decays with the most recent experimental data. We also present a preliminary lattice study of hyperon Sigma -> n l nu decays, based on a similar strategy.Comment: 17 pages, 8 figures. Based on talks given at: DAFNE 2004: Physics at meson factories, Laboratori Nazionali di Frascati (Italy), June 7-11, 2004; VIII International Conference on "Electron-Nucleus Scattering", Marciana Marina (Italy), June 21-25, 2004; Lattice 2004, Fermi National Accelerator Laboratory, Batavia, Illinois (USA), June 21-26, 2004; ICHEP 2004, Beijing (China), August 16-22, 200