Spin Analysis of the Process e+e- --> tau+tau- at LEP

Using the data collected by the four experiments at LEP during 1990-1994, a precise measurement of the tau longitudinal polarisation (P_tau) has been performed, as well as the measurement of the transverse-transverse and transverse-normal tau spin correlations. From the P_tau measurement, assuming lepton universality of the neutral currents, the effective weak mixing angle has been determined to be sin(theta_W) = 0.2325 +- 0.0006. The Standard Model predictions are consistent with the measured results.Comment: Invited talk to San Miniato 1997, 6 pages, 10 figures, Latex, macro espcrc2.sty include

Building ontologies from folksonomies and linked data: Data structures and Algorithms

We present the data structures and algorithms used in the approach for building domain ontologies from folksonomies and linked data. In this approach we extracts domain terms from folksonomies and enrich them with semantic information from the Linked Open Data cloud. As a result, we obtain a domain ontology that combines the emergent knowledge of social tagging systems with formal knowledge from Ontologies

On the motives of moduli of chains and Higgs bundles

We take another approach to Hitchin's strategy of computing the cohomology of moduli spaces of Higgs bundles by localization with respect to the circle-action. Our computation is done in the dimensional completion of the Grothendieck ring of varieties and starts by describing the classes of moduli stacks of chains rather than their coarse moduli spaces. As an application we show that the n-torsion of the Jacobian acts trivially on the middle dimensional cohomology of the moduli space of twisted SL_n-Higgs-bundles of degree coprime to n and we give an explicit formula for the motive of the moduli space of Higgs bundles of rank 4 and odd degree. This provides new evidence for a conjecture of Hausel and Rodr\'iguez-Villegas. Along the way we find explicit recursion formulas for the motives of several types of moduli spaces of stable chains.Comment: 44 page

User profile modelling based on mobile phone sensing and call logs

There are remaining questions concerning user profile modelling in the mobile advertising domain. The research question addressed in this paper is how to design a specific user profile model, that is a simplified model in terms of the amount of user data to be collected, that considers relevant aspects of mobile advertising such as social and personal context, and user privacy preservation. To address this question, a new user profile model consisting of three phases was proposed: (1) data collection, (2) integration and normalization of collected data, and (3) inference of knowledge about the mobile user’s profile. The most significant contributions of the proposed model are a simplified user profile model approach which tackles the dependency on other data sources like OSN platforms and local data gathering and storage that contributes to the user privacy-preserving since the user can exert more control over his/her personal data

Who is afraid of philosophy?

Jo estic aquí per expressar la meva solidaritat amb els meus col · legues i amb els estudiants al Centre de Recerca en Filosofia Europea Moderna, i el meu suport a la campanya «Save Filosofia a Middlesex». Crec que l'èxit nacional i internacional inesperada d'aquesta campanya-que hagués pensat fa només unes poques setmanes que l'anunci del tancament d'un Centre per a la Filosofia en una universitat britànica desencadenaria una reacció d'aquest tipus? té una importació i un impacte que apunten més enllà del cas de Middlesex. Molts de nosaltres, ja sigui estudiants, acadèmics o no acadèmics, estan farts de la manera com la filosofia, les humanitats i l'educació superior de manera més general són tractats pels polítics i administradors, ja sigui a Anglaterra o al continent o en altres parts del món , per exemple a Austràlia

Ali je mogoča radikalna sprememba brez zunaja?

The essay raises the question of radical change in relation to the concepts of atopia and heterotopia. It attempts to provide an answer to the question of radical change by using tools from deconstructive thought, mainly a particular understanding of telepathy.Esej si zastavi vprašanje o radikalni spremembi v navezavi na koncepta atopije in heterotopije. S pomočjo orodij dekonstrukcijske misli – predvsem specifičnega načina razumevanja telepatije – želi odgovoriti na vprašanje o radikalni spremembi

Social tags and linked data for ontology development: a case study in the financial domain

We describe a domain ontology development approach that extracts domain terms from folksonomies and enrich them with data and vocabularies from the Linked Open Data cloud. As a result, we obtain lightweight domain ontologies that combine the emergent knowledge of social tagging systems with formal knowledge from Ontologies. In order to illustrate the feasibility of our approach, we have produced an ontology in the financial domain from tags available in Delicious, using DBpedia, OpenCyc and UMBEL as additional knowledge sources

The quantum H3H_3 integrable system

The quantum $H_3$ integrable system is a 3D system with rational potential related to the non-crystallographic root system $H_3$. It is shown that the gauge-rotated $H_3$ Hamiltonian as well as one of the integrals, when written in terms of the invariants of the Coxeter group $H_3$, is in algebraic form: it has polynomial coefficients in front of derivatives. The Hamiltonian has infinitely-many finite-dimensional invariant subspaces in polynomials, they form the infinite flag with the characteristic vector \vec \al\ =\ (1,2,3). One among possible integrals is found (of the second order) as well as its algebraic form. A hidden algebra of the $H_3$ Hamiltonian is determined. It is an infinite-dimensional, finitely-generated algebra of differential operators possessing finite-dimensional representations characterized by a generalized Gauss decomposition property. A quasi-exactly-solvable integrable generalization of the model is obtained. A discrete integrable model on the uniform lattice in a space of $H_3$-invariants "polynomially"-isospectral to the quantum $H_3$ model is defined.Comment: 32 pages, 3 figure