Creació i manteniment de la diàspora irlandesa: història d'un país abocat a l'exterior

International audienceLa història de la diàspora irlandesa està entrellaçada amb la del Govern colonial anglès i, després de la independència irlandesa, amb la interdependència postcolonial. Durant el període de 120 anys que va des de 1801 a 1921, uns vuit mi- lions de persones van emigrar d’Irlanda, i la tendència migra- tòria només es va invertir ben bé a final del segle XX. Ara és probable que la mort del que s’havia anomenat el Tigre Celta –tot i que, mirant les coses retrospectivament, que potser va ser alguna cosa més que un tigre de paper?– donarà lloc una altra vegada al fet que emigrants irlandesos busquin refugi econòmic en les comunitats de la diàspora ja establertes, o en noves comunitats.The story of the Irish diaspora is intertwined with that of English colonial rule and after Irish independence with post-colonial interdependence. During the 120 year period stretching from 1801 to 1921, some eight million people emigrated from Ireland, the migratory tendency only being reversed in the very late twentieth century. It is now likely that the economic demise of what had been called the “Celtic Tiger” - but in retrospect was it only ever a paper tiger ? - will once see again young Irish emigrants seeking economic refuge in established diasporic communities, or in new ones

Charge storage characteristics of ultra-small Pt nanoparticle embedded GaAs based non-volatile memory

Charge storage characteristics of ultra-small Pt nanoparticle embedded devices were characterized by capacitance-voltage measurements. A unique tilt target sputtering configuration was employed to produce highly homogenous nanoparticle arrays. Pt nanoparticle devices with sizes ranging from ∼0.7 to 1.34 nm and particle densities of ∼3.3–5.9 × 1012 cm−2 were embedded between atomic layer deposited and e-beam evaporated tunneling and blocking Al2O3 layers. These GaAs-based non-volatile memory devices demonstrate maximum memory windows equivalent to 6.5 V. Retention characteristics show that over 80% charged electrons were retained after 105 s, which is promising for device applications

: Zwischen Welten Denken: Diskussionsrehe - Arif Dirlik in Gespräch mit Gregory Lee

Gregory Lee "Initial Remarks", in part amended by hand 5 June 2001. Amendments added to the original document 28 August 2019.International audienceSee PDF document in German at https://gregorybarrylee.weebly.com/uploads/1/1/4/7/11477410/berlin_lee_dirlik.pd

Knowledge-based vision and simple visual machines

The vast majority of work in machine vision emphasizes the representation of perceived objects and events: it is these internal representations that incorporate the 'knowledge' in knowledge-based vision or form the 'models' in model-based vision. In this paper, we discuss simple machine vision systems developed by artificial evolution rather than traditional engineering design techniques, and note that the task of identifying internal representations within such systems is made difficult by the lack of an operational definition of representation at the causal mechanistic level. Consequently, we question the nature and indeed the existence of representations posited to be used within natural vision systems (i.e. animals). We conclude that representations argued for on a priori grounds by external observers of a particular vision system may well be illusory, and are at best place-holders for yet-to-be-identified causal mechanistic interactions. That is, applying the knowledge-based vision approach in the understanding of evolved systems (machines or animals) may well lead to theories and models that are internally consistent, computationally plausible, and entirely wrong

Multiaxis thrust vectoring using axisymmetric nozzles and postexit vanes on an F/A-18 configuration vehicle

A ground-based investigation was conducted on an operational system of multiaxis thrust vectoring using postexit vanes around an axisymmetric nozzle. This thrust vectoring system will be tested on the NASA F/A-18 High Alpha Research Vehicle (HARV) aircraft. The system provides thrust vectoring capability in both pitch and yaw. Ground based data were gathered from two separate tests at NASA Langley Research Center. The first was a static test in the 16-foot Transonic Tunnel Cold-Jet Facility with a 14.25 percent scale model of the axisymmetric nozzle and the postexit vanes. The second test was conducted in the 30 by 60 foot wind tunnel with a 16 percent F/A-18 complete configuration model. Data from the two sets are being used to develop models of jet plume deflection and thrust loss as a function of vane deflection. In addition, an aerodynamic interaction model based on plume deflection angles will be developed. Results from the scale model nozzle test showed that increased vane deflection caused exhaust plume turning. Aerodynamic interaction effects consisted primarily of favorable interaction of moments and unfavorable interaction of forces caused by the vectored jet plume

Beyond Limitstowards a new cultural imaginary

The need for the implementation of limits — to production, to consumption, to our domination of ‘Nature’, to the wielding of power — has, with humanity’s belated collective awareness of its planet’s climate crisis, become urgent. But are limits alone sufficient to change the more disastrous possible outcomes, and even if they were by what political mechanism can they be brought about ? This article shows how the dual movement of capitalism and unbridled techno-science (Ellul, Charbonneau, Castoriadis) has unrelentingly propelled humanity towards a stage in its history where limitation is already too late to save the system as we have known it. Global society must now fundamentally alter its use of the planet’s ressources and create a new culture in which production and futile labour (Rensi, Gorz) give way to a way of life that not only respects humanity’s environment but humans themselves. To achieve such a cultural shift, power itself must be bridled (Castoriadis, Zhuangzi, Billeter) and a new popular, democratic practice put in place.Publisher PDFPeer reviewe

Editorial

A city whose streets resound with the languages of Europe and Asia, a city where people are glad to talk to you in either English or French, a city where the local language reigns over the national in the schools, on the market place, on the street signs, and in the television studio. It is obvious that I am talking about no place in France. Even before the Jacobin-inflected French revolution, linguistic homogenization was inherent in the centralizing impulse of the dominant tendency that mon..

Introduction

Une ville dont les rues résonnent de toutes les langues d’Europe et d’Asie, une ville où les gens sont ravis, quand ils le peuvent, de s’adresser à vous en anglais ou en français, et où la langue locale se substitue à la langue nationale dans les magasins, sur les panneaux des rues et dans les studios de la télévision. L’endroit dont je parle ne se trouve bien évidemment pas en France. En effet, même avant la Révolution jacobine française, l’homogénéisation linguistique était inhérente à l’im..

Scalar Mesons a0(1450) and sigma(600) from Lattice QCD

We study the a0 and sigma mesons with the overlap fermion in the chiral regime with the pion mass as low as 182 MeV in the quenched approximation. After the eta'pi ghost states are separated, we find that the a0 mass with q\bar{q} interpolation field to be almost independent of the quark mass in the region below the strange quark mass. The chirally extrapolated results are consistent with a0(1450) being the u\bar{d} meson and K0*(1430) being the u\bar{s} meson with calculated masses at 1.42+_0.13 GeV and 1.41+_ 0.12 GeV respectively. We also calculate the scalar mesonium with a tetraquark interpolation field. In addition to the two pion scattering states, we find a state at around 550 MeV. Through the study of volume dependence, we confirm that this state is a one-particle state, in contrast to the two-pion scattering states. This suggests that the observed state is a tetraquark mesonium which is quite possibly the sigma(600) meson.Comment: 11 pages, 9 figures, accepted for publication in Phys. Rev.

Vortices and extreme black holes: the question of flux expulsion

It has been claimed that extreme black holes exhibit a phenomenon of flux expulsion for abelian Higgs vortices, irrespective of the relative width of the vortex to the black hole. Recent work by two of the authors showed a subtlety in the treatment of the event horizon, which cast doubt on this claim. We analyse in detail the vortex/extreme black hole system, showing that while flux expulsion can occur, it does not do so in all cases. We give analytic proofs for both expulsion and penetration of flux, in each case deriving a bound for that behaviour. We also present extensive numerical work backing up, and refining, these claims, and showing in detail how a vortex can end on a black hole in all situations. We also calculate the backreaction of the vortex on the geometry, and comment on the more general vortex-black hole system.Comment: 28 pages revtex, 10 figures, minor changes, reference adde