Behaviour of Belgian firms in the context of globalisation : lessons from the conference on “International Trade : Threats and Opportunities in a Globalised World”

The article summarises the main lessons of the Bank’s 2010 conference which focused on international trade and foreign direct investment. The research is based on a microeconomic approach to the behaviour of Belgian firms, with reference to developments in the scientific literature on the subject. Firms active internationally have specific characteristics : they are larger and more productive than firms concentrating on the home market. The costs of entering international markets determine their globalisation strategies, be it in terms of timing, the number of markets canvassed, or the choice between exporting and foreign direct investment. Information technologies have a key role in the development of trade in services, especially for analytical work. It is also shown that, in the face of increased competition from Asian products, firms are tending to concentrate their exports on their leading products and to upgrade quality. The international activities of some firms also have positive repercussions on the productivity and globalisation decisions of firms active solely on the home market. Finally, the impact of globalisation on employment is analysed from various angles. In general, trade with low-wage countries tends to increase demand for skilled labour in Belgium and to reduce demand for unskilled labour. The effects of offshoring are comparable. Finally, while multinationals manage their workforce more flexibly than domestic firms, they have nevertheless been the source of substantial job creation, particularly where the subsidiaries of foreign multinationals are concerned.international trade, foreign direct investment, microeconomic analysis, firm heterogeneity, internationalisation, spillovers, multi-product firms, multinational firms, offshoring, employment, skills

Baby Skyrmions stabilized by canonical quantization

We analyse the effect of the canonical quantization of the rotational mode of the O(3) $\sigma$-model which includes the Skyrme term. Numerical evidence is presented that the quantum correction to the mass of the rotationally-invariant charge $n=1,2$ configurations may stabilize the solution even in the limit of vanishing potential. The corresponding range of values of the parameters is discussed.Comment: 10 pages, 4 figure

General Board Geometry

Game boards are described in the Ludii general game system by their underlying graphs, based on tiling, shape and graph operators, with the automatic detection of important properties such as topological relationships between graph elements, directions and radial step sequences. This approach allows most conceivable game boards to be described simply and succinctly

Le laboratoire maritime du Muséum National d’Histoire naturelle à Saint-servan

Fischer-Piette Edouard. Le laboratoire maritime du Muséum National d’Histoire naturelle à Saint-Servan. In: La Terre et La Vie, Revue d'Histoire naturelle, tome 3, n°10, 1933. pp. 610-615

Supersymmetric WZW σ\sigma Model on Full and Half Plane

We study classical integrability of the supersymmetric U(N) $\sigma$ model with the Wess-Zumino-Witten term on full and half plane. We demonstrate the existence of nonlocal conserved currents of the model and derive general recursion relations for the infinite number of the corresponding charges in a superfield framework. The explicit form of the first few supersymmetric charges are constructed. We show that the considered model is integrable on full plane as a concequence of the conservation of the supersymmetric charges. Also, we study the model on half plane with free boundary, and examine the conservation of the supersymmetric charges on half plane and find that they are conserved as a result of the equations of motion and the free boundary condition. As a result, the model on half plane with free boundary is integrable. Finally, we conclude the paper and some features and comments are presented.Comment: 12 pages. submitted to IJMP

Collision-Induced Decay of Metastable Baby Skyrmions

Many extensions of the standard model predict heavy metastable particles which may be modeled as solitons (skyrmions of the Higgs field), relating their particle number to a winding number. Previous work has shown that the electroweak interactions admit processes in which these solitons decay, violating standard model baryon number. We motivate the hypothesis that baryon-number-violating decay is a generic outcome of collisions between these heavy particles. We do so by exploring a 2+1 dimensional theory which also possesses metastable skyrmions. We use relaxation techniques to determine the size, shape and energy of static solitons in their ground state. These solitons could decay by quantum mechanical tunneling. Classically, they are metastable: only a finite excitation energy is required to induce their decay. We attempt to induce soliton decay in a classical simulation by colliding pairs of solitons. We analyze the collision of solitons with varying inherent stabilities and varying incident velocities and orientations. Our results suggest that winding-number violating decay is a generic outcome of collisions. All that is required is sufficient (not necessarily very large) incident velocity; no fine-tuning of initial conditions is required.Comment: 24 pages, 7 figures, latex. Very small changes onl

Diabetic Patients’ Medication Underuse, Illness Outcomes, and Beliefs About Antihyperglycemic and Antihypertensive Treatments

OBJECTIVE—The purpose of this study was to determine how patients’ beliefs about antihyperglycemic and antihypertensive medications relate to medication underuse and health status