Optimal design of injection mold for plastic bonded magnet

The optimal design of an injection mold for producing a stronger multipole magnet is carried out using the finite element method and the direct search method. It is shown that the maximum flux density in the cavity obtained by the optimal design is about 2.6 times higher than that of the initial shape determined empirically. 3-D analysis of the nonlinear magnetic field in the injection mold with complicated structure is also carried out. The calculated flux distribution on the cavity surface is in good agreement with the measured one</p

Proceedings of the Second International Colloquium on Regional Development

The present volume contains papers from the "Second Colloquium on Regional Development" which took place in Bardejov, Slovakia in October 1992. A particular focus of this Colloquium was the potential for collaboration in near-border areas, in fact similar to the region where the Colloquium took place. The opportunity to cooperate across national borders has been brought about by the recent political changes in Central and Eastern Europe but to make full use of this opportunity may well be harder than some of the papers of this volume suggest. Nevertheless, some progress can be made quickly, and conferences of this sort do help to advance cooperation. The contributions span issues from economic, societal, and environmental problems to examples of measures, policies, and solutions in some countries. They address issues on national, regional, and local levels from different viewpoints, so that the participants could find topics relevant to their interest

Human Settlement Systems: Spatial Patterns and Trends

The papers in this volume were originally presented at a conference on the analysis of human settlement systems held at IIASA. This meeting closed an IIASA research activity, started in 1975, that had the goals of identifying functional urban regions in several industrialized countries and making comparative analyses of their population and employment trends to enhance our understanding of the spatial and temporal evolution of human settlement systems. This research on human settlement systems and strategies established a wide international collaborative network and created a sizeable data base for examining demographic and economic changes. This book presents the findings of some of this work

Magneto-hydrodynamic Simulations of a Jet Drilling an HI Cloud: Shock Induced Formation of Molecular Clouds and Jet Breakup

The formation mechanism of the jet-aligned CO clouds found by NANTEN CO observations is studied by magnetohydrodynamical (MHD) simulations taking into account the cooling of the interstellar medium. Motivated by the association of the CO clouds with the enhancement of HI gas density, we carried out MHD simulations of the propagation of a supersonic jet injected into the dense HI gas. We found that the HI gas compressed by the bow shock ahead of the jet is cooled down by growth of the cooling instability triggered by the density enhancement. As a result, cold dense sheath is formed around the interface between the jet and the HI gas. The radial speed of the cold, dense gas in the sheath is a few km/s almost independent of the jet speed. Molecular clouds can be formed in this region. Since the dense sheath wrapping the jet reflects waves generated in the cocoon, the jet is strongly perturbed by the vortices of the warm gas in the cocoon, which breaks up the jet and forms a secondary shock in the HI-cavity drilled by the jet. The particle acceleration at the shock can be the origin of radio and X-ray filaments observed near the eastern edge of W50 nebula surrounding the galactic jet source SS433.Comment: 30 pages, 16 figure

Non equilibrium dynamics below the super-roughening transition

The non equilibrium relaxational dynamics of the solid on solid model on a disordered substrate and the Sine Gordon model with random phase shifts is studied numerically. Close to the super-roughening temperature $T_g$ our results for the autocorrelations, spatial correlations and response function as well as for the fluctuation dissipation ratio (FDR) agree well with the prediction of a recent one loop RG calculation, whereas deep in the glassy low temperature phase substantial deviations occur. The change in the low temperature behavior of these quantities compared with the RG predictions is shown to be contained in a change of the functional temperature dependence of the dynamical exponent $z(T)$, which relates the age $t$ of the system with a length scale ${\cal L}(t)$: $z(T)$ changes from a linear $T$-dependence close to $T_g$ to a 1/T-behavior far away from $T_g$. By identifying spatial domains as connected patches of the exactly computable ground states of the system we demonstrate that the growing length scale ${\cal L}(t)$ is the characteristic size of thermally fluctuating clusters around ``typical'' long-lived configurations.Comment: RevTex