4,431 research outputs found
Development of Fine Fringes Along the Strandlike Domains in the Charge-Density-Wave States of NbSe3 by Electron-beam Irradiation
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Microstructure in the Incommensurate and the Commensurate Charge-Density-Wave States of 2H-TASE2 - A Direct Observation by Electron-Microscopy
No full textTime-Dependent Strandlike Domains in the Charge-density-wave States of NbSe3-An Effect not Induced by Electric-Field
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Direct Observation of Charge-Density Wave Discommensurations and Dislocations in 2H-TaSe2
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The 2D/3D dynamics of wall-bounded low-Rm magnetohydrodynamic (MHD) turbulence
No full textWith this experimental study, we give evidence that the dynamics of low-Rm MHD turbulence depends on the diffusion length l_z, which corresponds to the distance over which the Lorentz force is able to diffuse momentum before it is balanced by inertia
A Bayesian nonparametric approach to modeling market share dynamics
Get PDFWe propose a flexible stochastic framework for modeling the market share dynamics over time in a multiple markets setting, where firms interact within and between markets. Firms undergo stochastic idiosyncratic shocks, which contract their shares, and compete to consolidate their position by acquiring new ones in both the market where they operate and in new markets. The model parameters can meaningfully account for phenomena such as barriers to entry and exit, fixed and sunk costs, costs of expanding to new sectors with different technologies, competitive advantage among firms. The construction is obtained in a Bayesian framework by means of a collection of nonparametric hierarchical mixtures, which induce the dependence between markets and provide a generalization of the Blackwell-MacQueen Polya urn scheme, which in turn is used to generate a partially exchangeable dynamical particle system. A Markov Chain Monte Carlo algorithm is provided for simulating trajectories of the system, by means of which we perform a simulation study for transitions to different economic regimes. Moreover, it is shown that the infinite-dimensional properties of the system, when appropriately transformed and rescaled, are those of a collection of interacting Fleming-Viot diffusions.Bayesian Nonparametrics; Gibbs sampler; interacting Polya urns; particle system; species sampling models; market dynamics; interacting Fleming-Viot processes
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