In this article, we introduce a novel geometrical index δagg, which is associated with the Euler number and is obtained by an image processing procedure for a given digital picture of aggregated particles such that δagg exhibits the degree of the agglomerations of the particles. In the previous work (Matsutani, Shimosako, Wang, Appl. Math. Modeling 37 (2013), 4007–4022), we proposed an algorith...

This paper studies how firm heterogeneity in terms of productivity affects the balance between agglomeration and dispersion forces in the presence of pecuniary externalities through a selection model of monopolistic competition with variable mark-ups. It shows that firm heterogeneity matters. However, whether it shifts the balance from agglomeration to dispersion or the other way round depends ...

Firms and workers are much more productive in large and dense urban environments. There is substantial evidence of such agglomeration economies based on three aproaches. First, on a clustering of production beyond what can be explained by chance or comparative advantage. Second, on spatial patterns in wages and rents. Third, on systematic variations in productivity with the urban environment. H...

The article presents the essential issues and algorithm of the methodology of a four-step transportation model, which was constructed in order to carrying out a household interview survey. The results of this research are source data for determining the travel behaviour of the users of transportation systems, including intelligent transport systems (ITS). The presented issues regarding the surv...

This paper outlines a dynamic model of firm location choice, in an environment which includes both agglomeration effects and stochastic productivity shocks. The model follows closely the methods of Hopenhayn (1992) and his treatment of firm level entry and exit decisions. However, this model adds the complexity of a second location, as well as the existence of spillover effects, or agglomeratio...

Agglomeration Economies, or production cost savings due to geographic clustering of firms and industries, can enhance the growth and development of firms, industries, regions and cities. We provide an overview of the theory and empirical literature of agglomeration, and highlight several applications from the cost function perspective. These applications include cost savings from density in the...

SUMMARY To solve a given ne mesh problem, the design of a multigrid method requires the deenition of coarse levels, associated coarse grid operators and inter-grid transfer operators. For non-structured simplicial meshes, these deenitions can rely on the use of non-nested triangulations. Another possibility is to found these deenitions on agglomeration/aggregation techniques in a purely algebra...

The observation of an unusual light-induced agglomeration phenomenon that occurs besides the trapping of the gold nanoparticles aggregates (GNAs) has been observed. The observed agglomerate has a 60-100 μm donut-shaped metal microstructure with the rate of formation dependent on the laser power used. In this paper, the forces involved and the mechanism of this further agglomeration phenomenon a...

PN187MvGnew Abstract The present study addresses the relevance of geographic proximity for companies in our age of advanced ICT. Many visions of, and speculations on, an increased footlooseness of companies and a concomitant dispersal of urban economic activity have been published in recent years. To identify whether urban agglomeration economies (in particular, knowledge spillovers) are still ...

Fluidized bed agglomeration is used to produce large and porous dry agglomerates with improved instant properties. Water (or binder solution) is sprayed in the fluidized bed of particles to render their surface sticky. The agglomerate growth results from the repetition of different steps (wetting of the particle surface, particles collision and bridging, and drying) and depends on the processin...