java is an object-oriented program that has abundant open-source libraries for application development and 3d model rendering. spatial database is the database that can efficiently store and manage geographic information data though various spatial data management techniques. this paper explores the rationale of coupling java with spatial database to develop an effective platform for future bui...

In markets where spatial competition is important, many models predict that average prices are lower in denser markets (i.e., those with more producers per unit area). Homogeneous-producer models attribute this effect solely to lower optimal markups. However, when producers instead differ in their production costs, a second mechanism also acts to lower equilibrium prices: competition-driven sel...

Abstract The nonlocal competition in prey and schooling behavior among predators are incorporated a delayed diffusive predator–prey model. Our main interest is to study the dynamic properties of model generated by delay. We mainly concentrate on stability Hopf bifurcation at coexisting equilibrium. Compared with without competition, our results suggest that can affect equilibrium, induce stably...

This paper analyses the evolution of electricity prices in deregulated market. I formulate a model that takes into account the spatial features of a network of a market. The model is applied to equilibrium electricity spot prices of the PJM market. An empirical analysis indicates that the problem of unobserved spatial correlation in the network can be modeled by the Spatial Error Model providin...

The second of this series of two papers is devoted to a theoretical analysis of spatial interaction between commodity markets. The theoretical framework that we present is referred to as the stochastic spatial arbitrage model (SSAM); it accounts for most of the empirical regularities observed in the first paper. Two basic mechanisms are found to be responsible for spatial inter-market interacti...

Researchers embracing agent-based microsimulation models often criticize the inability of urban equilibrium models to reflect spatial heterogeneity and transitional dynamics. These limitations are major barriers for land use and transportation planners who may wish to apply urban economic models in regular planning processes. To this end, this paper extends Anas’ spatial computable general equi...

ABSTRACT- The information on the spatial properties of soil is vital to improve soil management and to increase the crop productivity. Geostatistical analysis technique is one of the most important methods for determining the spatial properties of soil. The aim of this study was to investigate spatial variability of soil chemical and physical attributes for field management in eastern Shiraz, I...

A one-dimensional spatial model of electoral competition with regional parties is considered, where parties only want to win constituencies. With no regional parties and only two national parties, the median voter theorem holds. But when we consider one national party and one regional party for each of the two regions, then the median voter theorem breaks down. Equilibrium is characterized unde...