Transport investments can induce positive productivity benefits via agglomeration economies by increasing the scale and efficiency of spatial economic interactions. In assessing the ‘agglomeration benefits’ of transport investments we need to understand the spatial scale over which these externalities are distributed. This report is concerned with the effect of urban agglomeration on productivi...

Many industries are geographically concentrated. Many mechanisms that could account for such agglomeration have been proposed. We note that these theories make different predictions about which pairs of industries should be coagglomerated. We discuss the measurement of coagglomeration and use data from the Census Bureau’s Longitudinal Research Database from 1972 to 1997 to compute pairwise coag...

Objective(s):This study dealt with the wet agglomeration process in which a small quantity of binder liquid was added into a suspension of crystals, directly in the stirring vessel where the crystallization took place. The purpose of this investigation was evaluation of the effect of temperature on the agglomeration process in order to gain insight into the mechanism of the formation of the agg...

We investigate the formation of GMCs in spiral galaxies through both agglomeration of clouds in the spiral arms, and self gravity. The simulations presented include twofluid models, which contain both cold and warm gas, although there is no heating or cooling between them. We find agglomeration is predominant when both the warm and cold components of the ISM are effectively stable to gravitatio...

Gold nanoparticles with a graft density of 0.09, 0.30 and 0.40chains/nm2 of poly(N-isopropylacrylamide) were reproducibly synthesized by varying the ratio of disulfide terminated poly(N-isopropylacrylamide) to gold nanoparticle. The polymer coated nanoparticles were stable at room temperature in 50mM NaCl, yet agglomerated at 37°C. Previous studies have observed conflicting results as to the re...

The degree of geographic concentration of individual manufacturing industries in the U.S. has declined only slightly in the last twenty years. At the same time, new plant births, plant expansions, contractions and closures have have shifted large quantities of employment across plants, firms, and locations. This paper uses data from the Census Bureau’s Longitudinal Research Database to examine ...

A model to simulate the time evolution of the distribution of agglomeration degree of sucrose crystals is deduced and validated against experimental data obtained through an image analysis technique. The crystallisation laboratory facility, procedures and the resulting experimental data are described. The model employed includes nucleation, growth, growth rate dispersion and agglomeration kinet...

Most models of regional agglomeration are based on the NEG (New Economic Geography) model in which returns to scale are pecuniary. We investigate the implications for regional agglomeration of a "Marshallian" model in which returns to scale derive from technological externalities. Workers are assumed to have heterogeneous "home region" preferences. The model is designed to explain how "second n...

Retailers often co-locate spatially to draw consumers, even though it increases price competition. The paper develops a structural model of entry and location choice that isolates the agglomeration benefit of co-location, after controlling for pure differentiation rationales for colocation such as (1) high demand and/or low cost at the location; (2) zoning restrictions and (3) format differenti...