Telecommunications infrastructures and policies as factors in regional competitive advantage and disadvantage

There has been a revolution in telecommunications technologies in recent years. New technologies with myriad applications have helped transform markets, industrial structures and the organisation of firms throughout the economy. These changes have had important spatial effects which are the subject of this paper. The processes of adoption and diffusion of telecommunications technologies are discussed. The argument that the spread of such technologies means that"distance no longer matters" is scrutinised. There is a theme in the literature that this decentralising tendency has particular implications for peripheral regions, that new communications technologies could have a significant impact in reducing the traditional economic disadvantages of such regions. However, there is a contrary argument that there remain strong centralising tendencies. Indeed, new communications technologies may be associated with an increasing polarisation of economic activity. These theoretical arguments are revisited in the context of a case study of the Scottish Highlands and Islands. This is a particularly interesting region because, although it is a peripheral, rural area, it has a highly developed telecommunications infrastructure. This case study deploys the results of a recent study of the use by firms in the Highlands and Islands of communications technologies. The paper finds little significant evidence that telecommunications initiatives in the Scottish Highlands and Islands have significantly altered the competitive position of the region. The paper concludes with a discussion of some of the implications for national and local policy makers in encouraging the take up and effective use of new communications technologies.

Palaeoecological and possible evolutionary effects of early Namurian (Serpukhovian, Carboniferous) glacioeustatic cyclicity

Early Namurian (Serpukhovian, Carboniferous), sedimentary cycles in the Throckley and Rowlands Gill boreholes, near Newcastle upon Tyne, UK, consist of fossiliferous limestones overlain by (usually unfossiliferous) black mudstone, followed by sandstones and often by thin coal seams. Sedimentological and regional geological evidence suggests that the largest are high-amplitude cycles, probably of glacioeustatic origin. 13C (bulk organic matter) delineates marine and non-marine conditions because of the large difference between terrestrial and marine 13C, and indicates that full marine salinity was only intermittent and resulted from glacioeustatic marine transgression superimposed on a background of inundation by freshwater from large rivers, which killed off the marine biota. Palynology suggests that plant groups, including ferns and putative pteridosperms, were affected by changing sea level, and that there is a theoretical possibility of connection between cyclicity and the first appearance of walchiacean conifer-like monosaccate pollen such as Potonieisporites. Long-term terrestrial and marine increasing 13C (organic) may reflect the onset of major glaciation in Gondwana, as there is evidence to suggest that the two are coeval, but no specific mechanism can be suggested to link the trends

The remitting patterns of African migrants in the OECD

Recorded remittances to Africa have grown dramatically over the past decade. Yet data limitations still mean relatively little is known about which migrants remit, how much they remit, and how their remitting behavior varies with gender, education, income levels, and duration abroad. This paper constructs the most comprehensive remittance database on immigrants in the OECD currently available, containing microdata on more than 12,000 African immigrants. Using this microdata the authors establish several basic facts about the remitting patterns of Africans, and then explore how key characteristics of policy interest relate to remittance behavior. Africans are found to remit twice as much on average as migrants from other developing countries, and those from poorer African countries are more likely to remit than those from richer African countries. Male migrants remit more than female migrants, particularly among those with a spouse remaining in the home country; more-educated migrants remit more than less educated migrants; and although the amount remitted increases with income earned, the gradient is quite flat over a large range of income. Finally, there is little evidence that the amount remitted decays with time spent abroad, with reductions in the likelihood of remitting offset by increases in the amount remitted conditional on remitting.Population Policies,Remittances,Gender and Development,Debt Markets,International Migration

The Remitting Patterns of African Migrants in the OECD

Recorded remittances to Africa have grown dramatically over the past decade. Yet data limitations still mean relatively little is known about which migrants remit, how much they remit, and how their remitting behavior varies with gender, education, income levels, and duration abroad. We construct the most comprehensive remittance database on immigrants in the OECD currently available, containing microdata on over 12,000 African immigrants. Using this microdata we establish several basic facts about remitting patterns of Africans, and then explore how key characteristics of policy interest relate to remittance behavior. Africans are found to remit twice as much on average as migrants from other developing countries, while those from poorer African countries are more likely to remit than those from richer African countries. We find male migrants remit more than female migrants, particularly among those with a spouse remaining in the home country; that more educated migrants remit more than less educated migrants; and that while the amount remitted increases with income earned, the gradient is quite flat over a large range of income. Finally, we find little evidence that the amount remitted decays with time spent abroad, with reductions in the likelihood in remitting offset by increases in the amount remitted conditional on remitting.Remittances, Migration, Africa

Neural activity in the visual thalamus reflects perceptual suppression

To examine the role of the visual thalamus in perception, we recorded neural activity in the lateral geniculate nucleus (LGN) and pulvinar of 2 macaque monkeys during a visual illusion that induced the intermittent perceptual suppression of a bright luminance patch. Neural responses were sorted on the basis of the trial-to-trial visibility of the stimulus, as reported by the animals. We found that neurons in the dorsal and ventral pulvinar, but not the LGN, showed changes in spiking rate according to stimulus visibility. Passive viewing control sessions showed such modulation to be independent of the monkeys' active report. Perceptual suppression was also accompanied by a marked drop in low-frequency power (9–30 Hz) of the local field potential (LFP) throughout the visual thalamus, but this modulation was not observed during passive viewing. Our findings demonstrate that visual responses of pulvinar neurons reflect the perceptual awareness of a stimulus, while those of LGN neurons do not

Structural Analysis and Stochastic Modelling Suggest a Mechanism for Calmodulin Trapping by CaMKII

Activation of CaMKII by calmodulin and the subsequent maintenance of constitutive activity through autophosphorylation at threonine residue 286 (Thr286) are thought to play a major role in synaptic plasticity. One of the effects of autophosphorylation at Thr286 is to increase the apparent affinity of CaMKII for calmodulin, a phenomenon known as “calmodulin trapping”. It has previously been suggested that two binding sites for calmodulin exist on CaMKII, with high and low affinities, respectively. We built structural models of calmodulin bound to both of these sites. Molecular dynamics simulation showed that while binding of calmodulin to the supposed low-affinity binding site on CaMKII is compatible with closing (and hence, inactivation) of the kinase, and could even favour it, binding to the high-affinity site is not. Stochastic simulations of a biochemical model showed that the existence of two such binding sites, one of them accessible only in the active, open conformation, would be sufficient to explain calmodulin trapping by CaMKII. We can explain the effect of CaMKII autophosphorylation at Thr286 on calmodulin trapping: It stabilises the active state and therefore makes the high-affinity binding site accessible. Crucially, a model with only one binding site where calmodulin binding and CaMKII inactivation are strictly mutually exclusive cannot reproduce calmodulin trapping. One of the predictions of our study is that calmodulin binding in itself is not sufficient for CaMKII activation, although high-affinity binding of calmodulin is

Settlement Patterns and the Geographic Mobility of Recent Migrants to New Zealand

Twenty-three percent of New Zealand's population is foreign-born and forty percent of migrants have arrived in the past ten years. Newly arriving migrants tend to settle in spatially concentrated areas and this is especially true in New Zealand. This paper uses census data to examine the characteristics of local areas that attract new migrants and gauges the extent to which migrants are choosing to settle where there are the best labour market opportunities as opposed to where there are already established migrant networks. We estimate McFadden's choice models to examine both the initial location choice made by new migrants and the internal mobility of this cohort of migrants five years later. This allows us to examine whether the factors that affect settlement decision change as migrants spend more time in New Zealand.Immigration, Settlement, Mobility, New Zealand

Defining Areas: Linking Geographic Data in New Zealand

This paper develops a match quality statistic to quantify the trade-off between 'specificity' and 'completeness' when aggregating one regional aggregation to another. We apply this statistic to calculate the degree of mismatch between various regional aggregations for New Zealand using 1991 and 2001 Census Data. A program to calculate mismatch statistics is included as an appendix, as a Stata(r) ado file.Match quality; Geographic Aggregation