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At least 1,135 records · Page 63Linked to original sources
PubMed2000

Optimal stopover decisions under wind influence: the effects of correlated winds.

Wind speed and direction have a significant effect on a flying bird's ground speed. Migrants are therefore expected to be sensitive to wind conditions and this should have consequences for optimal strategies of stopover and refuelling. Based on an earlier model of time-minimizing migration which includes wind condition, we investigate the consequences of the temporal correlation of wind conditions. Day-to-day changes in wind conditions are modelled with a two-state Markov process and an expression for the expected speed of migration is derived. The policy of the migrants is described by two parameters: a day t(g) when the birds start to leave whenever favourable conditions occur and a later day t(b)when they leave even in unfavourable winds. The model predicts that in most cases departures should be close to the date which is predicted by a wind-free deterministic model and that the birds should never leave without wind assistance. Only if the probability that the condition remains the same on the following day is close to 1 should the birds leave even in unfavourable conditions shortly after the deterministic optimal date. If the transition matrix is highly asymmetrical, i.e. if it is very probable that unfavourable conditions remain and that favourable conditions will change into unfavourable, then the birds are predicted to start using good winds several days before the deterministic optimal date. An analysis of six years of wind data from two sites in Sweden shows that wind directions on successive days are in fact correlated in all years.

Animals↗
PubMedDate not supplied

Identifying the determinants of tuberculosis control in resource-poor countries: insights from a qualitative study in The Gambia.

Despite the availability of effective treatment, tuberculosis (TB) remains a major cause of death from an infectious disease in the world, particularly in resource-poor countries. Among the chief reasons for this are deficiencies in case tracing and in adherence to treatment. In order to investigate the contribution of non-biological factors to these deficiencies, we carried out a qualitative study in The Gambia, West Africa, from October 2000 to March 2001. The methods used were focus group discussions, interviews, participant and non-participant observation, and case histories. Four domains were distinctively investigated: the TB patients, the community, the health care providers (including programme staff), and the donors and policy makers. Analysis of the data from all these sources indicated the contribution of a wide range of socio-anthropological factors which influence the success or otherwise of the TB control programme in The Gambia, i.e. gender, urban/rural residence, recourse to traditional healers, adherence to national health policies, knowledge about TB, migration, and socio-economic factors. It is concluded that all these factors must be taken into account in formulating interventions to improve detection of TB cases and patient adherence to treatment within the framework of the national TB control programmes, and proposals have been made for targeted interventions.

Allied Health Personnel↗
PubMed2003

Economic consequences of retiree concentrations: a review of North American studies.

PURPOSE: The study of patterns of residential mobility among individuals around the age of retirement has led to the recognition that for many reasons-climate and cost of living being the most frequently cited-settlement patterns of comparatively affluent retirees will often differ from those of the working-age population. Increasingly, localities may often seek this type of relocation, on the theory that the newcomers will provide a boost to the local economy through expenditures and tax payments. In addition, there is often the perception that such a strategy will not cost the community much in the way of locally provided public services. The past several years have witnessed a substantial increase in efforts to provide some quantitative estimates on the magnitude of these hypothetical effects. DESIGN AND METHODS: This article aims at providing a summary assessment of such analyses, incorporating research projects in both the United States and Canada. RESULTS: Practically all such studies may be characterized as being exclusively short term in nature; that is, they focus more or less exclusively on the near-term implications of retiree inmigration, which do tend to be overwhelmingly positive from an economic or fiscal perspective. IMPLICATIONS: In general, this area of inquiry may be characterized by a paucity of knowledge regarding the longer term effects of such population movement. There has been no effort to analyze the aging in place of the erstwhile newcomers or the failure of the retirement migration process to generate other than a plethora of opportunities for comparatively low-skill, low-wage service employment. Policies intended to foster amenity migration as an economic development tool would greatly benefit from longer term analyses of the economic implications of the process.

Aged↗
PubMed1993

[The influence of politically determined wage rates on migration between Germany's new and old states].

"This paper investigates the influence of politically determined wage rates on migration between Germany's new and old states. Apart from their direct influence on expected income and hence on migration, nominal wages affect migration indirectly by the unemployment they generate. Under reasonable assumptions the relation between nominal wages and migration is negative. The long-run influence of wages on capital accumulation and hence employment opportunities emphasizes that wage policy can be used either to control the long-run population stock or to stop migration immediately. That latter requires instantaneous wage-rate adjustments and initial wage-rate undershooting." (SUMMARY IN ENG)

Demography↗
PubMed1993

[Employment of cross-border workers in the Federal Republic of Germany].

The author analyzes the cross-border movement of labor migrants in Germany. The impact of increased integration among European Community countries is considered, and the pressure of migration from neighboring Eastern European countries is discussed. "Employment of workers from border regions [provides the] possibility of meeting the labour demand in the region, of alleviating the pressure to migrate by legalizing inflows and of balancing the interests of employers and cross-border workers, thus avoiding some of the negative side-effects or social costs of traditional labour migration." (SUMMARY IN ENG AND FRE AND RUS)

Demography↗
PubMed1994

International migration and development.

"This article assesses the effects of migration on development, emphasizing the shift from a national to an international perspective. The issue of migration, trade and international cooperation is considered next. The last section of the article is devoted to policy with reference to development cooperation as an alternative to migration."

Commerce↗