754 research outputs found

    Internal Migration and Regional Population Dynamics in Europe: Czech Case Study

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    Report prepared for the Council of Europe (Directorate of Social and Economic Affairs, Population and Migration Division) and for European Commission (Directorate General V, Employment, Industrial Relations and Social Affairs, Unit E1, Analysis and Research on the Social Situation) Czech Republic has experienced, over the last decade, quite a balanced population system with low growth. This has changed recently and from 1994 we noted a decrease in population partially offset by international migration, for the time being mainly temporary labour circular movements. The decreasing trend may well continue due to future replacement in the reproductive ages of large female cohorts with much smaller cohorts, currently aged 0-15 years. Ales and Simek (1996) expect by the year 2020 a population decrease of at least 471 thousand (high variant). International migration will probably reduce to some extent the effect of negative natural increase. In terms of population dynamics the most important feature we have observed is slow but clear deconcentration of population from large cities to suburban areas. The main gains are observed in medium size towns and smaller communities at the expense of large cities and rural areas. However, the migration factor plays a lesser role than in the past. Net migration is low and migration effectiveness is very limited. The relationship between migration and other variables (population density, level of urbanisation) is rather weak. Unemployment has limited negative impacts on migration flows. No doubt, this may change when the serious restructuring of industry starts and unemployment increases - an almost certain scenario given the Czech Republic's willingness to join the European Union. The main enigma of the Czech migration system is its future dynamics. So far migration has been low, but with the development of the economy, including the housing market, improvement of telecommunication and increasing wealth of the society one may expect that migration trends would contribute much more to the regional population dynamics. The large units for which migration data were available in the Czech Republic reduce the number of inter-unit migrations, increase the number of intra-unit migrations, and in effect blur the picture of mobility, which anyway is quite low. Another factor, which made the analysis somewhat difficult is the mixture of signals sent to the economy by the Czech government. This mixture has confused professional economists, not to speak of ordinary people

    How to find MACHOs in the Virgo Cluster

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    We discuss the feasibility of finding extra-galactic MACHOs by monitoring quasars behind the Virgo cluster of galaxies. We show that with only a modest observing programme one could detect several MACHOs in the mass range 1 X 10^{-5} to 2 X 10^{-2} solar masses if they make a significant contribution to the mass of Virgo. The contamination by events from cosmologically distributed MACHOs is estimated and is negligible if either the MACHO mass is greater than about 10^{-4} solar masses or the quasar radius is greater than about 3 X 10^{15} cm.Comment: 5 pages, 1 figure, to appear in New Astronom

    Pre-exposure prophylaxis (PrEP) in an era of stalled HIV prevention: Can it change the game?

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    Pre-exposure prophylaxis (PrEP) for HIV prevention has evolved significantly over the years where clinical trials have now demonstrated the efficacy of oral PrEP, and the field is scaling-up implementation. The WHO and UNAIDS have made PrEP implementation a priority for populations at highest risk, and several countries have developed guidelines and national plans accordingly, largely based on evidence generated by demonstration projects. PrEP presents the opportunity to change the face of HIV prevention by offering a new option for protection against HIV and disrupting current HIV prevention systems. Nevertheless, as with all new technologies, both practical and social requirements for implementation must be taken into account if there is to be sustained and widespread adoption, which will also apply to forthcoming prevention technologies. Defining and building success for PrEP within the scope of scale-up requires careful consideration. This review summarises where the PrEP field is today, lessons learned from the past, the philosophy and practicalities of how successful programming may be defined, and provides perspectives of costs and affordability. We argue that a successful PrEP programme is about effective intervention integration and ultimately keeping people HIV negative

    Challenges in addressing inequity in access to COVID-19 diagnostics, therapeutics and vaccines in Africa.

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    Significance:Although the global response to COVID-19 has demonstrated that some progress has been made in ensuring timely access to new medical interventions in Africa, much more needs to be done to strengthen the global systems that enable equitable access to health technologies during public health emergencies
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