BACKGROUND We assessed aspects of Seguro Popular, a programme aimed to deliver health insurance, regular and preventive medical care, medicines, and health facilities to 50 million uninsured Mexicans. METHODS We randomly assigned treatment within 74 matched pairs of health clusters-ie, health facility catchment areas-representing 118 569 households in seven Mexican states, and measured outcom...

research on popular music in iran has a short history. perhaps the article “sociology of the music of the masses in iran”, published in 1980, can be considered as the first methodological and systematic study on the popular music in iran.  in that article, the researcher, using marxist and neo-marxist approaches to study popular music, provides a general view on the music of the masses of the p...

There has been extensive work on the existence of periodic solutions for nonlinear second order autonomous differantial equations, but little work regarding the third order problems. The popular Poincare-Bendixon theorem applies well to the former but not the latter (see [2] and [3]). We give a necessary condition for the existence of periodic solutions for the third order autonomous system...

The Springer-Praxis Popular Astronomy programme covers the latest observations, techniques and discoveries in astronomy, astrophysics and cosmology, selecting key topics designed to fire the imagination of keen astronomers everywhere. Many of the topics selected for titles in this programme are refreshingly new, and away from the accepted mainstream of titles published in this area. Topics inc...

How do you aggregate the preferences of multiple agents in a fair manner? This is a question that has occupied researchers for several centuries. Suppose we have k voters who each give their preferences on n candidates. How should the candidates be ranked to best represent the input? Marquis de Condorcet [5] showed that there may not exist a “winner”: a candidate who beats all other candidates ...

The Springer-Praxis Popular Astronomy programme covers the latest observations, techniques and discoveries in astronomy, astrophysics and cosmology, selecting key topics designed to fire the imagination of keen astronomers everywhere. Many of the topics selected for titles in this programme are refreshingly new, and away from the accepted mainstream of titles published in this area. Topics inc...

that the dynamic psychology of human behaviour has a part to play in the interpretation and understanding of that behaviour, and an important function in solving its inter-personal inter-national and social aberrations, then we must take note of this growing demand for "popular" knowledge. We must be prepared to put over our knowledge in a way that is helpful and understanding, yet stimulating ...