The dominance of Jamaican sprinters in international meets remains largely unexplained. Proposed explanations include demographics and favorable physiological characteristics. The aim of this study was to analyze the demographic characteristics of world class Jamaican sprinters. Questionnaires administered to 120 members of the Jamaican national team and 125 controls elicited information on pla...

paleolithic lithic assemblages are traditionally described on the bases of presence of a variety of tool types(typology) and of different knapping technologies. in this study we tried to investigate whether the presence ofdifferent groups of scrapers in the mar-tarik site assigned to the middle paleolithic represent specific function orjust different stages of the reduction process and constant...

OBJECTIVE Documentation of the management of mass casualties in Tahrir Square. BACKGROUND We documented the sequences of our medical response to mass casualties in Tahrir Square between January 28, 2011, and February 4, 2011, at "Kasr El-Ainy" Cairo University Hospital, the largest hospital in the Middle East and the tertiary referral center for all hospitals in Egypt that happened to be the ...

The concept of environmental sustainability aims to achieve economic development while achieving a sustainable environment. inverted U-shape relationship between growth and quality, also called Environmental Kuznets Curve (EKC), describes the correlation carbon emissions. This study assesses role agriculture energy-related variables evaluating EKC threshold in 54 African economies, income group...

introduction evaporation is a phenomenon of hidrological cycle that is particularly important in studies of water. much of the annual rainfall in arid and semi-arid weather characteristics that iran immediately returns to the atmosphere. so it will be important to estimate and predict the amount of evaporated to estimate of water. dez basin in south-west iran, where the country's main cent...