Demographic estimation in countries with well-developed data reporting systems is based on data collected by censuses and vital registration systems. In countries with inadequate or inaccurate data reporting systems, demographic estimation often must rely on methods that are “indirect”. Such methods have been applied with considerable success in studies of mortality and fertility, but they have...

The Moon is generally thought to be geologically inactive, except for being pummeled by meteoroids of various sizes. The youngest returned igneous rocks are about 3 billion years old, although crater counting suggest some lava flows as young as a billion years. However, Peter Schultz (Brown University), Matthew Staid (Planetary Sciences Institute, Tucson), and Carlé Pieters (Brown University) r...

The article considers the issue of velocity distribution in a turbulent flow. logarithmic profile obtained on basis semiempirical theory turbulence by L. Prandtl is given. A comparison calculations for various dependencies with measurement data performed. It shown that calculated show discrepancy each other and experimental data. study hydraulic characteristics water flows required to solve pro...