Background: Iran is located in the global arid zone. With an average rainfall of less than 250 mm. 25 percent is Iran of located in hyper-dry area and 40 percent in the arid area. In 2007, the World Bank report declared the annual reduction of freshwater resources in Iran 6 times more than global standards and indicators. Since at present, in Iran most available fresh water enters the water eco...

The multiplicative coalescent X(t) is a l-valued Markov process representing coalescence of clusters of mass, where each pair of clusters merges at rate proportional to product of masses. From random graph asymptotics it is known (Aldous (1997)) that there exists a standard version of this process starting with infinitesimally small clusters at time −∞. In this paper, stochastic calculus techni...

OVER three-hundred and thirty years ago, just when England was about to be rent apart by the Civil War, Thomas Browne, a student of Padua and Montpellier and a Doctor of Medicine of both Leiden and Oxford, wrote Religio Medici. This contributed little to religion, but in the stately prose of a bygone age ranged far and wide with protestations of piety and a gentle irony. One of the best known p...

Many Atlantic salmon, Salmo salar, populations are decreasing throughout the species' distributional range probably due to several factors acting in concert. A number of studies have documented the influence of freshwater and ocean conditions, climate variability and human impacts resulting from impoundment and aquaculture. However, most previous research has focused on analyzing single or only...

Dams are important reservoirs in semiarid regions providing the needs of population and agricultural activities an area which intermittent rivers predominate. These subject to erosion processes that can cause sedimentation affect quality water them. The method dating sediments using 210Pb is well known used establish a precise chronology places where abrupt changes conditions do not occur. work...

Glaridacris hexacotyle (Linton, 1897) is known only from the superficial description of Linton (1897) and the more detailed account of Hunter (1930); both descriptions were based on the same eight specimens from "Catostomus sp." from the Gila and Salt Rivers in Arizona. This paper presents additional descriptive data and proposes nomenclatorial changes based upon a restudy of the original mater...

Herries provides a timely review of the archaeological and dating evidence of the transition from the Acheulean to the Middle Stone Age (MSA) in southern Africa, however, in relation to the site of Twin Rivers, Zambia he makes several fundamental errors of interpretation that demand correction. The stratigraphic sequence of the site is admittedly complex, but it deserves a more careful analysis...