background: the phenomenon of dust is a serious environmental problem in dry and semi dry regions. it has a destructive effect for the residents of such regions. over two-thirds of iran is in areas of dry and semi-dry climate conditions. methods: in this research, dust fall measurements were taken in 41 stations across yazd city using a marble dust collector (mdco) located in different parts of...

We investigate decaying D-branes as the origin of the thermal string gas of string gas cosmology. We consider initial configurations of low-dimensional branes and argue that they can time evolve to thermal string gas. We find that there is a range in the weak string coupling and fast brane decay time regimes, where the initial configuration could drive the evolution of the dilaton to values, wh...

this study setout to investigate the effect of wheat residue, tillage, and nitrogen fertilizer management on some agronomic traits of soybean as a split split plot based on randomized complete block design with three replications. the main plots included wheat residue management: collecting and leaving residue and sub plot included tillage (without tillage and conventional tillage), and the sub...

We use a model of domestic and international tourist numbers and flows to estimate the impact of the recent and proposed changes in the Air Passenger Duty (APD) of the United Kingdom. We look at four different scenarios (abolishing the APD, keeping the 2001 APD level, the 2007 APD and the Conservative Party’s ‘‘Green Miles’’ proposal) using base, high and very high elasticity levels as well as ...

As the era of 5th Generation (5G) networks is dawning, several pertinent issues associated with improvements that have to be achieved in future communications are attracting increasing research attention. This work, considered achieving energy efficiency for 5G at base stations level. Energy simply means using less perform same task thereby, eliminating waste. The objective this paper examine w...

This paper studied pitch contours of a Taiwanese-acquiring infant at gooing stage. Breath group theory has shown that pitch patterns of this stage were physiologically-based [6]. Fall was expected to occur at the boundary of a breath group. It predicted that Fall to be the most common pitch contour, and the second high was Rise-Fall. But previous studies [8], [9] showed that Rise-Fall occurred ...

Consider a globally hyperbolic cosmological spacetime. Topologically, the spacetime is then a compact 3-manifold in cartesian product with an interval. Assuming that there is an expanding direction, is there any relation between the topology of the 3-manifold and the asymptotics? In fact, there is a result by Michael Anderson, where he obtains relations between the long-time evolution in Genera...