Devonian-Carboniferous boundary is not clear in the Eastern Alborz Mountains. In the current study Tuyeh-Darvar section with about 170 m, thickness is selected. In this investigation, the primary goal is revision of Devonian/Carboniferous Boundary (known as DCB) and the other goal is the redefinition of the DCB as a famous necessity (based on ICS program in 2008 for defining the boundary and to...

The invertebrates are one of the most important terrestrial fauna and freshwater taxa.Benthic macroinvertebrates include aquatic insects and spiders, mites, crustaceans, andspecies of mollusks and worms that are aquatic in their immature stages and terrestrial intheir adult stage. Jajrud River originates from the Alborz Mountains and is a source of<br ...

water changes information in the hydrological system, in time and space, as an environmental issue takes heed of managers and decision makers in watershed management and river engineering, which can be addressed by using spatially distributed modeling. in this study simulation of water balance components in taleghan mountainous watershed is performed using the spatially distributed hydrological...

In this paper, the peak ground acceleration (PGA) over the bedrock is calculated by a probabilistic and deterministic seismic hazard assessment. An active fault map of the region is prepared. For this purpose, all active faults in a radius of 100 km from Amol city center are recognized and their seismic and rapture parameters are determined. Afterwards, for seismic hazard analysis, the seismic ...

This paper gives a brief description about some routing protocols like EEE LEACH, LEACH and Direct Transmission protocol (DTx) in Wireless Sensor Network (WSN) and a comparison study of these protocols based on some performance matrices. Addition to this an attempt is done to calculate their transmission time and throughput. To calculate these, MATLAB environment is used. Finally, on the basis ...

Variation in the body size of wild Culiseta morsitans collected from Massachusetts was examined. No significant size variation was detected at any time during the collection period, nor was there a significant size difference between parous and nulliparous mosquitoes. We conclude that size variation in this species does not affect survivorship, an important aspect of vectorial capacity.

Localitatea este comportamentul (auto-organizare structurala) a unei colectivităţi in jurul unei origini. Localitatea de grup este comportamentul unei colectivităţi determinat de anumite proprietăţi de grup, de exemplu simetriile unor figuri plane finite. Localitatea de grup este un alt punct de vedere asupra localităţii. Exprimând interconectarea ca model de colectivitate, demonstrăm că dihoto...