introduction hymenocrater from lamiaceae family is a perennial bush with 24 species in the world and 10 different species in natural habitats of iran (satil et al., 2007). hymenocrater platystegius rech. is exclusive to khorasan province in the north east of iran (mozaffarian, 1996). according to available information, %5 of plant species of iran are becoming extinct, which is 550 times higher ...

The EGS4 (Electron Gamma Shower, Version 4) Monte Carlo simulation code is used to calculate the conversion factors of the radon daughter quantity accumulated on the ground surface to the environmental gamma radiation dose rate with considering the actual geographical conditions. When the precipitation rate is low, the time variation of the environmental gamma radiation dose rate estimated from...

[1] World Meteorological Organization (WMO) regression models for precipitation gauge bias developed by Goodison et al. (1998) were optimized using the very fast simulated annealing algorithm. The regression model uncertainties were estimated by use of a Bayesian stochastic inversion (BSI) algorithm. Legates and Willmott’s (1990) precipitation correction factors database (applicable to average ...

This study was aimed at modelling seasonal variation of stem circumference increments in a mixed stand composed of Norway spruce (Picea abies [L.] Karst.) and European beech (Fagus sylvatica L.). Moreover, we focused on the quantification of the main climatic factors governing the increments. The measurements were performed at a site established at about 970 m a.s.l. from the locality of Vrchsl...

West Nile virus (WNV) is the most widely distributed arbovirus in the world and the spread is influenced by complex factors including weather conditions and urban environmental settings like storm water management ponds (SWMP). The purpose of this work was to develop an ordinary differential equation model to explore the impacts of SWMP, temperature and precipitation on WNV vector abundance and...

Nowadays the preservation of the planet is spreading into the international scene with the use of renewable energy sources such as bioethanol. The challenge is to guarantee the quality of produced bioethanol, and the electrolytic conductivity (EC) is one of the specified parameters for this purpose. However, is necessary to demonstrate the metrological traceability of the measurement results fo...

the analysis of the relationship between spatial distribution of environmental factors andvegetation types is crucial for understanding mountainous ecosystems. in this research agis based approach was used to produce a vegetation map for sabzkouh protected area inthe chaharmahal-va-bakhtiari province. to identify environmental parameters affecting thevegetation cover, 6 primary and secondary en...