The relationship between satellites observed aerosol optical depth to PM2.5 at surface is important to monitor and quantify the air pollution at ground from satellite observations which is relatively more independent and has less artificial errors than groundbased measurements. However, the physical connection between AOD and PM2.5 is relatively indirect and weak thus can be affected by multipl...

In this paper a novel approach, based on a neural network structure, is introduced in order to face with the problem of pollutant estimation in an urban area. A neural architecture, based essentially on suitable number of layers devoted to predict alarm situations and to estimate the value of the pollutant, has been implemented. A new method for short term prediction is presented using the neur...

from the mathematical point of view, the fao penman-monteith equation shows a homographic function related to the wind speed. the homographic function has horizontal and vertical asymptotes. in this issue horizontal asymptote is applicable; because the vertical asymptote occurs for negative values of wind speed but the negative sign indicates the direction of the wind speed and only the absolut...

This study represents part of a project by the Global Change and Terrestrial Ecosystem Soil Erosion Network to validate wind erosion models. Soil loss measurements from 46 storm events from eroding fields in six states were compared to predictions from the Wind Erosion Prediction System (WEPS) erosion submodel. The field data were collected from small (2.5 ha), circular, cropland fields with no...

In the present study, outdoor airborne microflora (bacteria) at different locations, viz Health care center, Commercial Complex, Traffic Junction, Industrial Unit, Sewage treatment plant and Agricultural area of Neyveli, southern peninsular of India was investigated on 5 , 7 April, 2008. It was observed that the Concentrations of airborne viable bacteria averaged between 229+1.58CFU/m at Mandha...

The need for a fire-induced flashover probability index (FIFPI) for Eskom’s transmission lines (South Africa) became evident soon after the installation the Advanced Fire Information System (AFIS) in 2004. Thousands of wildfires were detected by satellites close to transmission lines, but only a small percentage (4%) of these fires caused a flashover. Historical flashover data was compared to s...

Climatic variables collected from weather stations evenly distributed in all regions of Turkey were used to study the potential Gaussian Process Regression (GPR) and Support Vector (SVR) predicting reference evapotranspiration (ET0). The as input features for GPR SVR models solar radiation, mean temperature, wind speed, relative humidity, month year. corresponding ET0 values calculated using Fo...

introduction more and better production of food is one of the necessities of today's world. since production of agricultural products of one region depends on the air and climatic factors, it is important to examine the role of climate in agriculture (mohammadi et al., 2004: 123). in relation to agroclimatology, numerous studies by different scientists and agricultural climatologists have ...