vulnerability and contamination risk assessment is of great importance in karst aquifer management. because of vastness of karst in zagros, natural conditions and human activity within the region of aquifer, pollution emission has become one of the most important challenges in front of zagros aquifers. the purpose of this study is to assess marab aquifer vulnerability, using riske model and, de...

• Autocorrelation Function (ACF): Autocorrelation is a statistical measure of the relationship, if any, between a random variable and itself, at different time lags. The autocorrelation coefficient can range between +1 (very high positive correlation) and -1 (very high negative correlation). The Autocorrelation function (ACF) shows the value of the autocorrelation coefficient for different time...

Abstract: Today's society is characterized by consumers becoming more educated and demanding for products and services they use. Wherever, organizations are structured to respond the explicit or implicit needs of consumers, which lead to increased competitiveness of organizations. This competitiveness is reflected in the ongoing quest to provide high quality products and excellence process deve...

Abstract. In fully developed turbulence, the velocity field possesses long-range correlations, 10 denoted by a scaling power spectrum or structure functions. Here we consider the autocorrelation 11 function of velocity increment Δu`(t) at separation distance time `. Anselmet et al. [Anselmet 12 et al. J. Fluid Mech. 140, 63 (1984)] have found that the autocorrelation function of velocity 13 inc...

In some statistical process control applications, a relationship between a response variable and an explanatory variable referred to as profile characterize the quality of a process or product and should be monitored over time. Many researches have been done in this area but in most of them, the successive observations in different levels of the explanatory variables are assumed to be independe...

In ecological field surveys, observations are gathered at different spatial locations. The purpose may be to relate biological response variables (e.g., species abundances) to explanatory environmental variables (e.g., soil characteristics). In the absence of prior knowledge, ecologists have been taught to rely on systematic or random sampling designs. If there is prior knowledge about the spat...

Glossary AutoA prefix literally meaning self; spatial autocorrelation means self-correlation, or values within a given variable are correlated, resulting in the variable being correlated with itself. Correlation A description of the nature and degree of a relationship between a pair of quantitative variables. Geary Ratio An index of spatial autocorrelation, involving the computation of squared ...

trend analysis of changing stream flow of spring in khoramabad city in three times span namely month, season and annual were investigated by statistical method. the data used include data from 4spring were selected in 40-years period (1348-1388). in this study, the slope of the linear trend in the data sample estimates with using the tsa and then with using tfpwmethodthe effect of coefficient o...