over the past three decades helicopter-borne electromagnetic (hem) measurements have been used to reveal the resistivity distribution of the earth's subsurface for a variety of applications. hem systems include a “bird” or sensor containing one or more pairs of transmitting and receiving coils. the separation between the rigidly mounted transmitting and receiving coils of a coil-pair typic...

The classic overall profit needs precise information of inputs, outputs, inputs and outputs price vectors. In real word, all data are not certain. Therefore, in this case, stochastic and fuzzy methods use for measuring overall profit efficiency. These methods require more information about the data such as probability distribution function or data membership function, which in some cases may no...

In this paper a two impinging streams cyclone contacting system suitable for handling of solid-liquid systems has been studied. Certain pertinent parameters such as: solid holdup, mean residence time and Residence Time Distribution (RTD) of solid particles have been investigated. A stochastic model based on Markov chains processes has been applied which describe the behavior of solid partic...

omplex mixtures of disinfection by-products are formed in drinking waters when chlorine is used as disinfectant, among which are found trihalomethanes. trihalomethanes are very stable in the natural environment and are moderately lipophilic. thus they accumulate in the human organism, which may be related to a greater risk of certain cancers.the objective of this study is to investigate the ass...

The radio sky at lower frequencies, particularly below 20 MHz, is expected to be a combination of increasingly bright non-thermal emission and significant absorption from intervening thermal plasma. maps these frequencies cannot therefore obtained by simple extrapolation those higher frequencies. However, due severe constraints in ground-based observations, this spectral window still remains gr...