introduction 3d reconstruction of an object from its 2d cross-sections (slices) has many applications in different fields of sciences such as medical physics and biomedical engineering. in order to perform 3d reconstruction, at first, desired boundaries at each slice are detected and then using a correspondence between points of successive slices surface of desired object is reconstructed. mate...

We show that a hadron gas model with continuous particle emission instead of freeze-out may solve some of the problems (high values of the freeze-out density and specific net charge) that one encounters in the latter case when studying strange particle ratios such as those from the experiment WA85. This underlines the necessity to understand better particle emission in hydrodynamics to be able ...

Positron Emission Tomographic (PET) data is, in general, difficult to segment due to low signal to noise ratio and low resolution. In recent years, however, it has been demonstrated that clustering can be used as an important preprocessing step prior to parametric estimation from dynamic PET data. Here accuracy and efficiency of standard and some novel clustering methods for this dynamic data f...

A major step towards quantitative SPECT imaging may be achieved if attenuation, scatter and blurring effects are accounted for in the reconstruction process. Here we consider an approach which simultaneously estimates the unknown attenuation coefficient and the emission source using the emission data only. This leads to an inverse mathematical problem which could no longer be solved via iterati...

Over the last years many statistical models have been proposed to restore tomographical images. However, their use in medical environment has been limited due to several factors. These factors include the need of greater computational time than deterministic methods and the selection of the hyperparameters of in a given image model. Consequently, deterministic methods, like filtered back-projec...

Second order advantage of excitation-emission fluorescence matrix was applied for the simultaneous determination of ibuprofen and caffeine. The proposed method is based on the measurement of the native fluorescence and recording emission spectra of ibuprofen and caffeine in different excitation wavelengths. The mixture of these compounds was resolved by multivariate curve resolution coupled wit...

In the Persian Gulf region, conditions are highly favorable for ozone air pollution and the region is a hot spot of photochemical smog. The vast activities in processing oil and gas play a major role in it. It was found that the elevated concentrations of reactive hydrocarbons co-emitted with nitrogen oxides from Hydrocarbon Processing facilities lead to substantial ozone production. South Pars...

the main objective of this paper is to study the relationship between the energy consumption (energy use intensity), economic growth, and co2 emission in iran. to that end, we use time series data of iran during 1967–2004. in order to examine the long-run relationship among these variables, the johanson-juselius cointegration method is used along with vecm. the main finding of this study shows ...

In this study, the effects of hydrogen and hydroxygen additions and oxygen enrichment on the emission characteristics of a gasoline engine (EF7) were investigated and compared with each other. The simulation was launched by GT-Power at different engine speeds with 5 % to 15 % volume fractions for both of oxygen and hydrogen enrichment and 4.5 % to 9 % volume fractions of hydroxygen addition in ...