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Abstract

Traditional methods to measure and survey the productivity of oil wells mainly consisted of using test-separator units with expensive instrumental, mechanical, electrical, piping, and safety devices along with technical and protective inspections, repair and operation services, facilities, and infrastructures. Their inherent limitations are time and cost consuming, uncertainty of well isolation in test separator, and need to close the co-line wells, which are diminished using multivariate thermal well testing. In this study, an alternative method is presented using multivariate regression on thermal analysis data. The objective of this study, which covered three distinctive major fields of statistics, thermal analysis, and well testing, is predicting the accurate productivity of oil wells using a single sample point at the blend oil pipeline. This method is based in performing multivariate regression of thermogravimetric data obtained from the samples of Iranian offshore oil wells. The results revealed that the used model appropriate for crude oil blends, which thermal traces significantly differ from each other. The calculated error function corrected the blend equation by considering the eutectic points and catalytic pyrolysis in lower and higher temperatures, respectively. The model predicted the accurate productivity of oil wells in real samples of blend oil pipeline.

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Binding mechanisms of nano-baskets toward alkali metals

Isothermal titration calorimetric study

Journal of Thermal Analysis and Calorimetry
Authors: Bahram Mokhtari and Kobra Pourabdollah

Abstract

Thirty-four nano-basket derivatives of di-ionizable calix[4]arene conformers in nine scaffolds bearing two pendant groups of N-(R)-sulfonyl carboxamides were synthesized and examined using isothermal titration calorimetry. The binding mechanisms of synthesized conformers toward alkali metal cations were evaluated and two main interactions were assessed including cation–π interaction between alkali metal and the aromatic unit of conformer as well as the strong binding ion–dipole interaction between nitrogen atoms in the pendant groups and alkali cation. The ITC data revealed that the bindings of cone and partial-cone conformers toward alkali metal cations exhibited one-step mechanism, while both 1,2 alternate conformer bounds the alkali metal cations in a two-step mechanism.

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Abstract  

Calixarenes has been subject to extensive research in development of many extractants, transporters, stationary phases, electrode ionophores and optical and electrochemical sensors over the past four decades. In this paper, the nuclear applications of calixarenes are summarized in six fields including complexation studies, solvent extraction, membrane transport, chromatography, luminescent and colorimetric applications, and electroanalytical applications. In the first to fourth sections, the extractability, extraction equilibria and extraction constants of lanthanide, actinide and other nuclear waste cations ions, which were subjected to solvent extraction by the macrocyclic ligands, are reviewed. In two last sections, the analytical applications of calixarene complexes towards nuclear waste cations, including spectroscopic and electroanalytic sensors, are discussed. The examples described in this review illustrate the potential of calixarene derivatives in the rapidly growing field of cations recognition in nuclear wastes.

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